Refactor (#615)
* make tcprelay.py less nested * import traceback module at the top * make loops in DNSResolver less nested * make manager.py less nested * introduce exception_handle decorator make try/except block more clean * apply exception_handle decorator to tcprelay * quote condition judgement * pep8 fix
This commit is contained in:
ahxxm
mengskysama
parent
5c11527e1b
commit
5cd9f04948
6 changed files with 248 additions and 203 deletions
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@ -276,15 +276,18 @@ class DNSResolver(object):
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content = f.readlines()
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for line in content:
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line = line.strip()
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if line:
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if line.startswith(b'nameserver'):
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parts = line.split()
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if len(parts) >= 2:
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server = parts[1]
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if common.is_ip(server) == socket.AF_INET:
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if type(server) != str:
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server = server.decode('utf8')
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self._servers.append(server)
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if not (line and line.startswith(b'nameserver')):
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continue
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parts = line.split()
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if len(parts) < 2:
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continue
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server = parts[1]
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if common.is_ip(server) == socket.AF_INET:
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if type(server) != str:
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server = server.decode('utf8')
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self._servers.append(server)
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except IOError:
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pass
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if not self._servers:
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@ -299,13 +302,17 @@ class DNSResolver(object):
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for line in f.readlines():
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line = line.strip()
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parts = line.split()
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if len(parts) >= 2:
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ip = parts[0]
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if common.is_ip(ip):
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for i in range(1, len(parts)):
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hostname = parts[i]
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if hostname:
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self._hosts[hostname] = ip
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if len(parts) < 2:
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continue
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ip = parts[0]
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if not common.is_ip(ip):
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continue
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for i in range(1, len(parts)):
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hostname = parts[i]
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if hostname:
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self._hosts[hostname] = ip
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except IOError:
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self._hosts['localhost'] = '127.0.0.1'
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@ -25,6 +25,7 @@ import os
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import time
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import socket
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import select
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import traceback
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import errno
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import logging
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from collections import defaultdict
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@ -204,7 +205,6 @@ class EventLoop(object):
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logging.debug('poll:%s', e)
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else:
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logging.error('poll:%s', e)
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import traceback
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traceback.print_exc()
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continue
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@ -27,6 +27,7 @@ sys.path.insert(0, os.path.join(os.path.dirname(__file__), '../'))
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from shadowsocks import shell, daemon, eventloop, tcprelay, udprelay, asyncdns
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@shell.exception_handle(self_=False, exit_code=1)
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def main():
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shell.check_python()
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@ -37,36 +38,31 @@ def main():
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os.chdir(p)
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config = shell.get_config(True)
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daemon.daemon_exec(config)
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try:
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logging.info("starting local at %s:%d" %
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(config['local_address'], config['local_port']))
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logging.info("starting local at %s:%d" %
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(config['local_address'], config['local_port']))
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dns_resolver = asyncdns.DNSResolver()
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tcp_server = tcprelay.TCPRelay(config, dns_resolver, True)
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udp_server = udprelay.UDPRelay(config, dns_resolver, True)
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loop = eventloop.EventLoop()
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dns_resolver.add_to_loop(loop)
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tcp_server.add_to_loop(loop)
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udp_server.add_to_loop(loop)
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dns_resolver = asyncdns.DNSResolver()
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tcp_server = tcprelay.TCPRelay(config, dns_resolver, True)
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udp_server = udprelay.UDPRelay(config, dns_resolver, True)
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loop = eventloop.EventLoop()
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dns_resolver.add_to_loop(loop)
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tcp_server.add_to_loop(loop)
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udp_server.add_to_loop(loop)
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def handler(signum, _):
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logging.warn('received SIGQUIT, doing graceful shutting down..')
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tcp_server.close(next_tick=True)
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udp_server.close(next_tick=True)
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signal.signal(getattr(signal, 'SIGQUIT', signal.SIGTERM), handler)
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def handler(signum, _):
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logging.warn('received SIGQUIT, doing graceful shutting down..')
