aboutsummaryrefslogtreecommitdiff
path: root/ChangeLog
blob: b87449ab69301618994d9fe158978cb2558f8070 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
4852
4853
4854
4855
4856
4857
4858
4859
4860
4861
4862
4863
4864
4865
4866
4867
4868
4869
4870
4871
4872
4873
4874
4875
4876
4877
4878
4879
4880
4881
4882
4883
4884
4885
4886
4887
4888
4889
4890
4891
4892
4893
4894
4895
4896
4897
4898
4899
4900
4901
4902
4903
4904
4905
4906
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927
4928
4929
4930
4931
4932
4933
4934
4935
4936
4937
4938
4939
4940
4941
4942
4943
4944
4945
4946
4947
4948
4949
4950
4951
4952
4953
4954
4955
4956
4957
4958
4959
4960
4961
4962
4963
4964
4965
4966
4967
4968
4969
4970
4971
4972
4973
4974
4975
4976
4977
4978
4979
4980
4981
4982
4983
4984
4985
4986
4987
4988
4989
4990
4991
4992
4993
4994
4995
4996
4997
4998
4999
5000
5001
5002
5003
5004
5005
5006
5007
5008
5009
5010
5011
5012
5013
5014
5015
5016
5017
5018
5019
5020
5021
5022
5023
5024
5025
5026
5027
5028
5029
5030
5031
5032
5033
5034
5035
5036
5037
5038
5039
5040
5041
5042
5043
5044
5045
5046
5047
5048
5049
5050
5051
5052
5053
5054
5055
5056
5057
5058
5059
5060
5061
5062
5063
5064
5065
5066
5067
5068
5069
5070
5071
5072
5073
5074
5075
5076
5077
5078
5079
5080
5081
5082
5083
5084
5085
5086
5087
5088
5089
5090
5091
5092
5093
5094
5095
5096
5097
5098
5099
5100
5101
5102
5103
5104
5105
5106
5107
5108
5109
5110
5111
5112
5113
5114
5115
5116
5117
5118
5119
5120
5121
5122
5123
5124
5125
5126
5127
5128
5129
5130
5131
5132
5133
5134
5135
5136
5137
5138
5139
5140
5141
5142
5143
5144
5145
5146
5147
5148
5149
5150
5151
5152
5153
5154
5155
5156
5157
5158
5159
5160
5161
5162
5163
5164
5165
5166
5167
5168
5169
5170
5171
5172
5173
5174
5175
5176
5177
5178
5179
5180
5181
5182
5183
5184
5185
5186
5187
5188
5189
5190
5191
5192
5193
5194
5195
5196
5197
5198
5199
5200
5201
5202
5203
5204
5205
5206
5207
5208
5209
5210
5211
5212
5213
5214
5215
5216
5217
5218
5219
5220
5221
5222
5223
5224
5225
5226
5227
5228
5229
5230
5231
5232
5233
5234
5235
5236
5237
5238
5239
5240
5241
5242
5243
5244
5245
5246
5247
5248
5249
5250
5251
5252
5253
5254
5255
5256
5257
5258
5259
5260
5261
5262
5263
5264
5265
5266
5267
5268
5269
5270
5271
5272
5273
5274
5275
5276
5277
5278
5279
5280
5281
5282
5283
5284
5285
5286
5287
5288
5289
5290
5291
5292
5293
5294
5295
5296
5297
5298
5299
5300
5301
5302
5303
5304
5305
5306
5307
5308
5309
5310
5311
5312
5313
5314
5315
5316
5317
5318
5319
5320
5321
5322
5323
5324
5325
5326
5327
5328
5329
5330
5331
5332
5333
5334
5335
5336
5337
5338
5339
5340
5341
5342
5343
5344
5345
5346
5347
5348
5349
5350
5351
5352
5353
5354
5355
5356
5357
5358
5359
5360
5361
5362
5363
5364
5365
5366
5367
5368
5369
5370
5371
5372
5373
5374
5375
5376
5377
5378
5379
5380
5381
5382
5383
5384
5385
5386
5387
5388
5389
5390
5391
5392
5393
5394
5395
5396
5397
5398
5399
5400
5401
5402
5403
5404
5405
5406
5407
5408
5409
5410
5411
5412
5413
5414
5415
5416
5417
5418
5419
5420
5421
5422
5423
5424
5425
5426
5427
5428
5429
5430
5431
5432
5433
5434
5435
5436
5437
5438
5439
5440
5441
5442
5443
5444
5445
5446
5447
5448
5449
5450
5451
5452
5453
5454
5455
5456
5457
5458
5459
5460
5461
5462
5463
5464
5465
5466
5467
5468
5469
5470
5471
5472
5473
5474
5475
5476
5477
5478
5479
5480
5481
5482
5483
5484
5485
5486
5487
5488
5489
5490
5491
5492
5493
5494
5495
5496
5497
5498
5499
5500
5501
5502
5503
5504
5505
5506
5507
5508
5509
5510
5511
5512
5513
5514
5515
5516
5517
5518
5519
5520
5521
5522
5523
5524
5525
5526
5527
5528
5529
5530
5531
5532
5533
5534
5535
5536
5537
5538
5539
5540
5541
5542
5543
5544
5545
5546
5547
5548
5549
5550
5551
5552
5553
5554
5555
5556
5557
5558
5559
5560
5561
5562
5563
5564
5565
5566
5567
5568
5569
5570
5571
5572
5573
5574
5575
5576
5577
5578
5579
5580
5581
5582
5583
5584
5585
5586
5587
5588
5589
5590
5591
5592
5593
5594
5595
5596
5597
5598
5599
5600
5601
5602
5603
5604
5605
5606
5607
5608
5609
5610
5611
5612
5613
5614
5615
5616
5617
5618
5619
5620
5621
5622
5623
5624
5625
5626
5627
5628
5629
5630
5631
5632
5633
5634
5635
5636
5637
5638
5639
5640
5641
5642
5643
5644
5645
5646
5647
5648
5649
5650
5651
5652
5653
5654
5655
5656
5657
5658
5659
5660
5661
5662
5663
5664
5665
5666
5667
5668
5669
5670
5671
5672
5673
5674
5675
5676
5677
5678
5679
5680
5681
5682
5683
5684
5685
5686
5687
5688
5689
5690
5691
5692
5693
5694
5695
5696
5697
5698
5699
5700
5701
5702
5703
5704
5705
5706
5707
5708
5709
5710
5711
5712
5713
5714
5715
5716
5717
5718
5719
5720
5721
5722
5723
5724
5725
5726
5727
5728
5729
5730
5731
5732
5733
5734
5735
5736
5737
5738
5739
5740
5741
5742
5743
5744
5745
5746
5747
5748
5749
5750
5751
5752
5753
5754
5755
5756
5757
5758
5759
5760
5761
5762
5763
5764
5765
5766
5767
5768
5769
5770
5771
5772
5773
5774
5775
5776
5777
5778
5779
5780
5781
5782
5783
5784
5785
5786
5787
5788
5789
5790
5791
5792
5793
5794
5795
5796
5797
5798
5799
5800
5801
5802
5803
5804
5805
5806
5807
5808
5809
5810
5811
5812
5813
5814
5815
5816
5817
5818
5819
5820
5821
5822
5823
5824
5825
5826
5827
5828
5829
5830
5831
5832
5833
5834
5835
5836
5837
5838
5839
5840
5841
5842
5843
5844
5845
5846
5847
5848
5849
5850
5851
5852
5853
5854
5855
5856
5857
5858
5859
5860
5861
5862
5863
5864
5865
5866
5867
5868
5869
5870
5871
5872
5873
5874
5875
5876
5877
5878
5879
5880
5881
5882
5883
5884
5885
5886
5887
5888
5889
5890
5891
5892
5893
5894
5895
5896
5897
5898
5899
5900
5901
5902
5903
5904
5905
5906
5907
5908
5909
5910
5911
5912
5913
5914
5915
5916
5917
5918
5919
5920
5921
5922
5923
5924
5925
5926
5927
5928
5929
5930
5931
5932
5933
5934
5935
5936
5937
5938
5939
5940
5941
5942
5943
5944
5945
5946
5947
5948
5949
5950
5951
5952
5953
5954
5955
5956
5957
5958
5959
5960
5961
5962
5963
5964
5965
5966
5967
5968
5969
5970
5971
5972
5973
5974
5975
5976
5977
5978
5979
5980
5981
5982
5983
5984
5985
5986
5987
5988
5989
5990
5991
5992
5993
5994
5995
5996
5997
5998
5999
6000
6001
6002
6003
6004
6005
6006
6007
6008
6009
6010
6011
6012
6013
6014
6015
6016
6017
6018
6019
6020
6021
6022
6023
6024
6025
6026
6027
6028
6029
6030
6031
6032
6033
6034
6035
6036
6037
6038
6039
6040
6041
6042
6043
6044
6045
6046
6047
6048
6049
6050
6051
6052
6053
6054
6055
6056
6057
6058
6059
6060
6061
6062
6063
6064
6065
6066
6067
6068
6069
6070
6071
6072
6073
6074
6075
6076
6077
6078
6079
6080
6081
6082
6083
6084
6085
6086
6087
6088
6089
6090
6091
6092
6093
6094
6095
6096
6097
6098
6099
6100
6101
6102
6103
6104
6105
6106
6107
6108
6109
6110
6111
6112
6113
6114
6115
6116
6117
6118
6119
6120
6121
6122
6123
6124
6125
6126
6127
6128
6129
6130
6131
6132
6133
6134
6135
6136
6137
6138
6139
6140
6141
6142
6143
6144
6145
6146
6147
6148
6149
6150
6151
6152
6153
6154
6155
6156
6157
6158
6159
6160
6161
6162
6163
6164
6165
6166
6167
6168
6169
6170
6171
6172
6173
6174
6175
6176
6177
6178
6179
6180
6181
6182
6183
6184
6185
6186
6187
6188
6189
6190
6191
6192
6193
6194
6195
6196
6197
6198
6199
6200
6201
6202
6203
6204
6205
6206
6207
6208
6209
6210
6211
6212
6213
6214
6215
6216
6217
6218
6219
6220
6221
6222
6223
6224
6225
6226
6227
6228
6229
6230
6231
6232
6233
6234
6235
6236
6237
6238
6239
6240
6241
6242
6243
6244
6245
6246
6247
6248
6249
6250
6251
6252
6253
6254
6255
6256
6257
6258
6259
6260
6261
6262
6263
6264
6265
6266
6267
6268
6269
6270
6271
6272
6273
6274
6275
6276
6277
6278
6279
6280
6281
6282
6283
6284
6285
6286
6287
6288
6289
6290
6291
6292
6293
6294
6295
6296
6297
6298
6299
6300
6301
6302
6303
6304
6305
6306
6307
6308
6309
6310
6311
6312
6313
6314
6315
6316
6317
6318
6319
6320
6321
6322
6323
6324
6325
6326
6327
6328
6329
6330
6331
6332
6333
6334
6335
6336
6337
6338
6339
6340
6341
6342
6343
6344
6345
6346
6347
6348
6349
6350
6351
6352
6353
6354
6355
6356
6357
6358
6359
6360
6361
6362
6363
6364
6365
6366
6367
6368
6369
6370
6371
6372
6373
6374
6375
6376
6377
6378
6379
6380
6381
6382
6383
6384
6385
6386
6387
6388
6389
6390
6391
6392
6393
6394
6395
6396
6397
6398
6399
6400
6401
6402
6403
6404
6405
6406
6407
6408
6409
6410
6411
6412
6413
6414
6415
6416
6417
6418
6419
6420
6421
6422
6423
6424
6425
6426
6427
6428
6429
6430
6431
6432
6433
6434
6435
6436
6437
6438
6439
6440
6441
6442
6443
6444
6445
6446
6447
6448
6449
6450
6451
6452
6453
6454
6455
6456
6457
6458
6459
6460
6461
6462
6463
6464
6465
6466
6467
6468
6469
6470
6471
6472
6473
6474
6475
6476
6477
6478
6479
6480
6481
6482
6483
6484
6485
6486
6487
6488
6489
6490
6491
6492
6493
6494
6495
6496
6497
6498
6499
6500
6501
6502
6503
6504
6505
6506
6507
6508
6509
6510
6511
6512
6513
6514
6515
6516
6517
6518
6519
6520
6521
6522
6523
6524
6525
6526
6527
6528
6529
6530
6531
6532
6533
6534
6535
6536
6537
6538
6539
6540
6541
6542
6543
6544
6545
6546
6547
6548
6549
6550
6551
6552
6553
6554
6555
6556
6557
6558
6559
6560
6561
6562
6563
6564
6565
6566
6567
6568
6569
6570
6571
6572
6573
6574
6575
6576
6577
6578
6579
6580
6581
6582
6583
6584
6585
6586
6587
6588
6589
6590
6591
6592
6593
6594
6595
6596
6597
6598
6599
6600
6601
6602
6603
6604
6605
6606
6607
6608
6609
6610
6611
6612
6613
6614
6615
6616
6617
6618
6619
6620
6621
6622
6623
6624
6625
6626
6627
6628
6629
6630
6631
6632
6633
6634
6635
6636
6637
6638
6639
6640
6641
6642
6643
6644
6645
6646
6647
6648
6649
6650
6651
6652
6653
6654
6655
6656
6657
6658
6659
6660
6661
6662
6663
6664
6665
6666
6667
6668
6669
6670
6671
6672
6673
6674
6675
6676
6677
6678
6679
6680
6681
6682
6683
6684
6685
6686
6687
6688
6689
6690
6691
6692
6693
6694
6695
6696
6697
6698
6699
6700
6701
6702
6703
6704
6705
6706
6707
6708
6709
6710
6711
6712
6713
6714
6715
6716
6717
6718
6719
6720
6721
6722
6723
6724
6725
6726
6727
6728
6729
6730
6731
6732
6733
6734
6735
6736
6737
6738
6739
6740
6741
6742
6743
6744
6745
6746
6747
6748
6749
6750
6751
6752
6753
6754
6755
6756
6757
6758
6759
6760
6761
6762
6763
6764
6765
6766
6767
6768
6769
6770
6771
6772
6773
6774
6775
6776
6777
6778
6779
6780
6781
6782
6783
6784
6785
6786
6787
6788
6789
6790
6791
6792
6793
6794
6795
6796
6797
6798
6799
6800
6801
6802
6803
6804
6805
6806
6807
6808
6809
6810
6811
6812
6813
6814
6815
6816
6817
6818
6819
6820
6821
6822
6823
6824
6825
6826
6827
6828
6829
6830
6831
6832
6833
6834
6835
6836
6837
6838
6839
6840
6841
6842
6843
6844
6845
6846
6847
6848
6849
6850
6851
6852
6853
6854
6855
6856
6857
6858
6859
6860
6861
6862
6863
6864
6865
6866
6867
6868
6869
6870
6871
6872
6873
6874
6875
6876
6877
6878
6879
6880
6881
6882
6883
6884
6885
6886
6887
6888
6889
6890
6891
6892
6893
6894
6895
6896
6897
6898
6899
6900
6901
6902
6903
6904
6905
6906
6907
6908
6909
6910
6911
6912
6913
6914
6915
6916
6917
6918
6919
6920
6921
6922
6923
6924
6925
6926
6927
6928
6929
6930
6931
6932
6933
6934
6935
6936
6937
6938
6939
6940
6941
6942
6943
6944
6945
6946
6947
6948
6949
6950
6951
6952
6953
6954
6955
6956
6957
6958
6959
6960
6961
6962
6963
6964
6965
6966
6967
6968
6969
6970
6971
6972
6973
6974
6975
6976
6977
6978
6979
6980
6981
6982
6983
6984
6985
6986
6987
6988
6989
6990
6991
6992
6993
6994
6995
6996
6997
6998
6999
7000
7001
7002
7003
7004
7005
7006
7007
7008
7009
7010
7011
7012
7013
7014
7015
7016
7017
7018
7019
7020
7021
7022
7023
7024
7025
7026
7027
7028
7029
7030
7031
7032
7033
7034
7035
7036
7037
7038
7039
7040
7041
7042
7043
7044
7045
7046
7047
7048
7049
7050
7051
7052
7053
7054
7055
7056
7057
7058
7059
7060
7061
7062
7063
7064
7065
7066
7067
7068
7069
7070
7071
7072
7073
7074
7075
7076
7077
7078
7079
7080
7081
7082
7083
7084
7085
7086
7087
7088
7089
7090
7091
7092
7093
7094
7095
7096
7097
7098
7099
7100
7101
7102
7103
7104
7105
7106
7107
7108
7109
7110
7111
7112
7113
7114
7115
7116
7117
7118
7119
7120
7121
7122
7123
7124
7125
7126
7127
7128
7129
7130
7131
7132
7133
7134
7135
7136
7137
7138
7139
7140
7141
7142
7143
7144
7145
7146
7147
7148
7149
7150
7151
7152
7153
7154
7155
7156
7157
7158
7159
7160
7161
7162
7163
7164
7165
7166
7167
7168
7169
7170
7171
7172
7173
7174
7175
7176
7177
7178
7179
7180
7181
7182
7183
7184
7185
7186
7187
7188
7189
7190
7191
7192
7193
7194
7195
7196
7197
7198
7199
7200
7201
7202
7203
7204
7205
7206
7207
7208
7209
7210
7211
7212
7213
7214
7215
7216
7217
7218
7219
7220
7221
7222
7223
7224
7225
7226
7227
7228
7229
7230
7231
7232
7233
7234
7235
7236
7237
7238
7239
7240
7241
7242
7243
7244
7245
7246
7247
7248
7249
7250
7251
7252
7253
7254
7255
7256
7257
7258
7259
7260
7261
7262
7263
7264
7265
7266
7267
7268
7269
7270
7271
7272
7273
7274
7275
7276
7277
7278
7279
7280
7281
7282
7283
7284
7285
7286
7287
7288
7289
7290
7291
7292
7293
7294
7295
7296
7297
7298
7299
7300
7301
7302
7303
7304
7305
7306
7307
7308
7309
7310
7311
7312
7313
7314
7315
7316
7317
7318
7319
7320
7321
7322
7323
7324
7325
7326
7327
7328
7329
7330
7331
7332
7333
7334
7335
7336
7337
7338
7339
7340
7341
7342
7343
7344
7345
7346
7347
7348
7349
7350
7351
7352
7353
7354
7355
7356
7357
7358
7359
7360
7361
7362
7363
7364
7365
7366
7367
7368
7369
7370
7371
7372
7373
7374
7375
7376
7377
7378
7379
7380
7381
7382
7383
7384
7385
7386
7387
7388
7389
7390
7391
7392
7393
7394
7395
7396
7397
7398
7399
7400
7401
7402
7403
7404
7405
7406
7407
7408
7409
7410
7411
7412
7413
7414
7415
7416
7417
7418
7419
7420
7421
7422
7423
7424
7425
7426
7427
7428
7429
7430
7431
7432
7433
7434
7435
7436
7437
7438
7439
7440
7441
7442
7443
7444
7445
7446
7447
7448
7449
7450
7451
7452
7453
7454
7455
7456
7457
7458
7459
7460
7461
7462
7463
7464
7465
7466
7467
7468
7469
7470
7471
7472
7473
7474
7475
7476
7477
7478
7479
7480
7481
7482
7483
7484
7485
7486
7487
7488
7489
7490
7491
7492
7493
7494
7495
7496
7497
7498
7499
7500
7501
7502
7503
7504
7505
7506
7507
7508
7509
7510
7511
7512
7513
7514
7515
7516
7517
7518
7519
7520
7521
7522
7523
7524
7525
7526
7527
7528
7529
7530
7531
7532
7533
7534
7535
7536
7537
7538
7539
7540
7541
7542
7543
7544
7545
7546
7547
7548
7549
7550
7551
7552
7553
7554
7555
7556
7557
7558
7559
7560
7561
7562
7563
7564
7565
7566
7567
7568
7569
7570
7571
7572
7573
7574
7575
7576
7577
7578
7579
7580
7581
7582
7583
7584
7585
7586
7587
7588
7589
7590
7591
7592
7593
7594
7595
7596
7597
7598
7599
7600
7601
7602
7603
7604
7605
7606
7607
7608
7609
7610
7611
7612
7613
7614
7615
7616
7617
7618
7619
7620
7621
7622
7623
7624
7625
7626
7627
7628
7629
7630
7631
7632
7633
7634
7635
7636
7637
7638
7639
7640
7641
7642
7643
7644
7645
7646
7647
7648
7649
7650
7651
7652
7653
7654
7655
7656
7657
7658
7659
7660
7661
7662
7663
7664
7665
7666
7667
7668
7669
7670
7671
7672
7673
7674
7675
7676
7677
7678
7679
7680
7681
7682
7683
7684
7685
7686
7687
7688
7689
7690
7691
7692
7693
7694
7695
7696
7697
7698
7699
7700
7701
7702
7703
7704
7705
7706
7707
7708
7709
7710
7711
7712
7713
7714
7715
7716
7717
7718
7719
7720
7721
7722
7723
7724
7725
7726
7727
7728
7729
7730
7731
7732
7733
7734
7735
7736
7737
7738
7739
7740
7741
7742
7743
7744
7745
7746
7747
7748
7749
7750
7751
7752
7753
7754
7755
7756
7757
7758
7759
7760
7761
7762
7763
7764
7765
7766
7767
7768
7769
7770
7771
7772
7773
7774
7775
7776
7777
7778
7779
7780
7781
7782
7783
7784
7785
7786
7787
7788
7789
7790
7791
7792
7793
7794
7795
7796
7797
7798
7799
7800
7801
7802
7803
7804
7805
7806
7807
7808
7809
7810
7811
7812
7813
7814
7815
7816
7817
7818
7819
7820
7821
7822
7823
7824
7825
7826
7827
7828
7829
7830
7831
7832
7833
7834
7835
7836
7837
7838
7839
7840
7841
7842
7843
7844
7845
7846
7847
7848
7849
7850
7851
7852
7853
7854
7855
7856
7857
7858
7859
7860
7861
7862
7863
7864
7865
7866
7867
7868
7869
7870
7871
7872
7873
7874
7875
7876
7877
7878
7879
7880
7881
7882
7883
7884
7885
7886
7887
7888
7889
7890
7891
7892
7893
7894
7895
7896
7897
7898
7899
7900
7901
7902
7903
7904
7905
7906
7907
7908
7909
7910
7911
7912
7913
7914
7915
7916
7917
7918
7919
7920
7921
7922
7923
7924
7925
7926
7927
7928
7929
7930
7931
7932
7933
7934
7935
7936
7937
7938
7939
7940
7941
7942
7943
7944
7945
7946
7947
7948
7949
7950
7951
7952
7953
7954
7955
7956
7957
7958
7959
7960
7961
7962
7963
7964
7965
7966
7967
7968
7969
7970
7971
7972
7973
7974
7975
7976
7977
7978
7979
7980
7981
7982
7983
7984
7985
7986
7987
7988
7989
7990
7991
7992
7993
7994
7995
7996
7997
7998
7999
8000
8001
8002
8003
8004
8005
8006
8007
8008
8009
8010
8011
8012
8013
8014
8015
8016
8017
8018
8019
8020
8021
8022
8023
8024
8025
8026
8027
8028
8029
8030
8031
8032
8033
8034
8035
8036
8037
8038
8039
8040
8041
8042
8043
8044
8045
8046
8047
8048
8049
8050
8051
8052
8053
8054
8055
8056
8057
8058
8059
8060
8061
8062
8063
8064
8065
8066
8067
8068
8069
8070
8071
8072
8073
8074
8075
8076
8077
8078
8079
8080
8081
8082
8083
8084
8085
8086
8087
8088
8089
8090
8091
8092
8093
8094
8095
8096
8097
8098
8099
8100
8101
8102
8103
8104
8105
8106
8107
8108
8109
8110
8111
8112
8113
8114
8115
8116
8117
8118
8119
8120
8121
8122
8123
8124
8125
8126
8127
8128
8129
8130
8131
8132
8133
8134
8135
8136
8137
8138
8139
8140
8141
8142
8143
8144
8145
8146
8147
8148
8149
8150
8151
8152
8153
8154
8155
8156
8157
8158
8159
8160
8161
8162
8163
8164
8165
8166
8167
8168
8169
8170
8171
8172
8173
8174
8175
8176
8177
8178
8179
8180
8181
8182
8183
8184
8185
8186
8187
8188
8189
8190
8191
8192
8193
8194
8195
8196
8197
8198
8199
8200
8201
8202
8203
8204
8205
8206
8207
8208
8209
8210
8211
8212
8213
8214
8215
8216
8217
8218
8219
8220
8221
8222
8223
8224
8225
8226
8227
8228
8229
8230
8231
8232
8233
8234
8235
8236
8237
8238
8239
8240
8241
8242
8243
8244
8245
8246
8247
8248
8249
8250
8251
8252
8253
8254
8255
8256
8257
8258
8259
8260
8261
8262
8263
8264
8265
8266
8267
8268
8269
8270
8271
8272
8273
8274
8275
8276
8277
8278
8279
8280
8281
8282
8283
8284
8285
8286
8287
8288
8289
8290
8291
8292
8293
8294
8295
8296
8297
8298
8299
8300
8301
8302
8303
8304
8305
8306
8307
8308
8309
8310
8311
8312
8313
8314
8315
8316
8317
8318
8319
8320
8321
8322
8323
8324
8325
8326
8327
8328
8329
8330
8331
8332
8333
8334
8335
8336
8337
8338
8339
8340
8341
8342
8343
8344
8345
8346
8347
8348
8349
8350
8351
8352
8353
8354
8355
8356
8357
8358
8359
8360
8361
8362
8363
8364
8365
8366
8367
8368
8369
8370
8371
8372
8373
8374
8375
8376
8377
8378
8379
8380
8381
8382
8383
8384
8385
8386
8387
8388
8389
8390
8391
8392
8393
8394
8395
8396
8397
8398
8399
8400
8401
8402
8403
8404
8405
8406
8407
8408
8409
8410
8411
8412
8413
8414
8415
8416
8417
8418
8419
8420
8421
8422
8423
8424
8425
8426
8427
8428
8429
8430
8431
8432
8433
8434
8435
8436
8437
8438
8439
8440
8441
8442
8443
8444
8445
8446
8447
8448
8449
8450
8451
8452
8453
8454
8455
8456
8457
8458
8459
8460
8461
8462
8463
8464
8465
8466
8467
8468
8469
8470
8471
8472
8473
8474
8475
8476
8477
8478
8479
8480
8481
8482
8483
8484
8485
8486
8487
8488
8489
8490
8491
8492
8493
8494
8495
8496
8497
8498
8499
8500
8501
8502
8503
8504
8505
8506
8507
8508
8509
8510
8511
8512
8513
8514
8515
8516
8517
8518
8519
8520
8521
8522
8523
8524
8525
8526
8527
8528
8529
8530
8531
8532
8533
8534
8535
8536
8537
8538
8539
8540
8541
8542
8543
8544
8545
8546
8547
8548
8549
8550
8551
8552
8553
8554
8555
8556
8557
8558
8559
8560
8561
8562
8563
8564
8565
8566
8567
8568
8569
8570
8571
8572
8573
8574
8575
8576
8577
8578
8579
8580
8581
8582
8583
8584
8585
8586
8587
8588
8589
8590
8591
8592
8593
8594
8595
8596
8597
8598
8599
8600
8601
8602
8603
8604
8605
8606
8607
8608
8609
8610
8611
8612
8613
8614
8615
8616
8617
8618
8619
8620
8621
8622
8623
8624
8625
8626
8627
8628
8629
8630
8631
8632
8633
8634
8635
8636
8637
8638
8639
8640
8641
8642
8643
8644
8645
8646
8647
8648
8649
8650
8651
8652
8653
8654
8655
8656
8657
8658
8659
8660
8661
8662
8663
8664
8665
8666
8667
8668
8669
8670
8671
8672
8673
8674
8675
8676
8677
8678
8679
8680
8681
8682
8683
8684
8685
8686
8687
8688
8689
8690
8691
8692
8693
8694
8695
8696
8697
8698
8699
8700
8701
8702
8703
8704
8705
8706
8707
8708
8709
8710
8711
8712
8713
8714
8715
8716
8717
8718
8719
8720
8721
8722
8723
8724
8725
8726
8727
8728
8729
8730
8731
8732
8733
8734
8735
8736
8737
8738
8739
8740
8741
8742
8743
8744
8745
8746
8747
8748
8749
8750
8751
8752
8753
8754
8755
8756
8757
8758
8759
8760
8761
8762
8763
8764
8765
8766
8767
8768
8769
8770
8771
8772
8773
8774
8775
8776
8777
8778
8779
8780
8781
8782
8783
8784
8785
8786
8787
8788
8789
8790
8791
8792
8793
8794
8795
8796
8797
8798
8799
8800
8801
8802
8803
8804
8805
8806
8807
8808
8809
8810
8811
8812
8813
8814
8815
8816
8817
8818
8819
8820
8821
8822
8823
8824
8825
8826
8827
8828
8829
8830
8831
8832
8833
8834
8835
8836
8837
8838
8839
8840
8841
8842
8843
8844
8845
8846
8847
8848
8849
8850
8851
8852
8853
8854
8855
8856
8857
8858
8859
8860
8861
8862
8863
8864
8865
8866
8867
8868
8869
8870
8871
8872
8873
8874
8875
8876
8877
8878
8879
8880
8881
8882
8883
8884
8885
8886
8887
8888
8889
8890
8891
8892
8893
8894
8895
8896
8897
8898
8899
8900
8901
8902
8903
8904
8905
8906
8907
8908
8909
8910
8911
8912
8913
8914
8915
8916
8917
8918
8919
8920
8921
8922
8923
8924
8925
8926
8927
8928
8929
8930
8931
8932
8933
8934
8935
8936
8937
8938
8939
8940
8941
8942
8943
8944
8945
8946
8947
8948
8949
8950
8951
8952
8953
8954
8955
8956
8957
8958
8959
8960
8961
8962
8963
8964
8965
8966
8967
8968
8969
8970
8971
8972
8973
8974
8975
8976
8977
8978
8979
8980
8981
8982
8983
8984
8985
8986
8987
8988
8989
8990
8991
8992
8993
8994
8995
8996
8997
8998
8999
9000
9001
9002
9003
9004
9005
9006
9007
9008
9009
9010
9011
9012
9013
9014
9015
9016
9017
9018
9019
9020
9021
9022
9023
9024
9025
9026
9027
9028
9029
9030
9031
9032
9033
9034
9035
9036
9037
9038
9039
9040
9041
9042
9043
9044
9045
9046
9047
9048
9049
9050
9051
9052
9053
9054
9055
9056
9057
9058
9059
9060
9061
9062
9063
9064
9065
9066
9067
9068
9069
9070
9071
9072
9073
9074
9075
9076
9077
9078
9079
9080
9081
9082
9083
9084
9085
9086
9087
9088
9089
9090
9091
9092
9093
9094
9095
9096
9097
9098
9099
9100
9101
9102
9103
9104
9105
9106
9107
9108
9109
9110
9111
9112
9113
9114
9115
9116
9117
9118
9119
9120
9121
9122
9123
9124
9125
9126
9127
9128
9129
9130
9131
9132
9133
9134
9135
9136
9137
9138
9139
9140
9141
9142
9143
9144
9145
9146
9147
9148
9149
9150
9151
9152
9153
9154
9155
9156
9157
9158
9159
9160
9161
9162
9163
9164
9165
9166
9167
9168
9169
9170
9171
9172
9173
9174
9175
9176
9177
9178
9179
9180
9181
9182
9183
9184
9185
9186
9187
9188
9189
9190
9191
9192
9193
9194
9195
9196
9197
9198
9199
9200
9201
9202
9203
9204
9205
9206
9207
9208
9209
9210
9211
9212
9213
9214
9215
9216
9217
9218
9219
9220
9221
9222
9223
9224
9225
9226
9227
9228
9229
9230
9231
9232
9233
9234
9235
9236
9237
9238
9239
9240
9241
9242
9243
9244
9245
9246
9247
9248
9249
9250
9251
9252
9253
9254
9255
9256
9257
9258
9259
9260
9261
9262
9263
9264
9265
9266
9267
9268
9269
9270
9271
9272
9273
9274
9275
9276
9277
9278
9279
9280
9281
9282
9283
9284
9285
9286
9287
9288
9289
9290
9291
9292
9293
9294
9295
9296
9297
9298
9299
9300
9301
9302
9303
9304
9305
9306
9307
9308
9309
9310
9311
9312
9313
9314
9315
9316
9317
9318
9319
9320
9321
9322
9323
9324
9325
9326
9327
9328
9329
9330
9331
9332
9333
9334
9335
9336
9337
9338
9339
9340
9341
9342
9343
9344
9345
9346
9347
9348
9349
9350
9351
9352
9353
9354
9355
9356
9357
9358
9359
9360
9361
9362
9363
9364
9365
9366
9367
9368
9369
9370
9371
9372
9373
9374
9375
9376
9377
9378
9379
9380
9381
9382
9383
9384
9385
9386
9387
9388
9389
9390
9391
9392
9393
9394
9395
9396
9397
9398
9399
9400
9401
9402
9403
9404
9405
9406
9407
9408
9409
9410
9411
9412
9413
9414
9415
9416
9417
9418
9419
9420
9421
9422
9423
9424
9425
9426
9427
9428
9429
9430
9431
9432
9433
9434
9435
9436
9437
9438
9439
9440
9441
9442
9443
9444
9445
9446
9447
9448
9449
9450
9451
9452
9453
9454
9455
9456
9457
9458
9459
9460
9461
9462
9463
9464
9465
9466
9467
9468
9469
9470
9471
9472
9473
9474
9475
9476
9477
9478
9479
9480
9481
9482
9483
9484
9485
9486
9487
9488
9489
9490
9491
9492
9493
9494
9495
9496
9497
9498
9499
9500
9501
9502
9503
9504
9505
9506
9507
9508
9509
9510
9511
9512
9513
9514
9515
9516
9517
9518
9519
9520
9521
9522
9523
9524
9525
9526
9527
9528
9529
9530
9531
9532
9533
9534
9535
9536
9537
9538
9539
9540
9541
9542
9543
9544
9545
9546
9547
9548
9549
9550
9551
9552
9553
9554
9555
9556
9557
9558
9559
9560
9561
9562
9563
9564
9565
9566
9567
9568
9569
9570
9571
9572
9573
9574
9575
9576
9577
9578
9579
9580
9581
9582
9583
9584
9585
9586
9587
9588
9589
9590
9591
9592
9593
9594
9595
9596
9597
9598
9599
9600
9601
9602
9603
9604
9605
9606
9607
9608
9609
9610
9611
9612
9613
9614
9615
9616
9617
9618
9619
9620
9621
9622
9623
9624
9625
9626
9627
9628
9629
9630
9631
9632
9633
9634
9635
9636
9637
9638
9639
9640
9641
9642
9643
9644
9645
9646
9647
9648
9649
9650
9651
9652
9653
9654
9655
9656
9657
9658
9659
9660
9661
9662
9663
9664
Changes in version 0.2.2.19-alpha - 2010-11-22
  Yet another OpenSSL security patch broke its compatibility with Tor:
  Tor 0.2.2.19-alpha makes relays work with OpenSSL 0.9.8p and 1.0.0.b.

  o Major bugfixes:
    - Resolve an incompatibility with OpenSSL 0.9.8p and OpenSSL 1.0.0b:
      No longer set the tlsext_host_name extension on server SSL objects;
      but continue to set it on client SSL objects. Our goal in setting
      it was to imitate a browser, not a vhosting server. Fixes bug 2204;
      bugfix on 0.2.1.1-alpha.

  o Minor bugfixes:
    - Try harder not to exceed the maximum length of 50 KB when writing
      statistics to extra-info descriptors. This bug was triggered by very
      fast relays reporting exit-port, entry, and dirreq statistics.
      Reported by Olaf Selke. Bugfix on 0.2.2.1-alpha. Fixes bug 2183.
    - Publish a router descriptor even if generating an extra-info
      descriptor fails. Previously we would not publish a router
      descriptor without an extra-info descriptor; this can cause fast
      exit relays collecting exit-port statistics to drop from the
      consensus. Bugfix on 0.1.2.9-rc; fixes bug 2195.


Changes in version 0.2.2.18-alpha - 2010-11-16
  Tor 0.2.2.18-alpha fixes several crash bugs that have been nagging
  us lately, makes unpublished bridge relays able to detect their IP
  address, and fixes a wide variety of other bugs to get us much closer
  to a stable release.

  o Major bugfixes:
    - Do even more to reject (and not just ignore) annotations on
      router descriptors received anywhere but from the cache. Previously
      we would ignore such annotations at first, but cache them to disk
      anyway. Bugfix on 0.2.0.8-alpha. Found by piebeer.
    - Do not log messages to the controller while shrinking buffer
      freelists. Doing so would sometimes make the controller connection
      try to allocate a buffer chunk, which would mess up the internals
      of the freelist and cause an assertion failure. Fixes bug 1125;
      fixed by Robert Ransom. Bugfix on 0.2.0.16-alpha.
    - Learn our external IP address when we're a relay or bridge, even if
      we set PublishServerDescriptor to 0. Bugfix on 0.2.0.3-alpha,
      where we introduced bridge relays that don't need to publish to
      be useful. Fixes bug 2050.
    - Maintain separate TLS contexts and certificates for incoming and
      outgoing connections in bridge relays. Previously we would use the
      same TLS contexts and certs for incoming and outgoing connections.
      Bugfix on 0.2.0.3-alpha; addresses bug 988.
    - Maintain separate identity keys for incoming and outgoing TLS
      contexts in bridge relays. Previously we would use the same
      identity keys for incoming and outgoing TLS contexts. Bugfix on
      0.2.0.3-alpha; addresses the other half of bug 988.
    - Avoid an assertion failure when we as an authority receive a
      duplicate upload of a router descriptor that we already have,
      but which we previously considered an obsolete descriptor.
      Fixes another case of bug 1776. Bugfix on 0.2.2.16-alpha.
    - Avoid a crash bug triggered by looking at a dangling pointer while
      setting the network status consensus. Found by Robert Ransom.
      Bugfix on 0.2.2.17-alpha. Fixes bug 2097.
    - Fix a logic error where servers that _didn't_ act as exits would
      try to keep their server lists more aggressively up to date than
      exits, when it was supposed to be the other way around. Bugfix
      on 0.2.2.17-alpha.

  o Minor bugfixes (on Tor 0.2.1.x and earlier):
    - When we're trying to guess whether we know our IP address as
      a relay, we would log various ways that we failed to guess
      our address, but never log that we ended up guessing it
      successfully. Now add a log line to help confused and anxious
      relay operators. Bugfix on 0.1.2.1-alpha; fixes bug 1534.
    - Bring the logic that gathers routerinfos and assesses the
      acceptability of circuits into line. This prevents a Tor OP from
      getting locked in a cycle of choosing its local OR as an exit for a
      path (due to a .exit request) and then rejecting the circuit because
      its OR is not listed yet. It also prevents Tor clients from using an
      OR running in the same instance as an exit (due to a .exit request)
      if the OR does not meet the same requirements expected of an OR
      running elsewhere. Fixes bug 1859; bugfix on 0.1.0.1-rc.
    - Correctly describe errors that occur when generating a TLS object.
      Previously we would attribute them to a failure while generating a
      TLS context. Patch by Robert Ransom. Bugfix on 0.1.0.4-rc; fixes
      bug 1994.
    - Enforce multiplicity rules when parsing annotations. Bugfix on
      0.2.0.8-alpha. Found by piebeer.
    - Fix warnings that newer versions of autoconf produced during
      ./autogen.sh. These warnings appear to be harmless in our case,
      but they were extremely verbose. Fixes bug 2020.

  o Minor bugfixes (on Tor 0.2.2.x):
    - Enable protection of small arrays whenever we build with gcc
      hardening features, not only when also building with warnings
      enabled. Fixes bug 2031; bugfix on 0.2.2.14-alpha. Reported by keb.

  o Minor features:
    - Make hidden services work better in private Tor networks by not
      requiring any uptime to join the hidden service descriptor
      DHT. Implements ticket 2088.
    - Rate-limit the "your application is giving Tor only an IP address"
      warning. Addresses bug 2000; bugfix on 0.0.8pre2.
    - When AllowSingleHopExits is set, print a warning to explain to the
      relay operator why most clients are avoiding her relay.
    - Update to the November 1 2010 Maxmind GeoLite Country database.

  o Code simplifications and refactoring:
    - When we fixed bug 1038 we had to put in a restriction not to send
      RELAY_EARLY cells on rend circuits. This was necessary as long
      as relays using Tor 0.2.1.3-alpha through 0.2.1.18-alpha were
      active. Now remove this obsolete check. Resolves bug 2081.
    - Some options used different conventions for uppercasing of acronyms
      when comparing manpage and source. Fix those in favor of the
      manpage, as it makes sense to capitalize acronyms.
    - Remove the torrc.complete file. It hasn't been kept up to date
      and users will have better luck checking out the manpage.
    - Remove the obsolete "NoPublish" option; it has been flagged
      as obsolete and has produced a warning since 0.1.1.18-rc.
    - Remove everything related to building the expert bundle for OS X.
      It has confused many users, doesn't work right on OS X 10.6,
      and is hard to get rid of once installed. Resolves bug 1274.


Changes in version 0.2.2.17-alpha - 2010-09-30
  Tor 0.2.2.17-alpha introduces a feature to make it harder for clients
  to use one-hop circuits (which can put the exit relays at higher risk,
  plus unbalance the network); fixes a big bug in bandwidth accounting
  for relays that want to limit their monthly bandwidth use; fixes a
  big pile of bugs in how clients tolerate temporary network failure;
  and makes our adaptive circuit build timeout feature (which improves
  client performance if your network is fast while not breaking things
  if your network is slow) better handle bad networks.

  o Major features:
    - Exit relays now try harder to block exit attempts from unknown
      relays, to make it harder for people to use them as one-hop proxies
      a la tortunnel. Controlled by the refuseunknownexits consensus
      parameter (currently enabled), or you can override it on your
      relay with the RefuseUnknownExits torrc option. Resolves bug 1751.

  o Major bugfixes (0.2.1.x and earlier):
    - Fix a bug in bandwidth accounting that could make us use twice
      the intended bandwidth when our interval start changes due to
      daylight saving time. Now we tolerate skew in stored vs computed
      interval starts: if the start of the period changes by no more than
      50% of the period's duration, we remember bytes that we transferred
      in the old period. Fixes bug 1511; bugfix on 0.0.9pre5.
    - Always search the Windows system directory for system DLLs, and
      nowhere else. Bugfix on 0.1.1.23; fixes bug 1954.
    - When you're using bridges and your network goes away and your
      bridges get marked as down, recover when you attempt a new socks
      connection (if the network is back), rather than waiting up to an
      hour to try fetching new descriptors for your bridges. Bugfix on
      0.2.0.3-alpha; fixes bug 1981.

  o Major bugfixes (on 0.2.2.x):
    - Fix compilation on Windows. Bugfix on 0.2.2.16-alpha; related to
      bug 1797.
    - Fix a segfault that could happen when operating a bridge relay with
      no GeoIP database set. Fixes bug 1964; bugfix on 0.2.2.15-alpha.
    - The consensus bandwidth-weights (used by clients to choose fast
      relays) entered an unexpected edge case in September where
      Exits were much scarcer than Guards, resulting in bad weight
      recommendations. Now we compute them using new constraints that
      should succeed in all cases. Also alter directory authorities to
      not include the bandwidth-weights line if they fail to produce
      valid values. Fixes bug 1952; bugfix on 0.2.2.10-alpha.
    - When weighting bridges during path selection, we used to trust
      the bandwidths they provided in their descriptor, only capping them
      at 10MB/s. This turned out to be problematic for two reasons:
      Bridges could claim to handle a lot more traffic then they
      actually would, thus making more clients pick them and have a
      pretty effective DoS attack. The other issue is that new bridges
      that might not have a good estimate for their bw capacity yet
      would not get used at all unless no other bridges are available
      to a client. Fixes bug 1912; bugfix on 0.2.2.7-alpha.

  o Major bugfixes (on the circuit build timeout feature, 0.2.2.x):
    - Ignore cannibalized circuits when recording circuit build times.
      This should provide for a minor performance improvement for hidden
      service users using 0.2.2.14-alpha, and should remove two spurious
      notice log messages. Bugfix on 0.2.2.14-alpha; fixes bug 1740.
    - Simplify the logic that causes us to decide if the network is
      unavailable for purposes of recording circuit build times. If we
      receive no cells whatsoever for the entire duration of a circuit's
      full measured lifetime, the network is probably down. Also ignore
      one-hop directory fetching circuit timeouts when calculating our
      circuit build times. These changes should hopefully reduce the
      cases where we see ridiculous circuit build timeouts for people
      with spotty wireless connections. Fixes part of bug 1772; bugfix
      on 0.2.2.2-alpha.
    - Prevent the circuit build timeout from becoming larger than
      the maximum build time we have ever seen. Also, prevent the time
      period for measurement circuits from becoming larger than twice that
      value. Fixes the other part of bug 1772; bugfix on 0.2.2.2-alpha.

  o Minor features:
    - When we run out of directory information such that we can't build
      circuits, but then get enough that we can build circuits, log when
      we actually construct a circuit, so the user has a better chance of
      knowing what's going on. Fixes bug 1362.
    - Be more generous with how much bandwidth we'd use up (with
      accounting enabled) before entering "soft hibernation". Previously,
      we'd refuse new connections and circuits once we'd used up 95% of
      our allotment. Now, we use up 95% of our allotment, AND make sure
      that we have no more than 500MB (or 3 hours of expected traffic,
      whichever is lower) remaining before we enter soft hibernation.
    - If we've configured EntryNodes and our network goes away and/or all
      our entrynodes get marked down, optimistically retry them all when
      a new socks application request appears. Fixes bug 1882.
    - Add some more defensive programming for architectures that can't
      handle unaligned integer accesses. We don't know of any actual bugs
      right now, but that's the best time to fix them. Fixes bug 1943.
    - Support line continuations in the torrc config file. If a line
      ends with a single backslash character, the newline is ignored, and
      the configuration value is treated as continuing on the next line.
      Resolves bug 1929.

  o Minor bugfixes (on 0.2.1.x and earlier):
    - For bandwidth accounting, calculate our expected bandwidth rate
      based on the time during which we were active and not in
      soft-hibernation during the last interval. Previously, we were
      also considering the time spent in soft-hibernation. If this
      was a long time, we would wind up underestimating our bandwidth
      by a lot, and skewing our wakeup time towards the start of the
      accounting interval. Fixes bug 1789. Bugfix on 0.0.9pre5.

  o Minor bugfixes (on 0.2.2.x):
    - Resume generating CIRC FAILED REASON=TIMEOUT control port messages,
      which were disabled by the circuit build timeout changes in
      0.2.2.14-alpha. Bugfix on 0.2.2.14-alpha; fixes bug 1739.
    - Make sure we don't warn about missing bandwidth weights when
      choosing bridges or other relays not in the consensus. Bugfix on
      0.2.2.10-alpha; fixes bug 1805.
    - In our logs, do not double-report signatures from unrecognized
      authorities both as "from unknown authority" and "not
      present". Fixes bug 1956, bugfix on 0.2.2.16-alpha.


Changes in version 0.2.2.16-alpha - 2010-09-17
  Tor 0.2.2.16-alpha fixes a variety of old stream fairness bugs (most
  evident at exit relays), and also continues to resolve all the little
  bugs that have been filling up trac lately.

  o Major bugfixes (stream-level fairness):
    - When receiving a circuit-level SENDME for a blocked circuit, try
      to package cells fairly from all the streams that had previously
      been blocked on that circuit. Previously, we had started with the
      oldest stream, and allowed each stream to potentially exhaust
      the circuit's package window. This gave older streams on any
      given circuit priority over newer ones. Fixes bug 1937. Detected
      originally by Camilo Viecco. This bug was introduced before the
      first Tor release, in svn commit r152: it is the new winner of
      the longest-lived bug prize.
    - When the exit relay got a circuit-level sendme cell, it started
      reading on the exit streams, even if had 500 cells queued in the
      circuit queue already, so the circuit queue just grew and grew in
      some cases. We fix this by not re-enabling reading on receipt of a
      sendme cell when the cell queue is blocked. Fixes bug 1653. Bugfix
      on 0.2.0.1-alpha. Detected by Mashael AlSabah. Original patch by
      "yetonetime".
    - Newly created streams were allowed to read cells onto circuits,
      even if the circuit's cell queue was blocked and waiting to drain.
      This created potential unfairness, as older streams would be
      blocked, but newer streams would gladly fill the queue completely.
      We add code to detect this situation and prevent any stream from
      getting more than one free cell. Bugfix on 0.2.0.1-alpha. Partially
      fixes bug 1298.

  o Minor features:
    - Update to the September 1 2010 Maxmind GeoLite Country database.
    - Warn when CookieAuthFileGroupReadable is set but CookieAuthFile is
      not. This would lead to a cookie that is still not group readable.
      Closes bug 1843. Suggested by katmagic.
    - When logging a rate-limited warning, we now mention how many messages
      got suppressed since the last warning.
    - Add new "perconnbwrate" and "perconnbwburst" consensus params to
      do individual connection-level rate limiting of clients. The torrc
      config options with the same names trump the consensus params, if
      both are present. Replaces the old "bwconnrate" and "bwconnburst"
      consensus params which were broken from 0.2.2.7-alpha through
      0.2.2.14-alpha. Closes bug 1947.
    - When a router changes IP address or port, authorities now launch
      a new reachability test for it. Implements ticket 1899.
    - Make the formerly ugly "2 unknown, 7 missing key, 0 good, 0 bad,
      2 no signature, 4 required" messages about consensus signatures
      easier to read, and make sure they get logged at the same severity
      as the messages explaining which keys are which. Fixes bug 1290.
    - Don't warn when we have a consensus that we can't verify because
      of missing certificates, unless those certificates are ones
      that we have been trying and failing to download. Fixes bug 1145.
    - If you configure your bridge with a known identity fingerprint,
      and the bridge authority is unreachable (as it is in at least
      one country now), fall back to directly requesting the descriptor
      from the bridge. Finishes the feature started in 0.2.0.10-alpha;
      closes bug 1138.
    - When building with --enable-gcc-warnings on OpenBSD, disable
      warnings in system headers. This makes --enable-gcc-warnings
      pass on OpenBSD 4.8.

  o Minor bugfixes (on 0.2.1.x and earlier):
    - Authorities will now attempt to download consensuses if their
      own efforts to make a live consensus have failed. This change
      means authorities that restart will fetch a valid consensus, and
      it means authorities that didn't agree with the current consensus
      will still fetch and serve it if it has enough signatures. Bugfix
      on 0.2.0.9-alpha; fixes bug 1300.
    - Ensure DNS requests launched by "RESOLVE" commands from the
      controller respect the __LeaveStreamsUnattached setconf options. The
      same goes for requests launched via DNSPort or transparent
      proxying. Bugfix on 0.2.0.1-alpha; fixes bug 1525.
    - Allow handshaking OR connections to take a full KeepalivePeriod
      seconds to handshake. Previously, we would close them after
      IDLE_OR_CONN_TIMEOUT (180) seconds, the same timeout as if they
      were open. Bugfix on 0.2.1.26; fixes bug 1840. Thanks to mingw-san
      for analysis help.
    - Rate-limit "Failed to hand off onionskin" warnings.
    - Never relay a cell for a circuit we have already destroyed.
      Between marking a circuit as closeable and finally closing it,
      it may have been possible for a few queued cells to get relayed,
      even though they would have been immediately dropped by the next
      OR in the circuit. Fixes bug 1184; bugfix on 0.2.0.1-alpha.
    - Never queue a cell for a circuit that's already been marked
      for close.
    - Never vote for a server as "Running" if we have a descriptor for
      it claiming to be hibernating, and that descriptor was published
      more recently than our last contact with the server. Bugfix on
      0.2.0.3-alpha; fixes bug 911.
    - Squash a compile warning on OpenBSD. Reported by Tas; fixes
      bug 1848.

  o Minor bugfixes (on 0.2.2.x):
    - Fix a regression introduced in 0.2.2.7-alpha that marked relays
      down if a directory fetch fails and you've configured either
      bridges or EntryNodes. The intent was to mark the relay as down
      _unless_ you're using bridges or EntryNodes, since if you are
      then you could quickly run out of entry points.
    - Fix the Windows directory-listing code. A bug introduced in
      0.2.2.14-alpha could make Windows directory servers forget to load
      some of their cached v2 networkstatus files.
    - Really allow clients to use relays as bridges. Fixes bug 1776;
      bugfix on 0.2.2.15-alpha.
    - Demote a warn to info that happens when the CellStatistics option
      was just enabled. Bugfix on 0.2.2.15-alpha; fixes bug 1921.
      Reported by Moritz Bartl.
    - On Windows, build correctly either with or without Unicode support.
      This is necessary so that Tor can support fringe platforms like
      Windows 98 (which has no Unicode), or Windows CE (which has no
      non-Unicode). Bugfix on 0.2.2.14-alpha; fixes bug 1797.

  o Testing
    - Add a unit test for cross-platform directory-listing code.


