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android13/packages/modules/DnsResolver/tests/resolv_tls_unit_test.cpp

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/*
* Copyright (C) 2018 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.
*/
#define LOG_TAG "resolv"
#include <arpa/inet.h>
#include <chrono>
#include <android-base/logging.h>
#include <android-base/macros.h>
#include <gmock/gmock.h>
#include <gtest/gtest.h>
#include <netdutils/Slice.h>
#include "DnsTlsDispatcher.h"
#include "DnsTlsQueryMap.h"
#include "DnsTlsServer.h"
#include "DnsTlsSessionCache.h"
#include "DnsTlsSocket.h"
#include "DnsTlsTransport.h"
#include "Experiments.h"
#include "IDnsTlsSocket.h"
#include "IDnsTlsSocketFactory.h"
#include "IDnsTlsSocketObserver.h"
#include "tests/dns_responder/dns_tls_frontend.h"
#include "tests/resolv_test_base.h"
namespace android {
namespace net {
using netdutils::IPAddress;
using netdutils::IPSockAddr;
using netdutils::makeSlice;
using netdutils::Slice;
typedef std::vector<uint8_t> bytevec;
static const std::string DOT_MAXTRIES_FLAG = "dot_maxtries";
static const std::string SERVERNAME1 = "dns.example.com";
static const std::string SERVERNAME2 = "dns.example.org";
static const IPAddress V4ADDR1 = IPAddress::forString("192.0.2.1");
static const IPAddress V4ADDR2 = IPAddress::forString("192.0.2.2");
static const IPAddress V6ADDR1 = IPAddress::forString("2001:db8::1");
static const IPAddress V6ADDR2 = IPAddress::forString("2001:db8::2");
// BaseTest just provides constants that are useful for the tests.
class BaseTest : public ResolvTestBase {
protected:
BaseTest() {
SERVER1.name = SERVERNAME1;
}
DnsTlsServer SERVER1{V4ADDR1};
};
bytevec make_query(uint16_t id, size_t size) {
bytevec vec(size);
vec[0] = id >> 8;
vec[1] = id;
// Arbitrarily fill the query body with unique data.
for (size_t i = 2; i < size; ++i) {
vec[i] = id + i;
}
return vec;
}
// Query constants
const unsigned NETID = 123;
const unsigned MARK = 123;
const uint16_t ID = 52;
const uint16_t SIZE = 22;
const bytevec QUERY = make_query(ID, SIZE);
template <class T>
class FakeSocketFactory : public IDnsTlsSocketFactory {
public:
FakeSocketFactory() {}
std::unique_ptr<IDnsTlsSocket> createDnsTlsSocket(
const DnsTlsServer& server ATTRIBUTE_UNUSED,
unsigned mark ATTRIBUTE_UNUSED,
IDnsTlsSocketObserver* observer,
DnsTlsSessionCache* cache ATTRIBUTE_UNUSED) override {
return std::make_unique<T>(observer);
}
};
bytevec make_echo(uint16_t id, const Slice query) {
bytevec response(query.size() + 2);
response[0] = id >> 8;
response[1] = id;
// Echo the query as the fake response.
memcpy(response.data() + 2, query.base(), query.size());
return response;
}
// Simplest possible fake server. This just echoes the query as the response.
class FakeSocketEcho : public IDnsTlsSocket {
public:
explicit FakeSocketEcho(IDnsTlsSocketObserver* observer) : mObserver(observer) {}
bool query(uint16_t id, const Slice query) override {
// Return the response immediately (asynchronously).
std::thread(&IDnsTlsSocketObserver::onResponse, mObserver, make_echo(id, query)).detach();
return true;
}
bool startHandshake() override { return true; }
private:
IDnsTlsSocketObserver* const mObserver;
};
class TransportTest : public BaseTest {};
TEST_F(TransportTest, Query) {
FakeSocketFactory<FakeSocketEcho> factory;
DnsTlsTransport transport(SERVER1, MARK, &factory);
auto r = transport.query(makeSlice(QUERY)).get();
EXPECT_EQ(DnsTlsTransport::Response::success, r.code);
EXPECT_EQ(QUERY, r.response);
EXPECT_EQ(transport.getConnectCounter(), 1);
}
// Fake Socket that echoes the observed query ID as the response body.
class FakeSocketId : public IDnsTlsSocket {
public:
explicit FakeSocketId(IDnsTlsSocketObserver* observer) : mObserver(observer) {}
bool query(uint16_t id, const Slice query ATTRIBUTE_UNUSED) override {
// Return the response immediately (asynchronously).
bytevec response(4);
// Echo the ID in the header to match the response to the query.
// This will be overwritten by DnsTlsQueryMap.
response[0] = id >> 8;
response[1] = id;
// Echo the ID in the body, so that the test can verify which ID was used by
// DnsTlsQueryMap.
response[2] = id >> 8;
response[3] = id;
std::thread(&IDnsTlsSocketObserver::onResponse, mObserver, response).detach();
return true;
}
bool startHandshake() override { return true; }
private:
IDnsTlsSocketObserver* const mObserver;
};
// Test that IDs are properly reused
TEST_F(TransportTest, IdReuse) {
FakeSocketFactory<FakeSocketId> factory;
DnsTlsTransport transport(SERVER1, MARK, &factory);
for (int i = 0; i < 100; ++i) {
// Send a query.
std::future<DnsTlsTransport::Result> f = transport.query(makeSlice(QUERY));
// Wait for the response.
