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999 lines
41 KiB
999 lines
41 KiB
#!/usr/bin/python
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# -*- coding: utf-8 -*-
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#
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# Copyright 2015 clowwindy
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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 time
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import socket
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import errno
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import struct
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import logging
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import binascii
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import traceback
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import random
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from shadowsocks import encrypt, obfs, eventloop, shell, common
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from shadowsocks.common import pre_parse_header, parse_header
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# we clear at most TIMEOUTS_CLEAN_SIZE timeouts each time
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TIMEOUTS_CLEAN_SIZE = 512
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MSG_FASTOPEN = 0x20000000
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# SOCKS command definition
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CMD_CONNECT = 1
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CMD_BIND = 2
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CMD_UDP_ASSOCIATE = 3
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# for each opening port, we have a TCP Relay
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# for each connection, we have a TCP Relay Handler to handle the connection
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# for each handler, we have 2 sockets:
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# local: connected to the client
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# remote: connected to remote server
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# for each handler, it could be at one of several stages:
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# as sslocal:
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# stage 0 SOCKS hello received from local, send hello to local
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# stage 1 addr received from local, query DNS for remote
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# stage 2 UDP assoc
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# stage 3 DNS resolved, connect to remote
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# stage 4 still connecting, more data from local received
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# stage 5 remote connected, piping local and remote
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# as ssserver:
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# stage 0 just jump to stage 1
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# stage 1 addr received from local, query DNS for remote
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# stage 3 DNS resolved, connect to remote
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# stage 4 still connecting, more data from local received
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# stage 5 remote connected, piping local and remote
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STAGE_INIT = 0
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STAGE_ADDR = 1
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STAGE_UDP_ASSOC = 2
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STAGE_DNS = 3
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STAGE_CONNECTING = 4
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STAGE_STREAM = 5
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STAGE_DESTROYED = -1
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# for each handler, we have 2 stream directions:
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# upstream: from client to server direction
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# read local and write to remote
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# downstream: from server to client direction
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# read remote and write to local
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STREAM_UP = 0
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STREAM_DOWN = 1
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# for each stream, it's waiting for reading, or writing, or both
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WAIT_STATUS_INIT = 0
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WAIT_STATUS_READING = 1
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WAIT_STATUS_WRITING = 2
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WAIT_STATUS_READWRITING = WAIT_STATUS_READING | WAIT_STATUS_WRITING
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BUF_SIZE = 32 * 1024
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class TCPRelayHandler(object):
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def __init__(self, server, fd_to_handlers, loop, local_sock, config,
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dns_resolver, is_local):
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self._server = server
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self._fd_to_handlers = fd_to_handlers
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self._loop = loop
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self._local_sock = local_sock
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self._remote_sock = None
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self._remote_sock_v6 = None
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self._remote_udp = False
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self._config = config
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self._dns_resolver = dns_resolver
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# TCP Relay works as either sslocal or ssserver
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# if is_local, this is sslocal
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self._is_local = is_local
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self._stage = STAGE_INIT
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self._encryptor = encrypt.Encryptor(config['password'],