Changes in version 0.2.2.15-alpha - 2010-08-18
  Tor 0.2.2.15-alpha fixes a big bug in hidden service availability,
  fixes a variety of other bugs that were preventing performance
  experiments from moving forward, fixes several bothersome memory leaks,
  and generally closes a lot of smaller bugs that have been filling up
  trac lately.

  o Major bugfixes:
    - Stop assigning the HSDir flag to relays that disable their
      DirPort (and thus will refuse to answer directory requests). This
      fix should dramatically improve the reachability of hidden services:
      hidden services and hidden service clients pick six HSDir relays
      to store and retrieve the hidden service descriptor, and currently
      about half of the HSDir relays will refuse to work. Bugfix on
      0.2.0.10-alpha; fixes part of bug 1693.
    - The PerConnBWRate and Burst config options, along with the
      bwconnrate and bwconnburst consensus params, initialized each conn's
      token bucket values only when the connection is established. Now we
      update them if the config options change, and update them every time
      we get a new consensus. Otherwise we can encounter an ugly edge
      case where we initialize an OR conn to client-level bandwidth,
      but then later the relay joins the consensus and we leave it
      throttled. Bugfix on 0.2.2.7-alpha; fixes bug 1830.
    - Fix a regression that caused Tor to rebind its ports if it receives
      SIGHUP while hibernating. Bugfix in 0.1.1.6-alpha; closes bug 919.

  o Major features:
    - Lower the maximum weighted-fractional-uptime cutoff to 98%. This
      should give us approximately 40-50% more Guard-flagged nodes,
      improving the anonymity the Tor network can provide and also
      decreasing the dropoff in throughput that relays experience when
      they first get the Guard flag.
    - Allow enabling or disabling the *Statistics config options while
      Tor is running.

  o Minor features:
    - Update to the August 1 2010 Maxmind GeoLite Country database.
    - Have the controller interface give a more useful message than
      "Internal Error" in response to failed GETINFO requests.
    - Warn when the same option is provided more than once in a torrc
      file, on the command line, or in a single SETCONF statement, and
      the option is one that only accepts a single line. Closes bug 1384.
    - Build correctly on mingw with more recent versions of OpenSSL 0.9.8.
      Patch from mingw-san.
    - Add support for the country code "{??}" in torrc options like
      ExcludeNodes, to indicate all routers of unknown country. Closes
      bug 1094.
    - Relays report the number of bytes spent on answering directory
      requests in extra-info descriptors similar to {read,write}-history.
      Implements enhancement 1790.

  o Minor bugfixes (on 0.2.1.x and earlier):
    - Complain if PublishServerDescriptor is given multiple arguments that
      include 0 or 1. This configuration will be rejected in the future.
      Bugfix on 0.2.0.1-alpha; closes bug 1107.
    - Disallow BridgeRelay 1 and ORPort 0 at once in the configuration.
      Bugfix on 0.2.0.13-alpha; closes bug 928.
    - Change "Application request when we're believed to be offline."
      notice to "Application request when we haven't used client
      functionality lately.", to clarify that it's not an error. Bugfix
      on 0.0.9.3; fixes bug 1222.
    - Fix a bug in the controller interface where "GETINFO ns/asdaskljkl"
      would return "551 Internal error" rather than "552 Unrecognized key
      ns/asdaskljkl". Bugfix on 0.1.2.3-alpha.
    - Users can't configure a regular relay to be their bridge. It didn't
      work because when Tor fetched the bridge descriptor, it found
      that it already had it, and didn't realize that the purpose of the
      descriptor had changed. Now we replace routers with a purpose other
      than bridge with bridge descriptors when fetching them. Bugfix on
      0.1.1.9-alpha. Bug 1776 not yet fixed because now we immediately
      refetch the descriptor with router purpose 'general', disabling
      it as a bridge.
    - Fix a rare bug in rend_fn unit tests: we would fail a test when
      a randomly generated port is 0. Diagnosed by Matt Edman. Bugfix
      on 0.2.0.10-alpha; fixes bug 1808.
    - Exit nodes didn't recognize EHOSTUNREACH as a plausible error code,
      and so sent back END_STREAM_REASON_MISC. Clients now recognize a new
      stream ending reason for this case: END_STREAM_REASON_NOROUTE.
      Servers can start sending this code when enough clients recognize
      it. Also update the spec to reflect this new reason. Bugfix on
      0.1.0.1-rc; fixes part of bug 1793.
    - Delay geoip stats collection by bridges for 6 hours, not 2 hours,
      when we switch from being a public relay to a bridge. Otherwise
      there will still be clients that see the relay in their consensus,
      and the stats will end up wrong. Bugfix on 0.2.1.15-rc; fixes bug
      932 even more.
    - Instead of giving an assertion failure on an internal mismatch
      on estimated freelist size, just log a BUG warning and try later.
      Mitigates but does not fix bug 1125.
    - Fix an assertion failure that could occur in caches or bridge users
      when using a very short voting interval on a testing network.
      Diagnosed by Robert Hogan. Fixes bug 1141; bugfix on 0.2.0.8-alpha.

  o Minor bugfixes (on 0.2.2.x):
    - Alter directory authorities to always consider Exit-flagged nodes
      as potential Guard nodes in their votes. The actual decision to
      use Exits as Guards is done in the consensus bandwidth weights.
      Fixes bug 1294; bugfix on 0.2.2.10-alpha.
    - When the controller is reporting the purpose of circuits that
      didn't finish building before the circuit build timeout, it was
      printing UNKNOWN_13. Now print EXPIRED. Bugfix on 0.2.2.14-alpha.
    - Our libevent version parsing code couldn't handle versions like
      1.4.14b-stable and incorrectly warned the user about using an
      old and broken version of libevent. Treat 1.4.14b-stable like
      1.4.14-stable when parsing the version. Fixes bug 1731; bugfix
      on 0.2.2.1-alpha.
    - Don't use substitution references like $(VAR:MOD) when
      $(asciidoc_files) is empty -- make(1) on NetBSD transforms
      '$(:x)' to 'x' rather than the empty string. This bites us in
      doc/ when configured with --disable-asciidoc. Bugfix on
      0.2.2.9-alpha; fixes bug 1773.
    - Remove a spurious hidden service server-side log notice about
      "Ancient non-dirty circuits". Bugfix on 0.2.2.14-alpha; fixes
      bug 1741.
    - Fix compilation with --with-dmalloc set. Bugfix on 0.2.2.6-alpha;
      fixes bug 1832.
    - Correctly report written bytes on linked connections. Found while
      implementing 1790. Bugfix on 0.2.2.4-alpha.
    - Fix three memory leaks: one in circuit_build_times_parse_state(),
      one in dirvote_add_signatures_to_pending_consensus(), and one every
      time we parse a v3 network consensus. Bugfixes on 0.2.2.14-alpha,
      0.2.2.6-alpha, and 0.2.2.10-alpha respectively; fixes bug 1831.

  o Code simplifications and refactoring:
    - Take a first step towards making or.h smaller by splitting out
      function definitions for all source files in src/or/. Leave
      structures and defines in or.h for now.
    - Remove a bunch of unused function declarations as well as a block of
      #if 0'd code from the unit tests. Closes bug 1824.
    - New unit tests for exit-port history statistics; refactored exit
      statistics code to be more easily tested.
    - Remove the old debian/ directory from the main Tor distribution.
      The official Tor-for-debian git repository lives at the URL
      https://git.torproject.org/debian/tor.git


Changes in version 0.2.2.14-alpha - 2010-07-12
  Tor 0.2.2.14-alpha greatly improves client-side handling of
  circuit build timeouts, which are used to estimate speed and improve
  performance. We also move to a much better GeoIP database, port Tor to
  Windows CE, introduce new compile flags that improve code security,
  add an eighth v3 directory authority, and address a lot of more
  minor issues.

  o Major bugfixes:
    - Tor directory authorities no longer crash when started with a
      cached-microdesc-consensus file in their data directory. Bugfix
      on 0.2.2.6-alpha; fixes bug 1532.
    - Treat an unset $HOME like an empty $HOME rather than triggering an
      assert. Bugfix on 0.0.8pre1; fixes bug 1522.
    - Ignore negative and large circuit build timeout values that can
      happen during a suspend or hibernate. These values caused various
      asserts to fire. Bugfix on 0.2.2.2-alpha; fixes bug 1245.
    - Alter calculation of Pareto distribution parameter 'Xm' for
      Circuit Build Timeout learning to use the weighted average of the
      top N=3 modes (because we have three entry guards). Considering
      multiple modes should improve the timeout calculation in some cases,
      and prevent extremely high timeout values. Bugfix on 0.2.2.2-alpha;
      fixes bug 1335.
    - Alter calculation of Pareto distribution parameter 'Alpha' to use a
      right censored distribution model. This approach improves over the
      synthetic timeout generation approach that was producing insanely
      high timeout values. Now we calculate build timeouts using truncated
      times. Bugfix on 0.2.2.2-alpha; fixes bugs 1245 and 1335.
    - Do not close circuits that are under construction when they reach
      the circuit build timeout. Instead, leave them building (but do not
      use them) for up until the time corresponding to the 95th percentile
      on the Pareto CDF or 60 seconds, whichever is greater. This is done
      to provide better data for the new Pareto model. This percentile
      can be controlled by the consensus.

  o Major features:
    - Move to the June 2010 Maxmind GeoLite country db (rather than the
      June 2009 ip-to-country GeoIP db) for our statistics that count
      how many users relays are seeing from each country. Now we have
      more accurate data for many African countries.
    - Port Tor to build and run correctly on Windows CE systems, using
      the wcecompat library. Contributed by Valerio Lupi.
    - New "--enable-gcc-hardening" ./configure flag (off by default)
      to turn on gcc compile time hardening options. It ensures
      that signed ints have defined behavior (-fwrapv), enables
      -D_FORTIFY_SOURCE=2 (requiring -O2), adds stack smashing protection
      with canaries (-fstack-protector-all), turns on ASLR protection if
      supported by the kernel (-fPIE, -pie), and adds additional security
      related warnings. Verified to work on Mac OS X and Debian Lenny.
    - New "--enable-linker-hardening" ./configure flag (off by default)
      to turn on ELF specific hardening features (relro, now). This does
      not work with Mac OS X or any other non-ELF binary format.

  o New directory authorities:
    - Set up maatuska (run by Linus Nordberg) as the eighth v3 directory
      authority.

  o Minor features:
    - New config option "WarnUnsafeSocks 0" disables the warning that
      occurs whenever Tor receives only an IP address instead of a
      hostname. Setups that do DNS locally over Tor are fine, and we
      shouldn't spam the logs in that case.
    - Convert the HACKING file to asciidoc, and add a few new sections
      to it, explaining how we use Git, how we make changelogs, and
      what should go in a patch.
    - Add a TIMEOUT_RATE keyword to the BUILDTIMEOUT_SET control port
      event, to give information on the current rate of circuit timeouts
      over our stored history.
    - Add ability to disable circuit build time learning via consensus
      parameter and via a LearnCircuitBuildTimeout config option. Also
      automatically disable circuit build time calculation if we are
      either a AuthoritativeDirectory, or if we fail to write our state
      file. Fixes bug 1296.
    - More gracefully handle corrupt state files, removing asserts
      in favor of saving a backup and resetting state.
    - Rename the "log.h" header to "torlog.h" so as to conflict with fewer
      system headers.

  o Minor bugfixes:
    - Build correctly on OSX with zlib 1.2.4 and higher with all warnings
      enabled.
    - When a2x fails, mention that the user could disable manpages instead
      of trying to fix their asciidoc installation.
    - Where available, use Libevent 2.0's periodic timers so that our
      once-per-second cleanup code gets called even more closely to
      once per second than it would otherwise. Fixes bug 943.
    - If you run a bridge that listens on multiple IP addresses, and
      some user configures a bridge address that uses a different IP
      address than your bridge writes in its router descriptor, and the
      user doesn't specify an identity key, their Tor would discard the
      descriptor because "it isn't one of our configured bridges", and
      fail to bootstrap. Now believe the descriptor and bootstrap anyway.
      Bugfix on 0.2.0.3-alpha.
    - If OpenSSL fails to make a duplicate of a private or public key, log
      an error message and try to exit cleanly. May help with debugging
      if bug 1209 ever remanifests.
    - Save a couple bytes in memory allocation every time we escape
      certain characters in a string. Patch from Florian Zumbiehl.
    - Make it explicit that we don't cannibalize one-hop circuits. This
      happens in the wild, but doesn't turn out to be a problem because
      we fortunately don't use those circuits. Many thanks to outofwords
      for the initial analysis and to swissknife who confirmed that
      two-hop circuits are actually created.
    - Make directory mirrors report non-zero dirreq-v[23]-shares again.
      Fixes bug 1564; bugfix on 0.2.2.9-alpha.
    - Eliminate a case where a circuit build time warning was displayed
      after network connectivity resumed. Bugfix on 0.2.2.2-alpha.


Changes in version 0.2.1.26 - 2010-05-02
  Tor 0.2.1.26 addresses the recent connection and memory overload
  problems we've been seeing on relays, especially relays with their
  DirPort open. If your relay has been crashing, or you turned it off
  because it used too many resources, give this release a try.

  This release also fixes yet another instance of broken OpenSSL libraries
  that was causing some relays to drop out of the consensus.

  o Major bugfixes:
    - Teach relays to defend themselves from connection overload. Relays
      now close idle circuits early if it looks like they were intended
      for directory fetches. Relays are also more aggressive about closing
      TLS connections that have no circuits on them. Such circuits are
      unlikely to be re-used, and tens of thousands of them were piling
      up at the fast relays, causing the relays to run out of sockets
      and memory. Bugfix on 0.2.0.22-rc (where clients started tunneling
      their directory fetches over TLS).
    - Fix SSL renegotiation behavior on OpenSSL versions like on Centos
      that claim to be earlier than 0.9.8m, but which have in reality
      backported huge swaths of 0.9.8m or 0.9.8n renegotiation
      behavior. Possible fix for some cases of bug 1346.
    - Directory mirrors were fetching relay descriptors only from v2
      directory authorities, rather than v3 authorities like they should.
      Only 2 v2 authorities remain (compared to 7 v3 authorities), leading
      to a serious bottleneck. Bugfix on 0.2.0.9-alpha. Fixes bug 1324.

  o Minor bugfixes:
    - Finally get rid of the deprecated and now harmful notion of "clique
      mode", where directory authorities maintain TLS connections to
      every other relay.

  o Testsuite fixes:
    - In the util/threads test, no longer free the test_mutex before all
      worker threads have finished. Bugfix on 0.2.1.6-alpha.
    - The master thread could starve the worker threads quite badly on
      certain systems, causing them to run only partially in the allowed
      window. This resulted in test failures. Now the master thread sleeps
      occasionally for a few microseconds while the two worker-threads
      compete for the mutex. Bugfix on 0.2.0.1-alpha.


Changes in version 0.2.2.13-alpha - 2010-04-24
  Tor 0.2.2.13-alpha addresses the recent connection and memory overload
  problems we've been seeing on relays, especially relays with their
  DirPort open. If your relay has been crashing, or you turned it off
  because it used too many resources, give this release a try.

  o Major bugfixes:
    - Teach relays to defend themselves from connection overload. Relays
      now close idle circuits early if it looks like they were intended
      for directory fetches. Relays are also more aggressive about closing
      TLS connections that have no circuits on them. Such circuits are
      unlikely to be re-used, and tens of thousands of them were piling
      up at the fast relays, causing the relays to run out of sockets
      and memory. Bugfix on 0.2.0.22-rc (where clients started tunneling
      their directory fetches over TLS).

  o Minor features:
    - Finally get rid of the deprecated and now harmful notion of "clique
      mode", where directory authorities maintain TLS connections to
      every other relay.
    - Directory authorities now do an immediate reachability check as soon
      as they hear about a new relay. This change should slightly reduce
      the time between setting up a relay and getting listed as running
      in the consensus. It should also improve the time between setting
      up a bridge and seeing use by bridge users.
    - Directory authorities no longer launch a TLS connection to every
      relay as they startup. Now that we have 2k+ descriptors cached,
      the resulting network hiccup is becoming a burden. Besides,
      authorities already avoid voting about Running for the first half
      hour of their uptime.


Changes in version 0.2.2.12-alpha - 2010-04-20
  Tor 0.2.2.12-alpha fixes a critical bug in how directory authorities
  handle and vote on descriptors. It was causing relays to drop out of
  the consensus.

  o Major bugfixes:
    - Many relays have been falling out of the consensus lately because
      not enough authorities know about their descriptor for them to get
      a majority of votes. When we deprecated the v2 directory protocol,
      we got rid of the only way that v3 authorities can hear from each
      other about other descriptors. Now authorities examine every v3
      vote for new descriptors, and fetch them from that authority. Bugfix
      on 0.2.1.23.
    - Fix two typos in tor_vasprintf() that broke the compile on Windows,
      and a warning in or.h related to bandwidth_weight_rule_t that
      prevented clean compile on OS X. Fixes bug 1363; bugfix on
      0.2.2.11-alpha.
    - Fix a segfault on relays when DirReqStatistics is enabled
      and 24 hours pass. Bug found by keb. Fixes bug 1365; bugfix on
      0.2.2.11-alpha.

  o Minor bugfixes:
    - Demote a confusing TLS warning that relay operators might get when
      someone tries to talk to their OrPort. It is neither the operator's
      fault nor can they do anything about it. Fixes bug 1364; bugfix
      on 0.2.0.14-alpha.


Changes in version 0.2.2.11-alpha - 2010-04-15
  Tor 0.2.2.11-alpha fixes yet another instance of broken OpenSSL
  libraries that was causing some relays to drop out of the consensus.

  o Major bugfixes:
    - Directory mirrors were fetching relay descriptors only from v2
      directory authorities, rather than v3 authorities like they should.
      Only 2 v2 authorities remain (compared to 7 v3 authorities), leading
      to a serious bottleneck. Bugfix on 0.2.0.9-alpha. Fixes bug 1324.
    - Fix a parsing error that made every possible value of
      CircPriorityHalflifeMsec get treated as "1 msec". Bugfix
      on 0.2.2.7-alpha. Rename CircPriorityHalflifeMsec to
      CircuitPriorityHalflifeMsec, so authorities can tell newer relays
      about the option without breaking older ones.
    - Fix SSL renegotiation behavior on OpenSSL versions like on Centos
      that claim to be earlier than 0.9.8m, but which have in reality
      backported huge swaths of 0.9.8m or 0.9.8n renegotiation
      behavior. Possible fix for some cases of bug 1346.

  o Minor features:
    - Experiment with a more aggressive approach to preventing clients
      from making one-hop exit streams. Exit relays who want to try it
      out can set "RefuseUnknownExits 1" in their torrc, and then look
      for "Attempt by %s to open a stream" log messages. Let us know
      how it goes!
    - Add support for statically linking zlib by specifying
      --enable-static-zlib, to go with our support for statically linking
      openssl and libevent. Resolves bug 1358.

  o Minor bugfixes:
    - Fix a segfault that happens whenever a Tor client that is using
      libevent2's bufferevents gets a hup signal. Bugfix on 0.2.2.5-alpha;
      fixes bug 1341.
    - When we cleaned up the contrib/tor-exit-notice.html file, we left
      out the first line. Fixes bug 1295.
    - When building the manpage from a tarball, we required asciidoc, but
      the asciidoc -> roff/html conversion was already done for the
      tarball. Make 'make' complain only when we need asciidoc (either
      because we're compiling directly from git, or because we altered
      the asciidoc manpage in the tarball). Bugfix on 0.2.2.9-alpha.
    - When none of the directory authorities vote on any params, Tor
      segfaulted when trying to make the consensus from the votes. We
      didn't trigger the bug in practice, because authorities do include
      params in their votes. Bugfix on 0.2.2.10-alpha; fixes bug 1322.

  o Testsuite fixes:
    - In the util/threads test, no longer free the test_mutex before all
      worker threads have finished. Bugfix on 0.2.1.6-alpha.
    - The master thread could starve the worker threads quite badly on
      certain systems, causing them to run only partially in the allowed
      window. This resulted in test failures. Now the master thread sleeps
      occasionally for a few microseconds while the two worker-threads
      compete for the mutex. Bugfix on 0.2.0.1-alpha.


Changes in version 0.2.2.10-alpha - 2010-03-07
  Tor 0.2.2.10-alpha fixes a regression introduced in 0.2.2.9-alpha that
  could prevent relays from guessing their IP address correctly. It also
  starts the groundwork for another client-side performance boost, since
  currently we're not making efficient use of relays that have both the
  Guard flag and the Exit flag.

  o Major bugfixes:
    - Fix a regression from our patch for bug 1244 that caused relays
      to guess their IP address incorrectly if they didn't set Address
      in their torrc and/or their address fails to resolve. Bugfix on
      0.2.2.9-alpha; fixes bug 1269.

  o Major features (performance):
    - Directory authorities now compute consensus weightings that instruct
      clients how to weight relays flagged as Guard, Exit, Guard+Exit,
      and no flag. Clients that use these weightings will distribute
      network load more evenly across these different relay types. The
      weightings are in the consensus so we can change them globally in
      the future. Extra thanks to "outofwords" for finding some nasty
      security bugs in the first implementation of this feature.

  o Minor features (performance):
    - Always perform router selections using weighted relay bandwidth,
      even if we don't need a high capacity circuit at the time. Non-fast
      circuits now only differ from fast ones in that they can use relays
      not marked with the Fast flag. This "feature" could turn out to
      be a horrible bug; we should investigate more before it goes into
      a stable release.

  o Minor features:
    - Allow disabling building of the manpages. Skipping the manpage
      speeds up the build considerably.

  o Minor bugfixes (on 0.2.2.x):
    - Fix a memleak in the EXTENDCIRCUIT logic. Spotted by coverity.
      Bugfix on 0.2.2.9-alpha.
    - Disallow values larger than INT32_MAX for PerConnBWRate|Burst
      config option. Bugfix on 0.2.2.7-alpha.
    - Ship the asciidoc-helper file in the tarball, so that people can
      build from source if they want to, and touching the .1.txt files
      doesn't break the build. Bugfix on 0.2.2.9-alpha.

  o Minor bugfixes (on 0.2.1.x or earlier):
    - Fix a dereference-then-NULL-check sequence when publishing
      descriptors. Bugfix on 0.2.1.5-alpha. Discovered by ekir; fixes
      bug 1255.
    - Fix another dereference-then-NULL-check sequence. Bugfix on
      0.2.1.14-rc. Discovered by ekir; fixes bug 1256.
    - Make sure we treat potentially not NUL-terminated strings correctly.
      Bugfix on 0.1.1.13-alpha. Discovered by rieo; fixes bug 1257.

  o Code simplifications and refactoring:
    - Fix some urls in the exit notice file and make it XHTML1.1 strict
      compliant. Based on a patch from Christian Kujau.
    - Don't use sed in asciidoc-helper anymore.
    - Make the build process fail if asciidoc cannot be found and
      building with asciidoc isn't disabled.


Changes in version 0.2.2.9-alpha - 2010-02-22
  Tor 0.2.2.9-alpha makes Tor work again on the latest OS X, updates the
  location of a directory authority, and cleans up a bunch of small bugs.

  o Directory authority changes:
    - Change IP address for dannenberg (v3 directory authority), and
      remove moria2 (obsolete v1, v2 directory authority and v0 hidden
      service directory authority) from the list.

  o Major bugfixes:
    - Make Tor work again on the latest OS X: when deciding whether to
      use strange flags to turn TLS renegotiation on, detect the OpenSSL
      version at run-time, not compile time. We need to do this because
      Apple doesn't update its dev-tools headers when it updates its
      libraries in a security patch.
    - Fix a potential buffer overflow in lookup_last_hid_serv_request()
      that could happen on 32-bit platforms with 64-bit time_t. Also fix
      a memory leak when requesting a hidden service descriptor we've
      requested before. Fixes bug 1242, bugfix on 0.2.0.18-alpha. Found
      by aakova.
    - Authorities could be tricked into giving out the Exit flag to relays
      that didn't allow exiting to any ports. This bug could screw
      with load balancing and stats. Bugfix on 0.1.1.6-alpha; fixes bug
      1238. Bug discovered by Martin Kowalczyk.
    - When freeing a session key, zero it out completely. We only zeroed
      the first ptrsize bytes. Bugfix on 0.0.2pre8. Discovered and
      patched by ekir. Fixes bug 1254.

  o Minor bugfixes:
    - Fix static compilation by listing the openssl libraries in the right
      order. Bugfix on Tor 0.2.2.8-alpha; fixes bug 1237.
    - Resume handling .exit hostnames in a special way: originally we
      stripped the .exit part and used the requested exit relay. In
      0.2.2.1-alpha we stopped treating them in any special way, meaning
      if you use a .exit address then Tor will pass it on to the exit
      relay. Now we reject the .exit stream outright, since that behavior
      might be more expected by the user. Found and diagnosed by Scott
      Bennett and Downie on or-talk.
    - Don't spam the controller with events when we have no file
      descriptors available. Bugfix on 0.2.1.5-alpha. (Rate-limiting
      for log messages was already solved from bug 748.)
    - Avoid a bogus overlapped memcpy in tor_addr_copy(). Reported by
      "memcpyfail".
    - Make the DNSPort option work with libevent 2.x. Don't alter the
      behaviour for libevent 1.x. Fixes bug 1143. Found by SwissTorExit.
    - Emit a GUARD DROPPED controller event for a case we missed.
    - Make more fields in the controller protocol case-insensitive, since
      control-spec.txt said they were.
    - Refactor resolve_my_address() to not use gethostbyname() anymore.
      Fixes bug 1244; bugfix on 0.0.2pre25. Reported by Mike Mestnik.
    - Fix a spec conformance issue: the network-status-version token
      must be the first token in a v3 consensus or vote. Discovered by
      parakeep. Bugfix on 0.2.0.3-alpha.

  o Code simplifications and refactoring:
    - Generate our manpage and HTML documentation using Asciidoc. This
      change should make it easier to maintain the documentation, and
      produce nicer HTML.
    - Remove the --enable-iphone option. According to reports from Marco
      Bonetti, Tor builds fine without any special tweaking on recent
      iPhone SDK versions.
    - Removed some unnecessary files from the source distribution. The
      AUTHORS file has now been merged into the people page on the
      website. The roadmaps and design doc can now be found in the
      projects directory in svn.
    - Enabled various circuit build timeout constants to be controlled
      by consensus parameters. Also set better defaults for these
      parameters based on experimentation on broadband and simulated
      high latency links.

  o Minor features:
    - The 'EXTENDCIRCUIT' control port command can now be used with
      a circ id of 0 and no path. This feature will cause Tor to build
      a new 'fast' general purpose circuit using its own path selection
      algorithms.
    - Added a BUILDTIMEOUT_SET controller event to describe changes
      to the circuit build timeout.
    - Future-proof the controller protocol a bit by ignoring keyword
      arguments we do not recognize.
    - Expand homedirs passed to tor-checkkey. This should silence a
      coverity complaint about passing a user-supplied string into
      open() without checking it.


Changes in version 0.2.1.25 - 2010-03-16
  Tor 0.2.1.25 fixes a regression introduced in 0.2.1.23 that could
  prevent relays from guessing their IP address correctly. It also fixes
  several minor potential security bugs.

  o Major bugfixes:
    - Fix a regression from our patch for bug 1244 that caused relays
      to guess their IP address incorrectly if they didn't set Address
      in their torrc and/or their address fails to resolve. Bugfix on
      0.2.1.23; fixes bug 1269.
    - When freeing a session key, zero it out completely. We only zeroed
      the first ptrsize bytes. Bugfix on 0.0.2pre8. Discovered and
      patched by ekir. Fixes bug 1254.

  o Minor bugfixes:
    - Fix a dereference-then-NULL-check sequence when publishing
      descriptors. Bugfix on 0.2.1.5-alpha. Discovered by ekir; fixes
      bug 1255.
    - Fix another dereference-then-NULL-check sequence. Bugfix on
      0.2.1.14-rc. Discovered by ekir; fixes bug 1256.
    - Make sure we treat potentially not NUL-terminated strings correctly.
      Bugfix on 0.1.1.13-alpha. Discovered by rieo; fixes bug 1257.



Changes in version 0.2.1.24 - 2010-02-21
  Tor 0.2.1.24 makes Tor work again on the latest OS X -- this time
  for sure!

  o Minor bugfixes:
    - Work correctly out-of-the-box with even more vendor-patched versions
      of OpenSSL. In particular, make it so Debian and OS X don't need
      customized patches to run/build.


Changes in version 0.2.1.23 - 2010-02-13
  Tor 0.2.1.23 fixes a huge client-side performance bug, makes Tor work
  again on the latest OS X, and updates the location of a directory
  authority.

  o Major bugfixes (performance):
    - We were selecting our guards uniformly at random, and then weighting
      which of our guards we'd use uniformly at random. This imbalance
      meant that Tor clients were severely limited on throughput (and
      probably latency too) by the first hop in their circuit. Now we
      select guards weighted by currently advertised bandwidth. We also
      automatically discard guards picked using the old algorithm. Fixes
      bug 1217; bugfix on 0.2.1.3-alpha. Found by Mike Perry.

  o Major bugfixes:
    - Make Tor work again on the latest OS X: when deciding whether to
      use strange flags to turn TLS renegotiation on, detect the OpenSSL
      version at run-time, not compile time. We need to do this because
      Apple doesn't update its dev-tools headers when it updates its
      libraries in a security patch.
    - Fix a potential buffer overflow in lookup_last_hid_serv_request()
      that could happen on 32-bit platforms with 64-bit time_t. Also fix
      a memory leak when requesting a hidden service descriptor we've
      requested before. Fixes bug 1242, bugfix on 0.2.0.18-alpha. Found
      by aakova.

  o Directory authority changes:
    - Change IP address for dannenberg (v3 directory authority), and
      remove moria2 (obsolete v1, v2 directory authority and v0 hidden
      service directory authority) from the list.

  o Minor bugfixes:
    - Refactor resolve_my_address() to not use gethostbyname() anymore.
      Fixes bug 1244; bugfix on 0.0.2pre25. Reported by Mike Mestnik.

  o Minor features:
    - Avoid a mad rush at the beginning of each month when each client
      rotates half of its guards. Instead we spread the rotation out
      throughout the month, but we still avoid leaving a precise timestamp
      in the state file about when we first picked the guard. Improves
      over the behavior introduced in 0.1.2.17.


Changes in version 0.2.2.8-alpha - 2010-01-26
  Tor 0.2.2.8-alpha fixes a crash bug in 0.2.2.7-alpha that has been
  causing bridge relays to disappear. If you're running a bridge,
  please upgrade.

  o Major bugfixes:
    - Fix a memory corruption bug on bridges that occured during the
      inclusion of stats data in extra-info descriptors. Also fix the
      interface for geoip_get_bridge_stats* to prevent similar bugs in
      the future. Diagnosis by Tas, patch by Karsten and Sebastian.
      Fixes bug 1208; bugfix on 0.2.2.7-alpha.

  o Minor bugfixes:
    - Ignore OutboundBindAddress when connecting to localhost.
      Connections to localhost need to come _from_ localhost, or else
      local servers (like DNS and outgoing HTTP/SOCKS proxies) will often
      refuse to listen.


Changes in version 0.2.2.7-alpha - 2010-01-19
  Tor 0.2.2.7-alpha fixes a huge client-side performance bug, as well
  as laying the groundwork for further relay-side performance fixes. It
  also starts cleaning up client behavior with respect to the EntryNodes,
  ExitNodes, and StrictNodes config options.

  This release also rotates two directory authority keys, due to a
  security breach of some of the Torproject servers.

  o Directory authority changes:
    - Rotate keys (both v3 identity and relay identity) for moria1
      and gabelmoo.

  o Major features (performance):
    - We were selecting our guards uniformly at random, and then weighting
      which of our guards we'd use uniformly at random. This imbalance
      meant that Tor clients were severely limited on throughput (and
      probably latency too) by the first hop in their circuit. Now we
      select guards weighted by currently advertised bandwidth. We also
      automatically discard guards picked using the old algorithm. Fixes
      bug 1217; bugfix on 0.2.1.3-alpha. Found by Mike Perry.
    - When choosing which cells to relay first, relays can now favor
      circuits that have been quiet recently, to provide lower latency
      for low-volume circuits. By default, relays enable or disable this
      feature based on a setting in the consensus. You can override
      this default by using the new "CircuitPriorityHalflife" config
      option. Design and code by Ian Goldberg, Can Tang, and Chris
      Alexander.
    - Add separate per-conn write limiting to go with the per-conn read
      limiting. We added a global write limit in Tor 0.1.2.5-alpha,
      but never per-conn write limits.
    - New consensus params "bwconnrate" and "bwconnburst" to let us
      rate-limit client connections as they enter the network. It's
      controlled in the consensus so we can turn it on and off for
      experiments. It's starting out off. Based on proposal 163.

  o Major features (relay selection options):
    - Switch to a StrictNodes config option, rather than the previous
      "StrictEntryNodes" / "StrictExitNodes" separation that was missing a
      "StrictExcludeNodes" option.
    - If EntryNodes, ExitNodes, ExcludeNodes, or ExcludeExitNodes
      change during a config reload, mark and discard all our origin
      circuits. This fix should address edge cases where we change the
      config options and but then choose a circuit that we created before
      the change.
    - If EntryNodes or ExitNodes are set, be more willing to use an
      unsuitable (e.g. slow or unstable) circuit. The user asked for it,
      they get it.
    - Make EntryNodes config option much more aggressive even when
      StrictNodes is not set. Before it would prepend your requested
      entrynodes to your list of guard nodes, but feel free to use others
      after that. Now it chooses only from your EntryNodes if any of
      those are available, and only falls back to others if a) they're
      all down and b) StrictNodes is not set.
    - Now we refresh your entry guards from EntryNodes at each consensus
      fetch -- rather than just at startup and then they slowly rot as
      the network changes.

  o Major bugfixes:
    - Stop bridge directory authorities from answering dbg-stability.txt
      directory queries, which would let people fetch a list of all
      bridge identities they track. Bugfix on 0.2.1.6-alpha.

  o Minor features:
    - Log a notice when we get a new control connection. Now it's easier
      for security-conscious users to recognize when a local application
      is knocking on their controller door. Suggested by bug 1196.
    - New config option "CircuitStreamTimeout" to override our internal
      timeout schedule for how many seconds until we detach a stream from
      a circuit and try a new circuit. If your network is particularly
      slow, you might want to set this to a number like 60.
    - New controller command "getinfo config-text". It returns the
      contents that Tor would write if you send it a SAVECONF command,
      so the controller can write the file to disk itself.
    - New options for SafeLogging to allow scrubbing only log messages
      generated while acting as a relay.
    - Ship the bridges spec file in the tarball too.
    - Avoid a mad rush at the beginning of each month when each client
      rotates half of its guards. Instead we spread the rotation out
      throughout the month, but we still avoid leaving a precise timestamp
      in the state file about when we first picked the guard. Improves
      over the behavior introduced in 0.1.2.17.

  o Minor bugfixes (compiling):
    - Fix compilation on OS X 10.3, which has a stub mlockall() but
      hides it. Bugfix on 0.2.2.6-alpha.
    - Fix compilation on Solaris by removing support for the
      DisableAllSwap config option. Solaris doesn't have an rlimit for
      mlockall, so we cannot use it safely. Fixes bug 1198; bugfix on
      0.2.2.6-alpha.

  o Minor bugfixes (crashes):
    - Do not segfault when writing buffer stats when we haven't observed
      a single circuit to report about. Found by Fabian Lanze. Bugfix on
      0.2.2.1-alpha.
    - If we're in the pathological case where there's no exit bandwidth
      but there is non-exit bandwidth, or no guard bandwidth but there
      is non-guard bandwidth, don't crash during path selection. Bugfix
      on 0.2.0.3-alpha.
    - Fix an impossible-to-actually-trigger buffer overflow in relay
      descriptor generation. Bugfix on 0.1.0.15.

  o Minor bugfixes (privacy):
    - Fix an instance where a Tor directory mirror might accidentally
      log the IP address of a misbehaving Tor client. Bugfix on
      0.1.0.1-rc.
    - Don't list Windows capabilities in relay descriptors. We never made
      use of them, and maybe it's a bad idea to publish them. Bugfix
      on 0.1.1.8-alpha.

  o Minor bugfixes (other):
    - Resolve an edge case in path weighting that could make us misweight
      our relay selection. Fixes bug 1203; bugfix on 0.0.8rc1.
    - Fix statistics on client numbers by country as seen by bridges that
      were broken in 0.2.2.1-alpha. Also switch to reporting full 24-hour
      intervals instead of variable 12-to-48-hour intervals.
    - After we free an internal connection structure, overwrite it
      with a different memory value than we use for overwriting a freed
      internal circuit structure. Should help with debugging. Suggested
      by bug 1055.
    - Update our OpenSSL 0.9.8l fix so that it works with OpenSSL 0.9.8m
      too.

  o Removed features:
    - Remove the HSAuthorityRecordStats option that version 0 hidden
      service authorities could have used to track statistics of overall
      hidden service usage.


Changes in version 0.2.1.22 - 2010-01-19
  Tor 0.2.1.22 fixes a critical privacy problem in bridge directory
  authorities -- it would tell you its whole history of bridge descriptors
  if you make the right directory request. This stable update also
  rotates two of the seven v3 directory authority keys and locations.

  o Directory authority changes:
    - Rotate keys (both v3 identity and relay identity) for moria1
      and gabelmoo.

  o Major bugfixes:
    - Stop bridge directory authorities from answering dbg-stability.txt
      directory queries, which would let people fetch a list of all
      bridge identities they track. Bugfix on 0.2.1.6-alpha.


Changes in version 0.2.1.21 - 2009-12-21
  Tor 0.2.1.21 fixes an incompatibility with the most recent OpenSSL
  library. If you use Tor on Linux / Unix and you're getting SSL
  renegotiation errors, upgrading should help. We also recommend an
  upgrade if you're an exit relay.

  o Major bugfixes:
    - Work around a security feature in OpenSSL 0.9.8l that prevents our
      handshake from working unless we explicitly tell OpenSSL that we
      are using SSL renegotiation safely. We are, of course, but OpenSSL
      0.9.8l won't work unless we say we are.
    - Avoid crashing if the client is trying to upload many bytes and the
      circuit gets torn down at the same time, or if the flip side
      happens on the exit relay. Bugfix on 0.2.0.1-alpha; fixes bug 1150.

  o Minor bugfixes:
    - Do not refuse to learn about authority certs and v2 networkstatus
      documents that are older than the latest consensus. This bug might
      have degraded client bootstrapping. Bugfix on 0.2.0.10-alpha.
      Spotted and fixed by xmux.
    - Fix a couple of very-hard-to-trigger memory leaks, and one hard-to-
      trigger platform-specific option misparsing case found by Coverity
      Scan.
    - Fix a compilation warning on Fedora 12 by removing an impossible-to-
      trigger assert. Fixes bug 1173.


Changes in version 0.2.2.6-alpha - 2009-11-19
  Tor 0.2.2.6-alpha lays the groundwork for many upcoming features:
  support for the new lower-footprint "microdescriptor" directory design,
  future-proofing our consensus format against new hash functions or
  other changes, and an Android port. It also makes Tor compatible with
  the upcoming OpenSSL 0.9.8l release, and fixes a variety of bugs.

  o Major features:
    - Directory authorities can now create, vote on, and serve multiple
      parallel formats of directory data as part of their voting process.
      Partially implements Proposal 162: "Publish the consensus in
      multiple flavors".
    - Directory authorities can now agree on and publish small summaries
      of router information that clients can use in place of regular
      server descriptors. This transition will eventually allow clients
      to use far less bandwidth for downloading information about the
      network. Begins the implementation of Proposal 158: "Clients
      download consensus + microdescriptors".
    - The directory voting system is now extensible to use multiple hash
      algorithms for signatures and resource selection. Newer formats
      are signed with SHA256, with a possibility for moving to a better
      hash algorithm in the future.
    - New DisableAllSwap option. If set to 1, Tor will attempt to lock all
      current and future memory pages via mlockall(). On supported
      platforms (modern Linux and probably BSD but not Windows or OS X),
      this should effectively disable any and all attempts to page out
      memory. This option requires that you start your Tor as root --
      if you use DisableAllSwap, please consider using the User option
      to properly reduce the privileges of your Tor.
    - Numerous changes, bugfixes, and workarounds from Nathan Freitas
      to help Tor build correctly for Android phones.

  o Major bugfixes:
    - Work around a security feature in OpenSSL 0.9.8l that prevents our
      handshake from working unless we explicitly tell OpenSSL that we
      are using SSL renegotiation safely. We are, but OpenSSL 0.9.8l
      won't work unless we say we are.

  o Minor bugfixes:
    - Fix a crash bug when trying to initialize the evdns module in
      Libevent 2. Bugfix on 0.2.1.16-rc.
    - Stop logging at severity 'warn' when some other Tor client tries
      to establish a circuit with us using weak DH keys. It's a protocol
      violation, but that doesn't mean ordinary users need to hear about
      it. Fixes the bug part of bug 1114. Bugfix on 0.1.0.13.
    - Do not refuse to learn about authority certs and v2 networkstatus
      documents that are older than the latest consensus. This bug might
      have degraded client bootstrapping. Bugfix on 0.2.0.10-alpha.
      Spotted and fixed by xmux.
    - Fix numerous small code-flaws found by Coverity Scan Rung 3.
    - If all authorities restart at once right before a consensus vote,
      nobody will vote about "Running", and clients will get a consensus
      with no usable relays. Instead, authorities refuse to build a
      consensus if this happens. Bugfix on 0.2.0.10-alpha; fixes bug 1066.
    - If your relay can't keep up with the number of incoming create
      cells, it would log one warning per failure into your logs. Limit
      warnings to 1 per minute. Bugfix on 0.0.2pre10; fixes bug 1042.
    - Bridges now use "reject *:*" as their default exit policy. Bugfix
      on 0.2.0.3-alpha; fixes bug 1113.
    - Fix a memory leak on directory authorities during voting that was
      introduced in 0.2.2.1-alpha. Found via valgrind.


Changes in version 0.2.1.20 - 2009-10-15
  Tor 0.2.1.20 fixes a crash bug when you're accessing many hidden
  services at once, prepares for more performance improvements, and
  fixes a bunch of smaller bugs.

  The Windows and OS X bundles also include a more recent Vidalia,
  and switch from Privoxy to Polipo.

  The OS X installers are now drag and drop. It's best to un-install
  Tor/Vidalia and then install this new bundle, rather than upgrade. If
  you want to upgrade, you'll need to update the paths for Tor and Polipo
  in the Vidalia Settings window.

  o Major bugfixes:
    - Send circuit or stream sendme cells when our window has decreased
      by 100 cells, not when it has decreased by 101 cells. Bug uncovered
      by Karsten when testing the "reduce circuit window" performance
      patch. Bugfix on the 54th commit on Tor -- from July 2002,
      before the release of Tor 0.0.0. This is the new winner of the
      oldest-bug prize.
    - Fix a remotely triggerable memory leak when a consensus document
      contains more than one signature from the same voter. Bugfix on
      0.2.0.3-alpha.
    - Avoid segfault in rare cases when finishing an introduction circuit
      as a client and finding out that we don't have an introduction key
      for it. Fixes bug 1073. Reported by Aaron Swartz.

  o Major features:
    - Tor now reads the "circwindow" parameter out of the consensus,
      and uses that value for its circuit package window rather than the
      default of 1000 cells. Begins the implementation of proposal 168.

  o New directory authorities:
    - Set up urras (run by Jacob Appelbaum) as the seventh v3 directory
      authority.
    - Move moria1 and tonga to alternate IP addresses.

  o Minor bugfixes:
    - Fix a signed/unsigned compile warning in 0.2.1.19.
    - Fix possible segmentation fault on directory authorities. Bugfix on
      0.2.1.14-rc.
    - Fix an extremely rare infinite recursion bug that could occur if
      we tried to log a message after shutting down the log subsystem.
      Found by Matt Edman. Bugfix on 0.2.0.16-alpha.
    - Fix an obscure bug where hidden services on 64-bit big-endian
      systems might mis-read the timestamp in v3 introduce cells, and
      refuse to connect back to the client. Discovered by "rotor".
      Bugfix on 0.2.1.6-alpha.
    - We were triggering a CLOCK_SKEW controller status event whenever
      we connect via the v2 connection protocol to any relay that has
      a wrong clock. Instead, we should only inform the controller when
      it's a trusted authority that claims our clock is wrong. Bugfix
      on 0.2.0.20-rc; starts to fix bug 1074. Reported by SwissTorExit.
    - We were telling the controller about CHECKING_REACHABILITY and
      REACHABILITY_FAILED status events whenever we launch a testing
      circuit or notice that one has failed. Instead, only tell the
      controller when we want to inform the user of overall success or
      overall failure. Bugfix on 0.1.2.6-alpha. Fixes bug 1075. Reported
      by SwissTorExit.
    - Don't warn when we're using a circuit that ends with a node
      excluded in ExcludeExitNodes, but the circuit is not used to access
      the outside world. This should help fix bug 1090. Bugfix on
      0.2.1.6-alpha.
    - Work around a small memory leak in some versions of OpenSSL that
      stopped the memory used by the hostname TLS extension from being
      freed.

  o Minor features:
    - Add a "getinfo status/accepted-server-descriptor" controller
      command, which is the recommended way for controllers to learn
      whether our server descriptor has been successfully received by at
      least on directory authority. Un-recommend good-server-descriptor
      getinfo and status events until we have a better design for them.


Changes in version 0.2.2.5-alpha - 2009-10-11
  Tor 0.2.2.5-alpha fixes a few compile problems in 0.2.2.4-alpha.

  o Major bugfixes:
    - Make the tarball compile again. Oops. Bugfix on 0.2.2.4-alpha.

  o New directory authorities:
    - Move dizum to an alternate IP address.


Changes in version 0.2.2.4-alpha - 2009-10-10
  Tor 0.2.2.4-alpha fixes more crash bugs in 0.2.2.2-alpha. It also
  introduces a new unit test framework, shifts directry authority
  addresses around to reduce the impact from recent blocking events,
  and fixes a few smaller bugs.

  o Major bugfixes:
    - Fix several more asserts in the circuit_build_times code, for
      example one that causes Tor to fail to start once we have
      accumulated 5000 build times in the state file. Bugfixes on
      0.2.2.2-alpha; fixes bug 1108.

  o New directory authorities:
    - Move moria1 and Tonga to alternate IP addresses.

  o Minor features:
    - Log SSL state transitions at debug level during handshake, and
      include SSL states in error messages. This may help debug future
      SSL handshake issues.
    - Add a new "Handshake" log domain for activities that happen
      during the TLS handshake.
    - Revert to the "June 3 2009" ip-to-country file. The September one
      seems to have removed most US IP addresses.
    - Directory authorities now reject Tor relays with versions less than
      0.1.2.14. This step cuts out four relays from the current network,
      none of which are very big.

  o Minor bugfixes:
    - Fix a couple of smaller issues with gathering statistics. Bugfixes
      on 0.2.2.1-alpha.
    - Fix two memory leaks in the error case of
      circuit_build_times_parse_state(). Bugfix on 0.2.2.2-alpha.
    - Don't count one-hop circuits when we're estimating how long it
      takes circuits to build on average. Otherwise we'll set our circuit
      build timeout lower than we should. Bugfix on 0.2.2.2-alpha.
    - Directory authorities no longer change their opinion of, or vote on,
      whether a router is Running, unless they have themselves been
      online long enough to have some idea. Bugfix on 0.2.0.6-alpha.
      Fixes bug 1023.

  o Code simplifications and refactoring:
    - Revise our unit tests to use the "tinytest" framework, so we
      can run tests in their own processes, have smarter setup/teardown
      code, and so on. The unit test code has moved to its own
      subdirectory, and has been split into multiple modules.


Changes in version 0.2.2.3-alpha - 2009-09-23
  Tor 0.2.2.3-alpha fixes a few crash bugs in 0.2.2.2-alpha.

  o Major bugfixes:
    - Fix an overzealous assert in our new circuit build timeout code.
      Bugfix on 0.2.2.2-alpha; fixes bug 1103.

  o Minor bugfixes:
    - If the networkstatus consensus tells us that we should use a
      negative circuit package window, ignore it. Otherwise we'll
      believe it and then trigger an assert. Bugfix on 0.2.2.2-alpha.


Changes in version 0.2.2.2-alpha - 2009-09-21
  Tor 0.2.2.2-alpha introduces our latest performance improvement for
  clients: Tor tracks the average time it takes to build a circuit, and
  avoids using circuits that take too long to build. For fast connections,
  this feature can cut your expected latency in half. For slow or flaky
  connections, it could ruin your Tor experience. Let us know if it does!

  o Major features:
    - Tor now tracks how long it takes to build client-side circuits
      over time, and adapts its timeout to local network performance.
      Since a circuit that takes a long time to build will also provide
      bad performance, we get significant latency improvements by
      discarding the slowest 20% of circuits. Specifically, Tor creates
      circuits more aggressively than usual until it has enough data
      points for a good timeout estimate. Implements proposal 151.
      We are especially looking for reports (good and bad) from users with
      both EDGE and broadband connections that can move from broadband
      to EDGE and find out if the build-time data in the .tor/state gets
      reset without loss of Tor usability. You should also see a notice
      log message telling you that Tor has reset its timeout.
    - Directory authorities can now vote on arbitary integer values as
      part of the consensus process. This is designed to help set
      network-wide parameters. Implements proposal 167.
    - Tor now reads the "circwindow" parameter out of the consensus,
      and uses that value for its circuit package window rather than the
      default of 1000 cells. Begins the implementation of proposal 168.

  o Major bugfixes:
    - Fix a remotely triggerable memory leak when a consensus document
      contains more than one signature from the same voter. Bugfix on
      0.2.0.3-alpha.

  o Minor bugfixes:
    - Fix an extremely rare infinite recursion bug that could occur if
      we tried to log a message after shutting down the log subsystem.
      Found by Matt Edman. Bugfix on 0.2.0.16-alpha.
    - Fix parsing for memory or time units given without a space between
      the number and the unit. Bugfix on 0.2.2.1-alpha; fixes bug 1076.
    - A networkstatus vote must contain exactly one signature. Spec
      conformance issue. Bugfix on 0.2.0.3-alpha.
    - Fix an obscure bug where hidden services on 64-bit big-endian
      systems might mis-read the timestamp in v3 introduce cells, and
      refuse to connect back to the client. Discovered by "rotor".
      Bugfix on 0.2.1.6-alpha.
    - We were triggering a CLOCK_SKEW controller status event whenever
      we connect via the v2 connection protocol to any relay that has
      a wrong clock. Instead, we should only inform the controller when
      it's a trusted authority that claims our clock is wrong. Bugfix
      on 0.2.0.20-rc; starts to fix bug 1074. Reported by SwissTorExit.
    - We were telling the controller about CHECKING_REACHABILITY and
      REACHABILITY_FAILED status events whenever we launch a testing
      circuit or notice that one has failed. Instead, only tell the
      controller when we want to inform the user of overall success or
      overall failure. Bugfix on 0.1.2.6-alpha. Fixes bug 1075. Reported
      by SwissTorExit.
    - Don't warn when we're using a circuit that ends with a node
      excluded in ExcludeExitNodes, but the circuit is not used to access
      the outside world. This should help fix bug 1090, but more problems
      remain. Bugfix on 0.2.1.6-alpha.
    - Work around a small memory leak in some versions of OpenSSL that
      stopped the memory used by the hostname TLS extension from being
      freed.
    - Make our 'torify' script more portable; if we have only one of
      'torsocks' or 'tsocks' installed, don't complain to the user;
      and explain our warning about tsocks better.

  o Minor features:
    - Add a "getinfo status/accepted-server-descriptor" controller
      command, which is the recommended way for controllers to learn
      whether our server descriptor has been successfully received by at
      least on directory authority. Un-recommend good-server-descriptor
      getinfo and status events until we have a better design for them.
    - Update to the "September 4 2009" ip-to-country file.


Changes in version 0.2.2.1-alpha - 2009-08-26
  Tor 0.2.2.1-alpha disables ".exit" address notation by default, allows
  Tor clients to bootstrap on networks where only port 80 is reachable,
  makes it more straightforward to support hardware crypto accelerators,
  and starts the groundwork for gathering stats safely at relays.

  o Security fixes:
    - Start the process of disabling ".exit" address notation, since it
      can be used for a variety of esoteric application-level attacks
      on users. To reenable it, set "AllowDotExit 1" in your torrc. Fix
      on 0.0.9rc5.

  o New directory authorities:
    - Set up urras (run by Jacob Appelbaum) as the seventh v3 directory
      authority.

  o Major features:
    - New AccelName and AccelDir options add support for dynamic OpenSSL
      hardware crypto acceleration engines.
    - Tor now supports tunneling all of its outgoing connections over
      a SOCKS proxy, using the SOCKS4Proxy and/or SOCKS5Proxy
      configuration options. Code by Christopher Davis.

  o Major bugfixes:
    - Send circuit or stream sendme cells when our window has decreased
      by 100 cells, not when it has decreased by 101 cells. Bug uncovered
      by Karsten when testing the "reduce circuit window" performance
      patch. Bugfix on the 54th commit on Tor -- from July 2002,
      before the release of Tor 0.0.0. This is the new winner of the
      oldest-bug prize.

  o New options for gathering stats safely:
    - Directories that set "DirReqStatistics 1" write statistics on
      directory request to disk every 24 hours. As compared to the
      --enable-geoip-stats flag in 0.2.1.x, there are a few improvements:
      1) stats are written to disk exactly every 24 hours; 2) estimated
      shares of v2 and v3 requests are determined as mean values, not at
      the end of a measurement period; 3) unresolved requests are listed
      with country code '??'; 4) directories also measure download times.
    - Exit nodes that set "ExitPortStatistics 1" write statistics on the
      number of exit streams and transferred bytes per port to disk every
      24 hours.
    - Relays that set "CellStatistics 1" write statistics on how long
      cells spend in their circuit queues to disk every 24 hours.
    - Entry nodes that set "EntryStatistics 1" write statistics on the
      rough number and origins of connecting clients to disk every 24
      hours.
    - Relays that write any of the above statistics to disk and set
      "ExtraInfoStatistics 1" include the past 24 hours of statistics in
      their extra-info documents.

  o Minor features:
    - New --digests command-line switch to output the digests of the
      source files Tor was built with.
    - The "torify" script now uses torsocks where available.
    - The memarea code now uses a sentinel value at the end of each area
      to make sure nothing writes beyond the end of an area. This might
      help debug some conceivable causes of bug 930.
    - Time and memory units in the configuration file can now be set to
      fractional units. For example, "2.5 GB" is now a valid value for
      AccountingMax.
    - Certain Tor clients (such as those behind check.torproject.org) may
      want to fetch the consensus in an extra early manner. To enable this
      a user may now set FetchDirInfoExtraEarly to 1. This also depends on
      setting FetchDirInfoEarly to 1. Previous behavior will stay the same
      as only certain clients who must have this information sooner should
      set this option.
    - Instead of adding the svn revision to the Tor version string, report
      the git commit (when we're building from a git checkout).

  o Minor bugfixes:
    - If any the v3 certs we download are unparseable, we should actually
      notice the failure so we don't retry indefinitely. Bugfix on
      0.2.0.x; reported by "rotator".
    - If the cached cert file is unparseable, warn but don't exit.
    - Fix possible segmentation fault on directory authorities. Bugfix on
      0.2.1.14-rc.
    - When Tor fails to parse a descriptor of any kind, dump it to disk.
      Might help diagnosing bug 1051.

  o Deprecated and removed features:
    - The controller no longer accepts the old obsolete "addr-mappings/"
      or "unregistered-servers-" GETINFO values.
    - Hidden services no longer publish version 0 descriptors, and clients
      do not request or use version 0 descriptors. However, the old hidden
      service authorities still accept and serve version 0 descriptors
      when contacted by older hidden services/clients.
    - The EXTENDED_EVENTS and VERBOSE_NAMES controller features are now
      always on; using them is necessary for correct forward-compatible
      controllers.
    - Remove support for .noconnect style addresses. Nobody was using
      them, and they provided another avenue for detecting Tor users
      via application-level web tricks.

  o Packaging changes:
    - Upgrade Vidalia from 0.1.15 to 0.2.3 in the Windows and OS X
      installer bundles. See
      https://trac.vidalia-project.net/browser/vidalia/tags/vidalia-0.2.3/CHANGELOG
      for details of what's new in Vidalia 0.2.3.
    - Windows Vidalia Bundle: update Privoxy from 3.0.6 to 3.0.14-beta.
    - OS X Vidalia Bundle: move to Polipo 1.0.4 with Tor specific
      configuration file, rather than the old Privoxy.
    - OS X Vidalia Bundle: Vidalia, Tor, and Polipo are compiled as
      x86-only for better compatibility with OS X 10.6, aka Snow Leopard.
    - OS X Tor Expert Bundle: Tor is compiled as x86-only for
      better compatibility with OS X 10.6, aka Snow Leopard.
    - OS X Vidalia Bundle: The multi-package installer is now replaced
      by a simple drag and drop to the /Applications folder. This change
      occurred with the upgrade to Vidalia 0.2.3.


Changes in version 0.2.1.19 - 2009-07-28
  Tor 0.2.1.19 fixes a major bug with accessing and providing hidden
  services on Tor 0.2.1.3-alpha through 0.2.1.18.

  o Major bugfixes:
    - Make accessing hidden services on 0.2.1.x work right again.
      Bugfix on 0.2.1.3-alpha; workaround for bug 1038. Diagnosis and
      part of patch provided by "optimist".

  o Minor features:
    - When a relay/bridge is writing out its identity key fingerprint to
      the "fingerprint" file and to its logs, write it without spaces. Now
      it will look like the fingerprints in our bridges documentation,
      and confuse fewer users.

  o Minor bugfixes:
    - Relays no longer publish a new server descriptor if they change
      their MaxAdvertisedBandwidth config option but it doesn't end up
      changing their advertised bandwidth numbers. Bugfix on 0.2.0.28-rc;
      fixes bug 1026. Patch from Sebastian.
    - Avoid leaking memory every time we get a create cell but we have
      so many already queued that we refuse it. Bugfix on 0.2.0.19-alpha;
      fixes bug 1034. Reported by BarkerJr.


Changes in version 0.2.1.18 - 2009-07-24
  Tor 0.2.1.18 lays the foundations for performance improvements,
  adds status events to help users diagnose bootstrap problems, adds
  optional authentication/authorization for hidden services, fixes a
  variety of potential anonymity problems, and includes a huge pile of
  other features and bug fixes.

  o Build fixes:
    - Add LIBS=-lrt to Makefile.am so the Tor RPMs use a static libevent.


Changes in version 0.2.1.17-rc - 2009-07-07
  Tor 0.2.1.17-rc marks the fourth -- and hopefully last -- release
  candidate for the 0.2.1.x series. It lays the groundwork for further
  client performance improvements, and also fixes a big bug with directory
  authorities that were causing them to assign Guard and Stable flags
  poorly.

  The Windows bundles also finally include the geoip database that we
  thought we'd been shipping since 0.2.0.x (oops), and the OS X bundles
  should actually install Torbutton rather than giving you a cryptic
  failure message (oops).

  o Major features:
    - Clients now use the bandwidth values in the consensus, rather than
      the bandwidth values in each relay descriptor. This approach opens
      the door to more accurate bandwidth estimates once the directory
      authorities start doing active measurements. Implements more of
      proposal 141.

  o Major bugfixes:
    - When Tor clients restart after 1-5 days, they discard all their
      cached descriptors as too old, but they still use the cached
      consensus document. This approach is good for robustness, but
      bad for performance: since they don't know any bandwidths, they
      end up choosing at random rather than weighting their choice by
      speed. Fixed by the above feature of putting bandwidths in the
      consensus. Bugfix on 0.2.0.x.
    - Directory authorities were neglecting to mark relays down in their
      internal histories if the relays fall off the routerlist without
      ever being found unreachable. So there were relays in the histories
      that haven't been seen for eight months, and are listed as being
      up for eight months. This wreaked havoc on the "median wfu"
      and "median mtbf" calculations, in turn making Guard and Stable
      flags very wrong, hurting network performance. Fixes bugs 696 and
      969. Bugfix on 0.2.0.6-alpha.

  o Minor bugfixes:
    - Serve the DirPortFrontPage page even when we have been approaching
      our quotas recently. Fixes bug 1013; bugfix on 0.2.1.8-alpha.
    - The control port would close the connection before flushing long
      replies, such as the network consensus, if a QUIT command was issued
      before the reply had completed. Now, the control port flushes all
      pending replies before closing the connection. Also fixed a spurious
      warning when a QUIT command is issued after a malformed or rejected
      AUTHENTICATE command, but before the connection was closed. Patch
      by Marcus Griep. Bugfix on 0.2.0.x; fixes bugs 1015 and 1016.
    - When we can't find an intro key for a v2 hidden service descriptor,
      fall back to the v0 hidden service descriptor and log a bug message.
      Workaround for bug 1024.
    - Fix a log message that did not respect the SafeLogging option.
      Resolves bug 1027.

  o Minor features:
    - If we're a relay and we change our IP address, be more verbose
      about the reason that made us change. Should help track down
      further bugs for relays on dynamic IP addresses.


Changes in version 0.2.0.35 - 2009-06-24
  o Security fix:
    - Avoid crashing in the presence of certain malformed descriptors.
      Found by lark, and by automated fuzzing.
    - Fix an edge case where a malicious exit relay could convince a
      controller that the client's DNS question resolves to an internal IP
      address. Bug found and fixed by "optimist"; bugfix on 0.1.2.8-beta.

  o Major bugfixes:
    - Finally fix the bug where dynamic-IP relays disappear when their
      IP address changes: directory mirrors were mistakenly telling
      them their old address if they asked via begin_dir, so they
      never got an accurate answer about their new address, so they
      just vanished after a day. For belt-and-suspenders, relays that
      don't set Address in their config now avoid using begin_dir for
      all direct connections. Should fix bugs 827, 883, and 900.
    - Fix a timing-dependent, allocator-dependent, DNS-related crash bug
      that would occur on some exit nodes when DNS failures and timeouts
      occurred in certain patterns. Fix for bug 957.

  o Minor bugfixes:
    - When starting with a cache over a few days old, do not leak
      memory for the obsolete router descriptors in it. Bugfix on
      0.2.0.33; fixes bug 672.
    - Hidden service clients didn't use a cached service descriptor that
      was older than 15 minutes, but wouldn't fetch a new one either,
      because there was already one in the cache. Now, fetch a v2
      descriptor unless the same descriptor was added to the cache within
      the last 15 minutes. Fixes bug 997; reported by Marcus Griep.


Changes in version 0.2.1.16-rc - 2009-06-20
  Tor 0.2.1.16-rc speeds up performance for fast exit relays, and fixes
  a bunch of minor bugs.

  o Security fixes:
    - Fix an edge case where a malicious exit relay could convince a
      controller that the client's DNS question resolves to an internal IP
      address. Bug found and fixed by "optimist"; bugfix on 0.1.2.8-beta.

  o Major performance improvements (on 0.2.0.x):
    - Disable and refactor some debugging checks that forced a linear scan
      over the whole server-side DNS cache. These accounted for over 50%
      of CPU time on a relatively busy exit node's gprof profile. Found
      by Jacob.
    - Disable some debugging checks that appeared in exit node profile
      data.

  o Minor features:
    - Update to the "June 3 2009" ip-to-country file.
    - Do not have tor-resolve automatically refuse all .onion addresses;
      if AutomapHostsOnResolve is set in your torrc, this will work fine.

  o Minor bugfixes (on 0.2.0.x):
    - Log correct error messages for DNS-related network errors on
      Windows.
    - Fix a race condition that could cause crashes or memory corruption
      when running as a server with a controller listening for log
      messages.
    - Avoid crashing when we have a policy specified in a DirPolicy or
      SocksPolicy or ReachableAddresses option with ports set on it,
      and we re-load the policy. May fix bug 996.
    - Hidden service clients didn't use a cached service descriptor that
      was older than 15 minutes, but wouldn't fetch a new one either,
      because there was already one in the cache. Now, fetch a v2
      descriptor unless the same descriptor was added to the cache within
      the last 15 minutes. Fixes bug 997; reported by Marcus Griep.

  o Minor bugfixes (on 0.2.1.x):
    - Don't warn users about low port and hibernation mix when they
      provide a *ListenAddress directive to fix that. Bugfix on
      0.2.1.15-rc.
    - When switching back and forth between bridge mode, do not start
      gathering GeoIP data until two hours have passed.
    - Do not complain that the user has requested an excluded node as
      an exit when the node is not really an exit. This could happen
      because the circuit was for testing, or an introduction point.
      Fix for bug 984.


