Python port of ShadowsocksR
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 

154 lines
4.3 KiB

#!/usr/bin/env python
#
# Copyright 2015-2015 breakwa11
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
from __future__ import absolute_import, division, print_function, \
with_statement
import os
import sys
import hashlib
import logging
import binascii
import base64
import time
import datetime
import random
import struct
import zlib
import hmac
import hashlib
import shadowsocks
from shadowsocks import common
from shadowsocks.obfsplugin import plain
from shadowsocks.common import to_bytes, to_str, ord, chr
def create_verify_deflate(method):
return verify_deflate(method)
obfs_map = {
'verify_deflate': (create_verify_deflate,),
}
def match_begin(str1, str2):
if len(str1) >= len(str2):
if str1[:len(str2)] == str2:
return True
return False
class obfs_verify_data(object):
def __init__(self):
pass
class verify_base(plain.plain):
def __init__(self, method):
super(verify_base, self).__init__(method)
self.method = method
def init_data(self):
return obfs_verify_data()
def set_server_info(self, server_info):
self.server_info = server_info
def client_encode(self, buf):
return buf
def client_decode(self, buf):
return (buf, False)
def server_encode(self, buf):
return buf
def server_decode(self, buf):
return (buf, True, False)
class verify_deflate(verify_base):
def __init__(self, method):
super(verify_deflate, self).__init__(method)
self.recv_buf = b''
self.unit_len = 32700
self.decrypt_packet_num = 0
self.raw_trans = False
def pack_data(self, buf):
if len(buf) == 0:
return b''
data = zlib.compress(buf)
data = struct.pack('>H', len(data)) + data[2:]
return data
def client_pre_encrypt(self, buf):
ret = b''
while len(buf) > self.unit_len:
ret += self.pack_data(buf[:self.unit_len])
buf = buf[self.unit_len:]
ret += self.pack_data(buf)
return ret
def client_post_decrypt(self, buf):
if self.raw_trans:
return buf
self.recv_buf += buf
out_buf = b''
while len(self.recv_buf) > 2:
length = struct.unpack('>H', self.recv_buf[:2])[0]
if length >= 32768 or length < 6:
self.raw_trans = True
self.recv_buf = b''
raise Exception('client_post_decrypt data error')
if length > len(self.recv_buf):
break
out_buf += zlib.decompress(b'x\x9c' + self.recv_buf[2:length])
self.recv_buf = self.recv_buf[length:]
if out_buf:
self.decrypt_packet_num += 1
return out_buf
def server_pre_encrypt(self, buf):
ret = b''
while len(buf) > self.unit_len:
ret += self.pack_data(buf[:self.unit_len])
buf = buf[self.unit_len:]
ret += self.pack_data(buf)
return ret
def server_post_decrypt(self, buf):
if self.raw_trans:
return (buf, False)
self.recv_buf += buf
out_buf = b''
while len(self.recv_buf) > 2:
length = struct.unpack('>H', self.recv_buf[:2])[0]
if length >= 32768 or length < 6:
self.raw_trans = True
self.recv_buf = b''
if self.decrypt_packet_num == 0:
return (b'E'*2048, False)
else:
raise Exception('server_post_decrype data error')
if length > len(self.recv_buf):
break
out_buf += zlib.decompress(b'\x78\x9c' + self.recv_buf[2:length])
self.recv_buf = self.recv_buf[length:]
if out_buf:
self.decrypt_packet_num += 1
return (out_buf, False)