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tcp_server.close(next_tick=True)
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udp_server.close(next_tick=True)
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signal.signal(getattr(signal, 'SIGQUIT', signal.SIGTERM), handler)
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def int_handler(signum, _):
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sys.exit(1)
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signal.signal(signal.SIGINT, int_handler)
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daemon.set_user(config.get('user', None))
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loop.run()
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except Exception as e:
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shell.print_exception(e)
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def int_handler(signum, _):
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sys.exit(1)
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signal.signal(signal.SIGINT, int_handler)
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daemon.set_user(config.get('user', None))
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loop.run()
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if __name__ == '__main__':
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main()
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@ -173,18 +173,20 @@ class Manager(object):
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self._statistics.clear()
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def _send_control_data(self, data):
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if self._control_client_addr:
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try:
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self._control_socket.sendto(data, self._control_client_addr)
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except (socket.error, OSError, IOError) as e:
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error_no = eventloop.errno_from_exception(e)
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if error_no in (errno.EAGAIN, errno.EINPROGRESS,
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errno.EWOULDBLOCK):
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return
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else:
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shell.print_exception(e)
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if self._config['verbose']:
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traceback.print_exc()
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if not self._control_client_addr:
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return
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try:
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self._control_socket.sendto(data, self._control_client_addr)
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except (socket.error, OSError, IOError) as e:
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error_no = eventloop.errno_from_exception(e)
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if error_no in (errno.EAGAIN, errno.EINPROGRESS,
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errno.EWOULDBLOCK):
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return
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else:
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shell.print_exception(e)
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if self._config['verbose']:
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traceback.print_exc()
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def run(self):
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self._loop.run()
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@ -23,6 +23,10 @@ import json
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import sys
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import getopt
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import logging
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import traceback
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from functools import wraps
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from shadowsocks.common import to_bytes, to_str, IPNetwork
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from shadowsocks import encrypt
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@ -53,6 +57,49 @@ def print_exception(e):
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traceback.print_exc()
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def exception_handle(self_, err_msg=None, exit_code=None,
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destroy=False, conn_err=False):
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# self_: if function passes self as first arg
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def process_exception(e, self=None):
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print_exception(e)
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if err_msg:
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logging.error(err_msg)
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if exit_code:
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sys.exit(1)
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if not self_:
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return
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if conn_err:
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addr, port = self._client_address[0], self._client_address[1]
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logging.error('%s when handling connection from %s:%d' %
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(e, addr, port))
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if self._config['verbose']:
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traceback.print_exc()
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if destroy:
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self.destroy()
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def decorator(func):
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if self_:
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@wraps(func)
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def wrapper(self, *args, **kwargs):
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try:
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func(self, *args, **kwargs)
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except Exception as e:
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process_exception(e, self)
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else:
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@wraps(func)
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def wrapper(*args, **kwargs):
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try:
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func(*args, **kwargs)
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except Exception as e:
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process_exception(e)
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return wrapper
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return decorator
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def print_shadowsocks():
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version = ''
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try:
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@ -190,21 +190,23 @@ class TCPRelayHandler(object):
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if self._upstream_status != status:
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self._upstream_status = status
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dirty = True
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if dirty:
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if self._local_sock:
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event = eventloop.POLL_ERR
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if self._downstream_status & WAIT_STATUS_WRITING:
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event |= eventloop.POLL_OUT
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if self._upstream_status & WAIT_STATUS_READING:
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event |= eventloop.POLL_IN
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self._loop.modify(self._local_sock, event)