DnsTlsTransport::Result r = f.get();
EXPECT_EQ(DnsTlsTransport::Response::success, r.code);
// All queries should have an observed ID of zero, because it is returned to the ID pool
// after each use.
EXPECT_EQ(0, (r.response[2] << 8) | r.response[3]);
}
EXPECT_EQ(transport.getConnectCounter(), 1);
}
// These queries might be handled in serial or parallel as they race the
// responses.
TEST_F(TransportTest, RacingQueries_10000) {
FakeSocketFactory<FakeSocketEcho> factory;
DnsTlsTransport transport(SERVER1, MARK, &factory);
std::vector<std::future<DnsTlsTransport::Result>> results;
// Fewer than 65536 queries to avoid ID exhaustion.
const int num_queries = 10000;
results.reserve(num_queries);
for (int i = 0; i < num_queries; ++i) {
results.push_back(transport.query(makeSlice(QUERY)));
}
for (auto& result : results) {
auto r = result.get();
EXPECT_EQ(DnsTlsTransport::Response::success, r.code);
EXPECT_EQ(QUERY, r.response);
}
EXPECT_EQ(transport.getConnectCounter(), 1);
}
// A server that waits until sDelay queries are queued before responding.
class FakeSocketDelay : public IDnsTlsSocket {
public:
explicit FakeSocketDelay(IDnsTlsSocketObserver* observer) : mObserver(observer) {}
~FakeSocketDelay() {
std::lock_guard guard(mLock);
sDelay = 1;
sReverse = false;
sConnectable = true;
}
inline static size_t sDelay = 1;
inline static bool sReverse = false;
inline static bool sConnectable = true;
bool query(uint16_t id, const Slice query) override {
LOG(DEBUG) << "FakeSocketDelay got query with ID " << int(id);
std::lock_guard guard(mLock);
// Check for duplicate IDs.
EXPECT_EQ(0U, mIds.count(id));
mIds.insert(id);
// Store response.
mResponses.push_back(make_echo(id, query));
LOG(DEBUG) << "Up to " << mResponses.size() << " out of " << sDelay << " queries";
if (mResponses.size() == sDelay) {
std::thread(&FakeSocketDelay::sendResponses, this).detach();
}
return true;
}
bool startHandshake() override { return sConnectable; }
private:
void sendResponses() {
std::lock_guard guard(mLock);
if (sReverse) {
std::reverse(std::begin(mResponses), std::end(mResponses));
}
for (auto& response : mResponses) {
mObserver->onResponse(response);
}
mIds.clear();
mResponses.clear();
}
std::mutex mLock;
IDnsTlsSocketObserver* const mObserver;
std::set<uint16_t> mIds GUARDED_BY(mLock);
std::vector<bytevec> mResponses GUARDED_BY(mLock);
};
TEST_F(TransportTest, ParallelColliding) {
FakeSocketDelay::sDelay = 10;
FakeSocketDelay::sReverse = false;
FakeSocketFactory<FakeSocketDelay> factory;
DnsTlsTransport transport(SERVER1, MARK, &factory);
std::vector<std::future<DnsTlsTransport::Result>> results;
// Fewer than 65536 queries to avoid ID exhaustion.
results.reserve(FakeSocketDelay::sDelay);
for (size_t i = 0; i < FakeSocketDelay::sDelay; ++i) {
results.push_back(transport.query(makeSlice(QUERY)));
}
for (auto& result : results) {
auto r = result.get();
EXPECT_EQ(DnsTlsTransport::Response::success, r.code);
EXPECT_EQ(QUERY, r.response);
}
EXPECT_EQ(transport.getConnectCounter(), 1);
}
TEST_F(TransportTest, ParallelColliding_Max) {
FakeSocketDelay::sDelay = 65536;
FakeSocketDelay::sReverse = false;
FakeSocketFactory<FakeSocketDelay> factory;
DnsTlsTransport transport(SERVER1, MARK, &factory);
std::vector<std::future<DnsTlsTransport::Result>> results;
// Exactly 65536 queries should still be possible in parallel,
// even if they all have the same original ID.
results.reserve(FakeSocketDelay::sDelay);
for (size_t i = 0; i < FakeSocketDelay::sDelay; ++i) {
results.push_back(transport.query(makeSlice(QUERY)));
}
for (auto& result : results) {
auto r = result.get();
EXPECT_EQ(DnsTlsTransport::Response::success, r.code);
EXPECT_EQ(QUERY, r.response);
}
EXPECT_EQ(transport.getConnectCounter(), 1);
}
TEST_F(TransportTest, ParallelUnique) {
FakeSocketDelay::sDelay = 10;
FakeSocketDelay::sReverse = false;
FakeSocketFactory<FakeSocketDelay> factory;
DnsTlsTransport transport(SERVER1, MARK, &factory);
std::vector<bytevec> queries(FakeSocketDelay::sDelay);
std::vector<std::future<DnsTlsTransport::Result>> results;
results.reserve(FakeSocketDelay::sDelay);
for (size_t i = 0; i < FakeSocketDelay::sDelay; ++i) {
queries[i] = make_query(i, SIZE);
results.push_back(transport.query(makeSlice(queries[i])));
}
for (size_t i = 0 ; i < FakeSocketDelay::sDelay; ++i) {
auto r = results[i].get();
EXPECT_EQ(DnsTlsTransport::Response::success, r.code);
EXPECT_EQ(queries[i], r.response);
}
EXPECT_EQ(transport.getConnectCounter(), 1);
}
TEST_F(TransportTest, ParallelUnique_Max) {
FakeSocketDelay::sDelay = 65536;
FakeSocketDelay::sReverse = false;
FakeSocketFactory<FakeSocketDelay> factory;
DnsTlsTransport transport(SERVER1, MARK, &factory);
std::vector<bytevec> queries(FakeSocketDelay::sDelay);
std::vector<std::future<DnsTlsTransport::Result>> results;
// Exactly 65536 queries should still be possible in parallel,
// and they should all be mapped correctly back to the original ID.
