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#!/usr/bin/python
# -*- coding: utf-8 -*-
#
# Copyright 2015 clowwindy
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
from __future__ import absolute_import, division, print_function, \
with_statement
import time
import socket
import errno
import struct
import logging
import binascii
import traceback
import random
import platform
import threading
from shadowsocks import encrypt, obfs, eventloop, shell, common, lru_cache, version
from shadowsocks.common import pre_parse_header, parse_header
# we clear at most TIMEOUTS_CLEAN_SIZE timeouts each time
TIMEOUTS_CLEAN_SIZE = 512
MSG_FASTOPEN = 0x20000000
# SOCKS command definition
CMD_CONNECT = 1
CMD_BIND = 2
CMD_UDP_ASSOCIATE = 3
# for each opening port, we have a TCP Relay
# for each connection, we have a TCP Relay Handler to handle the connection
# for each handler, we have 2 sockets:
# local: connected to the client
# remote: connected to remote server
# for each handler, it could be at one of several stages:
# as sslocal:
# stage 0 SOCKS hello received from local, send hello to local
# stage 1 addr received from local, query DNS for remote
# stage 2 UDP assoc
# stage 3 DNS resolved, connect to remote
# stage 4 still connecting, more data from local received
# stage 5 remote connected, piping local and remote
# as ssserver:
# stage 0 just jump to stage 1
# stage 1 addr received from local, query DNS for remote
# stage 3 DNS resolved, connect to remote
# stage 4 still connecting, more data from local received
# stage 5 remote connected, piping local and remote
STAGE_INIT = 0
STAGE_ADDR = 1
STAGE_UDP_ASSOC = 2
STAGE_DNS = 3
STAGE_CONNECTING = 4
STAGE_STREAM = 5
STAGE_DESTROYED = -1
# for each handler, we have 2 stream directions:
# upstream: from client to server direction
# read local and write to remote
# downstream: from server to client direction
# read remote and write to local
STREAM_UP = 0
STREAM_DOWN = 1
# for each stream, it's waiting for reading, or writing, or both
WAIT_STATUS_INIT = 0
WAIT_STATUS_READING = 1
WAIT_STATUS_WRITING = 2
WAIT_STATUS_READWRITING = WAIT_STATUS_READING | WAIT_STATUS_WRITING
NETWORK_MTU = 1500
TCP_MSS = NETWORK_MTU - 40
BUF_SIZE = 32 * 1024
UDP_MAX_BUF_SIZE = 65536
class SpeedTester(object):
def __init__(self, max_speed = 0):
self.max_speed = max_speed * 1024
self.last_time = time.time()
self.sum_len = 0
def update_limit(self, max_speed):
self.max_speed = max_speed * 1024
def add(self, data_len):
if self.max_speed > 0:
cut_t = time.time()
self.sum_len -= (cut_t - self.last_time) * self.max_speed
if self.sum_len < 0:
self.sum_len = 0
self.last_time = cut_t
self.sum_len += data_len
def isExceed(self):
if self.max_speed > 0:
cut_t = time.time()
self.sum_len -= (cut_t - self.last_time) * self.max_speed
if self.sum_len < 0:
self.sum_len = 0
self.last_time = cut_t
return self.sum_len >= self.max_speed
return False
class TCPRelayHandler(object):
def __init__(self, server, fd_to_handlers, loop, local_sock, config,
dns_resolver, is_local):
self._server = server
self._fd_to_handlers = fd_to_handlers
self._loop = loop
self._local_sock = local_sock
self._remote_sock = None
self._remote_sock_v6 = None
self._local_sock_fd = None
self._remote_sock_fd = None
self._remotev6_sock_fd = None
self._remote_udp = False
self._config = config
self._dns_resolver = dns_resolver
self._add_ref = 0
if not self._create_encryptor(config):
return
self._client_address = local_sock.getpeername()[:2]
self._accept_address = local_sock.getsockname()[:2]
self._user = None
self._user_id = server._listen_port
self._update_tcp_mss(local_sock)
# TCP Relay works as either sslocal or ssserver
# if is_local, this is sslocal
self._is_local = is_local
self._encrypt_correct = True
self._obfs = obfs.obfs(config['obfs'])
self._protocol = obfs.obfs(config['protocol'])
self._overhead = self._obfs.get_overhead(self._is_local) + self._protocol.get_overhead(self._is_local)
self._recv_buffer_size = BUF_SIZE - self._overhead
server_info = obfs.server_info(server.obfs_data)
server_info.host = config['server']
server_info.port = server._listen_port
#server_info.users = server.server_users
#server_info.update_user_func = self._update_user
server_info.client = self._client_address[0]
server_info.client_port = self._client_address[1]
server_info.protocol_param = ''
server_info.obfs_param = config['obfs_param']
server_info.iv = self._encryptor.cipher_iv
server_info.recv_iv = b''
server_info.key_str = common.to_bytes(config['password'])
server_info.key = self._encryptor.cipher_key
server_info.head_len = 30
server_info.tcp_mss = self._tcp_mss
