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Python port of ShadowsocksR
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shadowsocksr/shadowsocks/udprelay.py

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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.
# SOCKS5 UDP Request
# +----+------+------+----------+----------+----------+
# |RSV | FRAG | ATYP | DST.ADDR | DST.PORT | DATA |
# +----+------+------+----------+----------+----------+
# | 2 | 1 | 1 | Variable | 2 | Variable |
# +----+------+------+----------+----------+----------+
# SOCKS5 UDP Response
# +----+------+------+----------+----------+----------+
# |RSV | FRAG | ATYP | DST.ADDR | DST.PORT | DATA |
# +----+------+------+----------+----------+----------+
# | 2 | 1 | 1 | Variable | 2 | Variable |
# +----+------+------+----------+----------+----------+
# shadowsocks UDP Request (before encrypted)
# +------+----------+----------+----------+
# | ATYP | DST.ADDR | DST.PORT | DATA |
# +------+----------+----------+----------+
# | 1 | Variable | 2 | Variable |
# +------+----------+----------+----------+
# shadowsocks UDP Response (before encrypted)
# +------+----------+----------+----------+
# | ATYP | DST.ADDR | DST.PORT | DATA |
# +------+----------+----------+----------+
# | 1 | Variable | 2 | Variable |
# +------+----------+----------+----------+
# shadowsocks UDP Request and Response (after encrypted)
# +-------+--------------+
# | IV | PAYLOAD |
# +-------+--------------+
# | Fixed | Variable |
# +-------+--------------+
# HOW TO NAME THINGS
# ------------------
# `dest` means destination server, which is from DST fields in the SOCKS5
# request
# `local` means local server of shadowsocks
# `remote` means remote server of shadowsocks
# `client` means UDP clients that connects to other servers
# `server` means the UDP server that handles user requests
from __future__ import absolute_import, division, print_function, \
with_statement
import time
import socket
import logging
import struct
import errno
import random
import binascii
import traceback
import threading
from shadowsocks import encrypt, obfs, eventloop, lru_cache, common, shell
from shadowsocks.common import pre_parse_header, parse_header, pack_addr
# 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
BUF_SIZE = 65536
DOUBLE_SEND_BEG_IDS = 16
POST_MTU_MIN = 500
POST_MTU_MAX = 1400
SENDING_WINDOW_SIZE = 8192
STAGE_INIT = 0
STAGE_RSP_ID = 1
STAGE_DNS = 2
STAGE_CONNECTING = 3
STAGE_STREAM = 4
STAGE_DESTROYED = -1
CMD_CONNECT = 0
CMD_RSP_CONNECT = 1
CMD_CONNECT_REMOTE = 2
CMD_RSP_CONNECT_REMOTE = 3
CMD_POST = 4
CMD_SYN_STATUS = 5
CMD_POST_64 = 6
CMD_SYN_STATUS_64 = 7
CMD_DISCONNECT = 8
CMD_VER_STR = b"\x08"
RSP_STATE_EMPTY = b""
RSP_STATE_REJECT = b"\x00"
RSP_STATE_CONNECTED = b"\x01"
RSP_STATE_CONNECTEDREMOTE = b"\x02"
RSP_STATE_ERROR = b"\x03"
RSP_STATE_DISCONNECT = b"\x04"
RSP_STATE_REDIRECT = b"\x05"
def client_key(source_addr, server_af):
# notice this is server af, not dest af
return '%s:%s:%d' % (source_addr[0], source_addr[1], server_af)
class UDPRelay(object):
def __init__(self, config, dns_resolver, is_local, stat_callback=None, stat_counter=None):
self._config = config
if config.get('connect_verbose_info', 0) > 0:
common.connect_log = logging.info
if is_local:
self._listen_addr = config['local_address']
self._listen_port = config['local_port']
self._remote_addr = config['server']
self._remote_port = config['server_port']
else:
self._listen_addr = config['server']
self._listen_port = config['server_port']
self._remote_addr = None
self._remote_port = None
self._dns_resolver = dns_resolver
self._password = common.to_bytes(config['password'])
self._method = config['method']
self._timeout = config['timeout']
self._is_local = is_local
self._udp_cache_size = config['udp_cache']
self._cache = lru_cache.LRUCache(timeout=config['udp_timeout'],
close_callback=self._close_client_pair)
self._cache_dns_client = lru_cache.LRUCache(timeout=10,
close_callback=self._close_client_pair)
self._client_fd_to_server_addr = {}
self._dns_cache = lru_cache.LRUCache(timeout=1800)