results.reserve(FakeSocketDelay::sDelay);
for (size_t i = 0; i < FakeSocketDelay::sDelay; ++i) {
queries[i] = make_query(i, SIZE);
results.push_back(transport.query(makeSlice(queries[i])));
}
for (size_t i = 0 ; i < FakeSocketDelay::sDelay; ++i) {
auto r = results[i].get();
EXPECT_EQ(DnsTlsTransport::Response::success, r.code);
EXPECT_EQ(queries[i], r.response);
}
EXPECT_EQ(transport.getConnectCounter(), 1);
}
TEST_F(TransportTest, IdExhaustion) {
const int num_queries = 65536;
// A delay of 65537 is unreachable, because the maximum number
// of outstanding queries is 65536.
FakeSocketDelay::sDelay = num_queries + 1;
FakeSocketDelay::sReverse = false;
FakeSocketFactory<FakeSocketDelay> factory;
DnsTlsTransport transport(SERVER1, MARK, &factory);
std::vector<std::future<DnsTlsTransport::Result>> results;
// Issue the maximum number of queries.
results.reserve(num_queries);
for (int i = 0; i < num_queries; ++i) {
results.push_back(transport.query(makeSlice(QUERY)));
}
// The ID space is now full, so subsequent queries should fail immediately.
auto r = transport.query(makeSlice(QUERY)).get();
EXPECT_EQ(DnsTlsTransport::Response::internal_error, r.code);
EXPECT_TRUE(r.response.empty());
for (auto& result : results) {
// All other queries should remain outstanding.
EXPECT_EQ(std::future_status::timeout,
result.wait_for(std::chrono::duration<int>::zero()));
}
EXPECT_EQ(transport.getConnectCounter(), 1);
}
// Responses can come back from the server in any order. This should have no
// effect on Transport's observed behavior.
TEST_F(TransportTest, ReverseOrder) {
FakeSocketDelay::sDelay = 10;
FakeSocketDelay::sReverse = true;
FakeSocketFactory<FakeSocketDelay> factory;
DnsTlsTransport transport(SERVER1, MARK, &factory);
std::vector<bytevec> queries(FakeSocketDelay::sDelay);
std::vector<std::future<DnsTlsTransport::Result>> results;
results.reserve(FakeSocketDelay::sDelay);
for (size_t i = 0; i < FakeSocketDelay::sDelay; ++i) {
queries[i] = make_query(i, SIZE);
results.push_back(transport.query(makeSlice(queries[i])));
}
for (size_t i = 0 ; i < FakeSocketDelay::sDelay; ++i) {
auto r = results[i].get();
EXPECT_EQ(DnsTlsTransport::Response::success, r.code);
EXPECT_EQ(queries[i], r.response);
}
EXPECT_EQ(transport.getConnectCounter(), 1);
}
TEST_F(TransportTest, ReverseOrder_Max) {
FakeSocketDelay::sDelay = 65536;
FakeSocketDelay::sReverse = true;
FakeSocketFactory<FakeSocketDelay> factory;
DnsTlsTransport transport(SERVER1, MARK, &factory);
std::vector<bytevec> queries(FakeSocketDelay::sDelay);
std::vector<std::future<DnsTlsTransport::Result>> results;
results.reserve(FakeSocketDelay::sDelay);
for (size_t i = 0; i < FakeSocketDelay::sDelay; ++i) {
queries[i] = make_query(i, SIZE);
results.push_back(transport.query(makeSlice(queries[i])));
}
for (size_t i = 0 ; i < FakeSocketDelay::sDelay; ++i) {
auto r = results[i].get();
EXPECT_EQ(DnsTlsTransport::Response::success, r.code);
EXPECT_EQ(queries[i], r.response);
}
EXPECT_EQ(transport.getConnectCounter(), 1);
}
// Returning null from the factory indicates a connection failure.
class NullSocketFactory : public IDnsTlsSocketFactory {
public:
NullSocketFactory() {}
std::unique_ptr<IDnsTlsSocket> createDnsTlsSocket(
const DnsTlsServer& server ATTRIBUTE_UNUSED,
unsigned mark ATTRIBUTE_UNUSED,
IDnsTlsSocketObserver* observer ATTRIBUTE_UNUSED,
DnsTlsSessionCache* cache ATTRIBUTE_UNUSED) override {
return nullptr;
}
};
TEST_F(TransportTest, ConnectFail) {
// Failure on creating socket.
NullSocketFactory factory1;
DnsTlsTransport transport1(SERVER1, MARK, &factory1);
auto r = transport1.query(makeSlice(QUERY)).get();
EXPECT_EQ(DnsTlsTransport::Response::network_error, r.code);
EXPECT_TRUE(r.response.empty());
EXPECT_EQ(transport1.getConnectCounter(), 1);
// Failure on handshaking.