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if self._remote_sock:
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event = eventloop.POLL_ERR
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if self._downstream_status & WAIT_STATUS_READING:
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event |= eventloop.POLL_IN
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if self._upstream_status & WAIT_STATUS_WRITING:
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event |= eventloop.POLL_OUT
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self._loop.modify(self._remote_sock, event)
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if not dirty:
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return
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if self._local_sock:
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event = eventloop.POLL_ERR
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if self._downstream_status & WAIT_STATUS_WRITING:
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event |= eventloop.POLL_OUT
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if self._upstream_status & WAIT_STATUS_READING:
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event |= eventloop.POLL_IN
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self._loop.modify(self._local_sock, event)
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if self._remote_sock:
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event = eventloop.POLL_ERR
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if self._downstream_status & WAIT_STATUS_READING:
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event |= eventloop.POLL_IN
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if self._upstream_status & WAIT_STATUS_WRITING:
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event |= eventloop.POLL_OUT
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self._loop.modify(self._remote_sock, event)
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def _write_to_sock(self, data, sock):
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# write data to sock
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@ -247,19 +249,20 @@ class TCPRelayHandler(object):
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return True
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def _handle_stage_connecting(self, data):
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if self._is_local:
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if self._ota_enable_session:
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data = self._ota_chunk_data_gen(data)
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data = self._encryptor.encrypt(data)
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self._data_to_write_to_remote.append(data)
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else:
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if not self._is_local:
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if self._ota_enable_session:
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self._ota_chunk_data(data,
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self._data_to_write_to_remote.append)
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else:
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self._data_to_write_to_remote.append(data)
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if self._is_local and not self._fastopen_connected and \
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self._config['fast_open']:
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return
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if self._ota_enable_session:
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data = self._ota_chunk_data_gen(data)
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data = self._encryptor.encrypt(data)
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self._data_to_write_to_remote.append(data)
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if self._config['fast_open'] and not self._fastopen_connected:
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# for sslocal and fastopen, we basically wait for data and use
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# sendto to connect
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try:
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@ -293,93 +296,88 @@ class TCPRelayHandler(object):
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traceback.print_exc()
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self.destroy()
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@shell.exception_handle(self_=True, destroy=True, conn_err=True)
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def _handle_stage_addr(self, data):
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try:
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if self._is_local:
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cmd = common.ord(data[1])
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if cmd == CMD_UDP_ASSOCIATE:
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logging.debug('UDP associate')
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if self._local_sock.family == socket.AF_INET6:
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header = b'\x05\x00\x00\x04'
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else:
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header = b'\x05\x00\x00\x01'
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addr, port = self._local_sock.getsockname()[:2]
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addr_to_send = socket.inet_pton(self._local_sock.family,
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addr)
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port_to_send = struct.pack('>H', port)
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self._write_to_sock(header + addr_to_send + port_to_send,
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self._local_sock)
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self._stage = STAGE_UDP_ASSOC
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# just wait for the client to disconnect
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return
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elif cmd == CMD_CONNECT:
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# just trim VER CMD RSV
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data = data[3:]
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if self._is_local:
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cmd = common.ord(data[1])
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if cmd == CMD_UDP_ASSOCIATE:
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logging.debug('UDP associate')
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if self._local_sock.family == socket.AF_INET6:
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header = b'\x05\x00\x00\x04'
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else:
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logging.error('unknown command %d', cmd)
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header = b'\x05\x00\x00\x01'
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addr, port = self._local_sock.getsockname()[:2]
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addr_to_send = socket.inet_pton(self._local_sock.family,
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addr)
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port_to_send = struct.pack('>H', port)
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self._write_to_sock(header + addr_to_send + port_to_send,
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self._local_sock)
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self._stage = STAGE_UDP_ASSOC
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# just wait for the client to disconnect
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return
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elif cmd == CMD_CONNECT:
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# just trim VER CMD RSV
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data = data[3:]
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else:
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logging.error('unknown command %d', cmd)
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self.destroy()
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return
