aboutsummaryrefslogtreecommitdiff
path: root/src/or/router.c
blob: 1f5df4b8989aba287db44507a806bdf55400aa3e (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
/* Copyright (c) 2001 Matej Pfajfar.
 * Copyright (c) 2001-2004, Roger Dingledine.
 * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
 * Copyright (c) 2007-2013, The Tor Project, Inc. */
/* See LICENSE for licensing information */

#define ROUTER_PRIVATE

#include "or.h"
#include "circuitbuild.h"
#include "circuitlist.h"
#include "circuituse.h"
#include "config.h"
#include "connection.h"
#include "control.h"
#include "crypto_curve25519.h"
#include "directory.h"
#include "dirserv.h"
#include "dns.h"
#include "geoip.h"
#include "hibernate.h"
#include "main.h"
#include "networkstatus.h"
#include "nodelist.h"
#include "policies.h"
#include "relay.h"
#include "rephist.h"
#include "router.h"
#include "routerlist.h"
#include "routerparse.h"
#include "statefile.h"
#include "transports.h"
#include "routerset.h"

/**
 * \file router.c
 * \brief OR functionality, including key maintenance, generating
 * and uploading server descriptors, retrying OR connections.
 **/

extern long stats_n_seconds_working;

/************************************************************/

/*****
 * Key management: ORs only.
 *****/

/** Private keys for this OR.  There is also an SSL key managed by tortls.c.
 */
static tor_mutex_t *key_lock=NULL;
static time_t onionkey_set_at=0; /**< When was onionkey last changed? */
/** Current private onionskin decryption key: used to decode CREATE cells. */
static crypto_pk_t *onionkey=NULL;
/** Previous private onionskin decryption key: used to decode CREATE cells
 * generated by clients that have an older version of our descriptor. */
static crypto_pk_t *lastonionkey=NULL;
#ifdef CURVE25519_ENABLED
/** Current private ntor secret key: used to perform the ntor handshake. */
static curve25519_keypair_t curve25519_onion_key;
/** Previous private ntor secret key: used to perform the ntor handshake
 * with clients that have an older version of our descriptor. */
static curve25519_keypair_t last_curve25519_onion_key;
#endif
/** Private server "identity key": used to sign directory info and TLS
 * certificates. Never changes. */
static crypto_pk_t *server_identitykey=NULL;
/** Digest of server_identitykey. */
static char server_identitykey_digest[DIGEST_LEN];
/** Private client "identity key": used to sign bridges' and clients'
 * outbound TLS certificates. Regenerated on startup and on IP address
 * change. */
static crypto_pk_t *client_identitykey=NULL;
/** Signing key used for v3 directory material; only set for authorities. */
static crypto_pk_t *authority_signing_key = NULL;
/** Key certificate to authenticate v3 directory material; only set for
 * authorities. */
static authority_cert_t *authority_key_certificate = NULL;

/** For emergency V3 authority key migration: An extra signing key that we use
 * with our old (obsolete) identity key for a while. */
static crypto_pk_t *legacy_signing_key = NULL;
/** For emergency V3 authority key migration: An extra certificate to
 * authenticate legacy_signing_key with our obsolete identity key.*/
static authority_cert_t *legacy_key_certificate = NULL;

/* (Note that v3 authorities also have a separate "authority identity key",
 * but this key is never actually loaded by the Tor process.  Instead, it's
 * used by tor-gencert to sign new signing keys and make new key
 * certificates. */

/** Replace the current onion key with <b>k</b>.  Does not affect
 * lastonionkey; to update lastonionkey correctly, call rotate_onion_key().
 */
static void
set_onion_key(crypto_pk_t *k)
{
  if (onionkey && crypto_pk_eq_keys(onionkey, k)) {
    /* k is already our onion key; free it and return */
    crypto_pk_free(k);
    return;
  }
  tor_mutex_acquire(key_lock);
  crypto_pk_free(onionkey);
  onionkey = k;
  tor_mutex_release(key_lock);
  mark_my_descriptor_dirty("set onion key");
}

/** Return the current onion key.  Requires that the onion key has been
 * loaded or generated. */
crypto_pk_t *
get_onion_key(void)
{
  tor_assert(onionkey);
  return onionkey;
}

/** Store a full copy of the current onion key into *<b>key</b>, and a full
 * copy of the most recent onion key into *<b>last</b>.
 */
void
dup_onion_keys(crypto_pk_t **key, crypto_pk_t **last)
{
  tor_assert(key);
  tor_assert(last);
  tor_mutex_acquire(key_lock);
  tor_assert(onionkey);
  *key = crypto_pk_copy_full(onionkey);
  if (lastonionkey)
    *last = crypto_pk_copy_full(lastonionkey);
  else
    *last = NULL;
  tor_mutex_release(key_lock);
}

#ifdef CURVE25519_ENABLED
/** Return the current secret onion key for the ntor handshake. Must only
 * be called from the main thread. */
static const curve25519_keypair_t *
get_current_curve25519_keypair(void)
{
  return &curve25519_onion_key;
}
/** Return a map from KEYID (the key itself) to keypairs for use in the ntor
 * handshake. Must only be called from the main thread. */
di_digest256_map_t *
construct_ntor_key_map(void)
{
  di_digest256_map_t *m = NULL;

  dimap_add_entry(&m,
                  curve25519_onion_key.pubkey.public_key,
                  tor_memdup(&curve25519_onion_key,
                             sizeof(curve25519_keypair_t)));
  if (!tor_mem_is_zero((const char*)
                          last_curve25519_onion_key.pubkey.public_key,
                       CURVE25519_PUBKEY_LEN)) {
    dimap_add_entry(&m,
                    last_curve25519_onion_key.pubkey.public_key,
                    tor_memdup(&last_curve25519_onion_key,
                               sizeof(curve25519_keypair_t)));
  }

  return m;
}
/** Helper used to deallocate a di_digest256_map_t returned by
 * construct_ntor_key_map. */
static void
ntor_key_map_free_helper(void *arg)
{
  curve25519_keypair_t *k = arg;
  memwipe(k, 0, sizeof(*k));
  tor_free(k);
}
/** Release all storage from a keymap returned by construct_ntor_key_map. */
void
ntor_key_map_free(di_digest256_map_t *map)
{
  if (!map)
    return;
  dimap_free(map, ntor_key_map_free_helper);
}
#endif

/** Return the time when the onion key was last set.  This is either the time
 * when the process launched, or the time of the most recent key rotation since
 * the process launched.
 */
time_t
get_onion_key_set_at(void)
{
  return onionkey_set_at;
}

/** Set the current server identity key to <b>k</b>.
 */
void
set_server_identity_key(crypto_pk_t *k)
{
  crypto_pk_free(server_identitykey);
  server_identitykey = k;
  crypto_pk_get_digest(server_identitykey, server_identitykey_digest);
}

/** Make sure that we have set up our identity keys to match or not match as
 * appropriate, and die with an assertion if we have not. */
static void
assert_identity_keys_ok(void)
{
  tor_assert(client_identitykey);
  if (public_server_mode(get_options())) {
    /* assert that we have set the client and server keys to be equal */
    tor_assert(server_identitykey);
    tor_assert(crypto_pk_eq_keys(client_identitykey, server_identitykey));
  } else {
    /* assert that we have set the client and server keys to be unequal */
    if (server_identitykey)
      tor_assert(!crypto_pk_eq_keys(client_identitykey, server_identitykey));
  }
}

/** Returns the current server identity key; requires that the key has
 * been set, and that we are running as a Tor server.
 */
crypto_pk_t *
get_server_identity_key(void)
{
  tor_assert(server_identitykey);
  tor_assert(server_mode(get_options()));
  assert_identity_keys_ok();
  return server_identitykey;
}

/** Return true iff we are a server and the server identity key
 * has been set. */
int
server_identity_key_is_set(void)
{
  return server_mode(get_options()) && server_identitykey != NULL;
}

/** Set the current client identity key to <b>k</b>.
 */
void
set_client_identity_key(crypto_pk_t *k)
{
  crypto_pk_free(client_identitykey);
  client_identitykey = k;
}

/** Returns the current client identity key for use on outgoing TLS
 * connections; requires that the key has been set.
 */
crypto_pk_t *
get_tlsclient_identity_key(void)
{
  tor_assert(client_identitykey);
  assert_identity_keys_ok();
  return client_identitykey;
}

/** Return true iff the client identity key has been set. */
int
client_identity_key_is_set(void)
{
  return client_identitykey != NULL;
}

/** Return the key certificate for this v3 (voting) authority, or NULL
 * if we have no such certificate. */
authority_cert_t *
get_my_v3_authority_cert(void)
{
  return authority_key_certificate;
}

/** Return the v3 signing key for this v3 (voting) authority, or NULL
 * if we have no such key. */
crypto_pk_t *
get_my_v3_authority_signing_key(void)
{
  return authority_signing_key;
}

/** If we're an authority, and we're using a legacy authority identity key for
 * emergency migration purposes, return the certificate associated with that
 * key. */
authority_cert_t *
get_my_v3_legacy_cert(void)
{
  return legacy_key_certificate;
}

/** If we're an authority, and we're using a legacy authority identity key for
 * emergency migration purposes, return that key. */
crypto_pk_t *
get_my_v3_legacy_signing_key(void)
{
  return legacy_signing_key;
}

/** Replace the previous onion key with the current onion key, and generate
 * a new previous onion key.  Immediately after calling this function,
 * the OR should:
 *   - schedule all previous cpuworkers to shut down _after_ processing
 *     pending work.  (This will cause fresh cpuworkers to be generated.)
 *   - generate and upload a fresh routerinfo.
 */
void
rotate_onion_key(void)
{
  char *fname, *fname_prev;
  crypto_pk_t *prkey = NULL;
  or_state_t *state = get_or_state();
#ifdef CURVE25519_ENABLED
  curve25519_keypair_t new_curve25519_keypair;
#endif
  time_t now;
  fname = get_datadir_fname2("keys", "secret_onion_key");
  fname_prev = get_datadir_fname2("keys", "secret_onion_key.old");
  if (file_status(fname) == FN_FILE) {
    if (replace_file(fname, fname_prev))
      goto error;
  }
  if (!(prkey = crypto_pk_new())) {
    log_err(LD_GENERAL,"Error constructing rotated onion key");
    goto error;
  }
  if (crypto_pk_generate_key(prkey)) {
    log_err(LD_BUG,"Error generating onion key");
    goto error;
  }
  if (crypto_pk_write_private_key_to_filename(prkey, fname)) {
    log_err(LD_FS,"Couldn't write generated onion key to \"%s\".", fname);
    goto error;
  }
#ifdef CURVE25519_ENABLED
  tor_free(fname);
  tor_free(fname_prev);
  fname = get_datadir_fname2("keys", "secret_onion_key_ntor");
  fname_prev = get_datadir_fname2("keys", "secret_onion_key_ntor.old");
  if (curve25519_keypair_generate(&new_curve25519_keypair, 1) < 0)
    goto error;
  if (file_status(fname) == FN_FILE) {
    if (replace_file(fname, fname_prev))
      goto error;
  }
  if (curve25519_keypair_write_to_file(&new_curve25519_keypair, fname,
                                       "onion") < 0) {
    log_err(LD_FS,"Couldn't write curve25519 onion key to \"%s\".",fname);
    goto error;
  }
#endif
  log_info(LD_GENERAL, "Rotating onion key");
  tor_mutex_acquire(key_lock);
  crypto_pk_free(lastonionkey);
  lastonionkey = onionkey;
  onionkey = prkey;
#ifdef CURVE25519_ENABLED
  memcpy(&last_curve25519_onion_key, &curve25519_onion_key,
         sizeof(curve25519_keypair_t));
  memcpy(&curve25519_onion_key, &new_curve25519_keypair,
         sizeof(curve25519_keypair_t));
#endif
  now = time(NULL);
  state->LastRotatedOnionKey = onionkey_set_at = now;
  tor_mutex_release(key_lock);
  mark_my_descriptor_dirty("rotated onion key");
  or_state_mark_dirty(state, get_options()->AvoidDiskWrites ? now+3600 : 0);
  goto done;
 error:
  log_warn(LD_GENERAL, "Couldn't rotate onion key.");
  if (prkey)
    crypto_pk_free(prkey);
 done:
#ifdef CURVE25519_ENABLED
  memwipe(&new_curve25519_keypair, 0, sizeof(new_curve25519_keypair));
#endif
  tor_free(fname);
  tor_free(fname_prev);
}

