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/**
* Copyright (c) 2022, 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.
*/
#define LOG_TAG "MDnsService"
#include "MDnsService.h"
#include <android-base/properties.h>
#include <binder/Status.h>
#include <binder_utils/BinderUtil.h>
using android::net::mdns::aidl::DiscoveryInfo;
using android::net::mdns::aidl::GetAddressInfo;
using android::net::mdns::aidl::IMDnsEventListener;
using android::net::mdns::aidl::RegistrationInfo;
using android::net::mdns::aidl::ResolutionInfo;
using std::literals::chrono_literals::operator""s;
namespace android::net {
#define MDNS_SERVICE_NAME "mdnsd"
#define MDNS_SERVICE_STATUS "init.svc.mdnsd"
// TODO: DnsResolver has same macro definition but returns ScopedAStatus. Move these macros to
// BinderUtil.h to do the same permission check.
#define ENFORCE_ANY_PERMISSION(...) \
do { \
binder::Status status = checkAnyPermission({__VA_ARGS__}); \
if (!status.isOk()) { \
return status; \
} \
} while (0)
#define ENFORCE_NETWORK_STACK_PERMISSIONS() \
ENFORCE_ANY_PERMISSION(PERM_NETWORK_STACK, PERM_MAINLINE_NETWORK_STACK)
status_t MDnsService::start() {
IPCThreadState::self()->disableBackgroundScheduling(true);
const status_t ret = BinderService<MDnsService>::publish();
if (ret != android::OK) {
return ret;
}
return android::OK;
}
binder::Status MDnsService::startDaemon() {
ENFORCE_NETWORK_STACK_PERMISSIONS();
if (android::base::GetProperty(MDNS_SERVICE_STATUS, "") == "running") {
return android::binder::Status::fromServiceSpecificError(EBUSY, strerror(EBUSY));
}
ALOGD("Starting MDNSD");
android::base::SetProperty("ctl.start", MDNS_SERVICE_NAME);
// To maintain the same behavior as before, the returned value is not checked.
android::base::WaitForProperty(MDNS_SERVICE_STATUS, "running", 5s);
return binder::Status::ok();
}
binder::Status MDnsService::stopDaemon() {
ENFORCE_NETWORK_STACK_PERMISSIONS();
ALOGD("Stopping MDNSD");
android::base::SetProperty("ctl.stop", MDNS_SERVICE_NAME);
android::base::WaitForProperty(MDNS_SERVICE_STATUS, "stopped", 5s);
return binder::Status::ok();
}
binder::Status MDnsService::registerService(const RegistrationInfo&) {
// TODO(b/298594687): switch from EX_SERVICE_SPECIFIC to DEPRECATED when tethering module
// for 2024-02 release is fully rolled out and prebuilt updated in AP1A.xxxxxx.yy build.
// Return EX_SERVICE_SPECIFIC for short-term only because callers in tethering module do not
// catch the EX_UNSUPPORTED_OPERATION. It will throw an exception and cause a fatal exception.
// The EX_UNSUPPORTED_OPERATION has been catched in tethering module since 2024-02 release.
// TODO(b/298594687): switch to DEPRECATED.
return binder::Status::fromExceptionCode(binder::Status::EX_SERVICE_SPECIFIC);
// DEPRECATED;
}
binder::Status MDnsService::discover(const DiscoveryInfo&) {
// TODO(b/298594687): switch to DEPRECATED.
return binder::Status::fromExceptionCode(binder::Status::EX_SERVICE_SPECIFIC);
// DEPRECATED;
}
binder::Status MDnsService::resolve(const ResolutionInfo&) {
// TODO(b/298594687): switch to DEPRECATED.
return binder::Status::fromExceptionCode(binder::Status::EX_SERVICE_SPECIFIC);
// DEPRECATED;
}
binder::Status MDnsService::getServiceAddress(const GetAddressInfo&) {
// TODO(b/298594687): switch to DEPRECATED.
return binder::Status::fromExceptionCode(binder::Status::EX_SERVICE_SPECIFIC);
// DEPRECATED;
}
binder::Status MDnsService::stopOperation(int32_t) {
// TODO(b/298594687): switch to DEPRECATED.
return binder::Status::fromExceptionCode(binder::Status::EX_SERVICE_SPECIFIC);
// DEPRECATED;
}
binder::Status MDnsService::registerEventListener(const android::sp<IMDnsEventListener>&) {
// TODO(b/298594687): switch to DEPRECATED.
return binder::Status::fromExceptionCode(binder::Status::EX_SERVICE_SPECIFIC);
// DEPRECATED;
}
binder::Status MDnsService::unregisterEventListener(const android::sp<IMDnsEventListener>&) {
// TODO(b/298594687): switch to DEPRECATED.
return binder::Status::fromExceptionCode(binder::Status::EX_SERVICE_SPECIFIC);
// DEPRECATED;
}
} // namespace android::net
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