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161 lines
5.6 KiB
161 lines
5.6 KiB
![]()
10 years ago
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# Copyright (c) 2015 The Bitcoin Core developers
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# Distributed under the MIT software license, see the accompanying
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# file COPYING or http://www.opensource.org/licenses/mit-license.php.
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'''
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Dummy Socks5 server for testing.
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'''
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from __future__ import print_function, division, unicode_literals
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import socket, threading, Queue
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import traceback, sys
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### Protocol constants
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class Command:
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CONNECT = 0x01
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class AddressType:
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IPV4 = 0x01
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DOMAINNAME = 0x03
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IPV6 = 0x04
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### Utility functions
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def recvall(s, n):
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'''Receive n bytes from a socket, or fail'''
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rv = bytearray()
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while n > 0:
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d = s.recv(n)
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if not d:
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raise IOError('Unexpected end of stream')
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rv.extend(d)
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n -= len(d)
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return rv
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### Implementation classes
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class Socks5Configuration(object):
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'''Proxy configuration'''
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def __init__(self):
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self.addr = None # Bind address (must be set)
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self.af = socket.AF_INET # Bind address family
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self.unauth = False # Support unauthenticated
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self.auth = False # Support authentication
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class Socks5Command(object):
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'''Information about an incoming socks5 command'''
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def __init__(self, cmd, atyp, addr, port, username, password):
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self.cmd = cmd # Command (one of Command.*)
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self.atyp = atyp # Address type (one of AddressType.*)
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self.addr = addr # Address
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self.port = port # Port to connect to
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self.username = username
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self.password = password
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def __repr__(self):
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return 'Socks5Command(%s,%s,%s,%s,%s,%s)' % (self.cmd, self.atyp, self.addr, self.port, self.username, self.password)
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class Socks5Connection(object):
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def __init__(self, serv, conn, peer):
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self.serv = serv
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self.conn = conn
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self.peer = peer
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def handle(self):
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'''
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Handle socks5 request according to RFC1928
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'''
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try:
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# Verify socks version
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ver = recvall(self.conn, 1)[0]
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if ver != 0x05:
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raise IOError('Invalid socks version %i' % ver)
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# Choose authentication method
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nmethods = recvall(self.conn, 1)[0]
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methods = bytearray(recvall(self.conn, nmethods))
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method = None
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if 0x02 in methods and self.serv.conf.auth:
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method = 0x02 # username/password
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elif 0x00 in methods and self.serv.conf.unauth:
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method = 0x00 # unauthenticated
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if method is None:
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raise IOError('No supported authentication method was offered')
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# Send response
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self.conn.sendall(bytearray([0x05, method]))
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# Read authentication (optional)
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username = None
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password = None
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if method == 0x02:
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ver = recvall(self.conn, 1)[0]
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if ver != 0x01:
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raise IOError('Invalid auth packet version %i' % ver)
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ulen = recvall(self.conn, 1)[0]
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username = str(recvall(self.conn, ulen))
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plen = recvall(self.conn, 1)[0]
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password = str(recvall(self.conn, plen))
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# Send authentication response
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self.conn.sendall(bytearray([0x01, 0x00]))
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# Read connect request
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(ver,cmd,rsv,atyp) = recvall(self.conn, 4)
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if ver != 0x05:
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raise IOError('Invalid socks version %i in connect request' % ver)
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if cmd != Command.CONNECT:
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raise IOError('Unhandled command %i in connect request' % cmd)
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if atyp == AddressType.IPV4:
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addr = recvall(self.conn, 4)
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elif atyp == AddressType.DOMAINNAME:
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n = recvall(self.conn, 1)[0]
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addr = str(recvall(self.conn, n))
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elif atyp == AddressType.IPV6:
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addr = recvall(self.conn, 16)
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else:
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raise IOError('Unknown address type %i' % atyp)
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port_hi,port_lo = recvall(self.conn, 2)
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port = (port_hi << 8) | port_lo
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# Send dummy response
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self.conn.sendall(bytearray([0x05, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]))
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cmdin = Socks5Command(cmd, atyp, addr, port, username, password)
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self.serv.queue.put(cmdin)
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print('Proxy: ', cmdin)
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# Fall through to disconnect
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except Exception,e:
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traceback.print_exc(file=sys.stderr)
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self.serv.queue.put(e)
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finally:
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self.conn.close()
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class Socks5Server(object):
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def __init__(self, conf):
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self.conf = conf
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self.s = socket.socket(conf.af)
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self.s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
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self.s.bind(conf.addr)
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self.s.listen(5)
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self.running = False
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self.thread = None
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self.queue = Queue.Queue() # report connections and exceptions to client
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def run(self):
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while self.running:
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(sockconn, peer) = self.s.accept()
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if self.running:
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conn = Socks5Connection(self, sockconn, peer)
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thread = threading.Thread(None, conn.handle)
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thread.daemon = True
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thread.start()
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def start(self):
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assert(not self.running)
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self.running = True
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self.thread = threading.Thread(None, self.run)
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self.thread.daemon = True
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self.thread.start()
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def stop(self):
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self.running = False
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# connect to self to end run loop
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s = socket.socket(self.conf.af)
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s.connect(self.conf.addr)
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s.close()
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self.thread.join()
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