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248 lines
7.9 KiB
248 lines
7.9 KiB
# Public Domain SOCKS proxy protocol implementation |
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# Adapted from https://gist.github.com/bluec0re/cafd3764412967417fd3 |
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from __future__ import unicode_literals |
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import collections |
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import socket |
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from .compat import ( |
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struct_pack, |
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struct_unpack, |
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) |
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__author__ = 'Timo Schmid <coding@timoschmid.de>' |
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class ProxyError(IOError): |
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pass |
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class Socks4Error(ProxyError): |
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CODES = { |
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0x5B: 'request rejected or failed', |
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0x5C: 'request rejected becasue SOCKS server cannot connect to identd on the client', |
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0x5D: 'request rejected because the client program and identd report different user-ids' |
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} |
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def __init__(self, code=None, msg=None): |
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if code is not None and msg is None: |
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msg = self.CODES.get(code) |
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if msg is None: |
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msg = 'unknown error' |
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super(Socks4Error, self).__init__(code, msg) |
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class Socks5Error(Socks4Error): |
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CODES = { |
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0x01: 'general SOCKS server failure', |
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0x02: 'connection not allowed by ruleset', |
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0x03: 'Network unreachable', |
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0x04: 'Host unreachable', |
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0x05: 'Connection refused', |
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0x06: 'TTL expired', |
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0x07: 'Command not supported', |
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0x08: 'Address type not supported', |
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0xFE: 'unknown username or invalid password', |
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0xFF: 'all offered authentication methods were rejected' |
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} |
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class ProxyType(object): |
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SOCKS4 = 0 |
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SOCKS4A = 1 |
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SOCKS5 = 2 |
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Proxy = collections.namedtuple('Proxy', ('type', 'host', 'port', 'username', 'password', 'remote_dns')) |
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class sockssocket(socket.socket): |
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@property |
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def _proxy(self): |
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return self.__proxy |
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@property |
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def _proxy_port(self): |
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if self._proxy: |
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if self._proxy.port: |
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return self._proxy.port |
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return 1080 |
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return None |
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def setproxy(self, proxytype=None, addr=None, port=None, rdns=True, username=None, password=None): |
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if proxytype is None: |
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self.__proxy = None |
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else: |
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self.__proxy = Proxy(proxytype, addr, port, username, password, rdns) |
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def recvall(self, cnt): |
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data = b'' |
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while len(data) < cnt: |
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cur = self.recv(cnt - len(data)) |
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if not cur: |
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raise IOError('{0} bytes missing'.format(cnt - len(data))) |
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data += cur |
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return data |
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def _setup_socks4(self, address, is_4a=False): |
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destaddr, port = address |
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try: |
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ipaddr = socket.inet_aton(destaddr) |
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except socket.error: |
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if is_4a and self._proxy.remote_dns: |
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ipaddr = struct_pack('!BBBB', 0, 0, 0, 0xFF) |
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else: |
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ipaddr = socket.inet_aton(socket.gethostbyname(destaddr)) |
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packet = struct_pack('!BBH', 0x4, 0x1, port) + ipaddr |
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if self._proxy.username: |
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username = self._proxy.username |
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if hasattr(username, 'encode'): |
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username = username.encode() |
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packet += struct_pack('!{0}s'.format(len(username) + 1), username) |
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else: |
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packet += b'\x00' |
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if is_4a and self._proxy.remote_dns: |
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if hasattr(destaddr, 'encode'): |
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destaddr = destaddr.encode() |
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packet += struct_pack('!{0}s'.format(len(destaddr) + 1), destaddr) |
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self.sendall(packet) |
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packet = self.recvall(8) |
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nbyte, resp_code, dstport, dsthost = struct_unpack('!BBHI', packet) |
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# check valid response |
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if nbyte != 0x00: |
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self.close() |
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raise ProxyError( |
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0, 'Invalid response from server. Expected {0:02x} got {1:02x}'.format(0, nbyte)) |
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# access granted |
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if resp_code != 0x5a: |
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self.close() |
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raise Socks4Error(resp_code) |
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return (dsthost, dstport) |