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config['method'])
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self._encrypt_correct = True
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self._obfs = obfs.obfs(config['obfs'])
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server_info = obfs.server_info(server.obfs_data)
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server_info.host = config['server']
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server_info.port = server._listen_port
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server_info.protocol_param = ''
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server_info.obfs_param = config['obfs_param']
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server_info.iv = self._encryptor.cipher_iv
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server_info.recv_iv = b''
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server_info.key = self._encryptor.cipher_key
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server_info.head_len = 30
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server_info.tcp_mss = 1440
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self._obfs.set_server_info(server_info)
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self._protocol = obfs.obfs(config['protocol'])
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server_info = obfs.server_info(server.protocol_data)
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server_info.host = config['server']
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server_info.port = server._listen_port
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server_info.protocol_param = config['protocol_param']
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server_info.obfs_param = ''
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server_info.iv = self._encryptor.cipher_iv
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server_info.recv_iv = b''
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server_info.key = self._encryptor.cipher_key
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server_info.head_len = 30
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server_info.tcp_mss = 1440
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self._protocol.set_server_info(server_info)
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self._redir_list = config.get('redirect', ["0.0.0.0:0"])
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self._fastopen_connected = False
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self._data_to_write_to_local = []
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self._data_to_write_to_remote = []
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self._udp_data_send_buffer = b''
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self._upstream_status = WAIT_STATUS_READING
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self._downstream_status = WAIT_STATUS_INIT
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self._client_address = local_sock.getpeername()[:2]
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self._remote_address = None
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if 'forbidden_ip' in config:
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self._forbidden_iplist = config['forbidden_ip']
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else:
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self._forbidden_iplist = None
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if is_local:
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self._chosen_server = self._get_a_server()
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fd_to_handlers[local_sock.fileno()] = self
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local_sock.setblocking(False)
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local_sock.setsockopt(socket.SOL_TCP, socket.TCP_NODELAY, 1)
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loop.add(local_sock, eventloop.POLL_IN | eventloop.POLL_ERR,
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self._server)
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self.last_activity = 0
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self._update_activity()
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self._server.add_connection(1)
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def __hash__(self):
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# default __hash__ is id / 16
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# we want to eliminate collisions
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return id(self)
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@property
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def remote_address(self):
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return self._remote_address
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def _get_a_server(self):
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server = self._config['server']
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server_port = self._config['server_port']
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if type(server_port) == list:
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server_port = random.choice(server_port)
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if type(server) == list:
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server = random.choice(server)
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logging.debug('chosen server: %s:%d', server, server_port)
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return server, server_port
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def _update_activity(self, data_len=0):
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# tell the TCP Relay we have activities recently
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# else it will think we are inactive and timed out
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self._server.update_activity(self, data_len)
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def _update_stream(self, stream, status):
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# update a stream to a new waiting status
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# check if status is changed
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# only update if dirty
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dirty = False
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if stream == STREAM_DOWN:
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if self._downstream_status != status:
