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165 lines
5.5 KiB
165 lines
5.5 KiB
/*
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* Copyright (C) 2019 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 <regex>
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#include <thread>
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#include <android-base/strings.h>
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#include <android-base/test_utils.h>
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#include <gtest/gtest.h>
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#include "DnsQueryLog.h"
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using namespace std::chrono_literals;
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namespace android::net {
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namespace {
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// Dump the log to STDOUT and capture it.
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std::string captureDumpOutput(const DnsQueryLog& queryLog) {
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netdutils::DumpWriter dw(STDOUT_FILENO);
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CapturedStdout captured;
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queryLog.dump(dw);
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return captured.str();
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}
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// A simple check for the dump result by checking the netIds one by one.
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void verifyDumpOutput(const std::string& dumpLog, const std::vector<int>& expectedNetIds) {
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// Capture three matches: netId, hostname, and answer (empty allowed).
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static const std::regex pattern(
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R"(netId=(\d+).* hostname=([\w\*]+) answer=\[([\w:,\.\*\s]*)\])");
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std::string str(dumpLog);
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std::smatch sm;
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for (const auto& netId : expectedNetIds) {
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SCOPED_TRACE(netId);
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EXPECT_TRUE(std::regex_search(str, sm, pattern));
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EXPECT_EQ(sm[1], std::to_string(netId));
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str = sm.suffix();
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}
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// Ensure the dumpLog is exactly as expected.
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EXPECT_FALSE(std::regex_search(str, sm, pattern));
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}
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} // namespace
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class DnsQueryLogTest : public ::testing::Test {
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protected:
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const std::vector<std::string> serversV4 = {"127.0.0.1", "1.2.3.4"};
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const std::vector<std::string> serversV4V6 = {"127.0.0.1", "1.2.3.4", "2001:db8::1",
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"fe80:1::2%testnet"};
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};
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TEST_F(DnsQueryLogTest, Push) {
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std::vector<DnsQueryLog::Record> records = {
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DnsQueryLog::Record(30, 1000, 1000, "example.com", serversV4, 10),
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DnsQueryLog::Record(31, 1000, 1000, "", serversV4, 10), // Empty hostname.
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DnsQueryLog::Record(32, 1000, 1000, "example.com", {}, 10), // No answer.
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DnsQueryLog::Record(33, 1000, 1000, "example.com", serversV4V6, 10),
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};
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DnsQueryLog queryLog;
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for (auto& r : records) {
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queryLog.push(std::move(r));
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}
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std::string output = captureDumpOutput(queryLog);
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verifyDumpOutput(output, {30, 31, 32, 33});
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}
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TEST_F(DnsQueryLogTest, PushStressTest) {
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const int threadNum = 100;
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const int pushNum = 1000;
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const size_t size = 500;
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DnsQueryLog queryLog(size);
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std::vector<std::thread> threads(threadNum);
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// Launch 'threadNum' threads to push the same queryLog 'pushNum' times.
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for (auto& thread : threads) {
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thread = std::thread([&]() {
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for (int i = 0; i < pushNum; i++) {
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DnsQueryLog::Record record(30, 1000, 1000, "www.example.com", serversV4, 10);
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queryLog.push(std::move(record));
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}
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});
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}
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for (auto& thread : threads) {
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thread.join();
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}
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// Verify there are exact 'size' records in queryLog.
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std::string output = captureDumpOutput(queryLog);
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verifyDumpOutput(output, std::vector(size, 30));
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}
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TEST_F(DnsQueryLogTest, ZeroSize) {
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const size_t size = 0;
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DnsQueryLog::Record r1(30, 1000, 1000, "www.example1.com", serversV4V6, 10);
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DnsQueryLog::Record r2(31, 1000, 1000, "www.example2.com", serversV4V6, 10);
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DnsQueryLog::Record r3(32, 1000, 1000, "www.example3.com", serversV4V6, 10);
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DnsQueryLog queryLog(size);
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queryLog.push(std::move(r1));
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queryLog.push(std::move(r2));
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queryLog.push(std::move(r3));
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std::string output = captureDumpOutput(queryLog);
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verifyDumpOutput(output, {});
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}
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TEST_F(DnsQueryLogTest, CapacityFull) {
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const size_t size = 3;
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DnsQueryLog::Record r1(30, 1000, 1000, "www.example1.com", serversV4V6, 10);
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DnsQueryLog::Record r2(31, 1000, 1000, "www.example2.com", serversV4V6, 10);
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DnsQueryLog::Record r3(32, 1000, 1000, "www.example3.com", serversV4V6, 10);
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DnsQueryLog::Record r4(33, 1000, 1000, "www.example4.com", serversV4V6, 10);
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const std::vector<int> expectedNetIds = {31, 32, 33};
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DnsQueryLog queryLog(size);
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queryLog.push(std::move(r1));
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queryLog.push(std::move(r2));
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queryLog.push(std::move(r3));
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queryLog.push(std::move(r4));
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std::string output = captureDumpOutput(queryLog);
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verifyDumpOutput(output, expectedNetIds);
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}
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TEST_F(DnsQueryLogTest, ValidityTime) {
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DnsQueryLog::Record r1(30, 1000, 1000, "www.example.com", serversV4, 10);
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DnsQueryLog queryLog(3, 100ms);
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queryLog.push(std::move(r1));
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// Dump the output and verify the correctness by checking netId.
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std::string output = captureDumpOutput(queryLog);
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verifyDumpOutput(output, {30});
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std::this_thread::sleep_for(150ms);
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// The record is expired thus not shown in the output.
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output = captureDumpOutput(queryLog);
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verifyDumpOutput(output, {});
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// Push another record to ensure it still works.
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DnsQueryLog::Record r2(31, 1000, 1000, "example.com", serversV4V6, 10);
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queryLog.push(std::move(r2));
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output = captureDumpOutput(queryLog);
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verifyDumpOutput(output, {31});
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}
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} // namespace android::net
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