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696 lines
26 KiB
696 lines
26 KiB
#!/usr/bin/python
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# -*- coding: utf-8 -*-
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#
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# Copyright 2015 clowwindy
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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# SOCKS5 UDP Request
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# +----+------+------+----------+----------+----------+
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# |RSV | FRAG | ATYP | DST.ADDR | DST.PORT | DATA |
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# +----+------+------+----------+----------+----------+
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# | 2 | 1 | 1 | Variable | 2 | Variable |
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# +----+------+------+----------+----------+----------+
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# SOCKS5 UDP Response
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# +----+------+------+----------+----------+----------+
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# |RSV | FRAG | ATYP | DST.ADDR | DST.PORT | DATA |
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# +----+------+------+----------+----------+----------+
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# | 2 | 1 | 1 | Variable | 2 | Variable |
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# +----+------+------+----------+----------+----------+
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# shadowsocks UDP Request (before encrypted)
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# +------+----------+----------+----------+
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# | ATYP | DST.ADDR | DST.PORT | DATA |
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# +------+----------+----------+----------+
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# | 1 | Variable | 2 | Variable |
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# +------+----------+----------+----------+
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# shadowsocks UDP Response (before encrypted)
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# +------+----------+----------+----------+
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# | ATYP | DST.ADDR | DST.PORT | DATA |
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# +------+----------+----------+----------+
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# | 1 | Variable | 2 | Variable |
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# +------+----------+----------+----------+
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# shadowsocks UDP Request and Response (after encrypted)
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# +-------+--------------+
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# | IV | PAYLOAD |
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# +-------+--------------+
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# | Fixed | Variable |
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# +-------+--------------+
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# HOW TO NAME THINGS
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# ------------------
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# `dest` means destination server, which is from DST fields in the SOCKS5
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# request
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# `local` means local server of shadowsocks
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# `remote` means remote server of shadowsocks
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# `client` means UDP clients that connects to other servers
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# `server` means the UDP server that handles user requests
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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 logging
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import struct
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import errno
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import random
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import binascii
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import traceback
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import threading
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from shadowsocks import encrypt, obfs, eventloop, lru_cache, common, shell
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from shadowsocks.common import pre_parse_header, parse_header, pack_addr
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# for each handler, we have 2 stream directions:
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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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STREAM_UP = 0
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STREAM_DOWN = 1
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# for each stream, it's waiting for reading, or writing, or both
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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 = 65536
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DOUBLE_SEND_BEG_IDS = 16
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POST_MTU_MIN = 500
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POST_MTU_MAX = 1400
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SENDING_WINDOW_SIZE = 8192
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STAGE_INIT = 0
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STAGE_RSP_ID = 1
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STAGE_DNS = 2
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STAGE_CONNECTING = 3
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STAGE_STREAM = 4
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STAGE_DESTROYED = -1
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CMD_CONNECT = 0
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CMD_RSP_CONNECT = 1
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CMD_CONNECT_REMOTE = 2
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CMD_RSP_CONNECT_REMOTE = 3
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CMD_POST = 4
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CMD_SYN_STATUS = 5
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CMD_POST_64 = 6
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CMD_SYN_STATUS_64 = 7
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CMD_DISCONNECT = 8
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CMD_VER_STR = b"\x08"
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RSP_STATE_EMPTY = b""
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RSP_STATE_REJECT = b"\x00"
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RSP_STATE_CONNECTED = b"\x01"
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RSP_STATE_CONNECTEDREMOTE = b"\x02"
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RSP_STATE_ERROR = b"\x03"
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RSP_STATE_DISCONNECT = b"\x04"
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RSP_STATE_REDIRECT = b"\x05"
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def client_key(source_addr, server_af):
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# notice this is server af, not dest af
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return '%s:%s:%d' % (source_addr[0], source_addr[1], server_af)
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class UDPRelay(object):
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def __init__(self, config, dns_resolver, is_local, stat_callback=None, stat_counter=None):
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self._config = config
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if config.get('connect_verbose_info', 0) > 0:
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common.connect_log = logging.info
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if is_local:
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self._listen_addr = config['local_address']
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self._listen_port = config['local_port']
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self._remote_addr = config['server']