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self._downstream_status = status
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dirty = True
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elif stream == STREAM_UP:
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if self._upstream_status != status:
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self._upstream_status = status
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dirty = True
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if dirty:
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if self._local_sock:
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event = eventloop.POLL_ERR
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if self._downstream_status & WAIT_STATUS_WRITING:
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event |= eventloop.POLL_OUT
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if self._upstream_status & WAIT_STATUS_READING:
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event |= eventloop.POLL_IN
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self._loop.modify(self._local_sock, event)
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if self._remote_sock:
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event = eventloop.POLL_ERR
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if self._downstream_status & WAIT_STATUS_READING:
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event |= eventloop.POLL_IN
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if self._upstream_status & WAIT_STATUS_WRITING:
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event |= eventloop.POLL_OUT
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self._loop.modify(self._remote_sock, event)
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if self._remote_sock_v6:
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self._loop.modify(self._remote_sock_v6, event)
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def _write_to_sock(self, data, sock):
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# write data to sock
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# if only some of the data are written, put remaining in the buffer
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# and update the stream to wait for writing
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if not sock:
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return False
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#logging.debug("_write_to_sock %s %s %s" % (self._remote_sock, sock, self._remote_udp))
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uncomplete = False
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if self._remote_udp and sock == self._remote_sock:
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try:
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self._udp_data_send_buffer += data
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#logging.info('UDP over TCP sendto %d %s' % (len(data), binascii.hexlify(data)))
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while len(self._udp_data_send_buffer) > 6:
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length = struct.unpack('>H', self._udp_data_send_buffer[:2])[0]
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if length > len(self._udp_data_send_buffer):
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break
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data = self._udp_data_send_buffer[:length]
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self._udp_data_send_buffer = self._udp_data_send_buffer[length:]
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frag = common.ord(data[2])
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if frag != 0:
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logging.warn('drop a message since frag is %d' % (frag,))
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continue
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else:
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data = data[3:]
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header_result = parse_header(data)
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if header_result is None:
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continue
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connecttype, dest_addr, dest_port, header_length = header_result
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addrs = socket.getaddrinfo(dest_addr, dest_port, 0,
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socket.SOCK_DGRAM, socket.SOL_UDP)
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#logging.info('UDP over TCP sendto %s:%d %d bytes from %s:%d' % (dest_addr, dest_port, len(data), self._client_address[0], self._client_address[1]))
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if addrs:
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af, socktype, proto, canonname, server_addr = addrs[0]
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data = data[header_length:]
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if af == socket.AF_INET6:
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self._remote_sock_v6.sendto(data, (server_addr[0], dest_port))
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else:
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sock.sendto(data, (server_addr[0], dest_port))
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except Exception as e:
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#trace = traceback.format_exc()
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#logging.error(trace)
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error_no = eventloop.errno_from_exception(e)
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if error_no in (errno.EAGAIN, errno.EINPROGRESS,
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errno.EWOULDBLOCK):
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uncomplete = True
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else:
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shell.print_exception(e)
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self.destroy()
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return False
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return True
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else:
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try:
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if self._encrypt_correct:
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if sock == self._remote_sock:
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self._server.server_transfer_ul += len(data)
