Sovetnikov/socks.py

## socks.py
"""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.

"""

"""

Minor modifications made by Christopher Gilbert (http://motomastyle.com/)
for use in PyLoris (http://pyloris.sourceforge.net/)

Minor modifications made by Mario Vilas (http://breakingcode.wordpress.com/)
mainly to merge bug fixes found in Sourceforge

"""

__all__ = ('Proxy',
           'PROXY_TYPE_SOCKS4',
           'PROXY_TYPE_SOCKS5',
           'PROXY_TYPE_HTTP',
            'ProxyError',
            'GeneralProxyError',
            'Socks5AuthError',
            'Socks5Error',
            'Socks4Error',
            'HTTPError',
        )

import socket
import struct
import sys
import base64

PROXY_TYPE_SOCKS4 = 1
PROXY_TYPE_SOCKS5 = 2
PROXY_TYPE_HTTP = 3

_defaultproxy = None
_orgsocket = socket.socket

class ProxyError(Exception): pass
class GeneralProxyError(ProxyError): pass
class Socks5AuthError(ProxyError): pass
class Socks5Error(ProxyError): pass
class Socks4Error(ProxyError): pass
class HTTPError(ProxyError): pass

_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, count):
        """__recvall(count) -> data
        Receive EXACTLY the number of bytes requested from the socket.
        Blocks until the required number of bytes have been received.
        """
        data = self.recv(count)
        while len(data) < count:
            d = self.recv(count-len(data))
            if not d: raise GeneralProxyError((0, "connection closed unexpectedly"))
            data = data + d
        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(struct.pack('BBBB', 0x05, 0x02, 0x00, 0x02))
        else:
            # No username/password were entered, therefore we
            # only support connections with no authentication.
            self.sendall(struct.pack('BBB', 0x05, 0x01, 0x00))
        # We'll receive the server's response to determine which
        # method was selected
        chosenauth = self.__recvall(2)
        if chosenauth[0:1] != chr(0x05).encode():
            self.close()
            raise GeneralProxyError((1, _generalerrors[1]))
        # Check the chosen authentication method
        if chosenauth[1:2] == chr(0x00).encode():
            # No authentication is required
            pass
        elif chosenauth[1:2] == chr(0x02).encode():
            # Okay, we need to perform a basic username/password
            # authentication.
            self.sendall(chr(0x01).encode() + chr(len(self.__proxy[4])).encode() + self.__proxy[4].encode() + chr(len(self.__proxy[5])).encode() + self.__proxy[5].encode())
            authstat = self.__recvall(2)
            if authstat[0:1] != chr(0x01).encode():
                # Bad response
                self.close()
                raise GeneralProxyError((1, _generalerrors[1]))
            if authstat[1:2] != chr(0x00).encode():
                # Authentication failed
                self.close()
                raise Socks5AuthError((3, _socks5autherrors[3]))
            # Authentication succeeded
        else:
            # Reaching here is always bad
            self.close()
            if chosenauth[1] == chr(0xFF).encode():
                raise Socks5AuthError((2, _socks5autherrors[2]))
            else:
                raise GeneralProxyError((1, _generalerrors[1]))
        # Now we can request the actual connection
        req = struct.pack('BBB', 0x05, 0x01, 0x00)
        # 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 + chr(0x01).encode() + ipaddr
        except socket.error:
            # Well it's not an IP number,  so it's probably a DNS name.
            if self.__proxy[3]:
                # Resolve remotely
                ipaddr = None
                req = req + chr(0x03).encode() + chr(len(destaddr)).encode() + destaddr
            else:
                # Resolve locally
                ipaddr = socket.inet_aton(socket.gethostbyname(destaddr))
                req = req + chr(0x01).encode() + ipaddr
        req = req + struct.pack(">H", destport)
        self.sendall(req)
        # Get the response
        resp = self.__recvall(4)
        if resp[0:1] != chr(0x05).encode():
            self.close()
            raise GeneralProxyError((1, _generalerrors[1]))
        elif resp[1:2] != chr(0x00).encode():
            # Connection failed
            self.close()
            if ord(resp[1:2])<=8:
                raise Socks5Error((ord(resp[1:2]), _socks5errors[ord(resp[1:2])]))
            else:
                raise Socks5Error((9, _socks5errors[9]))
        # Get the bound address/port
        elif resp[3:4] == chr(0x01).encode():
            boundaddr = self.__recvall(4)
        elif resp[3:4] == chr(0x03).encode():
            resp = resp + self.recv(1)
            boundaddr = self.__recvall(ord(resp[4:5]))
        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]:
                ipaddr = struct.pack("BBBB", 0x00, 0x00, 0x00, 0x01)
                rmtrslv = True
            else:
                ipaddr = socket.inet_aton(socket.gethostbyname(destaddr))
        # Construct the request packet
        req = struct.pack(">BBH", 0x04, 0x01, destport) + ipaddr
        # The username parameter is considered userid for SOCKS4
        if self.__proxy[4] != None:
            req = req + self.__proxy[4].encode()
        req = req + chr(0x00).encode()
        # 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:
            req = req + destaddr + chr(0x00).encode()
        self.sendall(req)
        # Get the response from the server
        resp = self.__recvall(8)
        if resp[0:1] != chr(0x00).encode():
            # Bad data
            self.close()
            raise GeneralProxyError((1,_generalerrors[1]))
        if resp[1:2] != chr(0x5A).encode():
            # Server returned an error
            self.close()
            if ord(resp[1:2]) in (91, 92, 93):
                self.close()
                raise Socks4Error((ord(resp[1:2]), _socks4errors[ord(resp[1:2]) - 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 not self.__proxy[3]:
            addr = socket.gethostbyname(destaddr)
        else:
            addr = destaddr
        http_headers = [
            "CONNECT " + addr + ":" + str(destport) + " HTTP/1.1",
            #"Host: " + destaddr
        ]
        if self.__proxy[4] and self.__proxy[5]:
            auth = "%s:%s" % (self.__proxy[4], self.__proxy[5])
            auth = base64.b64encode(auth.encode()).decode()
            http_headers.append("Proxy-Authorization: basic %s" % auth)
        http_headers.append("\r\n")
        self.sendall("\r\n".join(http_headers).encode())