server_info.buffer_size = self._recv_buffer_size
server_info.overhead = self._overhead
self._obfs.set_server_info(server_info)
server_info = obfs.server_info(server.protocol_data)
server_info.host = config['server']
server_info.port = server._listen_port
server_info.users = server.server_users
server_info.update_user_func = self._update_user
server_info.client = self._client_address[0]
server_info.client_port = self._client_address[1]
server_info.protocol_param = config['protocol_param']
server_info.obfs_param = ''
server_info.iv = self._encryptor.cipher_iv
server_info.recv_iv = b''
server_info.key_str = common.to_bytes(config['password'])
server_info.key = self._encryptor.cipher_key
server_info.head_len = 30
server_info.tcp_mss = self._tcp_mss
server_info.buffer_size = self._recv_buffer_size
server_info.overhead = self._overhead
self._protocol.set_server_info(server_info)
self._redir_list = config.get('redirect', ["*#0.0.0.0:0"])
self._is_redirect = False
self._bind = config.get('out_bind', '')
self._bindv6 = config.get('out_bindv6', '')
self._ignore_bind_list = config.get('ignore_bind', [])
self._fastopen_connected = False
self._data_to_write_to_local = []
self._data_to_write_to_remote = []
self._udp_data_send_buffer = b''
self._upstream_status = WAIT_STATUS_READING
self._downstream_status = WAIT_STATUS_INIT
self._remote_address = None
self._forbidden_iplist = config.get('forbidden_ip', None)
self._forbidden_portset = config.get('forbidden_port', None)
if is_local:
self._chosen_server = self._get_a_server()
self.last_activity = 0
self._update_activity()
self._server.add_connection(1)
self._server.stat_add(self._client_address[0], 1)
self._add_ref = 1
self.speed_tester_u = SpeedTester(config.get("speed_limit_per_con", 0))
self.speed_tester_d = SpeedTester(config.get("speed_limit_per_con", 0))
self._recv_u_max_size = BUF_SIZE
self._recv_d_max_size = BUF_SIZE
self._recv_pack_id = 0
self._udp_send_pack_id = 0
self._udpv6_send_pack_id = 0
local_sock.setblocking(False)
local_sock.setsockopt(socket.SOL_TCP, socket.TCP_NODELAY, 1)
self._local_sock_fd = local_sock.fileno()
fd_to_handlers[self._local_sock_fd] = self
loop.add(local_sock, eventloop.POLL_IN | eventloop.POLL_ERR, self._server)
self._stage = STAGE_INIT
def __hash__(self):
# default __hash__ is id / 16
# we want to eliminate collisions
return id(self)
@property
def remote_address(self):
return self._remote_address
def _get_a_server(self):
server = self._config['server']
server_port = self._config['server_port']
if type(server_port) == list:
server_port = random.choice(server_port)
if type(server) == list:
server = random.choice(server)
logging.debug('chosen server: %s:%d', server, server_port)
return server, server_port
def _update_tcp_mss(self, local_sock):
self._tcp_mss = TCP_MSS
try:
tcp_mss = local_sock.getsockopt(socket.SOL_TCP, socket.TCP_MAXSEG)
if tcp_mss > 500 and tcp_mss <= 1500:
self._tcp_mss = tcp_mss
logging.debug("TCP MSS = %d" % (self._tcp_mss,))
except:
pass
def _create_encryptor(self, config):
try:
self._encryptor = encrypt.Encryptor(config['password'],
config['method'])
return True
except Exception:
self._stage = STAGE_DESTROYED
logging.error('create encryptor fail at port %d', self._server._listen_port)
def _update_user(self, user):
self._user = user
self._user_id = struct.unpack('<I', user)[0]
if self._user in self._server.server_users_cfg:
cfg = self._server.server_users_cfg[self._user]
speed = cfg.get('speed_limit_per_con', 0)
self.speed_tester_u.update_limit(speed)
self.speed_tester_d.update_limit(speed)
def _update_activity(self, data_len=0):
# tell the TCP Relay we have activities recently
# else it will think we are inactive and timed out
self._server.update_activity(self, data_len)
def _update_stream(self, stream, status):
# update a stream to a new waiting status
# check if status is changed
# only update if dirty
dirty = False
if stream == STREAM_DOWN:
if self._downstream_status != status:
self._downstream_status = status
dirty = True
elif stream == STREAM_UP:
if self._upstream_status != status:
self._upstream_status = status
dirty = True
if dirty:
if self._local_sock:
event = eventloop.POLL_ERR
if self._downstream_status & WAIT_STATUS_WRITING:
event |= eventloop.POLL_OUT
if self._upstream_status & WAIT_STATUS_READING:
event |= eventloop.POLL_IN
self._loop.modify(self._local_sock, event)
if self._remote_sock:
event = eventloop.POLL_ERR
if self._downstream_status & WAIT_STATUS_READING:
event |= eventloop.POLL_IN
if self._upstream_status & WAIT_STATUS_WRITING:
event |= eventloop.POLL_OUT
self._loop.modify(self._remote_sock, event)
if self._remote_sock_v6:
self._loop.modify(self._remote_sock_v6, event)
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 sock:
return False
uncomplete = False
if self._remote_udp and sock == self._remote_sock:
try:
self._udp_data_send_buffer += data
#logging.info('UDP over TCP sendto %d %s' % (len(data), binascii.hexlify(data)))
while len(self._udp_data_send_buffer) > 6:
length = struct.unpack('>H', self._udp_data_send_buffer[:2])[0]
if length > len(self._udp_data_send_buffer):
break
data = self._udp_data_send_buffer[:length]
self._udp_data_send_buffer = self._udp_data_send_buffer[length:]
frag = common.ord(data[2])
if frag != 0:
logging.warn('drop a message since frag is %d' % (frag,))
continue
else:
data = data[3:]
header_result = parse_header(data)
if header_result is None:
continue
connecttype, addrtype, dest_addr, dest_port, header_length = header_result
if (addrtype & 7) == 3:
af = common.is_ip(dest_addr)
if af == False:
handler = common.UDPAsyncDNSHandler(data[header_length:])
handler.resolve(self._dns_resolver, (dest_addr, dest_port), self._handle_server_dns_resolved)
else:
return self._handle_server_dns_resolved("", (dest_addr, dest_port), dest_addr, data[header_length:])
else:
return self._handle_server_dns_resolved("", (dest_addr, dest_port), dest_addr, data[header_length:])
except Exception as e:
#trace = traceback.format_exc()
#logging.error(trace)
error_no = eventloop.errno_from_exception(e)
if error_no in (errno.EAGAIN, errno.EINPROGRESS,
errno.EWOULDBLOCK):
uncomplete = True
else:
shell.print_exception(e)
logging.error("exception from %s:%d" % (self._client_address[0], self._client_address[1]))
self.destroy()
return False
return True
else:
try:
if self._encrypt_correct:
if sock == self._remote_sock:
self._server.add_transfer_u(self._user, len(data))
self._update_activity(len(data))
if data:
l = len(data)
s = sock.send(data)
if s < l:
data = data[s:]
uncomplete = True
else:
return
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:
#traceback.print_exc()
shell.print_exception(e)
logging.error("exception from %s:%d" % (self._client_address[0], self._client_address[1]))
self.destroy()
return False
except Exception as e:
shell.print_exception(e)
logging.error("exception from %s:%d" % (self._client_address[0], self._client_address[1]))
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 from %s:%d' % (self._client_address[0], self._client_address[1]))
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 from %s:%d' % (self._client_address[0], self._client_address[1]))
return True
def _handle_server_dns_resolved(self, error, remote_addr, server_addr, data):
if error:
return
try:
addrs = socket.getaddrinfo(server_addr, remote_addr[1], 0, socket.SOCK_DGRAM, socket.SOL_UDP)
if not addrs: # drop
return
af, socktype, proto, canonname, sa = addrs[0]
if af == socket.AF_INET6:
self._remote_sock_v6.sendto(data, (server_addr, remote_addr[1]))
if self._udpv6_send_pack_id == 0:
addr, port = self._remote_sock_v6.getsockname()[:2]
common.connect_log('UDPv6 sendto %s(%s):%d from %s:%d by user %d' %
(common.to_str(remote_addr[0]), common.to_str(server_addr), remote_addr[1], addr, port, self._user_id))
self._udpv6_send_pack_id += 1
else:
self._remote_sock.sendto(data, (server_addr, remote_addr[1]))
if self._udp_send_pack_id == 0:
addr, port = self._remote_sock.getsockname()[:2]
common.connect_log('UDP sendto %s(%s):%d from %s:%d by user %d' %
(common.to_str(remote_addr[0]), common.to_str(server_addr), remote_addr[1], addr, port, self._user_id))
self._udp_send_pack_id += 1
return True
except Exception as e:
shell.print_exception(e)
logging.error("exception from %s:%d" % (self._client_address[0], self._client_address[1]))
def _get_redirect_host(self, client_address, ogn_data):
host_list = self._redir_list or ["*#0.0.0.0:0"]
if type(host_list) != list:
host_list = [host_list]
items_sum = common.to_str(host_list[0]).rsplit('#', 1)
if len(items_sum) < 2:
hash_code = binascii.crc32(ogn_data)
addrs = socket.getaddrinfo(client_address[0], client_address[1], 0, socket.SOCK_STREAM, socket.SOL_TCP)
af, socktype, proto, canonname, sa = addrs[0]
address_bytes = common.inet_pton(af, sa[0])
if af == socket.AF_INET6:
addr = struct.unpack('>Q', address_bytes[8:])[0]
elif af == socket.AF_INET:
addr = struct.unpack('>I', address_bytes)[0]
else:
addr = 0
host_port = []
match_port = False
for host in host_list:
items = common.to_str(host).rsplit(':', 1)
if len(items) > 1:
try:
port = int(items[1])
if port == self._server._listen_port:
match_port = True
host_port.append((items[0], port))
except:
pass
else:
host_port.append((host, 80))
if match_port:
last_host_port = host_port
host_port = []