Changes in version 0.2.1.15-rc - 2009-05-25
  Tor 0.2.1.15-rc marks the second release candidate for the 0.2.1.x
  series. It fixes a major bug on fast exit relays, as well as a variety
  of more minor bugs.

  o Major bugfixes (on 0.2.0.x):
    - Fix a timing-dependent, allocator-dependent, DNS-related crash bug
      that would occur on some exit nodes when DNS failures and timeouts
      occurred in certain patterns. Fix for bug 957.

  o Minor bugfixes (on 0.2.0.x):
    - Actually return -1 in the error case for read_bandwidth_usage().
      Harmless bug, since we currently don't care about the return value
      anywhere. Bugfix on 0.2.0.9-alpha.
    - Provide a more useful log message if bug 977 (related to buffer
      freelists) ever reappears, and do not crash right away.
    - Fix an assertion failure on 64-bit platforms when we allocated
      memory right up to the end of a memarea, then realigned the memory
      one step beyond the end. Fixes a possible cause of bug 930.
    - Protect the count of open sockets with a mutex, so we can't
      corrupt it when two threads are closing or opening sockets at once.
      Fix for bug 939. Bugfix on 0.2.0.1-alpha.
    - Don't allow a bridge to publish its router descriptor to a
      non-bridge directory authority. Fixes part of bug 932.
    - When we change to or from being a bridge, reset our counts of
      client usage by country. Fixes bug 932.
    - Fix a bug that made stream bandwidth get misreported to the
      controller.
    - Stop using malloc_usable_size() to use more area than we had
      actually allocated: it was safe, but made valgrind really unhappy.
    - Fix a memory leak when v3 directory authorities load their keys
      and cert from disk. Bugfix on 0.2.0.1-alpha.

  o Minor bugfixes (on 0.2.1.x):
    - Fix use of freed memory when deciding to mark a non-addable
      descriptor as never-downloadable. Bugfix on 0.2.1.9-alpha.


Changes in version 0.2.1.14-rc - 2009-04-12
  Tor 0.2.1.14-rc marks the first release candidate for the 0.2.1.x
  series. It begins fixing some major performance problems, and also
  finally addresses the bug that was causing relays on dynamic IP
  addresses to fall out of the directory.

  o Major features:
    - Clients replace entry guards that were chosen more than a few months
      ago. This change should significantly improve client performance,
      especially once more people upgrade, since relays that have been
      a guard for a long time are currently overloaded.

  o Major bugfixes (on 0.2.0):
    - Finally fix the bug where dynamic-IP relays disappear when their
      IP address changes: directory mirrors were mistakenly telling
      them their old address if they asked via begin_dir, so they
      never got an accurate answer about their new address, so they
      just vanished after a day. For belt-and-suspenders, relays that
      don't set Address in their config now avoid using begin_dir for
      all direct connections. Should fix bugs 827, 883, and 900.
    - Relays were falling out of the networkstatus consensus for
      part of a day if they changed their local config but the
      authorities discarded their new descriptor as "not sufficiently
      different". Now directory authorities accept a descriptor as changed
      if bandwidthrate or bandwidthburst changed. Partial fix for bug 962;
      patch by Sebastian.
    - Avoid crashing in the presence of certain malformed descriptors.
      Found by lark, and by automated fuzzing.

  o Minor features:
    - When generating circuit events with verbose nicknames for
      controllers, try harder to look up nicknames for routers on a
      circuit. (Previously, we would look in the router descriptors we had
      for nicknames, but not in the consensus.) Partial fix for bug 941.
    - If the bridge config line doesn't specify a port, assume 443.
      This makes bridge lines a bit smaller and easier for users to
      understand.
    - Raise the minimum bandwidth to be a relay from 20000 bytes to 20480
      bytes (aka 20KB/s), to match our documentation. Also update
      directory authorities so they always assign the Fast flag to relays
      with 20KB/s of capacity. Now people running relays won't suddenly
      find themselves not seeing any use, if the network gets faster
      on average.
    - Update to the "April 3 2009" ip-to-country file.

  o Minor bugfixes:
    - Avoid trying to print raw memory to the logs when we decide to
      give up on downloading a given relay descriptor. Bugfix on
      0.2.1.9-alpha.
    - In tor-resolve, when the Tor client to use is specified by
      <hostname>:<port>, actually use the specified port rather than
      defaulting to 9050. Bugfix on 0.2.1.6-alpha.
    - Make directory usage recording work again. Bugfix on 0.2.1.6-alpha.
    - When starting with a cache over a few days old, do not leak
      memory for the obsolete router descriptors in it. Bugfix on
      0.2.0.33.
    - Avoid double-free on list of successfully uploaded hidden
      service discriptors. Fix for bug 948. Bugfix on 0.2.1.6-alpha.
    - Change memarea_strndup() implementation to work even when
      duplicating a string at the end of a page. This bug was
      harmless for now, but could have meant crashes later. Fix by
      lark. Bugfix on 0.2.1.1-alpha.
    - Limit uploaded directory documents to be 16M rather than 500K.
      The directory authorities were refusing v3 consensus votes from
      other authorities, since the votes are now 504K. Fixes bug 959;
      bugfix on 0.0.2pre17 (where we raised it from 50K to 500K ;).
    - Directory authorities should never send a 503 "busy" response to
      requests for votes or keys. Bugfix on 0.2.0.8-alpha; exposed by
      bug 959.


Changes in version 0.2.1.13-alpha - 2009-03-09
  Tor 0.2.1.13-alpha includes another big pile of minor bugfixes and
  cleanups. We're finally getting close to a release candidate.

  o Major bugfixes:
    - Correctly update the list of which countries we exclude as
      exits, when the GeoIP file is loaded or reloaded. Diagnosed by
      lark. Bugfix on 0.2.1.6-alpha.

  o Minor bugfixes (on 0.2.0.x and earlier):
    - Automatically detect MacOSX versions earlier than 10.4.0, and
      disable kqueue from inside Tor when running with these versions.
      We previously did this from the startup script, but that was no
      help to people who didn't use the startup script. Resolves bug 863.
    - When we had picked an exit node for a connection, but marked it as
      "optional", and it turned out we had no onion key for the exit,
      stop wanting that exit and try again. This situation may not
      be possible now, but will probably become feasible with proposal
      158. Spotted by rovv. Fixes another case of bug 752.
    - Clients no longer cache certificates for authorities they do not
      recognize. Bugfix on 0.2.0.9-alpha.
    - When we can't transmit a DNS request due to a network error, retry
      it after a while, and eventually transmit a failing response to
      the RESOLVED cell. Bugfix on 0.1.2.5-alpha.
    - If the controller claimed responsibility for a stream, but that
      stream never finished making its connection, it would live
      forever in circuit_wait state. Now we close it after SocksTimeout
      seconds. Bugfix on 0.1.2.7-alpha; reported by Mike Perry.
    - Drop begin cells to a hidden service if they come from the middle
      of a circuit. Patch from lark.
    - When we erroneously receive two EXTEND cells for the same circuit
      ID on the same connection, drop the second. Patch from lark.
    - Fix a crash that occurs on exit nodes when a nameserver request
      timed out. Bugfix on 0.1.2.1-alpha; our CLEAR debugging code had
      been suppressing the bug since 0.1.2.10-alpha. Partial fix for
      bug 929.
    - Do not assume that a stack-allocated character array will be
      64-bit aligned on platforms that demand that uint64_t access is
      aligned. Possible fix for bug 604.
    - Parse dates and IPv4 addresses in a locale- and libc-independent
      manner, to avoid platform-dependent behavior on malformed input.
    - Build correctly when configured to build outside the main source
      path. Patch from Michael Gold.
    - We were already rejecting relay begin cells with destination port
      of 0. Now also reject extend cells with destination port or address
      of 0. Suggested by lark.

  o Minor bugfixes (on 0.2.1.x):
    - Don't re-extend introduction circuits if we ran out of RELAY_EARLY
      cells. Bugfix on 0.2.1.3-alpha. Fixes more of bug 878.
    - If we're an exit node, scrub the IP address to which we are exiting
      in the logs. Bugfix on 0.2.1.8-alpha.

  o Minor features:
    - On Linux, use the prctl call to re-enable core dumps when the user
      is option is set.
    - New controller event NEWCONSENSUS that lists the networkstatus
      lines for every recommended relay. Now controllers like Torflow
      can keep up-to-date on which relays they should be using.
    - Update to the "February 26 2009" ip-to-country file.


Changes in version 0.2.0.34 - 2009-02-08
  Tor 0.2.0.34 features several more security-related fixes. You should
  upgrade, especially if you run an exit relay (remote crash) or a
  directory authority (remote infinite loop), or you're on an older
  (pre-XP) or not-recently-patched Windows (remote exploit).

  This release marks end-of-life for Tor 0.1.2.x. Those Tor versions
  have many known flaws, and nobody should be using them. You should
  upgrade. If you're using a Linux or BSD and its packages are obsolete,
  stop using those packages and upgrade anyway.

  o Security fixes:
    - Fix an infinite-loop bug on handling corrupt votes under certain
      circumstances. Bugfix on 0.2.0.8-alpha.
    - Fix a temporary DoS vulnerability that could be performed by
      a directory mirror. Bugfix on 0.2.0.9-alpha; reported by lark.
    - Avoid a potential crash on exit nodes when processing malformed
      input. Remote DoS opportunity. Bugfix on 0.2.0.33.
    - Do not accept incomplete ipv4 addresses (like 192.168.0) as valid.
      Spec conformance issue. Bugfix on Tor 0.0.2pre27.

  o Minor bugfixes:
    - Fix compilation on systems where time_t is a 64-bit integer.
      Patch from Matthias Drochner.
    - Don't consider expiring already-closed client connections. Fixes
      bug 893. Bugfix on 0.0.2pre20.


Changes in version 0.2.1.12-alpha - 2009-02-08
  Tor 0.2.1.12-alpha features several more security-related fixes. You
  should upgrade, especially if you run an exit relay (remote crash) or
  a directory authority (remote infinite loop), or you're on an older
  (pre-XP) or not-recently-patched Windows (remote exploit). It also
  includes a big pile of minor bugfixes and cleanups.

  o Security fixes:
    - Fix an infinite-loop bug on handling corrupt votes under certain
      circumstances. Bugfix on 0.2.0.8-alpha.
    - Fix a temporary DoS vulnerability that could be performed by
      a directory mirror. Bugfix on 0.2.0.9-alpha; reported by lark.
    - Avoid a potential crash on exit nodes when processing malformed
      input. Remote DoS opportunity. Bugfix on 0.2.1.7-alpha.

  o Minor bugfixes:
    - Let controllers actually ask for the "clients_seen" event for
      getting usage summaries on bridge relays. Bugfix on 0.2.1.10-alpha;
      reported by Matt Edman.
    - Fix a compile warning on OSX Panther. Fixes bug 913; bugfix against
      0.2.1.11-alpha.
    - Fix a bug in address parsing that was preventing bridges or hidden
      service targets from being at IPv6 addresses.
    - Solve a bug that kept hardware crypto acceleration from getting
      enabled when accounting was turned on. Fixes bug 907. Bugfix on
      0.0.9pre6.
    - Remove a bash-ism from configure.in to build properly on non-Linux
      platforms. Bugfix on 0.2.1.1-alpha.
    - Fix code so authorities _actually_ send back X-Descriptor-Not-New
      headers. Bugfix on 0.2.0.10-alpha.
    - Don't consider expiring already-closed client connections. Fixes
      bug 893. Bugfix on 0.0.2pre20.
    - Fix another interesting corner-case of bug 891 spotted by rovv:
      Previously, if two hosts had different amounts of clock drift, and
      one of them created a new connection with just the wrong timing,
      the other might decide to deprecate the new connection erroneously.
      Bugfix on 0.1.1.13-alpha.
    - Resolve a very rare crash bug that could occur when the user forced
      a nameserver reconfiguration during the middle of a nameserver
      probe. Fixes bug 526. Bugfix on 0.1.2.1-alpha.
    - Support changing value of ServerDNSRandomizeCase during SIGHUP.
      Bugfix on 0.2.1.7-alpha.
    - If we're using bridges and our network goes away, be more willing
      to forgive our bridges and try again when we get an application
      request. Bugfix on 0.2.0.x.

  o Minor features:
    - Support platforms where time_t is 64 bits long. (Congratulations,
      NetBSD!) Patch from Matthias Drochner.
    - Add a 'getinfo status/clients-seen' controller command, in case
      controllers want to hear clients_seen events but connect late.

  o Build changes:
    - Disable GCC's strict alias optimization by default, to avoid the
      likelihood of its introducing subtle bugs whenever our code violates
      the letter of C99's alias rules.


Changes in version 0.2.0.33 - 2009-01-21
  Tor 0.2.0.33 fixes a variety of bugs that were making relays less
  useful to users. It also finally fixes a bug where a relay or client
  that's been off for many days would take a long time to bootstrap.

  This update also fixes an important security-related bug reported by
  Ilja van Sprundel. You should upgrade. (We'll send out more details
  about the bug once people have had some time to upgrade.)

  o Security fixes:
    - Fix a heap-corruption bug that may be remotely triggerable on
      some platforms. Reported by Ilja van Sprundel.

  o Major bugfixes:
    - When a stream at an exit relay is in state "resolving" or
      "connecting" and it receives an "end" relay cell, the exit relay
      would silently ignore the end cell and not close the stream. If
      the client never closes the circuit, then the exit relay never
      closes the TCP connection. Bug introduced in Tor 0.1.2.1-alpha;
      reported by "wood".
    - When sending CREATED cells back for a given circuit, use a 64-bit
      connection ID to find the right connection, rather than an addr:port
      combination. Now that we can have multiple OR connections between
      the same ORs, it is no longer possible to use addr:port to uniquely
      identify a connection.
    - Bridge relays that had DirPort set to 0 would stop fetching
      descriptors shortly after startup, and then briefly resume
      after a new bandwidth test and/or after publishing a new bridge
      descriptor. Bridge users that try to bootstrap from them would
      get a recent networkstatus but would get descriptors from up to
      18 hours earlier, meaning most of the descriptors were obsolete
      already. Reported by Tas; bugfix on 0.2.0.13-alpha.
    - Prevent bridge relays from serving their 'extrainfo' document
      to anybody who asks, now that extrainfo docs include potentially
      sensitive aggregated client geoip summaries. Bugfix on
      0.2.0.13-alpha.
    - If the cached networkstatus consensus is more than five days old,
      discard it rather than trying to use it. In theory it could be
      useful because it lists alternate directory mirrors, but in practice
      it just means we spend many minutes trying directory mirrors that
      are long gone from the network. Also discard router descriptors as
      we load them if they are more than five days old, since the onion
      key is probably wrong by now. Bugfix on 0.2.0.x. Fixes bug 887.

  o Minor bugfixes:
    - Do not mark smartlist_bsearch_idx() function as ATTR_PURE. This bug
      could make gcc generate non-functional binary search code. Bugfix
      on 0.2.0.10-alpha.
    - Build correctly on platforms without socklen_t.
    - Compile without warnings on solaris.
    - Avoid potential crash on internal error during signature collection.
      Fixes bug 864. Patch from rovv.
    - Correct handling of possible malformed authority signing key
      certificates with internal signature types. Fixes bug 880.
      Bugfix on 0.2.0.3-alpha.
    - Fix a hard-to-trigger resource leak when logging credential status.
      CID 349.
    - When we can't initialize DNS because the network is down, do not
      automatically stop Tor from starting. Instead, we retry failed
      dns_init() every 10 minutes, and change the exit policy to reject
      *:* until one succeeds. Fixes bug 691.
    - Use 64 bits instead of 32 bits for connection identifiers used with
      the controller protocol, to greatly reduce risk of identifier reuse.
    - When we're choosing an exit node for a circuit, and we have
      no pending streams, choose a good general exit rather than one that
      supports "all the pending streams". Bugfix on 0.1.1.x. Fix by rovv.
    - Fix another case of assuming, when a specific exit is requested,
      that we know more than the user about what hosts it allows.
      Fixes one case of bug 752. Patch from rovv.
    - Clip the MaxCircuitDirtiness config option to a minimum of 10
      seconds. Warn the user if lower values are given in the
      configuration. Bugfix on 0.1.0.1-rc. Patch by Sebastian.
    - Clip the CircuitBuildTimeout to a minimum of 30 seconds. Warn the
      user if lower values are given in the configuration. Bugfix on
      0.1.1.17-rc. Patch by Sebastian.
    - Fix a memory leak when we decline to add a v2 rendezvous descriptor to
      the cache because we already had a v0 descriptor with the same ID.
      Bugfix on 0.2.0.18-alpha.
    - Fix a race condition when freeing keys shared between main thread
      and CPU workers that could result in a memory leak. Bugfix on
      0.1.0.1-rc. Fixes bug 889.
    - Send a valid END cell back when a client tries to connect to a
      nonexistent hidden service port. Bugfix on 0.1.2.15. Fixes bug
      840. Patch from rovv.
    - Check which hops rendezvous stream cells are associated with to
      prevent possible guess-the-streamid injection attacks from
      intermediate hops. Fixes another case of bug 446. Based on patch
      from rovv.
    - If a broken client asks a non-exit router to connect somewhere,
      do not even do the DNS lookup before rejecting the connection.
      Fixes another case of bug 619. Patch from rovv.
    - When a relay gets a create cell it can't decrypt (e.g. because it's
      using the wrong onion key), we were dropping it and letting the
      client time out. Now actually answer with a destroy cell. Fixes
      bug 904. Bugfix on 0.0.2pre8.

  o Minor bugfixes (hidden services):
    - Do not throw away existing introduction points on SIGHUP. Bugfix on
      0.0.6pre1. Patch by Karsten. Fixes bug 874.

  o Minor features:
    - Report the case where all signatures in a detached set are rejected
      differently than the case where there is an error handling the
      detached set.
    - When we realize that another process has modified our cached
      descriptors, print out a more useful error message rather than
      triggering an assertion. Fixes bug 885. Patch from Karsten.
    - Implement the 0x20 hack to better resist DNS poisoning: set the
      case on outgoing DNS requests randomly, and reject responses that do
      not match the case correctly. This logic can be disabled with the
      ServerDNSRamdomizeCase setting, if you are using one of the 0.3%
      of servers that do not reliably preserve case in replies. See
      "Increased DNS Forgery Resistance through 0x20-Bit Encoding"
      for more info.
    - Check DNS replies for more matching fields to better resist DNS
      poisoning.
    - Never use OpenSSL compression: it wastes RAM and CPU trying to
      compress cells, which are basically all encrypted, compressed, or
      both.


Changes in version 0.2.1.11-alpha - 2009-01-20
  Tor 0.2.1.11-alpha finishes fixing the "if your Tor is off for a
  week it will take a long time to bootstrap again" bug. It also fixes
  an important security-related bug reported by Ilja van Sprundel. You
  should upgrade. (We'll send out more details about the bug once people
  have had some time to upgrade.)

  o Security fixes:
    - Fix a heap-corruption bug that may be remotely triggerable on
      some platforms. Reported by Ilja van Sprundel.

  o Major bugfixes:
    - Discard router descriptors as we load them if they are more than
      five days old. Otherwise if Tor is off for a long time and then
      starts with cached descriptors, it will try to use the onion
      keys in those obsolete descriptors when building circuits. Bugfix
      on 0.2.0.x. Fixes bug 887.

  o Minor features:
    - Try to make sure that the version of Libevent we're running with
      is binary-compatible with the one we built with. May address bug
      897 and others.
    - Make setting ServerDNSRandomizeCase to 0 actually work. Bugfix
      for bug 905. Bugfix on 0.2.1.7-alpha.
    - Add a new --enable-local-appdata configuration switch to change
      the default location of the datadir on win32 from APPDATA to
      LOCAL_APPDATA. In the future, we should migrate to LOCAL_APPDATA
      entirely. Patch from coderman.

  o Minor bugfixes:
    - Make outbound DNS packets respect the OutboundBindAddress setting.
      Fixes the bug part of bug 798. Bugfix on 0.1.2.2-alpha.
    - When our circuit fails at the first hop (e.g. we get a destroy
      cell back), avoid using that OR connection anymore, and also
      tell all the one-hop directory requests waiting for it that they
      should fail. Bugfix on 0.2.1.3-alpha.
    - In the torify(1) manpage, mention that tsocks will leak your
      DNS requests.


Changes in version 0.2.1.10-alpha - 2009-01-06
  Tor 0.2.1.10-alpha fixes two major bugs in bridge relays (one that
  would make the bridge relay not so useful if it had DirPort set to 0,
  and one that could let an attacker learn a little bit of information
  about the bridge's users), and a bug that would cause your Tor relay
  to ignore a circuit create request it can't decrypt (rather than reply
  with an error). It also fixes a wide variety of other bugs.

  o Major bugfixes:
    - If the cached networkstatus consensus is more than five days old,
      discard it rather than trying to use it. In theory it could
      be useful because it lists alternate directory mirrors, but in
      practice it just means we spend many minutes trying directory
      mirrors that are long gone from the network. Helps bug 887 a bit;
      bugfix on 0.2.0.x.
    - Bridge relays that had DirPort set to 0 would stop fetching
      descriptors shortly after startup, and then briefly resume
      after a new bandwidth test and/or after publishing a new bridge
      descriptor. Bridge users that try to bootstrap from them would
      get a recent networkstatus but would get descriptors from up to
      18 hours earlier, meaning most of the descriptors were obsolete
      already. Reported by Tas; bugfix on 0.2.0.13-alpha.
    - Prevent bridge relays from serving their 'extrainfo' document
      to anybody who asks, now that extrainfo docs include potentially
      sensitive aggregated client geoip summaries. Bugfix on
      0.2.0.13-alpha.

  o Minor features:
    - New controller event "clients_seen" to report a geoip-based summary
      of which countries we've seen clients from recently. Now controllers
      like Vidalia can show bridge operators that they're actually making
      a difference.
    - Build correctly against versions of OpenSSL 0.9.8 or later built
      without support for deprecated functions.
    - Update to the "December 19 2008" ip-to-country file.

  o Minor bugfixes (on 0.2.0.x):
    - Authorities now vote for the Stable flag for any router whose
      weighted MTBF is at least 5 days, regardless of the mean MTBF.
    - Do not remove routers as too old if we do not have any consensus
      document. Bugfix on 0.2.0.7-alpha.
    - Do not accept incomplete ipv4 addresses (like 192.168.0) as valid.
      Spec conformance issue. Bugfix on Tor 0.0.2pre27.
    - When an exit relay resolves a stream address to a local IP address,
      do not just keep retrying that same exit relay over and
      over. Instead, just close the stream. Addresses bug 872. Bugfix
      on 0.2.0.32. Patch from rovv.
    - If a hidden service sends us an END cell, do not consider
      retrying the connection; just close it. Patch from rovv.
    - When we made bridge authorities stop serving bridge descriptors over
      unencrypted links, we also broke DirPort reachability testing for
      bridges. So bridges with a non-zero DirPort were printing spurious
      warns to their logs. Bugfix on 0.2.0.16-alpha. Fixes bug 709.
    - When a relay gets a create cell it can't decrypt (e.g. because it's
      using the wrong onion key), we were dropping it and letting the
      client time out. Now actually answer with a destroy cell. Fixes
      bug 904. Bugfix on 0.0.2pre8.
    - Squeeze 2-5% out of client performance (according to oprofile) by
      improving the implementation of some policy-manipulation functions.

  o Minor bugfixes (on 0.2.1.x):
    - Make get_interface_address() function work properly again; stop
      guessing the wrong parts of our address as our address.
    - Do not cannibalize a circuit if we're out of RELAY_EARLY cells to
      send on that circuit. Otherwise we might violate the proposal-110
      limit. Bugfix on 0.2.1.3-alpha. Partial fix for bug 878. Diagnosis
      thanks to Karsten.
    - When we're sending non-EXTEND cells to the first hop in a circuit,
      for example to use an encrypted directory connection, we don't need
      to use RELAY_EARLY cells: the first hop knows what kind of cell
      it is, and nobody else can even see the cell type. Conserving
      RELAY_EARLY cells makes it easier to cannibalize circuits like
      this later.
    - Stop logging nameserver addresses in reverse order.
    - If we are retrying a directory download slowly over and over, do
      not automatically give up after the 254th failure. Bugfix on
      0.2.1.9-alpha.
    - Resume reporting accurate "stream end" reasons to the local control
      port. They were lost in the changes for Proposal 148. Bugfix on
      0.2.1.9-alpha.

  o Deprecated and removed features:
    - The old "tor --version --version" command, which would print out
      the subversion "Id" of most of the source files, is now removed. It
      turned out to be less useful than we'd expected, and harder to
      maintain.

  o Code simplifications and refactoring:
    - Change our header file guard macros to be less likely to conflict
      with system headers. Adam Langley noticed that we were conflicting
      with log.h on Android.
    - Tool-assisted documentation cleanup. Nearly every function or
      static variable in Tor should have its own documentation now.


Changes in version 0.2.1.9-alpha - 2008-12-25
  Tor 0.2.1.9-alpha fixes many more bugs, some of them security-related.

  o New directory authorities:
    - gabelmoo (the authority run by Karsten Loesing) now has a new
      IP address.

  o Security fixes:
    - Never use a connection with a mismatched address to extend a
      circuit, unless that connection is canonical. A canonical
      connection is one whose address is authenticated by the router's
      identity key, either in a NETINFO cell or in a router descriptor.
    - Avoid a possible memory corruption bug when receiving hidden service
      descriptors. Bugfix on 0.2.1.6-alpha.

  o Major bugfixes:
    - Fix a logic error that would automatically reject all but the first
      configured DNS server. Bugfix on 0.2.1.5-alpha. Possible fix for
      part of bug 813/868. Bug spotted by coderman.
    - When a stream at an exit relay is in state "resolving" or
      "connecting" and it receives an "end" relay cell, the exit relay
      would silently ignore the end cell and not close the stream. If
      the client never closes the circuit, then the exit relay never
      closes the TCP connection. Bug introduced in 0.1.2.1-alpha;
      reported by "wood".
    - When we can't initialize DNS because the network is down, do not
      automatically stop Tor from starting. Instead, retry failed
      dns_init() every 10 minutes, and change the exit policy to reject
      *:* until one succeeds. Fixes bug 691.

  o Minor features:
    - Give a better error message when an overzealous init script says
      "sudo -u username tor --user username". Makes Bug 882 easier for
      users to diagnose.
    - When a directory authority gives us a new guess for our IP address,
      log which authority we used. Hopefully this will help us debug
      the recent complaints about bad IP address guesses.
    - Detect svn revision properly when we're using git-svn.
    - Try not to open more than one descriptor-downloading connection
      to an authority at once. This should reduce load on directory
      authorities. Fixes bug 366.
    - Add cross-certification to newly generated certificates, so that
      a signing key is enough information to look up a certificate.
      Partial implementation of proposal 157.
    - Start serving certificates by <identity digest, signing key digest>
      pairs. Partial implementation of proposal 157.
    - Clients now never report any stream end reason except 'MISC'.
      Implements proposal 148.
    - On platforms with a maximum syslog string length, truncate syslog
      messages to that length ourselves, rather than relying on the
      system to do it for us.
    - Optimize out calls to time(NULL) that occur for every IO operation,
      or for every cell. On systems where time() is a slow syscall,
      this fix will be slightly helpful.
    - Exit servers can now answer resolve requests for ip6.arpa addresses.
    - When we download a descriptor that we then immediately (as
      a directory authority) reject, do not retry downloading it right
      away. Should save some bandwidth on authorities. Fix for bug
      888. Patch by Sebastian Hahn.
    - When a download gets us zero good descriptors, do not notify
      Tor that new directory information has arrived.
    - Avoid some nasty corner cases in the logic for marking connections
      as too old or obsolete or noncanonical for circuits.  Partial
      bugfix on bug 891.

  o Minor features (controller):
    - New CONSENSUS_ARRIVED event to note when a new consensus has
      been fetched and validated.
    - When we realize that another process has modified our cached
      descriptors file, print out a more useful error message rather
      than triggering an assertion. Fixes bug 885. Patch from Karsten.
    - Add an internal-use-only __ReloadTorrcOnSIGHUP option for
      controllers to prevent SIGHUP from reloading the
      configuration. Fixes bug 856.

  o Minor bugfixes:
    - Resume using the correct "REASON=" stream when telling the
      controller why we closed a stream. Bugfix in 0.2.1.1-alpha.
    - When a canonical connection appears later in our internal list
      than a noncanonical one for a given OR ID, always use the
      canonical one. Bugfix on 0.2.0.12-alpha. Fixes bug 805.
      Spotted by rovv.
    - Clip the MaxCircuitDirtiness config option to a minimum of 10
      seconds. Warn the user if lower values are given in the
      configuration. Bugfix on 0.1.0.1-rc. Patch by Sebastian.
    - Clip the CircuitBuildTimeout to a minimum of 30 seconds. Warn the
      user if lower values are given in the configuration. Bugfix on
      0.1.1.17-rc. Patch by Sebastian.
    - Fix a race condition when freeing keys shared between main thread
      and CPU workers that could result in a memory leak. Bugfix on
      0.1.0.1-rc. Fixes bug 889.

  o Minor bugfixes (hidden services):
    - Do not throw away existing introduction points on SIGHUP (bugfix on
      0.0.6pre1); also, do not stall hidden services because we're
      throwing away introduction points; bugfix on 0.2.1.7-alpha. Spotted
      by John Brooks. Patch by Karsten. Fixes bug 874.
    - Fix a memory leak when we decline to add a v2 rendezvous
      descriptor to the cache because we already had a v0 descriptor
      with the same ID. Bugfix on 0.2.0.18-alpha.

  o Deprecated and removed features:
    - RedirectExits has been removed. It was deprecated since
      0.2.0.3-alpha.
    - Finally remove deprecated "EXTENDED_FORMAT" controller feature. It
      has been called EXTENDED_EVENTS since 0.1.2.4-alpha.
    - Cell pools are now always enabled; --disable-cell-pools is ignored.

  o Code simplifications and refactoring:
    - Rename the confusing or_is_obsolete field to the more appropriate
      is_bad_for_new_circs, and move it to or_connection_t where it
      belongs.
    - Move edge-only flags from connection_t to edge_connection_t: not
      only is this better coding, but on machines of plausible alignment,
      it should save 4-8 bytes per connection_t. "Every little bit helps."
    - Rename ServerDNSAllowBrokenResolvConf to ServerDNSAllowBrokenConfig
      for consistency; keep old option working for backward compatibility.
    - Simplify the code for finding connections to use for a circuit.


Changes in version 0.2.1.8-alpha - 2008-12-08
  Tor 0.2.1.8-alpha fixes some crash bugs in earlier alpha releases,
  builds better on unusual platforms like Solaris and old OS X, and
  fixes a variety of other issues.

  o Major features:
    - New DirPortFrontPage option that takes an html file and publishes
      it as "/" on the DirPort. Now relay operators can provide a
      disclaimer without needing to set up a separate webserver. There's
      a sample disclaimer in contrib/tor-exit-notice.html.

  o Security fixes:
    - When the client is choosing entry guards, now it selects at most
      one guard from a given relay family. Otherwise we could end up with
      all of our entry points into the network run by the same operator.
      Suggested by Camilo Viecco. Fix on 0.1.1.11-alpha.

  o Major bugfixes:
    - Fix a DOS opportunity during the voting signature collection process
      at directory authorities. Spotted by rovv. Bugfix on 0.2.0.x.
    - Fix a possible segfault when establishing an exit connection. Bugfix
      on 0.2.1.5-alpha.

  o Minor bugfixes:
    - Get file locking working on win32. Bugfix on 0.2.1.6-alpha. Fixes
      bug 859.
    - Made Tor a little less aggressive about deleting expired
      certificates. Partial fix for bug 854.
    - Stop doing unaligned memory access that generated bus errors on
      sparc64. Bugfix on 0.2.0.10-alpha. Fix for bug 862.
    - Fix a crash bug when changing EntryNodes from the controller. Bugfix
      on 0.2.1.6-alpha. Fix for bug 867. Patched by Sebastian.
    - Make USR2 log-level switch take effect immediately. Bugfix on
      0.1.2.8-beta.
    - If one win32 nameserver fails to get added, continue adding the
      rest, and don't automatically fail.
    - Use fcntl() for locking when flock() is not available. Should fix
      compilation on Solaris. Should fix Bug 873. Bugfix on 0.2.1.6-alpha.
    - Do not mark smartlist_bsearch_idx() function as ATTR_PURE. This bug
      could make gcc generate non-functional binary search code. Bugfix
      on 0.2.0.10-alpha.
    - Build correctly on platforms without socklen_t.
    - Avoid potential crash on internal error during signature collection.
      Fixes bug 864. Patch from rovv.
    - Do not use C's stdio library for writing to log files. This will
      improve logging performance by a minute amount, and will stop
      leaking fds when our disk is full. Fixes bug 861.
    - Stop erroneous use of O_APPEND in cases where we did not in fact
      want to re-seek to the end of a file before every last write().
    - Correct handling of possible malformed authority signing key
      certificates with internal signature types. Fixes bug 880. Bugfix
      on 0.2.0.3-alpha.
    - Fix a hard-to-trigger resource leak when logging credential status.
      CID 349.

  o Minor features:
    - Directory mirrors no longer fetch the v1 directory or
      running-routers files. They are obsolete, and nobody asks for them
      anymore. This is the first step to making v1 authorities obsolete.

  o Minor features (controller):
    - Return circuit purposes in response to GETINFO circuit-status. Fixes
      bug 858.


Changes in version 0.2.0.32 - 2008-11-20
  Tor 0.2.0.32 fixes a major security problem in Debian and Ubuntu
  packages (and maybe other packages) noticed by Theo de Raadt, fixes
  a smaller security flaw that might allow an attacker to access local
  services, further improves hidden service performance, and fixes a
  variety of other issues.

  o Security fixes:
    - The "User" and "Group" config options did not clear the
      supplementary group entries for the Tor process. The "User" option
      is now more robust, and we now set the groups to the specified
      user's primary group. The "Group" option is now ignored. For more
      detailed logging on credential switching, set CREDENTIAL_LOG_LEVEL
      in common/compat.c to LOG_NOTICE or higher. Patch by Jacob Appelbaum
      and Steven Murdoch. Bugfix on 0.0.2pre14. Fixes bug 848 and 857.
    - The "ClientDNSRejectInternalAddresses" config option wasn't being
      consistently obeyed: if an exit relay refuses a stream because its
      exit policy doesn't allow it, we would remember what IP address
      the relay said the destination address resolves to, even if it's
      an internal IP address. Bugfix on 0.2.0.7-alpha; patch by rovv.

  o Major bugfixes:
    - Fix a DOS opportunity during the voting signature collection process
      at directory authorities. Spotted by rovv. Bugfix on 0.2.0.x.

  o Major bugfixes (hidden services):
    - When fetching v0 and v2 rendezvous service descriptors in parallel,
      we were failing the whole hidden service request when the v0
      descriptor fetch fails, even if the v2 fetch is still pending and
      might succeed. Similarly, if the last v2 fetch fails, we were
      failing the whole hidden service request even if a v0 fetch is
      still pending. Fixes bug 814. Bugfix on 0.2.0.10-alpha.
    - When extending a circuit to a hidden service directory to upload a
      rendezvous descriptor using a BEGIN_DIR cell, almost 1/6 of all
      requests failed, because the router descriptor has not been
      downloaded yet. In these cases, do not attempt to upload the
      rendezvous descriptor, but wait until the router descriptor is
      downloaded and retry. Likewise, do not attempt to fetch a rendezvous
      descriptor from a hidden service directory for which the router
      descriptor has not yet been downloaded. Fixes bug 767. Bugfix
      on 0.2.0.10-alpha.

  o Minor bugfixes:
    - Fix several infrequent memory leaks spotted by Coverity.
    - When testing for libevent functions, set the LDFLAGS variable
      correctly. Found by Riastradh.
    - Avoid a bug where the FastFirstHopPK 0 option would keep Tor from
      bootstrapping with tunneled directory connections. Bugfix on
      0.1.2.5-alpha. Fixes bug 797. Found by Erwin Lam.
    - When asked to connect to A.B.exit:80, if we don't know the IP for A
      and we know that server B rejects most-but-not all connections to
      port 80, we would previously reject the connection. Now, we assume
      the user knows what they were asking for. Fixes bug 752. Bugfix
      on 0.0.9rc5. Diagnosed by BarkerJr.
    - If we overrun our per-second write limits a little, count this as
      having used up our write allocation for the second, and choke
      outgoing directory writes. Previously, we had only counted this when
      we had met our limits precisely. Fixes bug 824. Patch from by rovv.
      Bugfix on 0.2.0.x (??).
    - Remove the old v2 directory authority 'lefkada' from the default
      list. It has been gone for many months.
    - Stop doing unaligned memory access that generated bus errors on
      sparc64. Bugfix on 0.2.0.10-alpha. Fixes bug 862.
    - Make USR2 log-level switch take effect immediately. Bugfix on
      0.1.2.8-beta.

  o Minor bugfixes (controller):
    - Make DNS resolved events into "CLOSED", not "FAILED". Bugfix on
      0.1.2.5-alpha. Fix by Robert Hogan. Resolves bug 807.


Changes in version 0.2.1.7-alpha - 2008-11-08
  Tor 0.2.1.7-alpha fixes a major security problem in Debian and Ubuntu
  packages (and maybe other packages) noticed by Theo de Raadt, fixes
  a smaller security flaw that might allow an attacker to access local
  services, adds better defense against DNS poisoning attacks on exit
  relays, further improves hidden service performance, and fixes a
  variety of other issues.

  o Security fixes:
    - The "ClientDNSRejectInternalAddresses" config option wasn't being
      consistently obeyed: if an exit relay refuses a stream because its
      exit policy doesn't allow it, we would remember what IP address
      the relay said the destination address resolves to, even if it's
      an internal IP address. Bugfix on 0.2.0.7-alpha; patch by rovv.
    - The "User" and "Group" config options did not clear the
      supplementary group entries for the Tor process. The "User" option
      is now more robust, and we now set the groups to the specified
      user's primary group. The "Group" option is now ignored. For more
      detailed logging on credential switching, set CREDENTIAL_LOG_LEVEL
      in common/compat.c to LOG_NOTICE or higher. Patch by Jacob Appelbaum
      and Steven Murdoch. Bugfix on 0.0.2pre14. Fixes bug 848.
    - Do not use or believe expired v3 authority certificates. Patch
      from Karsten. Bugfix in 0.2.0.x. Fixes bug 851.

  o Minor features:
    - Now NodeFamily and MyFamily config options allow spaces in
      identity fingerprints, so it's easier to paste them in.
      Suggested by Lucky Green.
    - Implement the 0x20 hack to better resist DNS poisoning: set the
      case on outgoing DNS requests randomly, and reject responses that do
      not match the case correctly. This logic can be disabled with the
      ServerDNSRandomizeCase setting, if you are using one of the 0.3%
      of servers that do not reliably preserve case in replies. See
      "Increased DNS Forgery Resistance through 0x20-Bit Encoding"
      for more info.
    - Preserve case in replies to DNSPort requests in order to support
      the 0x20 hack for resisting DNS poisoning attacks.

  o Hidden service performance improvements:
    - When the client launches an introduction circuit, retry with a
      new circuit after 30 seconds rather than 60 seconds.
    - Launch a second client-side introduction circuit in parallel
      after a delay of 15 seconds (based on work by Christian Wilms).
    - Hidden services start out building five intro circuits rather
      than three, and when the first three finish they publish a service
      descriptor using those. Now we publish our service descriptor much
      faster after restart.

  o Minor bugfixes:
    - Minor fix in the warning messages when you're having problems
      bootstrapping; also, be more forgiving of bootstrap problems when
      we're still making incremental progress on a given bootstrap phase.
    - When we're choosing an exit node for a circuit, and we have
      no pending streams, choose a good general exit rather than one that
      supports "all the pending streams". Bugfix on 0.1.1.x. Fix by rovv.
    - Send a valid END cell back when a client tries to connect to a
      nonexistent hidden service port. Bugfix on 0.1.2.15. Fixes bug
      840. Patch from rovv.
    - If a broken client asks a non-exit router to connect somewhere,
      do not even do the DNS lookup before rejecting the connection.
      Fixes another case of bug 619. Patch from rovv.
    - Fix another case of assuming, when a specific exit is requested,
      that we know more than the user about what hosts it allows.
      Fixes another case of bug 752. Patch from rovv.
    - Check which hops rendezvous stream cells are associated with to
      prevent possible guess-the-streamid injection attacks from
      intermediate hops. Fixes another case of bug 446. Based on patch
      from rovv.
    - Avoid using a negative right-shift when comparing 32-bit
      addresses. Possible fix for bug 845 and bug 811.
    - Make the assert_circuit_ok() function work correctly on circuits that
      have already been marked for close.
    - Fix read-off-the-end-of-string error in unit tests when decoding
      introduction points.
    - Fix uninitialized size field for memory area allocation: may improve
      memory performance during directory parsing.
    - Treat duplicate certificate fetches as failures, so that we do
      not try to re-fetch an expired certificate over and over and over.
    - Do not say we're fetching a certificate when we'll in fact skip it
      because of a pending download.


Changes in version 0.2.1.6-alpha - 2008-09-30
  Tor 0.2.1.6-alpha further improves performance and robustness of
  hidden services, starts work on supporting per-country relay selection,
  and fixes a variety of smaller issues.

  o Major features:
    - Implement proposal 121: make it possible to build hidden services
      that only certain clients are allowed to connect to. This is
      enforced at several points, so that unauthorized clients are unable
      to send INTRODUCE cells to the service, or even (depending on the
      type of authentication) to learn introduction points. This feature
      raises the bar for certain kinds of active attacks against hidden
      services. Code by Karsten Loesing.
    - Relays now store and serve v2 hidden service descriptors by default,
      i.e., the new default value for HidServDirectoryV2 is 1. This is
      the last step in proposal 114, which aims to make hidden service
      lookups more reliable.
    - Start work to allow node restrictions to include country codes. The
      syntax to exclude nodes in a country with country code XX is
      "ExcludeNodes {XX}". Patch from Robert Hogan. It still needs some
      refinement to decide what config options should take priority if
      you ask to both use a particular node and exclude it.
    - Allow ExitNodes list to include IP ranges and country codes, just
      like the Exclude*Nodes lists. Patch from Robert Hogan.

  o Major bugfixes:
    - Fix a bug when parsing ports in tor_addr_port_parse() that caused
      Tor to fail to start if you had it configured to use a bridge
      relay. Fixes bug 809. Bugfix on 0.2.1.5-alpha.
    - When extending a circuit to a hidden service directory to upload a
      rendezvous descriptor using a BEGIN_DIR cell, almost 1/6 of all
      requests failed, because the router descriptor had not been
      downloaded yet. In these cases, we now wait until the router
      descriptor is downloaded, and then retry. Likewise, clients
      now skip over a hidden service directory if they don't yet have
      its router descriptor, rather than futilely requesting it and
      putting mysterious complaints in the logs. Fixes bug 767. Bugfix
      on 0.2.0.10-alpha.
    - When fetching v0 and v2 rendezvous service descriptors in parallel,
      we were failing the whole hidden service request when the v0
      descriptor fetch fails, even if the v2 fetch is still pending and
      might succeed. Similarly, if the last v2 fetch fails, we were
      failing the whole hidden service request even if a v0 fetch is
      still pending. Fixes bug 814. Bugfix on 0.2.0.10-alpha.
    - DNS replies need to have names matching their requests, but
      these names should be in the questions section, not necessarily
      in the answers section. Fixes bug 823. Bugfix on 0.2.1.5-alpha.

  o Minor features:
    - Update to the "September 1 2008" ip-to-country file.
    - Allow ports 465 and 587 in the default exit policy again. We had
      rejected them in 0.1.0.15, because back in 2005 they were commonly
      misconfigured and ended up as spam targets. We hear they are better
      locked down these days.
    - Use a lockfile to make sure that two Tor processes are not
      simultaneously running with the same datadir.
    - Serve the latest v3 networkstatus consensus via the control
      port. Use "getinfo dir/status-vote/current/consensus" to fetch it.
    - Better logging about stability/reliability calculations on directory
      servers.
    - Drop the requirement to have an open dir port for storing and
      serving v2 hidden service descriptors.
    - Directory authorities now serve a /tor/dbg-stability.txt URL to
      help debug WFU and MTBF calculations.
    - Implement most of Proposal 152: allow specialized servers to permit
      single-hop circuits, and clients to use those servers to build
      single-hop circuits when using a specialized controller. Patch
      from Josh Albrecht. Resolves feature request 768.
    - Add a -p option to tor-resolve for specifying the SOCKS port: some
      people find host:port too confusing.
    - Make TrackHostExit mappings expire a while after their last use, not
      after their creation. Patch from Robert Hogan.
    - Provide circuit purposes along with circuit events to the controller.

  o Minor bugfixes:
    - Fix compile on OpenBSD 4.4-current. Bugfix on 0.2.1.5-alpha.
      Reported by Tas.
    - Fixed some memory leaks -- some quite frequent, some almost
      impossible to trigger -- based on results from Coverity.
    - When testing for libevent functions, set the LDFLAGS variable
      correctly. Found by Riastradh.
    - Fix an assertion bug in parsing policy-related options; possible fix
      for bug 811.
    - Catch and report a few more bootstrapping failure cases when Tor
      fails to establish a TCP connection. Cleanup on 0.2.1.x.
    - Avoid a bug where the FastFirstHopPK 0 option would keep Tor from
      bootstrapping with tunneled directory connections. Bugfix on
      0.1.2.5-alpha. Fixes bug 797. Found by Erwin Lam.
    - When asked to connect to A.B.exit:80, if we don't know the IP for A
      and we know that server B rejects most-but-not all connections to
      port 80, we would previously reject the connection. Now, we assume
      the user knows what they were asking for. Fixes bug 752. Bugfix
      on 0.0.9rc5. Diagnosed by BarkerJr.
    - If we are not using BEGIN_DIR cells, don't attempt to contact hidden
      service directories if they have no advertised dir port. Bugfix
      on 0.2.0.10-alpha.
    - If we overrun our per-second write limits a little, count this as
      having used up our write allocation for the second, and choke
      outgoing directory writes. Previously, we had only counted this when
      we had met our limits precisely. Fixes bug 824. Patch by rovv.
      Bugfix on 0.2.0.x (??).
    - Avoid a "0 divided by 0" calculation when calculating router uptime
      at directory authorities. Bugfix on 0.2.0.8-alpha.
    - Make DNS resolved controller events into "CLOSED", not
      "FAILED". Bugfix on 0.1.2.5-alpha. Fix by Robert Hogan. Resolves
      bug 807.
    - Fix a bug where an unreachable relay would establish enough
      reachability testing circuits to do a bandwidth test -- if
      we already have a connection to the middle hop of the testing
      circuit, then it could establish the last hop by using the existing
      connection. Bugfix on 0.1.2.2-alpha, exposed when we made testing
      circuits no longer use entry guards in 0.2.1.3-alpha.
    - If we have correct permissions on $datadir, we complain to stdout
      and fail to start. But dangerous permissions on
      $datadir/cached-status/ would cause us to open a log and complain
      there. Now complain to stdout and fail to start in both cases. Fixes
      bug 820, reported by seeess.
    - Remove the old v2 directory authority 'lefkada' from the default
      list. It has been gone for many months.

  o Code simplifications and refactoring:
    - Revise the connection_new functions so that a more typesafe variant
      exists. This will work better with Coverity, and let us find any
      actual mistakes we're making here.
    - Refactor unit testing logic so that dmalloc can be used sensibly
      with unit tests to check for memory leaks.
    - Move all hidden-service related fields from connection and circuit
      structure to substructures: this way they won't eat so much memory.


Changes in version 0.2.0.31 - 2008-09-03
  Tor 0.2.0.31 addresses two potential anonymity issues, starts to fix
  a big bug we're seeing where in rare cases traffic from one Tor stream
  gets mixed into another stream, and fixes a variety of smaller issues.

  o Major bugfixes:
    - Make sure that two circuits can never exist on the same connection
      with the same circuit ID, even if one is marked for close. This
      is conceivably a bugfix for bug 779. Bugfix on 0.1.0.4-rc.
    - Relays now reject risky extend cells: if the extend cell includes
      a digest of all zeroes, or asks to extend back to the relay that
      sent the extend cell, tear down the circuit. Ideas suggested
      by rovv.
    - If not enough of our entry guards are available so we add a new
      one, we might use the new one even if it overlapped with the
      current circuit's exit relay (or its family). Anonymity bugfix
      pointed out by rovv.

  o Minor bugfixes:
    - Recover 3-7 bytes that were wasted per memory chunk. Fixes bug
      794; bug spotted by rovv. Bugfix on 0.2.0.1-alpha.
    - Correctly detect the presence of the linux/netfilter_ipv4.h header
      when building against recent kernels. Bugfix on 0.1.2.1-alpha.
    - Pick size of default geoip filename string correctly on windows.
      Fixes bug 806. Bugfix on 0.2.0.30.
    - Make the autoconf script accept the obsolete --with-ssl-dir
      option as an alias for the actually-working --with-openssl-dir
      option. Fix the help documentation to recommend --with-openssl-dir.
      Based on a patch by "Dave". Bugfix on 0.2.0.1-alpha.
    - When using the TransPort option on OpenBSD, and using the User
      option to change UID and drop privileges, make sure to open
      /dev/pf before dropping privileges. Fixes bug 782. Patch from
      Christopher Davis. Bugfix on 0.1.2.1-alpha.
    - Try to attach connections immediately upon receiving a RENDEZVOUS2
      or RENDEZVOUS_ESTABLISHED cell. This can save a second or two
      on the client side when connecting to a hidden service. Bugfix
      on 0.0.6pre1. Found and fixed by Christian Wilms; resolves bug 743.
    - When closing an application-side connection because its circuit is
      getting torn down, generate the stream event correctly. Bugfix on
      0.1.2.x. Anonymous patch.


Changes in version 0.2.1.5-alpha - 2008-08-31
  Tor 0.2.1.5-alpha moves us closer to handling IPv6 destinations, puts
  in a lot of the infrastructure for adding authorization to hidden
  services, lays the groundwork for having clients read their load
  balancing information out of the networkstatus consensus rather than
  the individual router descriptors, addresses two potential anonymity
  issues, and fixes a variety of smaller issues.

  o Major features:
    - Convert many internal address representations to optionally hold
      IPv6 addresses.
    - Generate and accept IPv6 addresses in many protocol elements.
    - Make resolver code handle nameservers located at ipv6 addresses.
    - Begin implementation of proposal 121 ("Client authorization for
      hidden services"): configure hidden services with client
      authorization, publish descriptors for them, and configure
      authorization data for hidden services at clients. The next
      step is to actually access hidden services that perform client
      authorization.
    - More progress toward proposal 141: Network status consensus
      documents and votes now contain bandwidth information for each
      router and a summary of that router's exit policy. Eventually this
      will be used by clients so that they do not have to download every
      known descriptor before building circuits.

  o Major bugfixes (on 0.2.0.x and before):
    - When sending CREATED cells back for a given circuit, use a 64-bit
      connection ID to find the right connection, rather than an addr:port
      combination. Now that we can have multiple OR connections between
      the same ORs, it is no longer possible to use addr:port to uniquely
      identify a connection.
    - Relays now reject risky extend cells: if the extend cell includes
      a digest of all zeroes, or asks to extend back to the relay that
      sent the extend cell, tear down the circuit. Ideas suggested
      by rovv.
    - If not enough of our entry guards are available so we add a new
      one, we might use the new one even if it overlapped with the
      current circuit's exit relay (or its family). Anonymity bugfix
      pointed out by rovv.

  o Minor bugfixes:
    - Recover 3-7 bytes that were wasted per memory chunk. Fixes bug
      794; bug spotted by rovv. Bugfix on 0.2.0.1-alpha.
    - When using the TransPort option on OpenBSD, and using the User
      option to change UID and drop privileges, make sure to open /dev/pf
      before dropping privileges. Fixes bug 782. Patch from Christopher
      Davis. Bugfix on 0.1.2.1-alpha.
    - Correctly detect the presence of the linux/netfilter_ipv4.h header
      when building against recent kernels. Bugfix on 0.1.2.1-alpha.
    - Add a missing safe_str() call for a debug log message.
    - Use 64 bits instead of 32 bits for connection identifiers used with
      the controller protocol, to greatly reduce risk of identifier reuse.
    - Make the autoconf script accept the obsolete --with-ssl-dir
      option as an alias for the actually-working --with-openssl-dir
      option. Fix the help documentation to recommend --with-openssl-dir.
      Based on a patch by "Dave". Bugfix on 0.2.0.1-alpha.

  o Minor features:
    - Rate-limit too-many-sockets messages: when they happen, they happen
      a lot. Resolves bug 748.
    - Resist DNS poisoning a little better by making sure that names in
      answer sections match.
    - Print the SOCKS5 error message string as well as the error code
      when a tor-resolve request fails. Patch from Jacob.


Changes in version 0.2.1.4-alpha - 2008-08-04
  Tor 0.2.1.4-alpha fixes a pair of crash bugs in 0.2.1.3-alpha.

  o Major bugfixes:
    - The address part of exit policies was not correctly written
      to router descriptors. This generated router descriptors that failed
      their self-checks. Noticed by phobos, fixed by Karsten. Bugfix
      on 0.2.1.3-alpha.
    - Tor triggered a false assert when extending a circuit to a relay
      but we already have a connection open to that relay. Noticed by
      phobos, fixed by Karsten. Bugfix on 0.2.1.3-alpha.

  o Minor bugfixes:
    - Fix a hidden service logging bug: in some edge cases, the router
      descriptor of a previously picked introduction point becomes
      obsolete and we need to give up on it rather than continually
      complaining that it has become obsolete. Observed by xiando. Bugfix
      on 0.2.1.3-alpha.

  o Removed features:
    - Take out the TestVia config option, since it was a workaround for
      a bug that was fixed in Tor 0.1.1.21.


Changes in version 0.2.1.3-alpha - 2008-08-03
  Tor 0.2.1.3-alpha implements most of the pieces to prevent
  infinite-length circuit attacks (see proposal 110); fixes a bug that
  might cause exit relays to corrupt streams they send back; allows
  address patterns (e.g. 255.128.0.0/16) to appear in ExcludeNodes and
  ExcludeExitNodes config options; and fixes a big pile of bugs.

  o Bootstrapping bugfixes (on 0.2.1.x-alpha):
    - Send a bootstrap problem "warn" event on the first problem if the
      reason is NO_ROUTE (that is, our network is down).

  o Major features:
    - Implement most of proposal 110: The first K cells to be sent
      along a circuit are marked as special "early" cells; only K "early"
      cells will be allowed. Once this code is universal, we can block
      certain kinds of DOS attack by requiring that EXTEND commands must
      be sent using an "early" cell.

  o Major bugfixes:
    - Try to attach connections immediately upon receiving a RENDEZVOUS2
      or RENDEZVOUS_ESTABLISHED cell. This can save a second or two
      on the client side when connecting to a hidden service. Bugfix
      on 0.0.6pre1. Found and fixed by Christian Wilms; resolves bug 743.
    - Ensure that two circuits can never exist on the same connection
      with the same circuit ID, even if one is marked for close. This
      is conceivably a bugfix for bug 779; fixes a bug on 0.1.0.4-rc.

  o Minor features:
    - When relays do their initial bandwidth measurement, don't limit
      to just our entry guards for the test circuits. Otherwise we tend
      to have multiple test circuits going through a single entry guard,
      which makes our bandwidth test less accurate. Fixes part of bug 654;
      patch contributed by Josh Albrecht.
    - Add an ExcludeExitNodes option so users can list a set of nodes
      that should be be excluded from the exit node position, but
      allowed elsewhere. Implements proposal 151.
    - Allow address patterns (e.g., 255.128.0.0/16) to appear in
      ExcludeNodes and ExcludeExitNodes lists.
    - Change the implementation of ExcludeNodes and ExcludeExitNodes to
      be more efficient. Formerly it was quadratic in the number of
      servers; now it should be linear. Fixes bug 509.
    - Save 16-22 bytes per open circuit by moving the n_addr, n_port,
      and n_conn_id_digest fields into a separate structure that's
      only needed when the circuit has not yet attached to an n_conn.

  o Minor bugfixes:
    - Change the contrib/tor.logrotate script so it makes the new
      logs as "_tor:_tor" rather than the default, which is generally
      "root:wheel". Fixes bug 676, reported by Serge Koksharov.
    - Stop using __attribute__((nonnull)) with GCC: it can give us useful
      warnings (occasionally), but it can also cause the compiler to
      eliminate error-checking code. Suggested by Peter Gutmann.
    - When a hidden service is giving up on an introduction point candidate
      that was not included in the last published rendezvous descriptor,
      don't reschedule publication of the next descriptor. Fixes bug 763.
      Bugfix on 0.0.9.3.
    - Mark RendNodes, RendExcludeNodes, HiddenServiceNodes, and
      HiddenServiceExcludeNodes as obsolete: they never worked properly,
      and nobody claims to be using them. Fixes bug 754. Bugfix on
      0.1.0.1-rc. Patch from Christian Wilms.
    - Fix a small alignment and memory-wasting bug on buffer chunks.
      Spotted by rovv.

  o Minor bugfixes (controller):
    - When closing an application-side connection because its circuit
      is getting torn down, generate the stream event correctly.
      Bugfix on 0.1.2.x. Anonymous patch.

  o Removed features:
    - Remove all backward-compatibility code to support relays running
      versions of Tor so old that they no longer work at all on the
      Tor network.


Changes in version 0.2.0.30 - 2008-07-15
  o Minor bugfixes:
    - Stop using __attribute__((nonnull)) with GCC: it can give us useful
      warnings (occasionally), but it can also cause the compiler to
      eliminate error-checking code. Suggested by Peter Gutmann.