/** Try to read an RSA key from <b>fname</b>.  If <b>fname</b> doesn't exist
 * and <b>generate</b> is true, create a new RSA key and save it in
 * <b>fname</b>.  Return the read/created key, or NULL on error.  Log all
 * errors at level <b>severity</b>.
 */
crypto_pk_t *
init_key_from_file(const char *fname, int generate, int severity)
{
  crypto_pk_t *prkey = NULL;

  if (!(prkey = crypto_pk_new())) {
    tor_log(severity, LD_GENERAL,"Error constructing key");
    goto error;
  }

  switch (file_status(fname)) {
    case FN_DIR:
    case FN_ERROR:
      tor_log(severity, LD_FS,"Can't read key from \"%s\"", fname);
      goto error;
    case FN_NOENT:
      if (generate) {
        if (!have_lockfile()) {
          if (try_locking(get_options(), 0)<0) {
            /* Make sure that --list-fingerprint only creates new keys
             * if there is no possibility for a deadlock. */
            tor_log(severity, LD_FS, "Another Tor process has locked \"%s\". "
                    "Not writing any new keys.", fname);
            /*XXXX The 'other process' might make a key in a second or two;
             * maybe we should wait for it. */
            goto error;
          }
        }
        log_info(LD_GENERAL, "No key found in \"%s\"; generating fresh key.",
                 fname);
        if (crypto_pk_generate_key(prkey)) {
          tor_log(severity, LD_GENERAL,"Error generating onion key");
          goto error;
        }
        if (crypto_pk_check_key(prkey) <= 0) {
          tor_log(severity, LD_GENERAL,"Generated key seems invalid");
          goto error;
        }
        log_info(LD_GENERAL, "Generated key seems valid");
        if (crypto_pk_write_private_key_to_filename(prkey, fname)) {
          tor_log(severity, LD_FS,
              "Couldn't write generated key to \"%s\".", fname);
          goto error;
        }
      } else {
        log_info(LD_GENERAL, "No key found in \"%s\"", fname);
      }
      return prkey;
    case FN_FILE:
      if (crypto_pk_read_private_key_from_filename(prkey, fname)) {
        tor_log(severity, LD_GENERAL,"Error loading private key.");
        goto error;
      }
      return prkey;
    default:
      tor_assert(0);
  }

 error:
  if (prkey)
    crypto_pk_free(prkey);
  return NULL;
}

#ifdef CURVE25519_ENABLED
/** Load a curve25519 keypair from the file <b>fname</b>, writing it into
 * <b>keys_out</b>.  If the file isn't found and <b>generate</b> is true,
 * create a new keypair and write it into the file.  If there are errors, log
 * them at level <b>severity</b>. Generate files using <b>tag</b> in their
 * ASCII wrapper. */
static int
init_curve25519_keypair_from_file(curve25519_keypair_t *keys_out,
                                  const char *fname,
                                  int generate,
                                  int severity,
                                  const char *tag)
{
  switch (file_status(fname)) {
    case FN_DIR:
    case FN_ERROR:
      tor_log(severity, LD_FS,"Can't read key from \"%s\"", fname);
      goto error;
    case FN_NOENT:
      if (generate) {
        if (!have_lockfile()) {
          if (try_locking(get_options(), 0)<0) {
            /* Make sure that --list-fingerprint only creates new keys
             * if there is no possibility for a deadlock. */
            tor_log(severity, LD_FS, "Another Tor process has locked \"%s\". "
                    "Not writing any new keys.", fname);
            /*XXXX The 'other process' might make a key in a second or two;
             * maybe we should wait for it. */
            goto error;
          }
        }
        log_info(LD_GENERAL, "No key found in \"%s\"; generating fresh key.",
                 fname);
        if (curve25519_keypair_generate(keys_out, 1) < 0)
          goto error;
        if (curve25519_keypair_write_to_file(keys_out, fname, tag)<0) {
          tor_log(severity, LD_FS,
              "Couldn't write generated key to \"%s\".", fname);
          memset(keys_out, 0, sizeof(*keys_out));
          goto error;
        }
      } else {
        log_info(LD_GENERAL, "No key found in \"%s\"", fname);
      }
      return 0;
    case FN_FILE:
      {
        char *tag_in=NULL;
        if (curve25519_keypair_read_from_file(keys_out, &tag_in, fname) < 0) {
          tor_log(severity, LD_GENERAL,"Error loading private key.");
          tor_free(tag_in);
          goto error;
        }
        if (!tag_in || strcmp(tag_in, tag)) {
          tor_log(severity, LD_GENERAL,"Unexpected tag %s on private key.",
              escaped(tag_in));
          tor_free(tag_in);
          goto error;
        }
        tor_free(tag_in);
        return 0;
      }
    default:
      tor_assert(0);
  }

 error:
  return -1;
}
#endif

/** Try to load the vote-signing private key and certificate for being a v3
 * directory authority, and make sure they match.  If <b>legacy</b>, load a
 * legacy key/cert set for emergency key migration; otherwise load the regular
 * key/cert set.  On success, store them into *<b>key_out</b> and
 * *<b>cert_out</b> respectively, and return 0.  On failure, return -1. */
static int
load_authority_keyset(int legacy, crypto_pk_t **key_out,
                      authority_cert_t **cert_out)
{
  int r = -1;
  char *fname = NULL, *cert = NULL;
  const char *eos = NULL;
  crypto_pk_t *signing_key = NULL;
  authority_cert_t *parsed = NULL;

  fname = get_datadir_fname2("keys",
                 legacy ? "legacy_signing_key" : "authority_signing_key");
  signing_key = init_key_from_file(fname, 0, LOG_INFO);
  if (!signing_key) {
    log_warn(LD_DIR, "No version 3 directory key found in %s", fname);
    goto done;
  }
  tor_free(fname);
  fname = get_datadir_fname2("keys",
               legacy ? "legacy_certificate" : "authority_certificate");
  cert = read_file_to_str(fname, 0, NULL);
  if (!cert) {
    log_warn(LD_DIR, "Signing key found, but no certificate found in %s",
               fname);
    goto done;
  }
  parsed = authority_cert_parse_from_string(cert, &eos);
  if (!parsed) {
    log_warn(LD_DIR, "Unable to parse certificate in %s", fname);
    goto done;
  }
  if (!crypto_pk_eq_keys(signing_key, parsed->signing_key)) {
    log_warn(LD_DIR, "Stored signing key does not match signing key in "
             "certificate");
    goto done;
  }

  crypto_pk_free(*key_out);
  authority_cert_free(*cert_out);

  *key_out = signing_key;
  *cert_out = parsed;
  r = 0;
  signing_key = NULL;
  parsed = NULL;

 done:
  tor_free(fname);
  tor_free(cert);
  crypto_pk_free(signing_key);
  authority_cert_free(parsed);
  return r;
}

/** Load the v3 (voting) authority signing key and certificate, if they are
 * present.  Return -1 if anything is missing, mismatched, or unloadable;
 * return 0 on success. */
static int
init_v3_authority_keys(void)
{
  if (load_authority_keyset(0, &authority_signing_key,
                            &authority_key_certificate)<0)
    return -1;

  if (get_options()->V3AuthUseLegacyKey &&
      load_authority_keyset(1, &legacy_signing_key,
                            &legacy_key_certificate)<0)
    return -1;

  return 0;
}

/** If we're a v3 authority, check whether we have a certificate that's
 * likely to expire soon.  Warn if we do, but not too often. */
void
v3_authority_check_key_expiry(void)
{
  time_t now, expires;
  static time_t last_warned = 0;
  int badness, time_left, warn_interval;
  if (!authdir_mode_v3(get_options()) || !authority_key_certificate)
    return;

  now = time(NULL);
  expires = authority_key_certificate->expires;
  time_left = (int)( expires - now );
  if (time_left <= 0) {
    badness = LOG_ERR;
    warn_interval = 60*60;
  } else if (time_left <= 24*60*60) {
    badness = LOG_WARN;
    warn_interval = 60*60;
  } else if (time_left <= 24*60*60*7) {
    badness = LOG_WARN;
    warn_interval = 24*60*60;
  } else if (time_left <= 24*60*60*30) {
    badness = LOG_WARN;
    warn_interval = 24*60*60*5;
  } else {
    return;
  }

  if (last_warned + warn_interval > now)
    return;

  if (time_left <= 0) {
    tor_log(badness, LD_DIR, "Your v3 authority certificate has expired."
            " Generate a new one NOW.");
  } else if (time_left <= 24*60*60) {
    tor_log(badness, LD_DIR, "Your v3 authority certificate expires in %d "
            "hours; Generate a new one NOW.", time_left/(60*60));
  } else {
    tor_log(badness, LD_DIR, "Your v3 authority certificate expires in %d "
            "days; Generate a new one soon.", time_left/(24*60*60));
  }
  last_warned = now;
}

/** Set up Tor's TLS contexts, based on our configuration and keys. Return 0
 * on success, and -1 on failure. */
int
router_initialize_tls_context(void)
{
  unsigned int flags = 0;
  const or_options_t *options = get_options();
  int lifetime = options->SSLKeyLifetime;
  if (public_server_mode(options))
    flags |= TOR_TLS_CTX_IS_PUBLIC_SERVER;
  if (options->TLSECGroup) {
    if (!strcasecmp(options->TLSECGroup, "P256"))
      flags |= TOR_TLS_CTX_USE_ECDHE_P256;
    else if (!strcasecmp(options->TLSECGroup, "P224"))
      flags |= TOR_TLS_CTX_USE_ECDHE_P224;
  }
  if (!lifetime) { /* we should guess a good ssl cert lifetime */

    /* choose between 5 and 365 days, and round to the day */
    lifetime = 5*24*3600 + crypto_rand_int(361*24*3600);
    lifetime -= lifetime % (24*3600);

    if (crypto_rand_int(2)) {
      /* Half the time we expire at midnight, and half the time we expire
       * one second before midnight. (Some CAs wobble their expiry times a
       * bit in practice, perhaps to reduce collision attacks; see ticket
       * 8443 for details about observed certs in the wild.) */
      lifetime--;
    }
  }

  /* It's ok to pass lifetime in as an unsigned int, since
   * config_parse_interval() checked it. */
  return tor_tls_context_init(flags,
                              get_tlsclient_identity_key(),
                              server_mode(options) ?
                              get_server_identity_key() : NULL,
                              (unsigned int)lifetime);
}

/** Compute fingerprint (or hashed fingerprint if hashed is 1) and write
 * it to 'fingerprint' (or 'hashed-fingerprint'). Return 0 on success, or
 * -1 if Tor should die,
 */
STATIC int
router_write_fingerprint(int hashed)
{
  char *keydir = NULL, *cp = NULL;
  const char *fname = hashed ? "hashed-fingerprint" :
                               "fingerprint";
  char fingerprint[FINGERPRINT_LEN+1];
  const or_options_t *options = get_options();
  char *fingerprint_line = NULL;
  int result = -1;

  keydir = get_datadir_fname(fname);
  log_info(LD_GENERAL,"Dumping %sfingerprint to \"%s\"...",
           hashed ? "hashed " : "", keydir);
  if (!hashed) {
    if (crypto_pk_get_fingerprint(get_server_identity_key(),
                                  fingerprint, 0) < 0) {
      log_err(LD_GENERAL,"Error computing fingerprint");
      goto done;
    }
  } else {
    if (crypto_pk_get_hashed_fingerprint(get_server_identity_key(),
                                         fingerprint) < 0) {
      log_err(LD_GENERAL,"Error computing hashed fingerprint");
      goto done;
    }
  }

  tor_asprintf(&fingerprint_line, "%s %s\n", options->Nickname, fingerprint);

  /* Check whether we need to write the (hashed-)fingerprint file. */

  cp = read_file_to_str(keydir, RFTS_IGNORE_MISSING, NULL);
  if (!cp || strcmp(cp, fingerprint_line)) {
    if (write_str_to_file(keydir, fingerprint_line, 0)) {
      log_err(LD_FS, "Error writing %sfingerprint line to file",
              hashed ? "hashed " : "");
      goto done;
    }
  }

  log_notice(LD_GENERAL, "Your Tor %s identity key fingerprint is '%s %s'",
             hashed ? "bridge's hashed" : "server's", options->Nickname,
             fingerprint);

  result = 0;
 done:
  tor_free(cp);
  tor_free(keydir);
  tor_free(fingerprint_line);
  return result;
}

/** Initialize all OR private keys, and the TLS context, as necessary.
 * On OPs, this only initializes the tls context. Return 0 on success,
 * or -1 if Tor should die.
 */
int
init_keys(void)
{
  char *keydir;
  const char *mydesc;
  crypto_pk_t *prkey;
  char digest[DIGEST_LEN];
  char v3_digest[DIGEST_LEN];
  const or_options_t *options = get_options();
  dirinfo_type_t type;
  time_t now = time(NULL);
  dir_server_t *ds;
  int v3_digest_set = 0;
  authority_cert_t *cert = NULL;

  if (!key_lock)
    key_lock = tor_mutex_new();

  /* There are a couple of paths that put us here before we've asked
   * openssl to initialize itself. */
  if (crypto_global_init(get_options()->HardwareAccel,
                         get_options()->AccelName,
                         get_options()->AccelDir)) {
    log_err(LD_BUG, "Unable to initialize OpenSSL. Exiting.");
    return -1;
  }

  /* OP's don't need persistent keys; just make up an identity and
   * initialize the TLS context. */
  if (!server_mode(options)) {
    if (!(prkey = crypto_pk_new()))
      return -1;
    if (crypto_pk_generate_key(prkey)) {
      crypto_pk_free(prkey);
      return -1;
    }
    set_client_identity_key(prkey);
    /* Create a TLS context. */
    if (router_initialize_tls_context() < 0) {
      log_err(LD_GENERAL,"Error creating TLS context for Tor client.");
      return -1;
    }
    return 0;
  }
  /* Make sure DataDirectory exists, and is private. */
  if (check_private_dir(options->DataDirectory, CPD_CREATE, options->User)) {
    return -1;
  }
  /* Check the key directory. */
  keydir = get_datadir_fname("keys");
  if (check_private_dir(keydir, CPD_CREATE, options->User)) {
    tor_free(keydir);
    return -1;
  }
  tor_free(keydir);