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self._update_activity(len(data))
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elif not self._is_local and self._obfs is not None:
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obfs_encode = self._obfs.server_encode(data)
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data = obfs_encode
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if data:
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l = len(data)
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s = sock.send(data)
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if s < l:
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data = data[s:]
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uncomplete = True
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else:
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return
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except (OSError, IOError) as e:
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error_no = eventloop.errno_from_exception(e)
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if error_no in (errno.EAGAIN, errno.EINPROGRESS,
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errno.EWOULDBLOCK):
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uncomplete = True
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else:
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#traceback.print_exc()
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shell.print_exception(e)
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self.destroy()
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return False
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except Exception as e:
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shell.print_exception(e)
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self.destroy()
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return False
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if uncomplete:
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if sock == self._local_sock:
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self._data_to_write_to_local.append(data)
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self._update_stream(STREAM_DOWN, WAIT_STATUS_WRITING)
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elif sock == self._remote_sock:
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self._data_to_write_to_remote.append(data)
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self._update_stream(STREAM_UP, WAIT_STATUS_WRITING)
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else:
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logging.error('write_all_to_sock:unknown socket')
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else:
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if sock == self._local_sock:
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self._update_stream(STREAM_DOWN, WAIT_STATUS_READING)
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elif sock == self._remote_sock:
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self._update_stream(STREAM_UP, WAIT_STATUS_READING)
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else:
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logging.error('write_all_to_sock:unknown socket')
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return True
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def _get_redirect_host(self, client_address, ogn_data):
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host_list = self._redir_list or ["0.0.0.0:0"]
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hash_code = binascii.crc32(ogn_data)
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addrs = socket.getaddrinfo(client_address[0], client_address[1], 0, socket.SOCK_STREAM, socket.SOL_TCP)
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af, socktype, proto, canonname, sa = addrs[0]
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address_bytes = common.inet_pton(af, sa[0])
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if len(address_bytes) == 16:
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addr = struct.unpack('>Q', address_bytes[8:])[0]
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if len(address_bytes) == 4:
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addr = struct.unpack('>I', address_bytes)[0]
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else:
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addr = 0
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host_post = common.to_str(host_list[((hash_code & 0xffffffff) + addr) % len(host_list)])
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items = host_post.rsplit(':', 1)
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if len(items) > 1:
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try:
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return (items[0], int(items[1]))
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except:
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pass
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return (host_post, 80)
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def _handel_protocol_error(self, client_address, ogn_data):
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logging.warn("Protocol ERROR, TCP ogn data %s from %s:%d" % (binascii.hexlify(ogn_data), client_address[0], client_address[1]))
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self._encrypt_correct = False
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#create redirect or disconnect by hash code
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host, port = self._get_redirect_host(client_address, ogn_data)
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if port == 0:
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raise Exception('can not parse header')
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data = b"\x03" + common.chr(len(host)) + common.to_bytes(host) + struct.pack('>H', port)
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logging.warn("TCP data redir %s:%d %s" % (host, port, binascii.hexlify(data)))
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return data + ogn_data
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def _handle_stage_connecting(self, data):
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if self._is_local:
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if self._encryptor is not None:
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data = self._protocol.client_pre_encrypt(data)