        # self.sendall(("CONNECT " + addr + ":" + str(destport) + " HTTP/1.1\r\n" + "Host: " + destaddr + "\r\n\r\n").encode())
        # We read the response until we get the string "\r\n\r\n"
        resp = self.recv(1)
        while resp.find("\r\n\r\n".encode()) == -1:
            _recvd = self.recv(1)
            if not _recvd:
                raise GeneralProxyError((2, _generalerrors[2]))
            resp = resp + _recvd
        # We just need the first line to check if the connection
        # was successful
        statusline = resp.splitlines()[0].split(" ".encode(), 2)
        if statusline[0] not in ("HTTP/1.0".encode(), "HTTP/1.1".encode()):
            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 (not type(destpair) in (list,tuple)) or (len(destpair) < 2) or (type(destpair[0]) != type('')) 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]))

class Proxy(object):
    def __init__(self, proxytype=None, addr=None, port=None, rdns=True, username=None, password=None):
        _setdefaultproxy(proxytype, addr, port, rdns, username, password)

    def __enter__(self):
        self._orig_socket = socket.socket
        socket.socket = socksocket

    def __exit__(self, exc_type, exc_val, exc_tb):
        if self._orig_socket:
            socket.socket = self._orig_socket
        _setdefaultproxy(None, None, None, None, None, None)

import ssl

try:
    import urllib2
    import httplib
except ImportError: # Python 3
    import urllib.request as urllib2
    import http.client as httplib