  /* 1a. Read v3 directory authority key/cert information. */
  memset(v3_digest, 0, sizeof(v3_digest));
  if (authdir_mode_v3(options)) {
    if (init_v3_authority_keys()<0) {
      log_err(LD_GENERAL, "We're configured as a V3 authority, but we "
              "were unable to load our v3 authority keys and certificate! "
              "Use tor-gencert to generate them. Dying.");
      return -1;
    }
    cert = get_my_v3_authority_cert();
    if (cert) {
      crypto_pk_get_digest(get_my_v3_authority_cert()->identity_key,
                           v3_digest);
      v3_digest_set = 1;
    }
  }

  /* 1b. Read identity key. Make it if none is found. */
  keydir = get_datadir_fname2("keys", "secret_id_key");
  log_info(LD_GENERAL,"Reading/making identity key \"%s\"...",keydir);
  prkey = init_key_from_file(keydir, 1, LOG_ERR);
  tor_free(keydir);
  if (!prkey) return -1;
  set_server_identity_key(prkey);

  /* 1c. If we are configured as a bridge, generate a client key;
   * otherwise, set the server identity key as our client identity
   * key. */
  if (public_server_mode(options)) {
    set_client_identity_key(crypto_pk_dup_key(prkey)); /* set above */
  } else {
    if (!(prkey = crypto_pk_new()))
      return -1;
    if (crypto_pk_generate_key(prkey)) {
      crypto_pk_free(prkey);
      return -1;
    }
    set_client_identity_key(prkey);
  }

  /* 2. Read onion key.  Make it if none is found. */
  keydir = get_datadir_fname2("keys", "secret_onion_key");
  log_info(LD_GENERAL,"Reading/making onion key \"%s\"...",keydir);
  prkey = init_key_from_file(keydir, 1, LOG_ERR);
  tor_free(keydir);
  if (!prkey) return -1;
  set_onion_key(prkey);
  if (options->command == CMD_RUN_TOR) {
    /* only mess with the state file if we're actually running Tor */
    or_state_t *state = get_or_state();
    if (state->LastRotatedOnionKey > 100 && state->LastRotatedOnionKey < now) {
      /* We allow for some parsing slop, but we don't want to risk accepting
       * values in the distant future.  If we did, we might never rotate the
       * onion key. */
      onionkey_set_at = state->LastRotatedOnionKey;
    } else {
      /* We have no LastRotatedOnionKey set; either we just created the key
       * or it's a holdover from 0.1.2.4-alpha-dev or earlier.  In either case,
       * start the clock ticking now so that we will eventually rotate it even
       * if we don't stay up for a full MIN_ONION_KEY_LIFETIME. */
      state->LastRotatedOnionKey = onionkey_set_at = now;
      or_state_mark_dirty(state, options->AvoidDiskWrites ?
                                   time(NULL)+3600 : 0);
    }
  }

  keydir = get_datadir_fname2("keys", "secret_onion_key.old");
  if (!lastonionkey && file_status(keydir) == FN_FILE) {
    prkey = init_key_from_file(keydir, 1, LOG_ERR); /* XXXX Why 1? */
    if (prkey)
      lastonionkey = prkey;
  }
  tor_free(keydir);

#ifdef CURVE25519_ENABLED
  {
    /* 2b. Load curve25519 onion keys. */
    int r;
    keydir = get_datadir_fname2("keys", "secret_onion_key_ntor");
    r = init_curve25519_keypair_from_file(&curve25519_onion_key,
                                          keydir, 1, LOG_ERR, "onion");
    tor_free(keydir);
    if (r<0)
      return -1;

    keydir = get_datadir_fname2("keys", "secret_onion_key_ntor.old");
    if (tor_mem_is_zero((const char *)
                           last_curve25519_onion_key.pubkey.public_key,
                        CURVE25519_PUBKEY_LEN) &&
        file_status(keydir) == FN_FILE) {
      init_curve25519_keypair_from_file(&last_curve25519_onion_key,
                                        keydir, 0, LOG_ERR, "onion");
    }
    tor_free(keydir);
  }
#endif

  /* 3. Initialize link key and TLS context. */
  if (router_initialize_tls_context() < 0) {
    log_err(LD_GENERAL,"Error initializing TLS context");
    return -1;
  }

  /* 4. Build our router descriptor. */
  /* Must be called after keys are initialized. */
  mydesc = router_get_my_descriptor();
  if (authdir_mode_handles_descs(options, ROUTER_PURPOSE_GENERAL)) {
    const char *m = NULL;
    routerinfo_t *ri;
    /* We need to add our own fingerprint so it gets recognized. */
    if (dirserv_add_own_fingerprint(options->Nickname,
                                    get_server_identity_key())) {
      log_err(LD_GENERAL,"Error adding own fingerprint to approved set");
      return -1;
    }
    if (mydesc) {
      was_router_added_t added;
      ri = router_parse_entry_from_string(mydesc, NULL, 1, 0, NULL);
      if (!ri) {
        log_err(LD_GENERAL,"Generated a routerinfo we couldn't parse.");
        return -1;
      }
      added = dirserv_add_descriptor(ri, &m, "self");
      if (!WRA_WAS_ADDED(added)) {
        if (!WRA_WAS_OUTDATED(added)) {
          log_err(LD_GENERAL, "Unable to add own descriptor to directory: %s",
                  m?m:"<unknown error>");
          return -1;
        } else {
          /* If the descriptor was outdated, that's ok. This can happen
           * when some config options are toggled that affect workers, but
           * we don't really need new keys yet so the descriptor doesn't
           * change and the old one is still fresh. */
          log_info(LD_GENERAL, "Couldn't add own descriptor to directory "
                   "after key init: %s This is usually not a problem.",
                   m?m:"<unknown error>");
        }
      }
    }
  }

  /* 5. Dump fingerprint and possibly hashed fingerprint to files. */
  if (router_write_fingerprint(0)) {
    log_err(LD_FS, "Error writing fingerprint to file");
    return -1;
  }
  if (!public_server_mode(options) && router_write_fingerprint(1)) {
    log_err(LD_FS, "Error writing hashed fingerprint to file");
    return -1;
  }

  if (!authdir_mode(options))
    return 0;
  /* 6. [authdirserver only] load approved-routers file */
  if (dirserv_load_fingerprint_file() < 0) {
    log_err(LD_GENERAL,"Error loading fingerprints");
    return -1;
  }
  /* 6b. [authdirserver only] add own key to approved directories. */
  crypto_pk_get_digest(get_server_identity_key(), digest);
  type = ((options->V3AuthoritativeDir ?
               (V3_DIRINFO|MICRODESC_DIRINFO|EXTRAINFO_DIRINFO) : NO_DIRINFO) |
          (options->BridgeAuthoritativeDir ? BRIDGE_DIRINFO : NO_DIRINFO));

  ds = router_get_trusteddirserver_by_digest(digest);
  if (!ds) {
    ds = trusted_dir_server_new(options->Nickname, NULL,
                                router_get_advertised_dir_port(options, 0),
                                router_get_advertised_or_port(options),
                                digest,
                                v3_digest,
                                type, 0.0);
    if (!ds) {
      log_err(LD_GENERAL,"We want to be a directory authority, but we "
              "couldn't add ourselves to the authority list. Failing.");
      return -1;
    }
    dir_server_add(ds);
  }
  if (ds->type != type) {
    log_warn(LD_DIR,  "Configured authority type does not match authority "
             "type in DirAuthority list.  Adjusting. (%d v %d)",
             type, ds->type);
    ds->type = type;
  }
  if (v3_digest_set && (ds->type & V3_DIRINFO) &&
      tor_memneq(v3_digest, ds->v3_identity_digest, DIGEST_LEN)) {
    log_warn(LD_DIR, "V3 identity key does not match identity declared in "
             "DirAuthority line.  Adjusting.");
    memcpy(ds->v3_identity_digest, v3_digest, DIGEST_LEN);
  }

  if (cert) { /* add my own cert to the list of known certs */
    log_info(LD_DIR, "adding my own v3 cert");
    if (trusted_dirs_load_certs_from_string(
                      cert->cache_info.signed_descriptor_body,
                      TRUSTED_DIRS_CERTS_SRC_SELF, 0)<0) {
      log_warn(LD_DIR, "Unable to parse my own v3 cert! Failing.");
      return -1;
    }
  }

  return 0; /* success */
}

/* Keep track of whether we should upload our server descriptor,
 * and what type of server we are.
 */

/** Whether we can reach our ORPort from the outside. */
static int can_reach_or_port = 0;
/** Whether we can reach our DirPort from the outside. */
static int can_reach_dir_port = 0;

/** Forget what we have learned about our reachability status. */
void
router_reset_reachability(void)
{
  can_reach_or_port = can_reach_dir_port = 0;
}

/** Return 1 if ORPort is known reachable; else return 0. */
int
check_whether_orport_reachable(void)
{
  const or_options_t *options = get_options();
  return options->AssumeReachable ||
         can_reach_or_port;
}

/** Return 1 if we don't have a dirport configured, or if it's reachable. */
int
check_whether_dirport_reachable(void)
{
  const or_options_t *options = get_options();
  return !options->DirPort_set ||
         options->AssumeReachable ||
         net_is_disabled() ||
         can_reach_dir_port;
}

/** Look at a variety of factors, and return 0 if we don't want to
 * advertise the fact that we have a DirPort open. Else return the
 * DirPort we want to advertise.
 *
 * Log a helpful message if we change our mind about whether to publish
 * a DirPort.
 */
static int
decide_to_advertise_dirport(const or_options_t *options, uint16_t dir_port)
{
  static int advertising=1; /* start out assuming we will advertise */
  int new_choice=1;
  const char *reason = NULL;

  /* Section one: reasons to publish or not publish that aren't
   * worth mentioning to the user, either because they're obvious
   * or because they're normal behavior. */

  if (!dir_port) /* short circuit the rest of the function */
    return 0;
  if (authdir_mode(options)) /* always publish */
    return dir_port;
  if (net_is_disabled())
    return 0;
  if (!check_whether_dirport_reachable())
    return 0;
  if (!router_get_advertised_dir_port(options, dir_port))
    return 0;

  /* Section two: reasons to publish or not publish that the user
   * might find surprising. These are generally config options that
   * make us choose not to publish. */

  if (accounting_is_enabled(options)) {
    /* Don't spend bytes for directory traffic if we could end up hibernating,
     * but allow DirPort otherwise. Some people set AccountingMax because
     * they're confused or to get statistics. */
    int interval_length = accounting_get_interval_length();
    uint32_t effective_bw = get_effective_bwrate(options);
    if (!interval_length) {
      log_warn(LD_BUG, "An accounting interval is not allowed to be zero "
                       "seconds long. Raising to 1.");
      interval_length = 1;
    }
    log_info(LD_GENERAL, "Calculating whether to disable dirport: effective "
                         "bwrate: %u, AccountingMax: "U64_FORMAT", "
                         "accounting interval length %d", effective_bw,
                         U64_PRINTF_ARG(options->AccountingMax),
                         interval_length);
    if (effective_bw >=
        options->AccountingMax / interval_length) {
      new_choice = 0;
      reason = "AccountingMax enabled";
    }
#define MIN_BW_TO_ADVERTISE_DIRPORT 51200
  } else if (options->BandwidthRate < MIN_BW_TO_ADVERTISE_DIRPORT ||
             (options->RelayBandwidthRate > 0 &&
              options->RelayBandwidthRate < MIN_BW_TO_ADVERTISE_DIRPORT)) {
    /* if we're advertising a small amount */
    new_choice = 0;
    reason = "BandwidthRate under 50KB";
  }

  if (advertising != new_choice) {
    if (new_choice == 1) {
      log_notice(LD_DIR, "Advertising DirPort as %d", dir_port);
    } else {
      tor_assert(reason);
      log_notice(LD_DIR, "Not advertising DirPort (Reason: %s)", reason);
    }
    advertising = new_choice;
  }

  return advertising ? dir_port : 0;
}

/** Allocate and return a new extend_info_t that can be used to build
 * a circuit to or through the router <b>r</b>. Use the primary
 * address of the router unless <b>for_direct_connect</b> is true, in
 * which case the preferred address is used instead. */
static extend_info_t *
extend_info_from_router(const routerinfo_t *r)
{
  tor_addr_port_t ap;
  tor_assert(r);

  router_get_prim_orport(r, &ap);
  return extend_info_new(r->nickname, r->cache_info.identity_digest,
                         r->onion_pkey, r->onion_curve25519_pkey,
                         &ap.addr, ap.port);
}

