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114 lines
3.3 KiB
114 lines
3.3 KiB
9 years ago
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#!/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 datetime
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import struct
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from shadowsocks.obfsplugin import plain
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from shadowsocks import common
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from shadowsocks.common import to_bytes, to_str, ord
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def create_verify_obfs(method):
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return verify_simple(method)
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obfs = {
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'verify_simple': (create_verify_obfs,),
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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 verify_simple(plain.plain):
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def __init__(self, method):
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self.method = method
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self.recv_buf = b''
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self.unit_len = 8100
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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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rnd_data = os.urandom(common.ord(os.urandom(1)[0]) % 16)
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data = common.chr(len(rnd_data) + 1) + rnd_data + buf
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data = struct.pack('>H', len(data) + 6) + data
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crc = (0xffffffff - binascii.crc32(data)) & 0xffffffff
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data += struct.pack('<I', crc)
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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_encode(self, buf):
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return buf
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def client_decode(self, buf):
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# (buffer_to_recv, is_need_to_encode_and_send_back)
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return (buf, False)
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def client_post_decrypt(self, buf):
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return 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_encode(self, buf):
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return buf
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def server_decode(self, buf):
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# (buffer_to_recv, is_need_decrypt, is_need_to_encode_and_send_back)
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return (buf, True, False)
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def server_post_decrypt(self, 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 >= 8192:
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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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if (binascii.crc32(self.recv_buf[:length]) & 0xffffffff) != 0xffffffff:
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raise Exception('server_post_decrype data uncorrect CRC32')
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pos = common.ord(self.recv_buf[2]) + 2
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out_buf += self.recv_buf[pos:length - 4]
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self.recv_buf = self.recv_buf[length:]
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return out_buf
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