FakeSocketDelay::sConnectable = false;
FakeSocketFactory<FakeSocketDelay> factory2;
DnsTlsTransport transport2(SERVER1, MARK, &factory2);
r = transport2.query(makeSlice(QUERY)).get();
EXPECT_EQ(DnsTlsTransport::Response::network_error, r.code);
EXPECT_TRUE(r.response.empty());
EXPECT_EQ(transport2.getConnectCounter(), 1);
}
// Simulate a socket that connects but then immediately receives a server
// close notification.
class FakeSocketClose : public IDnsTlsSocket {
public:
explicit FakeSocketClose(IDnsTlsSocketObserver* observer)
: mCloser(&IDnsTlsSocketObserver::onClosed, observer) {}
~FakeSocketClose() { mCloser.join(); }
bool query(uint16_t id ATTRIBUTE_UNUSED,
const Slice query ATTRIBUTE_UNUSED) override {
return true;
}
bool startHandshake() override { return true; }
private:
std::thread mCloser;
};
TEST_F(TransportTest, CloseRetryFail) {
FakeSocketFactory<FakeSocketClose> factory;
DnsTlsTransport transport(SERVER1, MARK, &factory);
auto r = transport.query(makeSlice(QUERY)).get();
EXPECT_EQ(DnsTlsTransport::Response::network_error, r.code);
EXPECT_TRUE(r.response.empty());
// Reconnections might be triggered depending on the flag.
EXPECT_EQ(transport.getConnectCounter(),
Experiments::getInstance()->getFlag(DOT_MAXTRIES_FLAG, DnsTlsQueryMap::kMaxTries));
}
// Simulate a server that occasionally closes the connection and silently
// drops some queries.
class FakeSocketLimited : public IDnsTlsSocket {
public:
static int sLimit; // Number of queries to answer per socket.
static size_t sMaxSize; // Silently discard queries greater than this size.
explicit FakeSocketLimited(IDnsTlsSocketObserver* observer)
: mObserver(observer), mQueries(0) {}
~FakeSocketLimited() {
{
LOG(DEBUG) << "~FakeSocketLimited acquiring mLock";
std::lock_guard guard(mLock);
LOG(DEBUG) << "~FakeSocketLimited acquired mLock";
for (auto& thread : mThreads) {
LOG(DEBUG) << "~FakeSocketLimited joining response thread";
thread.join();
LOG(DEBUG) << "~FakeSocketLimited joined response thread";
}
mThreads.clear();
}
if (mCloser) {
LOG(DEBUG) << "~FakeSocketLimited joining closer thread";
mCloser->join();
LOG(DEBUG) << "~FakeSocketLimited joined closer thread";
}
}
bool query(uint16_t id, const Slice query) override {
LOG(DEBUG) << "FakeSocketLimited::query acquiring mLock";
std::lock_guard guard(mLock);
LOG(DEBUG) << "FakeSocketLimited::query acquired mLock";
++mQueries;
if (mQueries <= sLimit) {
LOG(DEBUG) << "size " << query.size() << " vs. limit of " << sMaxSize;
if (query.size() <= sMaxSize) {
// Return the response immediately (asynchronously).
mThreads.emplace_back(&IDnsTlsSocketObserver::onResponse, mObserver, make_echo(id, query));
}
}
if (mQueries == sLimit) {
mCloser = std::make_unique<std::thread>(&FakeSocketLimited::sendClose, this);
}
return mQueries <= sLimit;
}
bool startHandshake() override { return true; }
private:
void sendClose() {
{
LOG(DEBUG) << "FakeSocketLimited::sendClose acquiring mLock";
std::lock_guard guard(mLock);
LOG(DEBUG) << "FakeSocketLimited::sendClose acquired mLock";
for (auto& thread : mThreads) {
LOG(DEBUG) << "FakeSocketLimited::sendClose joining response thread";
thread.join();
LOG(DEBUG) << "FakeSocketLimited::sendClose joined response thread";
}
mThreads.clear();
}
mObserver->onClosed();
}
std::mutex mLock;
IDnsTlsSocketObserver* const mObserver;
int mQueries GUARDED_BY(mLock);
std::vector<std::thread> mThreads GUARDED_BY(mLock);
std::unique_ptr<std::thread> mCloser GUARDED_BY(mLock);
};
int FakeSocketLimited::sLimit;
size_t FakeSocketLimited::sMaxSize;
TEST_F(TransportTest, SilentDrop) {
FakeSocketLimited::sLimit = 10; // Close the socket after 10 queries.
FakeSocketLimited::sMaxSize = 0; // Silently drop all queries
FakeSocketFactory<FakeSocketLimited> factory;
DnsTlsTransport transport(SERVER1, MARK, &factory);
// Queue up 10 queries. They will all be ignored, and after the 10th,
// the socket will close. Transport will retry them all, until they
// all hit the retry limit and expire.
std::vector<std::future<DnsTlsTransport::Result>> results;
results.reserve(FakeSocketLimited::sLimit);
for (int i = 0; i < FakeSocketLimited::sLimit; ++i) {
results.push_back(transport.query(makeSlice(QUERY)));
}
for (auto& result : results) {
auto r = result.get();
EXPECT_EQ(DnsTlsTransport::Response::network_error, r.code);
EXPECT_TRUE(r.response.empty());
}
// Reconnections might be triggered depending on the flag.
EXPECT_EQ(transport.getConnectCounter(),
Experiments::getInstance()->getFlag(DOT_MAXTRIES_FLAG, DnsTlsQueryMap::kMaxTries));
}
TEST_F(TransportTest, PartialDrop) {
FakeSocketLimited::sLimit = 10; // Close the socket after 10 queries.
