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704 lines
28 KiB
704 lines
28 KiB
#!/usr/bin/python
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# -*- coding: utf-8 -*-
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# Copyright (c) 2014 clowwindy
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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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 traceback
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import random
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from shadowsocks import encrypt, eventloop, utils, common
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from shadowsocks.common import 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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# we check timeouts every TIMEOUT_PRECISION seconds
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TIMEOUT_PRECISION = 4
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MSG_FASTOPEN = 0x20000000
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# SOCKS CMD defination
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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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# TCP Relay can be either sslocal or ssserver
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# for sslocal it is called is_local=True
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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, we have 2 streams:
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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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# for each handler, it could be at one of several stages:
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# local:
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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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# remote:
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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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# stream direction
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STREAM_UP = 0
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STREAM_DOWN = 1
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# stream wait status, indicating it's waiting for reading, etc
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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._config = config
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self._dns_resolver = dns_resolver
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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._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._upstream_status = WAIT_STATUS_READING
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self._downstream_status = WAIT_STATUS_INIT
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self._remote_address = 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.last_activity = 0
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self._update_activity()
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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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logging.debug('chosen server: %s:%d', server, server_port)
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# TODO support multiple server IP
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return server, server_port
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def _update_activity(self):
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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)
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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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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 data or not sock:
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return False
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uncomplete = False
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try:
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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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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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logging.error(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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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 _handle_stage_connecting(self, data):
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if self._is_local:
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data = self._encryptor.encrypt(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)
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data = b''.join(self._data_to_write_to_local)
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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_local = [data]
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self._update_stream(STREAM_UP, WAIT_STATUS_READWRITING)
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else:
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self._data_to_write_to_local = []
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self._update_stream(STREAM_UP, WAIT_STATUS_READING)
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self._stage = STAGE_STREAM
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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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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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logging.error(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 _handle_stage_addr(self, 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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header_result = parse_header(data)
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if header_result is None:
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raise Exception('can not parse header')
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addrtype, remote_addr, remote_port, header_length = header_result
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logging.info('connecting %s:%d' % (common.to_str(remote_addr),
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remote_port))
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self._remote_address = (remote_addr, remote_port)
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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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data_to_send = self._encryptor.encrypt(data)
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self._data_to_write_to_remote.append(data_to_send)
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# notice here may go into _handle_dns_resolved directly
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self._dns_resolver.resolve(self._chosen_server[0],
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self._handle_dns_resolved)
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else:
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if len(data) > header_length:
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self._data_to_write_to_remote.append(data[header_length:])
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# notice here may go into _handle_dns_resolved directly
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self._dns_resolver.resolve(remote_addr,
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self._handle_dns_resolved)
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except Exception as e:
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logging.error(e)
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if self._config['verbose']:
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traceback.print_exc()
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# TODO use logging when debug completed
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self.destroy()
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def _create_remote_socket(self, ip, port):
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addrs = socket.getaddrinfo(ip, port, 0, socket.SOCK_STREAM,
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socket.SOL_TCP)
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if len(addrs) == 0:
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raise Exception("getaddrinfo failed for %s:%d" % (ip, port))
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af, socktype, proto, canonname, sa = addrs[0]
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remote_sock = socket.socket(af, socktype, proto)
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self._remote_sock = remote_sock
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self._fd_to_handlers[remote_sock.fileno()] = self
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remote_sock.setblocking(False)
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remote_sock.setsockopt(socket.SOL_TCP, socket.TCP_NODELAY, 1)
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return remote_sock
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def _handle_dns_resolved(self, result, error):
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if error:
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logging.error(error)
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self.destroy()
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return
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if result:
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ip = result[1]
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if ip:
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try:
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self._stage = STAGE_CONNECTING
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remote_addr = ip
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if self._is_local:
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remote_port = self._chosen_server[1]
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else:
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remote_port = self._remote_address[1]
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if self._is_local and self._config['fast_open']:
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# for fastopen:
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# wait for more data to arrive and send them in one SYN
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self._stage = STAGE_CONNECTING
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# we don't have to wait for remote since it's not
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# created
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self._update_stream(STREAM_UP, WAIT_STATUS_READING)
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# TODO when there is already data in this packet
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else:
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# else do connect
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remote_sock = self._create_remote_socket(remote_addr,
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remote_port)
