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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.
*/
#include <regex>
#include <thread>
#include <android-base/strings.h>
#include <android-base/test_utils.h>
#include <gtest/gtest.h>
#include <netdutils/NetNativeTestBase.h>
#include "DnsQueryLog.h"
#include "tests/resolv_test_utils.h"
using namespace std::chrono_literals;
namespace android::net {
namespace {
// Dump the log to STDOUT and capture it.
std::string captureDumpOutput(const DnsQueryLog& queryLog) {
netdutils::DumpWriter dw(STDOUT_FILENO);
CapturedStdout captured;
queryLog.dump(dw);
return captured.str();
}
// A simple check for the dump result by checking the netIds one by one.
void verifyDumpOutput(const std::string& dumpLog, const std::vector<int>& expectedNetIds) {
// Capture three matches: netId, hostname, and answer (empty allowed).
static const std::regex pattern(
R"(netId=(\d+).* hostname=([\w\*]+) answer=\[([\w:,\.\*\s]*)\])");
std::string str(dumpLog);
std::smatch sm;
for (const auto& netId : expectedNetIds) {
SCOPED_TRACE(netId);
EXPECT_TRUE(std::regex_search(str, sm, pattern));
EXPECT_EQ(sm[1], std::to_string(netId));
str = sm.suffix();
}
// Ensure the dumpLog is exactly as expected.
EXPECT_FALSE(std::regex_search(str, sm, pattern));
}
} // namespace
class DnsQueryLogTest : public NetNativeTestBase {
protected:
const std::vector<std::string> serversV4 = {"127.0.0.1", "1.2.3.4"};
const std::vector<std::string> serversV4V6 = {"127.0.0.1", "1.2.3.4", "2001:db8::1",
"fe80:1::2%testnet"};
};
TEST_F(DnsQueryLogTest, Push) {
std::vector<DnsQueryLog::Record> records = {
DnsQueryLog::Record(30, 1000, 1000, "example.com", serversV4, 10),
DnsQueryLog::Record(31, 1000, 1000, "", serversV4, 10), // Empty hostname.
DnsQueryLog::Record(32, 1000, 1000, "example.com", {}, 10), // No answer.
DnsQueryLog::Record(33, 1000, 1000, "example.com", serversV4V6, 10),
};
DnsQueryLog queryLog;
for (auto& r : records) {
queryLog.push(std::move(r));
}
std::string output = captureDumpOutput(queryLog);
verifyDumpOutput(output, {30, 31, 32, 33});
}
TEST_F(DnsQueryLogTest, PushStressTest) {
const int threadNum = 100;
const int pushNum = 1000;
const size_t size = 500;
DnsQueryLog queryLog(size);
std::vector<std::thread> threads(threadNum);
// Launch 'threadNum' threads to push the same queryLog 'pushNum' times.
for (auto& thread : threads) {
thread = std::thread([&]() {
for (int i = 0; i < pushNum; i++) {
DnsQueryLog::Record record(30, 1000, 1000, "www.example.com", serversV4, 10);
queryLog.push(std::move(record));
}
});
}
for (auto& thread : threads) {
thread.join();
}
// Verify there are exact 'size' records in queryLog.
std::string output = captureDumpOutput(queryLog);
verifyDumpOutput(output, std::vector(size, 30));
}
TEST_F(DnsQueryLogTest, ZeroSize) {
const size_t size = 0;
DnsQueryLog::Record r1(30, 1000, 1000, "www.example1.com", serversV4V6, 10);
DnsQueryLog::Record r2(31, 1000, 1000, "www.example2.com", serversV4V6, 10);
DnsQueryLog::Record r3(32, 1000, 1000, "www.example3.com", serversV4V6, 10);
DnsQueryLog queryLog(size);
queryLog.push(std::move(r1));
queryLog.push(std::move(r2));
queryLog.push(std::move(r3));
std::string output = captureDumpOutput(queryLog);
verifyDumpOutput(output, {});
}
TEST_F(DnsQueryLogTest, CapacityFull) {
const size_t size = 3;
DnsQueryLog::Record r1(30, 1000, 1000, "www.example1.com", serversV4V6, 10);
DnsQueryLog::Record r2(31, 1000, 1000, "www.example2.com", serversV4V6, 10);
DnsQueryLog::Record r3(32, 1000, 1000, "www.example3.com", serversV4V6, 10);
DnsQueryLog::Record r4(33, 1000, 1000, "www.example4.com", serversV4V6, 10);
const std::vector<int> expectedNetIds = {31, 32, 33};
DnsQueryLog queryLog(size);
queryLog.push(std::move(r1));
queryLog.push(std::move(r2));
queryLog.push(std::move(r3));
queryLog.push(std::move(r4));
std::string output = captureDumpOutput(queryLog);
verifyDumpOutput(output, expectedNetIds);
}
TEST_F(DnsQueryLogTest, SizeCustomization) {
const size_t logSize = 3;
const ScopedSystemProperties sp(kQueryLogSize, std::to_string(logSize));
DnsQueryLog queryLog;
for (int i = 0; i < 200; i++) {
DnsQueryLog::Record record(30, 1000, 1000, "www.example.com", serversV4, 10);
queryLog.push(std::move(record));
}
// Verify that there are exact customized number of records in queryLog.
const std::string output = captureDumpOutput(queryLog);
verifyDumpOutput(output, std::vector(logSize, 30));
}
TEST_F(DnsQueryLogTest, InvalidSizeCustomization) {
// The max log size defined in DnsQueryLog.h is 10000.
for (const auto& logSize : {"-1", "10001", "non-digit"}) {
const ScopedSystemProperties sp(kQueryLogSize, logSize);
DnsQueryLog queryLog;
for (int i = 0; i < 300; i++) {
DnsQueryLog::Record record(30, 1000, 1000, "www.example.com", serversV4, 10);
queryLog.push(std::move(record));
}
// Verify that queryLog has the default number of records. The default size defined in
// DnsQueryLog.h is 200.
const std::string output = captureDumpOutput(queryLog);
verifyDumpOutput(output, std::vector(200, 30));
}
}
} // namespace android::net
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