Merge changes I9262f65e,I5088d3c6,I47ab70aa,I262f9782 am: 6bcde8897a (02fd4ee6) · Commits · e / os / android_packages_modules_DnsResolver

DnsTlsSocket.cpp

+37 −8

Original line number	Diff line number	Diff line
		@@ -81,7 +81,7 @@ Status DnsTlsSocket::tcpConnect() {

		mSslFd.reset(socket(mServer.ss.ss_family, type, mServer.protocol));
		if (mSslFd.get() == -1) {
		LOG(ERROR) << "Failed to create socket";
		PLOG(ERROR) << "Failed to create socket";
		return Status(errno);
		}

		@@ -89,9 +89,10 @@ Status DnsTlsSocket::tcpConnect() {

		const socklen_t len = sizeof(mMark);
		if (setsockopt(mSslFd.get(), SOL_SOCKET, SO_MARK, &mMark, len) == -1) {
		LOG(ERROR) << "Failed to set socket mark";
		const int err = errno;
		PLOG(ERROR) << "Failed to set socket mark";
		mSslFd.reset();
		return Status(errno);
		return Status(err);
		}

		const Status tfo = enableSockopt(mSslFd.get(), SOL_TCP, TCP_FASTOPEN_CONNECT);
		@@ -105,9 +106,10 @@ Status DnsTlsSocket::tcpConnect() {
		if (connect(mSslFd.get(), reinterpret_cast<const struct sockaddr *>(&mServer.ss),
		sizeof(mServer.ss)) != 0 &&
		errno != EINPROGRESS) {
		LOG(DEBUG) << "Socket failed to connect";
		const int err = errno;
		PLOG(ERROR) << "Socket failed to connect";
		mSslFd.reset();
		return Status(errno);
		return Status(err);
		}

		return netdutils::status::ok;
		@@ -169,18 +171,33 @@ bool DnsTlsSocket::initialize() {
		// Enable session cache
		mCache->prepareSslContext(mSslCtx.get());

		mEventFd.reset(eventfd(0, EFD_NONBLOCK \| EFD_CLOEXEC));

		transitionState(State::UNINITIALIZED, State::INITIALIZED);

		return true;
		}

		bool DnsTlsSocket::startHandshake() {
		std::lock_guard guard(mLock);
		if (mState != State::INITIALIZED) {
		LOG(ERROR) << "Calling startHandshake in unexpected state " << static_cast<int>(mState);
		return false;
		}
		transitionState(State::INITIALIZED, State::CONNECTING);

		// Connect
		Status status = tcpConnect();
		if (!status.ok()) {
		transitionState(State::CONNECTING, State::WAIT_FOR_DELETE);
		return false;
		}
		mSsl = sslConnect(mSslFd.get());
		if (!mSsl) {
		transitionState(State::CONNECTING, State::WAIT_FOR_DELETE);
		return false;
		}

		mEventFd.reset(eventfd(0, EFD_NONBLOCK \| EFD_CLOEXEC));

		// Start the I/O loop.
		mLoopThread.reset(new std::thread(&DnsTlsSocket::loop, this));

		@@ -309,7 +326,9 @@ void DnsTlsSocket::loop() {
		std::deque<std::vector<uint8_t>> q;
		const int timeout_msecs = DnsTlsSocket::kIdleTimeout.count() * 1000;

		transitionState(State::CONNECTING, State::CONNECTED);
		setThreadName(StringPrintf("TlsListen_%u", mMark & 0xffff).c_str());

		while (true) {
		// poll() ignores negative fds
		struct pollfd fds[2] = { { .fd = -1 }, { .fd = -1 } };
		@@ -336,7 +355,7 @@ void DnsTlsSocket::loop() {
		break;
		}
		if (s < 0) {
		LOG(DEBUG) << "Poll failed: " << errno;
		PLOG(DEBUG) << "Poll failed";
		break;
		}
		if (fds[SSLFD].revents & (POLLIN \| POLLERR \| POLLHUP)) {
		@@ -379,6 +398,7 @@ void DnsTlsSocket::loop() {
		sslDisconnect();
		LOG(DEBUG) << "Calling onClosed";
		mObserver->onClosed();
		transitionState(State::CONNECTED, State::WAIT_FOR_DELETE);
		LOG(DEBUG) << "Ending loop";
		}

		@@ -441,6 +461,15 @@ bool DnsTlsSocket::incrementEventFd(const int64_t count) {
		return true;
		}

		void DnsTlsSocket::transitionState(State from, State to) {
		if (mState != from) {
		LOG(WARNING) << "BUG: transitioning from an unexpected state " << static_cast<int>(mState)
		<< ", expect: from " << static_cast<int>(from) << " to "
		<< static_cast<int>(to);
		}
		mState = to;
		}

		// Read exactly len bytes into buffer or fail with an SSL error code
		int DnsTlsSocket::sslRead(const Slice buffer, bool wait) {
		size_t remaining = buffer.size();

