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  1. """SocksiPy - Python SOCKS module.
  2. Version 1.00
  3.  
  4. Copyright 2006 Dan-Haim. All rights reserved.
  5.  
  6. Redistribution and use in source and binary forms, with or without modification,
  7. are permitted provided that the following conditions are met:
  8. 1. Redistributions of source code must retain the above copyright notice, this
  9. list of conditions and the following disclaimer.
  10. 2. Redistributions in binary form must reproduce the above copyright notice,
  11. this list of conditions and the following disclaimer in the documentation
  12. and/or other materials provided with the distribution.
  13. 3. Neither the name of Dan Haim nor the names of his contributors may be used
  14. to endorse or promote products derived from this software without specific
  15. prior written permission.
  16.  
  17. THIS SOFTWARE IS PROVIDED BY DAN HAIM "AS IS" AND ANY EXPRESS OR IMPLIED
  18. WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  19. MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
  20. EVENT SHALL DAN HAIM OR HIS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  21. INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22. LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA
  23. OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  24. LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  25. OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMANGE.
  26.  
  27.  
  28. This module provides a standard socket-like interface for Python
  29. for tunneling connections through SOCKS proxies.
  30.  
  31. """
  32.  
  33. import socket
  34. import struct
  35.  
  36. PROXY_TYPE_SOCKS4 = 1
  37. PROXY_TYPE_SOCKS5 = 2
  38. PROXY_TYPE_HTTP = 3
  39.  
  40. _defaultproxy = None
  41. _orgsocket = socket.socket
  42.  
  43. class ProxyError(Exception):
  44. def __init__(self, value):
  45. self.value = value
  46. def __str__(self):
  47. return repr(self.value)
  48.  
  49. class GeneralProxyError(ProxyError):
  50. def __init__(self, value):
  51. self.value = value
  52. def __str__(self):
  53. return repr(self.value)
  54.  
  55. class Socks5AuthError(ProxyError):
  56. def __init__(self, value):
  57. self.value = value
  58. def __str__(self):
  59. return repr(self.value)
  60.  
  61. class Socks5Error(ProxyError):
  62. def __init__(self, value):
  63. self.value = value
  64. def __str__(self):
  65. return repr(self.value)
  66.  
  67. class Socks4Error(ProxyError):
  68. def __init__(self, value):
  69. self.value = value
  70. def __str__(self):
  71. return repr(self.value)
  72.  
  73. class HTTPError(ProxyError):
  74. def __init__(self, value):
  75. self.value = value
  76. def __str__(self):
  77. return repr(self.value)
  78.  
  79. _generalerrors = ("success",
  80. "invalid data",
  81. "not connected",
  82. "not available",
  83. "bad proxy type",
  84. "bad input")
  85.  
  86. _socks5errors = ("succeeded",
  87. "general SOCKS server failure",
  88. "connection not allowed by ruleset",
  89. "Network unreachable",
  90. "Host unreachable",
  91. "Connection refused",
  92. "TTL expired",
  93. "Command not supported",
  94. "Address type not supported",
  95. "Unknown error")
  96.  
  97. _socks5autherrors = ("succeeded",
  98. "authentication is required",
  99. "all offered authentication methods were rejected",
  100. "unknown username or invalid password",
  101. "unknown error")
  102.  
  103. _socks4errors = ("request granted",
  104. "request rejected or failed",
  105. "request rejected because SOCKS server cannot connect to identd on the client",
  106. "request rejected because the client program and identd report different user-ids",
  107. "unknown error")
  108.  
  109. def setdefaultproxy(proxytype=None,addr=None,port=None,rdns=True,username=None,password=None):
  110. """setdefaultproxy(proxytype, addr[, port[, rdns[, username[, password]]]])
  111. Sets a default proxy which all further socksocket objects will use,
  112. unless explicitly changed.
  113. """
  114. global _defaultproxy
  115. _defaultproxy = (proxytype,addr,port,rdns,username,password)
  116.  
  117. class socksocket(socket.socket):
  118. """socksocket([family[, type[, proto]]]) -> socket object
  119.  