self._eventloop = None
self._closed = False
self.server_transfer_ul = 0
self.server_transfer_dl = 0
self.server_users = {}
self.server_user_transfer_ul = {}
self.server_user_transfer_dl = {}
if common.to_bytes(config['protocol']) in obfs.mu_protocol():
self._update_users(None, None)
self.protocol_data = obfs.obfs(config['protocol']).init_data()
self._protocol = obfs.obfs(config['protocol'])
server_info = obfs.server_info(self.protocol_data)
server_info.host = self._listen_addr
server_info.port = self._listen_port
server_info.users = self.server_users
server_info.protocol_param = config['protocol_param']
server_info.obfs_param = ''
server_info.iv = b''
server_info.recv_iv = b''
server_info.key_str = common.to_bytes(config['password'])
server_info.key = encrypt.encrypt_key(self._password, self._method)
server_info.head_len = 30
server_info.tcp_mss = 1452
server_info.buffer_size = BUF_SIZE
server_info.overhead = 0
self._protocol.set_server_info(server_info)
self._sockets = set()
self._fd_to_handlers = {}
self._reqid_to_hd = {}
self._data_to_write_to_server_socket = []
self._timeout_cache = lru_cache.LRUCache(timeout=self._timeout,
close_callback=self._close_tcp_client)
self._bind = config.get('out_bind', '')
self._bindv6 = config.get('out_bindv6', '')
self._ignore_bind_list = config.get('ignore_bind', [])
if 'forbidden_ip' in config:
self._forbidden_iplist = config['forbidden_ip']
else:
self._forbidden_iplist = None
if 'forbidden_port' in config:
self._forbidden_portset = config['forbidden_port']
else:
self._forbidden_portset = None
addrs = socket.getaddrinfo(self._listen_addr, self._listen_port, 0,
socket.SOCK_DGRAM, socket.SOL_UDP)
if len(addrs) == 0:
raise Exception("can't get addrinfo for %s:%d" %
(self._listen_addr, self._listen_port))
af, socktype, proto, canonname, sa = addrs[0]
server_socket = socket.socket(af, socktype, proto)
server_socket.bind((self._listen_addr, self._listen_port))
server_socket.setblocking(False)
self._server_socket = server_socket
self._stat_callback = stat_callback
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 get_ud(self):
return (self.server_transfer_ul, self.server_transfer_dl)
def get_users_ud(self):
ret = (self.server_user_transfer_ul.copy(), self.server_user_transfer_dl.copy())
return ret
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:
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, 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, user, passwd): # user: binstr[4], passwd: str
self.server_users[user] = common.to_bytes(passwd)
def del_user(self, user):
if user in self.server_users:
del self.server_users[user]
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 _close_client_pair(self, client_pair):
client, uid = client_pair
self._close_client(client)
def _close_client(self, client):
if hasattr(client, 'close'):
if not self._is_local:
if client.fileno() in self._client_fd_to_server_addr:
logging.debug('close_client: %s' %
(self._client_fd_to_server_addr[client.fileno()],))
else:
client.info('close_client')
self._sockets.remove(client.fileno())
self._eventloop.remove(client)
del self._client_fd_to_server_addr[client.fileno()]
client.close()
else:
# just an address
client.info('close_client pass %s' % client)
pass
def _handel_protocol_error(self, client_address, ogn_data):
#raise Exception('can not parse header')
logging.warn("Protocol ERROR, UDP ogn data %s from %s:%d" % (binascii.hexlify(ogn_data), client_address[0], client_address[1]))
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
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_DGRAM, socket.SOL_UDP)
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 _handle_server(self):
server = self._server_socket
data, r_addr = server.recvfrom(BUF_SIZE)
ogn_data = data
if not data:
logging.debug('UDP handle_server: data is empty')
if self._stat_callback:
self._stat_callback(self._listen_port, len(data))
uid = None
if self._is_local:
frag = common.ord(data[2])
if frag != 0:
logging.warn('drop a message since frag is not 0')
return
else:
data = data[3:]
else:
ref_iv = [0]