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data = self._encryptor.encrypt(data)
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data = self._obfs.client_encode(data)
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if data:
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self._data_to_write_to_remote.append(data)
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if self._is_local and not self._fastopen_connected and \
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self._config['fast_open']:
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# for sslocal and fastopen, we basically wait for data and use
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# sendto to connect
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try:
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# only connect once
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self._fastopen_connected = True
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remote_sock = \
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self._create_remote_socket(self._chosen_server[0],
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self._chosen_server[1])
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self._loop.add(remote_sock, eventloop.POLL_ERR, self._server)
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data = b''.join(self._data_to_write_to_remote)
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l = len(data)
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s = remote_sock.sendto(data, MSG_FASTOPEN, self._chosen_server)
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if s < l:
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data = data[s:]
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self._data_to_write_to_remote = [data]
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else:
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self._data_to_write_to_remote = []
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self._update_stream(STREAM_UP, WAIT_STATUS_READWRITING)
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except (OSError, IOError) as e:
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if eventloop.errno_from_exception(e) == errno.EINPROGRESS:
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# in this case data is not sent at all
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self._update_stream(STREAM_UP, WAIT_STATUS_READWRITING)
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elif eventloop.errno_from_exception(e) == errno.ENOTCONN:
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logging.error('fast open not supported on this OS')
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self._config['fast_open'] = False
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self.destroy()
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else:
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shell.print_exception(e)
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if self._config['verbose']:
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traceback.print_exc()
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self.destroy()
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def _get_head_size(self, buf, def_value):
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if len(buf) < 2:
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return def_value
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head_type = ord(buf[0]) & 0xF
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if head_type == 1:
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return 7
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if head_type == 4:
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return 19
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if head_type == 3:
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return 4 + ord(buf[1])
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return def_value
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def _handle_stage_addr(self, ogn_data, data):
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try:
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if self._is_local:
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cmd = common.ord(data[1])
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if cmd == CMD_UDP_ASSOCIATE:
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logging.debug('UDP associate')
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if self._local_sock.family == socket.AF_INET6:
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header = b'\x05\x00\x00\x04'
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else:
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header = b'\x05\x00\x00\x01'
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addr, port = self._local_sock.getsockname()[:2]
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addr_to_send = socket.inet_pton(self._local_sock.family,
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addr)
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port_to_send = struct.pack('>H', port)
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self._write_to_sock(header + addr_to_send + port_to_send,
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self._local_sock)
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self._stage = STAGE_UDP_ASSOC
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# just wait for the client to disconnect
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return
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elif cmd == CMD_CONNECT:
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# just trim VER CMD RSV
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data = data[3:]
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else:
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logging.error('unknown command %d', cmd)
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self.destroy()
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return
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before_parse_data = data
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if self._is_local:
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header_result = parse_header(data)
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else:
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data = pre_parse_header(data)
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if data is None:
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data = self._handel_protocol_error(self._client_address, ogn_data)