Changes in version 0.2.0.29-rc - 2008-07-08
  Tor 0.2.0.29-rc fixes two big bugs with using bridges, fixes more
  hidden-service performance bugs, and fixes a bunch of smaller bugs.

  o Major bugfixes:
    - If you have more than one bridge but don't know their keys,
      you would only launch a request for the descriptor of the first one
      on your list. (Tor considered launching requests for the others, but
      found that it already had a connection on the way for $0000...0000
      so it didn't open another.) Bugfix on 0.2.0.x.
    - If you have more than one bridge but don't know their keys, and the
      connection to one of the bridges failed, you would cancel all
      pending bridge connections. (After all, they all have the same
      digest.) Bugfix on 0.2.0.x.
    - When a hidden service was trying to establish an introduction point,
      and Tor had built circuits preemptively for such purposes, we
      were ignoring all the preemptive circuits and launching a new one
      instead. Bugfix on 0.2.0.14-alpha.
    - When a hidden service was trying to establish an introduction point,
      and Tor *did* manage to reuse one of the preemptively built
      circuits, it didn't correctly remember which one it used,
      so it asked for another one soon after, until there were no
      more preemptive circuits, at which point it launched one from
      scratch. Bugfix on 0.0.9.x.
    - Make directory servers include the X-Your-Address-Is: http header in
      their responses even for begin_dir conns. Now clients who only
      ever use begin_dir connections still have a way to learn their IP
      address. Fixes bug 737; bugfix on 0.2.0.22-rc. Reported by goldy.

  o Minor bugfixes:
    - Fix a macro/CPP interaction that was confusing some compilers:
      some GCCs don't like #if/#endif pairs inside macro arguments.
      Fixes bug 707.
    - Fix macro collision between OpenSSL 0.9.8h and Windows headers.
      Fixes bug 704; fix from Steven Murdoch.
    - When opening /dev/null in finish_daemonize(), do not pass the
      O_CREAT flag. Fortify was complaining, and correctly so. Fixes
      bug 742; fix from Michael Scherer. Bugfix on 0.0.2pre19.
    - Correctly detect transparent proxy support on Linux hosts that
      require in.h to be included before netfilter_ipv4.h. Patch
      from coderman.
    - Disallow session resumption attempts during the renegotiation
      stage of the v2 handshake protocol. Clients should never be trying
      session resumption at this point, but apparently some did, in
      ways that caused the handshake to fail. Bugfix on 0.2.0.20-rc. Bug
      found by Geoff Goodell.


Changes in version 0.2.1.2-alpha - 2008-06-20
  Tor 0.2.1.2-alpha includes a new "TestingTorNetwork" config option to
  make it easier to set up your own private Tor network; fixes several
  big bugs with using more than one bridge relay; fixes a big bug with
  offering hidden services quickly after Tor starts; and uses a better
  API for reporting potential bootstrapping problems to the controller.

  o Major features:
    - New TestingTorNetwork config option to allow adjustment of
      previously constant values that, while reasonable, could slow
      bootstrapping. Implements proposal 135. Patch from Karsten.

  o Major bugfixes:
    - If you have more than one bridge but don't know their digests,
      you would only learn a request for the descriptor of the first one
      on your list. (Tor considered launching requests for the others, but
      found that it already had a connection on the way for $0000...0000
      so it didn't open another.) Bugfix on 0.2.0.x.
    - If you have more than one bridge but don't know their digests,
      and the connection to one of the bridges failed, you would cancel
      all pending bridge connections. (After all, they all have the
      same digest.) Bugfix on 0.2.0.x.
    - When establishing a hidden service, introduction points that
      originate from cannibalized circuits are completely ignored and not
      included in rendezvous service descriptors. This might be another
      reason for delay in making a hidden service available. Bugfix
      from long ago (0.0.9.x?)

  o Minor features:
    - Allow OpenSSL to use dynamic locks if it wants.
    - When building a consensus, do not include routers that are down.
      This will cut down 30% to 40% on consensus size. Implements
      proposal 138.
    - In directory authorities' approved-routers files, allow
      fingerprints with or without space.
    - Add a "GETINFO /status/bootstrap-phase" controller option, so the
      controller can query our current bootstrap state in case it attaches
      partway through and wants to catch up.
    - Send an initial "Starting" bootstrap status event, so we have a
      state to start out in.

  o Minor bugfixes:
    - Asking for a conditional consensus at .../consensus/<fingerprints>
      would crash a dirserver if it did not already have a
      consensus. Bugfix on 0.2.1.1-alpha.
    - Clean up some macro/CPP interactions: some GCC versions don't like
      #if/#endif pairs inside macro arguments. Fixes bug 707. Bugfix on
      0.2.0.x.

  o Bootstrapping bugfixes (on 0.2.1.1-alpha):
    - Directory authorities shouldn't complain about bootstrapping
      problems just because they do a lot of reachability testing and
      some of the connection attempts fail.
    - Start sending "count" and "recommendation" key/value pairs in
      bootstrap problem status events, so the controller can hear about
      problems even before Tor decides they're worth reporting for sure.
    - If you're using bridges, generate "bootstrap problem" warnings
      as soon as you run out of working bridges, rather than waiting
      for ten failures -- which will never happen if you have less than
      ten bridges.
    - If we close our OR connection because there's been a circuit
      pending on it for too long, we were telling our bootstrap status
      events "REASON=NONE". Now tell them "REASON=TIMEOUT".


Changes in version 0.2.1.1-alpha - 2008-06-13
  Tor 0.2.1.1-alpha fixes a lot of memory fragmentation problems that
  were making the Tor process bloat especially on Linux; makes our TLS
  handshake blend in better; sends "bootstrap phase" status events to
  the controller, so it can keep the user informed of progress (and
  problems) fetching directory information and establishing circuits;
  and adds a variety of smaller features.

  o Major features:
    - More work on making our TLS handshake blend in: modify the list
      of ciphers advertised by OpenSSL in client mode to even more
      closely resemble a common web browser. We cheat a little so that
      we can advertise ciphers that the locally installed OpenSSL doesn't
      know about.
    - Start sending "bootstrap phase" status events to the controller,
      so it can keep the user informed of progress fetching directory
      information and establishing circuits. Also inform the controller
      if we think we're stuck at a particular bootstrap phase. Implements
      proposal 137.
    - Resume using OpenSSL's RAND_poll() for better (and more portable)
      cross-platform entropy collection again. We used to use it, then
      stopped using it because of a bug that could crash systems that
      called RAND_poll when they had a lot of fds open. It looks like the
      bug got fixed in late 2006. Our new behavior is to call RAND_poll()
      at startup, and to call RAND_poll() when we reseed later only if
      we have a non-buggy OpenSSL version.

  o Major bugfixes:
    - When we choose to abandon a new entry guard because we think our
      older ones might be better, close any circuits pending on that
      new entry guard connection. This fix should make us recover much
      faster when our network is down and then comes back. Bugfix on
      0.1.2.8-beta; found by lodger.

  o Memory fixes and improvements:
    - Add a malloc_good_size implementation to OpenBSD_malloc_linux.c,
      to avoid unused RAM in buffer chunks and memory pools.
    - Speed up parsing and cut down on memory fragmentation by using
      stack-style allocations for parsing directory objects. Previously,
      this accounted for over 40% of allocations from within Tor's code
      on a typical directory cache.
    - Use a Bloom filter rather than a digest-based set to track which
      descriptors we need to keep around when we're cleaning out old
      router descriptors. This speeds up the computation significantly,
      and may reduce fragmentation.
    - Reduce the default smartlist size from 32 to 16; it turns out that
      most smartlists hold around 8-12 elements tops.
    - Make dumpstats() log the fullness and size of openssl-internal
      buffers.
    - If the user has applied the experimental SSL_MODE_RELEASE_BUFFERS
      patch to their OpenSSL, turn it on to save memory on servers. This
      patch will (with any luck) get included in a mainline distribution
      before too long.
    - Never use OpenSSL compression: it wastes RAM and CPU trying to
      compress cells, which are basically all encrypted, compressed,
      or both.

  o Minor bugfixes:
    - Stop reloading the router list from disk for no reason when we
      run out of reachable directory mirrors. Once upon a time reloading
      it would set the 'is_running' flag back to 1 for them. It hasn't
      done that for a long time.
    - In very rare situations new hidden service descriptors were
      published earlier than 30 seconds after the last change to the
      service. (We currently think that a hidden service descriptor
      that's been stable for 30 seconds is worth publishing.)

  o Minor features:
    - Allow separate log levels to be configured for different logging
      domains. For example, this allows one to log all notices, warnings,
      or errors, plus all memory management messages of level debug or
      higher, with: Log [MM] debug-err [*] notice-err file /var/log/tor.
    - Add a couple of extra warnings to --enable-gcc-warnings for GCC 4.3,
      and stop using a warning that had become unfixably verbose under
      GCC 4.3.
    - New --hush command-line option similar to --quiet. While --quiet
      disables all logging to the console on startup, --hush limits the
      output to messages of warning and error severity.
    - Servers support a new URL scheme for consensus downloads that
      allows the client to specify which authorities are trusted.
      The server then only sends the consensus if the client will trust
      it. Otherwise a 404 error is sent back. Clients use this
      new scheme when the server supports it (meaning it's running
      0.2.1.1-alpha or later). Implements proposal 134.
    - New configure/torrc options (--enable-geoip-stats,
      DirRecordUsageByCountry) to record how many IPs we've served
      directory info to in each country code, how many status documents
      total we've sent to each country code, and what share of the total
      directory requests we should expect to see.
    - Use the TLS1 hostname extension to more closely resemble browser
      behavior.
    - Lots of new unit tests.
    - Add a macro to implement the common pattern of iterating through
      two parallel lists in lockstep.


Changes in version 0.2.0.28-rc - 2008-06-13
  Tor 0.2.0.28-rc fixes an anonymity-related bug, fixes a hidden-service
  performance bug, and fixes a bunch of smaller bugs.

  o Anonymity fixes:
    - Fix a bug where, when we were choosing the 'end stream reason' to
      put in our relay end cell that we send to the exit relay, Tor
      clients on Windows were sometimes sending the wrong 'reason'. The
      anonymity problem is that exit relays may be able to guess whether
      the client is running Windows, thus helping partition the anonymity
      set. Down the road we should stop sending reasons to exit relays,
      or otherwise prevent future versions of this bug.

  o Major bugfixes:
    - While setting up a hidden service, some valid introduction circuits
      were overlooked and abandoned. This might be the reason for
      the long delay in making a hidden service available. Bugfix on
      0.2.0.14-alpha.

  o Minor features:
    - Update to the "June 9 2008" ip-to-country file.
    - Run 'make test' as part of 'make dist', so we stop releasing so
      many development snapshots that fail their unit tests.

  o Minor bugfixes:
    - When we're checking if we have enough dir info for each relay
      to begin establishing circuits, make sure that we actually have
      the descriptor listed in the consensus, not just any descriptor.
      Bugfix on 0.1.2.x.
    - Bridge relays no longer print "xx=0" in their extrainfo document
      for every single country code in the geoip db. Bugfix on
      0.2.0.27-rc.
    - Only warn when we fail to load the geoip file if we were planning to
      include geoip stats in our extrainfo document. Bugfix on 0.2.0.27-rc.
    - If we change our MaxAdvertisedBandwidth and then reload torrc,
      Tor won't realize it should publish a new relay descriptor. Fixes
      bug 688, reported by mfr. Bugfix on 0.1.2.x.
    - When we haven't had any application requests lately, don't bother
      logging that we have expired a bunch of descriptors. Bugfix
      on 0.1.2.x.
    - Make relay cells written on a connection count as non-padding when
      tracking how long a connection has been in use. Bugfix on
      0.2.0.1-alpha. Spotted by lodger.
    - Fix unit tests in 0.2.0.27-rc.
    - Fix compile on Windows.


Changes in version 0.2.0.27-rc - 2008-06-03
  Tor 0.2.0.27-rc adds a few features we left out of the earlier
  release candidates. In particular, we now include an IP-to-country
  GeoIP database, so controllers can easily look up what country a
  given relay is in, and so bridge relays can give us some sanitized
  summaries about which countries are making use of bridges. (See proposal
  126-geoip-fetching.txt for details.)

  o Major features:
    - Include an IP-to-country GeoIP file in the tarball, so bridge
      relays can report sanitized summaries of the usage they're seeing.

  o Minor features:
    - Add a "PURPOSE=" argument to "STREAM NEW" events, as suggested by
      Robert Hogan. Fixes the first part of bug 681.
    - Make bridge authorities never serve extrainfo docs.
    - Add support to detect Libevent versions in the 1.4.x series
      on mingw.
    - Fix build on gcc 4.3 with --enable-gcc-warnings set.
    - Include a new contrib/tor-exit-notice.html file that exit relay
      operators can put on their website to help reduce abuse queries.

  o Minor bugfixes:
    - When tunneling an encrypted directory connection, and its first
      circuit fails, do not leave it unattached and ask the controller
      to deal. Fixes the second part of bug 681.
    - Make bridge authorities correctly expire old extrainfo documents
      from time to time.


Changes in version 0.2.0.26-rc - 2008-05-13
  Tor 0.2.0.26-rc fixes a major security vulnerability caused by a bug
  in Debian's OpenSSL packages. All users running any 0.2.0.x version
  should upgrade, whether they're running Debian or not.

  o Major security fixes:
    - Use new V3 directory authority keys on the tor26, gabelmoo, and
      moria1 V3 directory authorities. The old keys were generated with
      a vulnerable version of Debian's OpenSSL package, and must be
      considered compromised. Other authorities' keys were not generated
      with an affected version of OpenSSL.

  o Major bugfixes:
    - List authority signatures as "unrecognized" based on DirServer
      lines, not on cert cache. Bugfix on 0.2.0.x.

  o Minor features:
    - Add a new V3AuthUseLegacyKey option to make it easier for
      authorities to change their identity keys if they have to.


Changes in version 0.2.0.25-rc - 2008-04-23
  Tor 0.2.0.25-rc makes Tor work again on OS X and certain BSDs.

  o Major bugfixes:
    - Remember to initialize threading before initializing logging.
      Otherwise, many BSD-family implementations will crash hard on
      startup. Fixes bug 671. Bugfix on 0.2.0.24-rc.

  o Minor bugfixes:
    - Authorities correctly free policies on bad servers on
      exit. Fixes bug 672. Bugfix on 0.2.0.x.


Changes in version 0.2.0.24-rc - 2008-04-22
  Tor 0.2.0.24-rc adds dizum (run by Alex de Joode) as the new sixth
  v3 directory authority, makes relays with dynamic IP addresses and no
  DirPort notice more quickly when their IP address changes, fixes a few
  rare crashes and memory leaks, and fixes a few other miscellaneous bugs.

  o New directory authorities:
    - Take lefkada out of the list of v3 directory authorities, since
      it has been down for months.
    - Set up dizum (run by Alex de Joode) as the new sixth v3 directory
      authority.

  o Major bugfixes:
    - Detect address changes more quickly on non-directory mirror
      relays. Bugfix on 0.2.0.18-alpha; fixes bug 652.

  o Minor features (security):
    - Reject requests for reverse-dns lookup of names that are in
      a private address space. Patch from lodger.
    - Non-exit relays no longer allow DNS requests. Fixes bug 619. Patch
      from lodger.

  o Minor bugfixes (crashes):
    - Avoid a rare assert that can trigger when Tor doesn't have much
      directory information yet and it tries to fetch a v2 hidden
      service descriptor. Fixes bug 651, reported by nwf.
    - Initialize log mutex before initializing dmalloc. Otherwise,
      running with dmalloc would crash. Bugfix on 0.2.0.x-alpha.
    - Use recursive pthread mutexes in order to avoid deadlock when
      logging debug-level messages to a controller. Bug spotted by nwf,
      bugfix on 0.2.0.16-alpha.

  o Minor bugfixes (resource management):
    - Keep address policies from leaking memory: start their refcount
      at 1, not 2. Bugfix on 0.2.0.16-alpha.
    - Free authority certificates on exit, so they don't look like memory
      leaks. Bugfix on 0.2.0.19-alpha.
    - Free static hashtables for policy maps and for TLS connections on
      shutdown, so they don't look like memory leaks. Bugfix on 0.2.0.x.
    - Avoid allocating extra space when computing consensuses on 64-bit
      platforms. Bug spotted by aakova.

  o Minor bugfixes (misc):
    - Do not read the configuration file when we've only been told to
      generate a password hash. Fixes bug 643. Bugfix on 0.0.9pre5. Fix
      based on patch from Sebastian Hahn.
    - Exit relays that are used as a client can now reach themselves
      using the .exit notation, rather than just launching an infinite
      pile of circuits. Fixes bug 641. Reported by Sebastian Hahn.
    - When attempting to open a logfile fails, tell us why.
    - Fix a dumb bug that was preventing us from knowing that we should
      preemptively build circuits to handle expected directory requests.
      Fixes bug 660. Bugfix on 0.1.2.x.
    - Warn less verbosely about clock skew from netinfo cells from
      untrusted sources. Fixes bug 663.
    - Make controller stream events for DNS requests more consistent,
      by adding "new stream" events for DNS requests, and removing
      spurious "stream closed" events" for cached reverse resolves.
      Patch from mwenge. Fixes bug 646.
    - Correctly notify one-hop connections when a circuit build has
      failed. Possible fix for bug 669. Found by lodger.


Changes in version 0.2.0.23-rc - 2008-03-24
  Tor 0.2.0.23-rc is the fourth release candidate for the 0.2.0 series. It
  makes bootstrapping faster if the first directory mirror you contact
  is down. The bundles also include the new Vidalia 0.1.2 release.

  o Major bugfixes:
    - When a tunneled directory request is made to a directory server
      that's down, notice after 30 seconds rather than 120 seconds. Also,
      fail any begindir streams that are pending on it, so they can
      retry elsewhere. This was causing multi-minute delays on bootstrap.


Changes in version 0.2.0.22-rc - 2008-03-18
  Tor 0.2.0.22-rc is the third release candidate for the 0.2.0 series. It
  enables encrypted directory connections by default for non-relays, fixes
  some broken TLS behavior we added in 0.2.0.20-rc, and resolves many
  other bugs. The bundles also include Vidalia 0.1.1 and Torbutton 1.1.17.

  o Major features:
    - Enable encrypted directory connections by default for non-relays,
      so censor tools that block Tor directory connections based on their
      plaintext patterns will no longer work. This means Tor works in
      certain censored countries by default again.

  o Major bugfixes:
    - Make sure servers always request certificates from clients during
      TLS renegotiation. Reported by lodger; bugfix on 0.2.0.20-rc.
    - Do not enter a CPU-eating loop when a connection is closed in
      the middle of client-side TLS renegotiation. Fixes bug 622. Bug
      diagnosed by lodger; bugfix on 0.2.0.20-rc.
    - Fix assertion failure that could occur when a blocked circuit
      became unblocked, and it had pending client DNS requests. Bugfix
      on 0.2.0.1-alpha. Fixes bug 632.

  o Minor bugfixes (on 0.1.2.x):
    - Generate "STATUS_SERVER" events rather than misspelled
      "STATUS_SEVER" events. Caught by mwenge.
    - When counting the number of bytes written on a TLS connection,
      look at the BIO actually used for writing to the network, not
      at the BIO used (sometimes) to buffer data for the network.
      Looking at different BIOs could result in write counts on the
      order of ULONG_MAX. Fixes bug 614.
    - On Windows, correctly detect errors when listing the contents of
      a directory. Fix from lodger.

  o Minor bugfixes (on 0.2.0.x):
    - Downgrade "sslv3 alert handshake failure" message to INFO.
    - If we set RelayBandwidthRate and RelayBandwidthBurst very high but
      left BandwidthRate and BandwidthBurst at the default, we would be
      silently limited by those defaults. Now raise them to match the
      RelayBandwidth* values.
    - Fix the SVK version detection logic to work correctly on a branch.
    - Make --enable-openbsd-malloc work correctly on Linux with alpha
      CPUs. Fixes bug 625.
    - Logging functions now check that the passed severity is sane.
    - Use proper log levels in the testsuite call of
      get_interface_address6().
    - When using a nonstandard malloc, do not use the platform values for
      HAVE_MALLOC_GOOD_SIZE or HAVE_MALLOC_USABLE_SIZE.
    - Make the openbsd malloc code use 8k pages on alpha CPUs and
      16k pages on ia64.
    - Detect mismatched page sizes when using --enable-openbsd-malloc.
    - Avoid double-marked-for-close warning when certain kinds of invalid
      .in-addr.arpa addresses are passed to the DNSPort. Part of a fix
      for bug 617. Bugfix on 0.2.0.1-alpha.
    - Make sure that the "NULL-means-reject *:*" convention is followed by
      all the policy manipulation functions, avoiding some possible crash
      bugs. Bug found by lodger. Bugfix on 0.2.0.16-alpha.
    - Fix the implementation of ClientDNSRejectInternalAddresses so that it
      actually works, and doesn't warn about every single reverse lookup.
      Fixes the other part of bug 617.  Bugfix on 0.2.0.1-alpha.

  o Minor features:
    - Only log guard node status when guard node status has changed.
    - Downgrade the 3 most common "INFO" messages to "DEBUG". This will
      make "INFO" 75% less verbose.


Changes in version 0.2.0.21-rc - 2008-03-02
  Tor 0.2.0.21-rc is the second release candidate for the 0.2.0 series. It
  makes Tor work well with Vidalia again, fixes a rare assert bug,
  and fixes a pair of more minor bugs. The bundles also include Vidalia
  0.1.0 and Torbutton 1.1.16.

  o Major bugfixes:
    - The control port should declare that it requires password auth
      when HashedControlSessionPassword is set too. Patch from Matt Edman;
      bugfix on 0.2.0.20-rc. Fixes bug 615.
    - Downgrade assert in connection_buckets_decrement() to a log message.
      This may help us solve bug 614, and in any case will make its
      symptoms less severe. Bugfix on 0.2.0.20-rc. Reported by fredzupy.
    - We were sometimes miscounting the number of bytes read from the
      network, causing our rate limiting to not be followed exactly.
      Bugfix on 0.2.0.16-alpha. Reported by lodger.

  o Minor bugfixes:
    - Fix compilation with OpenSSL 0.9.8 and 0.9.8a. All other supported
      OpenSSL versions should have been working fine. Diagnosis and patch
      from lodger, Karsten Loesing, and Sebastian Hahn. Fixes bug 616.
      Bugfix on 0.2.0.20-rc.


Changes in version 0.2.0.20-rc - 2008-02-24
  Tor 0.2.0.20-rc is the first release candidate for the 0.2.0 series. It
  makes more progress towards normalizing Tor's TLS handshake, makes
  hidden services work better again, helps relays bootstrap if they don't
  know their IP address, adds optional support for linking in openbsd's
  allocator or tcmalloc, allows really fast relays to scale past 15000
  sockets, and fixes a bunch of minor bugs reported by Veracode.

  o Major features:
    - Enable the revised TLS handshake based on the one designed by
      Steven Murdoch in proposal 124, as revised in proposal 130. It
      includes version negotiation for OR connections as described in
      proposal 105. The new handshake is meant to be harder for censors
      to fingerprint, and it adds the ability to detect certain kinds of
      man-in-the-middle traffic analysis attacks. The version negotiation
      feature will allow us to improve Tor's link protocol more safely
      in the future.
    - Choose which bridge to use proportional to its advertised bandwidth,
      rather than uniformly at random. This should speed up Tor for
      bridge users. Also do this for people who set StrictEntryNodes.
    - When a TrackHostExits-chosen exit fails too many times in a row,
      stop using it. Bugfix on 0.1.2.x; fixes bug 437.

  o Major bugfixes:
    - Resolved problems with (re-)fetching hidden service descriptors.
      Patch from Karsten Loesing; fixes problems with 0.2.0.18-alpha
      and 0.2.0.19-alpha.
    - If we only ever used Tor for hidden service lookups or posts, we
      would stop building circuits and start refusing connections after
      24 hours, since we falsely believed that Tor was dormant. Reported
      by nwf; bugfix on 0.1.2.x.
    - Servers that don't know their own IP address should go to the
      authorities for their first directory fetch, even if their DirPort
      is off or if they don't know they're reachable yet. This will help
      them bootstrap better. Bugfix on 0.2.0.18-alpha; fixes bug 609.
    - When counting the number of open sockets, count not only the number
      of sockets we have received from the socket() call, but also
      the number we've gotten from accept() and socketpair(). This bug
      made us fail to count all sockets that we were using for incoming
      connections. Bugfix on 0.2.0.x.
    - Fix code used to find strings within buffers, when those strings
      are not in the first chunk of the buffer. Bugfix on 0.2.0.x.
    - Fix potential segfault when parsing HTTP headers. Bugfix on 0.2.0.x.
    - Add a new __HashedControlSessionPassword option for controllers
      to use for one-off session password hashes that shouldn't get
      saved to disk by SAVECONF --- Vidalia users were accumulating a
      pile of HashedControlPassword lines in their torrc files, one for
      each time they had restarted Tor and then clicked Save. Make Tor
      automatically convert "HashedControlPassword" to this new option but
      only when it's given on the command line. Partial fix for bug 586.

  o Minor features (performance):
    - Tune parameters for cell pool allocation to minimize amount of
      RAM overhead used.
    - Add OpenBSD malloc code from phk as an optional malloc
      replacement on Linux: some glibc libraries do very poorly
      with Tor's memory allocation patterns. Pass
      --enable-openbsd-malloc to get the replacement malloc code.
    - Add a --with-tcmalloc option to the configure script to link
      against tcmalloc (if present). Does not yet search for
      non-system include paths.
    - Stop imposing an arbitrary maximum on the number of file descriptors
      used for busy servers. Bug reported by Olaf Selke; patch from
      Sebastian Hahn.

  o Minor features (other):
    - When SafeLogging is disabled, log addresses along with all TLS
      errors.
    - When building with --enable-gcc-warnings, check for whether Apple's
      warning "-Wshorten-64-to-32" is available.
    - Add a --passphrase-fd argument to the tor-gencert command for
      scriptability.

  o Minor bugfixes (memory leaks and code problems):
    - We were leaking a file descriptor if Tor started with a zero-length
      cached-descriptors file. Patch by freddy77; bugfix on 0.1.2.
    - Detect size overflow in zlib code. Reported by Justin Ferguson and
      Dan Kaminsky.
    - We were comparing the raw BridgePassword entry with a base64'ed
      version of it, when handling a "/tor/networkstatus-bridges"
      directory request. Now compare correctly. Noticed by Veracode.
    - Recover from bad tracked-since value in MTBF-history file.
      Should fix bug 537.
    - Alter the code that tries to recover from unhandled write
      errors, to not try to flush onto a socket that's given us
      unhandled errors. Bugfix on 0.1.2.x.
    - Make Unix controlsockets work correctly on OpenBSD. Patch from
      tup. Bugfix on 0.2.0.3-alpha.

  o Minor bugfixes (other):
    - If we have an extra-info document for our server, always make
      it available on the control port, even if we haven't gotten
      a copy of it from an authority yet. Patch from mwenge.
    - Log the correct memory chunk sizes for empty RAM chunks in mempool.c.
    - Directory mirrors no longer include a guess at the client's IP
      address if the connection appears to be coming from the same /24
      network; it was producing too many wrong guesses.
    - Make the new hidden service code respect the SafeLogging setting.
      Bugfix on 0.2.0.x. Patch from Karsten.
    - When starting as an authority, do not overwrite all certificates
      cached from other authorities. Bugfix on 0.2.0.x. Fixes bug 606.
    - If we're trying to flush the last bytes on a connection (for
      example, when answering a directory request), reset the
      time-to-give-up timeout every time we manage to write something
      on the socket. Bugfix on 0.1.2.x.
    - Change the behavior of "getinfo status/good-server-descriptor"
      so it doesn't return failure when any authority disappears.
    - Even though the man page said that "TrackHostExits ." should
      work, nobody had ever implemented it. Bugfix on 0.1.0.x.
    - Report TLS "zero return" case as a "clean close" and "IO error"
      as a "close". Stop calling closes "unexpected closes": existing
      Tors don't use SSL_close(), so having a connection close without
      the TLS shutdown handshake is hardly unexpected.
    - Send NAMESERVER_STATUS messages for a single failed nameserver
      correctly.

  o Code simplifications and refactoring:
    - Remove the tor_strpartition function: its logic was confused,
      and it was only used for one thing that could be implemented far
      more easily.


Changes in version 0.2.0.19-alpha - 2008-02-09
  Tor 0.2.0.19-alpha makes more progress towards normalizing Tor's TLS
  handshake, makes path selection for relays more secure and IP address
  guessing more robust, and generally fixes a lot of bugs in preparation
  for calling the 0.2.0 branch stable.

  o Major features:
    - Do not include recognizeable strings in the commonname part of
      Tor's x509 certificates.

  o Major bugfixes:
    - If we're a relay, avoid picking ourselves as an introduction point,
      a rendezvous point, or as the final hop for internal circuits. Bug
      reported by taranis and lodger. Bugfix on 0.1.2.x.
    - Patch from "Andrew S. Lists" to catch when we contact a directory
      mirror at IP address X and he says we look like we're coming from
      IP address X. Bugfix on 0.1.2.x.

  o Minor features (security):
    - Be more paranoid about overwriting sensitive memory on free(),
      as a defensive programming tactic to ensure forward secrecy.

  o Minor features (directory authority):
    - Actually validate the options passed to AuthDirReject,
      AuthDirInvalid, AuthDirBadDir, and AuthDirBadExit.
    - Reject router descriptors with out-of-range bandwidthcapacity or
      bandwidthburst values.

  o Minor features (controller):
    - Reject controller commands over 1MB in length.  This keeps rogue
      processes from running us out of memory.

  o Minor features (misc):
    - Give more descriptive well-formedness errors for out-of-range
      hidden service descriptor/protocol versions.
    - Make memory debugging information describe more about history
      of cell allocation, so we can help reduce our memory use.

  o Deprecated features (controller):
    - The status/version/num-versioning and status/version/num-concurring
      GETINFO options are no longer useful in the v3 directory protocol:
      treat them as deprecated, and warn when they're used.

  o Minor bugfixes:
    - When our consensus networkstatus has been expired for a while, stop
      being willing to build circuits using it. Fixes bug 401. Bugfix
      on 0.1.2.x.
    - Directory caches now fetch certificates from all authorities
      listed in a networkstatus consensus, even when they do not
      recognize them. Fixes bug 571. Bugfix on 0.2.0.x.
    - When connecting to a bridge without specifying its key, insert
      the connection into the identity-to-connection map as soon as
      a key is learned. Fixes bug 574. Bugfix on 0.2.0.x.
    - Detect versions of OS X where malloc_good_size() is present in the
      library but never actually declared. Resolves bug 587. Bugfix
      on 0.2.0.x.
    - Stop incorrectly truncating zlib responses to directory authority
      signature download requests. Fixes bug 593. Bugfix on 0.2.0.x.
    - Stop recommending that every server operator send mail to tor-ops.
      Resolves bug 597. Bugfix on 0.1.2.x.
    - Don't trigger an assert if we start a directory authority with a
      private IP address (like 127.0.0.1).
    - Avoid possible failures when generating a directory with routers
      with over-long versions strings, or too many flags set. Bugfix
      on 0.1.2.x.
    - If an attempt to launch a DNS resolve request over the control
      port fails because we have overrun the limit on the number of
      connections, tell the controller that the request has failed.
    - Avoid using too little bandwidth when our clock skips a few
      seconds. Bugfix on 0.1.2.x.
    - Fix shell error when warning about missing packages in configure
      script, on Fedora or Red Hat machines. Bugfix on 0.2.0.x.
    - Do not become confused when receiving a spurious VERSIONS-like
      cell from a confused v1 client.  Bugfix on 0.2.0.x.
    - Re-fetch v2 (as well as v0) rendezvous descriptors when all
      introduction points for a hidden service have failed. Patch from
      Karsten Loesing. Bugfix on 0.2.0.x.

  o Code simplifications and refactoring:
    - Remove some needless generality from cpuworker code, for improved
      type-safety.
    - Stop overloading the circuit_t.onionskin field for both "onionskin
      from a CREATE cell that we are waiting for a cpuworker to be
      assigned" and "onionskin from an EXTEND cell that we are going to
      send to an OR as soon as we are connected". Might help with bug 600.
    - Add an in-place version of aes_crypt() so that we can avoid doing a
      needless memcpy() call on each cell payload.


Changes in version 0.2.0.18-alpha - 2008-01-25
  Tor 0.2.0.18-alpha adds a sixth v3 directory authority run by CCC,
  fixes a big memory leak in 0.2.0.17-alpha, and adds new config options
  that can warn or reject connections to ports generally associated with
  vulnerable-plaintext protocols.

  o New directory authorities:
    - Set up dannenberg (run by CCC) as the sixth v3 directory
      authority.

  o Major bugfixes:
    - Fix a major memory leak when attempting to use the v2 TLS
      handshake code. Bugfix on 0.2.0.x; fixes bug 589.
    - We accidentally enabled the under-development v2 TLS handshake
      code, which was causing log entries like "TLS error while
      renegotiating handshake". Disable it again. Resolves bug 590.
    - We were computing the wrong Content-Length: header for directory
      responses that need to be compressed on the fly, causing clients
      asking for those items to always fail. Bugfix on 0.2.0.x; partially
      fixes bug 593.

  o Major features:
    - Avoid going directly to the directory authorities even if you're a
      relay, if you haven't found yourself reachable yet or if you've
      decided not to advertise your dirport yet. Addresses bug 556.
    - If we've gone 12 hours since our last bandwidth check, and we
      estimate we have less than 50KB bandwidth capacity but we could
      handle more, do another bandwidth test.
    - New config options WarnPlaintextPorts and RejectPlaintextPorts so
      Tor can warn and/or refuse connections to ports commonly used with
      vulnerable-plaintext protocols. Currently we warn on ports 23,
      109, 110, and 143, but we don't reject any.

  o Minor bugfixes:
    - When we setconf ClientOnly to 1, close any current OR and Dir
      listeners. Reported by mwenge.
    - When we get a consensus that's been signed by more people than
      we expect, don't log about it; it's not a big deal. Reported
      by Kyle Williams.

  o Minor features:
    - Don't answer "/tor/networkstatus-bridges" directory requests if
      the request isn't encrypted.
    - Make "ClientOnly 1" config option disable directory ports too.
    - Patches from Karsten Loesing to make v2 hidden services more
      robust: work even when there aren't enough HSDir relays available;
      retry when a v2 rend desc fetch fails; but don't retry if we
      already have a usable v0 rend desc.


Changes in version 0.2.0.17-alpha - 2008-01-17
  Tor 0.2.0.17-alpha makes the tarball build cleanly again (whoops).

  o Compile fixes:
    - Make the tor-gencert man page get included correctly in the tarball.


Changes in version 0.2.0.16-alpha - 2008-01-17
  Tor 0.2.0.16-alpha adds a fifth v3 directory authority run by Karsten
  Loesing, and generally cleans up a lot of features and minor bugs.

  o New directory authorities:
    - Set up gabelmoo (run by Karsten Loesing) as the fifth v3 directory
      authority.

  o Major performance improvements:
    - Switch our old ring buffer implementation for one more like that
      used by free Unix kernels. The wasted space in a buffer with 1mb
      of data will now be more like 8k than 1mb. The new implementation
      also avoids realloc();realloc(); patterns that can contribute to
      memory fragmentation.

  o Minor features:
    - Configuration files now accept C-style strings as values. This
      helps encode characters not allowed in the current configuration
      file format, such as newline or #. Addresses bug 557.
    - Although we fixed bug 539 (where servers would send HTTP status 503
      responses _and_ send a body too), there are still servers out
      there that haven't upgraded. Therefore, make clients parse such
      bodies when they receive them.
    - When we're not serving v2 directory information, there is no reason
      to actually keep any around. Remove the obsolete files and directory
      on startup if they are very old and we aren't going to serve them.

  o Minor performance improvements:
    - Reference-count and share copies of address policy entries; only 5%
      of them were actually distinct.
    - Never walk through the list of logs if we know that no log is
      interested in a given message.

  o Minor bugfixes:
    - When an authority has not signed a consensus, do not try to
      download a nonexistent "certificate with key 00000000". Bugfix
      on 0.2.0.x. Fixes bug 569.
    - Fix a rare assert error when we're closing one of our threads:
      use a mutex to protect the list of logs, so we never write to the
      list as it's being freed. Bugfix on 0.1.2.x. Fixes the very rare
      bug 575, which is kind of the revenge of bug 222.
    - Patch from Karsten Loesing to complain less at both the client
      and the relay when a relay used to have the HSDir flag but doesn't
      anymore, and we try to upload a hidden service descriptor.
    - Stop leaking one cert per TLS context. Fixes bug 582. Bugfix on
      0.2.0.15-alpha.
    - Do not try to download missing certificates until we have tried
      to check our fallback consensus. Fixes bug 583.
    - Make bridges round reported GeoIP stats info up to the nearest
      estimate, not down. Now we can distinguish between "0 people from
      this country" and "1 person from this country".
    - Avoid a spurious free on base64 failure. Bugfix on 0.1.2.
    - Avoid possible segfault if key generation fails in
      crypto_pk_hybrid_encrypt. Bugfix on 0.2.0.
    - Avoid segfault in the case where a badly behaved v2 versioning
      directory sends a signed networkstatus with missing client-versions.
      Bugfix on 0.1.2.
    - Avoid segfaults on certain complex invocations of
      router_get_by_hexdigest(). Bugfix on 0.1.2.
    - Correct bad index on array access in parse_http_time(). Bugfix
      on 0.2.0.
    - Fix possible bug in vote generation when server versions are present
      but client versions are not.
    - Fix rare bug on REDIRECTSTREAM control command when called with no
      port set: it could erroneously report an error when none had
      happened.
    - Avoid bogus crash-prone, leak-prone tor_realloc when we're
      compressing large objects and find ourselves with more than 4k
      left over. Bugfix on 0.2.0.
    - Fix a small memory leak when setting up a hidden service.
    - Fix a few memory leaks that could in theory happen under bizarre
      error conditions.
    - Fix an assert if we post a general-purpose descriptor via the
      control port but that descriptor isn't mentioned in our current
      network consensus. Bug reported by Jon McLachlan; bugfix on
      0.2.0.9-alpha.

  o Minor features (controller):
    - Get NS events working again. Patch from tup.
    - The GETCONF command now escapes and quotes configuration values
      that don't otherwise fit into the torrc file.
    - The SETCONF command now handles quoted values correctly.

  o Minor features (directory authorities):
    - New configuration options to override default maximum number of
      servers allowed on a single IP address. This is important for
      running a test network on a single host.
    - Actually implement the -s option to tor-gencert.
    - Add a manual page for tor-gencert.

  o Minor features (bridges):
    - Bridge authorities no longer serve bridge descriptors over
      unencrypted connections.

  o Minor features (other):
    - Add hidden services and DNSPorts to the list of things that make
      Tor accept that it has running ports. Change starting Tor with no
      ports from a fatal error to a warning; we might change it back if
      this turns out to confuse anybody. Fixes bug 579.


Changes in version 0.1.2.19 - 2008-01-17
  Tor 0.1.2.19 fixes a huge memory leak on exit relays, makes the default
  exit policy a little bit more conservative so it's safer to run an
  exit relay on a home system, and fixes a variety of smaller issues.

  o Security fixes:
    - Exit policies now reject connections that are addressed to a
      relay's public (external) IP address too, unless
      ExitPolicyRejectPrivate is turned off. We do this because too
      many relays are running nearby to services that trust them based
      on network address.

  o Major bugfixes:
    - When the clock jumps forward a lot, do not allow the bandwidth
      buckets to become negative. Fixes bug 544.
    - Fix a memory leak on exit relays; we were leaking a cached_resolve_t
      on every successful resolve. Reported by Mike Perry.
    - Purge old entries from the "rephist" database and the hidden
      service descriptor database even when DirPort is zero.
    - Stop thinking that 0.1.2.x directory servers can handle "begin_dir"
      requests. Should ease bugs 406 and 419 where 0.1.2.x relays are
      crashing or mis-answering these requests.
    - When we decide to send a 503 response to a request for servers, do
      not then also send the server descriptors: this defeats the whole
      purpose. Fixes bug 539.

  o Minor bugfixes:
    - Changing the ExitPolicyRejectPrivate setting should cause us to
      rebuild our server descriptor.
    - Fix handling of hex nicknames when answering controller requests for
      networkstatus by name, or when deciding whether to warn about
      unknown routers in a config option. (Patch from mwenge.)
    - Fix a couple of hard-to-trigger autoconf problems that could result
      in really weird results on platforms whose sys/types.h files define
      nonstandard integer types.
    - Don't try to create the datadir when running --verify-config or
      --hash-password. Resolves bug 540.
    - If we were having problems getting a particular descriptor from the
      directory caches, and then we learned about a new descriptor for
      that router, we weren't resetting our failure count. Reported
      by lodger.
    - Although we fixed bug 539 (where servers would send HTTP status 503
      responses _and_ send a body too), there are still servers out there
      that haven't upgraded. Therefore, make clients parse such bodies
      when they receive them.
    - Run correctly on systems where rlim_t is larger than unsigned long.
      This includes some 64-bit systems.
    - Run correctly on platforms (like some versions of OS X 10.5) where
      the real limit for number of open files is OPEN_FILES, not rlim_max
      from getrlimit(RLIMIT_NOFILES).
    - Avoid a spurious free on base64 failure.
    - Avoid segfaults on certain complex invocations of
      router_get_by_hexdigest().
    - Fix rare bug on REDIRECTSTREAM control command when called with no
      port set: it could erroneously report an error when none had
      happened.


Changes in version 0.2.0.15-alpha - 2007-12-25
  Tor 0.2.0.14-alpha and 0.2.0.15-alpha fix a bunch of bugs with the
  features added in 0.2.0.13-alpha.

  o Major bugfixes:
    - Fix several remotely triggerable asserts based on DirPort requests
      for a v2 or v3 networkstatus object before we were prepared. This
      was particularly bad for 0.2.0.13 and later bridge relays, who
      would never have a v2 networkstatus and would thus always crash
      when used. Bugfixes on 0.2.0.x.
    - Estimate the v3 networkstatus size more accurately, rather than
      estimating it at zero bytes and giving it artificially high priority
      compared to other directory requests. Bugfix on 0.2.0.x.

  o Minor bugfixes:
    - Fix configure.in logic for cross-compilation.
    - When we load a bridge descriptor from the cache, and it was
      previously unreachable, mark it as retriable so we won't just
      ignore it. Also, try fetching a new copy immediately. Bugfixes
      on 0.2.0.13-alpha.
    - The bridge GeoIP stats were counting other relays, for example
      self-reachability and authority-reachability tests.

  o Minor features:
    - Support compilation to target iPhone; patch from cjacker huang.
      To build for iPhone, pass the --enable-iphone option to configure.


Changes in version 0.2.0.14-alpha - 2007-12-23
  o Major bugfixes:
    - Fix a crash on startup if you install Tor 0.2.0.13-alpha fresh
      without a datadirectory from a previous Tor install. Reported
      by Zax.
    - Fix a crash when we fetch a descriptor that turns out to be
      unexpected (it used to be in our networkstatus when we started
      fetching it, but it isn't in our current networkstatus), and we
      aren't using bridges. Bugfix on 0.2.0.x.
    - Fix a crash when accessing hidden services: it would work the first
      time you use a given introduction point for your service, but
      on subsequent requests we'd be using garbage memory. Fixed by
      Karsten Loesing. Bugfix on 0.2.0.13-alpha.
    - Fix a crash when we load a bridge descriptor from disk but we don't
      currently have a Bridge line for it in our torrc. Bugfix on
      0.2.0.13-alpha.

  o Major features:
    - If bridge authorities set BridgePassword, they will serve a
      snapshot of known bridge routerstatuses from their DirPort to
      anybody who knows that password. Unset by default.

  o Minor bugfixes:
    - Make the unit tests build again.
    - Make "GETINFO/desc-annotations/id/<OR digest>" actually work.
    - Make PublishServerDescriptor default to 1, so the default doesn't
      have to change as we invent new directory protocol versions.
    - Fix test for rlim_t on OSX 10.3: sys/resource.h doesn't want to
      be included unless sys/time.h is already included.  Fixes
      bug 553.  Bugfix on 0.2.0.x.
    - If we receive a general-purpose descriptor and then receive an
      identical bridge-purpose descriptor soon after, don't discard
      the next one as a duplicate.

  o Minor features:
    - If BridgeRelay is set to 1, then the default for
      PublishServerDescriptor is now "bridge" rather than "v2,v3".
    - If the user sets RelayBandwidthRate but doesn't set
      RelayBandwidthBurst, then make them equal rather than erroring out.


Changes in version 0.2.0.13-alpha - 2007-12-21
  Tor 0.2.0.13-alpha adds a fourth v3 directory authority run by Geoff
  Goodell, fixes many more bugs, and adds a lot of infrastructure for
  upcoming features.

  o New directory authorities:
    - Set up lefkada (run by Geoff Goodell) as the fourth v3 directory
      authority.

  o Major bugfixes:
    - Only update guard status (usable / not usable) once we have
      enough directory information. This was causing us to always pick
      two new guards on startup (bugfix on 0.2.0.9-alpha), and it was
      causing us to discard all our guards on startup if we hadn't been
      running for a few weeks (bugfix on 0.1.2.x). Fixes bug 448.
    - Purge old entries from the "rephist" database and the hidden
      service descriptor databases even when DirPort is zero. Bugfix
      on 0.1.2.x.
    - We were ignoring our RelayBandwidthRate for the first 30 seconds
      after opening a circuit -- even a relayed circuit. Bugfix on
      0.2.0.3-alpha.
    - Stop thinking that 0.1.2.x directory servers can handle "begin_dir"
      requests. Should ease bugs 406 and 419 where 0.1.2.x relays are
      crashing or mis-answering these types of requests.
    - Relays were publishing their server descriptor to v1 and v2
      directory authorities, but they didn't try publishing to v3-only
      authorities. Fix this; and also stop publishing to v1 authorities.
      Bugfix on 0.2.0.x.
    - When we were reading router descriptors from cache, we were ignoring
      the annotations -- so for example we were reading in bridge-purpose
      descriptors as general-purpose descriptors. Bugfix on 0.2.0.8-alpha.
    - When we decided to send a 503 response to a request for servers, we
      were then also sending the server descriptors: this defeats the
      whole purpose. Fixes bug 539; bugfix on 0.1.2.x.

  o Major features:
    - Bridge relays now behave like clients with respect to time
      intervals for downloading new consensus documents -- otherwise they
      stand out. Bridge users now wait until the end of the interval,
      so their bridge relay will be sure to have a new consensus document.
    - Three new config options (AlternateDirAuthority,
      AlternateBridgeAuthority, and AlternateHSAuthority) that let the
      user selectively replace the default directory authorities by type,
      rather than the all-or-nothing replacement that DirServer offers.
    - Tor can now be configured to read a GeoIP file from disk in one
      of two formats. This can be used by controllers to map IP addresses
      to countries. Eventually, it may support exit-by-country.
    - When possible, bridge relays remember which countries users
      are coming from, and report aggregate information in their
      extra-info documents, so that the bridge authorities can learn
      where Tor is blocked.
    - Bridge directory authorities now do reachability testing on the
      bridges they know. They provide router status summaries to the
      controller via "getinfo ns/purpose/bridge", and also dump summaries
      to a file periodically.
    - Stop fetching directory info so aggressively if your DirPort is
      on but your ORPort is off; stop fetching v2 dir info entirely.
      You can override these choices with the new FetchDirInfoEarly
      config option.

  o Minor bugfixes:
    - The fix in 0.2.0.12-alpha cleared the "hsdir" flag in v3 network
      consensus documents when there are too many relays at a single
      IP address. Now clear it in v2 network status documents too, and
      also clear it in routerinfo_t when the relay is no longer listed
      in the relevant networkstatus document.
    - Don't crash if we get an unexpected value for the
      PublishServerDescriptor config option. Reported by Matt Edman;
      bugfix on 0.2.0.9-alpha.
    - Our new v2 hidden service descriptor format allows descriptors
      that have no introduction points. But Tor crashed when we tried
      to build a descriptor with no intro points (and it would have
      crashed if we had tried to parse one). Bugfix on 0.2.0.x; patch
      by Karsten Loesing.
    - Fix building with dmalloc 5.5.2 with glibc.
    - Reject uploaded descriptors and extrainfo documents if they're
      huge. Otherwise we'll cache them all over the network and it'll
      clog everything up. Reported by Aljosha Judmayer.
    - Check for presence of s6_addr16 and s6_addr32 fields in in6_addr
      via autoconf. Should fix compile on solaris. Bugfix on 0.2.0.x.
    - When the DANGEROUS_VERSION controller status event told us we're
      running an obsolete version, it used the string "OLD" to describe
      it. Yet the "getinfo" interface used the string "OBSOLETE". Now use
      "OBSOLETE" in both cases. Bugfix on 0.1.2.x.
    - If we can't expand our list of entry guards (e.g. because we're
      using bridges or we have StrictEntryNodes set), don't mark relays
      down when they fail a directory request. Otherwise we're too quick
      to mark all our entry points down. Bugfix on 0.1.2.x.
    - Fix handling of hex nicknames when answering controller requests for
      networkstatus by name, or when deciding whether to warn about unknown
      routers in a config option. Bugfix on 0.1.2.x. (Patch from mwenge.)
    - Fix a couple of hard-to-trigger autoconf problems that could result
      in really weird results on platforms whose sys/types.h files define
      nonstandard integer types. Bugfix on 0.1.2.x.
    - Fix compilation with --disable-threads set. Bugfix on 0.2.0.x.
    - Don't crash on name lookup when we have no current consensus.  Fixes
      bug 538; bugfix on 0.2.0.x.
    - Only Tors that want to mirror the v2 directory info should
      create the "cached-status" directory in their datadir. (All Tors
      used to create it.) Bugfix on 0.2.0.9-alpha.
    - Directory authorities should only automatically download Extra Info
      documents if they're v1, v2, or v3 authorities. Bugfix on 0.1.2.x.

  o Minor features:
    - On the USR1 signal, when dmalloc is in use, log the top 10 memory
      consumers. (We already do this on HUP.)
    - Authorities and caches fetch the v2 networkstatus documents
      less often, now that v3 is encouraged.
    - Add a new config option BridgeRelay that specifies you want to
      be a bridge relay. Right now the only difference is that it makes
      you answer begin_dir requests, and it makes you cache dir info,
      even if your DirPort isn't on.
    - Add "GETINFO/desc-annotations/id/<OR digest>" so controllers can
      ask about source, timestamp of arrival, purpose, etc. We need
      something like this to help Vidalia not do GeoIP lookups on bridge
      addresses.
    - Allow multiple HashedControlPassword config lines, to support
      multiple controller passwords.
    - Authorities now decide whether they're authoritative for a given
      router based on the router's purpose.
    - New config options AuthDirBadDir and AuthDirListBadDirs for
      authorities to mark certain relays as "bad directories" in the
      networkstatus documents. Also supports the "!baddir" directive in
      the approved-routers file.


Changes in version 0.2.0.12-alpha - 2007-11-16
  This twelfth development snapshot fixes some more build problems as
  well as a few minor bugs.

  o Compile fixes:
    - Make it build on OpenBSD again. Patch from tup.
    - Substitute BINDIR and LOCALSTATEDIR in scripts. Fixes
      package-building for Red Hat, OS X, etc.

  o Minor bugfixes (on 0.1.2.x):
    - Changing the ExitPolicyRejectPrivate setting should cause us to
      rebuild our server descriptor.

  o Minor bugfixes (on 0.2.0.x):
    - When we're lacking a consensus, don't try to perform rendezvous
      operations. Reported by Karsten Loesing.
    - Fix a small memory leak whenever we decide against using a
      newly picked entry guard. Reported by Mike Perry.
    - When authorities detected more than two relays running on the same
      IP address, they were clearing all the status flags but forgetting
      to clear the "hsdir" flag. So clients were being told that a
      given relay was the right choice for a v2 hsdir lookup, yet they
      never had its descriptor because it was marked as 'not running'
      in the consensus.
    - If we're trying to fetch a bridge descriptor and there's no way
      the bridge authority could help us (for example, we don't know
      a digest, or there is no bridge authority), don't be so eager to
      fall back to asking the bridge authority.
    - If we're using bridges or have strictentrynodes set, and our
      chosen exit is in the same family as all our bridges/entry guards,
      then be flexible about families.

  o Minor features:
    - When we negotiate a v2 link-layer connection (not yet implemented),
      accept RELAY_EARLY cells and turn them into RELAY cells if we've
      negotiated a v1 connection for their next step. Initial code for
      proposal 110.


Changes in version 0.2.0.11-alpha - 2007-11-12
  This eleventh development snapshot fixes some build problems with
  the previous snapshot. It also includes a more secure-by-default exit
  policy for relays, fixes an enormous memory leak for exit relays, and
  fixes another bug where servers were falling out of the directory list.

  o Security fixes:
    - Exit policies now reject connections that are addressed to a
      relay's public (external) IP address too, unless
      ExitPolicyRejectPrivate is turned off. We do this because too
      many relays are running nearby to services that trust them based
      on network address. Bugfix on 0.1.2.x.

  o Major bugfixes:
    - Fix a memory leak on exit relays; we were leaking a cached_resolve_t
      on every successful resolve. Reported by Mike Perry; bugfix
      on 0.1.2.x.
    - On authorities, never downgrade to old router descriptors simply
      because they're listed in the consensus. This created a catch-22
      where we wouldn't list a new descriptor because there was an
      old one in the consensus, and we couldn't get the new one in the
      consensus because we wouldn't list it. Possible fix for bug 548.
      Also, this might cause bug 543 to appear on authorities; if so,
      we'll need a band-aid for that. Bugfix on 0.2.0.9-alpha.

  o Packaging fixes on 0.2.0.10-alpha:
    - We were including instructions about what to do with the
      src/config/fallback-consensus file, but we weren't actually
      including it in the tarball. Disable all of that for now.

  o Minor features:
    - Allow people to say PreferTunnelledDirConns rather than
      PreferTunneledDirConns, for those alternate-spellers out there.

  o Minor bugfixes:
    - Don't reevaluate all the information from our consensus document
      just because we've downloaded a v2 networkstatus that we intend
      to cache. Fixes bug 545; bugfix on 0.2.0.x.


Changes in version 0.2.0.10-alpha - 2007-11-10
  This tenth development snapshot adds a third v3 directory authority
  run by Mike Perry, adds most of Karsten Loesing's new hidden service
  descriptor format, fixes a bad crash bug and new bridge bugs introduced
  in 0.2.0.9-alpha, fixes many bugs with the v3 directory implementation,
  fixes some minor memory leaks in previous 0.2.0.x snapshots, and
  addresses many more minor issues.

  o New directory authorities:
    - Set up ides (run by Mike Perry) as the third v3 directory authority.

  o Major features:
    - Allow tunnelled directory connections to ask for an encrypted
      "begin_dir" connection or an anonymized "uses a full Tor circuit"
      connection independently. Now we can make anonymized begin_dir
      connections for (e.g.) more secure hidden service posting and
      fetching.
    - More progress on proposal 114: code from Karsten Loesing to
      implement new hidden service descriptor format.
    - Raise the default BandwidthRate/BandwidthBurst to 5MB/10MB, to
      accommodate the growing number of servers that use the default
      and are reaching it.
    - Directory authorities use a new formula for selecting which nodes
      to advertise as Guards: they must be in the top 7/8 in terms of
      how long we have known about them, and above the median of those
      nodes in terms of weighted fractional uptime.
    - Make "not enough dir info yet" warnings describe *why* Tor feels
      it doesn't have enough directory info yet.

  o Major bugfixes:
    - Stop servers from crashing if they set a Family option (or
      maybe in other situations too). Bugfix on 0.2.0.9-alpha; reported
      by Fabian Keil.
    - Make bridge users work again -- the move to v3 directories in
      0.2.0.9-alpha had introduced a number of bugs that made bridges
      no longer work for clients.
    - When the clock jumps forward a lot, do not allow the bandwidth
      buckets to become negative. Bugfix on 0.1.2.x; fixes bug 544.

  o Major bugfixes (v3 dir, bugfixes on 0.2.0.9-alpha):
    - When the consensus lists a router descriptor that we previously were
      mirroring, but that we considered non-canonical, reload the
      descriptor as canonical. This fixes bug 543 where Tor servers
      would start complaining after a few days that they don't have
      enough directory information to build a circuit.
    - Consider replacing the current consensus when certificates arrive
      that make the pending consensus valid. Previously, we were only
      considering replacement when the new certs _didn't_ help.
    - Fix an assert error on startup if we didn't already have the
      consensus and certs cached in our datadirectory: we were caching
      the consensus in consensus_waiting_for_certs but then free'ing it
      right after.
    - Avoid sending a request for "keys/fp" (for which we'll get a 400 Bad
      Request) if we need more v3 certs but we've already got pending
      requests for all of them.
    - Correctly back off from failing certificate downloads. Fixes
      bug 546.
    - Authorities don't vote on the Running flag if they have been running
      for less than 30 minutes themselves. Fixes bug 547, where a newly
      started authority would vote that everyone was down.

  o New requirements:
    - Drop support for OpenSSL version 0.9.6. Just about nobody was using
      it, it had no AES, and it hasn't seen any security patches since
      2004.

  o Minor features:
    - Clients now hold circuitless TLS connections open for 1.5 times
      MaxCircuitDirtiness (15 minutes), since it is likely that they'll
      rebuild a new circuit over them within that timeframe. Previously,
      they held them open only for KeepalivePeriod (5 minutes).
    - Use "If-Modified-Since" to avoid retrieving consensus
      networkstatuses that we already have.
    - When we have no consensus, check FallbackNetworkstatusFile (defaults
      to $PREFIX/share/tor/fallback-consensus) for a consensus.  This way
      we start knowing some directory caches.
    - When we receive a consensus from the future, warn about skew.
    - Improve skew reporting: try to give the user a better log message
      about how skewed they are, and how much this matters.
    - When we have a certificate for an authority, believe that
      certificate's claims about the authority's IP address.
    - New --quiet command-line option to suppress the default console log.
      Good in combination with --hash-password.
    - Authorities send back an X-Descriptor-Not-New header in response to
      an accepted-but-discarded descriptor upload.  Partially implements
      fix for bug 535.
    - Make the log message for "tls error. breaking." more useful.
    - Better log messages about certificate downloads, to attempt to
      track down the second incarnation of bug 546.

  o Minor features (bridges):
    - If bridge users set UpdateBridgesFromAuthority, but the digest
      they ask for is a 404 from the bridge authority, they now fall
      back to trying the bridge directly.
    - Bridges now use begin_dir to publish their server descriptor to
      the bridge authority, even when they haven't set TunnelDirConns.

  o Minor features (controller):
    - When reporting clock skew, and we know that the clock is _at least
      as skewed_ as some value, but we don't know the actual value,
      report the value as a "minimum skew."

  o Utilities:
    - Update linux-tor-prio.sh script to allow QoS based on the uid of
      the Tor process. Patch from Marco Bonetti with tweaks from Mike
      Perry.

  o Minor bugfixes:
    - Refuse to start if both ORPort and UseBridges are set. Bugfix
      on 0.2.0.x, suggested by Matt Edman.
    - Don't stop fetching descriptors when FetchUselessDescriptors is
      set, even if we stop asking for circuits. Bugfix on 0.1.2.x;
      reported by tup and ioerror.
    - Better log message on vote from unknown authority.
    - Don't log "Launching 0 request for 0 router" message.

  o Minor bugfixes (memory leaks):
    - Stop leaking memory every time we parse a v3 certificate. Bugfix
      on 0.2.0.1-alpha.
    - Stop leaking memory every time we load a v3 certificate. Bugfix
      on 0.2.0.1-alpha. Fixes bug 536.
    - Stop leaking a cached networkstatus on exit.  Bugfix on
      0.2.0.3-alpha.
    - Stop leaking voter information every time we free a consensus.
      Bugfix on 0.2.0.3-alpha.
    - Stop leaking signed data every time we check a voter signature.
      Bugfix on 0.2.0.3-alpha.
    - Stop leaking a signature every time we fail to parse a consensus or
      a vote.  Bugfix on 0.2.0.3-alpha.
    - Stop leaking v2_download_status_map on shutdown.  Bugfix on
      0.2.0.9-alpha.
    - Stop leaking conn->nickname every time we make a connection to a
      Tor relay without knowing its expected identity digest (e.g. when
      using bridges). Bugfix on 0.2.0.3-alpha.