for host in last_host_port:
if host[1] == self._server._listen_port:
host_port.append(host)
return host_port[((hash_code & 0xffffffff) + addr) % len(host_port)]
else:
host_port = []
for host in host_list:
items_sum = common.to_str(host).rsplit('#', 1)
items_match = common.to_str(items_sum[0]).rsplit(':', 1)
items = common.to_str(items_sum[1]).rsplit(':', 1)
if len(items_match) > 1:
if items_match[1] != "*":
try:
if self._server._listen_port != int(items_match[1]) and int(items_match[1]) != 0:
continue
except:
pass
if items_match[0] != "*" and common.match_regex(
items_match[0], ogn_data) == False:
continue
if len(items) > 1:
try:
port = int(items[1])
return (items[0], port)
except:
pass
else:
return (items[0], 80)
return ("0.0.0.0", 0)
def _handel_protocol_error(self, client_address, ogn_data):
logging.warn("Protocol ERROR, TCP ogn data %s from %s:%d via port %d by UID %d" % (binascii.hexlify(ogn_data), client_address[0], client_address[1], self._server._listen_port, self._user_id))
self._encrypt_correct = False
#create redirect or disconnect by hash code
host, port = self._get_redirect_host(client_address, ogn_data)
if port == 0:
raise Exception('can not parse header')
data = b"\x03" + common.to_bytes(common.chr(len(host))) + common.to_bytes(host) + struct.pack('>H', port)
self._is_redirect = True
logging.warn("TCP data redir %s:%d %s" % (host, port, binascii.hexlify(data)))
return data + ogn_data
def _handle_stage_connecting(self, data):
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)
if data:
self._data_to_write_to_remote.append(data)
if self._is_local and not self._fastopen_connected and \
self._config['fast_open']:
# for sslocal and fastopen, we basically wait for data and use
# sendto to connect
try:
# only connect once
self._fastopen_connected = True
remote_sock = \
self._create_remote_socket(self._chosen_server[0],
self._chosen_server[1])
self._loop.add(remote_sock, eventloop.POLL_ERR, self._server)
data = b''.join(self._data_to_write_to_remote)
l = len(data)
s = remote_sock.sendto(data, MSG_FASTOPEN, self._chosen_server)
if s < l:
data = data[s:]
self._data_to_write_to_remote = [data]
else:
self._data_to_write_to_remote = []
self._update_stream(STREAM_UP, WAIT_STATUS_READWRITING)
except (OSError, IOError) as e:
if eventloop.errno_from_exception(e) == errno.EINPROGRESS:
# in this case data is not sent at all
self._update_stream(STREAM_UP, WAIT_STATUS_READWRITING)
elif eventloop.errno_from_exception(e) == errno.ENOTCONN:
logging.error('fast open not supported on this OS')
self._config['fast_open'] = False
self.destroy()
else:
shell.print_exception(e)
if self._config['verbose']:
traceback.print_exc()
logging.error("exception from %s:%d" % (self._client_address[0], self._client_address[1]))
self.destroy()
def _get_head_size(self, buf, def_value):
if len(buf) < 2:
return def_value
head_type = common.ord(buf[0]) & 0xF
if head_type == 1:
return 7
if head_type == 4:
return 19
if head_type == 3:
return 4 + common.ord(buf[1])
return def_value
def _handle_stage_addr(self, ogn_data, data):
try:
if self._is_local:
cmd = common.ord(data[1])
if cmd == CMD_UDP_ASSOCIATE:
logging.debug('UDP associate')
if self._local_sock.family == socket.AF_INET6:
header = b'\x05\x00\x00\x04'
else:
header = b'\x05\x00\x00\x01'
addr, port = self._local_sock.getsockname()[:2]
addr_to_send = socket.inet_pton(self._local_sock.family,
addr)
port_to_send = struct.pack('>H', port)
self._write_to_sock(header + addr_to_send + port_to_send,
self._local_sock)
self._stage = STAGE_UDP_ASSOC
# just wait for the client to disconnect
return
elif cmd == CMD_CONNECT:
# just trim VER CMD RSV
data = data[3:]
else:
logging.error('invalid command %d', cmd)
self.destroy()
return
before_parse_data = data
if self._is_local:
header_result = parse_header(data)
else:
data = pre_parse_header(data)
if data is None:
data = self._handel_protocol_error(self._client_address, ogn_data)
header_result = parse_header(data)
if header_result is not None:
try:
common.to_str(header_result[2])
except Exception as e:
header_result = None
if header_result is None:
data = self._handel_protocol_error(self._client_address, ogn_data)
header_result = parse_header(data)
self._overhead = self._obfs.get_overhead(self._is_local) + self._protocol.get_overhead(self._is_local)
self._recv_buffer_size = BUF_SIZE - self._overhead
server_info = self._obfs.get_server_info()
server_info.buffer_size = self._recv_buffer_size
server_info = self._protocol.get_server_info()
server_info.buffer_size = self._recv_buffer_size
connecttype, addrtype, remote_addr, remote_port, header_length = header_result
if connecttype != 0:
pass