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header_result = parse_header(data)
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if header_result is None:
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data = self._handel_protocol_error(self._client_address, ogn_data)
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header_result = parse_header(data)
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connecttype, remote_addr, remote_port, header_length = header_result
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logging.info('%s connecting %s:%d from %s:%d' %
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((connecttype == 0) and 'TCP' or 'UDP',
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common.to_str(remote_addr), remote_port,
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self._client_address[0], self._client_address[1]))
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self._remote_address = (common.to_str(remote_addr), remote_port)
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self._remote_udp = (connecttype != 0)
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# pause reading
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self._update_stream(STREAM_UP, WAIT_STATUS_WRITING)
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self._stage = STAGE_DNS
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if self._is_local:
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# forward address to remote
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self._write_to_sock((b'\x05\x00\x00\x01'
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b'\x00\x00\x00\x00\x10\x10'),
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self._local_sock)
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head_len = self._get_head_size(data, 30)
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self._obfs.obfs.server_info.head_len = head_len
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self._protocol.obfs.server_info.head_len = head_len
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if self._encryptor is not None:
|
|
data = self._protocol.client_pre_encrypt(data)
|
|
data_to_send = self._encryptor.encrypt(data)
|
|
data_to_send = self._obfs.client_encode(data_to_send)
|
|
if data_to_send:
|
|
self._data_to_write_to_remote.append(data_to_send)
|
|
# notice here may go into _handle_dns_resolved directly
|
|
self._dns_resolver.resolve(self._chosen_server[0],
|
|
self._handle_dns_resolved)
|
|
else:
|
|
if len(data) > header_length:
|
|
self._data_to_write_to_remote.append(data[header_length:])
|
|
# notice here may go into _handle_dns_resolved directly
|
|
self._dns_resolver.resolve(remote_addr,
|
|
self._handle_dns_resolved)
|
|
except Exception as e:
|
|
self._log_error(e)
|
|
if self._config['verbose']:
|
|
traceback.print_exc()
|
|
self.destroy()
|
|
|
|
def _create_remote_socket(self, ip, port):
|
|
if self._remote_udp:
|
|
addrs_v6 = socket.getaddrinfo("::", 0, 0, socket.SOCK_DGRAM, socket.SOL_UDP)
|
|
addrs = socket.getaddrinfo("0.0.0.0", 0, 0, socket.SOCK_DGRAM, socket.SOL_UDP)
|
|
else:
|
|
addrs = socket.getaddrinfo(ip, port, 0, socket.SOCK_STREAM, socket.SOL_TCP)
|
|
if len(addrs) == 0:
|
|
raise Exception("getaddrinfo failed for %s:%d" % (ip, port))
|
|
af, socktype, proto, canonname, sa = addrs[0]
|
|
if self._forbidden_iplist:
|
|
if common.to_str(sa[0]) in self._forbidden_iplist:
|
|
raise Exception('IP %s is in forbidden list, reject' %
|
|
common.to_str(sa[0]))
|
|
remote_sock = socket.socket(af, socktype, proto)
|
|
self._remote_sock = remote_sock
|
|
self._fd_to_handlers[remote_sock.fileno()] = self
|
|
|
|
if self._remote_udp:
|
|
af, socktype, proto, canonname, sa = addrs_v6[0]
|
|
remote_sock_v6 = socket.socket(af, socktype, proto)
|
|
self._remote_sock_v6 = remote_sock_v6
|
|
self._fd_to_handlers[remote_sock_v6.fileno()] = self
|
|
|
|
remote_sock.setblocking(False)
|
|
if self._remote_udp:
|
|
remote_sock_v6.setblocking(False)
|
|
else:
|
|
remote_sock.setsockopt(socket.SOL_TCP, socket.TCP_NODELAY, 1)
|
|
return remote_sock
|
|
|
|
def _handle_dns_resolved(self, result, error):
|
|
if error:
|
|
self._log_error(error)
|
|
self.destroy()
|
|
return
|
|
if result:
|
|
ip = result[1]
|
|
if ip:
|
|
|
|
try:
|
|
self._stage = STAGE_CONNECTING
|
|
remote_addr = ip
|
|
if self._is_local:
|
|
remote_port = self._chosen_server[1]
|
|
else:
|
|
remote_port = self._remote_address[1]
|
|
|
|
if self._is_local and self._config['fast_open']:
|
|
# for fastopen:
|
|
# wait for more data to arrive and send them in one SYN
|
|
self._stage = STAGE_CONNECTING
|
|
# we don't have to wait for remote since it's not
|
|
# created
|
|
self._update_stream(STREAM_UP, WAIT_STATUS_READING)
|
|
# TODO when there is already data in this packet
|
|
else:
|
|
# else do connect
|
|
remote_sock = self._create_remote_socket(remote_addr,
|
|
remote_port)
|
|
if self._remote_udp:
|
|
self._loop.add(remote_sock,
|
|
eventloop.POLL_IN,
|
|
self._server)
|
|
if self._remote_sock_v6:
|
|
self._loop.add(self._remote_sock_v6,
|
|
eventloop.POLL_IN,
|
|
self._server)
|
|
else:
|
|
try:
|
|
remote_sock.connect((remote_addr, remote_port))
|
|
except (OSError, IOError) as e:
|
|
if eventloop.errno_from_exception(e) in (errno.EINPROGRESS,
|
|
errno.EWOULDBLOCK):
|
|
pass # always goto here
|
|
else:
|
|
raise e
|
|
self._loop.add(remote_sock,
|
|
eventloop.POLL_ERR | eventloop.POLL_OUT,
|
|
self._server)
|
|
self._stage = STAGE_CONNECTING
|
|
self._update_stream(STREAM_UP, WAIT_STATUS_READWRITING)
|
|
self._update_stream(STREAM_DOWN, WAIT_STATUS_READING)
|
|
if self._remote_udp:
|
|
while self._data_to_write_to_remote:
|
|
data = self._data_to_write_to_remote[0]
|
|
del self._data_to_write_to_remote[0]
|
|
self._write_to_sock(data, self._remote_sock)
|
|
return
|
|
except Exception as e:
|
|
shell.print_exception(e)
|
|
if self._config['verbose']:
|
|
traceback.print_exc()
|
|
self.destroy()
|
|
|
|
def _on_local_read(self):
|
|
# handle all local read events and dispatch them to methods for
|
|
# each stage
|
|
if not self._local_sock:
|
|
return
|
|
is_local = self._is_local
|
|
data = None
|
|
try:
|
|
data = self._local_sock.recv(BUF_SIZE)
|
|
except (OSError, IOError) as e:
|
|
if eventloop.errno_from_exception(e) in \
|
|
(errno.ETIMEDOUT, errno.EAGAIN, errno.EWOULDBLOCK):
|
|
return
|
|
if not data:
|
|
self.destroy()
|
|
return
|
|
ogn_data = data
|
|
if not is_local:
|
|
if self._encryptor is not None:
|
|
if self._encrypt_correct:
|
|
try:
|
|
obfs_decode = self._obfs.server_decode(data)
|
|
except Exception as e:
|
|
shell.print_exception(e)
|
|
self.destroy()
|
|