  - Minor bugfixes (portability):
    - Run correctly on platforms where rlim_t is larger than unsigned
      long, and/or where the real limit for number of open files is
      OPEN_FILES, not rlim_max from getrlimit(RLIMIT_NOFILES). In
      particular, these may be needed for OS X 10.5.


Changes in version 0.1.2.18 - 2007-10-28
  Tor 0.1.2.18 fixes many problems including crash bugs, problems with
  hidden service introduction that were causing huge delays, and a big
  bug that was causing some servers to disappear from the network status
  lists for a few hours each day.

  o Major bugfixes (crashes):
    - If a connection is shut down abruptly because of something that
      happened inside connection_flushed_some(), do not call
      connection_finished_flushing(). Should fix bug 451:
      "connection_stop_writing: Assertion conn->write_event failed"
      Bugfix on 0.1.2.7-alpha.
    - Fix possible segfaults in functions called from
      rend_process_relay_cell().

  o Major bugfixes (hidden services):
    - Hidden services were choosing introduction points uniquely by
      hexdigest, but when constructing the hidden service descriptor
      they merely wrote the (potentially ambiguous) nickname.
    - Clients now use the v2 intro format for hidden service
      connections: they specify their chosen rendezvous point by identity
      digest rather than by (potentially ambiguous) nickname. These
      changes could speed up hidden service connections dramatically.

  o Major bugfixes (other):
    - Stop publishing a new server descriptor just because we get a
      HUP signal. This led (in a roundabout way) to some servers getting
      dropped from the networkstatus lists for a few hours each day.
    - When looking for a circuit to cannibalize, consider family as well
      as identity. Fixes bug 438. Bugfix on 0.1.0.x (which introduced
      circuit cannibalization).
    - When a router wasn't listed in a new networkstatus, we were leaving
      the flags for that router alone -- meaning it remained Named,
      Running, etc -- even though absence from the networkstatus means
      that it shouldn't be considered to exist at all anymore. Now we
      clear all the flags for routers that fall out of the networkstatus
      consensus. Fixes bug 529.

  o Minor bugfixes:
    - Don't try to access (or alter) the state file when running
      --list-fingerprint or --verify-config or --hash-password. Resolves
      bug 499.
    - When generating information telling us how to extend to a given
      router, do not try to include the nickname if it is
      absent. Resolves bug 467.
    - Fix a user-triggerable segfault in expand_filename(). (There isn't
      a way to trigger this remotely.)
    - When sending a status event to the controller telling it that an
      OR address is reachable, set the port correctly. (Previously we
      were reporting the dir port.)
    - Fix a minor memory leak whenever a controller sends the PROTOCOLINFO
      command. Bugfix on 0.1.2.17.
    - When loading bandwidth history, do not believe any information in
      the future. Fixes bug 434.
    - When loading entry guard information, do not believe any information
      in the future.
    - When we have our clock set far in the future and generate an
      onion key, then re-set our clock to be correct, we should not stop
      the onion key from getting rotated.
    - On some platforms, accept() can return a broken address. Detect
      this more quietly, and deal accordingly. Fixes bug 483.
    - It's not actually an error to find a non-pending entry in the DNS
      cache when canceling a pending resolve. Don't log unless stuff
      is fishy. Resolves bug 463.
    - Don't reset trusted dir server list when we set a configuration
      option. Patch from Robert Hogan.
    - Don't try to create the datadir when running --verify-config or
      --hash-password. Resolves bug 540.


Changes in version 0.2.0.9-alpha - 2007-10-24
  This ninth development snapshot switches clients to the new v3 directory
  system; allows servers to be listed in the network status even when they
  have the same nickname as a registered server; and fixes many other
  bugs including a big one that was causing some servers to disappear
  from the network status lists for a few hours each day.

  o Major features (directory system):
    - Clients now download v3 consensus networkstatus documents instead
      of v2 networkstatus documents. Clients and caches now base their
      opinions about routers on these consensus documents. Clients only
      download router descriptors listed in the consensus.
    - Authorities now list servers who have the same nickname as
      a different named server, but list them with a new flag,
      "Unnamed". Now we can list servers that happen to pick the same
      nickname as a server that registered two years ago and then
      disappeared. Partially implements proposal 122.
    - If the consensus lists a router as "Unnamed", the name is assigned
      to a different router: do not identify the router by that name.
      Partially implements proposal 122.
    - Authorities can now come to a consensus on which method to use to
      compute the consensus. This gives us forward compatibility.

  o Major bugfixes:
    - Stop publishing a new server descriptor just because we HUP or
      when we find our DirPort to be reachable but won't actually publish
      it. New descriptors without any real changes are dropped by the
      authorities, and can screw up our "publish every 18 hours" schedule.
      Bugfix on 0.1.2.x.
    - When a router wasn't listed in a new networkstatus, we were leaving
      the flags for that router alone -- meaning it remained Named,
      Running, etc -- even though absence from the networkstatus means
      that it shouldn't be considered to exist at all anymore. Now we
      clear all the flags for routers that fall out of the networkstatus
      consensus. Fixes bug 529; bugfix on 0.1.2.x.
    - Fix awful behavior in DownloadExtraInfo option where we'd fetch
      extrainfo documents and then discard them immediately for not
      matching the latest router. Bugfix on 0.2.0.1-alpha.

  o Minor features (v3 directory protocol):
    - Allow tor-gencert to generate a new certificate without replacing
      the signing key.
    - Allow certificates to include an address.
    - When we change our directory-cache settings, reschedule all voting
      and download operations.
    - Reattempt certificate downloads immediately on failure, as long as
      we haven't failed a threshold number of times yet.
    - Delay retrying consensus downloads while we're downloading
      certificates to verify the one we just got.  Also, count getting a
      consensus that we already have (or one that isn't valid) as a failure,
      and count failing to get the certificates after 20 minutes as a
      failure.
    - Build circuits and download descriptors even if our consensus is a
      little expired. (This feature will go away once authorities are
      more reliable.)

  o Minor features (router descriptor cache):
    - If we find a cached-routers file that's been sitting around for more
      than 28 days unmodified, then most likely it's a leftover from
      when we upgraded to 0.2.0.8-alpha. Remove it. It has no good
      routers anyway.
    - When we (as a cache) download a descriptor because it was listed
      in a consensus, remember when the consensus was supposed to expire,
      and don't expire the descriptor until then.

  o Minor features (performance):
    - Call routerlist_remove_old_routers() much less often. This should
      speed startup, especially on directory caches.
    - Don't try to launch new descriptor downloads quite so often when we
      already have enough directory information to build circuits.
    - Base64 decoding was actually showing up on our profile when parsing
      the initial descriptor file; switch to an in-process all-at-once
      implementation that's about 3.5x times faster than calling out to
      OpenSSL.

  o Minor features (compilation):
    - Detect non-ASCII platforms (if any still exist) and refuse to
      build there: some of our code assumes that 'A' is 65 and so on.

  o Minor bugfixes (v3 directory authorities, bugfixes on 0.2.0.x):
    - Make the "next period" votes into "current period" votes immediately
      after publishing the consensus; avoid a heisenbug that made them
      stick around indefinitely.
    - When we discard a vote as a duplicate, do not report this as
      an error.
    - Treat missing v3 keys or certificates as an error when running as a
      v3 directory authority.
    - When we're configured to be a v3 authority, but we're only listed
      as a non-v3 authority in our DirServer line for ourself, correct
      the listing.
    - If an authority doesn't have a qualified hostname, just put
      its address in the vote. This fixes the problem where we referred to
      "moria on moria:9031."
    - Distinguish between detached signatures for the wrong period, and
      detached signatures for a divergent vote.
    - Fix a small memory leak when computing a consensus.
    - When there's no concensus, we were forming a vote every 30
      minutes, but writing the "valid-after" line in our vote based
      on our configured V3AuthVotingInterval: so unless the intervals
      matched up, we immediately rejected our own vote because it didn't
      start at the voting interval that caused us to construct a vote.

  o Minor bugfixes (v3 directory protocol, bugfixes on 0.2.0.x):
    - Delete unverified-consensus when the real consensus is set.
    - Consider retrying a consensus networkstatus fetch immediately
      after one fails: don't wait 60 seconds to notice.
    - When fetching a consensus as a cache, wait until a newer consensus
      should exist before trying to replace the current one.
    - Use a more forgiving schedule for retrying failed consensus
      downloads than for other types.

  o Minor bugfixes (other directory issues):
    - Correct the implementation of "download votes by digest." Bugfix on
      0.2.0.8-alpha.
    - Authorities no longer send back "400 you're unreachable please fix
      it" errors to Tor servers that aren't online all the time. We're
      supposed to tolerate these servers now. Bugfix on 0.1.2.x.

  o Minor bugfixes (controller):
    - Don't reset trusted dir server list when we set a configuration
      option. Patch from Robert Hogan; bugfix on 0.1.2.x.
    - Respond to INT and TERM SIGNAL commands before we execute the
      signal, in case the signal shuts us down. We had a patch in
      0.1.2.1-alpha that tried to do this by queueing the response on
      the connection's buffer before shutting down, but that really
      isn't the same thing at all. Bug located by Matt Edman.

  o Minor bugfixes (misc):
    - Correctly check for bad options to the "PublishServerDescriptor"
      config option. Bugfix on 0.2.0.1-alpha; reported by Matt Edman.
    - Stop leaking memory on failing case of base32_decode, and make
      it accept upper-case letters. Bugfixes on 0.2.0.7-alpha.
    - Don't try to download extrainfo documents when we're trying to
      fetch enough directory info to build a circuit: having enough
      info should get priority. Bugfix on 0.2.0.x.
    - Don't complain that "your server has not managed to confirm that its
      ports are reachable" if we haven't been able to build any circuits
      yet. Bug found by spending four hours without a v3 consensus. Bugfix
      on 0.1.2.x.
    - Detect the reason for failing to mmap a descriptor file we just
      wrote, and give a more useful log message.  Fixes bug 533. Bugfix
      on 0.1.2.x.

  o Code simplifications and refactoring:
    - Remove support for the old bw_accounting file: we've been storing
      bandwidth accounting information in the state file since
      0.1.2.5-alpha.  This may result in bandwidth accounting errors
      if you try to upgrade from 0.1.1.x or earlier, or if you try to
      downgrade to 0.1.1.x or earlier.
    - New convenience code to locate a file within the DataDirectory.
    - Move non-authority functionality out of dirvote.c.
    - Refactor the arguments for router_pick_{directory_|trusteddir}server
      so that they all take the same named flags.

  o Utilities
    - Include the "tor-ctrl.sh" bash script by Stefan Behte to provide
      Unix users an easy way to script their Tor process (e.g. by
      adjusting bandwidth based on the time of the day).


Changes in version 0.2.0.8-alpha - 2007-10-12
  This eighth development snapshot fixes a crash bug that's been bothering
  us since February 2007, lets bridge authorities store a list of bridge
  descriptors they've seen, gets v3 directory voting closer to working,
  starts caching v3 directory consensus documents on directory mirrors,
  and fixes a variety of smaller issues including some minor memory leaks.

  o Major features (router descriptor cache):
    - Store routers in a file called cached-descriptors instead of in
      cached-routers. Initialize cached-descriptors from cached-routers
      if the old format is around. The new format allows us to store
      annotations along with descriptors.
    - Use annotations to record the time we received each descriptor, its
      source, and its purpose.
    - Disable the SETROUTERPURPOSE controller command: it is now
      obsolete.
    - Controllers should now specify cache=no or cache=yes when using
      the +POSTDESCRIPTOR command.
    - Bridge authorities now write bridge descriptors to disk, meaning
      we can export them to other programs and begin distributing them
      to blocked users.

  o Major features (directory authorities):
    - When a v3 authority is missing votes or signatures, it now tries
      to fetch them.
    - Directory authorities track weighted fractional uptime as well as
      weighted mean-time-between failures.  WFU is suitable for deciding
      whether a node is "usually up", while MTBF is suitable for deciding
      whether a node is "likely to stay up."  We need both, because
      "usually up" is a good requirement for guards, while "likely to
      stay up" is a good requirement for long-lived connections.

  o Major features (v3 directory system):
    - Caches now download v3 network status documents as needed,
      and download the descriptors listed in them.
    - All hosts now attempt to download and keep fresh v3 authority
      certificates, and re-attempt after failures.
    - More internal-consistency checks for vote parsing.

  o Major bugfixes (crashes):
    - If a connection is shut down abruptly because of something that
      happened inside connection_flushed_some(), do not call
      connection_finished_flushing(). Should fix bug 451. Bugfix on
      0.1.2.7-alpha.

  o Major bugfixes (performance):
    - Fix really bad O(n^2) performance when parsing a long list of
      routers: Instead of searching the entire list for an "extra-info "
      string which usually wasn't there, once for every routerinfo
      we read, just scan lines forward until we find one we like.
      Bugfix on 0.2.0.1.
    - When we add data to a write buffer in response to the data on that
      write buffer getting low because of a flush, do not consider the
      newly added data as a candidate for immediate flushing, but rather
      make it wait until the next round of writing. Otherwise, we flush
      and refill recursively, and a single greedy TLS connection can
      eat all of our bandwidth. Bugfix on 0.1.2.7-alpha.

  o Minor features (v3 authority system):
    - Add more ways for tools to download the votes that lead to the
      current consensus.
    - Send a 503 when low on bandwidth and a vote, consensus, or
      certificate is requested.
    - If-modified-since is now implemented properly for all kinds of
      certificate requests.

  o Minor bugfixes (network statuses):
    - Tweak the implementation of proposal 109 slightly: allow at most
      two Tor servers on the same IP address, except if it's the location
      of a directory authority, in which case allow five. Bugfix on
      0.2.0.3-alpha.

  o Minor bugfixes (controller):
    - When sending a status event to the controller telling it that an
      OR address is reachable, set the port correctly. (Previously we
      were reporting the dir port.) Bugfix on 0.1.2.x.

  o Minor bugfixes (v3 directory system):
    - Fix logic to look up a cert by its signing key digest. Bugfix on
      0.2.0.7-alpha.
    - Only change the reply to a vote to "OK" if it's not already
      set. This gets rid of annoying "400 OK" log messages, which may
      have been masking some deeper issue. Bugfix on 0.2.0.7-alpha.
    - When we get a valid consensus, recompute the voting schedule.
    - Base the valid-after time of a vote on the consensus voting
      schedule, not on our preferred schedule.
    - Make the return values and messages from signature uploads and
      downloads more sensible.
    - Fix a memory leak when serving votes and consensus documents, and
      another when serving certificates.

  o Minor bugfixes (performance):
    - Use a slightly simpler string hashing algorithm (copying Python's
      instead of Java's) and optimize our digest hashing algorithm to take
      advantage of 64-bit platforms and to remove some possibly-costly
      voodoo.
    - Fix a minor memory leak whenever we parse guards from our state
      file. Bugfix on 0.2.0.7-alpha.
    - Fix a minor memory leak whenever we write out a file. Bugfix on
      0.2.0.7-alpha.
    - Fix a minor memory leak whenever a controller sends the PROTOCOLINFO
      command. Bugfix on 0.2.0.5-alpha.

  o Minor bugfixes (portability):
    - On some platforms, accept() can return a broken address. Detect
      this more quietly, and deal accordingly. Fixes bug 483.
    - Stop calling tor_strlower() on uninitialized memory in some cases.
      Bugfix in 0.2.0.7-alpha.

  o Minor bugfixes (usability):
    - Treat some 403 responses from directory servers as INFO rather than
      WARN-severity events.
    - It's not actually an error to find a non-pending entry in the DNS
      cache when canceling a pending resolve. Don't log unless stuff is
      fishy. Resolves bug 463.

  o Minor bugfixes (anonymity):
    - Never report that we've used more bandwidth than we're willing to
      relay: it leaks how much non-relay traffic we're using. Resolves
      bug 516.
    - When looking for a circuit to cannibalize, consider family as well
      as identity. Fixes bug 438. Bugfix on 0.1.0.x (which introduced
      circuit cannibalization).

  o Code simplifications and refactoring:
    - Make a bunch of functions static. Remove some dead code.
    - Pull out about a third of the really big routerlist.c; put it in a
      new module, networkstatus.c.
    - Merge the extra fields in local_routerstatus_t back into
      routerstatus_t: we used to need one routerstatus_t for each
      authority's opinion, plus a local_routerstatus_t for the locally
      computed consensus opinion. To save space, we put the locally
      modified fields into local_routerstatus_t, and only the common
      stuff into routerstatus_t. But once v3 directories are in use,
      clients and caches will no longer need to hold authority opinions;
      thus, the rationale for keeping the types separate is now gone.
    - Make the code used to reschedule and reattempt downloads more
      uniform.
    - Turn all 'Are we a directory server/mirror?' logic into a call to
      dirserver_mode().
    - Remove the code to generate the oldest (v1) directory format.
      The code has been disabled since 0.2.0.5-alpha.


Changes in version 0.2.0.7-alpha - 2007-09-21
  This seventh development snapshot makes bridges work again, makes bridge
  authorities work for the first time, fixes two huge performance flaws
  in hidden services, and fixes a variety of minor issues.

  o New directory authorities:
    - Set up moria1 and tor26 as the first v3 directory authorities. See
      doc/spec/dir-spec.txt for details on the new directory design.

  o Major bugfixes (crashes):
    - Fix possible segfaults in functions called from
      rend_process_relay_cell(). Bugfix on 0.1.2.x.

  o Major bugfixes (bridges):
    - Fix a bug that made servers send a "404 Not found" in response to
      attempts to fetch their server descriptor. This caused Tor servers
      to take many minutes to establish reachability for their DirPort,
      and it totally crippled bridges. Bugfix on 0.2.0.5-alpha.
    - Make "UpdateBridgesFromAuthority" torrc option work: when bridge
      users configure that and specify a bridge with an identity
      fingerprint, now they will lookup the bridge descriptor at the
      default bridge authority via a one-hop tunnel, but once circuits
      are established they will switch to a three-hop tunnel for later
      connections to the bridge authority. Bugfix in 0.2.0.3-alpha.

  o Major bugfixes (hidden services):
    - Hidden services were choosing introduction points uniquely by
      hexdigest, but when constructing the hidden service descriptor
      they merely wrote the (potentially ambiguous) nickname.
    - Clients now use the v2 intro format for hidden service
      connections: they specify their chosen rendezvous point by identity
      digest rather than by (potentially ambiguous) nickname. Both
      are bugfixes on 0.1.2.x, and they could speed up hidden service
      connections dramatically. Thanks to Karsten Loesing.

  o Minor features (security):
    - As a client, do not believe any server that tells us that an
      address maps to an internal address space.
    - Make it possible to enable HashedControlPassword and
      CookieAuthentication at the same time.

  o Minor features (guard nodes):
    - Tag every guard node in our state file with the version that
      we believe added it, or with our own version if we add it. This way,
      if a user temporarily runs an old version of Tor and then switches
      back to a new one, she doesn't automatically lose her guards.

  o Minor features (speed):
    - When implementing AES counter mode, update only the portions of the
      counter buffer that need to change, and don't keep separate
      network-order and host-order counters when they are the same (i.e.,
      on big-endian hosts.)

  o Minor features (controller):
    - Accept LF instead of CRLF on controller, since some software has a
      hard time generating real Internet newlines.
    - Add GETINFO values for the server status events
      "REACHABILITY_SUCCEEDED" and "GOOD_SERVER_DESCRIPTOR". Patch from
      Robert Hogan.

  o Removed features:
     - Routers no longer include bandwidth-history lines in their
       descriptors; this information is already available in extra-info
       documents, and including it in router descriptors took up 60%
       (!) of compressed router descriptor downloads. Completes
       implementation of proposal 104.
     - Remove the contrib scripts ExerciseServer.py, PathDemo.py,
       and TorControl.py, as they use the old v0 controller protocol,
       and are obsoleted by TorFlow anyway.
     - Drop support for v1 rendezvous descriptors, since we never used
       them anyway, and the code has probably rotted by now. Based on
       patch from Karsten Loesing.
     - On OSX, stop warning the user that kqueue support in libevent is
      "experimental", since it seems to have worked fine for ages.

  o Minor bugfixes:
    - When generating information telling us how to extend to a given
      router, do not try to include the nickname if it is absent. Fixes
      bug 467. Bugfix on 0.2.0.3-alpha.
    - Fix a user-triggerable (but not remotely-triggerable) segfault
      in expand_filename(). Bugfix on 0.1.2.x.
    - Fix a memory leak when freeing incomplete requests from DNSPort.
      Found by Niels Provos with valgrind. Bugfix on 0.2.0.1-alpha.
    - Don't try to access (or alter) the state file when running
      --list-fingerprint or --verify-config or --hash-password. (Resolves
      bug 499.) Bugfix on 0.1.2.x.
    - Servers used to decline to publish their DirPort if their
      BandwidthRate, RelayBandwidthRate, or MaxAdvertisedBandwidth
      were below a threshold. Now they only look at BandwidthRate and
      RelayBandwidthRate. Bugfix on 0.1.2.x.
    - Remove an optimization in the AES counter-mode code that assumed
      that the counter never exceeded 2^68. When the counter can be set
      arbitrarily as an IV (as it is by Karsten's new hidden services
      code), this assumption no longer holds. Bugfix on 0.1.2.x.
    - Resume listing "AUTHORITY" flag for authorities in network status.
      Bugfix on 0.2.0.3-alpha; reported by Alex de Joode.

  o Code simplifications and refactoring:
    - Revamp file-writing logic so we don't need to have the entire
      contents of a file in memory at once before we write to disk. Tor,
      meet stdio.
    - Turn "descriptor store" into a full-fledged type.
    - Move all NT services code into a separate source file.
    - Unify all code that computes medians, percentile elements, etc.
    - Get rid of a needless malloc when parsing address policies.


Changes in version 0.1.2.17 - 2007-08-30
  Tor 0.1.2.17 features a new Vidalia version in the Windows and OS
  X bundles. Vidalia 0.0.14 makes authentication required for the
  ControlPort in the default configuration, which addresses important
  security risks. Everybody who uses Vidalia (or another controller)
  should upgrade.

  In addition, this Tor update fixes major load balancing problems with
  path selection, which should speed things up a lot once many people
  have upgraded.

  o Major bugfixes (security):
    - We removed support for the old (v0) control protocol. It has been
      deprecated since Tor 0.1.1.1-alpha, and keeping it secure has
      become more of a headache than it's worth.

  o Major bugfixes (load balancing):
    - When choosing nodes for non-guard positions, weight guards
      proportionally less, since they already have enough load. Patch
      from Mike Perry.
    - Raise the "max believable bandwidth" from 1.5MB/s to 10MB/s. This
      will allow fast Tor servers to get more attention.
    - When we're upgrading from an old Tor version, forget our current
      guards and pick new ones according to the new weightings. These
      three load balancing patches could raise effective network capacity
      by a factor of four. Thanks to Mike Perry for measurements.

  o Major bugfixes (stream expiration):
    - Expire not-yet-successful application streams in all cases if
      they've been around longer than SocksTimeout. Right now there are
      some cases where the stream will live forever, demanding a new
      circuit every 15 seconds. Fixes bug 454; reported by lodger.

  o Minor features (controller):
    - Add a PROTOCOLINFO controller command. Like AUTHENTICATE, it
      is valid before any authentication has been received. It tells
      a controller what kind of authentication is expected, and what
      protocol is spoken. Implements proposal 119.

  o Minor bugfixes (performance):
    - Save on most routerlist_assert_ok() calls in routerlist.c, thus
      greatly speeding up loading cached-routers from disk on startup.
    - Disable sentinel-based debugging for buffer code: we squashed all
      the bugs that this was supposed to detect a long time ago, and now
      its only effect is to change our buffer sizes from nice powers of
      two (which platform mallocs tend to like) to values slightly over
      powers of two (which make some platform mallocs sad).

  o Minor bugfixes (misc):
    - If exit bandwidth ever exceeds one third of total bandwidth, then
      use the correct formula to weight exit nodes when choosing paths.
      Based on patch from Mike Perry.
    - Choose perfectly fairly among routers when choosing by bandwidth and
      weighting by fraction of bandwidth provided by exits. Previously, we
      would choose with only approximate fairness, and correct ourselves
      if we ran off the end of the list.
    - If we require CookieAuthentication but we fail to write the
      cookie file, we would warn but not exit, and end up in a state
      where no controller could authenticate. Now we exit.
    - If we require CookieAuthentication, stop generating a new cookie
      every time we change any piece of our config.
    - Refuse to start with certain directory authority keys, and
      encourage people using them to stop.
    - Terminate multi-line control events properly. Original patch
      from tup.
    - Fix a minor memory leak when we fail to find enough suitable
      servers to choose a circuit.
    - Stop leaking part of the descriptor when we run into a particularly
      unparseable piece of it.


Changes in version 0.2.0.6-alpha - 2007-08-26
  This sixth development snapshot features a new Vidalia version in the
  Windows and OS X bundles. Vidalia 0.0.14 makes authentication required for
  the ControlPort in the default configuration, which addresses important
  security risks.

  In addition, this snapshot fixes major load balancing problems
  with path selection, which should speed things up a lot once many
  people have upgraded. The directory authorities also use a new
  mean-time-between-failure approach to tracking which servers are stable,
  rather than just looking at the most recent uptime.

  o New directory authorities:
    - Set up Tonga as the default bridge directory authority.

  o Major features:
    - Directory authorities now track servers by weighted
      mean-times-between-failures. When we have 4 or more days of data,
      use measured MTBF rather than declared uptime to decide whether
      to call a router Stable. Implements proposal 108.

  o Major bugfixes (load balancing):
    - When choosing nodes for non-guard positions, weight guards
      proportionally less, since they already have enough load. Patch
      from Mike Perry.
    - Raise the "max believable bandwidth" from 1.5MB/s to 10MB/s. This
      will allow fast Tor servers to get more attention.
    - When we're upgrading from an old Tor version, forget our current
      guards and pick new ones according to the new weightings. These
      three load balancing patches could raise effective network capacity
      by a factor of four. Thanks to Mike Perry for measurements.

  o Major bugfixes (descriptor parsing):
    - Handle unexpected whitespace better in malformed descriptors. Bug
      found using Benedikt Boss's new Tor fuzzer! Bugfix on 0.2.0.x.

  o Minor features:
    - There is now an ugly, temporary "desc/all-recent-extrainfo-hack"
      GETINFO for Torstat to use until it can switch to using extrainfos.
    - Optionally (if built with -DEXPORTMALLINFO) export the output
      of mallinfo via http, as tor/mallinfo.txt. Only accessible
      from localhost.

  o Minor bugfixes:
    - Do not intermix bridge routers with controller-added
      routers. (Bugfix on 0.2.0.x)
    - Do not fail with an assert when accept() returns an unexpected
      address family. Addresses but does not wholly fix bug 483. (Bugfix
      on 0.2.0.x)
    - Let directory authorities startup even when they can't generate
      a descriptor immediately, e.g. because they don't know their
      address.
    - Stop putting the authentication cookie in a file called "0"
      in your working directory if you don't specify anything for the
      new CookieAuthFile option. Reported by Matt Edman.
    - Make it possible to read the PROTOCOLINFO response in a way that
      conforms to our control-spec. Reported by Matt Edman.
    - Fix a minor memory leak when we fail to find enough suitable
      servers to choose a circuit. Bugfix on 0.1.2.x.
    - Stop leaking part of the descriptor when we run into a particularly
      unparseable piece of it. Bugfix on 0.1.2.x.
    - Unmap the extrainfo cache file on exit.


Changes in version 0.2.0.5-alpha - 2007-08-19
  This fifth development snapshot fixes compilation on Windows again;
  fixes an obnoxious client-side bug that slowed things down and put
  extra load on the network; gets us closer to using the v3 directory
  voting scheme; makes it easier for Tor controllers to use cookie-based
  authentication; and fixes a variety of other bugs.

  o Removed features:
    - Version 1 directories are no longer generated in full. Instead,
      authorities generate and serve "stub" v1 directories that list
      no servers. This will stop Tor versions 0.1.0.x and earlier from
      working, but (for security reasons) nobody should be running those
      versions anyway.

  o Major bugfixes (compilation, 0.2.0.x):
    - Try to fix Win32 compilation again: improve checking for IPv6 types.
    - Try to fix MSVC compilation: build correctly on platforms that do
      not define s6_addr16 or s6_addr32.
    - Fix compile on platforms without getaddrinfo: bug found by Li-Hui
      Zhou.

  o Major bugfixes (stream expiration):
    - Expire not-yet-successful application streams in all cases if
      they've been around longer than SocksTimeout. Right now there are
      some cases where the stream will live forever, demanding a new
      circuit every 15 seconds. Bugfix on 0.1.2.7-alpha; fixes bug 454;
      reported by lodger.

  o Minor features (directory servers):
    - When somebody requests a list of statuses or servers, and we have
      none of those, return a 404 rather than an empty 200.

  o Minor features (directory voting):
    - Store v3 consensus status consensuses on disk, and reload them
      on startup.

  o Minor features (security):
    - Warn about unsafe ControlPort configurations.
    - Refuse to start with certain directory authority keys, and
      encourage people using them to stop.

  o Minor features (controller):
    - Add a PROTOCOLINFO controller command. Like AUTHENTICATE, it
      is valid before any authentication has been received. It tells
      a controller what kind of authentication is expected, and what
      protocol is spoken. Implements proposal 119.
    - New config option CookieAuthFile to choose a new location for the
      cookie authentication file, and config option
      CookieAuthFileGroupReadable to make it group-readable.

  o Minor features (unit testing):
    - Add command-line arguments to unit-test executable so that we can
      invoke any chosen test from the command line rather than having
      to run the whole test suite at once; and so that we can turn on
      logging for the unit tests.

  o Minor bugfixes (on 0.1.2.x):
    - If we require CookieAuthentication but we fail to write the
      cookie file, we would warn but not exit, and end up in a state
      where no controller could authenticate. Now we exit.
    - If we require CookieAuthentication, stop generating a new cookie
      every time we change any piece of our config.
    - When loading bandwidth history, do not believe any information in
      the future.  Fixes bug 434.
    - When loading entry guard information, do not believe any information
      in the future.
    - When we have our clock set far in the future and generate an
      onion key, then re-set our clock to be correct, we should not stop
      the onion key from getting rotated.
    - Clean up torrc sample config file.
    - Do not automatically run configure from autogen.sh. This
      non-standard behavior tended to annoy people who have built other
      programs.

  o Minor bugfixes (on 0.2.0.x):
    - Fix a bug with AutomapHostsOnResolve that would always cause
      the second request to fail. Bug reported by Kate. Bugfix on
      0.2.0.3-alpha.
    - Fix a bug in ADDRMAP controller replies that would sometimes
      try to print a NULL. Patch from tup.
    - Read v3 directory authority keys from the right location.
    - Numerous bugfixes to directory voting code.


Changes in version 0.1.2.16 - 2007-08-01
  Tor 0.1.2.16 fixes a critical security vulnerability that allows a
  remote attacker in certain situations to rewrite the user's torrc
  configuration file. This can completely compromise anonymity of users
  in most configurations, including those running the Vidalia bundles,
  TorK, etc. Or worse.

  o Major security fixes:
    - Close immediately after missing authentication on control port;
      do not allow multiple authentication attempts.


Changes in version 0.2.0.4-alpha - 2007-08-01
  This fourth development snapshot fixes a critical security vulnerability
  for most users, specifically those running Vidalia, TorK, etc. Everybody
  should upgrade to either 0.1.2.16 or 0.2.0.4-alpha.

  o Major security fixes:
    - Close immediately after missing authentication on control port;
      do not allow multiple authentication attempts.

  o Major bugfixes (compilation):
    - Fix win32 compilation: apparently IN_ADDR and IN6_ADDR are already
      defined there.

  o Minor features (performance):
    - Be even more aggressive about releasing RAM from small
      empty buffers. Thanks to our free-list code, this shouldn't be too
      performance-intensive.
    - Disable sentinel-based debugging for buffer code: we squashed all
      the bugs that this was supposed to detect a long time ago, and
      now its only effect is to change our buffer sizes from nice
      powers of two (which platform mallocs tend to like) to values
      slightly over powers of two (which make some platform mallocs sad).
    - Log malloc statistics from mallinfo() on platforms where it
      exists.


Changes in version 0.2.0.3-alpha - 2007-07-29
  This third development snapshot introduces new experimental
  blocking-resistance features and a preliminary version of the v3
  directory voting design, and includes many other smaller features
  and bugfixes.

  o Major features:
    - The first pieces of our "bridge" design for blocking-resistance
      are implemented. People can run bridge directory authorities;
      people can run bridges; and people can configure their Tor clients
      with a set of bridges to use as the first hop into the Tor network.
      See http://archives.seul.org/or/talk/Jul-2007/msg00249.html for
      details.
    - Create listener connections before we setuid to the configured
      User and Group. Now non-Windows users can choose port values
      under 1024, start Tor as root, and have Tor bind those ports
      before it changes to another UID. (Windows users could already
      pick these ports.)
    - Added a new ConstrainedSockets config option to set SO_SNDBUF and
      SO_RCVBUF on TCP sockets. Hopefully useful for Tor servers running
      on "vserver" accounts. (Patch from coderman.)
    - Be even more aggressive about separating local traffic from relayed
      traffic when RelayBandwidthRate is set. (Refines proposal 111.)

  o Major features (experimental):
    - First cut of code for "v3 dir voting": directory authorities will
      vote on a common network status document rather than each publishing
      their own opinion. This code needs more testing and more corner-case
      handling before it's ready for use.

  o Security fixes:
    - Directory authorities now call routers Fast if their bandwidth is
      at least 100KB/s, and consider their bandwidth adequate to be a
      Guard if it is at least 250KB/s, no matter the medians. This fix
      complements proposal 107. [Bugfix on 0.1.2.x]
    - Directory authorities now never mark more than 3 servers per IP as
      Valid and Running. (Implements proposal 109, by Kevin Bauer and
      Damon McCoy.)
    - Minor change to organizationName and commonName generation
      procedures in TLS certificates during Tor handshakes, to invalidate
      some earlier censorware approaches. This is not a long-term
      solution, but applying it will give us a bit of time to look into
      the epidemiology of countermeasures as they spread.

  o Major bugfixes (directory):
    - Rewrite directory tokenization code to never run off the end of
      a string. Fixes bug 455. Patch from croup. [Bugfix on 0.1.2.x]

  o Minor features (controller):
    - Add a SOURCE_ADDR field to STREAM NEW events so that controllers can
      match requests to applications. (Patch from Robert Hogan.)
    - Report address and port correctly on connections to DNSPort. (Patch
      from Robert Hogan.)
    - Add a RESOLVE command to launch hostname lookups. (Original patch
      from Robert Hogan.)
    - Add GETINFO status/enough-dir-info to let controllers tell whether
      Tor has downloaded sufficient directory information. (Patch
      from Tup.)
    - You can now use the ControlSocket option to tell Tor to listen for
      controller connections on Unix domain sockets on systems that
      support them. (Patch from Peter Palfrader.)
    - STREAM NEW events are generated for DNSPort requests and for
      tunneled directory connections. (Patch from Robert Hogan.)
    - New "GETINFO address-mappings/*" command to get address mappings
      with expiry information. "addr-mappings/*" is now deprecated.
      (Patch from Tup.)

  o Minor features (misc):
    - Merge in some (as-yet-unused) IPv6 address manipulation code. (Patch
      from croup.)
    - The tor-gencert tool for v3 directory authorities now creates all
      files as readable to the file creator only, and write-protects
      the authority identity key.
    - When dumping memory usage, list bytes used in buffer memory
      free-lists.
    - When running with dmalloc, dump more stats on hup and on exit.
    - Directory authorities now fail quickly and (relatively) harmlessly
      if they generate a network status document that is somehow
      malformed.

  o Traffic load balancing improvements:
    - If exit bandwidth ever exceeds one third of total bandwidth, then
      use the correct formula to weight exit nodes when choosing paths.
      (Based on patch from Mike Perry.)
    - Choose perfectly fairly among routers when choosing by bandwidth and
      weighting by fraction of bandwidth provided by exits. Previously, we
      would choose with only approximate fairness, and correct ourselves
      if we ran off the end of the list. [Bugfix on 0.1.2.x]

  o Performance improvements:
    - Be more aggressive with freeing buffer RAM or putting it on the
      memory free lists.
    - Use Critical Sections rather than Mutexes for synchronizing threads
      on win32; Mutexes are heavier-weight, and designed for synchronizing
      between processes.

  o Deprecated and removed features:
    - RedirectExits is now deprecated.
    - Stop allowing address masks that do not correspond to bit prefixes.
      We have warned about these for a really long time; now it's time
      to reject them. (Patch from croup.)

  o Minor bugfixes (directory):
    - Fix another crash bug related to extra-info caching. (Bug found by
      Peter Palfrader.) [Bugfix on 0.2.0.2-alpha]
    - Directories no longer return a "304 not modified" when they don't
      have the networkstatus the client asked for. Also fix a memory
      leak when returning 304 not modified. [Bugfixes on 0.2.0.2-alpha]
    - We had accidentally labelled 0.1.2.x directory servers as not
      suitable for begin_dir requests, and had labelled no directory
      servers as suitable for uploading extra-info documents. [Bugfix
      on 0.2.0.1-alpha]

  o Minor bugfixes (dns):
    - Fix a crash when DNSPort is set more than once. (Patch from Robert
      Hogan.) [Bugfix on 0.2.0.2-alpha]
    - Add DNSPort connections to the global connection list, so that we
      can time them out correctly. (Bug found by Robert Hogan.) [Bugfix
      on 0.2.0.2-alpha]
    - Fix a dangling reference that could lead to a crash when DNSPort is
      changed or closed (Patch from Robert Hogan.) [Bugfix on
      0.2.0.2-alpha]

  o Minor bugfixes (controller):
    - Provide DNS expiry times in GMT, not in local time. For backward
      compatibility, ADDRMAP events only provide GMT expiry in an extended
      field. "GETINFO address-mappings" always does the right thing.
    - Use CRLF line endings properly in NS events.
    - Terminate multi-line control events properly. (Original patch
      from tup.) [Bugfix on 0.1.2.x-alpha]
    - Do not include spaces in SOURCE_ADDR fields in STREAM
      events. Resolves bug 472. [Bugfix on 0.2.0.x-alpha]


Changes in version 0.1.2.15 - 2007-07-17
  Tor 0.1.2.15 fixes several crash bugs, fixes some anonymity-related
  problems, fixes compilation on BSD, and fixes a variety of other
  bugs. Everybody should upgrade.

  o Major bugfixes (compilation):
    - Fix compile on FreeBSD/NetBSD/OpenBSD. Oops.

  o Major bugfixes (crashes):
    - Try even harder not to dereference the first character after
      an mmap(). Reported by lodger.
    - Fix a crash bug in directory authorities when we re-number the
      routerlist while inserting a new router.
    - When the cached-routers file is an even multiple of the page size,
      don't run off the end and crash. (Fixes bug 455; based on idea
      from croup.)
    - Fix eventdns.c behavior on Solaris: It is critical to include
      orconfig.h _before_ sys/types.h, so that we can get the expected
      definition of _FILE_OFFSET_BITS.

  o Major bugfixes (security):
    - Fix a possible buffer overrun when using BSD natd support. Bug
      found by croup.
    - When sending destroy cells from a circuit's origin, don't include
      the reason for tearing down the circuit. The spec says we didn't,
      and now we actually don't. Reported by lodger.
    - Keep streamids from different exits on a circuit separate. This
      bug may have allowed other routers on a given circuit to inject
      cells into streams. Reported by lodger; fixes bug 446.
    - If there's a never-before-connected-to guard node in our list,
      never choose any guards past it. This way we don't expand our
      guard list unless we need to.

  o Minor bugfixes (guard nodes):
    - Weight guard selection by bandwidth, so that low-bandwidth nodes
      don't get overused as guards.

  o Minor bugfixes (directory):
    - Correctly count the number of authorities that recommend each
      version. Previously, we were under-counting by 1.
    - Fix a potential crash bug when we load many server descriptors at
      once and some of them make others of them obsolete. Fixes bug 458.

  o Minor bugfixes (hidden services):
    - Stop tearing down the whole circuit when the user asks for a
      connection to a port that the hidden service didn't configure.
      Resolves bug 444.

  o Minor bugfixes (misc):
    - On Windows, we were preventing other processes from reading
      cached-routers while Tor was running. Reported by janbar.
    - Fix a possible (but very unlikely) bug in picking routers by
      bandwidth. Add a log message to confirm that it is in fact
      unlikely. Patch from lodger.
    - Backport a couple of memory leak fixes.
    - Backport miscellaneous cosmetic bugfixes.


Changes in version 0.2.0.2-alpha - 2007-06-02
  o Major bugfixes on 0.2.0.1-alpha:
    - Fix an assertion failure related to servers without extra-info digests.
      Resolves bugs 441 and 442.

  o Minor features (directory):
    - Support "If-Modified-Since" when answering HTTP requests for
      directories, running-routers documents, and network-status documents.
      (There's no need to support it for router descriptors, since those
      are downloaded by descriptor digest.)

  o Minor build issues:
    - Clear up some MIPSPro compiler warnings.
    - When building from a tarball on a machine that happens to have SVK
      installed, report the micro-revision as whatever version existed
      in the tarball, not as "x".


Changes in version 0.2.0.1-alpha - 2007-06-01
  This early development snapshot provides new features for people running
  Tor as both a client and a server (check out the new RelayBandwidth
  config options); lets Tor run as a DNS proxy; and generally moves us
  forward on a lot of fronts.

  o Major features, server usability:
    - New config options RelayBandwidthRate and RelayBandwidthBurst:
      a separate set of token buckets for relayed traffic. Right now
      relayed traffic is defined as answers to directory requests, and
      OR connections that don't have any local circuits on them.

  o Major features, client usability:
    - A client-side DNS proxy feature to replace the need for
      dns-proxy-tor: Just set "DNSPort 9999", and Tor will now listen
      for DNS requests on port 9999, use the Tor network to resolve them
      anonymously, and send the reply back like a regular DNS server.
      The code still only implements a subset of DNS.
    - Make PreferTunneledDirConns and TunnelDirConns work even when
      we have no cached directory info. This means Tor clients can now
      do all of their connections protected by TLS.

  o Major features, performance and efficiency:
    - Directory authorities accept and serve "extra info" documents for
      routers. These documents contain fields from router descriptors
      that aren't usually needed, and that use a lot of excess
      bandwidth. Once these fields are removed from router descriptors,
      the bandwidth savings should be about 60%. [Partially implements
      proposal 104.]
    - Servers upload extra-info documents to any authority that accepts
      them. Authorities (and caches that have been configured to download
      extra-info documents) download them as needed. [Partially implements
      proposal 104.]
    - Change the way that Tor buffers data that it is waiting to write.
      Instead of queueing data cells in an enormous ring buffer for each
      client->OR or OR->OR connection, we now queue cells on a separate
      queue for each circuit.  This lets us use less slack memory, and
      will eventually let us be smarter about prioritizing different kinds
      of traffic.
    - Use memory pools to allocate cells with better speed and memory
      efficiency, especially on platforms where malloc() is inefficient.
    - Stop reading on edge connections when their corresponding circuit
      buffers are full; start again as the circuits empty out.

  o Major features, other:
    - Add an HSAuthorityRecordStats option that hidden service authorities
      can use to track statistics of overall hidden service usage without
      logging information that would be very useful to an attacker.
    - Start work implementing multi-level keys for directory authorities:
      Add a standalone tool to generate key certificates. (Proposal 103.)

  o Security fixes:
    - Directory authorities now call routers Stable if they have an
      uptime of at least 30 days, even if that's not the median uptime
      in the network. Implements proposal 107, suggested by Kevin Bauer
      and Damon McCoy.

  o Minor fixes (resource management):
    - Count the number of open sockets separately from the number
      of active connection_t objects. This will let us avoid underusing
      our allocated connection limit.
    - We no longer use socket pairs to link an edge connection to an
      anonymous directory connection or a DirPort test connection.
      Instead, we track the link internally and transfer the data
      in-process. This saves two sockets per "linked" connection (at the
      client and at the server), and avoids the nasty Windows socketpair()
      workaround.
    - Keep unused 4k and 16k buffers on free lists, rather than wasting 8k
      for every single inactive connection_t. Free items from the
      4k/16k-buffer free lists when they haven't been used for a while.

  o Minor features (build):
    - Make autoconf search for libevent, openssl, and zlib consistently.
    - Update deprecated macros in configure.in.
    - When warning about missing headers, tell the user to let us
      know if the compile succeeds anyway, so we can downgrade the
      warning.
    - Include the current subversion revision as part of the version
      string: either fetch it directly if we're in an SVN checkout, do
      some magic to guess it if we're in an SVK checkout, or use
      the last-detected version if we're building from a .tar.gz.
      Use this version consistently in log messages.

  o Minor features (logging):
    - Always prepend "Bug: " to any log message about a bug.
    - Put a platform string (e.g. "Linux i686") in the startup log
      message, so when people paste just their logs, we know if it's
      OpenBSD or Windows or what.
    - When logging memory usage, break down memory used in buffers by
      buffer type.

  o Minor features (directory system):
    - New config option V2AuthoritativeDirectory that all directory
      authorities should set. This will let future authorities choose
      not to serve V2 directory information.
    - Directory authorities allow multiple router descriptors and/or extra
      info documents to be uploaded in a single go.  This will make
      implementing proposal 104 simpler.

  o Minor features (controller):
    - Add a new config option __DisablePredictedCircuits designed for
      use by the controller, when we don't want Tor to build any circuits
      preemptively.
    - Let the controller specify HOP=%d as an argument to ATTACHSTREAM,
      so we can exit from the middle of the circuit.
    - Implement "getinfo status/circuit-established".
    - Implement "getinfo status/version/..." so a controller can tell
      whether the current version is recommended, and whether any versions
      are good, and how many authorities agree. (Patch from shibz.)

  o Minor features (hidden services):
    - Allow multiple HiddenServicePort directives with the same virtual
      port; when they occur, the user is sent round-robin to one
      of the target ports chosen at random.  Partially fixes bug 393 by
      adding limited ad-hoc round-robining.

  o Minor features (other):
    - More unit tests.
    - Add a new AutomapHostsOnResolve option: when it is enabled, any
      resolve request for hosts matching a given pattern causes Tor to
      generate an internal virtual address mapping for that host.  This
      allows DNSPort to work sensibly with hidden service users.  By
      default, .exit and .onion addresses are remapped; the list of
      patterns can be reconfigured with AutomapHostsSuffixes.
    - Add an "-F" option to tor-resolve to force a resolve for a .onion
      address. Thanks to the AutomapHostsOnResolve option, this is no
      longer a completely silly thing to do.
    - If Tor is invoked from something that isn't a shell (e.g. Vidalia),
      now we expand "-f ~/.tor/torrc" correctly. Suggested by Matt Edman.
    - Treat "2gb" when given in torrc for a bandwidth as meaning 2gb,
      minus 1 byte: the actual maximum declared bandwidth.

  o Removed features:
    - Removed support for the old binary "version 0" controller protocol.
      This has been deprecated since 0.1.1, and warnings have been issued
      since 0.1.2.  When we encounter a v0 control message, we now send
      back an error and close the connection.
    - Remove the old "dns worker" server DNS code: it hasn't been default
      since 0.1.2.2-alpha, and all the servers seem to be using the new
      eventdns code.

  o Minor bugfixes (portability):
    - Even though Windows is equally happy with / and \ as path separators,
      try to use \ consistently on Windows and / consistently on Unix: it
      makes the log messages nicer.
    - Correctly report platform name on Windows 95 OSR2 and Windows 98 SE.
    - Read resolv.conf files correctly on platforms where read() returns
      partial results on small file reads.

  o Minor bugfixes (directory):
    - Correctly enforce that elements of directory objects do not appear
      more often than they are allowed to appear.
    - When we are reporting the DirServer line we just parsed, we were
      logging the second stanza of the key fingerprint, not the first.

  o Minor bugfixes (logging):
    - When we hit an EOF on a log (probably because we're shutting down),
      don't try to remove the log from the list: just mark it as
      unusable.  (Bulletproofs against bug 222.)

  o Minor bugfixes (other):
    - In the exitlist script, only consider the most recently published
      server descriptor for each server. Also, when the user requests
      a list of servers that _reject_ connections to a given address,
      explicitly exclude the IPs that also have servers that accept
      connections to that address. (Resolves bug 405.)
    - Stop allowing hibernating servers to be "stable" or "fast".
    - On Windows, we were preventing other processes from reading
      cached-routers while Tor was running.  (Reported by janbar)
    - Make the NodeFamilies config option work. (Reported by
      lodger -- it has never actually worked, even though we added it
      in Oct 2004.)
    - Check return values from pthread_mutex functions.
    - Don't save non-general-purpose router descriptors to the disk cache,
      because we have no way of remembering what their purpose was when
      we restart.
    - Add even more asserts to hunt down bug 417.
    - Build without verbose warnings even on (not-yet-released) gcc 4.2.
    - Fix a possible (but very unlikely) bug in picking routers by bandwidth.
      Add a log message to confirm that it is in fact unlikely.

  o Minor bugfixes (controller):
    - Make 'getinfo fingerprint' return a 551 error if we're not a
      server, so we match what the control spec claims we do. Reported
      by daejees.
    - Fix a typo in an error message when extendcircuit fails that
      caused us to not follow the \r\n-based delimiter protocol. Reported
      by daejees.

  o Code simplifications and refactoring:
    - Stop passing around circuit_t and crypt_path_t pointers that are
      implicit in other procedure arguments.
    - Drop the old code to choke directory connections when the
      corresponding OR connections got full: thanks to the cell queue
      feature, OR conns don't get full any more.
    - Make dns_resolve() handle attaching connections to circuits
      properly, so the caller doesn't have to.
    - Rename wants_to_read and wants_to_write to read/write_blocked_on_bw.
    - Keep the connection array as a dynamic smartlist_t, rather than as
      a fixed-sized array. This is important, as the number of connections
      is becoming increasingly decoupled from the number of sockets.


Changes in version 0.1.2.14 - 2007-05-25
  Tor 0.1.2.14 changes the addresses of two directory authorities (this
  change especially affects those who serve or use hidden services),
  and fixes several other crash- and security-related bugs.

  o Directory authority changes:
    - Two directory authorities (moria1 and moria2) just moved to new
      IP addresses. This change will particularly affect those who serve
      or use hidden services.

  o Major bugfixes (crashes):
    - If a directory server runs out of space in the connection table
      as it's processing a begin_dir request, it will free the exit stream
      but leave it attached to the circuit, leading to unpredictable
      behavior. (Reported by seeess, fixes bug 425.)
    - Fix a bug in dirserv_remove_invalid() that would cause authorities
      to corrupt memory under some really unlikely scenarios.
    - Tighten router parsing rules. (Bugs reported by Benedikt Boss.)
    - Avoid segfaults when reading from mmaped descriptor file. (Reported
      by lodger.)

  o Major bugfixes (security):
    - When choosing an entry guard for a circuit, avoid using guards
      that are in the same family as the chosen exit -- not just guards
      that are exactly the chosen exit. (Reported by lodger.)

  o Major bugfixes (resource management):
    - If a directory authority is down, skip it when deciding where to get
      networkstatus objects or descriptors. Otherwise we keep asking
      every 10 seconds forever. Fixes bug 384.
    - Count it as a failure if we fetch a valid network-status but we
      don't want to keep it. Otherwise we'll keep fetching it and keep
      not wanting to keep it. Fixes part of bug 422.
    - If all of our dirservers have given us bad or no networkstatuses
      lately, then stop hammering them once per minute even when we
      think they're failed. Fixes another part of bug 422.

  o Minor bugfixes:
    - Actually set the purpose correctly for descriptors inserted with
      purpose=controller.
    - When we have k non-v2 authorities in our DirServer config,
      we ignored the last k authorities in the list when updating our
      network-statuses.
    - Correctly back-off from requesting router descriptors that we are
      having a hard time downloading.
    - Read resolv.conf files correctly on platforms where read() returns
      partial results on small file reads.
    - Don't rebuild the entire router store every time we get 32K of
      routers: rebuild it when the journal gets very large, or when
      the gaps in the store get very large.

  o Minor features:
    - When routers publish SVN revisions in their router descriptors,
      authorities now include those versions correctly in networkstatus
      documents.
    - Warn when using a version of libevent before 1.3b to run a server on
      OSX or BSD: these versions interact badly with userspace threads.


Changes in version 0.1.2.13 - 2007-04-24
  This release features some major anonymity fixes, such as safer path
  selection; better client performance; faster bootstrapping, better
  address detection, and better DNS support for servers; write limiting as
  well as read limiting to make servers easier to run; and a huge pile of
  other features and bug fixes. The bundles also ship with Vidalia 0.0.11.

  Tor 0.1.2.13 is released in memory of Rob Levin (1955-2006), aka lilo
  of the Freenode IRC network, remembering his patience and vision for
  free speech on the Internet.

  o Minor fixes:
    - Fix a memory leak when we ask for "all" networkstatuses and we
      get one we don't recognize.
    - Add more asserts to hunt down bug 417.
    - Disable kqueue on OS X 10.3 and earlier, to fix bug 371.


Changes in version 0.1.2.12-rc - 2007-03-16
  o Major bugfixes:
    - Fix an infinite loop introduced in 0.1.2.7-alpha when we serve
      directory information requested inside Tor connections (i.e. via
      begin_dir cells). It only triggered when the same connection was
      serving other data at the same time. Reported by seeess.

  o Minor bugfixes:
    - When creating a circuit via the controller, send a 'launched'
      event when we're done, so we follow the spec better.


Changes in version 0.1.2.11-rc - 2007-03-15
  o Minor bugfixes (controller), reported by daejees:
    - Correct the control spec to match how the code actually responds
      to 'getinfo addr-mappings/*'.
    - The control spec described a GUARDS event, but the code
      implemented a GUARD event. Standardize on GUARD, but let people
      ask for GUARDS too.


Changes in version 0.1.2.10-rc - 2007-03-07
  o Major bugfixes (Windows):
    - Do not load the NT services library functions (which may not exist)
      just to detect if we're a service trying to shut down. Now we run
      on Win98 and friends again.

  o Minor bugfixes (other):
    - Clarify a couple of log messages.
    - Fix a misleading socks5 error number.


Changes in version 0.1.2.9-rc - 2007-03-02
  o Major bugfixes (Windows):
    - On MinGW, use "%I64u" to printf/scanf 64-bit integers, instead
      of the usual GCC "%llu". This prevents a bug when saving 64-bit
      int configuration values: the high-order 32 bits would get
      truncated. In particular, we were being bitten by the default
      MaxAdvertisedBandwidth of 128 TB turning into 0. (Fixes bug 400
      and maybe also bug 397.)

  o Minor bugfixes (performance):
    - Use OpenSSL's AES implementation on platforms where it's faster.
      This could save us as much as 10% CPU usage.

  o Minor bugfixes (server):
    - Do not rotate onion key immediately after setting it for the first
      time.

  o Minor bugfixes (directory authorities):
    - Stop calling servers that have been hibernating for a long time
      "stable". Also, stop letting hibernating or obsolete servers affect
      uptime and bandwidth cutoffs.
    - Stop listing hibernating servers in the v1 directory.

  o Minor bugfixes (hidden services):
    - Upload hidden service descriptors slightly less often, to reduce
      load on authorities.

  o Minor bugfixes (other):
    - Fix an assert that could trigger if a controller quickly set then
      cleared EntryNodes.  (Bug found by Udo van den Heuvel.)
    - On architectures where sizeof(int)>4, still clamp declarable bandwidth
      to INT32_MAX.
    - Fix a potential race condition in the rpm installer.  Found by
      Stefan Nordhausen.
    - Try to fix eventdns warnings once and for all: do not treat a dns rcode
      of 2 as indicating that the server is completely bad; it sometimes
      means that the server is just bad for the request in question. (may fix
      the last of bug 326.)
    - Disable encrypted directory connections when we don't have a server
      descriptor for the destination. We'll get this working again in
      the 0.2.0 branch.