DnsTlsSocket.h

+40 −1

Original line number	Diff line number	Diff line
		@@ -44,18 +44,53 @@ class DnsTlsSessionCache;
		// or the destructor in a callback. Doing so will result in deadlocks.
		// This class may call the observer at any time after initialize(), until the destructor
		// returns (but not after).
		//
		// Calls to IDnsTlsSocketObserver in a DnsTlsSocket life cycle:
		//
		// UNINITIALIZED
		// \|
		// v
		// INITIALIZED
		// \|
		// v
		// +----CONNECTING------+
		// Handshake fails \| \| Handshake succeeds
		// \| \|
		// \| v
		// \| +---> CONNECTED --+
		// \| \| \| \|
		// \| +-----------+ \| Idle timeout
		// \| Send/Recv queries \| onClose()
		// \| onResponse() \|
		// \| \|
		// \| \|
		// +--> WAIT_FOR_DELETE <-----+
		//
		//
		// TODO: Add onHandshakeFinished() for handshake results.
		class DnsTlsSocket : public IDnsTlsSocket {
		public:
		enum class State {
		UNINITIALIZED,
		INITIALIZED,
		CONNECTING,
		CONNECTED,
		WAIT_FOR_DELETE,
		};

		DnsTlsSocket(const DnsTlsServer& server, unsigned mark,
		IDnsTlsSocketObserver* _Nonnull observer, DnsTlsSessionCache* _Nonnull cache)
		: mMark(mark), mServer(server), mObserver(observer), mCache(cache) {}
		~DnsTlsSocket();

		// Creates the SSL context for this session and connect. Returns false on failure.
		// Creates the SSL context for this session. Returns false on failure.
		// This method should be called after construction and before use of a DnsTlsSocket.
		// Only call this method once per DnsTlsSocket.
		bool initialize() EXCLUDES(mLock);

		// A blocking call to start handshaking until it finishes.
		bool startHandshake() EXCLUDES(mLock);

		// Send a query on the provided SSL socket. \|query\| contains
		// the body of a query, not including the ID header. This function will typically return before
		// the query is actually sent. If this function fails, DnsTlsSocketObserver will be
		@@ -112,6 +147,9 @@ class DnsTlsSocket : public IDnsTlsSocket {
		// the loop thread by incrementing mEventFd. loop() reads items off the queue.
		LockedQueue<std::vector<uint8_t>> mQueue;

		// Transition the state from expected state \|from\| to new state \|to\|.
		void transitionState(State from, State to) REQUIRES(mLock);

		// eventfd socket used for notifying the SSL thread when queries are ready to send.
		// This socket acts similarly to an atomic counter, incremented by query() and cleared
		// by loop(). We have to use a socket because the SSL thread needs to wait in poll()
		@@ -131,6 +169,7 @@ class DnsTlsSocket : public IDnsTlsSocket {
		const DnsTlsServer mServer;
		IDnsTlsSocketObserver* _Nonnull const mObserver;
		DnsTlsSessionCache* _Nonnull const mCache;
		State mState GUARDED_BY(mLock) = State::UNINITIALIZED;
		};

		} // end of namespace net

DnsTlsTransport.cpp

+6 −1

Original line number	Diff line number	Diff line
		@@ -70,9 +70,14 @@ bool DnsTlsTransport::sendQuery(const DnsTlsQueryMap::Query& q) {
		void DnsTlsTransport::doConnect() {
		LOG(DEBUG) << "Constructing new socket";
		mSocket = mFactory->createDnsTlsSocket(mServer, mMark, this, &mCache);

		bool success = true;
		if (mSocket.get() == nullptr \|\| !mSocket->startHandshake()) {
		success = false;
		}
		mConnectCounter++;

		if (mSocket) {
		if (success) {
		auto queries = mQueries.getAll();
		LOG(DEBUG) << "Initialization succeeded. Reissuing " << queries.size() << " queries.";
		for(auto& q : queries) {

IDnsTlsSocket.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -40,6 +40,8 @@ class IDnsTlsSocket {
		// notified that the socket is closed.
		// Note that a true return value indicates successful sending, not receipt of a response.
		virtual bool query(uint16_t id, const netdutils::Slice query) = 0;

		virtual bool startHandshake() = 0;
		};

		} // end of namespace net

resolv_tls_unit_test.cpp

+69 −19

Original line number	Diff line number	Diff line
		@@ -22,6 +22,7 @@

		#include <android-base/logging.h>
		#include <android-base/macros.h>
		#include <gmock/gmock.h>
		#include <gtest/gtest.h>
		#include <netdutils/Slice.h>

		@@ -39,8 +40,9 @@
		namespace android {
		namespace net {

		using netdutils::Slice;
		using netdutils::makeSlice;
		using netdutils::Slice;
		using ::testing::NiceMock;

		typedef std::vector<uint8_t> bytevec;

