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289 lines
10 KiB
289 lines
10 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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import time
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import socket
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import logging
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import encrypt
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import errno
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import eventloop
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from common import parse_header
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# local:
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# stage 0 init
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# stage 1 hello received, hello sent
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# stage 4 addr received, reply sent
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# stage 5 remote connected
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# remote:
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# stage 0 init
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# stage 4 addr received, reply sent
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# stage 5 remote connected
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BUF_SIZE = 8 * 1024
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class TCPRelayHandler(object):
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def __init__(self, fd_to_handlers, loop, local_sock, config, is_local):
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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._is_local = is_local
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self._stage = 0
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self._encryptor = encrypt.Encryptor(config['password'],
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config['method'])
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self._data_to_write_to_local = []
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self._data_to_write_to_remote = []
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fd_to_handlers[local_sock.fileno()] = self
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local_sock.setblocking(False)
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loop.add(local_sock, eventloop.POLL_IN)
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def resume_reading(self, sock):
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pass
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def pause_reading(self, sock):
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pass
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def resume_writing(self, sock):
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pass
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def pause_writing(self, sock):
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pass
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def write_all_to_sock(self, data, sock):
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# write to sock
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# put remaining bytes into buffer
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# return true if all written
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# return false if some bytes left in buffer
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# raise if encounter error
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return True
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def on_local_read(self):
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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 = self._local_sock.recv(BUF_SIZE)
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if not is_local:
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data = self._encryptor.decrypt(data)
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if self._stage == 5:
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if self._is_local:
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data = self._encryptor.encrypt(data)
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if not self.write_all_to_sock(data, self._remote_sock):
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self.pause_reading(self._local_sock)
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return
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if is_local and self._stage == 0:
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# TODO check auth method
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self.write_all_to_sock('\x05\00', self._local_sock)
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self._stage = 1
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return
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if self._stage == 4:
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self._data_to_write_to_remote.append(data)
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if (is_local and self._stage == 0) or \
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(not is_local and self._stage == 1):
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try:
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if is_local:
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cmd = ord(data[1])
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# TODO check cmd == 1
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assert cmd == 1
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# just trim VER CMD RSV
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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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raise Exception('can not parse header')
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addrtype, remote_addr, remote_port, header_length =\
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header_result
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logging.info('connecting %s:%d' % (remote_addr, remote_port))
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if is_local:
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# forward address to remote
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self._data_to_write_to_remote.append(data[:header_length])
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self.write_all_to_sock('\x05\x00\x00\x01' +
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'\x00\x00\x00\x00\x10\x10',
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self._local_sock)
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else:
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remote_addr = self._config['server']
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remote_port = self._config['server_port']
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# TODO async DNS
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addrs = socket.getaddrinfo(remote_addr, remote_port, 0,
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socket.SOCK_STREAM, socket.SOL_TCP)
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if len(addrs) == 0:
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raise Exception("can't get addrinfo for %s:%d" %
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(remote_addr, remote_port))
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af, socktype, proto, canonname, sa = addrs[0]
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self._remote_sock = socket.socket(af, socktype, proto)
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self._remote_sock.setblocking(False)
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# TODO support TCP fast open
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self._remote_sock.connect(sa)
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self._loop.add(self._remote_sock, eventloop.POLL_OUT)
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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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self._stage = 4
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self.pause_reading(self._local_sock)
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return
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except Exception:
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import traceback
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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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if self._stage == 4:
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self._data_to_write_to_remote.append(data)
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def on_remote_read(self):
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data = self._remote_sock.recv(BUF_SIZE)
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if self._is_local:
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data = self._encryptor.decrypt(data)
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try:
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if not self.write_all_to_sock(data, self._local_sock):
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self.pause_reading(self._remote_sock)
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self.resume_writing(self._local_sock)
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except Exception:
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import traceback
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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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if self._data_to_write_to_local:
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written = self.write_all_to_sock(
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''.join(self._data_to_write_to_local), self._local_sock)
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if written:
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self.pause_writing(self._local_sock)
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else:
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self.pause_writing(self._local_sock)
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def on_remote_write(self):
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if self._data_to_write_to_remote:
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written = self.write_all_to_sock(
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''.join(self._data_to_write_to_remote), self._remote_sock)
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if written:
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self.pause_writing(self._remote_sock)
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else:
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self.pause_writing(self._remote_sock)
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def on_local_error(self):
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self.destroy()
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def on_remote_error(self):
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self.destroy()
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def handle_event(self, sock, event):
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# order is important
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if sock == self._remote_sock:
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if event & eventloop.POLL_IN:
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self.on_remote_read()
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if event & eventloop.POLL_OUT:
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self.on_remote_write()
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if event & eventloop.POLL_ERR:
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self.on_remote_error()
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elif sock == self._local_sock:
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if event & eventloop.POLL_IN:
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self.on_local_read()
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if event & eventloop.POLL_OUT:
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self.on_local_write()
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if event & eventloop.POLL_ERR:
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self.on_local_error()
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else:
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logging.warn('unknown socket')
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def destroy(self):
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if self._remote_sock:
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self._remote_sock.close()
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self._loop.remove(self._remote_sock)
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del self._fd_to_handlers[self._remote_sock.fileno()]
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self._remote_sock = None
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if self._local_sock:
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self._local_sock.close()
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self._loop.remove(self._local_sock)
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del self._fd_to_handlers[self._local_sock.fileno()]
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self._local_sock = None
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class TCPRelay(object):
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def __init__(self, config, is_local):
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self._config = config
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self._is_local = is_local
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self._closed = False
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self._fd_to_handlers = {}
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if is_local:
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listen_addr = config['local_address']
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listen_port = config['local_port']
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else:
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listen_addr = config['server']
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listen_port = config['server_port']
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addrs = socket.getaddrinfo(listen_addr, listen_port, 0,
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socket.SOCK_STREAM, socket.SOL_TCP)
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if len(addrs) == 0:
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raise Exception("can't get addrinfo for %s:%d" %
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(listen_addr, listen_port))
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af, socktype, proto, canonname, sa = addrs[0]
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server_socket = socket.socket(af, socktype, proto)
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server_socket.bind(sa)
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server_socket.setblocking(False)
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server_socket.listen(1024)
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self._server_socket = server_socket
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def _run(self):
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server_socket = self._server_socket
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self._eventloop = eventloop.EventLoop()
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self._eventloop.add(server_socket, eventloop.POLL_IN)
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last_time = time.time()
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while not self._closed:
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try:
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events = self._eventloop.poll(1)
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except (OSError, IOError) as e:
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if eventloop.errno_from_exception(e) == errno.EPIPE:
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# Happens when the client closes the connection
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continue
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else:
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logging.error(e)
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continue
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for sock, event in events:
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if sock == self._server_socket:
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try:
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conn = self._server_socket.accept()
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TCPRelayHandler(self._eventloop, conn, self._config,
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self._is_local)
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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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continue
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else:
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handler = self._fd_to_handlers.get(sock.fileno(), None)
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if handler:
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handler.handle_event(sock, event)
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else:
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logging.warn('can not find handler for fd %d',
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sock.fileno())
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now = time.time()
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if now - last_time > 5:
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# TODO sweep timeouts
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last_time = now
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