Changes in version 0.1.2.8-beta - 2007-02-26
  o Major bugfixes (crashes):
    - Stop crashing when the controller asks us to resetconf more than
      one config option at once. (Vidalia 0.0.11 does this.)
    - Fix a crash that happened on Win98 when we're given command-line
      arguments: don't try to load NT service functions from advapi32.dll
      except when we need them. (Bug introduced in 0.1.2.7-alpha;
      resolves bug 389.)
    - Fix a longstanding obscure crash bug that could occur when
      we run out of DNS worker processes. (Resolves bug 390.)

  o Major bugfixes (hidden services):
    - Correctly detect whether hidden service descriptor downloads are
      in-progress. (Suggested by Karsten Loesing; fixes bug 399.)

  o Major bugfixes (accounting):
    - When we start during an accounting interval before it's time to wake
      up, remember to wake up at the correct time. (May fix bug 342.)

  o Minor bugfixes (controller):
    - Give the controller END_STREAM_REASON_DESTROY events _before_ we
      clear the corresponding on_circuit variable, and remember later
      that we don't need to send a redundant CLOSED event.  (Resolves part
      3 of bug 367.)
    - Report events where a resolve succeeded or where we got a socks
      protocol error correctly, rather than calling both of them
      "INTERNAL".
    - Change reported stream target addresses to IP consistently when
      we finally get the IP from an exit node.
    - Send log messages to the controller even if they happen to be very
      long.

  o Minor bugfixes (other):
    - Display correct results when reporting which versions are
      recommended, and how recommended they are. (Resolves bug 383.)
    - Improve our estimates for directory bandwidth to be less random:
      guess that an unrecognized directory will have the average bandwidth
      from all known directories, not that it will have the average
      bandwidth from those directories earlier than it on the list.
    - If we start a server with ClientOnly 1, then set ClientOnly to 0
      and hup, stop triggering an assert based on an empty onion_key.
    - On platforms with no working mmap() equivalent, don't warn the
      user when cached-routers doesn't exist.
    - Warn the user when mmap() [or its equivalent] fails for some reason
      other than file-not-found.
    - Don't warn the user when cached-routers.new doesn't exist: that's
      perfectly fine when starting up for the first time.
    - When EntryNodes are configured, rebuild the guard list to contain,
      in order: the EntryNodes that were guards before; the rest of the
      EntryNodes; the nodes that were guards before.
    - Mask out all signals in sub-threads; only the libevent signal
      handler should be processing them. This should prevent some crashes
      on some machines using pthreads. (Patch from coderman.)
    - Fix switched arguments on memset in the implementation of
      tor_munmap() for systems with no mmap() call.
    - When Tor receives a router descriptor that it asked for, but
      no longer wants (because it has received fresh networkstatuses
      in the meantime), do not warn the user.  Cache the descriptor if
      we're a cache; drop it if we aren't.
    - Make earlier entry guards _really_ get retried when the network
      comes back online.
    - On a malformed DNS reply, always give an error to the corresponding
      DNS request.
    - Build with recent libevents on platforms that do not define the
      nonstandard types "u_int8_t" and friends.

  o Minor features (controller):
    - Warn the user when an application uses the obsolete binary v0
      control protocol.  We're planning to remove support for it during
      the next development series, so it's good to give people some
      advance warning.
    - Add STREAM_BW events to report per-entry-stream bandwidth
      use. (Patch from Robert Hogan.)
    - Rate-limit SIGNEWNYM signals in response to controllers that
      impolitely generate them for every single stream. (Patch from
      mwenge; closes bug 394.)
    - Make REMAP stream events have a SOURCE (cache or exit), and
      make them generated in every case where we get a successful
      connected or resolved cell.

  o Minor bugfixes (performance):
    - Call router_have_min_dir_info half as often. (This is showing up in
      some profiles, but not others.)
    - When using GCC, make log_debug never get called at all, and its
      arguments never get evaluated, when no debug logs are configured.
      (This is showing up in some profiles, but not others.)

  o Minor features:
    - Remove some never-implemented options.  Mark PathlenCoinWeight as
      obsolete.
    - Implement proposal 106: Stop requiring clients to have well-formed
      certificates; stop checking nicknames in certificates. (Clients
      have certificates so that they can look like Tor servers, but in
      the future we might want to allow them to look like regular TLS
      clients instead. Nicknames in certificates serve no purpose other
      than making our protocol easier to recognize on the wire.)
    - Revise messages on handshake failure again to be even more clear about
      which are incoming connections and which are outgoing.
    - Discard any v1 directory info that's over 1 month old (for
      directories) or over 1 week old (for running-routers lists).
    - Do not warn when individual nodes in the configuration's EntryNodes,
      ExitNodes, etc are down: warn only when all possible nodes
      are down. (Fixes bug 348.)
    - Always remove expired routers and networkstatus docs before checking
      whether we have enough information to build circuits. (Fixes
      bug 373.)
    - Put a lower-bound on MaxAdvertisedBandwidth.


Changes in version 0.1.2.7-alpha - 2007-02-06
  o Major bugfixes (rate limiting):
    - Servers decline directory requests much more aggressively when
      they're low on bandwidth. Otherwise they end up queueing more and
      more directory responses, which can't be good for latency.
    - But never refuse directory requests from local addresses.
    - Fix a memory leak when sending a 503 response for a networkstatus
      request.
    - Be willing to read or write on local connections (e.g. controller
      connections) even when the global rate limiting buckets are empty.
    - If our system clock jumps back in time, don't publish a negative
      uptime in the descriptor. Also, don't let the global rate limiting
      buckets go absurdly negative.
    - Flush local controller connection buffers periodically as we're
      writing to them, so we avoid queueing 4+ megabytes of data before
      trying to flush.

  o Major bugfixes (NT services):
    - Install as NT_AUTHORITY\LocalService rather than as SYSTEM; add a
      command-line flag so that admins can override the default by saying
      "tor --service install --user "SomeUser"".  This will not affect
      existing installed services.  Also, warn the user that the service
      will look for its configuration file in the service user's
      %appdata% directory.  (We can't do the 'hardwire the user's appdata
      directory' trick any more, since we may not have read access to that
      directory.)

  o Major bugfixes (other):
    - Previously, we would cache up to 16 old networkstatus documents
      indefinitely, if they came from nontrusted authorities. Now we
      discard them if they are more than 10 days old.
    - Fix a crash bug in the presence of DNS hijacking (reported by Andrew
      Del Vecchio).
    - Detect and reject malformed DNS responses containing circular
      pointer loops.
    - If exits are rare enough that we're not marking exits as guards,
      ignore exit bandwidth when we're deciding the required bandwidth
      to become a guard.
    - When we're handling a directory connection tunneled over Tor,
      don't fill up internal memory buffers with all the data we want
      to tunnel; instead, only add it if the OR connection that will
      eventually receive it has some room for it. (This can lead to
      slowdowns in tunneled dir connections; a better solution will have
      to wait for 0.2.0.)

  o Minor bugfixes (dns):
    - Add some defensive programming to eventdns.c in an attempt to catch
      possible memory-stomping bugs.
    - Detect and reject DNS replies containing IPv4 or IPv6 records with
      an incorrect number of bytes. (Previously, we would ignore the
      extra bytes.)
    - Fix as-yet-unused reverse IPv6 lookup code so it sends nybbles
      in the correct order, and doesn't crash.
    - Free memory held in recently-completed DNS lookup attempts on exit.
      This was not a memory leak, but may have been hiding memory leaks.
    - Handle TTL values correctly on reverse DNS lookups.
    - Treat failure to parse resolv.conf as an error.

  o Minor bugfixes (other):
    - Fix crash with "tor --list-fingerprint" (reported by seeess).
    - When computing clock skew from directory HTTP headers, consider what
      time it was when we finished asking for the directory, not what
      time it is now.
    - Expire socks connections if they spend too long waiting for the
      handshake to finish. Previously we would let them sit around for
      days, if the connecting application didn't close them either.
    - And if the socks handshake hasn't started, don't send a
      "DNS resolve socks failed" handshake reply; just close it.
    - Stop using C functions that OpenBSD's linker doesn't like.
    - Don't launch requests for descriptors unless we have networkstatuses
      from at least half of the authorities.  This delays the first
      download slightly under pathological circumstances, but can prevent
      us from downloading a bunch of descriptors we don't need.
    - Do not log IPs with TLS failures for incoming TLS
      connections. (Fixes bug 382.)
    - If the user asks to use invalid exit nodes, be willing to use
      unstable ones.
    - Stop using the reserved ac_cv namespace in our configure script.
    - Call stat() slightly less often; use fstat() when possible.
    - Refactor the way we handle pending circuits when an OR connection
      completes or fails, in an attempt to fix a rare crash bug.
    - Only rewrite a conn's address based on X-Forwarded-For: headers
      if it's a parseable public IP address; and stop adding extra quotes
      to the resulting address.

  o Major features:
    - Weight directory requests by advertised bandwidth. Now we can
      let servers enable write limiting but still allow most clients to
      succeed at their directory requests. (We still ignore weights when
      choosing a directory authority; I hope this is a feature.)

  o Minor features:
    - Create a new file ReleaseNotes which was the old ChangeLog. The
      new ChangeLog file now includes the summaries for all development
      versions too.
    - Check for addresses with invalid characters at the exit as well
      as at the client, and warn less verbosely when they fail. You can
      override this by setting ServerDNSAllowNonRFC953Addresses to 1.
    - Adapt a patch from goodell to let the contrib/exitlist script
      take arguments rather than require direct editing.
    - Inform the server operator when we decide not to advertise a
      DirPort due to AccountingMax enabled or a low BandwidthRate. It
      was confusing Zax, so now we're hopefully more helpful.
    - Bring us one step closer to being able to establish an encrypted
      directory tunnel without knowing a descriptor first. Still not
      ready yet. As part of the change, now assume we can use a
      create_fast cell if we don't know anything about a router.
    - Allow exit nodes to use nameservers running on ports other than 53.
    - Servers now cache reverse DNS replies.
    - Add an --ignore-missing-torrc command-line option so that we can
      get the "use sensible defaults if the configuration file doesn't
      exist" behavior even when specifying a torrc location on the command
      line.

  o Minor features (controller):
    - Track reasons for OR connection failure; make these reasons
      available via the controller interface. (Patch from Mike Perry.)
    - Add a SOCKS_BAD_HOSTNAME client status event so controllers
      can learn when clients are sending malformed hostnames to Tor.
    - Clean up documentation for controller status events.
    - Add a REMAP status to stream events to note that a stream's
      address has changed because of a cached address or a MapAddress
      directive.


Changes in version 0.1.2.6-alpha - 2007-01-09
  o Major bugfixes:
    - Fix an assert error introduced in 0.1.2.5-alpha: if a single TLS
      connection handles more than 4 gigs in either direction, we crash.
    - Fix an assert error introduced in 0.1.2.5-alpha: if we're an
      advertised exit node, somebody might try to exit from us when
      we're bootstrapping and before we've built our descriptor yet.
      Refuse the connection rather than crashing.

  o Minor bugfixes:
    - Warn if we (as a server) find that we've resolved an address that we
      weren't planning to resolve.
    - Warn that using select() on any libevent version before 1.1 will be
      unnecessarily slow (even for select()).
    - Flush ERR-level controller status events just like we currently
      flush ERR-level log events, so that a Tor shutdown doesn't prevent
      the controller from learning about current events.

  o Minor features (more controller status events):
    - Implement EXTERNAL_ADDRESS server status event so controllers can
      learn when our address changes.
    - Implement BAD_SERVER_DESCRIPTOR server status event so controllers
      can learn when directories reject our descriptor.
    - Implement SOCKS_UNKNOWN_PROTOCOL client status event so controllers
      can learn when a client application is speaking a non-socks protocol
      to our SocksPort.
    - Implement DANGEROUS_SOCKS client status event so controllers
      can learn when a client application is leaking DNS addresses.
    - Implement BUG general status event so controllers can learn when
      Tor is unhappy about its internal invariants.
    - Implement CLOCK_SKEW general status event so controllers can learn
      when Tor thinks the system clock is set incorrectly.
    - Implement GOOD_SERVER_DESCRIPTOR and ACCEPTED_SERVER_DESCRIPTOR
      server status events so controllers can learn when their descriptors
      are accepted by a directory.
    - Implement CHECKING_REACHABILITY and REACHABILITY_{SUCCEEDED|FAILED}
      server status events so controllers can learn about Tor's progress in
      deciding whether it's reachable from the outside.
    - Implement BAD_LIBEVENT general status event so controllers can learn
      when we have a version/method combination in libevent that needs to
      be changed.
    - Implement NAMESERVER_STATUS, NAMESERVER_ALL_DOWN, DNS_HIJACKED,
      and DNS_USELESS server status events so controllers can learn
      about changes to DNS server status.

  o Minor features (directory):
    - Authorities no longer recommend exits as guards if this would shift
      too much load to the exit nodes.


Changes in version 0.1.2.5-alpha - 2007-01-06
  o Major features:
    - Enable write limiting as well as read limiting. Now we sacrifice
      capacity if we're pushing out lots of directory traffic, rather
      than overrunning the user's intended bandwidth limits.
    - Include TLS overhead when counting bandwidth usage; previously, we
      would count only the bytes sent over TLS, but not the bytes used
      to send them.
    - Support running the Tor service with a torrc not in the same
      directory as tor.exe and default to using the torrc located in
      the %appdata%\Tor\ of the user who installed the service. Patch
      from Matt Edman.
    - Servers now check for the case when common DNS requests are going to
      wildcarded addresses (i.e. all getting the same answer), and change
      their exit policy to reject *:* if it's happening.
    - Implement BEGIN_DIR cells, so we can connect to the directory
      server via TLS to do encrypted directory requests rather than
      plaintext. Enable via the TunnelDirConns and PreferTunneledDirConns
      config options if you like.

  o Minor features (config and docs):
    - Start using the state file to store bandwidth accounting data:
      the bw_accounting file is now obsolete. We'll keep generating it
      for a while for people who are still using 0.1.2.4-alpha.
    - Try to batch changes to the state file so that we do as few
      disk writes as possible while still storing important things in
      a timely fashion.
    - The state file and the bw_accounting file get saved less often when
      the AvoidDiskWrites config option is set.
    - Make PIDFile work on Windows (untested).
    - Add internal descriptions for a bunch of configuration options:
      accessible via controller interface and in comments in saved
      options files.
    - Reject *:563 (NNTPS) in the default exit policy. We already reject
      NNTP by default, so this seems like a sensible addition.
    - Clients now reject hostnames with invalid characters. This should
      avoid some inadvertent info leaks. Add an option
      AllowNonRFC953Hostnames to disable this behavior, in case somebody
      is running a private network with hosts called @, !, and #.
    - Add a maintainer script to tell us which options are missing
      documentation: "make check-docs".
    - Add a new address-spec.txt document to describe our special-case
      addresses: .exit, .onion, and .noconnnect.

  o Minor features (DNS):
    - Ongoing work on eventdns infrastructure: now it has dns server
      and ipv6 support. One day Tor will make use of it.
    - Add client-side caching for reverse DNS lookups.
    - Add support to tor-resolve tool for reverse lookups and SOCKS5.
    - When we change nameservers or IP addresses, reset and re-launch
      our tests for DNS hijacking.

  o Minor features (directory):
    - Authorities now specify server versions in networkstatus. This adds
      about 2% to the size of compressed networkstatus docs, and allows
      clients to tell which servers support BEGIN_DIR and which don't.
      The implementation is forward-compatible with a proposed future
      protocol version scheme not tied to Tor versions.
    - DirServer configuration lines now have an orport= option so
      clients can open encrypted tunnels to the authorities without
      having downloaded their descriptors yet. Enabled for moria1,
      moria2, tor26, and lefkada now in the default configuration.
    - Directory servers are more willing to send a 503 "busy" if they
      are near their write limit, especially for v1 directory requests.
      Now they can use their limited bandwidth for actual Tor traffic.
    - Clients track responses with status 503 from dirservers. After a
      dirserver has given us a 503, we try not to use it until an hour has
      gone by, or until we have no dirservers that haven't given us a 503.
    - When we get a 503 from a directory, and we're not a server, we don't
      count the failure against the total number of failures allowed
      for the thing we're trying to download.
    - Report X-Your-Address-Is correctly from tunneled directory
      connections; don't report X-Your-Address-Is when it's an internal
      address; and never believe reported remote addresses when they're
      internal.
    - Protect against an unlikely DoS attack on directory servers.
    - Add a BadDirectory flag to network status docs so that authorities
      can (eventually) tell clients about caches they believe to be
      broken.

  o Minor features (controller):
    - Have GETINFO dir/status/* work on hosts with DirPort disabled.
    - Reimplement GETINFO so that info/names stays in sync with the
      actual keys.
    - Implement "GETINFO fingerprint".
    - Implement "SETEVENTS GUARD" so controllers can get updates on
      entry guard status as it changes.

  o Minor features (clean up obsolete pieces):
    - Remove some options that have been deprecated since at least
      0.1.0.x: AccountingMaxKB, LogFile, DebugLogFile, LogLevel, and
      SysLog. Use AccountingMax instead of AccountingMaxKB, and use Log
      to set log options.
    - We no longer look for identity and onion keys in "identity.key" and
      "onion.key" -- these were replaced by secret_id_key and
      secret_onion_key in 0.0.8pre1.
    - We no longer require unrecognized directory entries to be
      preceded by "opt".

  o Major bugfixes (security):
    - Stop sending the HttpProxyAuthenticator string to directory
      servers when directory connections are tunnelled through Tor.
    - Clients no longer store bandwidth history in the state file.
    - Do not log introduction points for hidden services if SafeLogging
      is set.
    - When generating bandwidth history, round down to the nearest
      1k. When storing accounting data, round up to the nearest 1k.
    - When we're running as a server, remember when we last rotated onion
      keys, so that we will rotate keys once they're a week old even if
      we never stay up for a week ourselves.

  o Major bugfixes (other):
    - Fix a longstanding bug in eventdns that prevented the count of
      timed-out resolves from ever being reset. This bug caused us to
      give up on a nameserver the third time it timed out, and try it
      10 seconds later... and to give up on it every time it timed out
      after that.
    - Take out the '5 second' timeout from the connection retry
      schedule. Now the first connect attempt will wait a full 10
      seconds before switching to a new circuit. Perhaps this will help
      a lot. Based on observations from Mike Perry.
    - Fix a bug on the Windows implementation of tor_mmap_file() that
      would prevent the cached-routers file from ever loading. Reported
      by John Kimble.

  o Minor bugfixes:
    - Fix an assert failure when a directory authority sets
      AuthDirRejectUnlisted and then receives a descriptor from an
      unlisted router. Reported by seeess.
    - Avoid a double-free when parsing malformed DirServer lines.
    - Fix a bug when a BSD-style PF socket is first used. Patch from
      Fabian Keil.
    - Fix a bug in 0.1.2.2-alpha that prevented clients from asking
      to resolve an address at a given exit node even when they ask for
      it by name.
    - Servers no longer ever list themselves in their "family" line,
      even if configured to do so. This makes it easier to configure
      family lists conveniently.
    - When running as a server, don't fall back to 127.0.0.1 when no
      nameservers are configured in /etc/resolv.conf; instead, make the
      user fix resolv.conf or specify nameservers explicitly. (Resolves
      bug 363.)
    - Stop accepting certain malformed ports in configured exit policies.
    - Don't re-write the fingerprint file every restart, unless it has
      changed.
    - Stop warning when a single nameserver fails: only warn when _all_ of
      our nameservers have failed. Also, when we only have one nameserver,
      raise the threshold for deciding that the nameserver is dead.
    - Directory authorities now only decide that routers are reachable
      if their identity keys are as expected.
    - When the user uses bad syntax in the Log config line, stop
      suggesting other bad syntax as a replacement.
    - Correctly detect ipv6 DNS capability on OpenBSD.

  o Minor bugfixes (controller):
    - Report the circuit number correctly in STREAM CLOSED events. Bug
      reported by Mike Perry.
    - Do not report bizarre values for results of accounting GETINFOs
      when the last second's write or read exceeds the allotted bandwidth.
    - Report "unrecognized key" rather than an empty string when the
      controller tries to fetch a networkstatus that doesn't exist.


Changes in version 0.1.1.26 - 2006-12-14
  o Security bugfixes:
    - Stop sending the HttpProxyAuthenticator string to directory
      servers when directory connections are tunnelled through Tor.
    - Clients no longer store bandwidth history in the state file.
    - Do not log introduction points for hidden services if SafeLogging
      is set.

  o Minor bugfixes:
    - Fix an assert failure when a directory authority sets
      AuthDirRejectUnlisted and then receives a descriptor from an
      unlisted router (reported by seeess).


Changes in version 0.1.2.4-alpha - 2006-12-03
  o Major features:
    - Add support for using natd; this allows FreeBSDs earlier than
      5.1.2 to have ipfw send connections through Tor without using
      SOCKS. (Patch from Zajcev Evgeny with tweaks from tup.)

  o Minor features:
    - Make all connections to addresses of the form ".noconnect"
      immediately get closed. This lets application/controller combos
      successfully test whether they're talking to the same Tor by
      watching for STREAM events.
    - Make cross.sh cross-compilation script work even when autogen.sh
      hasn't been run. (Patch from Michael Mohr.)
    - Statistics dumped by -USR2 now include a breakdown of public key
      operations, for profiling.

  o Major bugfixes:
    - Fix a major leak when directory authorities parse their
      approved-routers list, a minor memory leak when we fail to pick
      an exit node, and a few rare leaks on errors.
    - Handle TransPort connections even when the server sends data before
      the client sends data. Previously, the connection would just hang
      until the client sent data. (Patch from tup based on patch from
      Zajcev Evgeny.)
    - Avoid assert failure when our cached-routers file is empty on
      startup.

  o Minor bugfixes:
    - Don't log spurious warnings when we see a circuit close reason we
      don't recognize; it's probably just from a newer version of Tor.
    - Have directory authorities allow larger amounts of drift in uptime
      without replacing the server descriptor: previously, a server that
      restarted every 30 minutes could have 48 "interesting" descriptors
      per day.
    - Start linking to the Tor specification and Tor reference manual
      correctly in the Windows installer.
    - Add Vidalia to the OS X uninstaller script, so when we uninstall
      Tor/Privoxy we also uninstall Vidalia.
    - Resume building on Irix64, and fix a lot of warnings from its
      MIPSpro C compiler.
    - Don't corrupt last_guessed_ip in router_new_address_suggestion()
      when we're running as a client.


Changes in version 0.1.1.25 - 2006-11-04
  o Major bugfixes:
    - When a client asks us to resolve (rather than connect to)
      an address, and we have a cached answer, give them the cached
      answer. Previously, we would give them no answer at all.
    - We were building exactly the wrong circuits when we predict
      hidden service requirements, meaning Tor would have to build all
      its circuits on demand.
    - If none of our live entry guards have a high uptime, but we
      require a guard with a high uptime, try adding a new guard before
      we give up on the requirement. This patch should make long-lived
      connections more stable on average.
    - When testing reachability of our DirPort, don't launch new
      tests when there's already one in progress -- unreachable
      servers were stacking up dozens of testing streams.

  o Security bugfixes:
    - When the user sends a NEWNYM signal, clear the client-side DNS
      cache too. Otherwise we continue to act on previous information.

  o Minor bugfixes:
    - Avoid a memory corruption bug when creating a hash table for
      the first time.
    - Avoid possibility of controller-triggered crash when misusing
      certain commands from a v0 controller on platforms that do not
      handle printf("%s",NULL) gracefully.
    - Avoid infinite loop on unexpected controller input.
    - Don't log spurious warnings when we see a circuit close reason we
      don't recognize; it's probably just from a newer version of Tor.
    - Add Vidalia to the OS X uninstaller script, so when we uninstall
      Tor/Privoxy we also uninstall Vidalia.


Changes in version 0.1.2.3-alpha - 2006-10-29
  o Minor features:
    - Prepare for servers to publish descriptors less often: never
      discard a descriptor simply for being too old until either it is
      recommended by no authorities, or until we get a better one for
      the same router. Make caches consider retaining old recommended
      routers for even longer.
    - If most authorities set a BadExit flag for a server, clients
      don't think of it as a general-purpose exit. Clients only consider
      authorities that advertise themselves as listing bad exits.
    - Directory servers now provide 'Pragma: no-cache' and 'Expires'
      headers for content, so that we can work better in the presence of
      caching HTTP proxies.
    - Allow authorities to list nodes as bad exits by fingerprint or by
      address.

  o Minor features, controller:
    - Add a REASON field to CIRC events; for backward compatibility, this
      field is sent only to controllers that have enabled the extended
      event format.  Also, add additional reason codes to explain why
      a given circuit has been destroyed or truncated. (Patches from
      Mike Perry)
    - Add a REMOTE_REASON field to extended CIRC events to tell the
      controller about why a remote OR told us to close a circuit.
    - Stream events also now have REASON and REMOTE_REASON fields,
      working much like those for circuit events.
    - There's now a GETINFO ns/... field so that controllers can ask Tor
      about the current status of a router.
    - A new event type "NS" to inform a controller when our opinion of
      a router's status has changed.
    - Add a GETINFO events/names and GETINFO features/names so controllers
      can tell which events and features are supported.
    - A new CLEARDNSCACHE signal to allow controllers to clear the
      client-side DNS cache without expiring circuits.

  o Security bugfixes:
    - When the user sends a NEWNYM signal, clear the client-side DNS
      cache too. Otherwise we continue to act on previous information.

  o Minor bugfixes:
    - Avoid sending junk to controllers or segfaulting when a controller
      uses EVENT_NEW_DESC with verbose nicknames.
    - Stop triggering asserts if the controller tries to extend hidden
      service circuits (reported by mwenge).
    - Avoid infinite loop on unexpected controller input.
    - When the controller does a "GETINFO network-status", tell it
      about even those routers whose descriptors are very old, and use
      long nicknames where appropriate.
    - Change NT service functions to be loaded on demand.  This lets us
      build with MinGW without breaking Tor for Windows 98 users.
    - Do DirPort reachability tests less often, since a single test
      chews through many circuits before giving up.
    - In the hidden service example in torrc.sample, stop recommending
      esoteric and discouraged hidden service options.
    - When stopping an NT service, wait up to 10 sec for it to actually
      stop.  (Patch from Matt Edman; resolves bug 295.)
    - Fix handling of verbose nicknames with ORCONN controller events:
      make them show up exactly when requested, rather than exactly when
      not requested.
    - When reporting verbose nicknames in entry_guards_getinfo(), avoid
      printing a duplicate "$" in the keys we send (reported by mwenge).
    - Correctly set maximum connection limit on Cygwin. (This time
      for sure!)
    - Try to detect Windows correctly when cross-compiling.
    - Detect the size of the routers file correctly even if it is
      corrupted (on systems without mmap) or not page-aligned (on systems
      with mmap). This bug was harmless.
    - Sometimes we didn't bother sending a RELAY_END cell when an attempt
      to open a stream fails; now we do in more cases. This should
      make clients able to find a good exit faster in some cases, since
      unhandleable requests will now get an error rather than timing out.
    - Resolve two memory leaks when rebuilding the on-disk router cache
      (reported by fookoowa).
    - Clean up minor code warnings suggested by the MIPSpro C compiler,
      and reported by some Centos users.
    - Controller signals now work on non-Unix platforms that don't define
      SIGUSR1 and SIGUSR2 the way we expect.
    - Patch from Michael Mohr to contrib/cross.sh, so it checks more
      values before failing, and always enables eventdns.
    - Libevent-1.2 exports, but does not define in its headers, strlcpy.
      Try to fix this in configure.in by checking for most functions
      before we check for libevent.


Changes in version 0.1.2.2-alpha - 2006-10-07
  o Major features:
    - Make our async eventdns library on-by-default for Tor servers,
      and plan to deprecate the separate dnsworker threads.
    - Add server-side support for "reverse" DNS lookups (using PTR
      records so clients can determine the canonical hostname for a given
      IPv4 address). Only supported by servers using eventdns; servers
      now announce in their descriptors whether they support eventdns.
    - Specify and implement client-side SOCKS5 interface for reverse DNS
      lookups (see doc/socks-extensions.txt).
    - Add a BEGIN_DIR relay cell type for an easier in-protocol way to
      connect to directory servers through Tor. Previously, clients needed
      to find Tor exits to make private connections to directory servers.
    - Avoid choosing Exit nodes for entry or middle hops when the
      total bandwidth available from non-Exit nodes is much higher than
      the total bandwidth available from Exit nodes.
    - Workaround for name servers (like Earthlink's) that hijack failing
      DNS requests and replace the no-such-server answer with a "helpful"
      redirect to an advertising-driven search portal. Also work around
      DNS hijackers who "helpfully" decline to hijack known-invalid
      RFC2606 addresses. Config option "ServerDNSDetectHijacking 0"
      lets you turn it off.
    - Send out a burst of long-range padding cells once we've established
      that we're reachable. Spread them over 4 circuits, so hopefully
      a few will be fast. This exercises our bandwidth and bootstraps
      us into the directory more quickly.

  o New/improved config options:
    - Add new config option "ResolvConf" to let the server operator
      choose an alternate resolve.conf file when using eventdns.
    - Add an "EnforceDistinctSubnets" option to control our "exclude
      servers on the same /16" behavior. It's still on by default; this
      is mostly for people who want to operate private test networks with
      all the machines on the same subnet.
    - If one of our entry guards is on the ExcludeNodes list, or the
      directory authorities don't think it's a good guard, treat it as
      if it were unlisted: stop using it as a guard, and throw it off
      the guards list if it stays that way for a long time.
    - Allow directory authorities to be marked separately as authorities
      for the v1 directory protocol, the v2 directory protocol, and
      as hidden service directories, to make it easier to retire old
      authorities. V1 authorities should set "HSAuthoritativeDir 1"
      to continue being hidden service authorities too.
    - Remove 8888 as a LongLivedPort, and add 6697 (IRCS).

  o Minor features, controller:
    - Fix CIRC controller events so that controllers can learn the
      identity digests of non-Named servers used in circuit paths.
    - Let controllers ask for more useful identifiers for servers. Instead
      of learning identity digests for un-Named servers and nicknames
      for Named servers, the new identifiers include digest, nickname,
      and indication of Named status. Off by default; see control-spec.txt
      for more information.
    - Add a "getinfo address" controller command so it can display Tor's
      best guess to the user.
    - New controller event to alert the controller when our server
      descriptor has changed.
    - Give more meaningful errors on controller authentication failure.

  o Minor features, other:
    - When asked to resolve a hostname, don't use non-exit servers unless
      requested to do so. This allows servers with broken DNS to be
      useful to the network.
    - Divide eventdns log messages into warn and info messages.
    - Reserve the nickname "Unnamed" for routers that can't pick
      a hostname: any router can call itself Unnamed; directory
      authorities will never allocate Unnamed to any particular router;
      clients won't believe that any router is the canonical Unnamed.
    - Only include function names in log messages for info/debug messages.
      For notice/warn/err, the content of the message should be clear on
      its own, and printing the function name only confuses users.
    - Avoid some false positives during reachability testing: don't try
      to test via a server that's on the same /24 as us.
    - If we fail to build a circuit to an intended enclave, and it's
      not mandatory that we use that enclave, stop wanting it.
    - When eventdns is enabled, allow multithreaded builds on NetBSD and
      OpenBSD. (We had previously disabled threads on these platforms
      because they didn't have working thread-safe resolver functions.)

  o Major bugfixes, anonymity/security:
    - If a client asked for a server by name, and there's a named server
      in our network-status but we don't have its descriptor yet, we
      could return an unnamed server instead.
    - Fix NetBSD bug that could allow someone to force uninitialized RAM
      to be sent to a server's DNS resolver. This only affects NetBSD
      and other platforms that do not bounds-check tolower().
    - Reject (most) attempts to use Tor circuits with length one. (If
      many people start using Tor as a one-hop proxy, exit nodes become
      a more attractive target for compromise.)
    - Just because your DirPort is open doesn't mean people should be
      able to remotely teach you about hidden service descriptors. Now
      only accept rendezvous posts if you've got HSAuthoritativeDir set.

  o Major bugfixes, other:
    - Don't crash on race condition in dns.c: tor_assert(!resolve->expire)
    - When a client asks the server to resolve (not connect to)
      an address, and it has a cached answer, give them the cached answer.
      Previously, the server would give them no answer at all.
    - Allow really slow clients to not hang up five minutes into their
      directory downloads (suggested by Adam J. Richter).
    - We were building exactly the wrong circuits when we anticipated
      hidden service requirements, meaning Tor would have to build all
      its circuits on demand.
    - Avoid crashing when we mmap a router cache file of size 0.
    - When testing reachability of our DirPort, don't launch new
      tests when there's already one in progress -- unreachable
      servers were stacking up dozens of testing streams.

  o Minor bugfixes, correctness:
    - If we're a directory mirror and we ask for "all" network status
      documents, we would discard status documents from authorities
      we don't recognize.
    - Avoid a memory corruption bug when creating a hash table for
      the first time.
    - Avoid controller-triggered crash when misusing certain commands
      from a v0 controller on platforms that do not handle
      printf("%s",NULL) gracefully.
    - Don't crash when a controller sends a third argument to an
      "extendcircuit" request.
    - Controller protocol fixes: fix encoding in "getinfo addr-mappings"
      response; fix error code when "getinfo dir/status/" fails.
    - Avoid crash when telling controller stream-status and a stream
      is detached.
    - Patch from Adam Langley to fix assert() in eventdns.c.
    - Fix a debug log message in eventdns to say "X resolved to Y"
      instead of "X resolved to X".
    - Make eventdns give strings for DNS errors, not just error numbers.
    - Track unreachable entry guards correctly: don't conflate
      'unreachable by us right now' with 'listed as down by the directory
      authorities'. With the old code, if a guard was unreachable by
      us but listed as running, it would clog our guard list forever.
    - Behave correctly in case we ever have a network with more than
      2GB/s total advertised capacity.
    - Make TrackExitHosts case-insensitive, and fix the behavior of
      ".suffix" TrackExitHosts items to avoid matching in the middle of
      an address.
    - Finally fix the openssl warnings from newer gccs that believe that
      ignoring a return value is okay, but casting a return value and
      then ignoring it is a sign of madness.
    - Prevent the contrib/exitlist script from printing the same
      result more than once.
    - Patch from Steve Hildrey: Generate network status correctly on
      non-versioning dirservers.
    - Don't listen to the X-Your-Address-Is hint if you did the lookup
      via Tor; otherwise you'll think you're the exit node's IP address.

  o Minor bugfixes, performance:
    - Two small performance improvements on parsing descriptors.
    - Major performance improvement on inserting descriptors: change
      algorithm from O(n^2) to O(n).
    - Make the common memory allocation path faster on machines where
      malloc(0) returns a pointer.
    - Start remembering X-Your-Address-Is directory hints even if you're
      a client, so you can become a server more smoothly.
    - Avoid duplicate entries on MyFamily line in server descriptor.

  o Packaging, features:
    - Remove architecture from OS X builds. The official builds are
      now universal binaries.
    - The Debian package now uses --verify-config when (re)starting,
      to distinguish configuration errors from other errors.
    - Update RPMs to require libevent 1.1b.

  o Packaging, bugfixes:
    - Patches so Tor builds with MinGW on Windows.
    - Patches so Tor might run on Cygwin again.
    - Resume building on non-gcc compilers and ancient gcc. Resume
      building with the -O0 compile flag. Resume building cleanly on
      Debian woody.
    - Run correctly on OS X platforms with case-sensitive filesystems.
    - Correct includes for net/if.h and net/pfvar.h on OpenBSD (from Tup).
    - Add autoconf checks so Tor can build on Solaris x86 again.

  o Documentation
    - Documented (and renamed) ServerDNSSearchDomains and
      ServerDNSResolvConfFile options.
    - Be clearer that the *ListenAddress directives can be repeated
      multiple times.


Changes in version 0.1.1.24 - 2006-09-29
  o Major bugfixes:
    - Allow really slow clients to not hang up five minutes into their
      directory downloads (suggested by Adam J. Richter).
    - Fix major performance regression from 0.1.0.x: instead of checking
      whether we have enough directory information every time we want to
      do something, only check when the directory information has changed.
      This should improve client CPU usage by 25-50%.
    - Don't crash if, after a server has been running for a while,
      it can't resolve its hostname.

  o Minor bugfixes:
    - Allow Tor to start when RunAsDaemon is set but no logs are set.
    - Don't crash when the controller receives a third argument to an
      "extendcircuit" request.
    - Controller protocol fixes: fix encoding in "getinfo addr-mappings"
      response; fix error code when "getinfo dir/status/" fails.
    - Fix configure.in to not produce broken configure files with
      more recent versions of autoconf. Thanks to Clint for his auto*
      voodoo.
    - Fix security bug on NetBSD that could allow someone to force
      uninitialized RAM to be sent to a server's DNS resolver. This
      only affects NetBSD and other platforms that do not bounds-check
      tolower().
    - Warn user when using libevent 1.1a or earlier with win32 or kqueue
      methods: these are known to be buggy.
    - If we're a directory mirror and we ask for "all" network status
      documents, we would discard status documents from authorities
      we don't recognize.


Changes in version 0.1.2.1-alpha - 2006-08-27
  o Major features:
    - Add "eventdns" async dns library from Adam Langley, tweaked to
      build on OSX and Windows. Only enabled if you pass the
      --enable-eventdns argument to configure.
    - Allow servers with no hostname or IP address to learn their
      IP address by asking the directory authorities. This code only
      kicks in when you would normally have exited with a "no address"
      error. Nothing's authenticated, so use with care.
    - Rather than waiting a fixed amount of time between retrying
      application connections, we wait only 5 seconds for the first,
      10 seconds for the second, and 15 seconds for each retry after
      that. Hopefully this will improve the expected user experience.
    - Patch from Tup to add support for transparent AP connections:
      this basically bundles the functionality of trans-proxy-tor
      into the Tor mainline. Now hosts with compliant pf/netfilter
      implementations can redirect TCP connections straight to Tor
      without diverting through SOCKS. Needs docs.
    - Busy directory servers save lots of memory by spooling server
      descriptors, v1 directories, and v2 networkstatus docs to buffers
      as needed rather than en masse. Also mmap the cached-routers
      files, so we don't need to keep the whole thing in memory too.
    - Automatically avoid picking more than one node from the same
      /16 network when constructing a circuit.
    - Revise and clean up the torrc.sample that we ship with; add
      a section for BandwidthRate and BandwidthBurst.

  o Minor features:
    - Split circuit_t into origin_circuit_t and or_circuit_t, and
      split connection_t into edge, or, dir, control, and base structs.
      These will save quite a bit of memory on busy servers, and they'll
      also help us track down bugs in the code and bugs in the spec.
    - Experimentally re-enable kqueue on OSX when using libevent 1.1b
      or later. Log when we are doing this, so we can diagnose it when
      it fails. (Also, recommend libevent 1.1b for kqueue and
      win32 methods; deprecate libevent 1.0b harder; make libevent
      recommendation system saner.)
    - Start being able to build universal binaries on OS X (thanks
      to Phobos).
    - Export the default exit policy via the control port, so controllers
      don't need to guess what it is / will be later.
    - Add a man page entry for ProtocolWarnings.
    - Add TestVia config option to the man page.
    - Remove even more protocol-related warnings from Tor server logs,
      such as bad TLS handshakes and malformed begin cells.
    - Stop fetching descriptors if you're not a dir mirror and you
      haven't tried to establish any circuits lately. [This currently
      causes some dangerous behavior, because when you start up again
      you'll use your ancient server descriptors.]
    - New DirPort behavior: if you have your dirport set, you download
      descriptors aggressively like a directory mirror, whether or not
      your ORPort is set.
    - Get rid of the router_retry_connections notion. Now routers
      no longer try to rebuild long-term connections to directory
      authorities, and directory authorities no longer try to rebuild
      long-term connections to all servers. We still don't hang up
      connections in these two cases though -- we need to look at it
      more carefully to avoid flapping, and we likely need to wait til
      0.1.1.x is obsolete.
    - Drop compatibility with obsolete Tors that permit create cells
      to have the wrong circ_id_type.
    - Re-enable per-connection rate limiting. Get rid of the "OP
      bandwidth" concept. Lay groundwork for "bandwidth classes" --
      separate global buckets that apply depending on what sort of conn
      it is.
    - Start publishing one minute or so after we find our ORPort
      to be reachable. This will help reduce the number of descriptors
      we have for ourselves floating around, since it's quite likely
      other things (e.g. DirPort) will change during that minute too.
    - Fork the v1 directory protocol into its own spec document,
      and mark dir-spec.txt as the currently correct (v2) spec.

  o Major bugfixes:
    - When we find our DirPort to be reachable, publish a new descriptor
      so we'll tell the world (reported by pnx).
    - Publish a new descriptor after we hup/reload. This is important
      if our config has changed such that we'll want to start advertising
      our DirPort now, etc.
    - Allow Tor to start when RunAsDaemon is set but no logs are set.
    - When we have a state file we cannot parse, tell the user and
      move it aside. Now we avoid situations where the user starts
      Tor in 1904, Tor writes a state file with that timestamp in it,
      the user fixes her clock, and Tor refuses to start.
    - Fix configure.in to not produce broken configure files with
      more recent versions of autoconf. Thanks to Clint for his auto*
      voodoo.
    - "tor --verify-config" now exits with -1(255) or 0 depending on
      whether the config options are bad or good.
    - Resolve bug 321 when using dnsworkers: append a period to every
      address we resolve at the exit node, so that we do not accidentally
      pick up local addresses, and so that failing searches are retried
      in the resolver search domains. (This is already solved for
      eventdns.) (This breaks Blossom servers for now.)
    - If we are using an exit enclave and we can't connect, e.g. because
      its webserver is misconfigured to not listen on localhost, then
      back off and try connecting from somewhere else before we fail.

  o Minor bugfixes:
    - Start compiling on MinGW on Windows (patches from Mike Chiussi).
    - Start compiling on MSVC6 on Windows (patches from Frediano Ziglio).
    - Fix bug 314: Tor clients issued "unsafe socks" warnings even
      when the IP address is mapped through MapAddress to a hostname.
    - Start passing "ipv4" hints to getaddrinfo(), so servers don't do
      useless IPv6 DNS resolves.
    - Patch suggested by Karsten Loesing: respond to SIGNAL command
      before we execute the signal, in case the signal shuts us down.
    - Clean up AllowInvalidNodes man page entry.
    - Claim a commonname of Tor, rather than TOR, in TLS handshakes.
    - Add more asserts to track down an assert error on a windows Tor
      server with connection_add being called with socket == -1.
    - Handle reporting OR_CONN_EVENT_NEW events to the controller.
    - Fix misleading log messages: an entry guard that is "unlisted",
      as well as not known to be "down" (because we've never heard
      of it), is not therefore "up".
    - Remove code to special-case "-cvs" ending, since it has not
      actually mattered since 0.0.9.
    - Make our socks5 handling more robust to broken socks clients:
      throw out everything waiting on the buffer in between socks
      handshake phases, since they can't possibly (so the theory
      goes) have predicted what we plan to respond to them.


Changes in version 0.1.1.23 - 2006-07-30
  o Major bugfixes:
    - Fast Tor servers, especially exit nodes, were triggering asserts
      due to a bug in handling the list of pending DNS resolves. Some
      bugs still remain here; we're hunting them.
    - Entry guards could crash clients by sending unexpected input.
    - More fixes on reachability testing: if you find yourself reachable,
      then don't ever make any client requests (so you stop predicting
      circuits), then hup or have your clock jump, then later your IP
      changes, you won't think circuits are working, so you won't try to
      test reachability, so you won't publish.

  o Minor bugfixes:
    - Avoid a crash if the controller does a resetconf firewallports
      and then a setconf fascistfirewall=1.
    - Avoid an integer underflow when the dir authority decides whether
      a router is stable: we might wrongly label it stable, and compute
      a slightly wrong median stability, when a descriptor is published
      later than now.
    - Fix a place where we might trigger an assert if we can't build our
      own server descriptor yet.


Changes in version 0.1.1.22 - 2006-07-05
  o Major bugfixes:
    - Fix a big bug that was causing servers to not find themselves
      reachable if they changed IP addresses. Since only 0.1.1.22+
      servers can do reachability testing correctly, now we automatically
      make sure to test via one of these.
    - Fix to allow clients and mirrors to learn directory info from
      descriptor downloads that get cut off partway through.
    - Directory authorities had a bug in deciding if a newly published
      descriptor was novel enough to make everybody want a copy -- a few
      servers seem to be publishing new descriptors many times a minute.
  o Minor bugfixes:
    - Fix a rare bug that was causing some servers to complain about
      "closing wedged cpuworkers" and skip some circuit create requests.
    - Make the Exit flag in directory status documents actually work.


Changes in version 0.1.1.21 - 2006-06-10
  o Crash and assert fixes from 0.1.1.20:
    - Fix a rare crash on Tor servers that have enabled hibernation.
    - Fix a seg fault on startup for Tor networks that use only one
      directory authority.
    - Fix an assert from a race condition that occurs on Tor servers
      while exiting, where various threads are trying to log that they're
      exiting, and delete the logs, at the same time.
    - Make our unit tests pass again on certain obscure platforms.

  o Other fixes:
    - Add support for building SUSE RPM packages.
    - Speed up initial bootstrapping for clients: if we are making our
      first ever connection to any entry guard, then don't mark it down
      right after that.
    - When only one Tor server in the network is labelled as a guard,
      and we've already picked him, we would cycle endlessly picking him
      again, being unhappy about it, etc. Now we specifically exclude
      current guards when picking a new guard.
    - Servers send create cells more reliably after the TLS connection
      is established: we were sometimes forgetting to send half of them
      when we had more than one pending.
    - If we get a create cell that asks us to extend somewhere, but the
      Tor server there doesn't match the expected digest, we now send
      a destroy cell back, rather than silently doing nothing.
    - Make options->RedirectExit work again.
    - Make cookie authentication for the controller work again.
    - Stop being picky about unusual characters in the arguments to
      mapaddress. It's none of our business.
    - Add a new config option "TestVia" that lets you specify preferred
      middle hops to use for test circuits. Perhaps this will let me
      debug the reachability problems better.

  o Log / documentation fixes:
    - If we're a server and some peer has a broken TLS certificate, don't
      log about it unless ProtocolWarnings is set, i.e., we want to hear
      about protocol violations by others.
    - Fix spelling of VirtualAddrNetwork in man page.
    - Add a better explanation at the top of the autogenerated torrc file
      about what happened to our old torrc.


Changes in version 0.1.1.20 - 2006-05-23
  o Bugfixes:
    - Downgrade a log severity where servers complain that they're
      invalid.
    - Avoid a compile warning on FreeBSD.
    - Remove string size limit on NEWDESC messages; solve bug 291.
    - Correct the RunAsDaemon entry in the man page; ignore RunAsDaemon
      more thoroughly when we're running on windows.


Changes in version 0.1.1.19-rc - 2006-05-03
  o Minor bugs:
    - Regenerate our local descriptor if it's dirty and we try to use
      it locally (e.g. if it changes during reachability detection).
    - If we setconf our ORPort to 0, we continued to listen on the
      old ORPort and receive connections.
    - Avoid a second warning about machine/limits.h on Debian
      GNU/kFreeBSD.
    - Be willing to add our own routerinfo into the routerlist.
      Now authorities will include themselves in their directories
      and network-statuses.
    - Stop trying to upload rendezvous descriptors to every
      directory authority: only try the v1 authorities.
    - Servers no longer complain when they think they're not
      registered with the directory authorities. There were too many
      false positives.
    - Backport dist-rpm changes so rpms can be built without errors.

  o Features:
    - Implement an option, VirtualAddrMask, to set which addresses
      get handed out in response to mapaddress requests. This works
      around a bug in tsocks where 127.0.0.0/8 is never socksified.


Changes in version 0.1.1.18-rc - 2006-04-10
  o Major fixes:
    - Work harder to download live network-statuses from all the
      directory authorities we know about. Improve the threshold
      decision logic so we're more robust to edge cases.
    - When fetching rendezvous descriptors, we were willing to ask
      v2 authorities too, which would always return 404.

  o Minor fixes:
    - Stop listing down or invalid nodes in the v1 directory. This will
      reduce its bulk by about 1/3, and reduce load on directory
      mirrors.
    - When deciding whether a router is Fast or Guard-worthy, consider
      his advertised BandwidthRate and not just the BandwidthCapacity.
    - No longer ship INSTALL and README files -- they are useless now.
    - Force rpmbuild to behave and honor target_cpu.
    - Avoid warnings about machine/limits.h on Debian GNU/kFreeBSD.
    - Start to include translated versions of the tor-doc-*.html
      files, along with the screenshots. Still needs more work.
    - Start sending back 512 and 451 errors if mapaddress fails,
      rather than not sending anything back at all.
    - When we fail to bind or listen on an incoming or outgoing
      socket, we should close it before failing. otherwise we just
      leak it. (thanks to weasel for finding.)
    - Allow "getinfo dir/status/foo" to work, as long as your DirPort
      is enabled. (This is a hack, and will be fixed in 0.1.2.x.)
    - Make NoPublish (even though deprecated) work again.
    - Fix a minor security flaw where a versioning auth dirserver
      could list a recommended version many times in a row to make
      clients more convinced that it's recommended.
    - Fix crash bug if there are two unregistered servers running
      with the same nickname, one of them is down, and you ask for
      them by nickname in your EntryNodes or ExitNodes. Also, try
      to pick the one that's running rather than an arbitrary one.
    - Fix an infinite loop we could hit if we go offline for too long.
    - Complain when we hit WSAENOBUFS on recv() or write() too.
      Perhaps this will help us hunt the bug.
    - If you're not a versioning dirserver, don't put the string
      "client-versions \nserver-versions \n" in your network-status.
    - Lower the minimum required number of file descriptors to 1000,
      so we can have some overhead for Valgrind on Linux, where the
      default ulimit -n is 1024.

  o New features:
    - Add tor.dizum.com as the fifth authoritative directory server.
    - Add a new config option FetchUselessDescriptors, off by default,
      for when you plan to run "exitlist" on your client and you want
      to know about even the non-running descriptors.


Changes in version 0.1.1.17-rc - 2006-03-28
  o Major fixes:
    - Clients and servers since 0.1.1.10-alpha have been expiring
      connections whenever they are idle for 5 minutes and they *do*
      have circuits on them. Oops. With this new version, clients will
      discard their previous entry guard choices and avoid choosing
      entry guards running these flawed versions.
    - Fix memory leak when uncompressing concatenated zlib streams. This
      was causing substantial leaks over time on Tor servers.
    - The v1 directory was including servers as much as 48 hours old,
      because that's how the new routerlist->routers works. Now only
      include them if they're 20 hours old or less.

  o Minor fixes:
    - Resume building on irix64, netbsd 2.0, etc.
    - On non-gcc compilers (e.g. solaris), use "-g -O" instead of
      "-Wall -g -O2".
    - Stop writing the "router.desc" file, ever. Nothing uses it anymore,
      and it is confusing some users.
    - Mirrors stop caching the v1 directory so often.
    - Make the max number of old descriptors that a cache will hold
      rise with the number of directory authorities, so we can scale.
    - Change our win32 uname() hack to be more forgiving about what
      win32 versions it thinks it's found.

  o New features:
    - Add lefkada.eecs.harvard.edu as a fourth authoritative directory
      server.
    - When the controller's *setconf commands fail, collect an error
      message in a string and hand it back to the controller.
    - Make the v2 dir's "Fast" flag based on relative capacity, just
      like "Stable" is based on median uptime. Name everything in the
      top 7/8 Fast, and only the top 1/2 gets to be a Guard.
    - Log server fingerprint on startup, so new server operators don't
      have to go hunting around their filesystem for it.
    - Return a robots.txt on our dirport to discourage google indexing.
    - Let the controller ask for GETINFO dir/status/foo so it can ask
      directly rather than connecting to the dir port. Only works when
      dirport is set for now.

  o New config options rather than constants in the code:
    - SocksTimeout: How long do we let a socks connection wait
      unattached before we fail it?
    - CircuitBuildTimeout: Cull non-open circuits that were born
      at least this many seconds ago.
    - CircuitIdleTimeout: Cull open clean circuits that were born
      at least this many seconds ago.


Changes in version 0.1.1.16-rc - 2006-03-18
  o Bugfixes on 0.1.1.15-rc:
    - Fix assert when the controller asks to attachstream a connect-wait
      or resolve-wait stream.
    - Now do address rewriting when the controller asks us to attach
      to a particular circuit too. This will let Blossom specify
      "moria2.exit" without having to learn what moria2's IP address is.
    - Make the "tor --verify-config" command-line work again, so people
      can automatically check if their torrc will parse.
    - Authoritative dirservers no longer require an open connection from
      a server to consider him "reachable". We need this change because
      when we add new auth dirservers, old servers won't know not to
      hang up on them.
    - Let Tor build on Sun CC again.
    - Fix an off-by-one buffer size in dirserv.c that magically never
      hit our three authorities but broke sjmurdoch's own tor network.
    - If we as a directory mirror don't know of any v1 directory
      authorities, then don't try to cache any v1 directories.
    - Stop warning about unknown servers in our family when they are
      given as hex digests.
    - Stop complaining as quickly to the server operator that he
      hasn't registered his nickname/key binding.
    - Various cleanups so we can add new V2 Auth Dirservers.
    - Change "AllowUnverifiedNodes" to "AllowInvalidNodes", to
      reflect the updated flags in our v2 dir protocol.
    - Resume allowing non-printable characters for exit streams (both
      for connecting and for resolving). Now we tolerate applications
      that don't follow the RFCs. But continue to block malformed names
      at the socks side.

  o Bugfixes on 0.1.0.x:
    - Fix assert bug in close_logs(): when we close and delete logs,
      remove them all from the global "logfiles" list.
    - Fix minor integer overflow in calculating when we expect to use up
      our bandwidth allocation before hibernating.
    - Fix a couple of bugs in OpenSSL detection. Also, deal better when
      there are multiple SSLs installed with different versions.
    - When we try to be a server and Address is not explicitly set and
      our hostname resolves to a private IP address, try to use an
      interface address if it has a public address. Now Windows machines
      that think of themselves as localhost can work by default.

  o New features:
    - Let the controller ask for GETINFO dir/server/foo so it can ask
      directly rather than connecting to the dir port.
    - Let the controller tell us about certain router descriptors
      that it doesn't want Tor to use in circuits. Implement
      SETROUTERPURPOSE and modify +POSTDESCRIPTOR to do this.
    - New config option SafeSocks to reject all application connections
      using unsafe socks protocols. Defaults to off.


Changes in version 0.1.1.15-rc - 2006-03-11
  o Bugfixes and cleanups:
    - When we're printing strings from the network, don't try to print
      non-printable characters. This protects us against shell escape
      sequence exploits, and also against attacks to fool humans into
      misreading their logs.
    - Fix a bug where Tor would fail to establish any connections if you
      left it off for 24 hours and then started it: we were happy with
      the obsolete network statuses, but they all referred to router
      descriptors that were too old to fetch, so we ended up with no
      valid router descriptors.
    - Fix a seg fault in the controller's "getinfo orconn-status"
      command while listing status on incoming handshaking connections.
      Introduce a status name "NEW" for these connections.
    - If we get a linelist or linelist_s config option from the torrc
      (e.g. ExitPolicy) and it has no value, warn and skip rather than
      silently resetting it to its default.
    - Don't abandon entry guards until they've been down or gone for
      a whole month.
    - Cleaner and quieter log messages.

  o New features:
    - New controller signal NEWNYM that makes new application requests
      use clean circuits.
    - Add a new circuit purpose 'controller' to let the controller ask
      for a circuit that Tor won't try to use. Extend the EXTENDCIRCUIT
      controller command to let you specify the purpose if you're
      starting a new circuit.  Add a new SETCIRCUITPURPOSE controller
      command to let you change a circuit's purpose after it's been
      created.
    - Accept "private:*" in routerdesc exit policies; not generated yet
      because older Tors do not understand it.
    - Add BSD-style contributed startup script "rc.subr" from Peter
      Thoenen.


Changes in version 0.1.1.14-alpha - 2006-02-20
  o Bugfixes on 0.1.1.x:
    - Don't die if we ask for a stdout or stderr log (even implicitly)
      and we're set to RunAsDaemon -- just warn.
    - We still had a few bugs in the OR connection rotation code that
      caused directory servers to slowly aggregate connections to other
      fast Tor servers. This time for sure!
    - Make log entries on Win32 include the name of the function again.
    - We were treating a pair of exit policies if they were equal even
      if one said accept and the other said reject -- causing us to
      not always publish a new descriptor since we thought nothing
      had changed.
    - Retry pending server downloads as well as pending networkstatus
      downloads when we unexpectedly get a socks request.
    - We were ignoring the IS_FAST flag in the directory status,
      meaning we were willing to pick trivial-bandwidth nodes for "fast"
      connections.
    - If the controller's SAVECONF command fails (e.g. due to file
      permissions), let the controller know that it failed.

  o Features:
    - If we're trying to be a Tor server and running Windows 95/98/ME
      as a server, explain that we'll likely crash.
    - When we're a server, a client asks for an old-style directory,
      and our write bucket is empty, don't give it to him. This way
      small servers can continue to serve the directory *sometimes*,
      without getting overloaded.
    - Compress exit policies even more -- look for duplicate lines
      and remove them.
    - Clients now honor the "guard" flag in the router status when
      picking entry guards, rather than looking at is_fast or is_stable.
    - Retain unrecognized lines in $DATADIR/state file, so that we can
      be forward-compatible.
    - Generate 18.0.0.0/8 address policy format in descs when we can;
      warn when the mask is not reducible to a bit-prefix.
    - Let the user set ControlListenAddress in the torrc.  This can be
      dangerous, but there are some cases (like a secured LAN) where it
      makes sense.
    - Split ReachableAddresses into ReachableDirAddresses and
      ReachableORAddresses, so we can restrict Dir conns to port 80
      and OR conns to port 443.
    - Now we can target arch and OS in rpm builds (contributed by
      Phobos). Also make the resulting dist-rpm filename match the
      target arch.
    - New config options to help controllers: FetchServerDescriptors
      and FetchHidServDescriptors for whether to fetch server
      info and hidserv info or let the controller do it, and
      PublishServerDescriptor and PublishHidServDescriptors.
    - Also let the controller set the __AllDirActionsPrivate config
      option if you want all directory fetches/publishes to happen via
      Tor (it assumes your controller bootstraps your circuits).


Changes in version 0.1.0.17 - 2006-02-17
  o Crash bugfixes on 0.1.0.x:
    - When servers with a non-zero DirPort came out of hibernation,
      sometimes they would trigger an assert.

  o Other important bugfixes:
    - On platforms that don't have getrlimit (like Windows), we were
      artificially constraining ourselves to a max of 1024
      connections. Now just assume that we can handle as many as 15000
      connections. Hopefully this won't cause other problems.

  o Backported features:
    - When we're a server, a client asks for an old-style directory,
      and our write bucket is empty, don't give it to him. This way
      small servers can continue to serve the directory *sometimes*,
      without getting overloaded.
    - Whenever you get a 503 in response to a directory fetch, try
      once more. This will become important once servers start sending
      503's whenever they feel busy.
    - Fetch a new directory every 120 minutes, not every 40 minutes.
      Now that we have hundreds of thousands of users running the old
      directory algorithm, it's starting to hurt a lot.
    - Bump up the period for forcing a hidden service descriptor upload
      from 20 minutes to 1 hour.


