def proc_udp_request(self, req):
self.client_associate = (req.dstaddr, req.dstport)
self.last_clientaddr = self.client_associate
self.client2local_udpsock = bind_local_udp(self.socksconn)
self.local2remote_udpsock = bind_local_udp(self.remoteconn)
if not self.client2local_udpsock or not self.local2remote_udpsock:
request_fail(self.socksconn, req, GENERAL_SOCKS_SERVER_FAILURE)
return False
self.track_sock(self.client2local_udpsock)
self.track_sock(self.local2remote_udpsock)
send_request(self.remoteconn, UDP_ASSOCIATE, *sock_addr_info(self.local2remote_udpsock))
reply = read_reply(self.remoteconn)
if reply.rep != SUCCEEDED:
return False
self.remote_associate = (reply.bndaddr, reply.bndport)
request_success(self.socksconn, *sock_addr_info(self.client2local_udpsock))
return True
def forward_socks5_udp(self, url, localhandler, firstdata, firstaddr):
remoteconn = socket.create_connection((url.hostname, url.port), self.timeout)
remoteconn.settimeout(self.timeout)
handler = SocksForwardSession(self.socksconn, remoteconn)
# copy already-exist states from local handler
handler.client_associate = localhandler.client_associate
handler.last_clientaddr = localhandler.last_clientaddr
handler.client2local_udpsock = localhandler.client2local_udpsock
handler.track_sock(handler.client2local_udpsock)
self.handler = handler
# handshake, then request-reply, then send first packet, finally start to pipe
if self.forward_socks5_handshake(handler.remoteconn):
handler.local2remote_udpsock = utils.bind_local_udp(handler.remoteconn)
handler.track_sock(handler.local2remote_udpsock)
utils.send_request(handler.remoteconn, msg.UDP_ASSOCIATE, *utils.sock_addr_info(handler.local2remote_udpsock))
reply = utils.read_reply(handler.remoteconn)
if reply.rep != msg.SUCCEEDED:
return False
handler.remote_associate = (reply.bndaddr, reply.bndport)
handler.last_clientaddr = firstaddr
handler.local2remote_udpsock.sendto(firstdata, handler.remote_associate)
handler.relay_udp()
return True