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Socks Module #python
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"""SocksiPy - Python SOCKS module. | |
Version 1.00 | |
Copyright 2006 Dan-Haim. All rights reserved. | |
Redistribution and use in source and binary forms, with or without modification, | |
are permitted provided that the following conditions are met: | |
1. Redistributions of source code must retain the above copyright notice, this | |
list of conditions and the following disclaimer. | |
2. Redistributions in binary form must reproduce the above copyright notice, | |
this list of conditions and the following disclaimer in the documentation | |
and/or other materials provided with the distribution. | |
3. Neither the name of Dan Haim nor the names of his contributors may be used | |
to endorse or promote products derived from this software without specific | |
prior written permission. | |
THIS SOFTWARE IS PROVIDED BY DAN HAIM "AS IS" AND ANY EXPRESS OR IMPLIED | |
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO | |
EVENT SHALL DAN HAIM OR HIS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, | |
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA | |
OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT | |
OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMANGE. | |
This module provides a standard socket-like interface for Python | |
for tunneling connections through SOCKS proxies. | |
""" | |
import socket | |
import struct | |
PROXY_TYPE_SOCKS4 = 1 | |
PROXY_TYPE_SOCKS5 = 2 | |
PROXY_TYPE_HTTP = 3 | |
_defaultproxy = None | |
_orgsocket = socket.socket | |
class ProxyError(Exception): | |
def __init__(self, value): | |
self.value = value | |
def __str__(self): | |
return repr(self.value) | |
class GeneralProxyError(ProxyError): | |
def __init__(self, value): | |
self.value = value | |
def __str__(self): | |
return repr(self.value) | |
class Socks5AuthError(ProxyError): | |
def __init__(self, value): | |
self.value = value | |
def __str__(self): | |
return repr(self.value) | |
class Socks5Error(ProxyError): | |
def __init__(self, value): | |
self.value = value | |
def __str__(self): | |
return repr(self.value) | |
class Socks4Error(ProxyError): | |
def __init__(self, value): | |
self.value = value | |
def __str__(self): | |
return repr(self.value) | |
class HTTPError(ProxyError): | |
def __init__(self, value): | |
self.value = value | |
def __str__(self): | |
return repr(self.value) | |
_generalerrors = ("success", | |
"invalid data", | |
"not connected", | |
"not available", | |
"bad proxy type", | |
"bad input") | |
_socks5errors = ("succeeded", | |
"general SOCKS server failure", | |
"connection not allowed by ruleset", | |
"Network unreachable", | |
"Host unreachable", | |
"Connection refused", | |
"TTL expired", | |
"Command not supported", | |
"Address type not supported", | |
"Unknown error") | |
_socks5autherrors = ("succeeded", | |
"authentication is required", | |
"all offered authentication methods were rejected", | |
"unknown username or invalid password", | |
"unknown error") | |
_socks4errors = ("request granted", | |
"request rejected or failed", | |
"request rejected because SOCKS server cannot connect to identd on the client", | |
"request rejected because the client program and identd report different user-ids", | |
"unknown error") | |
def setdefaultproxy(proxytype=None,addr=None,port=None,rdns=True,username=None,password=None): | |
"""setdefaultproxy(proxytype, addr[, port[, rdns[, username[, password]]]]) | |
Sets a default proxy which all further socksocket objects will use, | |
unless explicitly changed. | |
""" | |
global _defaultproxy | |
_defaultproxy = (proxytype,addr,port,rdns,username,password) | |
class socksocket(socket.socket): | |
"""socksocket([family[, type[, proto]]]) -> socket object | |
Open a SOCKS enabled socket. The parameters are the same as | |
those of the standard socket init. In order for SOCKS to work, | |
you must specify family=AF_INET, type=SOCK_STREAM and proto=0. | |
""" | |
def __init__(self, family=socket.AF_INET, type=socket.SOCK_STREAM, proto=0, _sock=None): | |
_orgsocket.__init__(self,family,type,proto,_sock) | |
if _defaultproxy != None: | |
self.__proxy = _defaultproxy | |
else: | |
self.__proxy = (None, None, None, None, None, None) | |
self.__proxysockname = None | |
self.__proxypeername = None | |
def __recvall(self, bytes): | |
"""__recvall(bytes) -> data | |
Receive EXACTLY the number of bytes requested from the socket. | |
Blocks until the required number of bytes have been received. | |
""" | |
data = "" | |