		@@ -134,6 +136,7 @@ class FakeSocketEcho : public IDnsTlsSocket {
		std::thread(&IDnsTlsSocketObserver::onResponse, mObserver, make_echo(id, query)).detach();
		return true;
		}
		bool startHandshake() override { return true; }

		private:
		IDnsTlsSocketObserver* const mObserver;
		@@ -169,6 +172,7 @@ class FakeSocketId : public IDnsTlsSocket {
		std::thread(&IDnsTlsSocketObserver::onResponse, mObserver, response).detach();
		return true;
		}
		bool startHandshake() override { return true; }

		private:
		IDnsTlsSocketObserver* const mObserver;
		@@ -216,9 +220,15 @@ TEST_F(TransportTest, RacingQueries_10000) {
		class FakeSocketDelay : public IDnsTlsSocket {
		public:
		explicit FakeSocketDelay(IDnsTlsSocketObserver* observer) : mObserver(observer) {}
		~FakeSocketDelay() { std::lock_guard guard(mLock); }
		static size_t sDelay;
		static bool sReverse;
		~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);
		@@ -236,6 +246,7 @@ class FakeSocketDelay : public IDnsTlsSocket {
		}
		return true;
		}
		bool startHandshake() override { return sConnectable; }

		private:
		void sendResponses() {
		@@ -256,9 +267,6 @@ class FakeSocketDelay : public IDnsTlsSocket {
		std::vector<bytevec> mResponses GUARDED_BY(mLock);
		};

		size_t FakeSocketDelay::sDelay;
		bool FakeSocketDelay::sReverse;

		TEST_F(TransportTest, ParallelColliding) {
		FakeSocketDelay::sDelay = 10;
		FakeSocketDelay::sReverse = false;
		@@ -424,13 +432,24 @@ class NullSocketFactory : public IDnsTlsSocketFactory {
		};

		TEST_F(TransportTest, ConnectFail) {
		NullSocketFactory factory;
		DnsTlsTransport transport(SERVER1, MARK, &factory);
		auto r = transport.query(makeSlice(QUERY)).get();
		// 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(transport.getConnectCounter(), 1);
		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
		@@ -444,6 +463,7 @@ class FakeSocketClose : public IDnsTlsSocket {
		const Slice query ATTRIBUTE_UNUSED) override {
		return true;
		}
		bool startHandshake() override { return true; }

		private:
		std::thread mCloser;
		@@ -506,6 +526,7 @@ class FakeSocketLimited : public IDnsTlsSocket {
		}
		return mQueries <= sLimit;
		}
		bool startHandshake() override { return true; }

		private:
		void sendClose() {
		@@ -632,6 +653,7 @@ class FakeSocketGarbage : public IDnsTlsSocket {
		mThreads.emplace_back(&IDnsTlsSocketObserver::onResponse, mObserver, make_query(id + 1, query.size() + 2));
		return true;
		}
		bool startHandshake() override { return true; }

		private:
		std::mutex mLock;
		@@ -959,12 +981,10 @@ TEST(QueryMapTest, FillHole) {
		EXPECT_FALSE(map.recordQuery(makeSlice(QUERY)));
		}

		class StubObserver : public IDnsTlsSocketObserver {
		class MockDnsTlsSocketObserver : public IDnsTlsSocketObserver {
		public:
		bool closed = false;
		void onResponse(std::vector<uint8_t>) override {}

		void onClosed() override { closed = true; }
		MOCK_METHOD(void, onClosed, (), (override));
		MOCK_METHOD(void, onResponse, (std::vector<uint8_t>), (override));
		};

		TEST(DnsTlsSocketTest, SlowDestructor) {
		@@ -980,23 +1000,53 @@ TEST(DnsTlsSocketTest, SlowDestructor) {
		DnsTlsServer server;
		parseServer(tls_addr, 8530, &server.ss);

		StubObserver observer;
		ASSERT_FALSE(observer.closed);
		MockDnsTlsSocketObserver observer;
		DnsTlsSessionCache cache;
		auto socket = std::make_unique<DnsTlsSocket>(server, MARK, &observer, &cache);
		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";
		EXPECT_TRUE(observer.closed);
		// 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(DnsTlsSocketTest, StartHandshake) {
		constexpr char tls_addr[] = "127.0.0.3";
		constexpr char tls_port[] = "8530";
		constexpr char backend_addr[] = "192.0.2.1";
		constexpr char backend_port[] = "1";

		test::DnsTlsFrontend tls(tls_addr, tls_port, backend_addr, backend_port);
		ASSERT_TRUE(tls.startServer());

		DnsTlsServer server;
		parseServer(tls_addr, 8530, &server.ss);

		// Use NiceMock to suppress the "uninteresting calls" warning.
		// (onClose will be called when running \|socket\|'s destructor)
		NiceMock<MockDnsTlsSocketObserver> observer;
		DnsTlsSessionCache cache;
		auto socket = std::make_unique<DnsTlsSocket>(server, MARK, &observer, &cache);

		// 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());
		}

		} // end of namespace net
		} // end of namespace android