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