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78 lines
2.4 KiB
78 lines
2.4 KiB
4 months ago
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/*
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* Copyright (C) 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "client/mdns_utils.h"
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#include <android-base/strings.h>
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namespace mdns {
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// <Instance>.<Service>.<Domain>
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std::optional<MdnsInstance> mdns_parse_instance_name(std::string_view name) {
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CHECK(!name.empty());
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// Return the whole name if it doesn't fall under <Instance>.<Service>.<Domain> or
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// <Instance>.<Service>
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bool has_local_suffix = false;
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// Strip the local suffix, if any
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{
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std::string local_suffix = ".local";
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local_suffix += android::base::EndsWith(name, ".") ? "." : "";
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if (android::base::ConsumeSuffix(&name, local_suffix)) {
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if (name.empty()) {
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return std::nullopt;
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}
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has_local_suffix = true;
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}
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}
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std::string transport;
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// Strip the transport suffix, if any
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{
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std::string add_dot = (!has_local_suffix && android::base::EndsWith(name, ".")) ? "." : "";
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std::array<std::string, 2> transport_suffixes{"._tcp", "._udp"};
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for (const auto& t : transport_suffixes) {
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if (android::base::ConsumeSuffix(&name, t + add_dot)) {
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if (name.empty()) {
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return std::nullopt;
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}
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transport = t.substr(1);
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break;
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}
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}
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if (has_local_suffix && transport.empty()) {
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return std::nullopt;
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}
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}
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if (!has_local_suffix && transport.empty()) {
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return std::make_optional<MdnsInstance>(name, "", "");
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}
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// Split the service name from the instance name
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auto pos = name.rfind(".");
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if (pos == 0 || pos == std::string::npos || pos == name.size() - 1) {
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return std::nullopt;
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}
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return std::make_optional<MdnsInstance>(name.substr(0, pos), name.substr(pos + 1), transport);
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}
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} // namespace mdns
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