#common.connect_log('UDP over TCP by user %d' %
# (self._user_id, ))
else:
common.connect_log('TCP request %s:%d by user %d' %
(common.to_str(remote_addr), remote_port, self._user_id))
self._remote_address = (common.to_str(remote_addr), remote_port)
self._remote_udp = (connecttype != 0)
# pause reading
self._update_stream(STREAM_UP, WAIT_STATUS_WRITING)
self._stage = STAGE_DNS
if self._is_local:
# forward address to remote
self._write_to_sock((b'\x05\x00\x00\x01'
b'\x00\x00\x00\x00\x10\x10'),
self._local_sock)
head_len = self._get_head_size(data, 30)
self._obfs.obfs.server_info.head_len = head_len
self._protocol.obfs.server_info.head_len = head_len
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 _socket_bind_addr(self, sock, af):
bind_addr = ''
if self._bind and af == socket.AF_INET:
bind_addr = self._bind
elif self._bindv6 and af == socket.AF_INET6:
bind_addr = self._bindv6
else:
bind_addr = self._accept_address[0]
bind_addr = bind_addr.replace("::ffff:", "")
if bind_addr in self._ignore_bind_list:
bind_addr = None
if bind_addr:
local_addrs = socket.getaddrinfo(bind_addr, 0, 0, socket.SOCK_STREAM, socket.SOL_TCP)
if local_addrs[0][0] == af:
logging.debug("bind %s" % (bind_addr,))
try:
sock.bind((bind_addr, 0))
except Exception as e:
logging.warn("bind %s fail" % (bind_addr,))
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 not self._remote_udp and not self._is_redirect:
if self._forbidden_iplist:
if common.to_str(sa[0]) in self._forbidden_iplist:
if self._remote_address:
raise Exception('IP %s is in forbidden list, when connect to %s:%d via port %d by UID %d' %
(common.to_str(sa[0]), self._remote_address[0], self._remote_address[1], self._server._listen_port, self._user_id))
raise Exception('IP %s is in forbidden list, reject' %
common.to_str(sa[0]))
if self._forbidden_portset:
if sa[1] in self._forbidden_portset:
if self._remote_address:
raise Exception('Port %d is in forbidden list, when connect to %s:%d via port %d by UID %d' %
(sa[1], self._remote_address[0], self._remote_address[1], self._server._listen_port, self._user_id))
raise Exception('Port %d is in forbidden list, reject' % sa[1])
remote_sock = socket.socket(af, socktype, proto)
self._remote_sock = remote_sock
self._remote_sock_fd = remote_sock.fileno()
self._fd_to_handlers[self._remote_sock_fd] = 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._remotev6_sock_fd = remote_sock_v6.fileno()
self._fd_to_handlers[self._remotev6_sock_fd] = self
remote_sock.setblocking(False)
if self._remote_udp:
remote_sock_v6.setblocking(False)
if not self._is_local:
self._socket_bind_addr(remote_sock, af)
self._socket_bind_addr(remote_sock_v6, af)
else:
remote_sock.setsockopt(socket.SOL_TCP, socket.TCP_NODELAY, 1)
if not self._is_local:
self._socket_bind_addr(remote_sock, af)
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
addr, port = self._remote_sock.getsockname()[:2]
common.connect_log('TCP connecting %s(%s):%d from %s:%d by user %d' %
(common.to_str(self._remote_address[0]), common.to_str(remote_addr), remote_port, addr, port, self._user_id))
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()
logging.error("exception from %s:%d" % (self._client_address[0], self._client_address[1]))
self.destroy()
def _get_read_size(self, sock, recv_buffer_size, up):
if self._overhead == 0:
return recv_buffer_size
buffer_size = len(sock.recv(recv_buffer_size, socket.MSG_PEEK))
if up:
buffer_size = min(buffer_size, self._recv_u_max_size)
self._recv_u_max_size = min(self._recv_u_max_size + self._tcp_mss - self._overhead, BUF_SIZE)
else:
buffer_size = min(buffer_size, self._recv_d_max_size)
self._recv_d_max_size = min(self._recv_d_max_size + self._tcp_mss - self._overhead, BUF_SIZE)
if buffer_size == recv_buffer_size:
return buffer_size
frame_size = self._tcp_mss - self._overhead
if buffer_size > frame_size:
buffer_size = int(buffer_size / frame_size) * frame_size
return buffer_size
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
if is_local:
recv_buffer_size = self._get_read_size(self._local_sock, self._recv_buffer_size, True)
else:
recv_buffer_size = BUF_SIZE
data = None
try:
data = self._local_sock.recv(recv_buffer_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.speed_tester_u.add(len(data))
self._server.speed_tester_u(self._user_id).add(len(data))
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)
logging.error("exception from %s:%d" % (self._client_address[0], self._client_address[1]))
self.destroy()
return
if obfs_decode[2]:
data = self._obfs.server_encode(b'')
try:
self._write_to_sock(data, self._local_sock)
except Exception as e:
shell.print_exception(e)