/** Some time has passed, or we just got new directory information.
 * See if we currently believe our ORPort or DirPort to be
 * unreachable. If so, launch a new test for it.
 *
 * For ORPort, we simply try making a circuit that ends at ourselves.
 * Success is noticed in onionskin_answer().
 *
 * For DirPort, we make a connection via Tor to our DirPort and ask
 * for our own server descriptor.
 * Success is noticed in connection_dir_client_reached_eof().
 */
void
consider_testing_reachability(int test_or, int test_dir)
{
  const routerinfo_t *me = router_get_my_routerinfo();
  int orport_reachable = check_whether_orport_reachable();
  tor_addr_t addr;
  const or_options_t *options = get_options();
  if (!me)
    return;

  if (routerset_contains_router(options->ExcludeNodes, me, -1) &&
      options->StrictNodes) {
    /* If we've excluded ourself, and StrictNodes is set, we can't test
     * ourself. */
    if (test_or || test_dir) {
#define SELF_EXCLUDED_WARN_INTERVAL 3600
      static ratelim_t warning_limit=RATELIM_INIT(SELF_EXCLUDED_WARN_INTERVAL);
      log_fn_ratelim(&warning_limit, LOG_WARN, LD_CIRC,
                 "Can't peform self-tests for this relay: we have "
                 "listed ourself in ExcludeNodes, and StrictNodes is set. "
                 "We cannot learn whether we are usable, and will not "
                 "be able to advertise ourself.");
    }
    return;
  }

  if (test_or && (!orport_reachable || !circuit_enough_testing_circs())) {
    extend_info_t *ei = extend_info_from_router(me);
    /* XXX IPv6 self testing */
    log_info(LD_CIRC, "Testing %s of my ORPort: %s:%d.",
             !orport_reachable ? "reachability" : "bandwidth",
             fmt_addr32(me->addr), me->or_port);
    circuit_launch_by_extend_info(CIRCUIT_PURPOSE_TESTING, ei,
                            CIRCLAUNCH_NEED_CAPACITY|CIRCLAUNCH_IS_INTERNAL);
    extend_info_free(ei);
  }

  tor_addr_from_ipv4h(&addr, me->addr);
  if (test_dir && !check_whether_dirport_reachable() &&
      !connection_get_by_type_addr_port_purpose(
                CONN_TYPE_DIR, &addr, me->dir_port,
                DIR_PURPOSE_FETCH_SERVERDESC)) {
    /* ask myself, via tor, for my server descriptor. */
    directory_initiate_command(&addr,
                               me->or_port, me->dir_port,
                               me->cache_info.identity_digest,
                               DIR_PURPOSE_FETCH_SERVERDESC,
                               ROUTER_PURPOSE_GENERAL,
                               DIRIND_ANON_DIRPORT, "authority.z", NULL, 0, 0);
  }
}

/** Annotate that we found our ORPort reachable. */
void
router_orport_found_reachable(void)
{
  const routerinfo_t *me = router_get_my_routerinfo();
  if (!can_reach_or_port && me) {
    char *address = tor_dup_ip(me->addr);
    log_notice(LD_OR,"Self-testing indicates your ORPort is reachable from "
               "the outside. Excellent.%s",
               get_options()->PublishServerDescriptor_ != NO_DIRINFO ?
                 " Publishing server descriptor." : "");
    can_reach_or_port = 1;
    mark_my_descriptor_dirty("ORPort found reachable");
    control_event_server_status(LOG_NOTICE,
                                "REACHABILITY_SUCCEEDED ORADDRESS=%s:%d",
                                address, me->or_port);
    tor_free(address);
  }
}

/** Annotate that we found our DirPort reachable. */
void
router_dirport_found_reachable(void)
{
  const routerinfo_t *me = router_get_my_routerinfo();
  if (!can_reach_dir_port && me) {
    char *address = tor_dup_ip(me->addr);
    log_notice(LD_DIRSERV,"Self-testing indicates your DirPort is reachable "
               "from the outside. Excellent.");
    can_reach_dir_port = 1;
    if (decide_to_advertise_dirport(get_options(), me->dir_port))
      mark_my_descriptor_dirty("DirPort found reachable");
    control_event_server_status(LOG_NOTICE,
                                "REACHABILITY_SUCCEEDED DIRADDRESS=%s:%d",
                                address, me->dir_port);
    tor_free(address);
  }
}

/** We have enough testing circuits open. Send a bunch of "drop"
 * cells down each of them, to exercise our bandwidth. */
void
router_perform_bandwidth_test(int num_circs, time_t now)
{
  int num_cells = (int)(get_options()->BandwidthRate * 10 /
                        CELL_MAX_NETWORK_SIZE);
  int max_cells = num_cells < CIRCWINDOW_START ?
                    num_cells : CIRCWINDOW_START;
  int cells_per_circuit = max_cells / num_circs;
  origin_circuit_t *circ = NULL;

  log_notice(LD_OR,"Performing bandwidth self-test...done.");
  while ((circ = circuit_get_next_by_pk_and_purpose(circ, NULL,
                                              CIRCUIT_PURPOSE_TESTING))) {
    /* dump cells_per_circuit drop cells onto this circ */
    int i = cells_per_circuit;
    if (circ->base_.state != CIRCUIT_STATE_OPEN)
      continue;
    circ->base_.timestamp_dirty = now;
    while (i-- > 0) {
      if (relay_send_command_from_edge(0, TO_CIRCUIT(circ),
                                       RELAY_COMMAND_DROP,
                                       NULL, 0, circ->cpath->prev)<0) {
        return; /* stop if error */
      }
    }
  }
}

/** Return true iff our network is in some sense disabled: either we're
 * hibernating, entering hibernation, or */
int
net_is_disabled(void)
{
  return get_options()->DisableNetwork || we_are_hibernating();
}

/** Return true iff we believe ourselves to be an authoritative
 * directory server.
 */
int
authdir_mode(const or_options_t *options)
{
  return options->AuthoritativeDir != 0;
}
/** Return true iff we believe ourselves to be a v3 authoritative
 * directory server.
 */
int
authdir_mode_v3(const or_options_t *options)
{
  return authdir_mode(options) && options->V3AuthoritativeDir != 0;
}
/** Return true iff we are a v3 directory authority. */
int
authdir_mode_any_main(const or_options_t *options)
{
  return options->V3AuthoritativeDir;
}
/** Return true if we believe ourselves to be any kind of
 * authoritative directory beyond just a hidserv authority. */
int
authdir_mode_any_nonhidserv(const or_options_t *options)
{
  return options->BridgeAuthoritativeDir ||
         authdir_mode_any_main(options);
}
/** Return true iff we are an authoritative directory server that is
 * authoritative about receiving and serving descriptors of type
 * <b>purpose</b> on its dirport.  Use -1 for "any purpose". */
int
authdir_mode_handles_descs(const or_options_t *options, int purpose)
{
  if (purpose < 0)
    return authdir_mode_any_nonhidserv(options);
  else if (purpose == ROUTER_PURPOSE_GENERAL)
    return authdir_mode_any_main(options);
  else if (purpose == ROUTER_PURPOSE_BRIDGE)
    return (options->BridgeAuthoritativeDir);
  else
    return 0;
}
/** Return true iff we are an authoritative directory server that
 * publishes its own network statuses.
 */
int
authdir_mode_publishes_statuses(const or_options_t *options)
{
  if (authdir_mode_bridge(options))
    return 0;
  return authdir_mode_any_nonhidserv(options);
}
/** Return true iff we are an authoritative directory server that
 * tests reachability of the descriptors it learns about.
 */
int
authdir_mode_tests_reachability(const or_options_t *options)
{
  return authdir_mode_handles_descs(options, -1);
}
/** Return true iff we believe ourselves to be a bridge authoritative
 * directory server.
 */
int
authdir_mode_bridge(const or_options_t *options)
{
  return authdir_mode(options) && options->BridgeAuthoritativeDir != 0;
}

/** Return true iff we are trying to be a server.
 */
int
server_mode(const or_options_t *options)
{
  if (options->ClientOnly) return 0;
  /* XXXX024 I believe we can kill off ORListenAddress here.*/
  return (options->ORPort_set || options->ORListenAddress);
}

/** Return true iff we are trying to be a non-bridge server.
 */
int
public_server_mode(const or_options_t *options)
{
  if (!server_mode(options)) return 0;
  return (!options->BridgeRelay);
}

/** Return true iff the combination of options in <b>options</b> and parameters
 * in the consensus mean that we don't want to allow exits from circuits
 * we got from addresses not known to be servers. */
int
should_refuse_unknown_exits(const or_options_t *options)
{
  if (options->RefuseUnknownExits != -1) {
    return options->RefuseUnknownExits;
  } else {
    return networkstatus_get_param(NULL, "refuseunknownexits", 1, 0, 1);
  }
}

/** Remember if we've advertised ourselves to the dirservers. */
static int server_is_advertised=0;

/** Return true iff we have published our descriptor lately.
 */
int
advertised_server_mode(void)
{
  return server_is_advertised;
}

/**
 * Called with a boolean: set whether we have recently published our
 * descriptor.
 */
static void
set_server_advertised(int s)
{
  server_is_advertised = s;
}

/** Return true iff we are trying to proxy client connections. */
int
proxy_mode(const or_options_t *options)
{
  (void)options;
  SMARTLIST_FOREACH_BEGIN(get_configured_ports(), const port_cfg_t *, p) {
    if (p->type == CONN_TYPE_AP_LISTENER ||
        p->type == CONN_TYPE_AP_TRANS_LISTENER ||
        p->type == CONN_TYPE_AP_DNS_LISTENER ||
        p->type == CONN_TYPE_AP_NATD_LISTENER)
      return 1;
  } SMARTLIST_FOREACH_END(p);
  return 0;
}

/** Decide if we're a publishable server. We are a publishable server if:
 * - We don't have the ClientOnly option set
 * and
 * - We have the PublishServerDescriptor option set to non-empty
 * and
 * - We have ORPort set
 * and
 * - We believe we are reachable from the outside; or
 * - We are an authoritative directory server.
 */
static int
decide_if_publishable_server(void)
{
  const or_options_t *options = get_options();

  if (options->ClientOnly)
    return 0;
  if (options->PublishServerDescriptor_ == NO_DIRINFO)
    return 0;
  if (!server_mode(options))
    return 0;
  if (authdir_mode(options))
    return 1;
  if (!router_get_advertised_or_port(options))
    return 0;

  return check_whether_orport_reachable();
}

/** Initiate server descriptor upload as reasonable (if server is publishable,
 * etc).  <b>force</b> is as for router_upload_dir_desc_to_dirservers.
 *
 * We need to rebuild the descriptor if it's dirty even if we're not
 * uploading, because our reachability testing *uses* our descriptor to
 * determine what IP address and ports to test.
 */
void
consider_publishable_server(int force)
{
  int rebuilt;

  if (!server_mode(get_options()))
    return;

  rebuilt = router_rebuild_descriptor(0);
  if (decide_if_publishable_server()) {
    set_server_advertised(1);
    if (rebuilt == 0)
      router_upload_dir_desc_to_dirservers(force);
  } else {
    set_server_advertised(0);
  }
}

/** Return the port of the first active listener of type
 *  <b>listener_type</b>. */
/** XXX not a very good interface. it's not reliable when there are
    multiple listeners. */
uint16_t
router_get_active_listener_port_by_type_af(int listener_type,
                                           sa_family_t family)
{
  /* Iterate all connections, find one of the right kind and return
     the port. Not very sophisticated or fast, but effective. */
  smartlist_t *conns = get_connection_array();
  SMARTLIST_FOREACH_BEGIN(conns, connection_t *, conn) {
    if (conn->type == listener_type && !conn->marked_for_close &&
        conn->socket_family == family) {
      return conn->port;
    }
  } SMARTLIST_FOREACH_END(conn);

  return 0;
}

/** Return the port that we should advertise as our ORPort; this is either
 * the one configured in the ORPort option, or the one we actually bound to
 * if ORPort is "auto".
 */
uint16_t
router_get_advertised_or_port(const or_options_t *options)
{
  return router_get_advertised_or_port_by_af(options, AF_INET);
}

/** As router_get_advertised_or_port(), but allows an address family argument.
 */
uint16_t
router_get_advertised_or_port_by_af(const or_options_t *options,
                                    sa_family_t family)
{
  int port = get_first_advertised_port_by_type_af(CONN_TYPE_OR_LISTENER,
                                                  family);
  (void)options;

  /* If the port is in 'auto' mode, we have to use
     router_get_listener_port_by_type(). */
  if (port == CFG_AUTO_PORT)
    return router_get_active_listener_port_by_type_af(CONN_TYPE_OR_LISTENER,
                                                      family);

  return port;
}

/** Return the port that we should advertise as our DirPort;
 * this is one of three possibilities:
 * The one that is passed as <b>dirport</b> if the DirPort option is 0, or
 * the one configured in the DirPort option,
 * or the one we actually bound to if DirPort is "auto". */
uint16_t
router_get_advertised_dir_port(const or_options_t *options, uint16_t dirport)
{
  int dirport_configured = get_primary_dir_port();
  (void)options;

  if (!dirport_configured)
    return dirport;

  if (dirport_configured == CFG_AUTO_PORT)
    return router_get_active_listener_port_by_type_af(CONN_TYPE_DIR_LISTENER,
                                                      AF_INET);

  return dirport_configured;
}

/*
 * OR descriptor generation.
 */

/** My routerinfo. */
static routerinfo_t *desc_routerinfo = NULL;
/** My extrainfo */
static extrainfo_t *desc_extrainfo = NULL;
/** Why did we most recently decide to regenerate our descriptor?  Used to
 * tell the authorities why we're sending it to them. */
static const char *desc_gen_reason = NULL;
/** Since when has our descriptor been "clean"?  0 if we need to regenerate it
 * now. */
static time_t desc_clean_since = 0;
/** Why did we mark the descriptor dirty? */
static const char *desc_dirty_reason = NULL;
/** Boolean: do we need to regenerate the above? */
static int desc_needs_upload = 0;