  120. Open a SOCKS enabled socket. The parameters are the same as
  121. those of the standard socket init. In order for SOCKS to work,
  122. you must specify family=AF_INET, type=SOCK_STREAM and proto=0.
  123. """
  124.  
  125. def __init__(self, family=socket.AF_INET, type=socket.SOCK_STREAM, proto=0, _sock=None):
  126. _orgsocket.__init__(self,family,type,proto,_sock)
  127. if _defaultproxy != None:
  128. self.__proxy = _defaultproxy
  129. else:
  130. self.__proxy = (None, None, None, None, None, None)
  131. self.__proxysockname = None
  132. self.__proxypeername = None
  133.  
  134. def __recvall(self, bytes):
  135. """__recvall(bytes) -> data
  136. Receive EXACTLY the number of bytes requested from the socket.
  137. Blocks until the required number of bytes have been received.
  138. """
  139. data = ""
  140. while len(data) < bytes:
  141. data = data + self.recv(bytes-len(data))
  142. return data
  143.  
  144. def setproxy(self,proxytype=None,addr=None,port=None,rdns=True,username=None,password=None):
  145. """setproxy(proxytype, addr[, port[, rdns[, username[, password]]]])
  146. Sets the proxy to be used.
  147. proxytype - The type of the proxy to be used. Three types
  148. are supported: PROXY_TYPE_SOCKS4 (including socks4a),
  149. PROXY_TYPE_SOCKS5 and PROXY_TYPE_HTTP
  150. addr - The address of the server (IP or DNS).
  151. port - The port of the server. Defaults to 1080 for SOCKS
  152. servers and 8080 for HTTP proxy servers.
  153. rdns - Should DNS queries be preformed on the remote side
  154. (rather than the local side). The default is True.
  155. Note: This has no effect with SOCKS4 servers.
  156. username - Username to authenticate with to the server.
  157. The default is no authentication.
  158. password - Password to authenticate with to the server.
  159. Only relevant when username is also provided.
  160. """
  161. self.__proxy = (proxytype,addr,port,rdns,username,password)
  162.  
  163. def __negotiatesocks5(self,destaddr,destport):
  164. """__negotiatesocks5(self,destaddr,destport)
  165. Negotiates a connection through a SOCKS5 server.
  166. """
  167. # First we'll send the authentication packages we support.
  168. if (self.__proxy[4]!=None) and (self.__proxy[5]!=None):
  169. # The username/password details were supplied to the
  170. # setproxy method so we support the USERNAME/PASSWORD
  171. # authentication (in addition to the standard none).
  172. self.sendall("\x05\x02\x00\x02")
  173. else:
  174. # No username/password were entered, therefore we
  175. # only support connections with no authentication.
  176. self.sendall("\x05\x01\x00")
  177. # We'll receive the server's response to determine which
  178. # method was selected
  179. chosenauth = self.__recvall(2)
  180. if chosenauth[0] != "\x05":
  181. self.close()
  182. raise GeneralProxyError((1,_generalerrors[1]))
  183. # Check the chosen authentication method
  184. if chosenauth[1] == "\x00":
  185. # No authentication is required
  186. pass
  187. elif chosenauth[1] == "\x02":
  188. # Okay, we need to perform a basic username/password
  189. # authentication.
  190. self.sendall("\x01" + chr(len(self.__proxy[4])) + self.__proxy[4] + chr(len(self.proxy[5])) + self.__proxy[5])
  191. authstat = self.__recvall(2)
  192. if authstat[0] != "\x01":
  193. # Bad response
  194. self.close()
  195. raise GeneralProxyError((1,_generalerrors[1]))
  196. if authstat[1] != "\x00":
  197. # Authentication failed
  198. self.close()
  199. raise Socks5AuthError,((3,_socks5autherrors[3]))
  200. # Authentication succeeded
  201. else:
  202. # Reaching here is always bad
  203. self.close()
  204. if chosenauth[1] == "\xFF":
  205. raise Socks5AuthError((2,_socks5autherrors[2]))
  206. else:
  207. raise GeneralProxyError((1,_generalerrors[1]))
  208. # Now we can request the actual connection
  209. req = "\x05\x01\x00"
  210. # If the given destination address is an IP address, we'll
  211. # use the IPv4 address request even if remote resolving was specified.