if self._config['verbose']:
traceback.print_exc()
logging.error("exception from %s:%d" % (self._client_address[0], self._client_address[1]))
self.destroy()
return
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, sendback = self._protocol.server_post_decrypt(data)
if sendback:
backdata = self._protocol.server_pre_encrypt(b'')
backdata = self._encryptor.encrypt(backdata)
backdata = self._obfs.server_encode(backdata)
try:
self._write_to_sock(backdata, self._local_sock)
except Exception as e:
shell.print_exception(e)
if self._config['verbose']:
traceback.print_exc()
logging.error("exception from %s:%d" % (self._client_address[0], self._client_address[1]))
self.destroy()
return
except Exception as e:
shell.print_exception(e)
logging.error("exception from %s:%d" % (self._client_address[0], self._client_address[1]))
self.destroy()
return
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)
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
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(UDP_MAX_BUF_SIZE)
else:
data, addr = self._remote_sock_v6.recvfrom(UDP_MAX_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
size = len(data) + 2
data = struct.pack('>H', size) + 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:
if self._is_local:
recv_buffer_size = BUF_SIZE
else:
recv_buffer_size = self._get_read_size(self._remote_sock, self._recv_buffer_size, False)
data = self._remote_sock.recv(recv_buffer_size)
self._recv_pack_id += 1
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
self.speed_tester_d.add(len(data))
self._server.speed_tester_d(self._user_id).add(len(data))
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)
logging.error("exception from %s:%d" % (self._client_address[0], self._client_address[1]))
self.destroy()
return
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)
if self._recv_pack_id == 1:
self._tcp_mss = self._protocol.get_server_info().tcp_mss
except Exception as e:
shell.print_exception(e)
logging.error("exception from %s:%d" % (self._client_address[0], self._client_address[1]))
self.destroy()
return
else:
if self._encrypt_correct:
data = self._protocol.server_pre_encrypt(data)
data = self._encryptor.encrypt(data)
data = self._obfs.server_encode(data)
self._server.add_transfer_d(self._user, len(data))
self._update_activity(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()
logging.error("exception from %s:%d" % (self._client_address[0], self._client_address[1]))
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):
if self._local_sock:
err = eventloop.get_sock_error(self._local_sock)
if err.errno not in [errno.ECONNRESET, errno.EPIPE]:
logging.error(err)
logging.error("local error, exception from %s:%d" % (self._client_address[0], self._client_address[1]))
self.destroy()
def _on_remote_error(self):
if self._remote_sock:
err = eventloop.get_sock_error(self._remote_sock)
if err.errno not in [errno.ECONNRESET]:
logging.error(err)
if self._remote_address:
logging.error("remote error, when connect to %s:%d" % (self._remote_address[0], self._remote_address[1]))
else:
logging.error("remote error, exception from %s:%d" % (self._client_address[0], self._client_address[1]))
self.destroy()
def handle_event(self, sock, fd, event):
# handle all events in this handler and dispatch them to methods
handle = False
if self._stage == STAGE_DESTROYED:
logging.debug('ignore handle_event: destroyed')
return True
if self._user is not None and self._user not in self._server.server_users:
self.destroy()
return True
if fd == self._remote_sock_fd or fd == self._remotev6_sock_fd:
if event & eventloop.POLL_ERR:
handle = True
self._on_remote_error()
elif event & (eventloop.POLL_IN | eventloop.POLL_HUP):
if not self.speed_tester_d.isExceed() and not self._server.speed_tester_d(self._user_id).isExceed():
handle = True
self._on_remote_read(sock == self._remote_sock)
else:
self._recv_d_max_size = self._tcp_mss - self._overhead
elif event & eventloop.POLL_OUT:
handle = True
self._on_remote_write()
elif fd == self._local_sock_fd:
if event & eventloop.POLL_ERR:
handle = True
self._on_local_error()
elif event & (eventloop.POLL_IN | eventloop.POLL_HUP):
if not self.speed_tester_u.isExceed() and not self._server.speed_tester_u(self._user_id).isExceed():
handle = True
self._on_local_read()
else:
self._recv_u_max_size = self._tcp_mss - self._overhead
elif event & eventloop.POLL_OUT:
handle = True
self._on_local_write()
else:
logging.warn('unknown socket from %s:%d' % (self._client_address[0], self._client_address[1]))
try:
self._loop.removefd(fd)
except Exception as e:
shell.print_exception(e)
try:
del self._fd_to_handlers[fd]