import socks # $ pip install PySocks

def merge_dict(a, b):
    d = a.copy()
    d.update(b)
    return d

class SocksiPyConnection(httplib.HTTPConnection):
    def __init__(self, proxytype, proxyaddr, proxyport=None, rdns=True, username=None, password=None, *args, **kwargs):
        self.proxyargs = (proxytype, proxyaddr, proxyport, rdns, username, password)
        httplib.HTTPConnection.__init__(self, *args, **kwargs)

    def connect(self):
        self.sock = socks.socksocket()
        self.sock.setproxy(*self.proxyargs)
        if type(self.timeout) in (int, float):
            self.sock.settimeout(self.timeout)
        self.sock.connect((self.host, self.port))

class SocksiPyConnectionS(httplib.HTTPSConnection):
    def __init__(self, proxytype, proxyaddr, proxyport=None, rdns=True, username=None, password=None, *args, **kwargs):
        self.proxyargs = (proxytype, proxyaddr, proxyport, rdns, username, password)
        httplib.HTTPSConnection.__init__(self, *args, **kwargs)

    def connect(self):
        sock = socks.socksocket()
        sock.setproxy(*self.proxyargs)
        if type(self.timeout) in (int, float):
            sock.settimeout(self.timeout)
        sock.connect((self.host, self.port))
        self.sock = ssl.wrap_socket(sock, self.key_file, self.cert_file)

class SocksiPyHandler(urllib2.HTTPHandler, urllib2.HTTPSHandler):
    def __init__(self, *args, **kwargs):
        self.args = args
        self.kw = kwargs
        urllib2.HTTPHandler.__init__(self)

    def http_open(self, req):
        def build(host, port=None, timeout=0, **kwargs):
            kw = merge_dict(self.kw, kwargs)
            conn = SocksiPyConnection(*self.args, host=host, port=port, timeout=timeout, **kw)
            return conn
        return self.do_open(build, req)

    def https_open(self, req):
        def build(host, port=None, timeout=0, **kwargs):
            kw = merge_dict(self.kw, kwargs)
            conn = SocksiPyConnectionS(*self.args, host=host, port=port, timeout=timeout, **kw)
            return conn
        return self.do_open(build, req)
	"""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.

	"""

	"""

	Minor modifications made by Christopher Gilbert (http://motomastyle.com/)
	for use in PyLoris (http://pyloris.sourceforge.net/)

	Minor modifications made by Mario Vilas (http://breakingcode.wordpress.com/)
	mainly to merge bug fixes found in Sourceforge

	"""

	__all__ = ('Proxy',
	'PROXY_TYPE_SOCKS4',
	'PROXY_TYPE_SOCKS5',
	'PROXY_TYPE_HTTP',
	'ProxyError',
	'GeneralProxyError',
	'Socks5AuthError',
	'Socks5Error',
	'Socks4Error',
	'HTTPError',
	)

	import socket
	import struct
	import sys
	import base64

	PROXY_TYPE_SOCKS4 = 1
	PROXY_TYPE_SOCKS5 = 2
	PROXY_TYPE_HTTP = 3

	_defaultproxy = None
	_orgsocket = socket.socket

	class ProxyError(Exception): pass
	class GeneralProxyError(ProxyError): pass
	class Socks5AuthError(ProxyError): pass
	class Socks5Error(ProxyError): pass
	class Socks4Error(ProxyError): pass
	class HTTPError(ProxyError): pass