while len(data) < bytes: | |
data = data + self.recv(bytes-len(data)) | |
return data | |
def setproxy(self,proxytype=None,addr=None,port=None,rdns=True,username=None,password=None): | |
"""setproxy(proxytype, addr[, port[, rdns[, username[, password]]]]) | |
Sets the proxy to be used. | |
proxytype - The type of the proxy to be used. Three types | |
are supported: PROXY_TYPE_SOCKS4 (including socks4a), | |
PROXY_TYPE_SOCKS5 and PROXY_TYPE_HTTP | |
addr - The address of the server (IP or DNS). | |
port - The port of the server. Defaults to 1080 for SOCKS | |
servers and 8080 for HTTP proxy servers. | |
rdns - Should DNS queries be preformed on the remote side | |
(rather than the local side). The default is True. | |
Note: This has no effect with SOCKS4 servers. | |
username - Username to authenticate with to the server. | |
The default is no authentication. | |
password - Password to authenticate with to the server. | |
Only relevant when username is also provided. | |
""" | |
self.__proxy = (proxytype,addr,port,rdns,username,password) | |
def __negotiatesocks5(self,destaddr,destport): | |
"""__negotiatesocks5(self,destaddr,destport) | |
Negotiates a connection through a SOCKS5 server. | |
""" | |
# First we'll send the authentication packages we support. | |
if (self.__proxy[4]!=None) and (self.__proxy[5]!=None): | |
# The username/password details were supplied to the | |
# setproxy method so we support the USERNAME/PASSWORD | |
# authentication (in addition to the standard none). | |
self.sendall("\x05\x02\x00\x02") | |
else: | |
# No username/password were entered, therefore we | |
# only support connections with no authentication. | |
self.sendall("\x05\x01\x00") | |
# We'll receive the server's response to determine which | |
# method was selected | |
chosenauth = self.__recvall(2) | |
if chosenauth[0] != "\x05": | |
self.close() | |
raise GeneralProxyError((1,_generalerrors[1])) | |
# Check the chosen authentication method | |
if chosenauth[1] == "\x00": | |
# No authentication is required | |
pass | |
elif chosenauth[1] == "\x02": | |
# Okay, we need to perform a basic username/password | |
# authentication. | |
self.sendall("\x01" + chr(len(self.__proxy[4])) + self.__proxy[4] + chr(len(self.proxy[5])) + self.__proxy[5]) | |
authstat = self.__recvall(2) | |
if authstat[0] != "\x01": | |
# Bad response | |
self.close() | |
raise GeneralProxyError((1,_generalerrors[1])) | |
if authstat[1] != "\x00": | |
# Authentication failed | |
self.close() | |
raise Socks5AuthError,((3,_socks5autherrors[3])) | |
# Authentication succeeded | |
else: | |
# Reaching here is always bad | |
self.close() | |
if chosenauth[1] == "\xFF": | |
raise Socks5AuthError((2,_socks5autherrors[2])) | |
else: | |
raise GeneralProxyError((1,_generalerrors[1])) | |
# Now we can request the actual connection | |
req = "\x05\x01\x00" | |
# If the given destination address is an IP address, we'll | |
# use the IPv4 address request even if remote resolving was specified. | |
try: | |
ipaddr = socket.inet_aton(destaddr) | |
req = req + "\x01" + ipaddr | |
except socket.error: | |
# Well it's not an IP number, so it's probably a DNS name. | |
if self.__proxy[3]==True: | |
# Resolve remotely | |
ipaddr = None | |
req = req + "\x03" + chr(len(destaddr)) + destaddr | |
else: | |
# Resolve locally | |
ipaddr = socket.inet_aton(socket.gethostbyname(destaddr)) | |
req = req + "\x01" + ipaddr | |
req = req + struct.pack(">H",destport) | |
self.sendall(req) | |
# Get the response | |
resp = self.__recvall(4) | |
if resp[0] != "\x05": | |
self.close() | |
raise GeneralProxyError((1,_generalerrors[1])) | |
elif resp[1] != "\x00": | |
# Connection failed | |
self.close() | |
if ord(resp[1])<=8: | |
raise Socks5Error(ord(resp[1]),_generalerrors[ord(resp[1])]) | |
else: | |
raise Socks5Error(9,_generalerrors[9]) | |
# Get the bound address/port | |
elif resp[3] == "\x01": | |
boundaddr = self.__recvall(4) | |
elif resp[3] == "\x03": | |
resp = resp + self.recv(1) | |
boundaddr = self.__recvall(resp[4]) | |
else: | |
self.close() | |
raise GeneralProxyError((1,_generalerrors[1])) | |
boundport = struct.unpack(">H",self.__recvall(2))[0] | |
self.__proxysockname = (boundaddr,boundport) | |
if ipaddr != None: | |
self.__proxypeername = (socket.inet_ntoa(ipaddr),destport) | |
else: | |
self.__proxypeername = (destaddr,destport) | |
def getproxysockname(self): | |
"""getsockname() -> address info | |
Returns the bound IP address and port number at the proxy. | |
""" | |
return self.__proxysockname | |
def getproxypeername(self): | |
"""getproxypeername() -> address info | |