/** OR only: If <b>force</b> is true, or we haven't uploaded this
 * descriptor successfully yet, try to upload our signed descriptor to
 * all the directory servers we know about.
 */
void
router_upload_dir_desc_to_dirservers(int force)
{
  const routerinfo_t *ri;
  extrainfo_t *ei;
  char *msg;
  size_t desc_len, extra_len = 0, total_len;
  dirinfo_type_t auth = get_options()->PublishServerDescriptor_;

  ri = router_get_my_routerinfo();
  if (!ri) {
    log_info(LD_GENERAL, "No descriptor; skipping upload");
    return;
  }
  ei = router_get_my_extrainfo();
  if (auth == NO_DIRINFO)
    return;
  if (!force && !desc_needs_upload)
    return;

  log_info(LD_OR, "Uploading relay descriptor to directory authorities%s",
           force ? " (forced)" : "");

  desc_needs_upload = 0;

  desc_len = ri->cache_info.signed_descriptor_len;
  extra_len = ei ? ei->cache_info.signed_descriptor_len : 0;
  total_len = desc_len + extra_len + 1;
  msg = tor_malloc(total_len);
  memcpy(msg, ri->cache_info.signed_descriptor_body, desc_len);
  if (ei) {
    memcpy(msg+desc_len, ei->cache_info.signed_descriptor_body, extra_len);
  }
  msg[desc_len+extra_len] = 0;

  directory_post_to_dirservers(DIR_PURPOSE_UPLOAD_DIR,
                               (auth & BRIDGE_DIRINFO) ?
                                 ROUTER_PURPOSE_BRIDGE :
                                 ROUTER_PURPOSE_GENERAL,
                               auth, msg, desc_len, extra_len);
  tor_free(msg);
}

/** OR only: Check whether my exit policy says to allow connection to
 * conn.  Return 0 if we accept; non-0 if we reject.
 */
int
router_compare_to_my_exit_policy(const tor_addr_t *addr, uint16_t port)
{
  if (!router_get_my_routerinfo()) /* make sure desc_routerinfo exists */
    return -1;

  /* make sure it's resolved to something. this way we can't get a
     'maybe' below. */
  if (tor_addr_is_null(addr))
    return -1;

  /* look at desc_routerinfo->exit_policy for both the v4 and the v6
   * policies.  The exit_policy field in desc_routerinfo is a bit unusual,
   * in that it contains IPv6 and IPv6 entries.  We don't want to look
   * at desc_routerinfio->ipv6_exit_policy, since that's a port summary. */
  if ((tor_addr_family(addr) == AF_INET ||
       tor_addr_family(addr) == AF_INET6)) {
    return compare_tor_addr_to_addr_policy(addr, port,
                    desc_routerinfo->exit_policy) != ADDR_POLICY_ACCEPTED;
#if 0
  } else if (tor_addr_family(addr) == AF_INET6) {
    return get_options()->IPv6Exit &&
      desc_routerinfo->ipv6_exit_policy &&
      compare_tor_addr_to_short_policy(addr, port,
                  desc_routerinfo->ipv6_exit_policy) != ADDR_POLICY_ACCEPTED;
#endif
  } else {
    return -1;
  }
}

/** Return true iff my exit policy is reject *:*.  Return -1 if we don't
 * have a descriptor */
int
router_my_exit_policy_is_reject_star(void)
{
  if (!router_get_my_routerinfo()) /* make sure desc_routerinfo exists */
    return -1;

  return desc_routerinfo->policy_is_reject_star;
}

/** Return true iff I'm a server and <b>digest</b> is equal to
 * my server identity key digest. */
int
router_digest_is_me(const char *digest)
{
  return (server_identitykey &&
          tor_memeq(server_identitykey_digest, digest, DIGEST_LEN));
}

/** Return my identity digest. */
const uint8_t *
router_get_my_id_digest(void)
{
  return (const uint8_t *)server_identitykey_digest;
}

/** Return true iff I'm a server and <b>digest</b> is equal to
 * my identity digest. */
int
router_extrainfo_digest_is_me(const char *digest)
{
  extrainfo_t *ei = router_get_my_extrainfo();
  if (!ei)
    return 0;

  return tor_memeq(digest,
                 ei->cache_info.signed_descriptor_digest,
                 DIGEST_LEN);
}

/** A wrapper around router_digest_is_me(). */
int
router_is_me(const routerinfo_t *router)
{
  return router_digest_is_me(router->cache_info.identity_digest);
}

/** Return a routerinfo for this OR, rebuilding a fresh one if
 * necessary.  Return NULL on error, or if called on an OP. */
const routerinfo_t *
router_get_my_routerinfo(void)
{
  if (!server_mode(get_options()))
    return NULL;
  if (router_rebuild_descriptor(0))
    return NULL;
  return desc_routerinfo;
}

/** OR only: Return a signed server descriptor for this OR, rebuilding a fresh
 * one if necessary.  Return NULL on error.
 */
const char *
router_get_my_descriptor(void)
{
  const char *body;
  if (!router_get_my_routerinfo())
    return NULL;
  /* Make sure this is nul-terminated. */
  tor_assert(desc_routerinfo->cache_info.saved_location == SAVED_NOWHERE);
  body = signed_descriptor_get_body(&desc_routerinfo->cache_info);
  tor_assert(!body[desc_routerinfo->cache_info.signed_descriptor_len]);
  log_debug(LD_GENERAL,"my desc is '%s'", body);
  return body;
}

/** Return the extrainfo document for this OR, or NULL if we have none.
 * Rebuilt it (and the server descriptor) if necessary. */
extrainfo_t *
router_get_my_extrainfo(void)
{
  if (!server_mode(get_options()))
    return NULL;
  if (router_rebuild_descriptor(0))
    return NULL;
  return desc_extrainfo;
}

/** Return a human-readable string describing what triggered us to generate
 * our current descriptor, or NULL if we don't know. */
const char *
router_get_descriptor_gen_reason(void)
{
  return desc_gen_reason;
}

/** A list of nicknames that we've warned about including in our family
 * declaration verbatim rather than as digests. */
static smartlist_t *warned_nonexistent_family = NULL;

static int router_guess_address_from_dir_headers(uint32_t *guess);

/** Make a current best guess at our address, either because
 * it's configured in torrc, or because we've learned it from
 * dirserver headers. Place the answer in *<b>addr</b> and return
 * 0 on success, else return -1 if we have no guess. */
int
router_pick_published_address(const or_options_t *options, uint32_t *addr)
{
  *addr = get_last_resolved_addr();
  if (!*addr &&
      resolve_my_address(LOG_INFO, options, addr, NULL, NULL) < 0) {
    log_info(LD_CONFIG, "Could not determine our address locally. "
             "Checking if directory headers provide any hints.");
    if (router_guess_address_from_dir_headers(addr) < 0) {
      log_info(LD_CONFIG, "No hints from directory headers either. "
               "Will try again later.");
      return -1;
    }
  }
  log_info(LD_CONFIG,"Success: chose address '%s'.", fmt_addr32(*addr));
  return 0;
}

/** If <b>force</b> is true, or our descriptor is out-of-date, rebuild a fresh
 * routerinfo, signed server descriptor, and extra-info document for this OR.
 * Return 0 on success, -1 on temporary error.
 */
int
router_rebuild_descriptor(int force)
{
  routerinfo_t *ri;
  extrainfo_t *ei;
  uint32_t addr;
  char platform[256];
  int hibernating = we_are_hibernating();
  const or_options_t *options = get_options();

  if (desc_clean_since && !force)
    return 0;

  if (router_pick_published_address(options, &addr) < 0 ||
      router_get_advertised_or_port(options) == 0) {
    /* Stop trying to rebuild our descriptor every second. We'll
     * learn that it's time to try again when ip_address_changed()
     * marks it dirty. */
    desc_clean_since = time(NULL);
    return -1;
  }

  log_info(LD_OR, "Rebuilding relay descriptor%s", force ? " (forced)" : "");

  ri = tor_malloc_zero(sizeof(routerinfo_t));
  ri->cache_info.routerlist_index = -1;
  ri->nickname = tor_strdup(options->Nickname);
  ri->addr = addr;
  ri->or_port = router_get_advertised_or_port(options);
  ri->dir_port = router_get_advertised_dir_port(options, 0);
  ri->cache_info.published_on = time(NULL);
  ri->onion_pkey = crypto_pk_dup_key(get_onion_key()); /* must invoke from
                                                        * main thread */
#ifdef CURVE25519_ENABLED
  ri->onion_curve25519_pkey =
    tor_memdup(&get_current_curve25519_keypair()->pubkey,
               sizeof(curve25519_public_key_t));
#endif

  /* For now, at most one IPv6 or-address is being advertised. */
  {
    const port_cfg_t *ipv6_orport = NULL;
    SMARTLIST_FOREACH_BEGIN(get_configured_ports(), const port_cfg_t *, p) {
      if (p->type == CONN_TYPE_OR_LISTENER &&
          ! p->no_advertise &&
          ! p->bind_ipv4_only &&
          tor_addr_family(&p->addr) == AF_INET6) {
        if (! tor_addr_is_internal(&p->addr, 0)) {
          ipv6_orport = p;
          break;
        } else {
          char addrbuf[TOR_ADDR_BUF_LEN];
          log_warn(LD_CONFIG,
                   "Unable to use configured IPv6 address \"%s\" in a "
                   "descriptor. Skipping it. "
                   "Try specifying a globally reachable address explicitly. ",
                   tor_addr_to_str(addrbuf, &p->addr, sizeof(addrbuf), 1));
        }
      }
    } SMARTLIST_FOREACH_END(p);
    if (ipv6_orport) {
      tor_addr_copy(&ri->ipv6_addr, &ipv6_orport->addr);
      ri->ipv6_orport = ipv6_orport->port;
    }
  }

  ri->identity_pkey = crypto_pk_dup_key(get_server_identity_key());
  if (crypto_pk_get_digest(ri->identity_pkey,
                           ri->cache_info.identity_digest)<0) {
    routerinfo_free(ri);
    return -1;
  }
  get_platform_str(platform, sizeof(platform));
  ri->platform = tor_strdup(platform);

  /* compute ri->bandwidthrate as the min of various options */
  ri->bandwidthrate = get_effective_bwrate(options);

  /* and compute ri->bandwidthburst similarly */
  ri->bandwidthburst = get_effective_bwburst(options);

  ri->bandwidthcapacity = hibernating ? 0 : rep_hist_bandwidth_assess();

  if (dns_seems_to_be_broken() || has_dns_init_failed()) {
    /* DNS is screwed up; don't claim to be an exit. */
    policies_exit_policy_append_reject_star(&ri->exit_policy);
  } else {
    policies_parse_exit_policy(options->ExitPolicy, &ri->exit_policy,
                               options->IPv6Exit,
                               options->ExitPolicyRejectPrivate,
                               ri->addr, !options->BridgeRelay);
  }
  ri->policy_is_reject_star =
    policy_is_reject_star(ri->exit_policy, AF_INET) &&
    policy_is_reject_star(ri->exit_policy, AF_INET6);

  if (options->IPv6Exit) {
    char *p_tmp = policy_summarize(ri->exit_policy, AF_INET6);
    if (p_tmp)
      ri->ipv6_exit_policy = parse_short_policy(p_tmp);
    tor_free(p_tmp);
  }

  if (options->MyFamily && ! options->BridgeRelay) {
    smartlist_t *family;
    if (!warned_nonexistent_family)
      warned_nonexistent_family = smartlist_new();
    family = smartlist_new();
    ri->declared_family = smartlist_new();
    smartlist_split_string(family, options->MyFamily, ",",
      SPLIT_SKIP_SPACE|SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0);
    SMARTLIST_FOREACH_BEGIN(family, char *, name) {
       const node_t *member;
       if (!strcasecmp(name, options->Nickname))
         goto skip; /* Don't list ourself, that's redundant */
       else
         member = node_get_by_nickname(name, 1);
       if (!member) {
         int is_legal = is_legal_nickname_or_hexdigest(name);
         if (!smartlist_contains_string(warned_nonexistent_family, name) &&
             !is_legal_hexdigest(name)) {
           if (is_legal)
             log_warn(LD_CONFIG,
                      "I have no descriptor for the router named \"%s\" in my "
                      "declared family; I'll use the nickname as is, but "
                      "this may confuse clients.", name);
           else
             log_warn(LD_CONFIG, "There is a router named \"%s\" in my "
                      "declared family, but that isn't a legal nickname. "
                      "Skipping it.", escaped(name));
           smartlist_add(warned_nonexistent_family, tor_strdup(name));
         }
         if (is_legal) {
           smartlist_add(ri->declared_family, name);
           name = NULL;
         }
       } else if (router_digest_is_me(member->identity)) {
         /* Don't list ourself in our own family; that's redundant */
         /* XXX shouldn't be possible */
       } else {
         char *fp = tor_malloc(HEX_DIGEST_LEN+2);
         fp[0] = '$';
         base16_encode(fp+1,HEX_DIGEST_LEN+1,
                       member->identity, DIGEST_LEN);
         smartlist_add(ri->declared_family, fp);
         if (smartlist_contains_string(warned_nonexistent_family, name))
           smartlist_string_remove(warned_nonexistent_family, name);
       }
    skip:
       tor_free(name);
    } SMARTLIST_FOREACH_END(name);

    /* remove duplicates from the list */
    smartlist_sort_strings(ri->declared_family);
    smartlist_uniq_strings(ri->declared_family);

    smartlist_free(family);
  }

  /* Now generate the extrainfo. */
  ei = tor_malloc_zero(sizeof(extrainfo_t));
  ei->cache_info.is_extrainfo = 1;
  strlcpy(ei->nickname, get_options()->Nickname, sizeof(ei->nickname));
  ei->cache_info.published_on = ri->cache_info.published_on;
  memcpy(ei->cache_info.identity_digest, ri->cache_info.identity_digest,
         DIGEST_LEN);
  if (extrainfo_dump_to_string(&ei->cache_info.signed_descriptor_body,
                               ei, get_server_identity_key()) < 0) {
    log_warn(LD_BUG, "Couldn't generate extra-info descriptor.");
    extrainfo_free(ei);
    ei = NULL;
  } else {
    ei->cache_info.signed_descriptor_len =
      strlen(ei->cache_info.signed_descriptor_body);
    router_get_extrainfo_hash(ei->cache_info.signed_descriptor_body,
                              ei->cache_info.signed_descriptor_len,
                              ei->cache_info.signed_descriptor_digest);
  }

