1 /* 2 * Copyright (C) 2019 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #pragma once 18 19 #include <https/PlainSocket.h> 20 #include <https/RunLoop.h> 21 #include <memory> 22 23 #include <arpa/inet.h> 24 25 struct STUNClient : public std::enable_shared_from_this<STUNClient> { 26 using Callback = std::function<void(int, const std::string &)>; 27 28 explicit STUNClient( 29 std::shared_ptr<RunLoop> runLoop, 30 const sockaddr_in &addr, 31 Callback cb); 32 33 void run(); 34 35 private: 36 static constexpr size_t kMaxUDPPayloadSize = 1536; 37 static constexpr size_t kMaxNumRetries = 5; 38 39 static constexpr std::chrono::duration kTimeoutDelay = 40 std::chrono::seconds(1); 41 42 std::shared_ptr<RunLoop> mRunLoop; 43 sockaddr_in mRemoteAddr; 44 Callback mCallback; 45 46 std::shared_ptr<PlainSocket> mSocket; 47 48 RunLoop::Token mTimeoutToken; 49 size_t mNumRetriesLeft; 50 51 void onSendRequest(); 52 void onReceiveResponse(); 53 54 void scheduleRequest(); 55 void onTimeout(); 56 }; 57