| /* |
| * 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; |
| }; |
| |
| // Allow the tests to set the capacity and the validaty time in milliseconds. |
| DnsQueryLog(size_t size = kDefaultLogSize, |
| std::chrono::milliseconds time = kDefaultValidityMinutes) |
| : mQueue(size), mValidityTimeMs(time) {} |
| |
| void push(Record&& record); |
| void dump(netdutils::DumpWriter& dw) const; |
| |
| private: |
| LockedRingBuffer<Record> mQueue; |
| const std::chrono::milliseconds mValidityTimeMs; |
| |
| // The capacity of the circular buffer. |
| static constexpr size_t kDefaultLogSize = 200; |
| |
| // Limit to dump the queries within last |kDefaultValidityMinutes| minutes. |
| static constexpr std::chrono::minutes kDefaultValidityMinutes{60}; |
| }; |
| |
| } // namespace android::net |