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