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
|
#!/usr/bin/python
import socket
import struct
import sys
def socks4AResolveRequest(hostname):
version = 4
command = 0xF0
port = 0
addr = 0x0000001
username = ""
reqheader = struct.pack("!BBHL", version, command, port, addr)
return "%s%s\x00%s\x00"%(reqheader,username,hostname)
def socks4AParseResponse(response):
RESPONSE_LEN = 8
if len(response) < RESPONSE_LEN:
return None
assert len(response) >= RESPONSE_LEN
version,status,port = struct.unpack("!BBH",response[:4])
assert version == 0
assert port == 0
if status == 90:
return "%d.%d.%d.%d"%tuple(map(ord, response[4:]))
else:
return "ERROR (status %d)"%status
def socks5Hello():
return "\x05\x01\x00"
def socks5ParseHello(response):
if response != "\x05\x00":
raise ValueError("Bizarre socks5 response")
def socks5ResolveRequest(hostname, atype=0x03, command=0xF0):
version = 5
rsv = 0
port = 0
reqheader = struct.pack("!BBBB",version, command, rsv, atype)
if atype == 0x03:
reqheader += struct.pack("!B", len(hostname))
portstr = struct.pack("!H",port)
return "%s%s%s"%(reqheader,hostname,portstr)
def socks5ParseResponse(r):
if len(r)<8:
return None
version, reply, rsv, atype = struct.unpack("!BBBB",r[:4])
assert version==5
assert rsv==0
if reply != 0x00:
return "ERROR",reply
assert atype in (0x01,0x03,0x04)
if atype != 0x03:
expected_len = 4 + ({1:4,4:16}[atype]) + 2
if len(r) < expected_len:
return None
elif len(r) > expected_len:
raise ValueError("Overlong socks5 reply!")
addr = r[4:-2]
if atype == 0x01:
return "%d.%d.%d.%d"%tuple(map(ord,addr))
else:
# not really the right way to format IPv6
return "IPv6: %s"%(":".join([hex(ord(c)) for c in addr]))
else:
hlen, = struct.unpack("!B", r[4])
expected_len = 5 + hlen + 2
if len(r) < expected_len:
return None
return r[5:-2]
def socks5ResolvePTRRequest(hostname):
return socks5ResolveRequest(socket.inet_aton(hostname),
atype=1, command = 0xF1)
def parseHostAndPort(h):
host, port = "localhost", 9050
if ":" in h:
i = h.index(":")
host = h[:i]
try:
port = int(h[i+1:])
except ValueError:
print "Bad hostname %r"%h
sys.exit(1)
elif h:
try:
port = int(h)
except ValueError:
host = h
return host, port
def resolve(hostname, sockshost, socksport, socksver=4, reverse=0):
assert socksver in (4,5)
if socksver == 4:
fmt = socks4AResolveRequest
parse = socks4AParseResponse
elif not reverse:
fmt = socks5ResolveRequest
parse = socks5ParseResponse
else:
fmt = socks5ResolvePTRRequest
parse = socks5ParseResponse
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((sockshost,socksport))
if socksver == 5:
s.send(socks5Hello())
socks5ParseHello(s.recv(2))
s.send(fmt(hostname))
answer = s.recv(6)
result = parse(answer)
while result is None:
more = s.recv(1)
if not more:
return None
answer += more
result = parse(answer)
print "Got answer",result
m = s.recv(1)
if m:
print "Got extra data too: %r"%m
return result
if __name__ == '__main__':
if len(sys.argv) not in (2,3,4):
print "Syntax: resolve.py [-4|-5] hostname [sockshost:socksport]"
sys.exit(0)
socksver = 4
reverse = 0
while sys.argv[1][0] == '-':
if sys.argv[1] in ("-4", "-5"):
socksver = int(sys.argv[1][1])
del sys.argv[1]
elif sys.argv[1] == '-x':
reverse = 1
del sys.argv[1]
elif sys.argv[1] == '--':
break
if len(sys.argv) >= 4:
print "Syntax: resolve.py [-x] [-4|-5] hostname [sockshost:socksport]"
sys.exit(0)
if len(sys.argv) == 3:
sh,sp = parseHostAndPort(sys.argv[2])
else:
sh,sp = parseHostAndPort("")
if reverse and socksver == 4:
socksver = 5
resolve(sys.argv[1], sh, sp, socksver, reverse)
|