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self._remote_port = config['server_port']
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else:
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self._listen_addr = config['server']
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self._listen_port = config['server_port']
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self._remote_addr = None
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self._remote_port = None
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self._dns_resolver = dns_resolver
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self._password = common.to_bytes(config['password'])
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self._method = config['method']
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self._timeout = config['timeout']
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self._is_local = is_local
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self._udp_cache_size = config['udp_cache']
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self._cache = lru_cache.LRUCache(timeout=config['udp_timeout'],
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close_callback=self._close_client_pair)
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self._cache_dns_client = lru_cache.LRUCache(timeout=10,
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close_callback=self._close_client_pair)
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self._client_fd_to_server_addr = {}
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self._dns_cache = lru_cache.LRUCache(timeout=1800)
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self._eventloop = None
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self._closed = False
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self.server_transfer_ul = 0
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self.server_transfer_dl = 0
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self.server_users = {}
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self.server_user_transfer_ul = {}
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self.server_user_transfer_dl = {}
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if common.to_bytes(config['protocol']) in obfs.mu_protocol():
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self._update_users(None, None)
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self.protocol_data = obfs.obfs(config['protocol']).init_data()
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self._protocol = obfs.obfs(config['protocol'])
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server_info = obfs.server_info(self.protocol_data)
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server_info.host = self._listen_addr
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server_info.port = self._listen_port
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server_info.users = self.server_users
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server_info.protocol_param = config['protocol_param']
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server_info.obfs_param = ''
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server_info.iv = b''
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server_info.recv_iv = b''
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server_info.key_str = common.to_bytes(config['password'])
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server_info.key = encrypt.encrypt_key(self._password, self._method)
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server_info.head_len = 30
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server_info.tcp_mss = 1452
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server_info.buffer_size = BUF_SIZE
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server_info.overhead = 0
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self._protocol.set_server_info(server_info)
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self._sockets = set()
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self._fd_to_handlers = {}
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self._reqid_to_hd = {}
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self._data_to_write_to_server_socket = []
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self._timeout_cache = lru_cache.LRUCache(timeout=self._timeout,
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close_callback=self._close_tcp_client)
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self._bind = config.get('out_bind', '')
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self._bindv6 = config.get('out_bindv6', '')
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self._ignore_bind_list = config.get('ignore_bind', [])
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if 'forbidden_ip' in config:
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self._forbidden_iplist = config['forbidden_ip']
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else:
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self._forbidden_iplist = None
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if 'forbidden_port' in config:
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self._forbidden_portset = config['forbidden_port']
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else:
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self._forbidden_portset = None
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addrs = socket.getaddrinfo(self._listen_addr, self._listen_port, 0,
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socket.SOCK_DGRAM, socket.SOL_UDP)
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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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(self._listen_addr, self._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((self._listen_addr, self._listen_port))
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server_socket.setblocking(False)
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self._server_socket = server_socket
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self._stat_callback = stat_callback
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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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if type(server) == list:
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server = random.choice(server)
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logging.debug('chosen server: %s:%d', server, server_port)
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return server, server_port
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def get_ud(self):
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return (self.server_transfer_ul, self.server_transfer_dl)
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def get_users_ud(self):
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ret = (self.server_user_transfer_ul.copy(), self.server_user_transfer_dl.copy())
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return ret
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def _update_users(self, protocol_param, acl):
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if protocol_param is None:
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protocol_param = self._config['protocol_param']
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param = common.to_bytes(protocol_param).split(b'#')
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if len(param) == 2:
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user_list = param[1].split(b',')
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if user_list:
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for user in user_list:
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items = user.split(b':')
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if len(items) == 2:
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user_int_id = int(items[0])
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uid = struct.pack('<I', user_int_id)
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if acl is not None and user_int_id not in acl:
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self.del_user(uid)
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else:
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passwd = items[1]
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self.add_user(uid, passwd)
