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/*
* Copyright (C) 2019 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.
*
*/
#pragma once
#include <string>
#include <vector>
#include <netdutils/DumpWriter.h>
#include "LockedQueue.h"
namespace android::net {
// This class stores query records in a locked ring buffer. It's thread-safe for concurrent access.
class DnsQueryLog {
public:
static constexpr std::string_view DUMP_KEYWORD = "querylog";
struct Record {
Record(uint32_t netId, uid_t uid, pid_t pid, const std::string& hostname,
const std::vector<std::string>& addrs, int timeTaken)
: netId(netId),
uid(uid),
pid(pid),
hostname(hostname),
addrs(addrs),
timeTaken(timeTaken) {}
const uint32_t netId;
const uid_t uid;
const pid_t pid;
const std::chrono::system_clock::time_point timestamp = std::chrono::system_clock::now();
const std::string hostname;
const std::vector<std::string> addrs;
const int timeTaken;
};
DnsQueryLog() : DnsQueryLog(getLogSizeFromSysProp()) {}
// Allow the tests to set the capacity.
DnsQueryLog(size_t size) : mQueue(size) {}
void push(Record&& record);
void dump(netdutils::DumpWriter& dw) const;
private:
LockedRingBuffer<Record> mQueue;
// The capacity of the circular buffer.
static constexpr size_t kDefaultLogSize = 200;
// The upper bound of the circular buffer.
static constexpr size_t kMaxLogSize = 10000;
uint64_t getLogSizeFromSysProp();
};
} // namespace android::net
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