1 /* 2 * Copyright 2018 The WebRTC Project Authors. All rights reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #ifndef RTC_BASE_MDNS_RESPONDER_INTERFACE_H_ 12 #define RTC_BASE_MDNS_RESPONDER_INTERFACE_H_ 13 14 #include <functional> 15 #include <string> 16 17 #include "rtc_base/ip_address.h" 18 19 namespace webrtc { 20 21 // Defines an mDNS responder that can be used in ICE candidate gathering, where 22 // the local IP addresses of host candidates are replaced by mDNS hostnames. 23 class MdnsResponderInterface { 24 public: 25 using NameCreatedCallback = 26 std::function<void(const rtc::IPAddress&, const std::string&)>; 27 using NameRemovedCallback = std::function<void(bool)>; 28 29 MdnsResponderInterface() = default; 30 virtual ~MdnsResponderInterface() = default; 31 32 // Asynchronously creates and returns a new name via |callback| for |addr| if 33 // there is no name mapped to it by this responder, and initializes the 34 // reference count of this name to one. Otherwise the existing name mapped to 35 // |addr| is returned and its reference count is incremented by one. 36 virtual void CreateNameForAddress(const rtc::IPAddress& addr, 37 NameCreatedCallback callback) = 0; 38 // Decrements the reference count of the mapped name of |addr|, if 39 // there is a map created previously via CreateNameForAddress; asynchronously 40 // removes the association between |addr| and its mapped name, and returns 41 // true via |callback| if the decremented reference count reaches zero. 42 // Otherwise no operation is done and false is returned via |callback| 43 // asynchronously. 44 virtual void RemoveNameForAddress(const rtc::IPAddress& addr, 45 NameRemovedCallback callback) = 0; 46 }; 47 48 } // namespace webrtc 49 50 #endif // RTC_BASE_MDNS_RESPONDER_INTERFACE_H_ 51