FakeSocketLimited::sMaxSize = SIZE - 2; // Silently drop "long" queries
FakeSocketFactory<FakeSocketLimited> factory;
DnsTlsTransport transport(SERVER1, MARK, &factory);
// Queue up 100 queries, alternating "short" which will be served and "long"
// which will be dropped.
const int num_queries = 10 * FakeSocketLimited::sLimit;
std::vector<bytevec> queries(num_queries);
std::vector<std::future<DnsTlsTransport::Result>> results;
results.reserve(num_queries);
for (int i = 0; i < num_queries; ++i) {
queries[i] = make_query(i, SIZE + (i % 2));
results.push_back(transport.query(makeSlice(queries[i])));
}
// Just check the short queries, which are at the even indices.
for (int i = 0; i < num_queries; i += 2) {
auto r = results[i].get();
EXPECT_EQ(DnsTlsTransport::Response::success, r.code);
EXPECT_EQ(queries[i], r.response);
}
// TODO: transport.getConnectCounter() seems not stable in this test. Find how to check the
// connect attempts for this test.
}
TEST_F(TransportTest, ConnectCounter) {
FakeSocketLimited::sLimit = 2; // Close the socket after 2 queries.
FakeSocketLimited::sMaxSize = SIZE; // No query drops.
FakeSocketFactory<FakeSocketLimited> factory;
DnsTlsTransport transport(SERVER1, MARK, &factory);
// Connecting on demand.
EXPECT_EQ(transport.getConnectCounter(), 0);
const int num_queries = 10;
std::vector<std::future<DnsTlsTransport::Result>> results;
results.reserve(num_queries);
for (int i = 0; i < num_queries; i++) {
// Reconnections take place every two queries.
results.push_back(transport.query(makeSlice(QUERY)));
}
for (int i = 0; i < num_queries; i++) {
auto r = results[i].get();
EXPECT_EQ(DnsTlsTransport::Response::success, r.code);
}
EXPECT_EQ(transport.getConnectCounter(), num_queries / FakeSocketLimited::sLimit);
}
// Simulate a malfunctioning server that injects extra miscellaneous
// responses to queries that were not asked. This will cause wrong answers but
// must not crash the Transport.
class FakeSocketGarbage : public IDnsTlsSocket {
public:
explicit FakeSocketGarbage(IDnsTlsSocketObserver* observer) : mObserver(observer) {
// Inject a garbage event.
mThreads.emplace_back(&IDnsTlsSocketObserver::onResponse, mObserver, make_query(ID + 1, SIZE));
}
~FakeSocketGarbage() {
std::lock_guard guard(mLock);
for (auto& thread : mThreads) {
thread.join();
}
}
bool query(uint16_t id, const Slice query) override {
std::lock_guard guard(mLock);
// Return the response twice.
auto echo = make_echo(id, query);
mThreads.emplace_back(&IDnsTlsSocketObserver::onResponse, mObserver, echo);
mThreads.emplace_back(&IDnsTlsSocketObserver::onResponse, mObserver, echo);
// Also return some other garbage
mThreads.emplace_back(&IDnsTlsSocketObserver::onResponse, mObserver, make_query(id + 1, query.size() + 2));
return true;
}
bool startHandshake() override { return true; }
private:
std::mutex mLock;
std::vector<std::thread> mThreads GUARDED_BY(mLock);
IDnsTlsSocketObserver* const mObserver;
};
TEST_F(TransportTest, IgnoringGarbage) {
FakeSocketFactory<FakeSocketGarbage> factory;
DnsTlsTransport transport(SERVER1, MARK, &factory);
for (int i = 0; i < 10; ++i) {
auto r = transport.query(makeSlice(QUERY)).get();
EXPECT_EQ(DnsTlsTransport::Response::success, r.code);
// Don't check the response because this server is malfunctioning.
}
EXPECT_EQ(transport.getConnectCounter(), 1);
}
// Dispatcher tests
class DispatcherTest : public BaseTest {};
TEST_F(DispatcherTest, Query) {
bytevec ans(4096);
int resplen = 0;
bool connectTriggered = false;
auto factory = std::make_unique<FakeSocketFactory<FakeSocketEcho>>();
DnsTlsDispatcher dispatcher(std::move(factory));
auto r = dispatcher.query(SERVER1, NETID, MARK, makeSlice(QUERY), makeSlice(ans), &resplen,
&connectTriggered);
EXPECT_EQ(DnsTlsTransport::Response::success, r);
EXPECT_EQ(int(QUERY.size()), resplen);
EXPECT_TRUE(connectTriggered);
ans.resize(resplen);
EXPECT_EQ(QUERY, ans);
// Expect to reuse the connection.