  /* Now finish the router descriptor. */
  if (ei) {
    memcpy(ri->cache_info.extra_info_digest,
           ei->cache_info.signed_descriptor_digest,
           DIGEST_LEN);
  } else {
    /* ri was allocated with tor_malloc_zero, so there is no need to
     * zero ri->cache_info.extra_info_digest here. */
  }
  if (! (ri->cache_info.signed_descriptor_body = router_dump_router_to_string(
                                           ri, get_server_identity_key()))) {
    log_warn(LD_BUG, "Couldn't generate router descriptor.");
    routerinfo_free(ri);
    extrainfo_free(ei);
    return -1;
  }
  ri->cache_info.signed_descriptor_len =
    strlen(ri->cache_info.signed_descriptor_body);

  ri->purpose =
    options->BridgeRelay ? ROUTER_PURPOSE_BRIDGE : ROUTER_PURPOSE_GENERAL;
  if (options->BridgeRelay) {
    /* Bridges shouldn't be able to send their descriptors unencrypted,
       anyway, since they don't have a DirPort, and always connect to the
       bridge authority anonymously.  But just in case they somehow think of
       sending them on an unencrypted connection, don't allow them to try. */
    ri->cache_info.send_unencrypted = 0;
    if (ei)
      ei->cache_info.send_unencrypted = 0;
  } else {
    ri->cache_info.send_unencrypted = 1;
    if (ei)
      ei->cache_info.send_unencrypted = 1;
  }

  router_get_router_hash(ri->cache_info.signed_descriptor_body,
                         strlen(ri->cache_info.signed_descriptor_body),
                         ri->cache_info.signed_descriptor_digest);

  if (ei) {
    tor_assert(! routerinfo_incompatible_with_extrainfo(ri, ei, NULL, NULL));
  }

  routerinfo_free(desc_routerinfo);
  desc_routerinfo = ri;
  extrainfo_free(desc_extrainfo);
  desc_extrainfo = ei;

  desc_clean_since = time(NULL);
  desc_needs_upload = 1;
  desc_gen_reason = desc_dirty_reason;
  desc_dirty_reason = NULL;
  control_event_my_descriptor_changed();
  return 0;
}

/** If our router descriptor ever goes this long without being regenerated
 * because something changed, we force an immediate regenerate-and-upload. */
#define FORCE_REGENERATE_DESCRIPTOR_INTERVAL (18*60*60)

/** If our router descriptor seems to be missing or unacceptable according
 * to the authorities, regenerate and reupload it _this_ often. */
#define FAST_RETRY_DESCRIPTOR_INTERVAL (90*60)

/** Mark descriptor out of date if it's been "too long" since we last tried
 * to upload one. */
void
mark_my_descriptor_dirty_if_too_old(time_t now)
{
  networkstatus_t *ns;
  const routerstatus_t *rs;
  const char *retry_fast_reason = NULL; /* Set if we should retry frequently */
  const time_t slow_cutoff = now - FORCE_REGENERATE_DESCRIPTOR_INTERVAL;
  const time_t fast_cutoff = now - FAST_RETRY_DESCRIPTOR_INTERVAL;

  /* If it's already dirty, don't mark it. */
  if (! desc_clean_since)
    return;

  /* If it's older than FORCE_REGENERATE_DESCRIPTOR_INTERVAL, it's always
   * time to rebuild it. */
  if (desc_clean_since < slow_cutoff) {
    mark_my_descriptor_dirty("time for new descriptor");
    return;
  }
  /* Now we see whether we want to be retrying frequently or no.  The
   * rule here is that we'll retry frequently if we aren't listed in the
   * live consensus we have, or if the publication time of the
   * descriptor listed for us in the consensus is very old. */
  ns = networkstatus_get_live_consensus(now);
  if (ns) {
    rs = networkstatus_vote_find_entry(ns, server_identitykey_digest);
    if (rs == NULL)
      retry_fast_reason = "not listed in consensus";
    else if (rs->published_on < slow_cutoff)
      retry_fast_reason = "version listed in consensus is quite old";
  }

  if (retry_fast_reason && desc_clean_since < fast_cutoff)
    mark_my_descriptor_dirty(retry_fast_reason);
}

/** Call when the current descriptor is out of date. */
void
mark_my_descriptor_dirty(const char *reason)
{
  const or_options_t *options = get_options();
  if (server_mode(options) && options->PublishServerDescriptor_)
    log_info(LD_OR, "Decided to publish new relay descriptor: %s", reason);
  desc_clean_since = 0;
  if (!desc_dirty_reason)
    desc_dirty_reason = reason;
}

/** How frequently will we republish our descriptor because of large (factor
 * of 2) shifts in estimated bandwidth? */
#define MAX_BANDWIDTH_CHANGE_FREQ (20*60)

/** Check whether bandwidth has changed a lot since the last time we announced
 * bandwidth. If so, mark our descriptor dirty. */
void
check_descriptor_bandwidth_changed(time_t now)
{
  static time_t last_changed = 0;
  uint64_t prev, cur;
  if (!desc_routerinfo)
    return;

  prev = desc_routerinfo->bandwidthcapacity;
  cur = we_are_hibernating() ? 0 : rep_hist_bandwidth_assess();
  if ((prev != cur && (!prev || !cur)) ||
      cur > prev*2 ||
      cur < prev/2) {
    if (last_changed+MAX_BANDWIDTH_CHANGE_FREQ < now) {
      log_info(LD_GENERAL,
               "Measured bandwidth has changed; rebuilding descriptor.");
      mark_my_descriptor_dirty("bandwidth has changed");
      last_changed = now;
    }
  }
}

/** Note at log level severity that our best guess of address has changed from
 * <b>prev</b> to <b>cur</b>. */
static void
log_addr_has_changed(int severity,
                     const tor_addr_t *prev,
                     const tor_addr_t *cur,
                     const char *source)
{
  char addrbuf_prev[TOR_ADDR_BUF_LEN];
  char addrbuf_cur[TOR_ADDR_BUF_LEN];

  if (tor_addr_to_str(addrbuf_prev, prev, sizeof(addrbuf_prev), 1) == NULL)
    strlcpy(addrbuf_prev, "???", TOR_ADDR_BUF_LEN);
  if (tor_addr_to_str(addrbuf_cur, cur, sizeof(addrbuf_cur), 1) == NULL)
    strlcpy(addrbuf_cur, "???", TOR_ADDR_BUF_LEN);

  if (!tor_addr_is_null(prev))
    log_fn(severity, LD_GENERAL,
           "Our IP Address has changed from %s to %s; "
           "rebuilding descriptor (source: %s).",
           addrbuf_prev, addrbuf_cur, source);
  else
    log_notice(LD_GENERAL,
             "Guessed our IP address as %s (source: %s).",
             addrbuf_cur, source);
}

/** Check whether our own address as defined by the Address configuration
 * has changed. This is for routers that get their address from a service
 * like dyndns. If our address has changed, mark our descriptor dirty. */
void
check_descriptor_ipaddress_changed(time_t now)
{
  uint32_t prev, cur;
  const or_options_t *options = get_options();
  const char *method = NULL;
  char *hostname = NULL;

  (void) now;

  if (!desc_routerinfo)
    return;

  /* XXXX ipv6 */
  prev = desc_routerinfo->addr;
  if (resolve_my_address(LOG_INFO, options, &cur, &method, &hostname) < 0) {
    log_info(LD_CONFIG,"options->Address didn't resolve into an IP.");
    return;
  }

  if (prev != cur) {
    char *source;
    tor_addr_t tmp_prev, tmp_cur;

    tor_addr_from_ipv4h(&tmp_prev, prev);
    tor_addr_from_ipv4h(&tmp_cur, cur);

    tor_asprintf(&source, "METHOD=%s%s%s", method,
                 hostname ? " HOSTNAME=" : "",
                 hostname ? hostname : "");

    log_addr_has_changed(LOG_NOTICE, &tmp_prev, &tmp_cur, source);
    tor_free(source);

    ip_address_changed(0);
  }

  tor_free(hostname);
}

/** The most recently guessed value of our IP address, based on directory
 * headers. */
static tor_addr_t last_guessed_ip = TOR_ADDR_NULL;

/** A directory server <b>d_conn</b> told us our IP address is
 * <b>suggestion</b>.
 * If this address is different from the one we think we are now, and
 * if our computer doesn't actually know its IP address, then switch. */
void
router_new_address_suggestion(const char *suggestion,
                              const dir_connection_t *d_conn)
{
  tor_addr_t addr;
  uint32_t cur = 0;             /* Current IPv4 address.  */
  const or_options_t *options = get_options();

  /* first, learn what the IP address actually is */
  if (tor_addr_parse(&addr, suggestion) == -1) {
    log_debug(LD_DIR, "Malformed X-Your-Address-Is header %s. Ignoring.",
              escaped(suggestion));
    return;
  }

  log_debug(LD_DIR, "Got X-Your-Address-Is: %s.", suggestion);

  if (!server_mode(options)) {
    tor_addr_copy(&last_guessed_ip, &addr);
    return;
  }

  /* XXXX ipv6 */
  cur = get_last_resolved_addr();
  if (cur ||
      resolve_my_address(LOG_INFO, options, &cur, NULL, NULL) >= 0) {
    /* We're all set -- we already know our address. Great. */
    tor_addr_from_ipv4h(&last_guessed_ip, cur); /* store it in case we
                                                   need it later */
    return;
  }
  if (tor_addr_is_internal(&addr, 0)) {
    /* Don't believe anybody who says our IP is, say, 127.0.0.1. */
    return;
  }
  if (tor_addr_eq(&d_conn->base_.addr, &addr)) {
    /* Don't believe anybody who says our IP is their IP. */
    log_debug(LD_DIR, "A directory server told us our IP address is %s, "
              "but he's just reporting his own IP address. Ignoring.",
              suggestion);
    return;
  }

  /* Okay.  We can't resolve our own address, and X-Your-Address-Is is giving
   * us an answer different from what we had the last time we managed to
   * resolve it. */
  if (!tor_addr_eq(&last_guessed_ip, &addr)) {
    control_event_server_status(LOG_NOTICE,
                                "EXTERNAL_ADDRESS ADDRESS=%s METHOD=DIRSERV",
                                suggestion);
    log_addr_has_changed(LOG_NOTICE, &last_guessed_ip, &addr,
                         d_conn->base_.address);
    ip_address_changed(0);
    tor_addr_copy(&last_guessed_ip, &addr); /* router_rebuild_descriptor()
                                               will fetch it */
  }
}

/** We failed to resolve our address locally, but we'd like to build
 * a descriptor and publish / test reachability. If we have a guess
 * about our address based on directory headers, answer it and return
 * 0; else return -1. */
static int
router_guess_address_from_dir_headers(uint32_t *guess)
{
  if (!tor_addr_is_null(&last_guessed_ip)) {
    *guess = tor_addr_to_ipv4h(&last_guessed_ip);
    return 0;
  }
  return -1;
}

/** Set <b>platform</b> (max length <b>len</b>) to a NUL-terminated short
 * string describing the version of Tor and the operating system we're
 * currently running on.
 */
STATIC void
get_platform_str(char *platform, size_t len)
{
  tor_snprintf(platform, len, "Tor %s on %s",
               get_short_version(), get_uname());
}

/* XXX need to audit this thing and count fenceposts. maybe
 *     refactor so we don't have to keep asking if we're
 *     near the end of maxlen?
 */
#define DEBUG_ROUTER_DUMP_ROUTER_TO_STRING

/** OR only: Given a routerinfo for this router, and an identity key to sign
 * with, encode the routerinfo as a signed server descriptor and return a new
 * string encoding the result, or NULL on failure.
 */
char *
router_dump_router_to_string(routerinfo_t *router,
                             crypto_pk_t *ident_key)
{
  char *address = NULL;
  char *onion_pkey = NULL; /* Onion key, PEM-encoded. */
  char *identity_pkey = NULL; /* Identity key, PEM-encoded. */
  char digest[DIGEST_LEN];
  char published[ISO_TIME_LEN+1];
  char fingerprint[FINGERPRINT_LEN+1];
  int has_extra_info_digest;
  char extra_info_digest[HEX_DIGEST_LEN+1];
  size_t onion_pkeylen, identity_pkeylen;
  char *family_line = NULL;
  char *extra_or_address = NULL;
  const or_options_t *options = get_options();
  smartlist_t *chunks = NULL;
  char *output = NULL;

  /* Make sure the identity key matches the one in the routerinfo. */
  if (!crypto_pk_eq_keys(ident_key, router->identity_pkey)) {
    log_warn(LD_BUG,"Tried to sign a router with a private key that didn't "
             "match router's public key!");
    goto err;
  }

  /* record our fingerprint, so we can include it in the descriptor */
  if (crypto_pk_get_fingerprint(router->identity_pkey, fingerprint, 1)<0) {
    log_err(LD_BUG,"Error computing fingerprint");
    goto err;
  }