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def _setup_socks5(self, address): |
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destaddr, port = address |
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try: |
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ipaddr = socket.inet_aton(destaddr) |
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except socket.error: |
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if self._proxy.remote_dns: |
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ipaddr = None |
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else: |
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ipaddr = socket.inet_aton(socket.gethostbyname(destaddr)) |
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auth_methods = 1 |
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if self._proxy.username and self._proxy.password: |
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# two auth methods available |
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auth_methods = 2 |
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packet = struct_pack('!BBB', 0x5, auth_methods, 0x00) # no auth |
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if self._proxy.username and self._proxy.password: |
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packet += struct_pack('!B', 0x02) # user/pass auth |
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self.sendall(packet) |
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packet = self.recvall(2) |
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version, method = struct_unpack('!BB', packet) |
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# check valid response |
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if version != 0x05: |
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self.close() |
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raise ProxyError( |
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0, 'Invalid response from server. Expected {0:02x} got {1:02x}'.format(5, version)) |
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# no auth methods |
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if method == 0xFF: |
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self.close() |
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raise Socks5Error(method) |
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# user/pass auth |
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if method == 0x01: |
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username = self._proxy.username |
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if hasattr(username, 'encode'): |
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username = username.encode() |
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password = self._proxy.password |
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if hasattr(password, 'encode'): |
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password = password.encode() |
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packet = struct_pack('!BB', 1, len(username)) + username |
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packet += struct_pack('!B', len(password)) + password |
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self.sendall(packet) |
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packet = self.recvall(2) |
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version, status = struct_unpack('!BB', packet) |
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if version != 0x01: |
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self.close() |
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raise ProxyError( |
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0, 'Invalid response from server. Expected {0:02x} got {1:02x}'.format(1, version)) |
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if status != 0x00: |
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self.close() |
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raise Socks5Error(1) |
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elif method == 0x00: # no auth |
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pass |
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packet = struct_pack('!BBB', 5, 1, 0) |
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if ipaddr is None: |
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if hasattr(destaddr, 'encode'): |
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destaddr = destaddr.encode() |
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packet += struct_pack('!BB', 3, len(destaddr)) + destaddr |
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else: |
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packet += struct_pack('!B', 1) + ipaddr |
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packet += struct_pack('!H', port) |
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self.sendall(packet) |
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packet = self.recvall(4) |
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version, status, _, atype = struct_unpack('!BBBB', packet) |
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if version != 0x05: |
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self.close() |
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raise ProxyError( |
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0, 'Invalid response from server. Expected {0:02x} got {1:02x}'.format(5, version)) |
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if status != 0x00: |
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self.close() |
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raise Socks5Error(status) |
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if atype == 0x01: |
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destaddr = self.recvall(4) |
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elif atype == 0x03: |
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alen = struct_unpack('!B', self.recv(1))[0] |
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destaddr = self.recvall(alen) |
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elif atype == 0x04: |
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destaddr = self.recvall(16) |
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destport = struct_unpack('!H', self.recvall(2))[0] |
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return (destaddr, destport) |
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def _make_proxy(self, connect_func, address): |
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if self._proxy.type == ProxyType.SOCKS4: |
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result = connect_func(self, (self._proxy.host, self._proxy_port)) |
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if result != 0 and result is not None: |
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return result |
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self._setup_socks4(address) |
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elif self._proxy.type == ProxyType.SOCKS4A: |
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result = connect_func(self, (self._proxy.host, self._proxy_port)) |
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if result != 0 and result is not None: |
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return result |
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self._setup_socks4(address, is_4a=True) |
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elif self._proxy.type == ProxyType.SOCKS5: |
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result = connect_func(self, (self._proxy.host, self._proxy_port)) |
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if result != 0 and result is not None: |
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return result |
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self._setup_socks5(address) |
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else: |
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return connect_func(self, address) |
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def connect(self, address): |
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self._make_proxy(socket.socket.connect, address) |
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def connect_ex(self, address): |
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return self._make_proxy(socket.socket.connect_ex, address)
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