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def update_user(self, id, passwd):
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uid = struct.pack('<I', id)
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self.add_user(uid, passwd)
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def update_users(self, users):
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for uid in list(self.server_users.keys()):
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id = struct.unpack('<I', uid)[0]
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if id not in users:
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self.del_user(uid)
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for id in users:
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uid = struct.pack('<I', id)
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self.add_user(uid, users[id])
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def add_user(self, user, passwd): # user: binstr[4], passwd: str
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self.server_users[user] = common.to_bytes(passwd)
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def del_user(self, user):
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if user in self.server_users:
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del self.server_users[user]
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def add_transfer_u(self, user, transfer):
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if user is None:
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self.server_transfer_ul += transfer
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else:
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if user not in self.server_user_transfer_ul:
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self.server_user_transfer_ul[user] = 0
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self.server_user_transfer_ul[user] += transfer + self.server_transfer_ul
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self.server_transfer_ul = 0
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def add_transfer_d(self, user, transfer):
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if user is None:
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self.server_transfer_dl += transfer
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else:
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if user not in self.server_user_transfer_dl:
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self.server_user_transfer_dl[user] = 0
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self.server_user_transfer_dl[user] += transfer + self.server_transfer_dl
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self.server_transfer_dl = 0
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def _close_client_pair(self, client_pair):
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client, uid = client_pair
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self._close_client(client)
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def _close_client(self, client):
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if hasattr(client, 'close'):
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if not self._is_local:
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if client.fileno() in self._client_fd_to_server_addr:
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logging.debug('close_client: %s' %
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(self._client_fd_to_server_addr[client.fileno()],))
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else:
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client.info('close_client')
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self._sockets.remove(client.fileno())
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self._eventloop.remove(client)
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del self._client_fd_to_server_addr[client.fileno()]
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client.close()
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else:
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# just an address
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client.info('close_client pass %s' % client)
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pass
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def _pre_parse_udp_header(self, data):
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if data is None:
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return
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datatype = common.ord(data[0])
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if datatype == 0x8:
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if len(data) >= 8:
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crc = binascii.crc32(data) & 0xffffffff
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if crc != 0xffffffff:
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logging.warn('uncorrect CRC32, maybe wrong password or '
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'encryption method')
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return None
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cmd = common.ord(data[1])
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request_id = struct.unpack('>H', data[2:4])[0]
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data = data[4:-4]
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return (cmd, request_id, data)
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elif len(data) >= 6 and common.ord(data[1]) == 0x0:
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crc = binascii.crc32(data) & 0xffffffff
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if crc != 0xffffffff:
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logging.warn('uncorrect CRC32, maybe wrong password or '
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'encryption method')
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return None
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cmd = common.ord(data[1])
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data = data[2:-4]
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return (cmd, 0, data)
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else:
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logging.warn('header too short, maybe wrong password or '
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'encryption method')
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return None
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return data
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def _pack_rsp_data(self, cmd, request_id, data):
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_rand_data = b"123456789abcdefghijklmnopqrstuvwxyz" * 2
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reqid_str = struct.pack(">H", request_id)
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return b''.join([CMD_VER_STR, common.chr(cmd), reqid_str, data, _rand_data[:random.randint(0, len(_rand_data))], reqid_str])
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def _handel_protocol_error(self, client_address, ogn_data):
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#raise Exception('can not parse header')
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logging.warn("Protocol ERROR, UDP ogn data %s from %s:%d" % (binascii.hexlify(ogn_data), client_address[0], client_address[1]))
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def _socket_bind_addr(self, sock, af):
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bind_addr = ''
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if self._bind and af == socket.AF_INET:
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bind_addr = self._bind
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elif self._bindv6 and af == socket.AF_INET6:
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bind_addr = self._bindv6
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bind_addr = bind_addr.replace("::ffff:", "")
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if bind_addr in self._ignore_bind_list:
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bind_addr = None
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if bind_addr:
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local_addrs = socket.getaddrinfo(bind_addr, 0, 0, socket.SOCK_DGRAM, socket.SOL_UDP)
