shadowsocks/server.py

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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.
PORT = 8499
KEY = "foobar!"
import socket
import select
import SocketServer
import struct
import string
import hashlib
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import sys
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def get_table(key):
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m = hashlib.md5()
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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):
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pass
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class Socks5Server(SocketServer.StreamRequestHandler):
def handle_tcp(self, sock, remote):
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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:
remote.close()
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def encrypt(self, data):
return data.translate(encrypt_table)
def decrypt(self, data):
return data.translate(decrypt_table)
def send_encrpyt(self, sock, data):
sock.send(self.encrypt(data))
def handle(self):
try:
print 'socks connection from ', self.client_address
sock = self.connection
sock.recv(262)
self.send_encrpyt(sock, "\x05\x00")
data = self.decrypt(self.rfile.read(4))
mode = ord(data[1])
addrtype = ord(data[3])
if addrtype == 1:
addr = socket.inet_ntoa(self.decrypt(self.rfile.read(4)))
elif addrtype == 3:
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addr = self.decrypt(
self.rfile.read(ord(self.decrypt(sock.recv(1)))))
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else:
# not support
return
port = struct.unpack('>H', self.decrypt(self.rfile.read(2)))
reply = "\x05\x00\x00\x01"
try:
if mode == 1:
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remote = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
remote.connect((addr, port[0]))
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local = remote.getsockname()
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reply += socket.inet_aton(local[0]) + struct.pack(">H",
local[1])
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print 'Tcp connect to', addr, port[0]
else:
reply = "\x05\x07\x00\x01" # Command not supported
print 'command not supported'
except socket.error:
# Connection refused
reply = '\x05\x05\x00\x01\x00\x00\x00\x00\x00\x00'
self.send_encrpyt(sock, reply)
if reply[1] == '\x00':
if mode == 1:
self.handle_tcp(sock, remote)
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except socket.error as e:
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print 'socket error'
def main():
server = ThreadingTCPServer(('', PORT), Socks5Server)
server.allow_reuse_address = True
print "starting server at port %d ..." % PORT
server.serve_forever()
if __name__ == '__main__':
encrypt_table = ''.join(get_table(KEY))
decrypt_table = string.maketrans(encrypt_table, string.maketrans('', ''))
main()