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#!/usr/bin/env python3
# Copyright (c) 2015-2019 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
"""Dummy Socks5 server for testing."""
import socket
import threading
import queue
import logging
logger = logging.getLogger("TestFramework.socks5")
# Protocol constants
class Command:
CONNECT = 0x01
class AddressType:
IPV4 = 0x01
DOMAINNAME = 0x03
IPV6 = 0x04
# Utility functions
def recvall(s, n):
"""Receive n bytes from a socket, or fail."""
rv = bytearray()
while n > 0:
d = s.recv(n)
if not d:
raise IOError('Unexpected end of stream')
rv.extend(d)
n -= len(d)
return rv
# Implementation classes
class Socks5Configuration():
"""Proxy configuration."""
def __init__(self):
self.addr = None # Bind address (must be set)
self.af = socket.AF_INET # Bind address family
self.unauth = False # Support unauthenticated
self.auth = False # Support authentication
self.keep_alive = False # Do not automatically close connections
class Socks5Command():
"""Information about an incoming socks5 command."""
def __init__(self, cmd, atyp, addr, port, username, password):
self.cmd = cmd # Command (one of Command.*)
self.atyp = atyp # Address type (one of AddressType.*)
self.addr = addr # Address
self.port = port # Port to connect to
self.username = username
self.password = password
def __repr__(self):
return 'Socks5Command(%s,%s,%s,%s,%s,%s)' % (self.cmd, self.atyp, self.addr, self.port, self.username, self.password)
class Socks5Connection():
def __init__(self, serv, conn):
self.serv = serv
self.conn = conn
def handle(self):
"""Handle socks5 request according to RFC192."""
try:
# Verify socks version
ver = recvall(self.conn, 1)[0]
if ver != 0x05:
raise IOError('Invalid socks version %i' % ver)
# Choose authentication method
nmethods = recvall(self.conn, 1)[0]
methods = bytearray(recvall(self.conn, nmethods))
method = None
if 0x02 in methods and self.serv.conf.auth:
method = 0x02 # username/password
elif 0x00 in methods and self.serv.conf.unauth:
method = 0x00 # unauthenticated
if method is None:
raise IOError('No supported authentication method was offered')
# Send response
self.conn.sendall(bytearray([0x05, method]))
# Read authentication (optional)
username = None
password = None
if method == 0x02:
ver = recvall(self.conn, 1)[0]
if ver != 0x01:
raise IOError('Invalid auth packet version %i' % ver)
ulen = recvall(self.conn, 1)[0]
username = str(recvall(self.conn, ulen))
plen = recvall(self.conn, 1)[0]
password = str(recvall(self.conn, plen))
# Send authentication response
self.conn.sendall(bytearray([0x01, 0x00]))
# Read connect request
ver, cmd, _, atyp = recvall(self.conn, 4)
if ver != 0x05:
raise IOError('Invalid socks version %i in connect request' % ver)
if cmd != Command.CONNECT:
raise IOError('Unhandled command %i in connect request' % cmd)
if atyp == AddressType.IPV4:
addr = recvall(self.conn, 4)
elif atyp == AddressType.DOMAINNAME:
n = recvall(self.conn, 1)[0]
addr = recvall(self.conn, n)
elif atyp == AddressType.IPV6:
addr = recvall(self.conn, 16)
else:
raise IOError('Unknown address type %i' % atyp)
port_hi,port_lo = recvall(self.conn, 2)
port = (port_hi << 8) | port_lo
# Send dummy response
self.conn.sendall(bytearray([0x05, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]))
cmdin = Socks5Command(cmd, atyp, addr, port, username, password)
self.serv.queue.put(cmdin)
logger.debug('Proxy: %s', cmdin)
# Fall through to disconnect
except Exception as e:
logger.exception("socks5 request handling failed.")
self.serv.queue.put(e)
finally:
if not self.serv.keep_alive:
self.conn.close()
class Socks5Server():
def __init__(self, conf):
self.conf = conf
self.s = socket.socket(conf.af)
self.s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self.s.bind(conf.addr)
self.s.listen(5)
self.running = False
self.thread = None
self.queue = queue.Queue() # report connections and exceptions to client
self.keep_alive = conf.keep_alive
def run(self):
while self.running:
(sockconn, _) = self.s.accept()
if self.running:
conn = Socks5Connection(self, sockconn)
thread = threading.Thread(None, conn.handle)
thread.daemon = True
thread.start()
def start(self):
assert not self.running
self.running = True
self.thread = threading.Thread(None, self.run)
self.thread.daemon = True
self.thread.start()
def stop(self):
self.running = False
# connect to self to end run loop
s = socket.socket(self.conf.af)
s.connect(self.conf.addr)
s.close()
self.thread.join()
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