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/**
* Copyright (c) 2021, 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 "unsolicited_event_listener.h"
#include <thread>
#include <android-base/chrono_utils.h>
#include <android-base/format.h>
namespace android::net::resolv::aidl {
using ::aidl::android::net::resolv::aidl::DnsHealthEventParcel;
using ::aidl::android::net::resolv::aidl::IDnsResolverUnsolicitedEventListener;
using ::aidl::android::net::resolv::aidl::Nat64PrefixEventParcel;
using ::aidl::android::net::resolv::aidl::PrivateDnsValidationEventParcel;
using android::base::Error;
using android::base::Result;
using android::base::ScopedLockAssertion;
using std::chrono::milliseconds;
constexpr milliseconds kEventTimeoutMs{5000};
constexpr milliseconds kRetryIntervalMs{20};
::ndk::ScopedAStatus UnsolicitedEventListener::onDnsHealthEvent(const DnsHealthEventParcel& event) {
std::lock_guard lock(mMutex);
if (event.netId == mNetId) mDnsHealthResultRecords.push(event.healthResult);
return ::ndk::ScopedAStatus::ok();
}
::ndk::ScopedAStatus UnsolicitedEventListener::onNat64PrefixEvent(
const Nat64PrefixEventParcel& event) {
std::lock_guard lock(mMutex);
mUnexpectedNat64PrefixUpdates++;
if (event.netId == mNetId) {
mNat64PrefixAddress = (event.prefixOperation ==
IDnsResolverUnsolicitedEventListener::PREFIX_OPERATION_ADDED)
? event.prefixAddress
: "";
}
return ::ndk::ScopedAStatus::ok();
}
::ndk::ScopedAStatus UnsolicitedEventListener::onPrivateDnsValidationEvent(
const PrivateDnsValidationEventParcel& event) {
{
std::lock_guard lock(mMutex);
// keep updating the server to have latest validation status.
mValidationRecords.insert_or_assign({event.netId, event.ipAddress, event.protocol},
event.validation);
}
mCv.notify_one();
return ::ndk::ScopedAStatus::ok();
}
bool UnsolicitedEventListener::waitForPrivateDnsValidation(const std::string& serverAddr,
int validation, int protocol) {
const auto now = std::chrono::steady_clock::now();
std::unique_lock lock(mMutex);
ScopedLockAssertion assume_lock(mMutex);
// onPrivateDnsValidationEvent() might already be invoked. Search for the record first.
do {
if (findAndRemoveValidationRecord({mNetId, serverAddr, protocol}, validation)) return true;
} while (mCv.wait_until(lock, now + kEventTimeoutMs) != std::cv_status::timeout);
// Timeout.
return false;
}
bool UnsolicitedEventListener::findAndRemoveValidationRecord(const ServerKey& key, int value) {
auto it = mValidationRecords.find(key);
if (it != mValidationRecords.end() && it->second == value) {
mValidationRecords.erase(it);
return true;
}
return false;
}
bool UnsolicitedEventListener::waitForNat64Prefix(int operation, const milliseconds& timeout) {
android::base::Timer t;
while (t.duration() < timeout) {
{
std::lock_guard lock(mMutex);
if ((operation == IDnsResolverUnsolicitedEventListener::PREFIX_OPERATION_ADDED &&
!mNat64PrefixAddress.empty()) ||
(operation == IDnsResolverUnsolicitedEventListener::PREFIX_OPERATION_REMOVED &&
mNat64PrefixAddress.empty())) {
mUnexpectedNat64PrefixUpdates--;
return true;
}
}
std::this_thread::sleep_for(kRetryIntervalMs);
}
return false;
}
Result<int> UnsolicitedEventListener::popDnsHealthResult() {
// Wait until the queue is not empty or timeout.
android::base::Timer t;
while (t.duration() < milliseconds{1000}) {
{
std::lock_guard lock(mMutex);
if (!mDnsHealthResultRecords.empty()) break;
}
std::this_thread::sleep_for(kRetryIntervalMs);
}
std::lock_guard lock(mMutex);
if (mDnsHealthResultRecords.empty()) return Error() << "Dns health result record is empty";
auto ret = mDnsHealthResultRecords.front();
mDnsHealthResultRecords.pop();
return ret;
}
} // namespace android::net::resolv::aidl
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