r = dispatcher.query(SERVER1, NETID, MARK, makeSlice(QUERY), makeSlice(ans), &resplen,
&connectTriggered);
EXPECT_EQ(DnsTlsTransport::Response::success, r);
EXPECT_FALSE(connectTriggered);
}
TEST_F(DispatcherTest, AnswerTooLarge) {
bytevec ans(SIZE - 1); // Too small to hold the answer
int resplen = 0;
bool connectTriggered = false;
auto factory = std::make_unique<FakeSocketFactory<FakeSocketEcho>>();
DnsTlsDispatcher dispatcher(std::move(factory));
auto r = dispatcher.query(SERVER1, NETID, MARK, makeSlice(QUERY), makeSlice(ans), &resplen,
&connectTriggered);
EXPECT_EQ(DnsTlsTransport::Response::limit_error, r);
EXPECT_TRUE(connectTriggered);
}
template<class T>
class TrackingFakeSocketFactory : public IDnsTlsSocketFactory {
public:
TrackingFakeSocketFactory() {}
std::unique_ptr<IDnsTlsSocket> createDnsTlsSocket(
const DnsTlsServer& server,
unsigned mark,
IDnsTlsSocketObserver* observer,
DnsTlsSessionCache* cache ATTRIBUTE_UNUSED) override {
std::lock_guard guard(mLock);
keys.emplace(mark, server);
return std::make_unique<T>(observer);
}
std::multiset<std::pair<unsigned, DnsTlsServer>> keys;
private:
std::mutex mLock;
};
TEST_F(DispatcherTest, Dispatching) {
FakeSocketDelay::sDelay = 5;
FakeSocketDelay::sReverse = true;
auto factory = std::make_unique<TrackingFakeSocketFactory<FakeSocketDelay>>();
auto* weak_factory = factory.get(); // Valid as long as dispatcher is in scope.
DnsTlsDispatcher dispatcher(std::move(factory));
// Populate a vector of two servers and two socket marks, four combinations
// in total.
std::vector<std::pair<unsigned, DnsTlsServer>> keys;
keys.emplace_back(MARK, SERVER1);
keys.emplace_back(MARK + 1, SERVER1);
keys.emplace_back(MARK, V4ADDR2);
keys.emplace_back(MARK + 1, V4ADDR2);
// Do several queries on each server. They should all succeed.
std::vector<std::thread> threads;
for (size_t i = 0; i < FakeSocketDelay::sDelay * keys.size(); ++i) {
auto key = keys[i % keys.size()];
threads.emplace_back([key, i] (DnsTlsDispatcher* dispatcher) {
auto q = make_query(i, SIZE);
bytevec ans(4096);
int resplen = 0;
bool connectTriggered = false;
unsigned mark = key.first;
unsigned netId = key.first;
const DnsTlsServer& server = key.second;
auto r = dispatcher->query(server, netId, mark, makeSlice(q), makeSlice(ans), &resplen,
&connectTriggered);
EXPECT_EQ(DnsTlsTransport::Response::success, r);
EXPECT_EQ(int(q.size()), resplen);
ans.resize(resplen);
EXPECT_EQ(q, ans);
}, &dispatcher);
}
for (auto& thread : threads) {
thread.join();
}
// We expect that the factory created one socket for each key.
EXPECT_EQ(keys.size(), weak_factory->keys.size());
for (auto& key : keys) {
EXPECT_EQ(1U, weak_factory->keys.count(key));
}
}
// Check DnsTlsServer's comparison logic.
AddressComparator ADDRESS_COMPARATOR;
bool isAddressEqual(const DnsTlsServer& s1, const DnsTlsServer& s2) {
bool cmp1 = ADDRESS_COMPARATOR(s1, s2);
bool cmp2 = ADDRESS_COMPARATOR(s2, s1);
EXPECT_FALSE(cmp1 && cmp2);
return !cmp1 && !cmp2;
}
void checkUnequal(const DnsTlsServer& s1, const DnsTlsServer& s2) {
EXPECT_TRUE(s1 == s1);
EXPECT_TRUE(s2 == s2);
EXPECT_TRUE(isAddressEqual(s1, s1));
EXPECT_TRUE(isAddressEqual(s2, s2));
EXPECT_TRUE(s1 < s2 ^ s2 < s1);
EXPECT_FALSE(s1 == s2);
EXPECT_FALSE(s2 == s1);
}
void checkEqual(const DnsTlsServer& s1, const DnsTlsServer& s2) {
EXPECT_TRUE(s1 == s1);
EXPECT_TRUE(s2 == s2);
EXPECT_TRUE(isAddressEqual(s1, s1));
EXPECT_TRUE(isAddressEqual(s2, s2));
EXPECT_FALSE(s1 < s2);
EXPECT_FALSE(s2 < s1);
EXPECT_TRUE(s1 == s2);
EXPECT_TRUE(s2 == s1);
}
class ServerTest : public BaseTest {};
TEST_F(ServerTest, IPv4) {
checkUnequal(DnsTlsServer(V4ADDR1), DnsTlsServer(V4ADDR2));
EXPECT_FALSE(isAddressEqual(DnsTlsServer(V4ADDR1), DnsTlsServer(V4ADDR2)));
}
TEST_F(ServerTest, IPv6) {
checkUnequal(DnsTlsServer(V6ADDR1), DnsTlsServer(V6ADDR2));
EXPECT_FALSE(isAddressEqual(DnsTlsServer(V6ADDR1), DnsTlsServer(V6ADDR2)));
}
TEST_F(ServerTest, MixedAddressFamily) {
checkUnequal(DnsTlsServer(V6ADDR1), DnsTlsServer(V4ADDR1));
