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