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:
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 _on_remote_read(self):
# handle all remote read events
data = None
try:
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):
return
if not data:
self.destroy()
return
forbidden, type = common.forbidden_or_not(self._config,
self.r_dst_host, data)
if forbidden:
logging.info('Forbidden event -- proxy:{0}-- website:{1}'.format(
self._remote_sock.getpeername(), self.r_dst_host))
self.destroy(type='forbidden')
return
self._update_activity(len(data))
try:
self._write_to_sock(data, self._local_sock)
self._data_send = True
except Exception as e:
if self._config['verbose']:
traceback.print_exc()
# TODO use logging when debug completed
self.destroy()
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
remote_port = self._remote_address[1]
remote_sock = self._create_remote_socket(
remote_addr, remote_port)
try:
remote_sock.connect((remote_addr, remote_port))
except (OSError, IOError) as e:
if eventloop.errno_from_exception(e) == \
errno.EINPROGRESS:
pass
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)
return
except Exception as e:
if self._config['verbose']:
traceback.print_exc()
self.destroy()
def _on_local_read(self):
#
#logging.info('_on_local_read')
# 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
self._update_activity(len(data))
if not data:
return
if self._stage == STAGE_STREAM:
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 not is_local and self._stage == STAGE_INIT:
self._handle_stage_addr(data)
def _write_to_sock(self, data, sock):
# write data to sock
# if only some of the data are written, put remaining in the buffer
# and update the stream to wait for writing
if not data or not sock:
return False
uncomplete = False
try:
l = len(data)
s = sock.send(data)
if s < l:
data = data[s:]
uncomplete = True
except (OSError, IOError) as e:
error_no = eventloop.errno_from_exception(e)
if error_no in (errno.EAGAIN, errno.EINPROGRESS,
errno.EWOULDBLOCK):
uncomplete = True
else:
if self._config['verbose']:
traceback.print_exc()
self.destroy()
return False
if uncomplete:
if sock == self._local_sock:
self._data_to_write_to_local.append(data)
self._update_stream(STREAM_DOWN, WAIT_STATUS_WRITING)
elif sock == self._remote_sock:
self._data_to_write_to_remote.append(data)
self._update_stream(STREAM_UP, WAIT_STATUS_WRITING)
else:
logging.error('write_all_to_sock:unknown socket')
else:
if sock == self._local_sock:
self._update_stream(STREAM_DOWN, WAIT_STATUS_READING)
elif sock == self._remote_sock:
self._update_stream(STREAM_UP, WAIT_STATUS_READING)
else:
logging.error('write_all_to_sock:unknown socket')
return True