data = encrypt.encrypt_all_iv(self._protocol.obfs.server_info.key, self._method, 0, data, ref_iv)
# decrypt data
if not data:
logging.debug('UDP handle_server: data is empty after decrypt')
return
self._protocol.obfs.server_info.recv_iv = ref_iv[0]
data, uid = self._protocol.server_udp_post_decrypt(data)
#logging.info("UDP data %s" % (binascii.hexlify(data),))
if not self._is_local:
data = pre_parse_header(data)
if data is None:
return
try:
header_result = parse_header(data)
except:
self._handel_protocol_error(r_addr, ogn_data)
return
if header_result is None:
self._handel_protocol_error(r_addr, ogn_data)
return
connecttype, dest_addr, dest_port, header_length = header_result
if self._is_local:
connecttype = 3
server_addr, server_port = self._get_a_server()
else:
server_addr, server_port = dest_addr, dest_port
if (connecttype & 7) == 3:
addrs = self._dns_cache.get(server_addr, None)
if addrs is None:
# TODO async getaddrinfo
addrs = socket.getaddrinfo(server_addr, server_port, 0,
socket.SOCK_DGRAM, socket.SOL_UDP)
if not addrs:
# drop
return
else:
self._dns_cache[server_addr] = addrs
else:
addrs = socket.getaddrinfo(server_addr, server_port, 0,
socket.SOCK_DGRAM, socket.SOL_UDP)
if not addrs:
# drop
return
af, socktype, proto, canonname, sa = addrs[0]
key = client_key(r_addr, af)
client_pair = self._cache.get(key, None)
if client_pair is None:
client_pair = self._cache_dns_client.get(key, None)
if client_pair is None:
if self._forbidden_iplist:
if common.to_str(sa[0]) in self._forbidden_iplist:
logging.debug('IP %s is in forbidden list, drop' % common.to_str(sa[0]))
# drop
return
if self._forbidden_portset:
if sa[1] in self._forbidden_portset:
logging.debug('Port %d is in forbidden list, reject' % sa[1])
# drop
return
client = socket.socket(af, socktype, proto)
client_uid = uid
client.setblocking(False)
self._socket_bind_addr(client, af)
is_dns = False
if len(data) > 20 and data[11:19] == b"\x00\x01\x00\x00\x00\x00\x00\x00":
is_dns = True
else:
pass
if sa[1] == 53 and is_dns: #DNS
logging.debug("DNS query %s from %s:%d" % (common.to_str(sa[0]), r_addr[0], r_addr[1]))
self._cache_dns_client[key] = (client, uid)
else:
self._cache[key] = (client, uid)
self._client_fd_to_server_addr[client.fileno()] = (r_addr, af)
self._sockets.add(client.fileno())
self._eventloop.add(client, eventloop.POLL_IN, self)
logging.debug('UDP port %5d sockets %d' % (self._listen_port, len(self._sockets)))
if uid is None:
user_id = self._listen_port
else:
user_id = struct.unpack('<I', client_uid)[0]
else:
client, client_uid = client_pair
self._cache.clear(self._udp_cache_size)
self._cache_dns_client.clear(16)
if self._is_local:
ref_iv = [encrypt.encrypt_new_iv(self._method)]
self._protocol.obfs.server_info.iv = ref_iv[0]
data = self._protocol.client_udp_pre_encrypt(data)
#logging.debug("%s" % (binascii.hexlify(data),))
data = encrypt.encrypt_all_iv(self._protocol.obfs.server_info.key, self._method, 1, data, ref_iv)
if not data:
return
else:
data = data[header_length:]
if not data:
return
try:
client.sendto(data, (server_addr, server_port))
self.add_transfer_u(client_uid, len(data))
if client_pair is None: # new request
addr, port = client.getsockname()[:2]
common.connect_log('UDP data to %s:%d from %s:%d by UID %d' %
(common.to_str(server_addr), server_port, addr, port, user_id))
except IOError as e:
err = eventloop.errno_from_exception(e)
logging.warning('IOError sendto %s:%d by user %d' % (server_addr, server_port, user_id))
if err in (errno.EINPROGRESS, errno.EAGAIN):
pass
else:
shell.print_exception(e)
def _handle_client(self, sock):
data, r_addr = sock.recvfrom(BUF_SIZE)
if not data:
logging.debug('UDP handle_client: data is empty')
return
if self._stat_callback:
self._stat_callback(self._listen_port, len(data))
client_addr = self._client_fd_to_server_addr.get(sock.fileno())
client_uid = None
if client_addr:
key = client_key(client_addr[0], client_addr[1])
client_pair = self._cache.get(key, None)
client_dns_pair = self._cache_dns_client.get(key, None)
if client_pair:
client, client_uid = client_pair
elif client_dns_pair:
client, client_uid = client_dns_pair