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header_result = parse_header(data)
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if header_result is None:
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raise Exception('can not parse header')
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addrtype, remote_addr, remote_port, header_length = header_result
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logging.info('connecting %s:%d from %s:%d' %
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(common.to_str(remote_addr), remote_port,
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self._client_address[0], self._client_address[1]))
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if self._is_local is False:
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# spec https://shadowsocks.org/en/spec/one-time-auth.html
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self._ota_enable_session = addrtype & ADDRTYPE_AUTH
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if self._ota_enable and not self._ota_enable_session:
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logging.warn('client one time auth is required')
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return
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if self._ota_enable_session:
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if len(data) < header_length + ONETIMEAUTH_BYTES:
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logging.warn('one time auth header is too short')
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return None
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offset = header_length + ONETIMEAUTH_BYTES
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_hash = data[header_length: offset]
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_data = data[:header_length]
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key = self._encryptor.decipher_iv + self._encryptor.key
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if onetimeauth_verify(_hash, _data, key) is False:
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logging.warn('one time auth fail')
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self.destroy()
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return
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header_result = parse_header(data)
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if header_result is None:
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raise Exception('can not parse header')
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addrtype, remote_addr, remote_port, header_length = header_result
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logging.info('connecting %s:%d from %s:%d' %
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(common.to_str(remote_addr), remote_port,
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self._client_address[0], self._client_address[1]))
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if self._is_local is False:
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# spec https://shadowsocks.org/en/spec/one-time-auth.html
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self._ota_enable_session = addrtype & ADDRTYPE_AUTH
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if self._ota_enable and not self._ota_enable_session:
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logging.warn('client one time auth is required')
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return
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if self._ota_enable_session:
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if len(data) < header_length + ONETIMEAUTH_BYTES:
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logging.warn('one time auth header is too short')
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return None
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offset = header_length + ONETIMEAUTH_BYTES
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_hash = data[header_length: offset]
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_data = data[:header_length]
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key = self._encryptor.decipher_iv + self._encryptor.key
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if onetimeauth_verify(_hash, _data, key) is False:
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logging.warn('one time auth fail')
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self.destroy()
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return
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header_length += ONETIMEAUTH_BYTES
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self._remote_address = (common.to_str(remote_addr), remote_port)
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# pause reading
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self._update_stream(STREAM_UP, WAIT_STATUS_WRITING)
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self._stage = STAGE_DNS
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if self._is_local:
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# forward address to remote
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self._write_to_sock((b'\x05\x00\x00\x01'
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b'\x00\x00\x00\x00\x10\x10'),
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self._local_sock)
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# spec https://shadowsocks.org/en/spec/one-time-auth.html
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# ATYP & 0x10 == 1, then OTA is enabled.
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if self._ota_enable_session:
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data = common.chr(addrtype | ADDRTYPE_AUTH) + data[1:]
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key = self._encryptor.cipher_iv + self._encryptor.key
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data += onetimeauth_gen(data, key)
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data_to_send = self._encryptor.encrypt(data)
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self._data_to_write_to_remote.append(data_to_send)
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# notice here may go into _handle_dns_resolved directly
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self._dns_resolver.resolve(self._chosen_server[0],
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self._handle_dns_resolved)
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else:
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if self._ota_enable_session:
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data = data[header_length:]
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self._ota_chunk_data(data,
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self._data_to_write_to_remote.append)
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elif len(data) > header_length:
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self._data_to_write_to_remote.append(data[header_length:])
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# notice here may go into _handle_dns_resolved directly
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self._dns_resolver.resolve(remote_addr,
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self._handle_dns_resolved)
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except Exception as e:
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self._log_error(e)
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if self._config['verbose']:
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traceback.print_exc()
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self.destroy()
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header_length += ONETIMEAUTH_BYTES
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self._remote_address = (common.to_str(remote_addr), remote_port)
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# pause reading
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self._update_stream(STREAM_UP, WAIT_STATUS_WRITING)
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self._stage = STAGE_DNS
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if self._is_local:
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# forward address to remote
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self._write_to_sock((b'\x05\x00\x00\x01'
|
||||
b'\x00\x00\x00\x00\x10\x10'),
|
||||
self._local_sock)
