157 lines
5.5 KiB
157 lines
5.5 KiB
#!/usr/bin/env python3 |
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# Copyright (c) 2015-2016 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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"""Dummy Socks5 server for testing.""" |
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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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"""Handle socks5 request according to RFC192.""" |
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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 = 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 as 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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