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