/*
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* Copyright (C) 2016 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 "adb_mdns.h"
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#include "sysdeps.h"
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#include <dns_sd.h>
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#include <endian.h>
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#include <unistd.h>
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#include <chrono>
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#include <mutex>
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#include <thread>
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#include <android-base/logging.h>
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#include <android-base/properties.h>
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using namespace std::chrono_literals;
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static std::mutex& mdns_lock = *new std::mutex();
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static int port;
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static DNSServiceRef mdns_ref;
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static bool mdns_registered = false;
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static void start_mdns() {
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if (android::base::GetProperty("init.svc.mdnsd", "") == "running") {
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return;
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}
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android::base::SetProperty("ctl.start", "mdnsd");
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if (! android::base::WaitForProperty("init.svc.mdnsd", "running", 5s)) {
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LOG(ERROR) << "Could not start mdnsd.";
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}
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}
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static void mdns_callback(DNSServiceRef /*ref*/,
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DNSServiceFlags /*flags*/,
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DNSServiceErrorType errorCode,
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const char* /*name*/,
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const char* /*regtype*/,
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const char* /*domain*/,
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void* /*context*/) {
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if (errorCode != kDNSServiceErr_NoError) {
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LOG(ERROR) << "Encountered mDNS registration error ("
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<< errorCode << ").";
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}
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}
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static void setup_mdns_thread() {
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start_mdns();
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std::lock_guard<std::mutex> lock(mdns_lock);
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std::string hostname = "adb-";
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hostname += android::base::GetProperty("ro.serialno", "unidentified");
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auto error = DNSServiceRegister(&mdns_ref, 0, 0, hostname.c_str(),
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kADBServiceType, nullptr, nullptr,
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htobe16((uint16_t)port), 0, nullptr,
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mdns_callback, nullptr);
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if (error != kDNSServiceErr_NoError) {
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LOG(ERROR) << "Could not register mDNS service (" << error << ").";
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return;
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}
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mdns_registered = true;
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}
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static void teardown_mdns() {
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std::lock_guard<std::mutex> lock(mdns_lock);
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if (mdns_registered) {
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DNSServiceRefDeallocate(mdns_ref);
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}
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}
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void setup_mdns(int port_in) {
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port = port_in;
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std::thread(setup_mdns_thread).detach();
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// TODO: Make this more robust against a hard kill.
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atexit(teardown_mdns);
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}
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