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#!/usr/bin/env python

# Copyright (c) 2012 clowwindy
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.


import socket
import select
import SocketServer
import struct
import string
import hashlib
import sys
import os
import json
import logging

def get_table(key):
    m = hashlib.md5()
    m.update(key)
    s = m.digest()
    (a, b) = struct.unpack('<QQ', s)
    table = [c for c in string.maketrans('', '')]
    for i in xrange(1, 1024):
        table.sort(lambda x, y: int(a % (ord(x) + i) - a % (ord(y) + i)))
    return table


class ThreadingTCPServer(SocketServer.ThreadingMixIn, SocketServer.TCPServer):
    pass


class Socks5Server(SocketServer.StreamRequestHandler):
    def handle_tcp(self, sock, remote):
        try:
            fdset = [sock, remote]
            while True:
                r, w, e = select.select(fdset, [], [])
                if sock in r:
                    if remote.send(self.decrypt(sock.recv(4096))) <= 0:
                        break
                if remote in r:
                    if sock.send(self.encrypt(remote.recv(4096))) <= 0:
                        break
        finally:
            sock.close()
            remote.close()

    def encrypt(self, data):
        return data.translate(encrypt_table)

    def decrypt(self, data):
        return data.translate(decrypt_table)

    def handle(self):
        try:
            sock = self.connection
            addrtype = ord(self.decrypt(sock.recv(1)))
            if addrtype == 1:
                addr = socket.inet_ntoa(self.decrypt(self.rfile.read(4)))
            elif addrtype == 3:
                addr = self.decrypt(
                    self.rfile.read(ord(self.decrypt(sock.recv(1)))))
            else:
                # not support
                logging.warn('addr_type not support')
                return
            port = struct.unpack('>H', self.decrypt(self.rfile.read(2)))
            try:
                logging.info('connecting %s:%d' % (addr, port[0]))
                remote = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
                remote.connect((addr, port[0]))
            except socket.error as e:
                # Connection refused
                logging.warn('socket error ' + str(e))
                return
            self.handle_tcp(sock, remote)
        except socket.error as e:
            logging.warn('socket error ' + str(e))

if __name__ == '__main__':
    os.chdir(os.path.dirname(__file__) or '.')

    with open('config.json', 'rb') as f:
        config = json.load(f)
    SERVER = config['server']
    PORT = config['server_port']
    KEY = config['password']

    logging.basicConfig(level=logging.DEBUG, format='%(asctime)s %(levelname)-8s %(message)s',
        datefmt='%Y-%m-%d %H:%M:%S', filemode='a+')

    encrypt_table = ''.join(get_table(KEY))
    decrypt_table = string.maketrans(encrypt_table, string.maketrans('', ''))
    if '-6' in sys.argv[1:]:
        ThreadingTCPServer.address_family = socket.AF_INET6
    server = ThreadingTCPServer(('', PORT), Socks5Server)
    server.allow_reuse_address = True
    logging.info("starting server at port %d ..." % PORT)
    server.serve_forever()
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