  212. try:
  213. ipaddr = socket.inet_aton(destaddr)
  214. req = req + "\x01" + ipaddr
  215. except socket.error:
  216. # Well it's not an IP number, so it's probably a DNS name.
  217. if self.__proxy[3]==True:
  218. # Resolve remotely
  219. ipaddr = None
  220. req = req + "\x03" + chr(len(destaddr)) + destaddr
  221. else:
  222. # Resolve locally
  223. ipaddr = socket.inet_aton(socket.gethostbyname(destaddr))
  224. req = req + "\x01" + ipaddr
  225. req = req + struct.pack(">H",destport)
  226. self.sendall(req)
  227. # Get the response
  228. resp = self.__recvall(4)
  229. if resp[0] != "\x05":
  230. self.close()
  231. raise GeneralProxyError((1,_generalerrors[1]))
  232. elif resp[1] != "\x00":
  233. # Connection failed
  234. self.close()
  235. if ord(resp[1])<=8:
  236. raise Socks5Error(ord(resp[1]),_generalerrors[ord(resp[1])])
  237. else:
  238. raise Socks5Error(9,_generalerrors[9])
  239. # Get the bound address/port
  240. elif resp[3] == "\x01":
  241. boundaddr = self.__recvall(4)
  242. elif resp[3] == "\x03":
  243. resp = resp + self.recv(1)
  244. boundaddr = self.__recvall(resp[4])
  245. else:
  246. self.close()
  247. raise GeneralProxyError((1,_generalerrors[1]))
  248. boundport = struct.unpack(">H",self.__recvall(2))[0]
  249. self.__proxysockname = (boundaddr,boundport)
  250. if ipaddr != None:
  251. self.__proxypeername = (socket.inet_ntoa(ipaddr),destport)
  252. else:
  253. self.__proxypeername = (destaddr,destport)
  254.  
  255. def getproxysockname(self):
  256. """getsockname() -> address info
  257. Returns the bound IP address and port number at the proxy.
  258. """
  259. return self.__proxysockname
  260.  
  261. def getproxypeername(self):
  262. """getproxypeername() -> address info
  263. Returns the IP and port number of the proxy.
  264. """
  265. return _orgsocket.getpeername(self)
  266.  
  267. def getpeername(self):
  268. """getpeername() -> address info
  269. Returns the IP address and port number of the destination
  270. machine (note: getproxypeername returns the proxy)
  271. """
  272. return self.__proxypeername
  273.  
  274. def __negotiatesocks4(self,destaddr,destport):
  275. """__negotiatesocks4(self,destaddr,destport)
  276. Negotiates a connection through a SOCKS4 server.
  277. """
  278. # Check if the destination address provided is an IP address
  279. rmtrslv = False
  280. try:
  281. ipaddr = socket.inet_aton(destaddr)
  282. except socket.error:
  283. # It's a DNS name. Check where it should be resolved.
  284. if self.__proxy[3]==True:
  285. ipaddr = "\x00\x00\x00\x01"
  286. rmtrslv = True
  287. else:
  288. ipaddr = socket.inet_aton(socket.gethostbyname(destaddr))
  289. # Construct the request packet
  290. req = "\x04\x01" + struct.pack(">H",destport) + ipaddr
  291. # The username parameter is considered userid for SOCKS4
  292. if self.__proxy[4] != None:
  293. req = req + self.__proxy[4]
  294. req = req + "\x00"
  295. # DNS name if remote resolving is required
  296. # NOTE: This is actually an extension to the SOCKS4 protocol
  297. # called SOCKS4A and may not be supported in all cases.