Changes in version 0.1.1.13-alpha - 2006-02-09
  o Crashes in 0.1.1.x:
    - When you tried to setconf ORPort via the controller, Tor would
      crash. So people using TorCP to become a server were sad.
    - Solve (I hope) the stack-smashing bug that we were seeing on fast
      servers. The problem appears to be something do with OpenSSL's
      random number generation, or how we call it, or something. Let me
      know if the crashes continue.
    - Turn crypto hardware acceleration off by default, until we find
      somebody smart who can test it for us. (It appears to produce
      seg faults in at least some cases.)
    - Fix a rare assert error when we've tried all intro points for
      a hidden service and we try fetching the service descriptor again:
      "Assertion conn->state != AP_CONN_STATE_RENDDESC_WAIT failed"

  o Major fixes:
    - Fix a major load balance bug: we were round-robining in 16 KB
      chunks, and servers with bandwidthrate of 20 KB, while downloading
      a 600 KB directory, would starve their other connections. Now we
      try to be a bit more fair.
    - Dir authorities and mirrors were never expiring the newest
      descriptor for each server, causing memory and directory bloat.
    - Fix memory-bloating and connection-bloating bug on servers: We
      were never closing any connection that had ever had a circuit on
      it, because we were checking conn->n_circuits == 0, yet we had a
      bug that let it go negative.
    - Make Tor work using squid as your http proxy again -- squid
      returns an error if you ask for a URL that's too long, and it uses
      a really generic error message. Plus, many people are behind a
      transparent squid so they don't even realize it.
    - On platforms that don't have getrlimit (like Windows), we were
      artificially constraining ourselves to a max of 1024
      connections. Now just assume that we can handle as many as 15000
      connections. Hopefully this won't cause other problems.
    - Add a new config option ExitPolicyRejectPrivate which defaults to
      1. This means all exit policies will begin with rejecting private
      addresses, unless the server operator explicitly turns it off.

  o Major features:
    - Clients no longer download descriptors for non-running
      descriptors.
    - Before we add new directory authorities, we should make it
      clear that only v1 authorities should receive/publish hidden
      service descriptors.

  o Minor features:
    - As soon as we've fetched some more directory info, immediately
      try to download more server descriptors. This way we don't have
      a 10 second pause during initial bootstrapping.
    - Remove even more loud log messages that the server operator can't
      do anything about.
    - When we're running an obsolete or un-recommended version, make
      the log message more clear about what the problem is and what
      versions *are* still recommended.
    - Provide a more useful warn message when our onion queue gets full:
      the CPU is too slow or the exit policy is too liberal.
    - Don't warn when we receive a 503 from a dirserver/cache -- this
      will pave the way for them being able to refuse if they're busy.
    - When we fail to bind a listener, try to provide a more useful
      log message: e.g., "Is Tor already running?"
    - Adjust tor-spec to parameterize cell and key lengths. Now Ian
      Goldberg can prove things about our handshake protocol more
      easily.
    - MaxConn has been obsolete for a while now. Document the ConnLimit
      config option, which is a *minimum* number of file descriptors
      that must be available else Tor refuses to start.
    - Apply Matt Ghali's --with-syslog-facility patch to ./configure
      if you log to syslog and want something other than LOG_DAEMON.
    - Make dirservers generate a separate "guard" flag to mean,
      "would make a good entry guard". Make clients parse it and vote
      on it. Not used by clients yet.
    - Implement --with-libevent-dir option to ./configure. Also, improve
      search techniques to find libevent, and use those for openssl too.
    - Bump the default bandwidthrate to 3 MB, and burst to 6 MB
    - Only start testing reachability once we've established a
      circuit. This will make startup on dirservers less noisy.
    - Don't try to upload hidden service descriptors until we have
      established a circuit.
    - Fix the controller's "attachstream 0" command to treat conn like
      it just connected, doing address remapping, handling .exit and
      .onion idioms, and so on. Now we're more uniform in making sure
      that the controller hears about new and closing connections.


Changes in version 0.1.1.12-alpha - 2006-01-11
  o Bugfixes on 0.1.1.x:
    - The fix to close duplicate server connections was closing all
      Tor client connections if they didn't establish a circuit
      quickly enough. Oops.
    - Fix minor memory issue (double-free) that happened on exit.

  o Bugfixes on 0.1.0.x:
    - Tor didn't warn when it failed to open a log file.


Changes in version 0.1.1.11-alpha - 2006-01-10
  o Crashes in 0.1.1.x:
    - Include all the assert/crash fixes from 0.1.0.16.
    - If you start Tor and then quit very quickly, there were some
      races that tried to free things that weren't allocated yet.
    - Fix a rare memory stomp if you're running hidden services.
    - Fix segfault when specifying DirServer in config without nickname.
    - Fix a seg fault when you finish connecting to a server but at
      that moment you dump his server descriptor.
    - Extendcircuit and Attachstream controller commands would
      assert/crash if you don't give them enough arguments.
    - Fix an assert error when we're out of space in the connection_list
      and we try to post a hidden service descriptor (reported by weasel).
    - If you specify a relative torrc path and you set RunAsDaemon in
      your torrc, then it chdir()'s to the new directory. If you HUP,
      it tries to load the new torrc location, fails, and exits.
      The fix: no longer allow a relative path to torrc using -f.

  o Major features:
    - Implement "entry guards": automatically choose a handful of entry
      nodes and stick with them for all circuits. Only pick new guards
      when the ones you have are unsuitable, and if the old guards
      become suitable again, switch back. This will increase security
      dramatically against certain end-point attacks. The EntryNodes
      config option now provides some hints about which entry guards you
      want to use most; and StrictEntryNodes means to only use those.
    - New directory logic: download by descriptor digest, not by
      fingerprint. Caches try to download all listed digests from
      authorities; clients try to download "best" digests from caches.
      This avoids partitioning and isolating attacks better.
    - Make the "stable" router flag in network-status be the median of
      the uptimes of running valid servers, and make clients pay
      attention to the network-status flags. Thus the cutoff adapts
      to the stability of the network as a whole, making IRC, IM, etc
      connections more reliable.

  o Major fixes:
    - Tor servers with dynamic IP addresses were needing to wait 18
      hours before they could start doing reachability testing using
      the new IP address and ports. This is because they were using
      the internal descriptor to learn what to test, yet they were only
      rebuilding the descriptor once they decided they were reachable.
    - Tor 0.1.1.9 and 0.1.1.10 had a serious bug that caused clients
      to download certain server descriptors, throw them away, and then
      fetch them again after 30 minutes. Now mirrors throw away these
      server descriptors so clients can't get them.
    - We were leaving duplicate connections to other ORs open for a week,
      rather than closing them once we detect a duplicate. This only
      really affected authdirservers, but it affected them a lot.
    - Spread the authdirservers' reachability testing over the entire
      testing interval, so we don't try to do 500 TLS's at once every
      20 minutes.

  o Minor fixes:
    - If the network is down, and we try to connect to a conn because
      we have a circuit in mind, and we timeout (30 seconds) because the
      network never answers, we were expiring the circuit, but we weren't
      obsoleting the connection or telling the entry_guards functions.
    - Some Tor servers process billions of cells per day. These statistics
      need to be uint64_t's.
    - Check for integer overflows in more places, when adding elements
      to smartlists. This could possibly prevent a buffer overflow
      on malicious huge inputs. I don't see any, but I haven't looked
      carefully.
    - ReachableAddresses kept growing new "reject *:*" lines on every
      setconf/reload.
    - When you "setconf log" via the controller, it should remove all
      logs. We were automatically adding back in a "log notice stdout".
    - Newly bootstrapped Tor networks couldn't establish hidden service
      circuits until they had nodes with high uptime. Be more tolerant.
    - We were marking servers down when they could not answer every piece
      of the directory request we sent them. This was far too harsh.
    - Fix the torify (tsocks) config file to not use Tor for localhost
      connections.
    - Directory authorities now go to the proper authority when asking for
      a networkstatus, even when they want a compressed one.
    - Fix a harmless bug that was causing Tor servers to log
      "Got an end because of misc error, but we're not an AP. Closing."
    - Authorities were treating their own descriptor changes as cosmetic,
      meaning the descriptor available in the network-status and the
      descriptor that clients downloaded were different.
    - The OS X installer was adding a symlink for tor_resolve but
      the binary was called tor-resolve (reported by Thomas Hardly).
    - Workaround a problem with some http proxies where they refuse GET
      requests that specify "Content-Length: 0" (reported by Adrian).
    - Fix wrong log message when you add a "HiddenServiceNodes" config
      line without any HiddenServiceDir line (reported by Chris Thomas).

  o Minor features:
    - Write the TorVersion into the state file so we have a prayer of
      keeping forward and backward compatibility.
    - Revive the FascistFirewall config option rather than eliminating it:
      now it's a synonym for ReachableAddresses *:80,*:443.
    - Clients choose directory servers from the network status lists,
      not from their internal list of router descriptors. Now they can
      go to caches directly rather than needing to go to authorities
      to bootstrap.
    - Directory authorities ignore router descriptors that have only
      cosmetic differences: do this for 0.1.0.x servers now too.
    - Add a new flag to network-status indicating whether the server
      can answer v2 directory requests too.
    - Authdirs now stop whining so loudly about bad descriptors that
      they fetch from other dirservers. So when there's a log complaint,
      it's for sure from a freshly uploaded descriptor.
    - Reduce memory requirements in our structs by changing the order
      of fields.
    - There used to be two ways to specify your listening ports in a
      server descriptor: on the "router" line and with a separate "ports"
      line. Remove support for the "ports" line.
    - New config option "AuthDirRejectUnlisted" for auth dirservers as
      a panic button: if we get flooded with unusable servers we can
      revert to only listing servers in the approved-routers file.
    - Auth dir servers can now mark a fingerprint as "!reject" or
      "!invalid" in the approved-routers file (as its nickname), to
      refuse descriptors outright or include them but marked as invalid.
    - Servers store bandwidth history across restarts/crashes.
    - Add reasons to DESTROY and RELAY_TRUNCATED cells, so clients can
      get a better idea of why their circuits failed. Not used yet.
    - Directory mirrors now cache up to 16 unrecognized network-status
      docs. Now we can add new authdirservers and they'll be cached too.
    - When picking a random directory, prefer non-authorities if any
      are known.
    - New controller option "getinfo desc/all-recent" to fetch the
      latest server descriptor for every router that Tor knows about.


Changes in version 0.1.0.16 - 2006-01-02
  o Crash bugfixes on 0.1.0.x:
    - On Windows, build with a libevent patch from "I-M Weasel" to avoid
      corrupting the heap, losing FDs, or crashing when we need to resize
      the fd_sets. (This affects the Win32 binaries, not Tor's sources.)
    - It turns out sparc64 platforms crash on unaligned memory access
      too -- so detect and avoid this.
    - Handle truncated compressed data correctly (by detecting it and
      giving an error).
    - Fix possible-but-unlikely free(NULL) in control.c.
    - When we were closing connections, there was a rare case that
      stomped on memory, triggering seg faults and asserts.
    - Avoid potential infinite recursion when building a descriptor. (We
      don't know that it ever happened, but better to fix it anyway.)
    - We were neglecting to unlink marked circuits from soon-to-close OR
      connections, which caused some rare scribbling on freed memory.
    - Fix a memory stomping race bug when closing the joining point of two
      rendezvous circuits.
    - Fix an assert in time parsing found by Steven Murdoch.

  o Other bugfixes on 0.1.0.x:
    - When we're doing reachability testing, provide more useful log
      messages so the operator knows what to expect.
    - Do not check whether DirPort is reachable when we are suppressing
      advertising it because of hibernation.
    - When building with -static or on Solaris, we sometimes needed -ldl.
    - When we're deciding whether a stream has enough circuits around
      that can handle it, count the freshly dirty ones and not the ones
      that are so dirty they won't be able to handle it.
    - When we're expiring old circuits, we had a logic error that caused
      us to close new rendezvous circuits rather than old ones.
    - Give a more helpful log message when you try to change ORPort via
      the controller: you should upgrade Tor if you want that to work.
    - We were failing to parse Tor versions that start with "Tor ".
    - Tolerate faulty streams better: when a stream fails for reason
      exitpolicy, stop assuming that the router is lying about his exit
      policy. When a stream fails for reason misc, allow it to retry just
      as if it was resolvefailed. When a stream has failed three times,
      reset its failure count so we can try again and get all three tries.


Changes in version 0.1.1.10-alpha - 2005-12-11
  o Correctness bugfixes on 0.1.0.x:
    - On Windows, build with a libevent patch from "I-M Weasel" to avoid
      corrupting the heap, losing FDs, or crashing when we need to resize
      the fd_sets. (This affects the Win32 binaries, not Tor's sources.)
    - Stop doing the complex voodoo overkill checking for insecure
      Diffie-Hellman keys. Just check if it's in [2,p-2] and be happy.
    - When we were closing connections, there was a rare case that
      stomped on memory, triggering seg faults and asserts.
    - We were neglecting to unlink marked circuits from soon-to-close OR
      connections, which caused some rare scribbling on freed memory.
    - When we're deciding whether a stream has enough circuits around
      that can handle it, count the freshly dirty ones and not the ones
      that are so dirty they won't be able to handle it.
    - Recover better from TCP connections to Tor servers that are
      broken but don't tell you (it happens!); and rotate TLS
      connections once a week.
    - When we're expiring old circuits, we had a logic error that caused
      us to close new rendezvous circuits rather than old ones.
    - Fix a scary-looking but apparently harmless bug where circuits
      would sometimes start out in state CIRCUIT_STATE_OR_WAIT at
      servers, and never switch to state CIRCUIT_STATE_OPEN.
    - When building with -static or on Solaris, we sometimes needed to
      build with -ldl.
    - Give a useful message when people run Tor as the wrong user,
      rather than telling them to start chowning random directories.
    - We were failing to inform the controller about new .onion streams.

  o Security bugfixes on 0.1.0.x:
    - Refuse server descriptors if the fingerprint line doesn't match
      the included identity key. Tor doesn't care, but other apps (and
      humans) might actually be trusting the fingerprint line.
    - We used to kill the circuit when we receive a relay command we
      don't recognize. Now we just drop it.
    - Start obeying our firewall options more rigorously:
      . If we can't get to a dirserver directly, try going via Tor.
      . Don't ever try to connect (as a client) to a place our
        firewall options forbid.
      . If we specify a proxy and also firewall options, obey the
        firewall options even when we're using the proxy: some proxies
        can only proxy to certain destinations.
    - Fix a bug found by Lasse Overlier: when we were making internal
      circuits (intended to be cannibalized later for rendezvous and
      introduction circuits), we were picking them so that they had
      useful exit nodes. There was no need for this, and it actually
      aids some statistical attacks.
    - Start treating internal circuits and exit circuits separately.
      It's important to keep them separate because internal circuits
      have their last hops picked like middle hops, rather than like
      exit hops. So exiting on them will break the user's expectations.

  o Bugfixes on 0.1.1.x:
    - Take out the mis-feature where we tried to detect IP address
      flapping for people with DynDNS, and chose not to upload a new
      server descriptor sometimes.
    - Try to be compatible with OpenSSL 0.9.6 again.
    - Log fix: when the controller is logging about .onion addresses,
      sometimes it didn't include the ".onion" part of the address.
    - Don't try to modify options->DirServers internally -- if the
      user didn't specify any, just add the default ones directly to
      the trusted dirserver list. This fixes a bug where people running
      controllers would use SETCONF on some totally unrelated config
      option, and Tor would start yelling at them about changing their
      DirServer lines.
    - Let the controller's redirectstream command specify a port, in
      case the controller wants to change that too.
    - When we requested a pile of server descriptors, we sometimes
      accidentally launched a duplicate request for the first one.
    - Bugfix for trackhostexits: write down the fingerprint of the
      chosen exit, not its nickname, because the chosen exit might not
      be verified.
    - When parsing foo.exit, if foo is unknown, and we are leaving
      circuits unattached, set the chosen_exit field and leave the
      address empty. This matters because controllers got confused
      otherwise.
    - Directory authorities no longer try to download server
      descriptors that they know they will reject.

  o Features and updates:
    - Replace balanced trees with hash tables: this should make stuff
      significantly faster.
    - Resume using the AES counter-mode implementation that we ship,
      rather than OpenSSL's. Ours is significantly faster.
    - Many other CPU and memory improvements.
    - Add a new config option FastFirstHopPK (on by default) so clients
      do a trivial crypto handshake for their first hop, since TLS has
      already taken care of confidentiality and authentication.
    - Add a new config option TestSocks so people can see if their
      applications are using socks4, socks4a, socks5-with-ip, or
      socks5-with-hostname. This way they don't have to keep mucking
      with tcpdump and wondering if something got cached somewhere.
    - Warn when listening on a public address for socks. I suspect a
      lot of people are setting themselves up as open socks proxies,
      and they have no idea that jerks on the Internet are using them,
      since they simply proxy the traffic into the Tor network.
    - Add "private:*" as an alias in configuration for policies. Now
      you can simplify your exit policy rather than needing to list
      every single internal or nonroutable network space.
    - Add a new controller event type that allows controllers to get
      all server descriptors that were uploaded to a router in its role
      as authoritative dirserver.
    - Start shipping socks-extensions.txt, tor-doc-unix.html,
      tor-doc-server.html, and stylesheet.css in the tarball.
    - Stop shipping tor-doc.html in the tarball.


Changes in version 0.1.1.9-alpha - 2005-11-15
  o Usability improvements:
    - Start calling it FooListenAddress rather than FooBindAddress,
      since few of our users know what it means to bind an address
      or port.
    - Reduce clutter in server logs. We're going to try to make
      them actually usable now. New config option ProtocolWarnings that
      lets you hear about how _other Tors_ are breaking the protocol. Off
      by default.
    - Divide log messages into logging domains. Once we put some sort
      of interface on this, it will let people looking at more verbose
      log levels specify the topics they want to hear more about.
    - Make directory servers return better http 404 error messages
      instead of a generic "Servers unavailable".
    - Check for even more Windows version flags when writing the platform
      string in server descriptors, and note any we don't recognize.
    - Clean up more of the OpenSSL memory when exiting, so we can detect
      memory leaks better.
    - Make directory authorities be non-versioning, non-naming by
      default. Now we can add new directory servers without requiring
      their operators to pay close attention.
    - When logging via syslog, include the pid whenever we provide
      a log entry. Suggested by Todd Fries.

  o Performance improvements:
    - Directory servers now silently throw away new descriptors that
      haven't changed much if the timestamps are similar. We do this to
      tolerate older Tor servers that upload a new descriptor every 15
      minutes. (It seemed like a good idea at the time.)
    - Inline bottleneck smartlist functions; use fast versions by default.
    - Add a "Map from digest to void*" abstraction digestmap_t so we
      can do less hex encoding/decoding. Use it in router_get_by_digest()
      to resolve a performance bottleneck.
    - Allow tor_gzip_uncompress to extract as much as possible from
      truncated compressed data. Try to extract as many
      descriptors as possible from truncated http responses (when
      DIR_PURPOSE_FETCH_ROUTERDESC).
    - Make circ->onionskin a pointer, not a static array. moria2 was using
      125000 circuit_t's after it had been up for a few weeks, which
      translates to 20+ megs of wasted space.
    - The private half of our EDH handshake keys are now chosen out
      of 320 bits, not 1024 bits. (Suggested by Ian Goldberg.)

  o Security improvements:
    - Start making directory caches retain old routerinfos, so soon
      clients can start asking by digest of descriptor rather than by
      fingerprint of server.
    - Add half our entropy from RAND_poll in OpenSSL.  This knows how
      to use egd (if present), openbsd weirdness (if present), vms/os2
      weirdness (if we ever port there), and more in the future.

  o Bugfixes on 0.1.0.x:
    - Do round-robin writes of at most 16 kB per write. This might be
      more fair on loaded Tor servers, and it might resolve our Windows
      crash bug. It might also slow things down.
    - Our TLS handshakes were generating a single public/private
      keypair for the TLS context, rather than making a new one for
      each new connections. Oops. (But we were still rotating them
      periodically, so it's not so bad.)
    - When we were cannibalizing a circuit with a particular exit
      node in mind, we weren't checking to see if that exit node was
      already present earlier in the circuit. Oops.
    - When a Tor server's IP changes (e.g. from a dyndns address),
      upload a new descriptor so clients will learn too.
    - Really busy servers were keeping enough circuits open on stable
      connections that they were wrapping around the circuit_id
      space. (It's only two bytes.) This exposed a bug where we would
      feel free to reuse a circuit_id even if it still exists but has
      been marked for close. Try to fix this bug. Some bug remains.
    - If we would close a stream early (e.g. it asks for a .exit that
      we know would refuse it) but the LeaveStreamsUnattached config
      option is set by the controller, then don't close it.

  o Bugfixes on 0.1.1.8-alpha:
    - Fix a big pile of memory leaks, some of them serious.
    - Do not try to download a routerdesc if we would immediately reject
      it as obsolete.
    - Resume inserting a newline between all router descriptors when
      generating (old style) signed directories, since our spec says
      we do.
    - When providing content-type application/octet-stream for
      server descriptors using .z, we were leaving out the
      content-encoding header. Oops. (Everything tolerated this just
      fine, but that doesn't mean we need to be part of the problem.)
    - Fix a potential seg fault in getconf and getinfo using version 1
      of the controller protocol.
    - Avoid crash: do not check whether DirPort is reachable when we
      are suppressing it because of hibernation.
    - Make --hash-password not crash on exit.


Changes in version 0.1.1.8-alpha - 2005-10-07
  o New features (major):
    - Clients don't download or use the directory anymore. Now they
      download and use network-statuses from the trusted dirservers,
      and fetch individual server descriptors as needed from mirrors.
      See dir-spec.txt for all the gory details.
    - Be more conservative about whether to advertise our DirPort.
      The main change is to not advertise if we're running at capacity
      and either a) we could hibernate or b) our capacity is low and
      we're using a default DirPort.
    - Use OpenSSL's AES when OpenSSL has version 0.9.7 or later.

  o New features (minor):
    - Try to be smart about when to retry network-status and
      server-descriptor fetches. Still needs some tuning.
    - Stop parsing, storing, or using running-routers output (but
      mirrors still cache and serve it).
    - Consider a threshold of versioning dirservers (dirservers who have
      an opinion about which Tor versions are still recommended) before
      deciding whether to warn the user that he's obsolete.
    - Dirservers can now reject/invalidate by key and IP, with the
      config options "AuthDirInvalid" and "AuthDirReject". This is
      useful since currently we automatically list servers as running
      and usable even if we know they're jerks.
    - Provide dire warnings to any users who set DirServer; move it out
      of torrc.sample and into torrc.complete.
    - Add MyFamily to torrc.sample in the server section.
    - Add nicknames to the DirServer line, so we can refer to them
      without requiring all our users to memorize their IP addresses.
    - When we get an EOF or a timeout on a directory connection, note
      how many bytes of serverdesc we are dropping. This will help
      us determine whether it is smart to parse incomplete serverdesc
      responses.
    - Add a new function to "change pseudonyms" -- that is, to stop
      using any currently-dirty circuits for new streams, so we don't
      link new actions to old actions. Currently it's only called on
      HUP (or SIGNAL RELOAD).
    - On sighup, if UseHelperNodes changed to 1, use new circuits.
    - Start using RAND_bytes rather than RAND_pseudo_bytes from
      OpenSSL. Also, reseed our entropy every hour, not just at
      startup. And entropy in 512-bit chunks, not 160-bit chunks.

  o Fixes on 0.1.1.7-alpha:
    - Nobody ever implemented EVENT_ADDRMAP for control protocol
      version 0, so don't let version 0 controllers ask for it.
    - If you requested something with too many newlines via the
      v1 controller protocol, you could crash tor.
    - Fix a number of memory leaks, including some pretty serious ones.
    - Re-enable DirPort testing again, so Tor servers will be willing
      to advertise their DirPort if it's reachable.
    - On TLS handshake, only check the other router's nickname against
      its expected nickname if is_named is set.

  o Fixes forward-ported from 0.1.0.15:
    - Don't crash when we don't have any spare file descriptors and we
      try to spawn a dns or cpu worker.
    - Make the numbers in read-history and write-history into uint64s,
      so they don't overflow and publish negatives in the descriptor.

  o Fixes on 0.1.0.x:
    - For the OS X package's modified privoxy config file, comment
      out the "logfile" line so we don't log everything passed
      through privoxy.
    - We were whining about using socks4 or socks5-with-local-lookup
      even when it's an IP in the "virtual" range we designed exactly
      for this case.
    - We were leaking some memory every time the client changes IPs.
    - Never call free() on tor_malloc()d memory. This will help us
      use dmalloc to detect memory leaks.
    - Check for named servers when looking them up by nickname;
      warn when we'recalling a non-named server by its nickname;
      don't warn twice about the same name.
    - Try to list MyFamily elements by key, not by nickname, and warn
      if we've not heard of the server.
    - Make windows platform detection (uname equivalent) smarter.
    - It turns out sparc64 doesn't like unaligned access either.


Changes in version 0.1.0.15 - 2005-09-23
  o Bugfixes on 0.1.0.x:
    - Reject ports 465 and 587 (spam targets) in default exit policy.
    - Don't crash when we don't have any spare file descriptors and we
      try to spawn a dns or cpu worker.
    - Get rid of IgnoreVersion undocumented config option, and make us
      only warn, never exit, when we're running an obsolete version.
    - Don't try to print a null string when your server finds itself to
      be unreachable and the Address config option is empty.
    - Make the numbers in read-history and write-history into uint64s,
      so they don't overflow and publish negatives in the descriptor.
    - Fix a minor memory leak in smartlist_string_remove().
    - We were only allowing ourselves to upload a server descriptor at
      most every 20 minutes, even if it changed earlier than that.
    - Clean up log entries that pointed to old URLs.


Changes in version 0.1.1.7-alpha - 2005-09-14
  o Fixes on 0.1.1.6-alpha:
    - Exit servers were crashing when people asked them to make a
      connection to an address not in their exit policy.
    - Looking up a non-existent stream for a v1 control connection would
      cause a segfault.
    - Fix a seg fault if we ask a dirserver for a descriptor by
      fingerprint but he doesn't know about him.
    - SETCONF was appending items to linelists, not clearing them.
    - SETCONF SocksBindAddress killed Tor if it fails to bind. Now back
      out and refuse the setconf if it would fail.
    - Downgrade the dirserver log messages when whining about
      unreachability.

  o New features:
    - Add Peter Palfrader's check-tor script to tor/contrib/
      It lets you easily check whether a given server (referenced by
      nickname) is reachable by you.
    - Numerous changes to move towards client-side v2 directories. Not
      enabled yet.

  o Fixes on 0.1.0.x:
    - If the user gave tor an odd number of command-line arguments,
      we were silently ignoring the last one. Now we complain and fail.
      [This wins the oldest-bug prize -- this bug has been present since
       November 2002, as released in Tor 0.0.0.]
    - Do not use unaligned memory access on alpha, mips, or mipsel.
      It *works*, but is very slow, so we treat them as if it doesn't.
    - Retry directory requests if we fail to get an answer we like
      from a given dirserver (we were retrying before, but only if
      we fail to connect).
    - When writing the RecommendedVersions line, sort them first.
    - When the client asked for a rendezvous port that the hidden
      service didn't want to provide, we were sending an IP address
      back along with the end cell. Fortunately, it was zero. But stop
      that anyway.
    - Correct "your server is reachable" log entries to indicate that
      it was self-testing that told us so.


Changes in version 0.1.1.6-alpha - 2005-09-09
  o Fixes on 0.1.1.5-alpha:
    - We broke fascistfirewall in 0.1.1.5-alpha. Oops.
    - Fix segfault in unit tests in 0.1.1.5-alpha. Oops.
    - Fix bug with tor_memmem finding a match at the end of the string.
    - Make unit tests run without segfaulting.
    - Resolve some solaris x86 compile warnings.
    - Handle duplicate lines in approved-routers files without warning.
    - Fix bug where as soon as a server refused any requests due to his
      exit policy (e.g. when we ask for localhost and he tells us that's
      127.0.0.1 and he won't do it), we decided he wasn't obeying his
      exit policy using him for any exits.
    - Only do openssl hardware accelerator stuff if openssl version is
      at least 0.9.7.

  o New controller features/fixes:
    - Add a "RESETCONF" command so you can set config options like
      AllowUnverifiedNodes and LongLivedPorts to "". Also, if you give
      a config option in the torrc with no value, then it clears it
      entirely (rather than setting it to its default).
    - Add a "GETINFO config-file" to tell us where torrc is.
    - Avoid sending blank lines when GETINFO replies should be empty.
    - Add a QUIT command for the controller (for using it manually).
    - Fix a bug in SAVECONF that was adding default dirservers and
      other redundant entries to the torrc file.

  o Start on the new directory design:
    - Generate, publish, cache, serve new network-status format.
    - Publish individual descriptors (by fingerprint, by "all", and by
      "tell me yours").
    - Publish client and server recommended versions separately.
    - Allow tor_gzip_uncompress() to handle multiple concatenated
      compressed strings. Serve compressed groups of router
      descriptors. The compression logic here could be more
      memory-efficient.
    - Distinguish v1 authorities (all currently trusted directories)
      from v2 authorities (all trusted directories).
    - Change DirServers config line to note which dirs are v1 authorities.
    - Add configuration option "V1AuthoritativeDirectory 1" which
      moria1, moria2, and tor26 should set.
    - Remove option when getting directory cache to see whether they
      support running-routers; they all do now. Replace it with one
      to see whether caches support v2 stuff.

  o New features:
    - Dirservers now do their own external reachability testing of each
      Tor server, and only list them as running if they've been found to
      be reachable. We also send back warnings to the server's logs if
      it uploads a descriptor that we already believe is unreachable.
    - Implement exit enclaves: if we know an IP address for the
      destination, and there's a running Tor server at that address
      which allows exit to the destination, then extend the circuit to
      that exit first. This provides end-to-end encryption and end-to-end
      authentication. Also, if the user wants a .exit address or enclave,
      use 4 hops rather than 3, and cannibalize a general circ for it
      if you can.
    - Permit transitioning from ORPort=0 to ORPort!=0, and back, from the
      controller. Also, rotate dns and cpu workers if the controller
      changes options that will affect them; and initialize the dns
      worker cache tree whether or not we start out as a server.
    - Only upload a new server descriptor when options change, 18
      hours have passed, uptime is reset, or bandwidth changes a lot.
    - Check [X-]Forwarded-For headers in HTTP requests when generating
      log messages. This lets people run dirservers (and caches) behind
      Apache but still know which IP addresses are causing warnings.

  o Config option changes:
    - Replace (Fascist)Firewall* config options with a new
      ReachableAddresses option that understands address policies.
      For example, "ReachableAddresses *:80,*:443"
    - Get rid of IgnoreVersion undocumented config option, and make us
      only warn, never exit, when we're running an obsolete version.
    - Make MonthlyAccountingStart config option truly obsolete now.

  o Fixes on 0.1.0.x:
    - Reject ports 465 and 587 in the default exit policy, since
      people have started using them for spam too.
    - It turns out we couldn't bootstrap a network since we added
      reachability detection in 0.1.0.1-rc. Good thing the Tor network
      has never gone down. Add an AssumeReachable config option to let
      servers and dirservers bootstrap. When we're trying to build a
      high-uptime or high-bandwidth circuit but there aren't enough
      suitable servers, try being less picky rather than simply failing.
    - Our logic to decide if the OR we connected to was the right guy
      was brittle and maybe open to a mitm for unverified routers.
    - We weren't cannibalizing circuits correctly for
      CIRCUIT_PURPOSE_C_ESTABLISH_REND and
      CIRCUIT_PURPOSE_S_ESTABLISH_INTRO, so we were being forced to
      build those from scratch. This should make hidden services faster.
    - Predict required circuits better, with an eye toward making hidden
      services faster on the service end.
    - Retry streams if the exit node sends back a 'misc' failure. This
      should result in fewer random failures. Also, after failing
      from resolve failed or misc, reset the num failures, so we give
      it a fair shake next time we try.
    - Clean up the rendezvous warn log msgs, and downgrade some to info.
    - Reduce severity on logs about dns worker spawning and culling.
    - When we're shutting down and we do something like try to post a
      server descriptor or rendezvous descriptor, don't complain that
      we seem to be unreachable. Of course we are, we're shutting down.
    - Add TTLs to RESOLVED, CONNECTED, and END_REASON_EXITPOLICY cells.
      We don't use them yet, but maybe one day our DNS resolver will be
      able to discover them.
    - Make ContactInfo mandatory for authoritative directory servers.
    - Require server descriptors to list IPv4 addresses -- hostnames
      are no longer allowed. This also fixes some potential security
      problems with people providing hostnames as their address and then
      preferentially resolving them to partition users.
    - Change log line for unreachability to explicitly suggest /etc/hosts
      as the culprit. Also make it clearer what IP address and ports we're
      testing for reachability.
    - Put quotes around user-supplied strings when logging so users are
      more likely to realize if they add bad characters (like quotes)
      to the torrc.
    - Let auth dir servers start without specifying an Address config
      option.
    - Make unit tests (and other invocations that aren't the real Tor)
      run without launching listeners, creating subdirectories, and so on.


Changes in version 0.1.1.5-alpha - 2005-08-08
  o Bugfixes included in 0.1.0.14.

  o Bugfixes on 0.1.0.x:
    - If you write "HiddenServicePort 6667 127.0.0.1 6668" in your
      torrc rather than "HiddenServicePort 6667 127.0.0.1:6668",
      it would silently using ignore the 6668.


Changes in version 0.1.0.14 - 2005-08-08
  o Bugfixes on 0.1.0.x:
      - Fix the other half of the bug with crypto handshakes
        (CVE-2005-2643).
      - Fix an assert trigger if you send a 'signal term' via the
        controller when it's listening for 'event info' messages.


Changes in version 0.1.1.4-alpha - 2005-08-04
  o Bugfixes included in 0.1.0.13.

  o Features:
    - Improve tor_gettimeofday() granularity on windows.
    - Make clients regenerate their keys when their IP address changes.
    - Implement some more GETINFO goodness: expose helper nodes, config
      options, getinfo keys.


Changes in version 0.1.0.13 - 2005-08-04
  o Bugfixes on 0.1.0.x:
    - Fix a critical bug in the security of our crypto handshakes.
    - Fix a size_t underflow in smartlist_join_strings2() that made
      it do bad things when you hand it an empty smartlist.
    - Fix Windows installer to ship Tor license (thanks to Aphex for
      pointing out this oversight) and put a link to the doc directory
      in the start menu.
    - Explicitly set no-unaligned-access for sparc: it turns out the
      new gcc's let you compile broken code, but that doesn't make it
      not-broken.


Changes in version 0.1.1.3-alpha - 2005-07-23
  o Bugfixes on 0.1.1.2-alpha:
    - Fix a bug in handling the controller's "post descriptor"
      function.
    - Fix several bugs in handling the controller's "extend circuit"
      function.
    - Fix a bug in handling the controller's "stream status" event.
    - Fix an assert failure if we have a controller listening for
      circuit events and we go offline.
    - Re-allow hidden service descriptors to publish 0 intro points.
    - Fix a crash when generating your hidden service descriptor if
      you don't have enough intro points already.

  o New features on 0.1.1.2-alpha:
    - New controller function "getinfo accounting", to ask how
      many bytes we've used in this time period.
    - Experimental support for helper nodes: a lot of the risk from
      a small static adversary comes because users pick new random
      nodes every time they rebuild a circuit. Now users will try to
      stick to the same small set of entry nodes if they can. Not
      enabled by default yet.

  o Bugfixes on 0.1.0.12:
    - If you're an auth dir server, always publish your dirport,
      even if you haven't yet found yourself to be reachable.
    - Fix a size_t underflow in smartlist_join_strings2() that made
      it do bad things when you hand it an empty smartlist.


Changes in version 0.1.0.12 - 2005-07-18
  o New directory servers:
      - tor26 has changed IP address.

  o Bugfixes on 0.1.0.x:
    - Fix a possible double-free in tor_gzip_uncompress().
    - When --disable-threads is set, do not search for or link against
      pthreads libraries.
    - Don't trigger an assert if an authoritative directory server
      claims its dirport is 0.
    - Fix bug with removing Tor as an NT service: some people were
      getting "The service did not return an error." Thanks to Matt
      Edman for the fix.


Changes in version 0.1.1.2-alpha - 2005-07-15
  o New directory servers:
    - tor26 has changed IP address.

  o Bugfixes on 0.1.0.x, crashes/leaks:
    - Port the servers-not-obeying-their-exit-policies fix from
      0.1.0.11.
    - Fix an fd leak in start_daemon().
    - On Windows, you can't always reopen a port right after you've
      closed it. So change retry_listeners() to only close and re-open
      ports that have changed.
    - Fix a possible double-free in tor_gzip_uncompress().

  o Bugfixes on 0.1.0.x, usability:
    - When tor_socketpair() fails in Windows, give a reasonable
      Windows-style errno back.
    - Let people type "tor --install" as well as "tor -install" when
      they
      want to make it an NT service.
    - NT service patch from Matt Edman to improve error messages.
    - When the controller asks for a config option with an abbreviated
      name, give the full name in our response.
    - Correct the man page entry on TrackHostExitsExpire.
    - Looks like we were never delivering deflated (i.e. compressed)
      running-routers lists, even when asked. Oops.
    - When --disable-threads is set, do not search for or link against
      pthreads libraries.

  o Bugfixes on 0.1.1.x:
    - Fix a seg fault with autodetecting which controller version is
      being used.

  o Features:
    - New hidden service descriptor format: put a version in it, and
      let people specify introduction/rendezvous points that aren't
      in "the directory" (which is subjective anyway).
    - Allow the DEBUG controller event to work again. Mark certain log
      entries as "don't tell this to controllers", so we avoid cycles.


Changes in version 0.1.0.11 - 2005-06-30
  o Bugfixes on 0.1.0.x:
    - Fix major security bug: servers were disregarding their
      exit policies if clients behaved unexpectedly.
    - Make OS X init script check for missing argument, so we don't
      confuse users who invoke it incorrectly.
    - Fix a seg fault in "tor --hash-password foo".
    - The MAPADDRESS control command was broken.


Changes in version 0.1.1.1-alpha - 2005-06-29
  o Bugfixes:
    - Make OS X init script check for missing argument, so we don't
      confuse users who invoke it incorrectly.
    - Fix a seg fault in "tor --hash-password foo".
    - Fix a possible way to DoS dirservers.
    - When we complain that your exit policy implicitly allows local or
      private address spaces, name them explicitly so operators can
      fix it.
    - Make the log message less scary when all the dirservers are
      temporarily unreachable.
    - We were printing the number of idle dns workers incorrectly when
      culling them.

  o Features:
    - Revised controller protocol (version 1) that uses ascii rather
      than binary. Add supporting libraries in python and java so you
      can use the controller from your applications without caring how
      our protocol works.
    - Spiffy new support for crypto hardware accelerators. Can somebody
      test this?


Changes in version 0.0.9.10 - 2005-06-16
  o Bugfixes on 0.0.9.x (backported from 0.1.0.10):
    - Refuse relay cells that claim to have a length larger than the
      maximum allowed. This prevents a potential attack that could read
      arbitrary memory (e.g. keys) from an exit server's process
      (CVE-2005-2050).


Changes in version 0.1.0.10 - 2005-06-14
  o Allow a few EINVALs from libevent before dying. Warn on kqueue with
    libevent before 1.1a.


Changes in version 0.1.0.9-rc - 2005-06-09
  o Bugfixes:
    - Reset buf->highwater every time buf_shrink() is called, not just on
      a successful shrink. This was causing significant memory bloat.
    - Fix buffer overflow when checking hashed passwords.
    - Security fix: if seeding the RNG on Win32 fails, quit.
    - Allow seeding the RNG on Win32 even when you're not running as
      Administrator.
    - Disable threading on Solaris too. Something is wonky with it,
      cpuworkers, and reentrant libs.
    - Reenable the part of the code that tries to flush as soon as an
      OR outbuf has a full TLS record available. Perhaps this will make
      OR outbufs not grow as huge except in rare cases, thus saving lots
      of CPU time plus memory.
    - Reject malformed .onion addresses rather then passing them on as
      normal web requests.
    - Adapt patch from Adam Langley: fix possible memory leak in
      tor_lookup_hostname().
    - Initialize libevent later in the startup process, so the logs are
      already established by the time we start logging libevent warns.
    - Use correct errno on win32 if libevent fails.
    - Check and warn about known-bad/slow libevent versions.
    - Pay more attention to the ClientOnly config option.
    - Have torctl.in/tor.sh.in check for location of su binary (needed
      on FreeBSD)
    - Correct/add man page entries for LongLivedPorts, ExitPolicy,
      KeepalivePeriod, ClientOnly, NoPublish, HttpProxy, HttpsProxy,
      HttpProxyAuthenticator
    - Stop warning about sigpipes in the logs. We're going to
      pretend that getting these occassionally is normal and fine.
    - Resolve OS X installer bugs: stop claiming to be 0.0.9.2 in
      certain
      installer screens; and don't put stuff into StartupItems unless
      the user asks you to.
    - Require servers that use the default dirservers to have public IP
      addresses. We have too many servers that are configured with private
      IPs and their admins never notice the log entries complaining that
      their descriptors are being rejected.
    - Add OSX uninstall instructions. An actual uninstall script will
      come later.


Changes in version 0.1.0.8-rc - 2005-05-23
  o Bugfixes:
    - It turns out that kqueue on OS X 10.3.9 was causing kernel
      panics. Disable kqueue on all OS X Tors.
    - Fix RPM: remove duplicate line accidentally added to the rpm
      spec file.
    - Disable threads on openbsd too, since its gethostaddr is not
      reentrant either.
    - Tolerate libevent 0.8 since it still works, even though it's
      ancient.
    - Enable building on Red Hat 9.0 again.
    - Allow the middle hop of the testing circuit to be running any
      version, now that most of them have the bugfix to let them connect
      to unknown servers. This will allow reachability testing to work
      even when 0.0.9.7-0.0.9.9 become obsolete.
    - Handle relay cells with rh.length too large. This prevents
      a potential attack that could read arbitrary memory (maybe even
      keys) from the exit server's process.
    - We screwed up the dirport reachability testing when we don't yet
      have a cached version of the directory. Hopefully now fixed.
    - Clean up router_load_single_router() (used by the controller),
      so it doesn't seg fault on error.
    - Fix a minor memory leak when somebody establishes an introduction
      point at your Tor server.
    - If a socks connection ends because read fails, don't warn that
      you're not sending a socks reply back.

  o Features:
    - Add HttpProxyAuthenticator config option too, that works like
      the HttpsProxyAuthenticator config option.
    - Encode hashed controller passwords in hex instead of base64,
      to make it easier to write controllers.


Changes in version 0.1.0.7-rc - 2005-05-17
  o Bugfixes:
    - Fix a bug in the OS X package installer that prevented it from
      installing on Tiger.
    - Fix a script bug in the OS X package installer that made it
      complain during installation.
    - Find libevent even if it's hiding in /usr/local/ and your
      CFLAGS and LDFLAGS don't tell you to look there.
    - Be able to link with libevent as a shared library (the default
      after 1.0d), even if it's hiding in /usr/local/lib and even
      if you haven't added /usr/local/lib to your /etc/ld.so.conf,
      assuming you're running gcc. Otherwise fail and give a useful
      error message.
    - Fix a bug in the RPM packager: set home directory for _tor to
      something more reasonable when first installing.
    - Free a minor amount of memory that is still reachable on exit.


Changes in version 0.1.0.6-rc - 2005-05-14
  o Bugfixes:
    - Implement --disable-threads configure option. Disable threads on
      netbsd by default, because it appears to have no reentrant resolver
      functions.
    - Apple's OS X 10.4.0 ships with a broken kqueue. The new libevent
      release (1.1) detects and disables kqueue if it's broken.
    - Append default exit policy before checking for implicit internal
      addresses. Now we don't log a bunch of complaints on startup
      when using the default exit policy.
    - Some people were putting "Address  " in their torrc, and they had
      a buggy resolver that resolved " " to 0.0.0.0. Oops.
    - If DataDir is ~/.tor, and that expands to /.tor, then default to
      LOCALSTATEDIR/tor instead.
    - Fix fragmented-message bug in TorControl.py.
    - Resolve a minor bug which would prevent unreachable dirports
      from getting suppressed in the published descriptor.
    - When the controller gave us a new descriptor, we weren't resolving
      it immediately, so Tor would think its address was 0.0.0.0 until
      we fetched a new directory.
    - Fix an uppercase/lowercase case error in suppressing a bogus
      libevent warning on some Linuxes.

  o Features:
    - Begin scrubbing sensitive strings from logs by default. Turn off
      the config option SafeLogging if you need to do debugging.
    - Switch to a new buffer management algorithm, which tries to avoid
      reallocing and copying quite as much. In first tests it looks like
      it uses *more* memory on average, but less cpu.
    - First cut at support for "create-fast" cells. Clients can use
      these when extending to their first hop, since the TLS already
      provides forward secrecy and authentication. Not enabled on
      clients yet.
    - When dirservers refuse a router descriptor, we now log its
      contactinfo, platform, and the poster's IP address.
    - Call tor_free_all instead of connections_free_all after forking, to
      save memory on systems that need to fork.
    - Whine at you if you're a server and you don't set your contactinfo.
    - Implement --verify-config command-line option to check if your torrc
      is valid without actually launching Tor.
    - Rewrite address "serifos.exit" to "localhost.serifos.exit"
      rather than just rejecting it.


Changes in version 0.1.0.5-rc - 2005-04-27
  o Bugfixes:
    - Stop trying to print a null pointer if an OR conn fails because
      we didn't like its cert.
  o Features:
    - Switch our internal buffers implementation to use a ring buffer,
      to hopefully improve performance for fast servers a lot.
    - Add HttpsProxyAuthenticator support (basic auth only), based
      on patch from Adam Langley.
    - Bump the default BandwidthRate from 1 MB to 2 MB, to accommodate
      the fast servers that have been joining lately.
    - Give hidden service accesses extra time on the first attempt,
      since 60 seconds is often only barely enough. This might improve
      robustness more.
    - Improve performance for dirservers: stop re-parsing the whole
      directory every time you regenerate it.
    - Add more debugging info to help us find the weird dns freebsd
      pthreads bug; cleaner debug messages to help track future issues.


Changes in version 0.0.9.9 - 2005-04-23
  o Bugfixes on 0.0.9.x:
    - If unofficial Tor clients connect and send weird TLS certs, our
      Tor server triggers an assert. This release contains a minimal
      backport from the broader fix that we put into 0.1.0.4-rc.


Changes in version 0.1.0.4-rc - 2005-04-23
  o Bugfixes:
    - If unofficial Tor clients connect and send weird TLS certs, our
      Tor server triggers an assert. Stop asserting, and start handling
      TLS errors better in other situations too.
    - When the controller asks us to tell it about all the debug-level
      logs, it turns out we were generating debug-level logs while
      telling it about them, which turns into a bad loop. Now keep
      track of whether you're sending a debug log to the controller,
      and don't log when you are.
    - Fix the "postdescriptor" feature of the controller interface: on
      non-complete success, only say "done" once.
  o Features:
    - Clients are now willing to load balance over up to 2mB, not 1mB,
      of advertised bandwidth capacity.
    - Add a NoPublish config option, so you can be a server (e.g. for
      testing running Tor servers in other Tor networks) without
      publishing your descriptor to the primary dirservers.


Changes in version 0.1.0.3-rc - 2005-04-08
  o Improvements on 0.1.0.2-rc:
    - Client now retries when streams end early for 'hibernating' or
      'resource limit' reasons, rather than failing them.
    - More automated handling for dirserver operators:
      - Automatically approve nodes running 0.1.0.2-rc or later,
        now that the the reachability detection stuff is working.
      - Now we allow two unverified servers with the same nickname
        but different keys. But if a nickname is verified, only that
        nickname+key are allowed.
      - If you're an authdirserver connecting to an address:port,
        and it's not the OR you were expecting, forget about that
        descriptor. If he *was* the one you were expecting, then forget
        about all other descriptors for that address:port.
      - Allow servers to publish descriptors from 12 hours in the future.
        Corollary: only whine about clock skew from the dirserver if
        he's a trusted dirserver (since now even verified servers could
        have quite wrong clocks).
    - Adjust maximum skew and age for rendezvous descriptors: let skew
      be 48 hours rather than 90 minutes.
    - Efficiency improvements:
      - Keep a big splay tree of (circid,orconn)->circuit mappings to make
        it much faster to look up a circuit for each relay cell.
      - Remove most calls to assert_all_pending_dns_resolves_ok(),
        since they're eating our cpu on exit nodes.
      - Stop wasting time doing a case insensitive comparison for every
        dns name every time we do any lookup. Canonicalize the names to
        lowercase and be done with it.
    - Start sending 'truncated' cells back rather than destroy cells,
      if the circuit closes in front of you. This means we won't have
      to abandon partially built circuits.
    - Only warn once per nickname from add_nickname_list_to_smartlist
      per failure, so an entrynode or exitnode choice that's down won't
      yell so much.
    - Put a note in the torrc about abuse potential with the default
      exit policy.
    - Revise control spec and implementation to allow all log messages to
      be sent to controller with their severities intact (suggested by
      Matt Edman). Update TorControl to handle new log event types.
    - Provide better explanation messages when controller's POSTDESCRIPTOR
      fails.
    - Stop putting nodename in the Platform string in server descriptors.
      It doesn't actually help, and it is confusing/upsetting some people.

  o Bugfixes on 0.1.0.2-rc:
    - We were printing the host mask wrong in exit policies in server
      descriptors. This isn't a critical bug though, since we were still
      obeying the exit policy internally.
    - Fix Tor when compiled with libevent but without pthreads: move
      connection_unregister() from _connection_free() to
      connection_free().
    - Fix an assert trigger (already fixed in 0.0.9.x): when we have
      the rare mysterious case of accepting a conn on 0.0.0.0:0, then
      when we look through the connection array, we'll find any of the
      cpu/dnsworkers. This is no good.

  o Bugfixes on 0.0.9.8:
    - Fix possible bug on threading platforms (e.g. win32) which was
      leaking a file descriptor whenever a cpuworker or dnsworker died.
    - When using preferred entry or exit nodes, ignore whether the
      circuit wants uptime or capacity. They asked for the nodes, they
      get the nodes.
    - chdir() to your datadirectory at the *end* of the daemonize process,
      not the beginning. This was a problem because the first time you
      run tor, if your datadir isn't there, and you have runasdaemon set
      to 1, it will try to chdir to it before it tries to create it. Oops.
    - Handle changed router status correctly when dirserver reloads
      fingerprint file. We used to be dropping all unverified descriptors
      right then. The bug was hidden because we would immediately
      fetch a directory from another dirserver, which would include the
      descriptors we just dropped.
    - When we're connecting to an OR and he's got a different nickname/key
      than we were expecting, only complain loudly if we're an OP or a
      dirserver. Complaining loudly to the OR admins just confuses them.
    - Tie MAX_DIR_SIZE to MAX_BUF_SIZE, so now directory sizes won't get
      artificially capped at 500kB.


Changes in version 0.0.9.8 - 2005-04-07
  o Bugfixes on 0.0.9.x:
    - We have a bug that I haven't found yet. Sometimes, very rarely,
      cpuworkers get stuck in the 'busy' state, even though the cpuworker
      thinks of itself as idle. This meant that no new circuits ever got
      established. Here's a workaround to kill any cpuworker that's been
      busy for more than 100 seconds.


Changes in version 0.1.0.2-rc - 2005-04-01
  o Bugfixes on 0.1.0.1-rc:
    - Fixes on reachability detection:
      - Don't check for reachability while hibernating.
      - If ORPort is reachable but DirPort isn't, still publish the
        descriptor, but zero out DirPort until it's found reachable.
      - When building testing circs for ORPort testing, use only
        high-bandwidth nodes, so fewer circuits fail.
      - Complain about unreachable ORPort separately from unreachable
        DirPort, so the user knows what's going on.
      - Make sure we only conclude ORPort reachability if we didn't
        initiate the conn. Otherwise we could falsely conclude that
        we're reachable just because we connected to the guy earlier
        and he used that same pipe to extend to us.
      - Authdirservers shouldn't do ORPort reachability detection,
        since they're in clique mode, so it will be rare to find a
        server not already connected to them.
      - When building testing circuits, always pick middle hops running
        Tor 0.0.9.7, so we avoid the "can't extend to unknown routers"
        bug. (This is a kludge; it will go away when 0.0.9.x becomes
        obsolete.)
      - When we decide we're reachable, actually publish our descriptor
        right then.
    - Fix bug in redirectstream in the controller.
    - Fix the state descriptor strings so logs don't claim edge streams
      are in a different state than they actually are.
    - Use recent libevent features when possible (this only really affects
      win32 and osx right now, because the new libevent with these
      features hasn't been released yet). Add code to suppress spurious
      libevent log msgs.
    - Prevent possible segfault in connection_close_unattached_ap().
    - Fix newlines on torrc in win32.
    - Improve error msgs when tor-resolve fails.

  o Improvements on 0.0.9.x:
    - New experimental script tor/contrib/ExerciseServer.py (needs more
      work) that uses the controller interface to build circuits and
      fetch pages over them. This will help us bootstrap servers that
      have lots of capacity but haven't noticed it yet.
    - New experimental script tor/contrib/PathDemo.py (needs more work)
      that uses the controller interface to let you choose whole paths
      via addresses like
      "<hostname>.<path,separated by dots>.<length of path>.path"
    - When we've connected to an OR and handshaked but didn't like
      the result, we were closing the conn without sending destroy
      cells back for pending circuits. Now send those destroys.


Changes in version 0.0.9.7 - 2005-04-01
  o Bugfixes on 0.0.9.x:
    - Fix another race crash bug (thanks to Glenn Fink for reporting).
    - Compare identity to identity, not to nickname, when extending to
      a router not already in the directory. This was preventing us from
      extending to unknown routers. Oops.
    - Make sure to create OS X Tor user in <500 range, so we aren't
      creating actual system users.
    - Note where connection-that-hasn't-sent-end was marked, and fix
      a few really loud instances of this harmless bug (it's fixed more
      in 0.1.0.x).


Changes in version 0.1.0.1-rc - 2005-03-28
  o New features:
    - Add reachability testing. Your Tor server will automatically try
      to see if its ORPort and DirPort are reachable from the outside,
      and it won't upload its descriptor until it decides they are.
    - Handle unavailable hidden services better. Handle slow or busy
      hidden services better.
    - Add support for CONNECTing through https proxies, with "HttpsProxy"
      config option.
    - New exit policy: accept most low-numbered ports, rather than
      rejecting most low-numbered ports.
    - More Tor controller support (still experimental). See
      http://tor.eff.org/doc/control-spec.txt for all the new features,
      including signals to emulate unix signals from any platform;
      redirectstream; extendcircuit; mapaddress; getinfo; postdescriptor;
      closestream; closecircuit; etc.
    - Make nt services work and start on startup on win32 (based on
      patch by Matt Edman).
    - Add a new AddressMap config directive to rewrite incoming socks
      addresses. This lets you, for example, declare an implicit
      required exit node for certain sites.
    - Add a new TrackHostExits config directive to trigger addressmaps
      for certain incoming socks addresses -- for sites that break when
      your exit keeps changing (based on patch by Mike Perry).
    - Redo the client-side dns cache so it's just an addressmap too.
    - Notice when our IP changes, and reset stats/uptime/reachability.
    - When an application is using socks5, give him the whole variety of
      potential socks5 responses (connect refused, host unreachable, etc),
      rather than just "success" or "failure".
    - A more sane version numbering system. See
      http://tor.eff.org/cvs/tor/doc/version-spec.txt for details.
    - New contributed script "exitlist": a simple python script to
      parse directories and find Tor nodes that exit to listed
      addresses/ports.
    - New contributed script "privoxy-tor-toggle" to toggle whether
      Privoxy uses Tor. Seems to be configured for Debian by default.
    - Report HTTP reasons to client when getting a response from directory
      servers -- so you can actually know what went wrong.
    - New config option MaxAdvertisedBandwidth which lets you advertise
      a low bandwidthrate (to not attract as many circuits) while still
      allowing a higher bandwidthrate in reality.

  o Robustness/stability fixes:
    - Make Tor use Niels Provos's libevent instead of its current
      poll-but-sometimes-select mess.  This will let us use faster async
      cores (like epoll, kpoll, and /dev/poll), and hopefully work better
      on Windows too.
    - pthread support now too. This was forced because when we forked,
      we ended up wasting a lot of duplicate ram over time. Also switch
      to foo_r versions of some library calls to allow reentry and
      threadsafeness.
    - Better handling for heterogeneous / unreliable nodes:
      - Annotate circuits w/ whether they aim to contain high uptime nodes
        and/or high capacity nodes. When building circuits, choose
        appropriate nodes.
      - This means that every single node in an intro rend circuit,
        not just the last one, will have a minimum uptime.
      - New config option LongLivedPorts to indicate application streams
        that will want high uptime circuits.
      - Servers reset uptime when a dir fetch entirely fails. This
        hopefully reflects stability of the server's network connectivity.
      - If somebody starts his tor server in Jan 2004 and then fixes his
        clock, don't make his published uptime be a year.
      - Reset published uptime when you wake up from hibernation.
    - Introduce a notion of 'internal' circs, which are chosen without
      regard to the exit policy of the last hop. Intro and rendezvous
      circs must be internal circs, to avoid leaking information. Resolve
      and connect streams can use internal circs if they want.
    - New circuit pooling algorithm: make sure to have enough circs around
      to satisfy any predicted ports, and also make sure to have 2 internal
      circs around if we've required internal circs lately (and with high
      uptime if we've seen that lately too).
    - Split NewCircuitPeriod option into NewCircuitPeriod (30 secs),
      which describes how often we retry making new circuits if current
      ones are dirty, and MaxCircuitDirtiness (10 mins), which describes
      how long we're willing to make use of an already-dirty circuit.
    - Cannibalize GENERAL circs to be C_REND, C_INTRO, S_INTRO, and S_REND
      circ as necessary, if there are any completed ones lying around
      when we try to launch one.
    - Make hidden services try to establish a rendezvous for 30 seconds,
      rather than for n (where n=3) attempts to build a circuit.
    - Change SHUTDOWN_WAIT_LENGTH from a fixed 30 secs to a config option
      "ShutdownWaitLength".
    - Try to be more zealous about calling connection_edge_end when
      things go bad with edge conns in connection.c.
    - Revise tor-spec to add more/better stream end reasons.
    - Revise all calls to connection_edge_end to avoid sending "misc",
      and to take errno into account where possible.

  o Bug fixes:
    - Fix a race condition that can trigger an assert, when we have a
      pending create cell and an OR connection fails right then.
    - Fix several double-mark-for-close bugs, e.g. where we were finding
      a conn for a cell even if that conn is already marked for close.
    - Make sequence of log messages when starting on win32 with no config
      file more reasonable.
    - When choosing an exit node for a new non-internal circ, don't take
      into account whether it'll be useful for any pending x.onion
      addresses -- it won't.
    - Turn addr_policy_compare from a tristate to a quadstate; this should
      help address our "Ah, you allow 1.2.3.4:80. You are a good choice
      for google.com" problem.
    - Make "platform" string in descriptor more accurate for Win32 servers,
      so it's not just "unknown platform".
    - Fix an edge case in parsing config options (thanks weasel).
      If they say "--" on the commandline, it's not an option.
    - Reject odd-looking addresses at the client (e.g. addresses that
      contain a colon), rather than having the server drop them because
      they're malformed.
    - tor-resolve requests were ignoring .exit if there was a working circuit
      they could use instead.
    - REUSEADDR on normal platforms means you can rebind to the port
      right after somebody else has let it go. But REUSEADDR on win32
      means to let you bind to the port _even when somebody else
      already has it bound_! So, don't do that on Win32.
    - Change version parsing logic: a version is "obsolete" if it is not
      recommended and (1) there is a newer recommended version in the
      same series, or (2) there are no recommended versions in the same
      series, but there are some recommended versions in a newer series.
      A version is "new" if it is newer than any recommended version in
      the same series.
    - Stop most cases of hanging up on a socks connection without sending
      the socks reject.

  o Helpful fixes:
    - Require BandwidthRate to be at least 20kB/s for servers.
    - When a dirserver causes you to give a warn, mention which dirserver
      it was.
    - New config option DirAllowPrivateAddresses for authdirservers.
      Now by default they refuse router descriptors that have non-IP or
      private-IP addresses.
    - Stop publishing socksport in the directory, since it's not
      actually meant to be public. For compatibility, publish a 0 there
      for now.
    - Change DirFetchPeriod/StatusFetchPeriod to have a special "Be
      smart" value, that is low for servers and high for clients.
    - If our clock jumps forward by 100 seconds or more, assume something
      has gone wrong with our network and abandon all not-yet-used circs.
    - Warn when exit policy implicitly allows local addresses.
    - If we get an incredibly skewed timestamp from a dirserver mirror
      that isn't a verified OR, don't warn -- it's probably him that's
      wrong.
    - Since we ship our own Privoxy on OS X, tweak it so it doesn't write
      cookies to disk and doesn't log each web request to disk. (Thanks
      to Brett Carrington for pointing this out.)
    - When a client asks us for a dir mirror and we don't have one,
      launch an attempt to get a fresh one.
    - If we're hibernating and we get a SIGINT, exit immediately.
    - Add --with-dmalloc ./configure option, to track memory leaks.
    - And try to free all memory on closing, so we can detect what
      we're leaking.
    - Cache local dns resolves correctly even when they're .exit
      addresses.
    - Give a better warning when some other server advertises an
      ORPort that is actually an apache running ssl.
    - Add "opt hibernating 1" to server descriptor to make it clearer
      whether the server is hibernating.