if obfs_decode[2]:
|
|
self._write_to_sock(b'', self._local_sock)
|
|
if obfs_decode[1]:
|
|
if not self._protocol.obfs.server_info.recv_iv:
|
|
iv_len = len(self._protocol.obfs.server_info.iv)
|
|
self._protocol.obfs.server_info.recv_iv = obfs_decode[0][:iv_len]
|
|
data = self._encryptor.decrypt(obfs_decode[0])
|
|
else:
|
|
data = obfs_decode[0]
|
|
try:
|
|
data = self._protocol.server_post_decrypt(data)
|
|
except Exception as e:
|
|
shell.print_exception(e)
|
|
self.destroy()
|
|
else:
|
|
return
|
|
if not data:
|
|
return
|
|
if self._stage == STAGE_STREAM:
|
|
if self._is_local:
|
|
if self._encryptor is not None:
|
|
data = self._protocol.client_pre_encrypt(data)
|
|
data = self._encryptor.encrypt(data)
|
|
data = self._obfs.client_encode(data)
|
|
self._write_to_sock(data, self._remote_sock)
|
|
return
|
|
elif is_local and self._stage == STAGE_INIT:
|
|
# TODO check auth method
|
|
self._write_to_sock(b'\x05\00', self._local_sock)
|
|
self._stage = STAGE_ADDR
|
|
return
|
|
elif self._stage == STAGE_CONNECTING:
|
|
self._handle_stage_connecting(data)
|
|
elif (is_local and self._stage == STAGE_ADDR) or \
|
|
(not is_local and self._stage == STAGE_INIT):
|
|
self._handle_stage_addr(ogn_data, data)
|
|
|
|
def _on_remote_read(self, is_remote_sock):
|
|
# handle all remote read events
|
|
data = None
|
|
try:
|
|
if self._remote_udp:
|
|
if is_remote_sock:
|
|
data, addr = self._remote_sock.recvfrom(BUF_SIZE)
|
|
else:
|
|
data, addr = self._remote_sock_v6.recvfrom(BUF_SIZE)
|
|
port = struct.pack('>H', addr[1])
|
|
try:
|
|
ip = socket.inet_aton(addr[0])
|
|
data = b'\x00\x01' + ip + port + data
|
|
except Exception as e:
|
|
ip = socket.inet_pton(socket.AF_INET6, addr[0])
|
|
data = b'\x00\x04' + ip + port + data
|
|
data = struct.pack('>H', len(data) + 2) + data
|
|
#logging.info('UDP over TCP recvfrom %s:%d %d bytes to %s:%d' % (addr[0], addr[1], len(data), self._client_address[0], self._client_address[1]))
|
|
else:
|
|
data = self._remote_sock.recv(BUF_SIZE)
|
|
except (OSError, IOError) as e:
|
|
if eventloop.errno_from_exception(e) in \
|
|
(errno.ETIMEDOUT, errno.EAGAIN, errno.EWOULDBLOCK, 10035): #errno.WSAEWOULDBLOCK
|
|
return
|
|
if not data:
|
|
self.destroy()
|
|
return
|
|
if self._encryptor is not None:
|
|
if self._is_local:
|
|
try:
|
|
obfs_decode = self._obfs.client_decode(data)
|
|
except Exception as e:
|
|
shell.print_exception(e)
|
|
self.destroy()
|
|
if obfs_decode[1]:
|
|
send_back = self._obfs.client_encode(b'')
|
|
self._write_to_sock(send_back, self._remote_sock)
|
|
if not self._protocol.obfs.server_info.recv_iv:
|
|
iv_len = len(self._protocol.obfs.server_info.iv)
|
|
self._protocol.obfs.server_info.recv_iv = obfs_decode[0][:iv_len]
|
|
data = self._encryptor.decrypt(obfs_decode[0])
|
|
try:
|
|
data = self._protocol.client_post_decrypt(data)
|
|
except Exception as e:
|
|
shell.print_exception(e)
|
|
self.destroy()
|
|
else:
|
|
if self._encrypt_correct:
|
|
data = self._protocol.server_pre_encrypt(data)
|
|
data = self._encryptor.encrypt(data)
|
|
self._update_activity(len(data))
|
|
self._server.server_transfer_dl += len(data)
|
|
else:
|
|
return
|
|
try:
|
|
self._write_to_sock(data, self._local_sock)
|
|
except Exception as e:
|
|
shell.print_exception(e)
|
|
if self._config['verbose']:
|
|
traceback.print_exc()
|
|
# TODO use logging when debug completed
|
|
self.destroy()
|
|
|
|
def _on_local_write(self):
|
|
# handle local writable event
|
|
if self._data_to_write_to_local:
|
|
data = b''.join(self._data_to_write_to_local)
|
|
self._data_to_write_to_local = []
|
|
self._write_to_sock(data, self._local_sock)
|
|
else:
|
|
self._update_stream(STREAM_DOWN, WAIT_STATUS_READING)
|
|
|
|
def _on_remote_write(self):
|
|
# handle remote writable event
|
|
self._stage = STAGE_STREAM
|
|
if self._data_to_write_to_remote:
|
|
data = b''.join(self._data_to_write_to_remote)
|
|
self._data_to_write_to_remote = []
|
|
self._write_to_sock(data, self._remote_sock)
|
|
else:
|
|
self._update_stream(STREAM_UP, WAIT_STATUS_READING)
|
|
|
|
def _on_local_error(self):
|
|
logging.debug('got local error')
|
|
if self._local_sock:
|
|
logging.error(eventloop.get_sock_error(self._local_sock))
|
|
self.destroy()
|
|
|
|
def _on_remote_error(self):
|
|
logging.debug('got remote error')
|
|
if self._remote_sock:
|
|
logging.error(eventloop.get_sock_error(self._remote_sock))
|
|
self.destroy()
|
|
|
|
def handle_event(self, sock, event):
|
|
# handle all events in this handler and dispatch them to methods
|
|
if self._stage == STAGE_DESTROYED:
|
|
logging.debug('ignore handle_event: destroyed')
|
|
return
|
|
# order is important
|
|
if sock == self._remote_sock or sock == self._remote_sock_v6:
|
|
if event & eventloop.POLL_ERR:
|
|
self._on_remote_error()
|
|
if self._stage == STAGE_DESTROYED:
|
|
return
|
|
if event & (eventloop.POLL_IN | eventloop.POLL_HUP):
|
|
self._on_remote_read(sock == self._remote_sock)
|
|
if self._stage == STAGE_DESTROYED:
|
|
return
|
|
if event & eventloop.POLL_OUT:
|
|
self._on_remote_write()
|
|
elif sock == self._local_sock:
|
|
if event & eventloop.POLL_ERR:
|
|
self._on_local_error()
|
|
if self._stage == STAGE_DESTROYED:
|
|
return
|
|
if event & (eventloop.POLL_IN | eventloop.POLL_HUP):
|
|
self._on_local_read()
|
|
if self._stage == STAGE_DESTROYED:
|
|
return
|
|
if event & eventloop.POLL_OUT:
|
|
self._on_local_write()
|
|
else:
|
|
logging.warn('unknown socket')
|
|
|
|
def _log_error(self, e):
|
|
logging.error('%s when handling connection from %s:%d' %
|
|
(e, self._client_address[0], self._client_address[1]))
|
|
|
|
def destroy(self):
|
|
# destroy the handler and release any resources
|
|
# promises:
|
|
# 1. destroy won't make another destroy() call inside
|
|
# 2. destroy releases resources so it prevents future call to destroy
|
|
# 3. destroy won't raise any exceptions
|
|
# if any of the promises are broken, it indicates a bug has been
|
|
# introduced! mostly likely memory leaks, etc
|
|
if self._stage == STAGE_DESTROYED:
|
|
# this couldn't happen
|
|
logging.debug('already destroyed')
|
|
return
|
|
self._stage = STAGE_DESTROYED
|
|
if self._remote_address:
|
|
logging.debug('destroy: %s:%d' %
|
|
self._remote_address)
|
|
else:
|
|
logging.debug('destroy')
|
|
if self._remote_sock:
|
|
logging.debug('destroying remote')
|
|
try:
|
|
self._loop.remove(self._remote_sock)
|
|
except Exception as e:
|
|
pass
|
|
del self._fd_to_handlers[self._remote_sock.fileno()]
|
|
self._remote_sock.close()
|
|
self._remote_sock = None
|
|
if self._remote_sock_v6:
|
|
logging.debug('destroying remote')
|
|
try:
|
|
self._loop.remove(self._remote_sock_v6)
|
|
except Exception as e:
|
|
pass