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try:
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remote_sock.connect((remote_addr, remote_port))
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except (OSError, IOError) as e:
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if eventloop.errno_from_exception(e) == \
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errno.EINPROGRESS:
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pass
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self._loop.add(remote_sock,
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eventloop.POLL_ERR | eventloop.POLL_OUT)
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self._stage = STAGE_CONNECTING
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self._update_stream(STREAM_UP, WAIT_STATUS_READWRITING)
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self._update_stream(STREAM_DOWN, WAIT_STATUS_READING)
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return
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except (OSError, IOError) as e:
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logging.error(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 _on_local_read(self):
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# handle all local read events and dispatch them to methods for
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# each stage
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self._update_activity()
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if not self._local_sock:
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return
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is_local = self._is_local
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data = None
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try:
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data = self._local_sock.recv(BUF_SIZE)
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except (OSError, IOError) as e:
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if eventloop.errno_from_exception(e) in \
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(errno.ETIMEDOUT, errno.EAGAIN, errno.EWOULDBLOCK):
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return
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if not data:
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self.destroy()
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return
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if not is_local:
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data = self._encryptor.decrypt(data)
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if not data:
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return
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if self._stage == STAGE_STREAM:
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if self._is_local:
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data = self._encryptor.encrypt(data)
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self._write_to_sock(data, self._remote_sock)
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return
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elif is_local and self._stage == STAGE_INIT:
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# TODO check auth method
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self._write_to_sock(b'\x05\00', self._local_sock)
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self._stage = STAGE_ADDR
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return
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elif self._stage == STAGE_CONNECTING:
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self._handle_stage_connecting(data)
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elif (is_local and self._stage == STAGE_ADDR) or \
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(not is_local and self._stage == STAGE_INIT):
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self._handle_stage_addr(data)
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def _on_remote_read(self):
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# handle all remote read events
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self._update_activity()
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data = None
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try:
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data = self._remote_sock.recv(BUF_SIZE)
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except (OSError, IOError) as e:
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if eventloop.errno_from_exception(e) in \
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(errno.ETIMEDOUT, errno.EAGAIN, errno.EWOULDBLOCK):
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return
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if not data:
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self.destroy()
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return
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if self._is_local:
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data = self._encryptor.decrypt(data)
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else:
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data = self._encryptor.encrypt(data)
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try:
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self._write_to_sock(data, self._local_sock)
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except Exception as e:
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logging.error(e)
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if self._config['verbose']:
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traceback.print_exc()
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# TODO use logging when debug completed
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self.destroy()
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def _on_local_write(self):
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# handle local writable event
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if self._data_to_write_to_local:
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data = b''.join(self._data_to_write_to_local)
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self._data_to_write_to_local = []
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self._write_to_sock(data, self._local_sock)
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else:
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self._update_stream(STREAM_DOWN, WAIT_STATUS_READING)
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def _on_remote_write(self):
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# handle remote writable event
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self._stage = STAGE_STREAM
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if self._data_to_write_to_remote:
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data = b''.join(self._data_to_write_to_remote)
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self._data_to_write_to_remote = []
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self._write_to_sock(data, self._remote_sock)
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else:
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self._update_stream(STREAM_UP, WAIT_STATUS_READING)
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def _on_local_error(self):
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logging.debug('got local error')
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if self._local_sock:
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logging.error(eventloop.get_sock_error(self._local_sock))
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self.destroy()
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def _on_remote_error(self):
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logging.debug('got remote error')
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if self._remote_sock:
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logging.error(eventloop.get_sock_error(self._remote_sock))
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self.destroy()
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def handle_event(self, sock, event):
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# handle all events in this handler and dispatch them to methods
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if self._stage == STAGE_DESTROYED:
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logging.debug('ignore handle_event: destroyed')
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return
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# order is important
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if sock == self._remote_sock:
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if event & eventloop.POLL_ERR:
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self._on_remote_error()
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|
if self._stage == STAGE_DESTROYED:
|
|
return
|
|
if event & (eventloop.POLL_IN | eventloop.POLL_HUP):
|
|
self._on_remote_read()
|
|
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 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 have 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')
|
|
self._loop.remove(self._remote_sock)
|
|
del self._fd_to_handlers[self._remote_sock.fileno()]
|
|
self._remote_sock.close()
|
|
self._remote_sock = 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
|
|
self._dns_resolver.remove_callback(self._handle_dns_resolved)
|
|
self._server.remove_handler(self)
|
|
|
|
|
|
class TCPRelay(object):
|
|
def __init__(self, config, dns_resolver, is_local):
|
|
self._config = config
|
|
self._is_local = is_local
|
|
self._dns_resolver = dns_resolver
|
|
self._closed = False
|
|
self._eventloop = None
|
|
self._fd_to_handlers = {}
|
|
self._last_time = time.time()
|
|
|
|
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
|
|
|
|
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
|
|
loop.add_handler(self._handle_events)
|
|
|
|
self._eventloop.add(self._server_socket,
|
|
eventloop.POLL_IN | eventloop.POLL_ERR)
|
|
|
|
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 update_activity(self, handler):
|
|
# set handler to active
|
|
now = int(time.time())
|
|
if now - handler.last_activity < 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(utils.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_events(self, events):
|
|
# handle events and dispatch to handlers
|
|
for sock, fd, event in events:
|
|
if sock:
|
|
logging.log(utils.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):
|
|
continue
|
|
else:
|
|
logging.error(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')
|
|
|
|
now = time.time()
|
|
if now - self._last_time > TIMEOUT_PRECISION:
|
|
self._sweep_timeout()
|
|
self._last_time = now
|
|
if self._closed:
|
|
if self._server_socket:
|
|
self._eventloop.remove(self._server_socket)
|
|
self._server_socket.close()
|
|
self._server_socket = None
|
|
logging.info('closed listen port %d', self._listen_port)
|
|
if not self._fd_to_handlers:
|
|
self._eventloop.remove_handler(self._handle_events)
|
|
|
|
def close(self, next_tick=False):
|
|
self._closed = True
|
|
if not next_tick:
|
|
self._server_socket.close()
|
|
|