  /* PEM-encode the onion key */
  if (crypto_pk_write_public_key_to_string(router->onion_pkey,
                                           &onion_pkey,&onion_pkeylen)<0) {
    log_warn(LD_BUG,"write onion_pkey to string failed!");
    goto err;
  }

  /* PEM-encode the identity key */
  if (crypto_pk_write_public_key_to_string(router->identity_pkey,
                                        &identity_pkey,&identity_pkeylen)<0) {
    log_warn(LD_BUG,"write identity_pkey to string failed!");
    goto err;
  }

  /* Encode the publication time. */
  format_iso_time(published, router->cache_info.published_on);

  if (router->declared_family && smartlist_len(router->declared_family)) {
    char *family = smartlist_join_strings(router->declared_family,
                                          " ", 0, NULL);
    tor_asprintf(&family_line, "family %s\n", family);
    tor_free(family);
  } else {
    family_line = tor_strdup("");
  }

  has_extra_info_digest =
    ! tor_digest_is_zero(router->cache_info.extra_info_digest);

  if (has_extra_info_digest) {
    base16_encode(extra_info_digest, sizeof(extra_info_digest),
                  router->cache_info.extra_info_digest, DIGEST_LEN);
  }

  if (router->ipv6_orport &&
      tor_addr_family(&router->ipv6_addr) == AF_INET6) {
    char addr[TOR_ADDR_BUF_LEN];
    const char *a;
    a = tor_addr_to_str(addr, &router->ipv6_addr, sizeof(addr), 1);
    if (a) {
      tor_asprintf(&extra_or_address,
                   "or-address %s:%d\n", a, router->ipv6_orport);
      log_debug(LD_OR, "My or-address line is <%s>", extra_or_address);
    }
  }

  address = tor_dup_ip(router->addr);
  chunks = smartlist_new();

  /* Generate the easy portion of the router descriptor. */
  smartlist_add_asprintf(chunks,
                    "router %s %s %d 0 %d\n"
                    "%s"
                    "platform %s\n"
                    "protocols Link 1 2 Circuit 1\n"
                    "published %s\n"
                    "fingerprint %s\n"
                    "uptime %ld\n"
                    "bandwidth %d %d %d\n"
                    "%s%s%s%s"
                    "onion-key\n%s"
                    "signing-key\n%s"
                    "%s%s%s%s",
    router->nickname,
    address,
    router->or_port,
    decide_to_advertise_dirport(options, router->dir_port),
    extra_or_address ? extra_or_address : "",
    router->platform,
    published,
    fingerprint,
    stats_n_seconds_working,
    (int) router->bandwidthrate,
    (int) router->bandwidthburst,
    (int) router->bandwidthcapacity,
    has_extra_info_digest ? "extra-info-digest " : "",
    has_extra_info_digest ? extra_info_digest : "",
    has_extra_info_digest ? "\n" : "",
    options->DownloadExtraInfo ? "caches-extra-info\n" : "",
    onion_pkey, identity_pkey,
    family_line,
    we_are_hibernating() ? "hibernating 1\n" : "",
    options->HidServDirectoryV2 ? "hidden-service-dir\n" : "",
    options->AllowSingleHopExits ? "allow-single-hop-exits\n" : "");

  if (options->ContactInfo && strlen(options->ContactInfo)) {
    const char *ci = options->ContactInfo;
    if (strchr(ci, '\n') || strchr(ci, '\r'))
      ci = escaped(ci);
    smartlist_add_asprintf(chunks, "contact %s\n", ci);
  }

#ifdef CURVE25519_ENABLED
  if (router->onion_curve25519_pkey) {
    char kbuf[128];
    base64_encode(kbuf, sizeof(kbuf),
                  (const char *)router->onion_curve25519_pkey->public_key,
                  CURVE25519_PUBKEY_LEN);
    smartlist_add_asprintf(chunks, "ntor-onion-key %s", kbuf);
  }
#endif

  /* Write the exit policy to the end of 's'. */
  if (!router->exit_policy || !smartlist_len(router->exit_policy)) {
    smartlist_add(chunks, tor_strdup("reject *:*\n"));
  } else if (router->exit_policy) {
    int i;
    for (i = 0; i < smartlist_len(router->exit_policy); ++i) {
      char pbuf[POLICY_BUF_LEN];
      addr_policy_t *tmpe = smartlist_get(router->exit_policy, i);
      int result;
      if (tor_addr_family(&tmpe->addr) == AF_INET6)
        continue; /* Don't include IPv6 parts of address policy */
      result = policy_write_item(pbuf, POLICY_BUF_LEN, tmpe, 1);
      if (result < 0) {
        log_warn(LD_BUG,"descriptor policy_write_item ran out of room!");
        goto err;
      }
      smartlist_add_asprintf(chunks, "%s\n", pbuf);
    }
  }

  if (router->ipv6_exit_policy) {
    char *p6 = write_short_policy(router->ipv6_exit_policy);
    if (p6 && strcmp(p6, "reject 1-65535")) {
      smartlist_add_asprintf(chunks,
                            "ipv6-policy %s\n", p6);
    }
    tor_free(p6);
  }

  /* Sign the descriptor */
  smartlist_add(chunks, tor_strdup("router-signature\n"));

  crypto_digest_smartlist(digest, DIGEST_LEN, chunks, "", DIGEST_SHA1);

  note_crypto_pk_op(SIGN_RTR);
  {
    char *sig;
    if (!(sig = router_get_dirobj_signature(digest, DIGEST_LEN, ident_key))) {
      log_warn(LD_BUG, "Couldn't sign router descriptor");
      goto err;
    }
    smartlist_add(chunks, sig);
  }

  /* include a last '\n' */
  smartlist_add(chunks, tor_strdup("\n"));

  output = smartlist_join_strings(chunks, "", 0, NULL);

#ifdef DEBUG_ROUTER_DUMP_ROUTER_TO_STRING
  {
    char *s_dup;
    const char *cp;
    routerinfo_t *ri_tmp;
    cp = s_dup = tor_strdup(output);
    ri_tmp = router_parse_entry_from_string(cp, NULL, 1, 0, NULL);
    if (!ri_tmp) {
      log_err(LD_BUG,
              "We just generated a router descriptor we can't parse.");
      log_err(LD_BUG, "Descriptor was: <<%s>>", output);
      goto err;
    }
    tor_free(s_dup);
    routerinfo_free(ri_tmp);
  }
#endif

  goto done;

 err:
  tor_free(output); /* sets output to NULL */
 done:
  if (chunks) {
    SMARTLIST_FOREACH(chunks, char *, cp, tor_free(cp));
    smartlist_free(chunks);
  }
  tor_free(address);
  tor_free(family_line);
  tor_free(onion_pkey);
  tor_free(identity_pkey);
  tor_free(extra_or_address);

  return output;
}

/** Copy the primary (IPv4) OR port (IP address and TCP port) for
 * <b>router</b> into *<b>ap_out</b>. */
void
router_get_prim_orport(const routerinfo_t *router, tor_addr_port_t *ap_out)
{
  tor_assert(ap_out != NULL);
  tor_addr_from_ipv4h(&ap_out->addr, router->addr);
  ap_out->port = router->or_port;
}

/** Return 1 if any of <b>router</b>'s addresses are <b>addr</b>.
 *   Otherwise return 0. */
int
router_has_addr(const routerinfo_t *router, const tor_addr_t *addr)
{
  return
    tor_addr_eq_ipv4h(addr, router->addr) ||
    tor_addr_eq(&router->ipv6_addr, addr);
}

int
router_has_orport(const routerinfo_t *router, const tor_addr_port_t *orport)
{
  return
    (tor_addr_eq_ipv4h(&orport->addr, router->addr) &&
     orport->port == router->or_port) ||
    (tor_addr_eq(&orport->addr, &router->ipv6_addr) &&
     orport->port == router->ipv6_orport);
}

/** Load the contents of <b>filename</b>, find the last line starting with
 * <b>end_line</b>, ensure that its timestamp is not more than 25 hours in
 * the past or more than 1 hour in the future with respect to <b>now</b>,
 * and write the file contents starting with that line to *<b>out</b>.
 * Return 1 for success, 0 if the file does not exist, or -1 if the file
 * does not contain a line matching these criteria or other failure. */
static int
load_stats_file(const char *filename, const char *end_line, time_t now,
                char **out)
{
  int r = -1;
  char *fname = get_datadir_fname(filename);
  char *contents, *start = NULL, *tmp, timestr[ISO_TIME_LEN+1];
  time_t written;
  switch (file_status(fname)) {
    case FN_FILE:
      /* X022 Find an alternative to reading the whole file to memory. */
      if ((contents = read_file_to_str(fname, 0, NULL))) {
        tmp = strstr(contents, end_line);
        /* Find last block starting with end_line */
        while (tmp) {
          start = tmp;
          tmp = strstr(tmp + 1, end_line);
        }
        if (!start)
          goto notfound;
        if (strlen(start) < strlen(end_line) + 1 + sizeof(timestr))
          goto notfound;
        strlcpy(timestr, start + 1 + strlen(end_line), sizeof(timestr));
        if (parse_iso_time(timestr, &written) < 0)
          goto notfound;
        if (written < now - (25*60*60) || written > now + (1*60*60))
          goto notfound;
        *out = tor_strdup(start);
        r = 1;
      }
     notfound:
      tor_free(contents);
      break;
    case FN_NOENT:
      r = 0;
      break;
    case FN_ERROR:
    case FN_DIR:
    default:
      break;
  }
  tor_free(fname);
  return r;
}

/** Write the contents of <b>extrainfo</b> and aggregated statistics to
 * *<b>s_out</b>, signing them with <b>ident_key</b>. Return 0 on
 * success, negative on failure. */
int
extrainfo_dump_to_string(char **s_out, extrainfo_t *extrainfo,
                         crypto_pk_t *ident_key)
{
  const or_options_t *options = get_options();
  char identity[HEX_DIGEST_LEN+1];
  char published[ISO_TIME_LEN+1];
  char digest[DIGEST_LEN];
  char *bandwidth_usage;
  int result;
  static int write_stats_to_extrainfo = 1;
  char sig[DIROBJ_MAX_SIG_LEN+1];
  char *s, *pre, *contents, *cp, *s_dup = NULL;
  time_t now = time(NULL);
  smartlist_t *chunks = smartlist_new();
  extrainfo_t *ei_tmp = NULL;

  base16_encode(identity, sizeof(identity),
                extrainfo->cache_info.identity_digest, DIGEST_LEN);
  format_iso_time(published, extrainfo->cache_info.published_on);
  bandwidth_usage = rep_hist_get_bandwidth_lines();

  tor_asprintf(&pre, "extra-info %s %s\npublished %s\n%s",
               extrainfo->nickname, identity,
               published, bandwidth_usage);
  tor_free(bandwidth_usage);
  smartlist_add(chunks, pre);

  if (geoip_is_loaded(AF_INET))
    smartlist_add_asprintf(chunks, "geoip-db-digest %s\n",
                           geoip_db_digest(AF_INET));
  if (geoip_is_loaded(AF_INET6))
    smartlist_add_asprintf(chunks, "geoip6-db-digest %s\n",
                           geoip_db_digest(AF_INET6));

  if (options->ExtraInfoStatistics && write_stats_to_extrainfo) {
    log_info(LD_GENERAL, "Adding stats to extra-info descriptor.");
    if (options->DirReqStatistics &&
        load_stats_file("stats"PATH_SEPARATOR"dirreq-stats",
                        "dirreq-stats-end", now, &contents) > 0) {
      smartlist_add(chunks, contents);
    }
    if (options->EntryStatistics &&
        load_stats_file("stats"PATH_SEPARATOR"entry-stats",
                        "entry-stats-end", now, &contents) > 0) {
      smartlist_add(chunks, contents);
    }
    if (options->CellStatistics &&
        load_stats_file("stats"PATH_SEPARATOR"buffer-stats",
                        "cell-stats-end", now, &contents) > 0) {
      smartlist_add(chunks, contents);
    }
    if (options->ExitPortStatistics &&
        load_stats_file("stats"PATH_SEPARATOR"exit-stats",
                        "exit-stats-end", now, &contents) > 0) {
      smartlist_add(chunks, contents);
    }
    if (options->ConnDirectionStatistics &&
        load_stats_file("stats"PATH_SEPARATOR"conn-stats",
                        "conn-bi-direct", now, &contents) > 0) {
      smartlist_add(chunks, contents);
    }
  }