|
|
del self._fd_to_handlers[self._remote_sock_v6.fileno()]
|
|
self._remote_sock_v6.close()
|
|
self._remote_sock_v6 = None
|
|
if self._local_sock:
|
|
logging.debug('destroying local')
|
|
self._loop.remove(self._local_sock)
|
|
del self._fd_to_handlers[self._local_sock.fileno()]
|
|
self._local_sock.close()
|
|
self._local_sock = None
|
|
if self._obfs:
|
|
self._obfs.dispose()
|
|
self._obfs = None
|
|
if self._protocol:
|
|
self._protocol.dispose()
|
|
self._protocol = None
|
|
self._encryptor = None
|
|
self._dns_resolver.remove_callback(self._handle_dns_resolved)
|
|
self._server.remove_handler(self)
|
|
self._server.add_connection(-1)
|
|
|
|
class TCPRelay(object):
|
|
def __init__(self, config, dns_resolver, is_local, stat_callback=None):
|
|
self._config = config
|
|
self._is_local = is_local
|
|
self._dns_resolver = dns_resolver
|
|
self._closed = False
|
|
self._eventloop = None
|
|
self._fd_to_handlers = {}
|
|
self.server_transfer_ul = 0
|
|
self.server_transfer_dl = 0
|
|
self.server_connections = 0
|
|
self.protocol_data = obfs.obfs(config['protocol']).init_data()
|
|
self.obfs_data = obfs.obfs(config['obfs']).init_data()
|
|
|
|
self._timeout = config['timeout']
|
|
self._timeouts = [] # a list for all the handlers
|
|
# we trim the timeouts once a while
|
|
self._timeout_offset = 0 # last checked position for timeout
|
|
self._handler_to_timeouts = {} # key: handler value: index in timeouts
|
|
|
|
if is_local:
|
|
listen_addr = config['local_address']
|
|
listen_port = config['local_port']
|
|
else:
|
|
listen_addr = config['server']
|
|
listen_port = config['server_port']
|
|
self._listen_port = listen_port
|
|
|
|
addrs = socket.getaddrinfo(listen_addr, listen_port, 0,
|
|
socket.SOCK_STREAM, socket.SOL_TCP)
|
|
if len(addrs) == 0:
|
|
raise Exception("can't get addrinfo for %s:%d" %
|
|
(listen_addr, listen_port))
|
|
af, socktype, proto, canonname, sa = addrs[0]
|
|
server_socket = socket.socket(af, socktype, proto)
|
|
server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
|
|
server_socket.bind(sa)
|
|
server_socket.setblocking(False)
|
|
if config['fast_open']:
|
|
try:
|
|
server_socket.setsockopt(socket.SOL_TCP, 23, 5)
|
|
except socket.error:
|
|
logging.error('warning: fast open is not available')
|
|
self._config['fast_open'] = False
|
|
server_socket.listen(1024)
|
|
self._server_socket = server_socket
|
|
self._stat_callback = stat_callback
|
|
|
|
def add_to_loop(self, loop):
|
|
if self._eventloop:
|
|
raise Exception('already add to loop')
|
|
if self._closed:
|
|
raise Exception('already closed')
|
|
self._eventloop = loop
|
|
self._eventloop.add(self._server_socket,
|
|
eventloop.POLL_IN | eventloop.POLL_ERR, self)
|
|
self._eventloop.add_periodic(self.handle_periodic)
|
|
|
|
def remove_handler(self, handler):
|
|
index = self._handler_to_timeouts.get(hash(handler), -1)
|
|
if index >= 0:
|
|
# delete is O(n), so we just set it to None
|
|
self._timeouts[index] = None
|
|
del self._handler_to_timeouts[hash(handler)]
|
|
|
|
def add_connection(self, val):
|
|
self.server_connections += val
|
|
logging.debug('server port %5d connections = %d' % (self._listen_port, self.server_connections,))
|
|
|
|
def update_activity(self, handler, data_len):
|
|
if data_len and self._stat_callback:
|
|
self._stat_callback(self._listen_port, data_len)
|
|
|
|
# set handler to active
|
|
now = int(time.time())
|
|
if now - handler.last_activity < eventloop.TIMEOUT_PRECISION:
|
|
# thus we can lower timeout modification frequency
|
|
return
|
|
handler.last_activity = now
|
|
index = self._handler_to_timeouts.get(hash(handler), -1)
|
|
if index >= 0:
|
|
# delete is O(n), so we just set it to None
|
|
self._timeouts[index] = None
|
|
length = len(self._timeouts)
|
|
self._timeouts.append(handler)
|
|
self._handler_to_timeouts[hash(handler)] = length
|
|
|
|
def _sweep_timeout(self):
|
|
# tornado's timeout memory management is more flexible than we need
|
|
# we just need a sorted last_activity queue and it's faster than heapq
|
|
# in fact we can do O(1) insertion/remove so we invent our own
|
|
if self._timeouts:
|
|
logging.log(shell.VERBOSE_LEVEL, 'sweeping timeouts')
|
|
now = time.time()
|
|
length = len(self._timeouts)
|
|
pos = self._timeout_offset
|
|
while pos < length:
|
|
handler = self._timeouts[pos]
|
|
if handler:
|
|
if now - handler.last_activity < self._timeout:
|
|
break
|
|
else:
|
|
if handler.remote_address:
|
|
logging.warn('timed out: %s:%d' %
|
|
handler.remote_address)
|
|
else:
|
|
logging.warn('timed out')
|
|
handler.destroy()
|
|
self._timeouts[pos] = None # free memory
|
|
pos += 1
|
|
else:
|
|
pos += 1
|
|
if pos > TIMEOUTS_CLEAN_SIZE and pos > length >> 1:
|
|
# clean up the timeout queue when it gets larger than half
|
|
# of the queue
|
|
self._timeouts = self._timeouts[pos:]
|
|
for key in self._handler_to_timeouts:
|
|
self._handler_to_timeouts[key] -= pos
|
|
pos = 0
|
|
self._timeout_offset = pos
|
|
|
|
def handle_event(self, sock, fd, event):
|
|
# handle events and dispatch to handlers
|
|
if sock:
|
|
logging.log(shell.VERBOSE_LEVEL, 'fd %d %s', fd,
|
|
eventloop.EVENT_NAMES.get(event, event))
|
|
if sock == self._server_socket:
|
|
if event & eventloop.POLL_ERR:
|
|
# TODO
|
|
raise Exception('server_socket error')
|
|
try:
|
|
logging.debug('accept')
|
|
conn = self._server_socket.accept()
|
|
TCPRelayHandler(self, self._fd_to_handlers,
|
|
self._eventloop, conn[0], self._config,
|
|
self._dns_resolver, self._is_local)
|
|
except (OSError, IOError) as e:
|
|
error_no = eventloop.errno_from_exception(e)
|
|
if error_no in (errno.EAGAIN, errno.EINPROGRESS,
|
|
errno.EWOULDBLOCK):
|
|
return
|
|
else:
|
|
shell.print_exception(e)
|
|
if self._config['verbose']:
|
|
traceback.print_exc()
|
|
else:
|
|
if sock:
|
|
handler = self._fd_to_handlers.get(fd, None)
|
|
if handler:
|
|
handler.handle_event(sock, event)
|
|
else:
|
|
logging.warn('poll removed fd')
|
|
|
|
def handle_periodic(self):
|
|
if self._closed:
|
|
if self._server_socket:
|
|
self._eventloop.remove(self._server_socket)
|
|
self._server_socket.close()
|
|
self._server_socket = None
|
|
logging.info('closed TCP port %d', self._listen_port)
|
|
if not self._fd_to_handlers:
|
|
logging.info('stopping')
|
|
self._eventloop.stop()
|
|
self._sweep_timeout()
|
|
|
|
def close(self, next_tick=False):
|
|
logging.debug('TCP close')
|
|
self._closed = True
|
|
if not next_tick:
|
|
if self._eventloop:
|
|
self._eventloop.remove_periodic(self.handle_periodic)
|
|
self._eventloop.remove(self._server_socket)
|
|
self._server_socket.close()
|
|
for handler in list(self._fd_to_handlers.values()):
|
|
handler.destroy()
|
|
|