	_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, count):
	"""__recvall(count) -> data
	Receive EXACTLY the number of bytes requested from the socket.
	Blocks until the required number of bytes have been received.
	"""
	data = self.recv(count)
	while len(data) < count:
	d = self.recv(count-len(data))
	if not d: raise GeneralProxyError((0, "connection closed unexpectedly"))
	data = data + d
	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(struct.pack('BBBB', 0x05, 0x02, 0x00, 0x02))
	else:
	# No username/password were entered, therefore we
	# only support connections with no authentication.
	self.sendall(struct.pack('BBB', 0x05, 0x01, 0x00))
	# We'll receive the server's response to determine which
	# method was selected
	chosenauth = self.__recvall(2)
	if chosenauth[0:1] != chr(0x05).encode():
	self.close()
	raise GeneralProxyError((1, _generalerrors[1]))
	# Check the chosen authentication method
	if chosenauth[1:2] == chr(0x00).encode():
	# No authentication is required
	pass
	elif chosenauth[1:2] == chr(0x02).encode():
	# Okay, we need to perform a basic username/password
	# authentication.
	self.sendall(chr(0x01).encode() + chr(len(self.__proxy[4])).encode() + self.__proxy[4].encode() + chr(len(self.__proxy[5])).encode() + self.__proxy[5].encode())
	authstat = self.__recvall(2)
	if authstat[0:1] != chr(0x01).encode():
	# Bad response
	self.close()
	raise GeneralProxyError((1, _generalerrors[1]))
	if authstat[1:2] != chr(0x00).encode():
	# Authentication failed
	self.close()
	raise Socks5AuthError((3, _socks5autherrors[3]))
	# Authentication succeeded
	else:
	# Reaching here is always bad
	self.close()
	if chosenauth[1] == chr(0xFF).encode():
	raise Socks5AuthError((2, _socks5autherrors[2]))
	else:
	raise GeneralProxyError((1, _generalerrors[1]))
	# Now we can request the actual connection
	req = struct.pack('BBB', 0x05, 0x01, 0x00)
	# 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 + chr(0x01).encode() + ipaddr
	except socket.error:
	# Well it's not an IP number, so it's probably a DNS name.
	if self.__proxy[3]:
	# Resolve remotely
	ipaddr = None
	req = req + chr(0x03).encode() + chr(len(destaddr)).encode() + destaddr
	else:
	# Resolve locally
	ipaddr = socket.inet_aton(socket.gethostbyname(destaddr))
	req = req + chr(0x01).encode() + ipaddr
	req = req + struct.pack(">H", destport)
	self.sendall(req)
	# Get the response
	resp = self.__recvall(4)
	if resp[0:1] != chr(0x05).encode():
	self.close()
	raise GeneralProxyError((1, _generalerrors[1]))
	elif resp[1:2] != chr(0x00).encode():
	# Connection failed
	self.close()
	if ord(resp[1:2])<=8:
	raise Socks5Error((ord(resp[1:2]), _socks5errors[ord(resp[1:2])]))
	else:
	raise Socks5Error((9, _socks5errors[9]))
	# Get the bound address/port
	elif resp[3:4] == chr(0x01).encode():
	boundaddr = self.__recvall(4)
	elif resp[3:4] == chr(0x03).encode():
	resp = resp + self.recv(1)
	boundaddr = self.__recvall(ord(resp[4:5]))
	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]:
	ipaddr = struct.pack("BBBB", 0x00, 0x00, 0x00, 0x01)
	rmtrslv = True
	else:
	ipaddr = socket.inet_aton(socket.gethostbyname(destaddr))
	# Construct the request packet
	req = struct.pack(">BBH", 0x04, 0x01, destport) + ipaddr
	# The username parameter is considered userid for SOCKS4
	if self.__proxy[4] != None:
	req = req + self.__proxy[4].encode()
	req = req + chr(0x00).encode()
	# 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:
	req = req + destaddr + chr(0x00).encode()
	self.sendall(req)
	# Get the response from the server
	resp = self.__recvall(8)
	if resp[0:1] != chr(0x00).encode():
	# Bad data
	self.close()
	raise GeneralProxyError((1,_generalerrors[1]))
	if resp[1:2] != chr(0x5A).encode():
	# Server returned an error
	self.close()
	if ord(resp[1:2]) in (91, 92, 93):
	self.close()
	raise Socks4Error((ord(resp[1:2]), _socks4errors[ord(resp[1:2]) - 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 not self.__proxy[3]:
	addr = socket.gethostbyname(destaddr)
	else:
	addr = destaddr
	http_headers = [
	"CONNECT " + addr + ":" + str(destport) + " HTTP/1.1",
	#"Host: " + destaddr
	]
	if self.__proxy[4] and self.__proxy[5]:
	auth = "%s:%s" % (self.__proxy[4], self.__proxy[5])
	auth = base64.b64encode(auth.encode()).decode()
	http_headers.append("Proxy-Authorization: basic %s" % auth)
	http_headers.append("\r\n")
	self.sendall("\r\n".join(http_headers).encode())