except Exception as e:
shell.print_exception(e)
sock.close()
return handle
def _log_error(self, e):
logging.error('%s when handling connection from %s:%d' %
(e, self._client_address[0], self._client_address[1]))
def stage(self):
return self._stage
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.removefd(self._remote_sock_fd)
except Exception as e:
shell.print_exception(e)
try:
if self._remote_sock_fd is not None:
del self._fd_to_handlers[self._remote_sock_fd]
except Exception as e:
shell.print_exception(e)
self._remote_sock.close()
self._remote_sock = None
if self._remote_sock_v6:
logging.debug('destroying remote_v6')
try:
self._loop.removefd(self._remotev6_sock_fd)
except Exception as e:
shell.print_exception(e)
try:
if self._remotev6_sock_fd is not None:
del self._fd_to_handlers[self._remotev6_sock_fd]
except Exception as e:
shell.print_exception(e)
self._remote_sock_v6.close()
self._remote_sock_v6 = None
if self._local_sock:
logging.debug('destroying local')
try:
self._loop.removefd(self._local_sock_fd)
except Exception as e:
shell.print_exception(e)
try:
if self._local_sock_fd is not None:
del self._fd_to_handlers[self._local_sock_fd]
except Exception as e:
shell.print_exception(e)
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)
if self._add_ref > 0:
self._server.add_connection(-1)
self._server.stat_add(self._client_address[0], -1)
class TCPRelay(object):
def __init__(self, config, dns_resolver, is_local, stat_callback=None, stat_counter=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_users = {}
self.server_users_cfg = {}
self.server_user_transfer_ul = {}
self.server_user_transfer_dl = {}
self.mu = False
self._speed_tester_u = {}
self._speed_tester_d = {}
self.server_connections = 0
self.protocol_data = obfs.obfs(config['protocol']).init_data()
self.obfs_data = obfs.obfs(config['obfs']).init_data()
if config.get('connect_verbose_info', 0) > 0:
common.connect_log = logging.info
self._timeout = config['timeout']
self._timeout_cache = lru_cache.LRUCache(timeout=self._timeout,
close_callback=self._close_tcp_client)
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
if common.to_str(config['protocol']) in obfs.mu_protocol():
self._update_users(None, None)
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(config.get('max_connect', 1024))
self._server_socket = server_socket
self._server_socket_fd = server_socket.fileno()
self._stat_counter = stat_counter
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, client):
if hash(client) in self._timeout_cache:
del self._timeout_cache[hash(client)]
def add_connection(self, val):
self.server_connections += val
logging.debug('server port %5d connections = %d' % (self._listen_port, self.server_connections,))
def get_ud(self):
return (self.server_transfer_ul, self.server_transfer_dl)
def get_users_ud(self):
return (self.server_user_transfer_ul.copy(), self.server_user_transfer_dl.copy())
def _update_users(self, protocol_param, acl):
if protocol_param is None:
protocol_param = self._config['protocol_param']
param = common.to_bytes(protocol_param).split(b'#')
if len(param) == 2:
self.mu = True
user_list = param[1].split(b',')
if user_list:
for user in user_list:
items = user.split(b':')
if len(items) == 2:
user_int_id = int(items[0])
uid = struct.pack('<I', user_int_id)
if acl is not None and user_int_id not in acl:
self.del_user(uid)
else:
passwd = items[1]
self.add_user(uid, {'password':passwd})
def _update_user(self, id, passwd):
uid = struct.pack('<I', id)
self.add_user(uid, passwd)
def update_users(self, users):
for uid in list(self.server_users.keys()):
id = struct.unpack('<I', uid)[0]
if id not in users:
self.del_user(uid)
for id in users:
uid = struct.pack('<I', id)
self.add_user(uid, users[id])
def add_user(self, uid, cfg): # user: binstr[4], passwd: str
passwd = cfg['password']
self.server_users[uid] = common.to_bytes(passwd)
self.server_users_cfg[uid] = cfg
speed = cfg.get("speed_limit_per_user", 0)
if uid in self._speed_tester_u:
self._speed_tester_u[uid].update_limit(speed)
else:
self._speed_tester_u[uid] = SpeedTester(speed)
if uid in self._speed_tester_d:
self._speed_tester_d[uid].update_limit(speed)
else:
self._speed_tester_d[uid] = SpeedTester(speed)
def del_user(self, uid):
if uid in self.server_users:
del self.server_users[uid]
if uid in self.server_users_cfg:
del self.server_users_cfg[uid]
def add_transfer_u(self, user, transfer):
if user is None:
self.server_transfer_ul += transfer
else:
if user not in self.server_user_transfer_ul:
self.server_user_transfer_ul[user] = 0
self.server_user_transfer_ul[user] += transfer + self.server_transfer_ul
self.server_transfer_ul = 0