if not self._is_local:
addrlen = len(r_addr[0])
if addrlen > 255:
# drop
return
data = pack_addr(r_addr[0]) + struct.pack('>H', r_addr[1]) + data
ref_iv = [encrypt.encrypt_new_iv(self._method)]
self._protocol.obfs.server_info.iv = ref_iv[0]
data = self._protocol.server_udp_pre_encrypt(data, client_uid)
response = encrypt.encrypt_all_iv(self._protocol.obfs.server_info.key, self._method, 1,
data, ref_iv)
if not response:
return
else:
ref_iv = [0]
data = encrypt.encrypt_all_iv(self._protocol.obfs.server_info.key, self._method, 0,
data, ref_iv)
if not data:
return
self._protocol.obfs.server_info.recv_iv = ref_iv[0]
data = self._protocol.client_udp_post_decrypt(data)
header_result = parse_header(data)
if header_result is None:
return
#connecttype, dest_addr, dest_port, header_length = header_result
#logging.debug('UDP handle_client %s:%d to %s:%d' % (common.to_str(r_addr[0]), r_addr[1], dest_addr, dest_port))
response = b'\x00\x00\x00' + data
if client_addr:
if client_uid:
self.add_transfer_d(client_uid, len(response))
else:
self.server_transfer_dl += len(response)
self.write_to_server_socket(response, client_addr[0])
if client_dns_pair:
logging.debug("remove dns client %s:%d" % (client_addr[0][0], client_addr[0][1]))
del self._cache_dns_client[key]
self._close_client(client_dns_pair[0])
else:
# this packet is from somewhere else we know
# simply drop that packet
pass
def write_to_server_socket(self, data, addr):
uncomplete = False
retry = 0
try:
self._server_socket.sendto(data, addr)
data = None
while self._data_to_write_to_server_socket:
data_buf = self._data_to_write_to_server_socket[0]
retry = data_buf[1] + 1
del self._data_to_write_to_server_socket[0]
data, addr = data_buf[0]
self._server_socket.sendto(data, addr)
except (OSError, IOError) as e:
error_no = eventloop.errno_from_exception(e)
uncomplete = True
if error_no in (errno.EWOULDBLOCK,):
pass
else:
shell.print_exception(e)
return False
#if uncomplete and data is not None and retry < 3:
# self._data_to_write_to_server_socket.append([(data, addr), retry])
#'''
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
server_socket = self._server_socket
self._eventloop.add(server_socket,
eventloop.POLL_IN | eventloop.POLL_ERR, self)
loop.add_periodic(self.handle_periodic)
def remove_handler(self, client):
if hash(client) in self._timeout_cache:
del self._timeout_cache[hash(client)]
def update_activity(self, client):
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()
client.destroy_local()
def handle_event(self, sock, fd, event):
if sock == self._server_socket:
if event & eventloop.POLL_ERR:
logging.error('UDP server_socket err')
try:
self._handle_server()
except Exception as e:
shell.print_exception(e)
if self._config['verbose']:
traceback.print_exc()
elif sock and (fd in self._sockets):
if event & eventloop.POLL_ERR:
logging.error('UDP client_socket err')
try:
self._handle_client(sock)
except Exception as e:
shell.print_exception(e)
if self._config['verbose']:
traceback.print_exc()
else:
if sock:
handler = self._fd_to_handlers.get(fd, None)
if handler:
handler.handle_event(sock, event)
else:
logging.warn('poll removed fd')
def handle_periodic(self):
if self._closed:
self._cache.clear(0)
self._cache_dns_client.clear(0)
self._dns_cache.sweep()
if self._eventloop:
self._eventloop.remove_periodic(self.handle_periodic)
self._eventloop.remove(self._server_socket)
if self._server_socket:
self._server_socket.close()
self._server_socket = None
logging.info('closed UDP port %d', self._listen_port)
else:
before_sweep_size = len(self._sockets)
self._cache.sweep()
self._cache_dns_client.sweep()
self._dns_cache.sweep()
if before_sweep_size != len(self._sockets):
logging.debug('UDP port %5d sockets %d' % (self._listen_port, len(self._sockets)))
self._sweep_timeout()
def close(self, next_tick=False):
logging.debug('UDP close')
self._closed = True
if not next_tick:
if self._eventloop:
self._eventloop.remove_periodic(self.handle_periodic)
self._eventloop.remove(self._server_socket)
self._server_socket.close()
self._cache.clear(0)
self._cache_dns_client.clear(0)