EXPECT_FALSE(isAddressEqual(DnsTlsServer(V6ADDR1), DnsTlsServer(V4ADDR1)));
}
TEST_F(ServerTest, IPv6ScopeId) {
DnsTlsServer s1(IPAddress::forString("fe80::1%1"));
DnsTlsServer s2(IPAddress::forString("fe80::1%2"));
checkUnequal(s1, s2);
EXPECT_FALSE(isAddressEqual(s1, s2));
EXPECT_FALSE(s1.wasExplicitlyConfigured());
EXPECT_FALSE(s2.wasExplicitlyConfigured());
}
TEST_F(ServerTest, Port) {
DnsTlsServer s1(IPSockAddr::toIPSockAddr("192.0.2.1", 853));
DnsTlsServer s2(IPSockAddr::toIPSockAddr("192.0.2.1", 854));
checkUnequal(s1, s2);
EXPECT_TRUE(isAddressEqual(s1, s2));
EXPECT_EQ(s1.toIpString(), "192.0.2.1");
EXPECT_EQ(s2.toIpString(), "192.0.2.1");
DnsTlsServer s3(IPSockAddr::toIPSockAddr("2001:db8::1", 853));
DnsTlsServer s4(IPSockAddr::toIPSockAddr("2001:db8::1", 854));
checkUnequal(s3, s4);
EXPECT_TRUE(isAddressEqual(s3, s4));
EXPECT_EQ(s3.toIpString(), "2001:db8::1");
EXPECT_EQ(s4.toIpString(), "2001:db8::1");
EXPECT_FALSE(s1.wasExplicitlyConfigured());
EXPECT_FALSE(s2.wasExplicitlyConfigured());
}
TEST_F(ServerTest, Name) {
DnsTlsServer s1(V4ADDR1), s2(V4ADDR1);
s1.name = SERVERNAME1;
checkUnequal(s1, s2);
s2.name = SERVERNAME2;
checkUnequal(s1, s2);
EXPECT_TRUE(isAddressEqual(s1, s2));
EXPECT_TRUE(s1.wasExplicitlyConfigured());
EXPECT_TRUE(s2.wasExplicitlyConfigured());
}
TEST_F(ServerTest, State) {
DnsTlsServer s1(V4ADDR1), s2(V4ADDR1);
checkEqual(s1, s2);
s1.setValidationState(Validation::success);
checkEqual(s1, s2);
s2.setValidationState(Validation::fail);
checkEqual(s1, s2);
s1.setActive(true);
checkEqual(s1, s2);
s2.setActive(false);
checkEqual(s1, s2);
EXPECT_EQ(s1.validationState(), Validation::success);
EXPECT_EQ(s2.validationState(), Validation::fail);
EXPECT_TRUE(s1.active());
EXPECT_FALSE(s2.active());
}
TEST(QueryMapTest, Basic) {
DnsTlsQueryMap map;
EXPECT_TRUE(map.empty());
bytevec q0 = make_query(999, SIZE);
bytevec q1 = make_query(888, SIZE);
bytevec q2 = make_query(777, SIZE);
auto f0 = map.recordQuery(makeSlice(q0));
auto f1 = map.recordQuery(makeSlice(q1));
auto f2 = map.recordQuery(makeSlice(q2));
// Check return values of recordQuery
EXPECT_EQ(0, f0->query.newId);
EXPECT_EQ(1, f1->query.newId);
EXPECT_EQ(2, f2->query.newId);
// Check side effects of recordQuery
EXPECT_FALSE(map.empty());
auto all = map.getAll();
EXPECT_EQ(3U, all.size());
EXPECT_EQ(0, all[0].newId);
EXPECT_EQ(1, all[1].newId);
EXPECT_EQ(2, all[2].newId);
EXPECT_EQ(q0, all[0].query);
EXPECT_EQ(q1, all[1].query);
EXPECT_EQ(q2, all[2].query);
bytevec a0 = make_query(0, SIZE);
bytevec a1 = make_query(1, SIZE);
bytevec a2 = make_query(2, SIZE);
// Return responses out of order
map.onResponse(a2);
map.onResponse(a0);
map.onResponse(a1);
EXPECT_TRUE(map.empty());
auto r0 = f0->result.get();
auto r1 = f1->result.get();
auto r2 = f2->result.get();
EXPECT_EQ(DnsTlsQueryMap::Response::success, r0.code);
EXPECT_EQ(DnsTlsQueryMap::Response::success, r1.code);
EXPECT_EQ(DnsTlsQueryMap::Response::success, r2.code);
const bytevec& d0 = r0.response;
const bytevec& d1 = r1.response;
const bytevec& d2 = r2.response;
// The ID should match the query
EXPECT_EQ(999, d0[0] << 8 | d0[1]);
EXPECT_EQ(888, d1[0] << 8 | d1[1]);
EXPECT_EQ(777, d2[0] << 8 | d2[1]);
// The body should match the answer
EXPECT_EQ(bytevec(a0.begin() + 2, a0.end()), bytevec(d0.begin() + 2, d0.end()));
EXPECT_EQ(bytevec(a1.begin() + 2, a1.end()), bytevec(d1.begin() + 2, d1.end()));
EXPECT_EQ(bytevec(a2.begin() + 2, a2.end()), bytevec(d2.begin() + 2, d2.end()));
}
TEST(QueryMapTest, FillHole) {
DnsTlsQueryMap map;
std::vector<std::unique_ptr<DnsTlsQueryMap::QueryFuture>> futures(UINT16_MAX + 1);
for (uint32_t i = 0; i <= UINT16_MAX; ++i) {
futures[i] = map.recordQuery(makeSlice(QUERY));
ASSERT_TRUE(futures[i]); // answers[i] should be nonnull.
EXPECT_EQ(i, futures[i]->query.newId);
}
// The map should now be full.
EXPECT_EQ(size_t(UINT16_MAX + 1), map.getAll().size());
// Trying to add another query should fail because the map is full.