  298. if rmtrslv==True:
  299. req = req + destaddr + "\x00"
  300. self.sendall(req)
  301. # Get the response from the server
  302. resp = self.__recvall(8)
  303. if resp[0] != "\x00":
  304. # Bad data
  305. self.close()
  306. raise GeneralProxyError((1,_generalerrors[1]))
  307. if resp[1] != "\x5A":
  308. # Server returned an error
  309. self.close()
  310. if ord(resp[1]) in (91,92,93):
  311. self.close()
  312. raise Socks4Error((ord(resp[1]),_socks4errors[ord(resp[1])-90]))
  313. else:
  314. raise Socks4Error((94,_socks4errors[4]))
  315. # Get the bound address/port
  316. self.__proxysockname = (socket.inet_ntoa(resp[4:]),struct.unpack(">H",resp[2:4])[0])
  317. if rmtrslv != None:
  318. self.__proxypeername = (socket.inet_ntoa(ipaddr),destport)
  319. else:
  320. self.__proxypeername = (destaddr,destport)
  321.  
  322. def __negotiatehttp(self,destaddr,destport):
  323. """__negotiatehttp(self,destaddr,destport)
  324. Negotiates a connection through an HTTP server.
  325. """
  326. # If we need to resolve locally, we do this now
  327. if self.__proxy[3] == False:
  328. addr = socket.gethostbyname(destaddr)
  329. else:
  330. addr = destaddr
  331. self.sendall("CONNECT " + addr + ":" + str(destport) + " HTTP/1.1\r\n" + "Host: " + destaddr + "\r\n\r\n")
  332. # We read the response until we get the string "\r\n\r\n"
  333. resp = self.recv(1)
  334. while resp.find("\r\n\r\n")==-1:
  335. resp = resp + self.recv(1)
  336. # We just need the first line to check if the connection
  337. # was successful
  338. statusline = resp.splitlines()[0].split(" ",2)
  339. if statusline[0] not in ("HTTP/1.0","HTTP/1.1"):
  340. self.close()
  341. raise GeneralProxyError((1,_generalerrors[1]))
  342. try:
  343. statuscode = int(statusline[1])
  344. except ValueError:
  345. self.close()
  346. raise GeneralProxyError((1,_generalerrors[1]))
  347. if statuscode != 200:
  348. self.close()
  349. raise HTTPError((statuscode,statusline[2]))
  350. self.__proxysockname = ("0.0.0.0",0)
  351. self.__proxypeername = (addr,destport)
  352.  
  353. def connect(self,destpair):
  354. """connect(self,despair)
  355. Connects to the specified destination through a proxy.
  356. destpar - A tuple of the IP/DNS address and the port number.
  357. (identical to socket's connect).
  358. To select the proxy server use setproxy().
  359. """
  360. # Do a minimal input check first
  361. if (type(destpair) in (list,tuple)==False) or (len(destpair)<2) or (type(destpair[0])!=str) or (type(destpair[1])!=int):
  362. raise GeneralProxyError((5,_generalerrors[5]))
  363. if self.__proxy[0] == PROXY_TYPE_SOCKS5:
  364. if self.__proxy[2] != None:
  365. portnum = self.__proxy[2]
  366. else:
  367. portnum = 1080
  368. _orgsocket.connect(self,(self.__proxy[1],portnum))
  369. self.__negotiatesocks5(destpair[0],destpair[1])
  370. elif self.__proxy[0] == PROXY_TYPE_SOCKS4:
  371. if self.__proxy[2] != None:
  372. portnum = self.__proxy[2]
  373. else:
  374. portnum = 1080
  375. _orgsocket.connect(self,(self.__proxy[1],portnum))
  376. self.__negotiatesocks4(destpair[0],destpair[1])
  377. elif self.__proxy[0] == PROXY_TYPE_HTTP:
  378. if self.__proxy[2] != None:
  379. portnum = self.__proxy[2]
  380. else:
  381. portnum = 8080
  382. _orgsocket.connect(self,(self.__proxy[1],portnum))
  383. self.__negotiatehttp(destpair[0],destpair[1])
  384. elif self.__proxy[0] == None:
  385. _orgsocket.connect(self,(destpair[0],destpair[1]))
  386. else:
  387. raise GeneralProxyError((4,_generalerrors[4]))
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