Changes in version 0.0.9.6 - 2005-03-24
  o Bugfixes on 0.0.9.x (crashes and asserts):
    - Add new end stream reasons to maintainance branch. Fix bug where
      reason (8) could trigger an assert.  Prevent bug from recurring.
    - Apparently win32 stat wants paths to not end with a slash.
    - Fix assert triggers in assert_cpath_layer_ok(), where we were
      blowing away the circuit that conn->cpath_layer points to, then
      checking to see if the circ is well-formed. Backport check to make
      sure we dont use the cpath on a closed connection.
    - Prevent circuit_resume_edge_reading_helper() from trying to package
      inbufs for marked-for-close streams.
    - Don't crash on hup if your options->address has become unresolvable.
    - Some systems (like OS X) sometimes accept() a connection and tell
      you the remote host is 0.0.0.0:0. If this happens, due to some
      other mis-features, we get confused; so refuse the conn for now.

  o Bugfixes on 0.0.9.x (other):
    - Fix harmless but scary "Unrecognized content encoding" warn message.
    - Add new stream error reason: TORPROTOCOL reason means "you are not
      speaking a version of Tor I understand; say bye-bye to your stream."
    - Be willing to cache directories from up to ROUTER_MAX_AGE seconds
      into the future, now that we are more tolerant of skew. This
      resolves a bug where a Tor server would refuse to cache a directory
      because all the directories it gets are too far in the future;
      yet the Tor server never logs any complaints about clock skew.
    - Mac packaging magic: make man pages useable, and do not overwrite
      existing torrc files.
    - Make OS X log happily to /var/log/tor/tor.log


Changes in version 0.0.9.5 - 2005-02-22
  o Bugfixes on 0.0.9.x:
    - Fix an assert race at exit nodes when resolve requests fail.
    - Stop picking unverified dir mirrors--it only leads to misery.
    - Patch from Matt Edman to make NT services work better. Service
      support is still not compiled into the executable by default.
    - Patch from Dmitri Bely so the Tor service runs better under
      the win32 SYSTEM account.
    - Make tor-resolve actually work (?) on Win32.
    - Fix a sign bug when getrlimit claims to have 4+ billion
      file descriptors available.
    - Stop refusing to start when bandwidthburst == bandwidthrate.
    - When create cells have been on the onion queue more than five
      seconds, just send back a destroy and take them off the list.


Changes in version 0.0.9.4 - 2005-02-03
  o Bugfixes on 0.0.9:
    - Fix an assert bug that took down most of our servers: when
      a server claims to have 1 GB of bandwidthburst, don't
      freak out.
    - Don't crash as badly if we have spawned the max allowed number
      of dnsworkers, or we're out of file descriptors.
    - Block more file-sharing ports in the default exit policy.
    - MaxConn is now automatically set to the hard limit of max
      file descriptors we're allowed (ulimit -n), minus a few for
      logs, etc.
    - Give a clearer message when servers need to raise their
      ulimit -n when they start running out of file descriptors.
    - SGI Compatibility patches from Jan Schaumann.
    - Tolerate a corrupt cached directory better.
    - When a dirserver hasn't approved your server, list which one.
    - Go into soft hibernation after 95% of the bandwidth is used,
      not 99%. This is especially important for daily hibernators who
      have a small accounting max. Hopefully it will result in fewer
      cut connections when the hard hibernation starts.
    - Load-balance better when using servers that claim more than
      800kB/s of capacity.
    - Make NT services work (experimental, only used if compiled in).


Changes in version 0.0.9.3 - 2005-01-21
  o Bugfixes on 0.0.9:
    - Backport the cpu use fixes from main branch, so busy servers won't
      need as much processor time.
    - Work better when we go offline and then come back, or when we
      run Tor at boot before the network is up. We do this by
      optimistically trying to fetch a new directory whenever an
      application request comes in and we think we're offline -- the
      human is hopefully a good measure of when the network is back.
    - Backport some minimal hidserv bugfixes: keep rend circuits open as
      long as you keep using them; actually publish hidserv descriptors
      shortly after they change, rather than waiting 20-40 minutes.
    - Enable Mac startup script by default.
    - Fix duplicate dns_cancel_pending_resolve reported by Giorgos Pallas.
    - When you update AllowUnverifiedNodes or FirewallPorts via the
      controller's setconf feature, we were always appending, never
      resetting.
    - When you update HiddenServiceDir via setconf, it was screwing up
      the order of reading the lines, making it fail.
    - Do not rewrite a cached directory back to the cache; otherwise we
      will think it is recent and not fetch a newer one on startup.
    - Workaround for webservers that lie about Content-Encoding: Tor
      now tries to autodetect compressed directories and compression
      itself. This lets us Proxypass dir fetches through apache.


Changes in version 0.0.9.2 - 2005-01-04
  o Bugfixes on 0.0.9 (crashes and asserts):
    - Fix an assert on startup when the disk is full and you're logging
      to a file.
    - If you do socks4 with an IP of 0.0.0.x but *don't* provide a socks4a
      style address, then we'd crash.
    - Fix an assert trigger when the running-routers string we get from
      a dirserver is broken.
    - Make worker threads start and run on win32. Now win32 servers
      may work better.
    - Bandaid (not actually fix, but now it doesn't crash) an assert
      where the dns worker dies mysteriously and the main Tor process
      doesn't remember anything about the address it was resolving.

  o Bugfixes on 0.0.9 (Win32):
    - Workaround for brain-damaged __FILE__ handling on MSVC: keep Nick's
      name out of the warning/assert messages.
    - Fix a superficial "unhandled error on read" bug on win32.
    - The win32 installer no longer requires a click-through for our
      license, since our Free Software license grants rights but does not
      take any away.
    - Win32: When connecting to a dirserver fails, try another one
      immediately. (This was already working for non-win32 Tors.)
    - Stop trying to parse $HOME on win32 when hunting for default
      DataDirectory.
    - Make tor-resolve.c work on win32 by calling network_init().

  o Bugfixes on 0.0.9 (other):
    - Make 0.0.9.x build on Solaris again.
    - Due to a fencepost error, we were blowing away the \n when reporting
      confvalue items in the controller. So asking for multiple config
      values at once couldn't work.
    - When listing circuits that are pending on an opening OR connection,
      if we're an OR we were listing circuits that *end* at us as
      being pending on every listener, dns/cpu worker, etc. Stop that.
    - Dirservers were failing to create 'running-routers' or 'directory'
      strings if we had more than some threshold of routers. Fix them so
      they can handle any number of routers.
    - Fix a superficial "Duplicate mark for close" bug.
    - Stop checking for clock skew for OR connections, even for servers.
    - Fix a fencepost error that was chopping off the last letter of any
      nickname that is the maximum allowed nickname length.
    - Update URLs in log messages so they point to the new website.
    - Fix a potential problem in mangling server private keys while
      writing to disk (not triggered yet, as far as we know).
    - Include the licenses for other free software we include in Tor,
      now that we're shipping binary distributions more regularly.


Changes in version 0.0.9.1 - 2004-12-15
  o Bugfixes on 0.0.9:
    - Make hibernation actually work.
    - Make HashedControlPassword config option work.
    - When we're reporting event circuit status to a controller,
      don't use the stream status code.


Changes in version 0.0.9 - 2004-12-12
  o Cleanups:
    - Clean up manpage and torrc.sample file.
    - Clean up severities and text of log warnings.
  o Mistakes:
    - Make servers trigger an assert when they enter hibernation.


Changes in version 0.0.9rc7 - 2004-12-08
  o Bugfixes on 0.0.9rc:
    - Fix a stack-trashing crash when an exit node begins hibernating.
    - Avoid looking at unallocated memory while considering which
      ports we need to build circuits to cover.
    - Stop a sigpipe: when an 'end' cell races with eof from the app,
      we shouldn't hold-open-until-flush if the eof arrived first.
    - Fix a bug with init_cookie_authentication() in the controller.
    - When recommending new-format log lines, if the upper bound is
      LOG_ERR, leave it implicit.

  o Bugfixes on 0.0.8.1:
    - Fix a whole slew of memory leaks.
    - Fix isspace() and friends so they still make Solaris happy
      but also so they don't trigger asserts on win32.
    - Fix parse_iso_time on platforms without strptime (eg win32).
    - win32: tolerate extra "readable" events better.
    - win32: when being multithreaded, leave parent fdarray open.
    - Make unit tests work on win32.


Changes in version 0.0.9rc6 - 2004-12-06
  o Bugfixes on 0.0.9pre:
    - Clean up some more integer underflow opportunities (not exploitable
      we think).
    - While hibernating, hup should not regrow our listeners.
    - Send an end to the streams we close when we hibernate, rather
      than just chopping them off.
    - React to eof immediately on non-open edge connections.

  o Bugfixes on 0.0.8.1:
    - Calculate timeout for waiting for a connected cell from the time
      we sent the begin cell, not from the time the stream started. If
      it took a long time to establish the circuit, we would time out
      right after sending the begin cell.
    - Fix router_compare_addr_to_addr_policy: it was not treating a port
      of * as always matching, so we were picking reject *:* nodes as
      exit nodes too. Oops.

  o Features:
    - New circuit building strategy: keep a list of ports that we've
      used in the past 6 hours, and always try to have 2 circuits open
      or on the way that will handle each such port. Seed us with port
      80 so web users won't complain that Tor is "slow to start up".
    - Make kill -USR1 dump more useful stats about circuits.
    - When warning about retrying or giving up, print the address, so
      the user knows which one it's talking about.
    - If you haven't used a clean circuit in an hour, throw it away,
      just to be on the safe side. (This means after 6 hours a totally
      unused Tor client will have no circuits open.)


Changes in version 0.0.9rc5 - 2004-12-01
  o Bugfixes on 0.0.8.1:
    - Disallow NDEBUG. We don't ever want anybody to turn off debug.
    - Let resolve conns retry/expire also, rather than sticking around
      forever.
    - If we are using select, make sure we stay within FD_SETSIZE.

  o Bugfixes on 0.0.9pre:
    - Fix integer underflow in tor_vsnprintf() that may be exploitable,
      but doesn't seem to be currently; thanks to Ilja van Sprundel for
      finding it.
    - If anybody set DirFetchPostPeriod, give them StatusFetchPeriod
      instead.  Impose minima and maxima for all *Period options; impose
      even tighter maxima for fetching if we are a caching dirserver.
      Clip rather than rejecting.
    - Fetch cached running-routers from servers that serve it (that is,
      authdirservers and servers running 0.0.9rc5-cvs or later.)

  o Features:
    - Accept *:706 (silc) in default exit policy.
    - Implement new versioning format for post 0.1.
    - Support "foo.nickname.exit" addresses, to let Alice request the
      address "foo" as viewed by exit node "nickname". Based on a patch
      by Geoff Goodell.
    - Make tor --version --version dump the cvs Id of every file.


Changes in version 0.0.9rc4 - 2004-11-28
  o Bugfixes on 0.0.8.1:
    - Make windows sockets actually non-blocking (oops), and handle
      win32 socket errors better.

  o Bugfixes on 0.0.9rc1:
    - Actually catch the -USR2 signal.


Changes in version 0.0.9rc3 - 2004-11-25
  o Bugfixes on 0.0.8.1:
    - Flush the log file descriptor after we print "Tor opening log file",
      so we don't see those messages days later.

  o Bugfixes on 0.0.9rc1:
    - Make tor-resolve work again.
    - Avoid infinite loop in tor-resolve if tor hangs up on it.
    - Fix an assert trigger for clients/servers handling resolves.


Changes in version 0.0.9rc2 - 2004-11-24
  o Bugfixes on 0.0.9rc1:
    - I broke socks5 support while fixing the eof bug.
    - Allow unitless bandwidths and intervals; they default to bytes
      and seconds.
    - New servers don't start out hibernating; they are active until
      they run out of bytes, so they have a better estimate of how
      long it takes, and so their operators can know they're working.


Changes in version 0.0.9rc1 - 2004-11-23
  o Bugfixes on 0.0.8.1:
    - Finally fix a bug that's been plaguing us for a year:
      With high load, circuit package window was reaching 0. Whenever
      we got a circuit-level sendme, we were reading a lot on each
      socket, but only writing out a bit. So we would eventually reach
      eof. This would be noticed and acted on even when there were still
      bytes sitting in the inbuf.
    - When poll() is interrupted, we shouldn't believe the revents values.

  o Bugfixes on 0.0.9pre6:
    - Fix hibernate bug that caused pre6 to be broken.
    - Don't keep rephist info for routers that haven't had activity for
      24 hours. (This matters now that clients have keys, since we track
      them too.)
    - Never call close_temp_logs while validating log options.
    - Fix backslash-escaping on tor.sh.in and torctl.in.

  o Features:
    - Implement weekly/monthly/daily accounting: now you specify your
      hibernation properties by
      AccountingMax N bytes|KB|MB|GB|TB
      AccountingStart day|week|month [day] HH:MM
        Defaults to "month 1 0:00".
    - Let bandwidth and interval config options be specified as 5 bytes,
      kb, kilobytes, etc; and as seconds, minutes, hours, days, weeks.
    - kill -USR2 now moves all logs to loglevel debug (kill -HUP to
      get back to normal.)
    - If your requested entry or exit node has advertised bandwidth 0,
      pick it anyway.
    - Be more greedy about filling up relay cells -- we try reading again
      once we've processed the stuff we read, in case enough has arrived
      to fill the last cell completely.
    - Apply NT service patch from Osamu Fujino. Still needs more work.


Changes in version 0.0.9pre6 - 2004-11-15
  o Bugfixes on 0.0.8.1:
    - Fix assert failure on malformed socks4a requests.
    - Use identity comparison, not nickname comparison, to choose which
      half of circuit-ID-space each side gets to use. This is needed
      because sometimes we think of a router as a nickname, and sometimes
      as a hex ID, and we can't predict what the other side will do.
    - Catch and ignore SIGXFSZ signals when log files exceed 2GB; our
      write() call will fail and we handle it there.
    - Add a FAST_SMARTLIST define to optionally inline smartlist_get
      and smartlist_len, which are two major profiling offenders.

  o Bugfixes on 0.0.9pre5:
    - Fix a bug in read_all that was corrupting config files on windows.
    - When we're raising the max number of open file descriptors to
      'unlimited', don't log that we just raised it to '-1'.
    - Include event code with events, as required by control-spec.txt.
    - Don't give a fingerprint when clients do --list-fingerprint:
      it's misleading, because it will never be the same again.
    - Stop using strlcpy in tor_strndup, since it was slowing us
      down a lot.
    - Remove warn on startup about missing cached-directory file.
    - Make kill -USR1 work again.
    - Hibernate if we start tor during the "wait for wakeup-time" phase
      of an accounting interval. Log our hibernation plans better.
    - Authoritative dirservers now also cache their directory, so they
      have it on start-up.

  o Features:
    - Fetch running-routers; cache running-routers; compress
      running-routers; serve compressed running-routers.z
    - Add NSI installer script contributed by J Doe.
    - Commit VC6 and VC7 workspace/project files.
    - Commit a tor.spec for making RPM files, with help from jbash.
    - Add contrib/torctl.in contributed by Glenn Fink.
    - Implement the control-spec's SAVECONF command, to write your
      configuration to torrc.
    - Get cookie authentication for the controller closer to working.
    - Include control-spec.txt in the tarball.
    - When set_conf changes our server descriptor, upload a new copy.
      But don't upload it too often if there are frequent changes.
    - Document authentication config in man page, and document signals
      we catch.
    - Clean up confusing parts of man page and torrc.sample.
    - Make expand_filename handle ~ and ~username.
    - Use autoconf to enable largefile support where necessary. Use
      ftello where available, since ftell can fail at 2GB.
    - Distinguish between TOR_TLS_CLOSE and TOR_TLS_ERROR, so we can
      log more informatively.
    - Give a slightly more useful output for "tor -h".
    - Refuse application socks connections to port 0.
    - Check clock skew for verified servers, but allow unverified
      servers and clients to have any clock skew.
    - Break DirFetchPostPeriod into:
      - DirFetchPeriod for fetching full directory,
      - StatusFetchPeriod for fetching running-routers,
      - DirPostPeriod for posting server descriptor,
      - RendPostPeriod for posting hidden service descriptors.
    - Make sure the hidden service descriptors are at a random offset
      from each other, to hinder linkability.


Changes in version 0.0.9pre5 - 2004-11-09
  o Bugfixes on 0.0.9pre4:
    - Fix a seg fault in unit tests (doesn't affect main program).
    - Fix an assert bug where a hidden service provider would fail if
      the first hop of his rendezvous circuit was down.
    - Hidden service operators now correctly handle version 1 style
      INTRODUCE1 cells (nobody generates them still, so not a critical
      bug).
    - If do_hup fails, actually notice.
    - Handle more errnos from accept() without closing the listener.
      Some OpenBSD machines were closing their listeners because
      they ran out of file descriptors.
    - Send resolve cells to exit routers that are running a new
      enough version of the resolve code to work right.
    - Better handling of winsock includes on non-MSV win32 compilers.
    - Some people had wrapped their tor client/server in a script
      that would restart it whenever it died. This did not play well
      with our "shut down if your version is obsolete" code. Now people
      don't fetch a new directory if their local cached version is
      recent enough.
    - Make our autogen.sh work on ksh as well as bash.

  o Major Features:
    - Hibernation: New config option "AccountingMaxKB" lets you
      set how many KBytes per month you want to allow your server to
      consume. Rather than spreading those bytes out evenly over the
      month, we instead hibernate for some of the month and pop up
      at a deterministic time, work until the bytes are consumed, then
      hibernate again. Config option "MonthlyAccountingStart" lets you
      specify which day of the month your billing cycle starts on.
    - Control interface: a separate program can now talk to your
      client/server over a socket, and get/set config options, receive
      notifications of circuits and streams starting/finishing/dying,
      bandwidth used, etc. The next step is to get some GUIs working.
      Let us know if you want to help out. See doc/control-spec.txt .
    - Ship a contrib/tor-control.py as an example script to interact
      with the control port.
    - "tor --hash-password zzyxz" will output a salted password for
      use in authenticating to the control interface.
    - New log format in config:
      "Log minsev[-maxsev] stdout|stderr|syslog" or
      "Log minsev[-maxsev] file /var/foo"

  o Minor Features:
    - DirPolicy config option, to let people reject incoming addresses
      from their dirserver.
    - "tor --list-fingerprint" will list your identity key fingerprint
      and then exit.
    - Add "pass" target for RedirectExit, to make it easier to break
      out of a sequence of RedirectExit rules.
    - Clients now generate a TLS cert too, in preparation for having
      them act more like real nodes.
    - Ship src/win32/ in the tarball, so people can use it to build.
    - Make old win32 fall back to CWD if SHGetSpecialFolderLocation
      is broken.
    - New "router-status" line in directory, to better bind each verified
      nickname to its identity key.
    - Deprecate unofficial config option abbreviations, and abbreviations
      not on the command line.
    - Add a pure-C tor-resolve implementation.
    - Use getrlimit and friends to ensure we can reach MaxConn (currently
      1024) file descriptors.

  o Code security improvements, inspired by Ilja:
    - Replace sprintf with snprintf. (I think they were all safe, but
      hey.)
    - Replace strcpy/strncpy with strlcpy in more places.
    - Avoid strcat; use snprintf or strlcat instead.
    - snprintf wrapper with consistent (though not C99) overflow behavior.


Changes in version 0.0.9pre4 - 2004-10-17
  o Bugfixes on 0.0.9pre3:
    - If the server doesn't specify an exit policy, use the real default
      exit policy, not reject *:*.
    - Ignore fascistfirewall when uploading/downloading hidden service
      descriptors, since we go through Tor for those; and when using
      an HttpProxy, since we assume it can reach them all.
    - When looking for an authoritative dirserver, use only the ones
      configured at boot. Don't bother looking in the directory.
    - The rest of the fix for get_default_conf_file() on older win32.
    - Make 'Routerfile' config option obsolete.

  o Features:
    - New 'MyFamily nick1,...' config option for a server to
      specify other servers that shouldn't be used in the same circuit
      with it. Only believed if nick1 also specifies us.
    - New 'NodeFamily nick1,nick2,...' config option for a client to
      specify nodes that it doesn't want to use in the same circuit.
    - New 'Redirectexit pattern address:port' config option for a
      server to redirect exit connections, e.g. to a local squid.


Changes in version 0.0.9pre3 - 2004-10-13
  o Bugfixes on 0.0.8.1:
    - Better torrc example lines for dirbindaddress and orbindaddress.
    - Improved bounds checking on parsed ints (e.g. config options and
      the ones we find in directories.)
    - Better handling of size_t vs int, so we're more robust on 64
      bit platforms.
    - Fix the rest of the bug where a newly started OR would appear
      as unverified even after we've added his fingerprint and hupped
      the dirserver.
    - Fix a bug from 0.0.7: when read() failed on a stream, we would
      close it without sending back an end. So 'connection refused'
      would simply be ignored and the user would get no response.

  o Bugfixes on 0.0.9pre2:
    - Serving the cached-on-disk directory to people is bad. We now
      provide no directory until we've fetched a fresh one.
    - Workaround for bug on windows where cached-directories get crlf
      corruption.
    - Make get_default_conf_file() work on older windows too.
    - If we write a *:* exit policy line in the descriptor, don't write
      any more exit policy lines.

  o Features:
    - Use only 0.0.9pre1 and later servers for resolve cells.
    - Make the dirservers file obsolete.
      - Include a dir-signing-key token in directories to tell the
        parsing entity which key is being used to sign.
      - Remove the built-in bulky default dirservers string.
      - New config option "Dirserver %s:%d [fingerprint]", which can be
        repeated as many times as needed. If no dirservers specified,
        default to moria1,moria2,tor26.
    - Make moria2 advertise a dirport of 80, so people behind firewalls
      will be able to get a directory.
    - Http proxy support
      - Dirservers translate requests for http://%s:%d/x to /x
      - You can specify "HttpProxy %s[:%d]" and all dir fetches will
        be routed through this host.
      - Clients ask for /tor/x rather than /x for new enough dirservers.
        This way we can one day coexist peacefully with apache.
      - Clients specify a "Host: %s%d" http header, to be compatible
        with more proxies, and so running squid on an exit node can work.


Changes in version 0.0.8.1 - 2004-10-13
  o Bugfixes:
    - Fix a seg fault that can be triggered remotely for Tor
      clients/servers with an open dirport.
    - Fix a rare assert trigger, where routerinfos for entries in
      our cpath would expire while we're building the path.
    - Fix a bug in OutboundBindAddress so it (hopefully) works.
    - Fix a rare seg fault for people running hidden services on
      intermittent connections.
    - Fix a bug in parsing opt keywords with objects.
    - Fix a stale pointer assert bug when a stream detaches and
      reattaches.
    - Fix a string format vulnerability (probably not exploitable)
      in reporting stats locally.
    - Fix an assert trigger: sometimes launching circuits can fail
      immediately, e.g. because too many circuits have failed recently.
    - Fix a compile warning on 64 bit platforms.


Changes in version 0.0.9pre2 - 2004-10-03
  o Bugfixes:
    - Make fetching a cached directory work for 64-bit platforms too.
    - Make zlib.h a required header, not an optional header.


Changes in version 0.0.9pre1 - 2004-10-01
  o Bugfixes:
    - Stop using separate defaults for no-config-file and
      empty-config-file. Now you have to explicitly turn off SocksPort,
      if you don't want it open.
    - Fix a bug in OutboundBindAddress so it (hopefully) works.
    - Improve man page to mention more of the 0.0.8 features.
    - Fix a rare seg fault for people running hidden services on
      intermittent connections.
    - Change our file IO stuff (especially wrt OpenSSL) so win32 is
      happier.
    - Fix more dns related bugs: send back resolve_failed and end cells
      more reliably when the resolve fails, rather than closing the
      circuit and then trying to send the cell. Also attach dummy resolve
      connections to a circuit *before* calling dns_resolve(), to fix
      a bug where cached answers would never be sent in RESOLVED cells.
    - When we run out of disk space, or other log writing error, don't
      crash. Just stop logging to that log and continue.
    - We were starting to daemonize before we opened our logs, so if
      there were any problems opening logs, we would complain to stderr,
      which wouldn't work, and then mysteriously exit.
    - Fix a rare bug where sometimes a verified OR would connect to us
      before he'd uploaded his descriptor, which would cause us to
      assign conn->nickname as though he's unverified. Now we look through
      the fingerprint list to see if he's there.
    - Fix a rare assert trigger, where routerinfos for entries in
      our cpath would expire while we're building the path.

  o Features:
    - Clients can ask dirservers for /dir.z to get a compressed version
      of the directory. Only works for servers running 0.0.9, of course.
    - Make clients cache directories and use them to seed their router
      lists at startup. This means clients have a datadir again.
    - Configuration infrastructure support for warning on obsolete
      options.
    - Respond to content-encoding headers by trying to uncompress as
      appropriate.
    - Reply with a deflated directory when a client asks for "dir.z".
      We could use allow-encodings instead, but allow-encodings isn't
      specified in HTTP 1.0.
    - Raise the max dns workers from 50 to 100.
    - Discourage people from setting their dirfetchpostperiod more often
      than once per minute.
    - Protect dirservers from overzealous descriptor uploading -- wait
      10 seconds after directory gets dirty, before regenerating.


Changes in version 0.0.8 - 2004-08-25
  o Port it to SunOS 5.9 / Athena


Changes in version 0.0.8rc2 - 2004-08-20
  o Make it compile on cygwin again.
  o When picking unverified routers, skip those with low uptime and/or
    low bandwidth, depending on what properties you care about.


Changes in version 0.0.8rc1 - 2004-08-18
  o Changes from 0.0.7.3:
    - Bugfixes:
      - Fix assert triggers: if the other side returns an address 0.0.0.0,
        don't put it into the client dns cache.
      - If a begin failed due to exit policy, but we believe the IP address
        should have been allowed, switch that router to exitpolicy reject *:*
        until we get our next directory.
    - Features:
      - Clients choose nodes proportional to advertised bandwidth.
      - Avoid using nodes with low uptime as introduction points.
      - Handle servers with dynamic IP addresses: don't replace
        options->Address with the resolved one at startup, and
        detect our address right before we make a routerinfo each time.
      - 'FascistFirewall' option to pick dirservers and ORs on specific
        ports; plus 'FirewallPorts' config option to tell FascistFirewall
        which ports are open. (Defaults to 80,443)
      - Be more aggressive about trying to make circuits when the network
        has changed (e.g. when you unsuspend your laptop).
      - Check for time skew on http headers; report date in response to
        "GET /".
      - If the entrynode config line has only one node, don't pick it as
        an exitnode.
      - Add strict{entry|exit}nodes config options. If set to 1, then
        we refuse to build circuits that don't include the specified entry
        or exit nodes.
      - OutboundBindAddress config option, to bind to a specific
        IP address for outgoing connect()s.
      - End truncated log entries (e.g. directories) with "[truncated]".

  o Patches to 0.0.8preX:
    - Bugfixes:
      - Patches to compile and run on win32 again (maybe)?
      - Fix crash when looking for ~/.torrc with no $HOME set.
      - Fix a race bug in the unit tests.
      - Handle verified/unverified name collisions better when new
        routerinfo's arrive in a directory.
      - Sometimes routers were getting entered into the stats before
        we'd assigned their identity_digest. Oops.
      - Only pick and establish intro points after we've gotten a
        directory.
    - Features:
      - AllowUnverifiedNodes config option to let circuits choose no-name
        routers in entry,middle,exit,introduction,rendezvous positions.
        Allow middle and rendezvous positions by default.
      - Add a man page for tor-resolve.


Changes in version 0.0.7.3 - 2004-08-12
  o Stop dnsworkers from triggering an assert failure when you
    ask them to resolve the host "".


Changes in version 0.0.8pre3 - 2004-08-09
  o Changes from 0.0.7.2:
    - Allow multiple ORs with same nickname in routerlist -- now when
      people give us one identity key for a nickname, then later
      another, we don't constantly complain until the first expires.
    - Remember used bandwidth (both in and out), and publish 15-minute
      snapshots for the past day into our descriptor.
    - You can now fetch $DIRURL/running-routers to get just the
      running-routers line, not the whole descriptor list. (But
      clients don't use this yet.)
    - When people mistakenly use Tor as an http proxy, point them
      at the tor-doc.html rather than the INSTALL.
    - Remove our mostly unused -- and broken -- hex_encode()
      function. Use base16_encode() instead. (Thanks to Timo Lindfors
      for pointing out this bug.)
    - Rotate onion keys every 12 hours, not every 2 hours, so we have
      fewer problems with people using the wrong key.
    - Change the default exit policy to reject the default edonkey,
      kazaa, gnutella ports.
    - Add replace_file() to util.[ch] to handle win32's rename().

  o Changes from 0.0.8preX:
    - Fix two bugs in saving onion keys to disk when rotating, so
      hopefully we'll get fewer people using old onion keys.
    - Fix an assert error that was making SocksPolicy not work.
    - Be willing to expire routers that have an open dirport -- it's
      just the authoritative dirservers we want to not forget.
    - Reject tor-resolve requests for .onion addresses early, so we
      don't build a whole rendezvous circuit and then fail.
    - When you're warning a server that he's unverified, don't cry
      wolf unpredictably.
    - Fix a race condition: don't try to extend onto a connection
      that's still handshaking.
    - For servers in clique mode, require the conn to be open before
      you'll choose it for your path.
    - Fix some cosmetic bugs about duplicate mark-for-close, lack of
      end relay cell, etc.
    - Measure bandwidth capacity over the last 24 hours, not just 12
    - Bugfix: authoritative dirservers were making and signing a new
      directory for each client, rather than reusing the cached one.


Changes in version 0.0.8pre2 - 2004-08-04
  o Changes from 0.0.7.2:
    - Security fixes:
      - Check directory signature _before_ you decide whether you're
        you're running an obsolete version and should exit.
      - Check directory signature _before_ you parse the running-routers
        list to decide who's running or verified.
    - Bugfixes and features:
      - Check return value of fclose while writing to disk, so we don't
        end up with broken files when servers run out of disk space.
      - Log a warning if the user uses an unsafe socks variant, so people
        are more likely to learn about privoxy or socat.
      - Dirservers now include RFC1123-style dates in the HTTP headers,
        which one day we will use to better detect clock skew.

  o Changes from 0.0.8pre1:
    - Make it compile without warnings again on win32.
    - Log a warning if you're running an unverified server, to let you
      know you might want to get it verified.
    - Only pick a default nickname if you plan to be a server.


Changes in version 0.0.8pre1 - 2004-07-23
  o Bugfixes:
    - Made our unit tests compile again on OpenBSD 3.5, and tor
      itself compile again on OpenBSD on a sparc64.
    - We were neglecting milliseconds when logging on win32, so
      everything appeared to happen at the beginning of each second.

  o Protocol changes:
    - 'Extend' relay cell payloads now include the digest of the
      intended next hop's identity key. Now we can verify that we're
      extending to the right router, and also extend to routers we
      hadn't heard of before.

  o Features:
    - Tor nodes can now act as relays (with an advertised ORPort)
      without being manually verified by the dirserver operators.
      - Uploaded descriptors of unverified routers are now accepted
        by the dirservers, and included in the directory.
      - Verified routers are listed by nickname in the running-routers
        list; unverified routers are listed as "$<fingerprint>".
      - We now use hash-of-identity-key in most places rather than
        nickname or addr:port, for improved security/flexibility.
      - To avoid Sybil attacks, paths still use only verified servers.
        But now we have a chance to play around with hybrid approaches.
      - Nodes track bandwidth usage to estimate capacity (not used yet).
      - ClientOnly option for nodes that never want to become servers.
    - Directory caching.
      - "AuthoritativeDir 1" option for the official dirservers.
      - Now other nodes (clients and servers) will cache the latest
        directory they've pulled down.
      - They can enable their DirPort to serve it to others.
      - Clients will pull down a directory from any node with an open
        DirPort, and check the signature/timestamp correctly.
      - Authoritative dirservers now fetch directories from other
        authdirservers, to stay better synced.
      - Running-routers list tells who's down also, along with noting
        if they're verified (listed by nickname) or unverified (listed
        by hash-of-key).
      - Allow dirservers to serve running-router list separately.
        This isn't used yet.
    - ORs connect-on-demand to other ORs
      - If you get an extend cell to an OR you're not connected to,
        connect, handshake, and forward the create cell.
      - The authoritative dirservers stay connected to everybody,
        and everybody stays connected to 0.0.7 servers, but otherwise
        clients/servers expire unused connections after 5 minutes.
    - When servers get a sigint, they delay 30 seconds (refusing new
      connections) then exit. A second sigint causes immediate exit.
    - File and name management:
      - Look for .torrc if no CONFDIR "torrc" is found.
      - If no datadir is defined, then choose, make, and secure ~/.tor
        as datadir.
      - If torrc not found, exitpolicy reject *:*.
      - Expands ~/ in filenames to $HOME/ (but doesn't yet expand ~arma).
      - If no nickname is defined, derive default from hostname.
      - Rename secret key files, e.g. identity.key -> secret_id_key,
        to discourage people from mailing their identity key to tor-ops.
    - Refuse to build a circuit before the directory has arrived --
      it won't work anyway, since you won't know the right onion keys
      to use.
    - Try other dirservers immediately if the one you try is down. This
      should tolerate down dirservers better now.
    - Parse tor version numbers so we can do an is-newer-than check
      rather than an is-in-the-list check.
    - New socks command 'resolve', to let us shim gethostbyname()
      locally.
      - A 'tor_resolve' script to access the socks resolve functionality.
      - A new socks-extensions.txt doc file to describe our
        interpretation and extensions to the socks protocols.
    - Add a ContactInfo option, which gets published in descriptor.
    - Publish OR uptime in descriptor (and thus in directory) too.
    - Write tor version at the top of each log file
    - New docs in the tarball:
      - tor-doc.html.
      - Document that you should proxy your SSL traffic too.


Changes in version 0.0.7.2 - 2004-07-07
  o A better fix for the 0.0.0.0 problem, that will hopefully
    eliminate the remaining related assertion failures.


Changes in version 0.0.7.1 - 2004-07-04
  o When an address resolves to 0.0.0.0, treat it as a failed resolve,
    since internally we use 0.0.0.0 to signify "not yet resolved".


Changes in version 0.0.7 - 2004-06-07
  o Updated the man page to reflect the new features.


Changes in version 0.0.7rc2 - 2004-06-06
  o Changes from 0.0.7rc1:
    - Make it build on Win32 again.
  o Changes from 0.0.6.2:
    - Rotate dnsworkers and cpuworkers on SIGHUP, so they get new config
      settings too.


Changes in version 0.0.7rc1 - 2004-06-02
  o Bugfixes:
    - On sighup, we were adding another log without removing the first
      one. So log messages would get duplicated n times for n sighups.
    - Several cases of using a connection after we'd freed it. The
      problem was that connections that are pending resolve are in both
      the pending_resolve tree, and also the circuit's resolving_streams
      list. When you want to remove one, you must remove it from both.
    - Fix a double-mark-for-close where an end cell arrived for a
      resolving stream, and then the resolve failed.
    - Check directory signatures based on name of signer, not on whom
      we got the directory from. This will let us cache directories more
      easily.
  o Features:
    - Crank up some of our constants to handle more users.


Changes in version 0.0.7pre1 - 2004-06-02
  o Fixes for crashes and other obnoxious bugs:
    - Fix an epipe bug: sometimes when directory connections failed
      to connect, we would give them a chance to flush before closing
      them.
    - When we detached from a circuit because of resolvefailed, we
      would immediately try the same circuit twice more, and then
      give up on the resolve thinking we'd tried three different
      exit nodes.
    - Limit the number of intro circuits we'll attempt to build for a
      hidden service per 15-minute period.
    - Check recommended-software string *early*, before actually parsing
      the directory. Thus we can detect an obsolete version and exit,
      even if the new directory format doesn't parse.
  o Fixes for security bugs:
    - Remember which nodes are dirservers when you startup, and if a
      random OR enables his dirport, don't automatically assume he's
      a trusted dirserver.
  o Other bugfixes:
    - Directory connections were asking the wrong poll socket to
      start writing, and not asking themselves to start writing.
    - When we detached from a circuit because we sent a begin but
      didn't get a connected, we would use it again the first time;
      but after that we would correctly switch to a different one.
    - Stop warning when the first onion decrypt attempt fails; they
      will sometimes legitimately fail now that we rotate keys.
    - Override unaligned-access-ok check when $host_cpu is ia64 or
      arm. Apparently they allow it but the kernel whines.
    - Dirservers try to reconnect periodically too, in case connections
      have failed.
    - Fix some memory leaks in directory servers.
    - Allow backslash in Win32 filenames.
    - Made Tor build complain-free on FreeBSD, hopefully without
      breaking other BSD builds. We'll see.
  o Features:
    - Doxygen markup on all functions and global variables.
    - Make directory functions update routerlist, not replace it. So
      now directory disagreements are not so critical a problem.
    - Remove the upper limit on number of descriptors in a dirserver's
      directory (not that we were anywhere close).
    - Allow multiple logfiles at different severity ranges.
    - Allow *BindAddress to specify ":port" rather than setting *Port
      separately. Allow multiple instances of each BindAddress config
      option, so you can bind to multiple interfaces if you want.
    - Allow multiple exit policy lines, which are processed in order.
      Now we don't need that huge line with all the commas in it.
    - Enable accept/reject policies on SOCKS connections, so you can bind
      to 0.0.0.0 but still control who can use your OP.


Changes in version 0.0.6.2 - 2004-05-16
  o Our integrity-checking digest was checking only the most recent cell,
    not the previous cells like we'd thought.
    Thanks to Stefan Mark for finding the flaw!


Changes in version 0.0.6.1 - 2004-05-06
  o Fix two bugs in our AES counter-mode implementation (this affected
    onion-level stream encryption, but not TLS-level). It turns
    out we were doing something much more akin to a 16-character
    polyalphabetic cipher. Oops.
    Thanks to Stefan Mark for finding the flaw!
  o Retire moria3 as a directory server, and add tor26 as a directory
    server.


Changes in version 0.0.6 - 2004-05-02
  [version bump only]


Changes in version 0.0.6rc4 - 2004-05-01
  o Update the built-in dirservers list to use the new directory format
  o Fix a rare seg fault: if a node offering a hidden service attempts
    to build a circuit to Alice's rendezvous point and fails before it
    reaches the last hop, it retries with a different circuit, but
    then dies.
  o Handle windows socket errors correctly.


Changes in version 0.0.6rc3 - 2004-04-28
  o Don't expire non-general excess circuits (if we had enough
    circuits open, we were expiring rendezvous circuits -- even
    when they had a stream attached. oops.)
  o Fetch randomness from /dev/urandom better (not via fopen/fread)
  o Better debugging for tls errors
  o Some versions of openssl have an SSL_pending function that erroneously
    returns bytes when there is a non-application record pending.
  o Set Content-Type on the directory and hidserv descriptor.
  o Remove IVs from cipher code, since AES-ctr has none.
  o Win32 fixes. Tor now compiles on win32 with no warnings/errors.
    o We were using an array of length zero in a few places.
    o win32's gethostbyname can't resolve an IP to an IP.
    o win32's close can't close a socket.


Changes in version 0.0.6rc2 - 2004-04-26
  o Fix a bug where we were closing tls connections intermittently.
    It turns out openssl keeps its errors around -- so if an error
    happens, and you don't ask about it, and then another openssl
    operation happens and succeeds, and you ask if there was an error,
    it tells you about the first error. Fun fun.
  o Fix a bug that's been lurking since 27 may 03 (!)
    When passing back a destroy cell, we would use the wrong circ id.
    'Mostly harmless', but still worth fixing.
  o Since we don't support truncateds much, don't bother sending them;
    just close the circ.
  o check for <machine/limits.h> so we build on NetBSD again (I hope).
  o don't crash if a conn that sent a begin has suddenly lost its circuit
    (this was quite rare).


Changes in version 0.0.6rc1 - 2004-04-25
  o We now rotate link (tls context) keys and onion keys.
  o CREATE cells now include oaep padding, so you can tell
    if you decrypted them correctly.
  o Add bandwidthburst to server descriptor.
  o Directories now say which dirserver signed them.
  o Use a tor_assert macro that logs failed assertions too.


Changes in version 0.0.6pre5 - 2004-04-18
  o changes from 0.0.6pre4:
    - make tor build on broken freebsd 5.2 installs
    - fix a failed assert when you try an intro point, get a nack, and try
      a second one and it works.
    - when alice uses a port that the hidden service doesn't accept,
      it now sends back an end cell (denied by exit policy). otherwise
      alice would just have to wait to time out.
    - fix another rare bug: when we had tried all the intro
      points for a hidden service, we fetched the descriptor
      again, but we left our introcirc thinking it had already
      sent an intro, so it kept waiting for a response...
    - bugfix: when you sleep your hidden-service laptop, as soon
      as it wakes up it tries to upload a service descriptor, but
      socketpair fails for some reason (localhost not up yet?).
      now we simply give up on that upload, and we'll try again later.
      i'd still like to find the bug though.
    - if an intro circ waiting for an ack dies before getting one, then
      count it as a nack
    - we were reusing stale service descriptors and refetching usable
      ones. oops.


Changes in version 0.0.6pre4 - 2004-04-14
  o changes from 0.0.6pre3:
    - when bob fails to connect to the rendezvous point, and his
      circ didn't fail because of the rendezvous point itself, then
      he retries a couple of times
    - we expire introduction and rendezvous circs more thoroughly
      (sometimes they were hanging around forever)
    - we expire unattached rendezvous streams that have been around
      too long (they were sticking around forever).
    - fix a measly fencepost error that was crashing everybody with
      a strict glibc.


Changes in version 0.0.6pre3 - 2004-04-14
  o changes from 0.0.6pre2:
    - make hup work again
    - fix some memory leaks for dirservers
    - allow more skew in rendezvous descriptor timestamps, to help
      handle people like blanu who don't know what time it is
    - normal circs are 3 hops, but some rend/intro circs are 4, if
      the initiator doesn't get to choose the last hop
    - send acks for introductions, so alice can know whether to try
      again
    - bob publishes intro points more correctly
  o changes from 0.0.5:
    - fix an assert trigger that's been plaguing us since the days
      of 0.0.2prexx (thanks weasel!)
    - retry stream correctly when we fail to connect because of
      exit-policy-reject (should try another) or can't-resolve-address
      (also should try another, because dns on random internet servers
      is flaky).
    - when we hup a dirserver and we've *removed* a server from the
      approved-routers list, now we remove that server from the
      in-memory directories too


Changes in version 0.0.6pre2 - 2004-04-08
  o We fixed our base32 implementation. Now it works on all architectures.


Changes in version 0.0.6pre1 - 2004-04-08
  o Features:
    - Hidden services and rendezvous points are implemented. Go to
      http://6sxoyfb3h2nvok2d.onion/ for an index of currently available
      hidden services. (This only works via a socks4a proxy such as
      Privoxy, and currently it's quite slow.)


Changes in version 0.0.5 - 2004-03-30
  [version bump only]


Changes in version 0.0.5rc3 - 2004-03-29
  o Install torrc as torrc.sample -- we no longer clobber your
    torrc. (Woo!)
  o Re-enable recommendedversion checking (we broke it in rc2, oops)
  o Add in a 'notice' log level for things the operator should hear
    but that aren't warnings


Changes in version 0.0.5rc2 - 2004-03-29
  o Hold socks connection open until reply is flushed (if possible)
  o Make exit nodes resolve IPs to IPs immediately, rather than asking
    the dns farm to do it.
  o Fix c99 aliasing warnings in rephist.c
  o Don't include server descriptors that are older than 24 hours in the
    directory.
  o Give socks 'reject' replies their whole 15s to attempt to flush,
    rather than seeing the 60s timeout and assuming the flush had failed.
  o Clean automake droppings from the cvs repository


Changes in version 0.0.5rc1 - 2004-03-28
  o Fix mangled-state bug in directory fetching (was causing sigpipes).
  o Only build circuits after we've fetched the directory: clients were
    using only the directory servers before they'd fetched a directory.
    This also means longer startup time; so it goes.
  o Fix an assert trigger where an OP would fail to handshake, and we'd
    expect it to have a nickname.
  o Work around a tsocks bug: do a socks reject when AP connection dies
    early, else tsocks goes into an infinite loop.


Changes in version 0.0.4 - 2004-03-26
  o When connecting to a dirserver or OR and the network is down,
    we would crash.


Changes in version 0.0.3 - 2004-03-26
  o Warn and fail if server chose a nickname with illegal characters
  o Port to Solaris and Sparc:
    - include missing header fcntl.h
    - have autoconf find -lsocket -lnsl automatically
    - deal with hardware word alignment
    - make uname() work (solaris has a different return convention)
    - switch from using signal() to sigaction()
  o Preliminary work on reputation system:
    - Keep statistics on success/fail of connect attempts; they're published
      by kill -USR1 currently.
    - Add a RunTesting option to try to learn link state by creating test
      circuits, even when SocksPort is off.
    - Remove unused open circuits when there are too many.


Changes in version 0.0.2 - 2004-03-19
    - Include strlcpy and strlcat for safer string ops
    - define INADDR_NONE so we compile (but still not run) on solaris


Changes in version 0.0.2pre27 - 2004-03-14
  o Bugfixes:
    - Allow internal tor networks (we were rejecting internal IPs,
      now we allow them if they're set explicitly).
    - And fix a few endian issues.


Changes in version 0.0.2pre26 - 2004-03-14
  o New features:
    - If a stream times out after 15s without a connected cell, don't
      try that circuit again: try a new one.
    - Retry streams at most 4 times. Then give up.
    - When a dirserver gets a descriptor from an unknown router, it
      logs its fingerprint (so the dirserver operator can choose to
      accept it even without mail from the server operator).
    - Inform unapproved servers when we reject their descriptors.
    - Make tor build on Windows again. It works as a client, who knows
      about as a server.
    - Clearer instructions in the torrc for how to set up a server.
    - Be more efficient about reading fd's when our global token bucket
      (used for rate limiting) becomes empty.
  o Bugfixes:
    - Stop asserting that computers always go forward in time. It's
      simply not true.
    - When we sent a cell (e.g. destroy) and then marked an OR connection
      expired, we might close it before finishing a flush if the other
      side isn't reading right then.
    - Don't allow dirservers to start if they haven't defined
      RecommendedVersions
    - We were caching transient dns failures. Oops.
    - Prevent servers from publishing an internal IP as their address.
    - Address a strcat vulnerability in circuit.c


Changes in version 0.0.2pre25 - 2004-03-04
  o New features:
    - Put the OR's IP in its router descriptor, not its fqdn. That way
      we'll stop being stalled by gethostbyname for nodes with flaky dns,
      e.g. poblano.
  o Bugfixes:
    - If the user typed in an address that didn't resolve, the server
      crashed.


Changes in version 0.0.2pre24 - 2004-03-03
  o Bugfixes:
    - Fix an assertion failure in dns.c, where we were trying to dequeue
      a pending dns resolve even if it wasn't pending
    - Fix a spurious socks5 warning about still trying to write after the
      connection is finished.
    - Hold certain marked_for_close connections open until they're finished
      flushing, rather than losing bytes by closing them too early.
    - Correctly report the reason for ending a stream
    - Remove some duplicate calls to connection_mark_for_close
    - Put switch_id and start_daemon earlier in the boot sequence, so it
      will actually try to chdir() to options.DataDirectory
    - Make 'make test' exit(1) if a test fails; fix some unit tests
    - Make tor fail when you use a config option it doesn't know about,
      rather than warn and continue.
    - Make --version work
    - Bugfixes on the rpm spec file and tor.sh, so it's more up to date


Changes in version 0.0.2pre23 - 2004-02-29
  o New features:
    - Print a statement when the first circ is finished, so the user
      knows it's working.
    - If a relay cell is unrecognized at the end of the circuit,
      send back a destroy. (So attacks to mutate cells are more
      clearly thwarted.)
    - New config option 'excludenodes' to avoid certain nodes for circuits.
    - When it daemonizes, it chdir's to the DataDirectory rather than "/",
      so you can collect coredumps there.
 o Bugfixes:
    - Fix a bug in tls flushing where sometimes data got wedged and
      didn't flush until more data got sent. Hopefully this bug was
      a big factor in the random delays we were seeing.
    - Make 'connected' cells include the resolved IP, so the client
      dns cache actually gets populated.
    - Disallow changing from ORPort=0 to ORPort>0 on hup.
    - When we time-out on a stream and detach from the circuit, send an
      end cell down it first.
    - Only warn about an unknown router (in exitnodes, entrynodes,
      excludenodes) after we've fetched a directory.


Changes in version 0.0.2pre22 - 2004-02-26
  o New features:
    - Servers publish less revealing uname information in descriptors.
    - More memory tracking and assertions, to crash more usefully when
      errors happen.
    - If the default torrc isn't there, just use some default defaults.
      Plus provide an internal dirservers file if they don't have one.
    - When the user tries to use Tor as an http proxy, give them an http
      501 failure explaining that we're a socks proxy.
    - Dump a new router.desc on hup, to help confused people who change
      their exit policies and then wonder why router.desc doesn't reflect
      it.
    - Clean up the generic tor.sh init script that we ship with.
  o Bugfixes:
    - If the exit stream is pending on the resolve, and a destroy arrives,
      then the stream wasn't getting removed from the pending list. I
      think this was the one causing recent server crashes.
    - Use a more robust poll on OSX 10.3, since their poll is flaky.
    - When it couldn't resolve any dirservers, it was useless from then on.
      Now it reloads the RouterFile (or default dirservers) if it has no
      dirservers.
    - Move the 'tor' binary back to /usr/local/bin/ -- it turns out
      many users don't even *have* a /usr/local/sbin/.


Changes in version 0.0.2pre21 - 2004-02-18
  o New features:
    - There's a ChangeLog file that actually reflects the changelog.
    - There's a 'torify' wrapper script, with an accompanying
      tor-tsocks.conf, that simplifies the process of using tsocks for
      tor. It even has a man page.
    - The tor binary gets installed to sbin rather than bin now.
    - Retry streams where the connected cell hasn't arrived in 15 seconds
    - Clean up exit policy handling -- get the default out of the torrc,
      so we can update it without forcing each server operator to fix
      his/her torrc.
    - Allow imaps and pop3s in default exit policy
  o Bugfixes:
    - Prevent picking middleman nodes as the last node in the circuit


Changes in version 0.0.2pre20 - 2004-01-30
  o New features:
    - We now have a deb package, and it's in debian unstable. Go to
      it, apt-getters. :)
    - I've split the TotalBandwidth option into BandwidthRate (how many
      bytes per second you want to allow, long-term) and
      BandwidthBurst (how many bytes you will allow at once before the cap
      kicks in).  This better token bucket approach lets you, say, set
      BandwidthRate to 10KB/s and BandwidthBurst to 10MB, allowing good
      performance while not exceeding your monthly bandwidth quota.
    - Push out a tls record's worth of data once you've got it, rather
      than waiting until you've read everything waiting to be read. This
      may improve performance by pipelining better. We'll see.
    - Add an AP_CONN_STATE_CONNECTING state, to allow streams to detach
      from failed circuits (if they haven't been connected yet) and attach
      to new ones.
    - Expire old streams that haven't managed to connect. Some day we'll
      have them reattach to new circuits instead.

  o Bugfixes:
    - Fix several memory leaks that were causing servers to become bloated
      after a while.
    - Fix a few very rare assert triggers. A few more remain.
    - Setuid to User _before_ complaining about running as root.


Changes in version 0.0.2pre19 - 2004-01-07
  o Bugfixes:
    - Fix deadlock condition in dns farm. We were telling a child to die by
      closing the parent's file descriptor to him. But newer children were
      inheriting the open file descriptor from the parent, and since they
      weren't closing it, the socket never closed, so the child never read
      eof, so he never knew to exit. Similarly, dns workers were holding
      open other sockets, leading to all sorts of chaos.
    - New cleaner daemon() code for forking and backgrounding.
    - If you log to a file, it now prints an entry at the top of the
      logfile so you know it's working.
    - The onionskin challenge length was 30 bytes longer than necessary.
    - Started to patch up the spec so it's not quite so out of date.


Changes in version 0.0.2pre18 - 2004-01-02
  o Bugfixes:
    - Fix endian issues with the 'integrity' field in the relay header.
    - Fix a potential bug where connections in state
      AP_CONN_STATE_CIRCUIT_WAIT might unexpectedly ask to write.


Changes in version 0.0.2pre17 - 2003-12-30
  o Bugfixes:
    - Made --debuglogfile (or any second log file, actually) work.
    - Resolved an edge case in get_unique_circ_id_by_conn where a smart
      adversary could force us into an infinite loop.

  o Features:
    - Each onionskin handshake now includes a hash of the computed key,
      to prove the server's identity and help perfect forward secrecy.
    - Changed cell size from 256 to 512 bytes (working toward compatibility
      with MorphMix).
    - Changed cell length to 2 bytes, and moved it to the relay header.
    - Implemented end-to-end integrity checking for the payloads of
      relay cells.
    - Separated streamid from 'recognized' (otherwise circuits will get
      messed up when we try to have streams exit from the middle). We
      use the integrity-checking to confirm that a cell is addressed to
      this hop.
    - Randomize the initial circid and streamid values, so an adversary who
      breaks into a node can't learn how many circuits or streams have
      been made so far.


Changes in version 0.0.2pre16 - 2003-12-14
  o Bugfixes:
    - Fixed a bug that made HUP trigger an assert
    - Fixed a bug where a circuit that immediately failed wasn't being
      counted as a failed circuit in counting retries.

  o Features:
    - Now we close the circuit when we get a truncated cell: otherwise we're
      open to an anonymity attack where a bad node in the path truncates
      the circuit and then we open streams at him.
    - Add port ranges to exit policies
    - Add a conservative default exit policy
    - Warn if you're running tor as root
    - on HUP, retry OR connections and close/rebind listeners
    - options.EntryNodes: try these nodes first when picking the first node
    - options.ExitNodes: if your best choices happen to include any of
      your preferred exit nodes, you choose among just those preferred
      exit nodes.
    - options.ExcludedNodes: nodes that are never picked in path building


Changes in version 0.0.2pre15 - 2003-12-03
  o Robustness and bugfixes:
    - Sometimes clients would cache incorrect DNS resolves, which would
      really screw things up.
    - An OP that goes offline would slowly leak all its sockets and stop
      working.
    - A wide variety of bugfixes in exit node selection, exit policy
      handling, and processing pending streams when a new circuit is
      established.
    - Pick nodes for a path only from those the directory says are up
    - Choose randomly from all running dirservers, not always the first one
    - Increase allowed http header size for directory fetch.
    - Stop writing to stderr (if we're daemonized it will be closed).
    - Enable -g always, so cores will be more useful to me.
    - Switch "-lcrypto -lssl" to "-lssl -lcrypto" for broken distributions.

  o Documentation:
    - Wrote a man page. It lists commonly used options.

  o Configuration:
    - Change default loglevel to warn.
    - Make PidFile default to null rather than littering in your CWD.
    - OnionRouter config option is now obsolete. Instead it just checks
      ORPort>0.
    - Moved to a single unified torrc file for both clients and servers.


Changes in version 0.0.2pre14 - 2003-11-29
  o Robustness and bugfixes:
    - Force the admin to make the DataDirectory himself
      - to get ownership/permissions right
      - so clients no longer make a DataDirectory and then never use it
    - fix bug where a client who was offline for 45 minutes would never
      pull down a directory again
    - fix (or at least hide really well) the dns assert bug that was
      causing server crashes
    - warnings and improved robustness wrt clockskew for certs
    - use the native daemon(3) to daemonize, when available
    - exit if bind() fails
    - exit if neither socksport nor orport is defined
    - include our own tor_timegm (Win32 doesn't have its own)
    - bugfix for win32 with lots of connections
    - fix minor bias in PRNG
    - make dirserver more robust to corrupt cached directory

  o Documentation:
    - Wrote the design document (woo)

  o Circuit building and exit policies:
    - Circuits no longer try to use nodes that the directory has told them
      are down.
    - Exit policies now support bitmasks (18.0.0.0/255.0.0.0) and
      bitcounts (18.0.0.0/8).
    - Make AP connections standby for a circuit if no suitable circuit
      exists, rather than failing
    - Circuits choose exit node based on addr/port, exit policies, and
      which AP connections are standing by
    - Bump min pathlen from 2 to 3
    - Relay end cells have a payload to describe why the stream ended.
    - If the stream failed because of exit policy, try again with a new
      circuit.
    - Clients have a dns cache to remember resolved addresses.
    - Notice more quickly when we have no working circuits

  o Configuration:
    - APPort is now called SocksPort
    - SocksBindAddress, ORBindAddress, DirBindAddress let you configure
      where to bind
    - RecommendedVersions is now a config variable rather than
      hardcoded (for dirservers)
    - Reloads config on HUP
    - Usage info on -h or --help
    - If you set User and Group config vars, it'll setu/gid to them.


Changes in version 0.0.2pre13 - 2003-10-19
  o General stability:
    - SSL_write no longer fails when it returns WANTWRITE and the number
      of bytes in the buf has changed by the next SSL_write call.
    - Fix segfault fetching directory when network is down
    - Fix a variety of minor memory leaks
    - Dirservers reload the fingerprints file on HUP, so I don't have
      to take down the network when I approve a new router
    - Default server config file has explicit Address line to specify fqdn

  o Buffers:
    - Buffers grow and shrink as needed (Cut process size from 20M to 2M)
    - Make listener connections not ever alloc bufs

  o Autoconf improvements:
    - don't clobber an external CFLAGS in ./configure
    - Make install now works
    - create var/lib/tor on make install
    - autocreate a tor.sh initscript to help distribs
    - autocreate the torrc and sample-server-torrc with correct paths

  o Log files and Daemonizing now work:
    - If --DebugLogFile is specified, log to it at -l debug
    - If --LogFile is specified, use it instead of commandline
    - If --RunAsDaemon is set, tor forks and backgrounds on startup