def add_transfer_d(self, user, transfer):
if user is None:
self.server_transfer_dl += transfer
else:
if user not in self.server_user_transfer_dl:
self.server_user_transfer_dl[user] = 0
self.server_user_transfer_dl[user] += transfer + self.server_transfer_dl
self.server_transfer_dl = 0
def speed_tester_u(self, uid):
if uid not in self._speed_tester_u:
if self.mu: #TODO
self._speed_tester_u[uid] = SpeedTester(self._config.get("speed_limit_per_user", 0))
else:
self._speed_tester_u[uid] = SpeedTester(self._config.get("speed_limit_per_user", 0))
return self._speed_tester_u[uid]
def speed_tester_d(self, uid):
if uid not in self._speed_tester_d:
if self.mu: #TODO
self._speed_tester_d[uid] = SpeedTester(self._config.get("speed_limit_per_user", 0))
else:
self._speed_tester_d[uid] = SpeedTester(self._config.get("speed_limit_per_user", 0))
return self._speed_tester_d[uid]
def update_limit(self, uid, max_speed):
if uid in self._speed_tester_u:
self._speed_tester_u[uid].update_limit(max_speed)
if uid in self._speed_tester_d:
self._speed_tester_d[uid].update_limit(max_speed)
def update_stat(self, port, stat_dict, val):
newval = stat_dict.get(0, 0) + val
stat_dict[0] = newval
logging.debug('port %d connections %d' % (port, newval))
connections_step = 25
if newval >= stat_dict.get(-1, 0) + connections_step:
logging.info('port %d connections up to %d' % (port, newval))
stat_dict[-1] = stat_dict.get(-1, 0) + connections_step
elif newval <= stat_dict.get(-1, 0) - connections_step:
logging.info('port %d connections down to %d' % (port, newval))
stat_dict[-1] = stat_dict.get(-1, 0) - connections_step
def stat_add(self, local_addr, val):
if self._stat_counter is not None:
if self._listen_port not in self._stat_counter:
self._stat_counter[self._listen_port] = {}
newval = self._stat_counter[self._listen_port].get(local_addr, 0) + val
logging.debug('port %d addr %s connections %d' % (self._listen_port, local_addr, newval))
self._stat_counter[self._listen_port][local_addr] = newval
self.update_stat(self._listen_port, self._stat_counter[self._listen_port], val)
if newval <= 0:
if local_addr in self._stat_counter[self._listen_port]:
del self._stat_counter[self._listen_port][local_addr]
newval = self._stat_counter.get(0, 0) + val
self._stat_counter[0] = newval
logging.debug('Total connections %d' % newval)
connections_step = 50
if newval >= self._stat_counter.get(-1, 0) + connections_step:
logging.info('Total connections up to %d' % newval)
self._stat_counter[-1] = self._stat_counter.get(-1, 0) + connections_step
elif newval <= self._stat_counter.get(-1, 0) - connections_step:
logging.info('Total connections down to %d' % newval)
self._stat_counter[-1] = self._stat_counter.get(-1, 0) - connections_step
def update_activity(self, client, data_len):
if data_len and self._stat_callback:
self._stat_callback(self._listen_port, data_len)
self._timeout_cache[hash(client)] = client
def _sweep_timeout(self):
self._timeout_cache.sweep()
def _close_tcp_client(self, client):
if client.remote_address:
logging.debug('timed out: %s:%d' %
client.remote_address)
else:
logging.debug('timed out')
client.destroy()
def handle_event(self, sock, fd, event):
# handle events and dispatch to handlers
handle = False
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')
handler = None
handle = True
try:
logging.debug('accept')
conn = self._server_socket.accept()
handler = TCPRelayHandler(self, self._fd_to_handlers,
self._eventloop, conn[0], self._config,
self._dns_resolver, self._is_local)
if handler.stage() == STAGE_DESTROYED:
conn[0].close()
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()
if handler:
handler.destroy()
else:
if sock:
handler = self._fd_to_handlers.get(fd, None)
if handler:
handle = handler.handle_event(sock, fd, event)
else:
logging.warn('unknown fd')
handle = True
try:
self._eventloop.removefd(fd)
except Exception as e:
shell.print_exception(e)
sock.close()
else:
logging.warn('poll removed fd')
handle = True
if fd in self._fd_to_handlers:
try:
del self._fd_to_handlers[fd]
except Exception as e:
shell.print_exception(e)
return handle
def handle_periodic(self):
if self._closed:
if self._server_socket:
self._eventloop.removefd(self._server_socket_fd)
self._server_socket.close()
self._server_socket = None
logging.info('closed TCP port %d', self._listen_port)
for handler in list(self._fd_to_handlers.values()):
handler.destroy()
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.removefd(self._server_socket_fd)
self._server_socket.close()
for handler in list(self._fd_to_handlers.values()):
handler.destroy()
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