Returns the IP and port number of the proxy. | |
""" | |
return _orgsocket.getpeername(self) | |
def getpeername(self): | |
"""getpeername() -> address info | |
Returns the IP address and port number of the destination | |
machine (note: getproxypeername returns the proxy) | |
""" | |
return self.__proxypeername | |
def __negotiatesocks4(self,destaddr,destport): | |
"""__negotiatesocks4(self,destaddr,destport) | |
Negotiates a connection through a SOCKS4 server. | |
""" | |
# Check if the destination address provided is an IP address | |
rmtrslv = False | |
try: | |
ipaddr = socket.inet_aton(destaddr) | |
except socket.error: | |
# It's a DNS name. Check where it should be resolved. | |
if self.__proxy[3]==True: | |
ipaddr = "\x00\x00\x00\x01" | |
rmtrslv = True | |
else: | |
ipaddr = socket.inet_aton(socket.gethostbyname(destaddr)) | |
# Construct the request packet | |
req = "\x04\x01" + struct.pack(">H",destport) + ipaddr | |
# The username parameter is considered userid for SOCKS4 | |
if self.__proxy[4] != None: | |
req = req + self.__proxy[4] | |
req = req + "\x00" | |
# DNS name if remote resolving is required | |
# NOTE: This is actually an extension to the SOCKS4 protocol | |
# called SOCKS4A and may not be supported in all cases. | |
if rmtrslv==True: | |
req = req + destaddr + "\x00" | |
self.sendall(req) | |
# Get the response from the server | |
resp = self.__recvall(8) | |
if resp[0] != "\x00": | |
# Bad data | |
self.close() | |
raise GeneralProxyError((1,_generalerrors[1])) | |
if resp[1] != "\x5A": | |
# Server returned an error | |
self.close() | |
if ord(resp[1]) in (91,92,93): | |
self.close() | |
raise Socks4Error((ord(resp[1]),_socks4errors[ord(resp[1])-90])) | |
else: | |
raise Socks4Error((94,_socks4errors[4])) | |
# Get the bound address/port | |
self.__proxysockname = (socket.inet_ntoa(resp[4:]),struct.unpack(">H",resp[2:4])[0]) | |
if rmtrslv != None: | |
self.__proxypeername = (socket.inet_ntoa(ipaddr),destport) | |
else: | |
self.__proxypeername = (destaddr,destport) | |
def __negotiatehttp(self,destaddr,destport): | |
"""__negotiatehttp(self,destaddr,destport) | |
Negotiates a connection through an HTTP server. | |
""" | |
# If we need to resolve locally, we do this now | |
if self.__proxy[3] == False: | |
addr = socket.gethostbyname(destaddr) | |
else: | |
addr = destaddr | |
self.sendall("CONNECT " + addr + ":" + str(destport) + " HTTP/1.1\r\n" + "Host: " + destaddr + "\r\n\r\n") | |
# We read the response until we get the string "\r\n\r\n" | |
resp = self.recv(1) | |
while resp.find("\r\n\r\n")==-1: | |
resp = resp + self.recv(1) | |
# We just need the first line to check if the connection | |
# was successful | |
statusline = resp.splitlines()[0].split(" ",2) | |
if statusline[0] not in ("HTTP/1.0","HTTP/1.1"): | |
self.close() | |
raise GeneralProxyError((1,_generalerrors[1])) | |
try: | |
statuscode = int(statusline[1]) | |
except ValueError: | |
self.close() | |
raise GeneralProxyError((1,_generalerrors[1])) | |
if statuscode != 200: | |
self.close() | |
raise HTTPError((statuscode,statusline[2])) | |
self.__proxysockname = ("0.0.0.0",0) | |
self.__proxypeername = (addr,destport) | |
def connect(self,destpair): | |
"""connect(self,despair) | |
Connects to the specified destination through a proxy. | |
destpar - A tuple of the IP/DNS address and the port number. | |
(identical to socket's connect). | |
To select the proxy server use setproxy(). | |
""" | |
# Do a minimal input check first | |
if (type(destpair) in (list,tuple)==False) or (len(destpair)<2) or (type(destpair[0])!=str) or (type(destpair[1])!=int): | |
raise GeneralProxyError((5,_generalerrors[5])) | |
if self.__proxy[0] == PROXY_TYPE_SOCKS5: | |
if self.__proxy[2] != None: | |
portnum = self.__proxy[2] | |
else: | |
portnum = 1080 | |
_orgsocket.connect(self,(self.__proxy[1],portnum)) | |
self.__negotiatesocks5(destpair[0],destpair[1]) | |
elif self.__proxy[0] == PROXY_TYPE_SOCKS4: | |
if self.__proxy[2] != None: | |
portnum = self.__proxy[2] | |
else: | |
portnum = 1080 | |
_orgsocket.connect(self,(self.__proxy[1],portnum)) | |
self.__negotiatesocks4(destpair[0],destpair[1]) | |
elif self.__proxy[0] == PROXY_TYPE_HTTP: | |
if self.__proxy[2] != None: | |
portnum = self.__proxy[2] | |
else: | |
portnum = 8080 | |
_orgsocket.connect(self,(self.__proxy[1],portnum)) | |
self.__negotiatehttp(destpair[0],destpair[1]) | |
elif self.__proxy[0] == None: | |
_orgsocket.connect(self,(destpair[0],destpair[1])) | |
else: | |
raise GeneralProxyError((4,_generalerrors[4])) |
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