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if local_addrs[0][0] == af:
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logging.debug("bind %s" % (bind_addr,))
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try:
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sock.bind((bind_addr, 0))
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except Exception as e:
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logging.warn("bind %s fail" % (bind_addr,))
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def _handle_server(self):
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server = self._server_socket
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data, r_addr = server.recvfrom(BUF_SIZE)
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ogn_data = data
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if not data:
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logging.debug('UDP handle_server: data is empty')
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if self._stat_callback:
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self._stat_callback(self._listen_port, len(data))
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uid = None
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if self._is_local:
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frag = common.ord(data[2])
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if frag != 0:
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logging.warn('drop a message since frag is not 0')
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return
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else:
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data = data[3:]
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else:
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ref_iv = [0]
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data = encrypt.encrypt_all_iv(self._protocol.obfs.server_info.key, self._method, 0, data, ref_iv)
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# decrypt data
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if not data:
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logging.debug('UDP handle_server: data is empty after decrypt')
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return
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self._protocol.obfs.server_info.recv_iv = ref_iv[0]
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data, uid = self._protocol.server_udp_post_decrypt(data)
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#logging.info("UDP data %s" % (binascii.hexlify(data),))
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if not self._is_local:
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data = pre_parse_header(data)
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data = self._pre_parse_udp_header(data)
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if data is None:
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return
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if type(data) is tuple:
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return
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#return self._handle_tcp_over_udp(data, r_addr)
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try:
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header_result = parse_header(data)
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except:
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self._handel_protocol_error(r_addr, ogn_data)
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return
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if header_result is None:
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self._handel_protocol_error(r_addr, ogn_data)
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return
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connecttype, dest_addr, dest_port, header_length = header_result
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if self._is_local:
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connecttype = 3
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server_addr, server_port = self._get_a_server()
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else:
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server_addr, server_port = dest_addr, dest_port
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if (connecttype & 7) == 3:
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addrs = self._dns_cache.get(server_addr, None)
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if addrs is None:
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# TODO async getaddrinfo
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addrs = socket.getaddrinfo(server_addr, server_port, 0,
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socket.SOCK_DGRAM, socket.SOL_UDP)
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if not addrs:
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# drop
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return
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else:
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self._dns_cache[server_addr] = addrs
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else:
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addrs = socket.getaddrinfo(server_addr, server_port, 0,
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socket.SOCK_DGRAM, socket.SOL_UDP)
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if not addrs:
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# drop
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return
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af, socktype, proto, canonname, sa = addrs[0]
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key = client_key(r_addr, af)
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client_pair = self._cache.get(key, None)
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if client_pair is None:
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client_pair = self._cache_dns_client.get(key, None)
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if client_pair is None:
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if self._forbidden_iplist:
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if common.to_str(sa[0]) in self._forbidden_iplist:
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logging.debug('IP %s is in forbidden list, drop' %
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common.to_str(sa[0]))
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# drop
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return
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if self._forbidden_portset:
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if sa[1] in self._forbidden_portset:
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logging.debug('Port %d is in forbidden list, reject' %
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sa[1])
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# drop
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return
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client = socket.socket(af, socktype, proto)
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client_uid = uid
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client.setblocking(False)
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self._socket_bind_addr(client, af)
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is_dns = False
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if len(data) > 20 and data[11:19] == b"\x00\x01\x00\x00\x00\x00\x00\x00":
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is_dns = True
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else:
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pass
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#logging.info("unknown data %s" % (binascii.hexlify(data),))
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if sa[1] == 53 and is_dns: #DNS
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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:
|
|
#logging.info('UDP handle_server sendto %s:%d %d bytes' % (common.to_str(server_addr), server_port, len(data)))
|
|
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)
|
|
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)
|
|
|