Commit dfaa5ce7 authored by Nick Mathewson's avatar Nick Mathewson 🥄
Browse files

Add simple python tool to use Tor for DNS lookups


svn:r1977
parent 620b4308
#!/usr/bin/python
#$Id$
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:
print "return none", len(response)
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):
version = 5
command = 0xF0
rsv = 0
port = 0
atype = 0x03
reqheader = struct.pack("!BBBB",version, command, rsv, atype)
portstr = struct.pach("!H",port)
return "%s%s\0%s"%(reqheader,hostname,port)
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"
assert atype in (0x01,0x04)
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]))
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):
assert socksver in (4,5)
if socksver == 4:
fmt = socks4AResolveRequest
parse = socks4AParseResponse
else:
fmt = socks5ResolveRequest
parse = socks5ParseResponse
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((sockshost,socksport))
if socksver == 5:
s.send(socks5Hello())
socksParseHello(s.recv(2))
s.send(fmt(hostname))
answer = s.recv(8)
result = parse(answer)
while result is None:
answer += s.recv(1)
result = parse(answer)
print "Got answer",result
m = s.recv(1)
if m:
print "Got extra data too! Ick."
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)
if sys.argv[1] in ("-4", "-5"):
socksver = int(sys.argv[1][1])
del sys.argv[1]
if len(sys.argv) == 4:
print "Syntax: resolve.py [-4|-5] hostname [sockshost:socksport]"
sys.exit(0)
if len(sys.argv) == 3:
sh,sp = parseHostAndPort(sys.argv[2])
else:
sh,sp = parseHostAndPort("")
resolve(sys.argv[1], sh, sp)
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