  /* Add information about the pluggable transports we support. */
  if (options->ServerTransportPlugin) {
    char *pluggable_transports = pt_get_extra_info_descriptor_string();
    if (pluggable_transports)
      smartlist_add(chunks, pluggable_transports);
  }

  if (should_record_bridge_info(options) && write_stats_to_extrainfo) {
    const char *bridge_stats = geoip_get_bridge_stats_extrainfo(now);
    if (bridge_stats) {
      smartlist_add(chunks, tor_strdup(bridge_stats));
    }
  }

  smartlist_add(chunks, tor_strdup("router-signature\n"));
  s = smartlist_join_strings(chunks, "", 0, NULL);

  while (strlen(s) > MAX_EXTRAINFO_UPLOAD_SIZE - DIROBJ_MAX_SIG_LEN) {
    /* So long as there are at least two chunks (one for the initial
     * extra-info line and one for the router-signature), we can keep removing
     * things. */
    if (smartlist_len(chunks) > 2) {
      /* We remove the next-to-last element (remember, len-1 is the last
         element), since we need to keep the router-signature element. */
      int idx = smartlist_len(chunks) - 2;
      char *e = smartlist_get(chunks, idx);
      smartlist_del_keeporder(chunks, idx);
      log_warn(LD_GENERAL, "We just generated an extra-info descriptor "
                           "with statistics that exceeds the 50 KB "
                           "upload limit. Removing last added "
                           "statistics.");
      tor_free(e);
      tor_free(s);
      s = smartlist_join_strings(chunks, "", 0, NULL);
    } else {
      log_warn(LD_BUG, "We just generated an extra-info descriptors that "
                       "exceeds the 50 KB upload limit.");
      goto err;
    }
  }

  memset(sig, 0, sizeof(sig));
  if (router_get_extrainfo_hash(s, strlen(s), digest) < 0 ||
      router_append_dirobj_signature(sig, sizeof(sig), digest, DIGEST_LEN,
                                     ident_key) < 0) {
    log_warn(LD_BUG, "Could not append signature to extra-info "
                     "descriptor.");
    goto err;
  }
  smartlist_add(chunks, tor_strdup(sig));
  tor_free(s);
  s = smartlist_join_strings(chunks, "", 0, NULL);

  cp = s_dup = tor_strdup(s);
  ei_tmp = extrainfo_parse_entry_from_string(cp, NULL, 1, NULL);
  if (!ei_tmp) {
    if (write_stats_to_extrainfo) {
      log_warn(LD_GENERAL, "We just generated an extra-info descriptor "
                           "with statistics that we can't parse. Not "
                           "adding statistics to this or any future "
                           "extra-info descriptors.");
      write_stats_to_extrainfo = 0;
      result = extrainfo_dump_to_string(s_out, extrainfo, ident_key);
      goto done;
    } else {
      log_warn(LD_BUG, "We just generated an extrainfo descriptor we "
                       "can't parse.");
      goto err;
    }
  }

  *s_out = s;
  s = NULL; /* prevent free */
  result = 0;
  goto done;

 err:
  result = -1;

 done:
  tor_free(s);
  SMARTLIST_FOREACH(chunks, char *, cp, tor_free(cp));
  smartlist_free(chunks);
  tor_free(s_dup);
  extrainfo_free(ei_tmp);

  return result;
}

/** Return true iff <b>s</b> is a valid server nickname. (That is, a string
 * containing between 1 and MAX_NICKNAME_LEN characters from
 * LEGAL_NICKNAME_CHARACTERS.) */
int
is_legal_nickname(const char *s)
{
  size_t len;
  tor_assert(s);
  len = strlen(s);
  return len > 0 && len <= MAX_NICKNAME_LEN &&
    strspn(s,LEGAL_NICKNAME_CHARACTERS) == len;
}

/** Return true iff <b>s</b> is a valid server nickname or
 * hex-encoded identity-key digest. */
int
is_legal_nickname_or_hexdigest(const char *s)
{
  if (*s!='$')
    return is_legal_nickname(s);
  else
    return is_legal_hexdigest(s);
}

/** Return true iff <b>s</b> is a valid hex-encoded identity-key
 * digest. (That is, an optional $, followed by 40 hex characters,
 * followed by either nothing, or = or ~ followed by a nickname, or
 * a character other than =, ~, or a hex character.)
 */
int
is_legal_hexdigest(const char *s)
{
  size_t len;
  tor_assert(s);
  if (s[0] == '$') s++;
  len = strlen(s);
  if (len > HEX_DIGEST_LEN) {
    if (s[HEX_DIGEST_LEN] == '=' ||
        s[HEX_DIGEST_LEN] == '~') {
      if (!is_legal_nickname(s+HEX_DIGEST_LEN+1))
        return 0;
    } else {
      return 0;
    }
  }
  return (len >= HEX_DIGEST_LEN &&
          strspn(s,HEX_CHARACTERS)==HEX_DIGEST_LEN);
}

/** Use <b>buf</b> (which must be at least NODE_DESC_BUF_LEN bytes long) to
 * hold a human-readable description of a node with identity digest
 * <b>id_digest</b>, named-status <b>is_named</b>, nickname <b>nickname</b>,
 * and address <b>addr</b> or <b>addr32h</b>.
 *
 * The <b>nickname</b> and <b>addr</b> fields are optional and may be set to
 * NULL.  The <b>addr32h</b> field is optional and may be set to 0.
 *
 * Return a pointer to the front of <b>buf</b>.
 */
const char *
format_node_description(char *buf,
                        const char *id_digest,
                        int is_named,
                        const char *nickname,
                        const tor_addr_t *addr,
                        uint32_t addr32h)
{
  char *cp;

  if (!buf)
    return "<NULL BUFFER>";

  buf[0] = '$';
  base16_encode(buf+1, HEX_DIGEST_LEN+1, id_digest, DIGEST_LEN);
  cp = buf+1+HEX_DIGEST_LEN;
  if (nickname) {
    buf[1+HEX_DIGEST_LEN] = is_named ? '=' : '~';
    strlcpy(buf+1+HEX_DIGEST_LEN+1, nickname, MAX_NICKNAME_LEN+1);
    cp += strlen(cp);
  }
  if (addr32h || addr) {
    memcpy(cp, " at ", 4);
    cp += 4;
    if (addr) {
      tor_addr_to_str(cp, addr, TOR_ADDR_BUF_LEN, 0);
    } else {
      struct in_addr in;
      in.s_addr = htonl(addr32h);
      tor_inet_ntoa(&in, cp, INET_NTOA_BUF_LEN);
    }
  }
  return buf;
}

/** Use <b>buf</b> (which must be at least NODE_DESC_BUF_LEN bytes long) to
 * hold a human-readable description of <b>ri</b>.
 *
 *
 * Return a pointer to the front of <b>buf</b>.
 */
const char *
router_get_description(char *buf, const routerinfo_t *ri)
{
  if (!ri)
    return "<null>";
  return format_node_description(buf,
                                 ri->cache_info.identity_digest,
                                 router_is_named(ri),
                                 ri->nickname,
                                 NULL,
                                 ri->addr);
}

/** Use <b>buf</b> (which must be at least NODE_DESC_BUF_LEN bytes long) to
 * hold a human-readable description of <b>node</b>.
 *
 * Return a pointer to the front of <b>buf</b>.
 */
const char *
node_get_description(char *buf, const node_t *node)
{
  const char *nickname = NULL;
  uint32_t addr32h = 0;
  int is_named = 0;

  if (!node)
    return "<null>";

  if (node->rs) {
    nickname = node->rs->nickname;
    is_named = node->rs->is_named;
    addr32h = node->rs->addr;
  } else if (node->ri) {
    nickname = node->ri->nickname;
    addr32h = node->ri->addr;
  }

  return format_node_description(buf,
                                 node->identity,
                                 is_named,
                                 nickname,
                                 NULL,
                                 addr32h);
}

/** Use <b>buf</b> (which must be at least NODE_DESC_BUF_LEN bytes long) to
 * hold a human-readable description of <b>rs</b>.
 *
 * Return a pointer to the front of <b>buf</b>.
 */
const char *
routerstatus_get_description(char *buf, const routerstatus_t *rs)
{
  if (!rs)
    return "<null>";
  return format_node_description(buf,
                                 rs->identity_digest,
                                 rs->is_named,
                                 rs->nickname,
                                 NULL,
                                 rs->addr);
}

/** Use <b>buf</b> (which must be at least NODE_DESC_BUF_LEN bytes long) to
 * hold a human-readable description of <b>ei</b>.
 *
 * Return a pointer to the front of <b>buf</b>.
 */
const char *
extend_info_get_description(char *buf, const extend_info_t *ei)
{
  if (!ei)
    return "<null>";
  return format_node_description(buf,
                                 ei->identity_digest,
                                 0,
                                 ei->nickname,
                                 &ei->addr,
                                 0);
}

/** Return a human-readable description of the routerinfo_t <b>ri</b>.
 *
 * This function is not thread-safe.  Each call to this function invalidates
 * previous values returned by this function.
 */
const char *
router_describe(const routerinfo_t *ri)
{
  static char buf[NODE_DESC_BUF_LEN];
  return router_get_description(buf, ri);
}

/** Return a human-readable description of the node_t <b>node</b>.
 *
 * This function is not thread-safe.  Each call to this function invalidates
 * previous values returned by this function.
 */
const char *
node_describe(const node_t *node)
{
  static char buf[NODE_DESC_BUF_LEN];
  return node_get_description(buf, node);
}

/** Return a human-readable description of the routerstatus_t <b>rs</b>.
 *
 * This function is not thread-safe.  Each call to this function invalidates
 * previous values returned by this function.
 */
const char *
routerstatus_describe(const routerstatus_t *rs)
{
  static char buf[NODE_DESC_BUF_LEN];
  return routerstatus_get_description(buf, rs);
}

/** Return a human-readable description of the extend_info_t <b>ri</b>.
 *
 * This function is not thread-safe.  Each call to this function invalidates
 * previous values returned by this function.
 */
const char *
extend_info_describe(const extend_info_t *ei)
{
  static char buf[NODE_DESC_BUF_LEN];
  return extend_info_get_description(buf, ei);
}

/** Set <b>buf</b> (which must have MAX_VERBOSE_NICKNAME_LEN+1 bytes) to the
 * verbose representation of the identity of <b>router</b>.  The format is:
 *  A dollar sign.
 *  The upper-case hexadecimal encoding of the SHA1 hash of router's identity.
 *  A "=" if the router is named; a "~" if it is not.
 *  The router's nickname.
 **/
void
router_get_verbose_nickname(char *buf, const routerinfo_t *router)
{
  const char *good_digest = networkstatus_get_router_digest_by_nickname(
                                                         router->nickname);
  int is_named = good_digest && tor_memeq(good_digest,
                                        router->cache_info.identity_digest,
                                        DIGEST_LEN);
  buf[0] = '$';
  base16_encode(buf+1, HEX_DIGEST_LEN+1, router->cache_info.identity_digest,
                DIGEST_LEN);
  buf[1+HEX_DIGEST_LEN] = is_named ? '=' : '~';
  strlcpy(buf+1+HEX_DIGEST_LEN+1, router->nickname, MAX_NICKNAME_LEN+1);
}

/** Forget that we have issued any router-related warnings, so that we'll
 * warn again if we see the same errors. */
void
router_reset_warnings(void)
{
  if (warned_nonexistent_family) {
    SMARTLIST_FOREACH(warned_nonexistent_family, char *, cp, tor_free(cp));
    smartlist_clear(warned_nonexistent_family);
  }
}

/** Given a router purpose, convert it to a string.  Don't call this on
 * ROUTER_PURPOSE_UNKNOWN: The whole point of that value is that we don't
 * know its string representation. */
const char *
router_purpose_to_string(uint8_t p)
{
  switch (p)
    {
    case ROUTER_PURPOSE_GENERAL: return "general";
    case ROUTER_PURPOSE_BRIDGE: return "bridge";
    case ROUTER_PURPOSE_CONTROLLER: return "controller";
    default:
      tor_assert(0);
    }
  return NULL;
}

/** Given a string, convert it to a router purpose. */
uint8_t
router_purpose_from_string(const char *s)
{
  if (!strcmp(s, "general"))
    return ROUTER_PURPOSE_GENERAL;
  else if (!strcmp(s, "bridge"))
    return ROUTER_PURPOSE_BRIDGE;
  else if (!strcmp(s, "controller"))
    return ROUTER_PURPOSE_CONTROLLER;
  else
    return ROUTER_PURPOSE_UNKNOWN;
}

/** Release all static resources held in router.c */
void
router_free_all(void)
{
  crypto_pk_free(onionkey);
  crypto_pk_free(lastonionkey);
  crypto_pk_free(server_identitykey);
  crypto_pk_free(client_identitykey);
  tor_mutex_free(key_lock);
  routerinfo_free(desc_routerinfo);
  extrainfo_free(desc_extrainfo);
  crypto_pk_free(authority_signing_key);
  authority_cert_free(authority_key_certificate);
  crypto_pk_free(legacy_signing_key);
  authority_cert_free(legacy_key_certificate);

#ifdef CURVE25519_ENABLED
  memwipe(&curve25519_onion_key, 0, sizeof(curve25519_onion_key));
  memwipe(&last_curve25519_onion_key, 0, sizeof(last_curve25519_onion_key));
#endif

  if (warned_nonexistent_family) {
    SMARTLIST_FOREACH(warned_nonexistent_family, char *, cp, tor_free(cp));
    smartlist_free(warned_nonexistent_family);
  }
}

/** Return a smartlist of tor_addr_port_t's with all the OR ports of
    <b>ri</b>. Note that freeing of the items in the list as well as
    the smartlist itself is the callers responsibility.

    XXX duplicating code from node_get_all_orports(). */
smartlist_t *
router_get_all_orports(const routerinfo_t *ri)
{
  smartlist_t *sl = smartlist_new();
  tor_assert(ri);

  if (ri->addr != 0) {
    tor_addr_port_t *ap = tor_malloc(sizeof(tor_addr_port_t));
    tor_addr_from_ipv4h(&ap->addr, ri->addr);
    ap->port = ri->or_port;
    smartlist_add(sl, ap);
  }
  if (!tor_addr_is_null(&ri->ipv6_addr)) {
    tor_addr_port_t *ap = tor_malloc(sizeof(tor_addr_port_t));
    tor_addr_copy(&ap->addr, &ri->ipv6_addr);
    ap->port = ri->or_port;
    smartlist_add(sl, ap);
  }

  return sl;
}