Python port of ShadowsocksR
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#!/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
from shadowsocks.common import ord
def create_obfs(method):
return plain(method)
obfs_map = {
'plain': (create_obfs,),
'origin': (create_obfs,),
}
class plain(object):
def __init__(self, method):
self.method = method
self.server_info = None
def init_data(self):
return b''
def get_overhead(self, direction): # direction: true for c->s false for s->c
return 0
def get_server_info(self):
return self.server_info
def set_server_info(self, server_info):
self.server_info = server_info
def client_pre_encrypt(self, buf):
return buf
def client_encode(self, buf):
return buf
def client_decode(self, buf):
# (buffer_to_recv, is_need_to_encode_and_send_back)
return (buf, False)
def client_post_decrypt(self, buf):
return buf
def server_pre_encrypt(self, buf):
return buf
def server_encode(self, buf):
return buf
def server_decode(self, buf):
# (buffer_to_recv, is_need_decrypt, is_need_to_encode_and_send_back)
return (buf, True, False)
def server_post_decrypt(self, buf):
return (buf, False)
def client_udp_pre_encrypt(self, buf):
return buf
def client_udp_post_decrypt(self, buf):
return buf
def server_udp_pre_encrypt(self, buf):
return buf
def server_udp_post_decrypt(self, buf):
return (buf, None)
def dispose(self):
pass
def get_head_size(self, buf, def_value):
if len(buf) < 2:
return def_value
head_type = ord(buf[0]) & 0x7
if head_type == 1:
return 7
if head_type == 4:
return 19
if head_type == 3:
return 4 + ord(buf[1])
return def_value