	# self.sendall(("CONNECT " + addr + ":" + str(destport) + " HTTP/1.1\r\n" + "Host: " + destaddr + "\r\n\r\n").encode())
	# We read the response until we get the string "\r\n\r\n"
	resp = self.recv(1)
	while resp.find("\r\n\r\n".encode()) == -1:
	_recvd = self.recv(1)
	if not _recvd:
	raise GeneralProxyError((2, _generalerrors[2]))
	resp = resp + _recvd
	# We just need the first line to check if the connection
	# was successful
	statusline = resp.splitlines()[0].split(" ".encode(), 2)
	if statusline[0] not in ("HTTP/1.0".encode(), "HTTP/1.1".encode()):
	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 (not type(destpair) in (list,tuple)) or (len(destpair) < 2) or (type(destpair[0]) != type('')) 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]))

	class Proxy(object):
	def __init__(self, proxytype=None, addr=None, port=None, rdns=True, username=None, password=None):
	_setdefaultproxy(proxytype, addr, port, rdns, username, password)

	def __enter__(self):
	self._orig_socket = socket.socket
	socket.socket = socksocket

	def __exit__(self, exc_type, exc_val, exc_tb):
	if self._orig_socket:
	socket.socket = self._orig_socket
	_setdefaultproxy(None, None, None, None, None, None)

	import ssl

	try:
	import urllib2
	import httplib
	except ImportError: # Python 3
	import urllib.request as urllib2
	import http.client as httplib

	import socks # $ pip install PySocks

	def merge_dict(a, b):
	d = a.copy()
	d.update(b)
	return d

	class SocksiPyConnection(httplib.HTTPConnection):
	def __init__(self, proxytype, proxyaddr, proxyport=None, rdns=True, username=None, password=None, args, *kwargs):
	self.proxyargs = (proxytype, proxyaddr, proxyport, rdns, username, password)
	httplib.HTTPConnection.__init__(self, args, *kwargs)

	def connect(self):
	self.sock = socks.socksocket()
	self.sock.setproxy(*self.proxyargs)
	if type(self.timeout) in (int, float):
	self.sock.settimeout(self.timeout)
	self.sock.connect((self.host, self.port))

	class SocksiPyConnectionS(httplib.HTTPSConnection):
	def __init__(self, proxytype, proxyaddr, proxyport=None, rdns=True, username=None, password=None, args, *kwargs):
	self.proxyargs = (proxytype, proxyaddr, proxyport, rdns, username, password)
	httplib.HTTPSConnection.__init__(self, args, *kwargs)

	def connect(self):
	sock = socks.socksocket()
	sock.setproxy(*self.proxyargs)
	if type(self.timeout) in (int, float):
	sock.settimeout(self.timeout)
	sock.connect((self.host, self.port))
	self.sock = ssl.wrap_socket(sock, self.key_file, self.cert_file)

	class SocksiPyHandler(urllib2.HTTPHandler, urllib2.HTTPSHandler):
	def __init__(self, args, *kwargs):
	self.args = args
	self.kw = kwargs
	urllib2.HTTPHandler.__init__(self)

	def http_open(self, req):
	def build(host, port=None, timeout=0, **kwargs):
	kw = merge_dict(self.kw, kwargs)
	conn = SocksiPyConnection(self.args, host=host, port=port, timeout=timeout, *kw)
	return conn
	return self.do_open(build, req)

	def https_open(self, req):
	def build(host, port=None, timeout=0, **kwargs):
	kw = merge_dict(self.kw, kwargs)
	conn = SocksiPyConnectionS(self.args, host=host, port=port, timeout=timeout, *kw)
	return conn
	return self.do_open(build, req)