1 /* 2 * Copyright (C) 2020 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 <optional> 20 #include <string_view> 21 22 #include "adb_wifi.h" 23 24 namespace mdns { 25 26 struct MdnsInstance { 27 std::string instance_name; // "my name" 28 std::string service_name; // "_adb-tls-connect" 29 std::string transport_type; // either "_tcp" or "_udp" 30 MdnsInstanceMdnsInstance31 MdnsInstance(std::string_view inst, std::string_view serv, std::string_view trans) 32 : instance_name(inst), service_name(serv), transport_type(trans) {} 33 }; 34 35 // This parser is based on https://tools.ietf.org/html/rfc6763#section-4.1 for 36 // structured service instance names, where the whole name is in the format 37 // <Instance>.<Service>.<Domain>. 38 // 39 // In our case, we ignore <Domain> portion of the name, which 40 // we always assume to be ".local", or link-local mDNS. 41 // 42 // The string can be in one of the following forms: 43 // - <Instance>.<Service>.<Domain>.? 44 // - e.g. "instance._service._tcp.local" (or "...local.") 45 // - <Instance>.<Service>.? (must contain either "_tcp" or "_udp" at the end) 46 // - e.g. "instance._service._tcp" (or "..._tcp.) 47 // - <Instance> (can contain dots '.') 48 // - e.g. "myname", "name.", "my.name." 49 // 50 // Returns an MdnsInstance with the appropriate fields filled in (instance name is never empty), 51 // otherwise returns std::nullopt. 52 std::optional<MdnsInstance> mdns_parse_instance_name(std::string_view name); 53 54 } // namespace mdns 55