|
||||
# spec https://shadowsocks.org/en/spec/one-time-auth.html
|
||||
# ATYP & 0x10 == 1, then OTA is enabled.
|
||||
if self._ota_enable_session:
|
||||
data = common.chr(addrtype | ADDRTYPE_AUTH) + data[1:]
|
||||
key = self._encryptor.cipher_iv + self._encryptor.key
|
||||
data += onetimeauth_gen(data, key)
|
||||
data_to_send = self._encryptor.encrypt(data)
|
||||
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 self._ota_enable_session:
|
||||
data = data[header_length:]
|
||||
self._ota_chunk_data(data,
|
||||
self._data_to_write_to_remote.append)
|
||||
elif 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)
|
||||
|
||||
def _create_remote_socket(self, ip, port):
|
||||
addrs = socket.getaddrinfo(ip, port, 0, socket.SOCK_STREAM,
|
||||
|
|
@ -398,51 +396,50 @@ class TCPRelayHandler(object):
|
|||
remote_sock.setsockopt(socket.SOL_TCP, socket.TCP_NODELAY, 1)
|
||||
return remote_sock
|
||||
|
||||
@shell.exception_handle(self_=True)
|
||||
def _handle_dns_resolved(self, result, error):
|
||||
if error:
|
||||
self._log_error(error)
|
||||
addr, port = self._client_address[0], self._client_address[1]
|
||||
logging.error('%s when handling connection from %s:%d' %
|
||||
(error, addr, port))
|
||||
self.destroy()
|
||||
return
|
||||
if not (result and result[1]):
|
||||
self.destroy()
|
||||
return
|
||||
if result and result[1]:
|
||||
ip = result[1]
|
||||
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 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)
|
||||
try:
|
||||
remote_sock.connect((remote_addr, remote_port))
|
||||
except (OSError, IOError) as e:
|
||||
if eventloop.errno_from_exception(e) == \
|
||||
errno.EINPROGRESS:
|
||||
pass
|
||||
self._loop.add(remote_sock,
|
||||
eventloop.POLL_ERR | eventloop.POLL_OUT,
|
||||
self._server)
|
||||
self._stage = STAGE_CONNECTING
|
||||
self._update_stream(STREAM_UP, WAIT_STATUS_READWRITING)
|
||||
self._update_stream(STREAM_DOWN, WAIT_STATUS_READING)
|
||||
return
|
||||
except Exception as e:
|
||||
shell.print_exception(e)
|
||||
if self._config['verbose']:
|
||||
traceback.print_exc()
|
||||
self.destroy()
|
||||
ip = result[1]
|
||||
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 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)
|
||||
try:
|
||||
remote_sock.connect((remote_addr, remote_port))
|
||||
except (OSError, IOError) as e:
|
||||
if eventloop.errno_from_exception(e) == \
|
||||
errno.EINPROGRESS:
|
||||
pass
|
||||
self._loop.add(remote_sock,
|
||||
eventloop.POLL_ERR | eventloop.POLL_OUT,
|
||||
self._server)
|
||||
self._stage = STAGE_CONNECTING
|
||||
self._update_stream(STREAM_UP, WAIT_STATUS_READWRITING)
|
||||
self._update_stream(STREAM_DOWN, WAIT_STATUS_READING)
|
||||
|
||||
def _write_to_sock_remote(self, data):
|
||||
self._write_to_sock(data, self._remote_sock)
|
||||
|
|
@ -661,10 +658,6 @@ class TCPRelayHandler(object):
|
|||
else:
|
||||
logging.warn('unknown socket')
|
||||
|
||||
def _log_error(self, e):
|
||||
logging.error('%s when handling connection from %s:%d' %
|
||||
(e, self._client_address[0], self._client_address[1]))
|
||||
|
||||
def destroy(self):
|
||||
# destroy the handler and release any resources
|
||||
# promises:
|
||||
|
|
|
|||
Loading…
Reference in a new issue