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Commit 2a31e017 authored by Ken Chen's avatar Ken Chen Committed by Automerger Merge Worker
Browse files

Read DNS query log settings from system property am: 5f01f311 

Original change: https://android-review.googlesource.com/c/platform/packages/modules/DnsResolver/+/2564476



Change-Id: Id7df55d98665fdaff9f5f147d74943e9ad023f54
Signed-off-by: default avatarAutomerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
parents 19515007 5f01f311

DnsQueryLog.cpp

+6 −0
Original line number Diff line number Diff line
@@ -51,6 +51,12 @@ void DnsQueryLog::push(Record&& record) { 
    mQueue.push(std::move(record));

}



uint64_t DnsQueryLog::getLogSizeFromSysProp() {

    const uint64_t logSize = android::base::GetUintProperty<uint64_t>(

            "persist.net.dns_query_log_size", kDefaultLogSize);

    return logSize <= kMaxLogSize ? logSize : kDefaultLogSize;

}



void DnsQueryLog::dump(netdutils::DumpWriter& dw) const {

    dw.println("DNS query log (last %lld minutes):", (mValidityTimeMs / 60000).count());

    netdutils::ScopedIndent indentStats(dw);

DnsQueryLog.h

+7 −2
Original line number Diff line number Diff line
@@ -49,9 +49,10 @@ class DnsQueryLog { 
        const int timeTaken;

    };



    DnsQueryLog() : DnsQueryLog(getLogSizeFromSysProp()) {}



    // Allow the tests to set the capacity and the validaty time in milliseconds.

    DnsQueryLog(size_t size = kDefaultLogSize,

                std::chrono::milliseconds time = kDefaultValidityMinutes)

    DnsQueryLog(size_t size, std::chrono::milliseconds time = kDefaultValidityMinutes)

        : mQueue(size), mValidityTimeMs(time) {}



    void push(Record&& record);
@@ -63,9 +64,13 @@ class DnsQueryLog { 


    // 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;



    // Limit to dump the queries within last |kDefaultValidityMinutes| minutes.

    static constexpr std::chrono::minutes kDefaultValidityMinutes{60};



    uint64_t getLogSizeFromSysProp();

};



}  // namespace android::net

DnsQueryLogTest.cpp

+34 −0
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ 
#include <netdutils/NetNativeTestBase.h>



#include "DnsQueryLog.h"

#include "tests/resolv_test_utils.h"



using namespace std::chrono_literals;
@@ -162,4 +163,37 @@ TEST_F(DnsQueryLogTest, ValidityTime) { 
    verifyDumpOutput(output, {31});

}



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

tests/resolv_test_utils.h

+4 −0
Original line number Diff line number Diff line
@@ -162,6 +162,10 @@ const std::string kSkip4aQueryOnV6LinklocalAddrFlag(kFlagPrefix + 
                                                    "skip_4a_query_on_v6_linklocal_addr");

const std::string kSortNameserversFlag(kFlagPrefix + "sort_nameservers");



const std::string kPersistNetPrefix("persist.net.");



const std::string kQueryLogSize(kPersistNetPrefix + "dns_query_log_size");



static constexpr char kLocalHost[] = "localhost";

static constexpr char kLocalHostAddr[] = "127.0.0.1";

static constexpr char kIp6LocalHost[] = "ip6-localhost";