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 "absl/strings/string_view.h" 18 #include "rtc_base/ip_address.h" 19 20 namespace webrtc { 21 22 // Defines an mDNS responder that can be used in ICE candidate gathering, where 23 // the local IP addresses of host candidates are replaced by mDNS hostnames. 24 class MdnsResponderInterface { 25 public: 26 using NameCreatedCallback = 27 std::function<void(const rtc::IPAddress&, absl::string_view)>; 28 using NameRemovedCallback = std::function<void(bool)>; 29 30 MdnsResponderInterface() = default; 31 virtual ~MdnsResponderInterface() = default; 32 33 // Asynchronously creates and returns a new name via `callback` for `addr` if 34 // there is no name mapped to it by this responder, and initializes the 35 // reference count of this name to one. Otherwise the existing name mapped to 36 // `addr` is returned and its reference count is incremented by one. 37 virtual void CreateNameForAddress(const rtc::IPAddress& addr, 38 NameCreatedCallback callback) = 0; 39 // Decrements the reference count of the mapped name of `addr`, if 40 // there is a map created previously via CreateNameForAddress; asynchronously 41 // removes the association between `addr` and its mapped name, and returns 42 // true via `callback` if the decremented reference count reaches zero. 43 // Otherwise no operation is done and false is returned via `callback` 44 // asynchronously. 45 virtual void RemoveNameForAddress(const rtc::IPAddress& addr, 46 NameRemovedCallback callback) = 0; 47 }; 48 49 } // namespace webrtc 50 51 #endif // RTC_BASE_MDNS_RESPONDER_INTERFACE_H_ 52