EXPECT_FALSE(map.recordQuery(makeSlice(QUERY)));
// Send an answer to query 40000
auto answer = make_query(40000, SIZE);
map.onResponse(answer);
auto result = futures[40000]->result.get();
EXPECT_EQ(DnsTlsQueryMap::Response::success, result.code);
EXPECT_EQ(ID, result.response[0] << 8 | result.response[1]);
EXPECT_EQ(bytevec(answer.begin() + 2, answer.end()),
bytevec(result.response.begin() + 2, result.response.end()));
// There should now be room in the map.
EXPECT_EQ(size_t(UINT16_MAX), map.getAll().size());
auto f = map.recordQuery(makeSlice(QUERY));
ASSERT_TRUE(f);
EXPECT_EQ(40000, f->query.newId);
// The map should now be full again.
EXPECT_EQ(size_t(UINT16_MAX + 1), map.getAll().size());
EXPECT_FALSE(map.recordQuery(makeSlice(QUERY)));
}
class DnsTlsSocketTest : public ResolvTestBase {
protected:
class MockDnsTlsSocketObserver : public IDnsTlsSocketObserver {
public:
MOCK_METHOD(void, onClosed, (), (override));
MOCK_METHOD(void, onResponse, (std::vector<uint8_t>), (override));
};
std::unique_ptr<DnsTlsSocket> makeDnsTlsSocket(IDnsTlsSocketObserver* observer) {
return std::make_unique<DnsTlsSocket>(this->server, MARK, observer, &this->cache);
}
void enableAsyncHandshake(const std::unique_ptr<DnsTlsSocket>& socket) {
ASSERT_TRUE(socket);
DnsTlsSocket* delegate = socket.get();
std::lock_guard guard(delegate->mLock);
delegate->mAsyncHandshake = true;
}
static constexpr char kTlsAddr[] = "127.0.0.3";
static constexpr char kTlsPort[] = "8530"; // High-numbered port so root isn't required.
static constexpr char kBackendAddr[] = "192.0.2.1";
static constexpr char kBackendPort[] = "8531"; // High-numbered port so root isn't required.
test::DnsTlsFrontend tls{kTlsAddr, kTlsPort, kBackendAddr, kBackendPort};
const DnsTlsServer server{IPSockAddr::toIPSockAddr(kTlsAddr, std::stoi(kTlsPort))};
DnsTlsSessionCache cache;
};
TEST_F(DnsTlsSocketTest, SlowDestructor) {
ASSERT_TRUE(tls.startServer());
MockDnsTlsSocketObserver observer;
auto socket = makeDnsTlsSocket(&observer);
ASSERT_TRUE(socket->initialize());
ASSERT_TRUE(socket->startHandshake());
// Test: Time the socket destructor. This should be fast.
auto before = std::chrono::steady_clock::now();
EXPECT_CALL(observer, onClosed);
socket.reset();
auto after = std::chrono::steady_clock::now();
auto delay = after - before;
LOG(DEBUG) << "Shutdown took " << delay / std::chrono::nanoseconds{1} << "ns";
// Shutdown should complete in milliseconds, but if the shutdown signal is lost
// it will wait for the timeout, which is expected to take 20seconds.
EXPECT_LT(delay, std::chrono::seconds{5});
}
TEST_F(DnsTlsSocketTest, StartHandshake) {
ASSERT_TRUE(tls.startServer());
MockDnsTlsSocketObserver observer;
auto socket = makeDnsTlsSocket(&observer);
// Call the function before the call to initialize().
EXPECT_FALSE(socket->startHandshake());
// Call the function after the call to initialize().
EXPECT_TRUE(socket->initialize());
EXPECT_TRUE(socket->startHandshake());
// Call both of them again.
EXPECT_FALSE(socket->initialize());
EXPECT_FALSE(socket->startHandshake());
// Should happen when joining the loop thread in |socket| destruction.
EXPECT_CALL(observer, onClosed);
}
TEST_F(DnsTlsSocketTest, ShutdownSignal) {
ASSERT_TRUE(tls.startServer());
MockDnsTlsSocketObserver observer;
std::unique_ptr<DnsTlsSocket> socket;
const auto setupAndStartHandshake = [&]() {
socket = makeDnsTlsSocket(&observer);
EXPECT_TRUE(socket->initialize());
enableAsyncHandshake(socket);
EXPECT_TRUE(socket->startHandshake());
};
const auto triggerShutdown = [&](const std::string& traceLog) {
SCOPED_TRACE(traceLog);
auto before = std::chrono::steady_clock::now();
EXPECT_CALL(observer, onClosed);
socket.reset();
auto after = std::chrono::steady_clock::now();
auto delay = after - before;
LOG(INFO) << "Shutdown took " << delay / std::chrono::nanoseconds{1} << "ns";
EXPECT_LT(delay, std::chrono::seconds{1});
};
tls.setHangOnHandshakeForTesting(true);
// Test 1: Reset the DnsTlsSocket which is doing the handshake.
setupAndStartHandshake();
triggerShutdown("Shutdown handshake w/o query requests");
// Test 2: Reset the DnsTlsSocket which is doing the handshake with some query requests.
setupAndStartHandshake();
// DnsTlsSocket doesn't report the status of pending queries. The decision whether to mark
// a query request as failed or not is made in DnsTlsTransport.
EXPECT_CALL(observer, onResponse).Times(0);
EXPECT_TRUE(socket->query(1, makeSlice(QUERY)));
EXPECT_TRUE(socket->query(2, makeSlice(QUERY)));
triggerShutdown("Shutdown handshake w/ query requests");
}
} // end of namespace net
} // end of namespace android
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