Snap for 7333400 from 316bdbd6524e5c03c2aeb86499bda6c13b5124ae to sc-d1-release (4f668fd6) · Commits · e / devices / smdk4412 / android_frameworks_native

libs/binder/Binder.cpp

+10 −0

Original line number	Diff line number	Diff line
		@@ -29,6 +29,16 @@

		namespace android {

		// Service implementations inherit from BBinder and IBinder, and this is frozen
		// in prebuilts.
		#ifdef __LP64__
		static_assert(sizeof(IBinder) == 24);
		static_assert(sizeof(BBinder) == 40);
		#else
		static_assert(sizeof(IBinder) == 12);
		static_assert(sizeof(BBinder) == 20);
		#endif

		// ---------------------------------------------------------------------------

		IBinder::IBinder()

libs/binder/Parcel.cpp

+5 −1

Original line number	Diff line number	Diff line
		@@ -78,7 +78,11 @@ static size_t pad_size(size_t s) {
		namespace android {

		// many things compile this into prebuilts on the stack
		static_assert(sizeof(Parcel) == 60 \|\| sizeof(Parcel) == 120);
		#ifdef __LP64__
		static_assert(sizeof(Parcel) == 120);
		#else
		static_assert(sizeof(Parcel) == 60);
		#endif

		static std::atomic<size_t> gParcelGlobalAllocCount;
		static std::atomic<size_t> gParcelGlobalAllocSize;

libs/binder/RpcConnection.cpp

+34 −220

Original line number	Diff line number	Diff line
		@@ -18,13 +18,7 @@

		#include <binder/RpcConnection.h>

		#include <arpa/inet.h>
		#include <inttypes.h>
		#include <netdb.h>
		#include <netinet/in.h>
		#include <sys/socket.h>
		#include <sys/types.h>
		#include <sys/un.h>
		#include <unistd.h>

		#include <string_view>
		@@ -33,6 +27,7 @@
		#include <binder/Stability.h>
		#include <utils/String8.h>

		#include "RpcSocketAddress.h"
		#include "RpcState.h"
		#include "RpcWireFormat.h"

		@@ -40,62 +35,9 @@
		extern "C" pid_t gettid();
		#endif

		#ifdef __BIONIC__
		#include <linux/vm_sockets.h>
		#endif

		namespace android {

		using base::borrowed_fd;
		using base::unique_fd;
		using AddrInfo = std::unique_ptr<addrinfo, decltype(&freeaddrinfo)>;

		namespace {
		bool checkSockaddrSize(const char* name, size_t actual, size_t expected) {
		if (actual >= expected) return true;
		ALOGW("getSockaddrPort: family is %s but size is %zu < %zu", name, actual, expected);
		return false;
		}

		// Get the port number of \|storage\| for certain families. Requires storage->sa_family to be
		// set to a known family; otherwise, return nullopt.
		std::optional<unsigned int> getSockaddrPort(const sockaddr* storage, socklen_t len) {
		switch (storage->sa_family) {
		case AF_INET: {
		if (!checkSockaddrSize("INET", len, sizeof(sockaddr_in))) return std::nullopt;
		auto inetStorage = reinterpret_cast<const sockaddr_in*>(storage);
		return ntohs(inetStorage->sin_port);
		}
		default: {
		uint16_t family = storage->sa_family;
		ALOGW("Don't know how to infer port for family %" PRIu16, family);
		return std::nullopt;
		}
		}
		}

		std::optional<unsigned int> getSocketPort(borrowed_fd socketfd,
		const RpcConnection::SocketAddress& socketAddress) {
		sockaddr_storage storage{};
		socklen_t len = sizeof(storage);
		auto storagePtr = reinterpret_cast<sockaddr*>(&storage);
		if (0 != getsockname(socketfd.get(), storagePtr, &len)) {
		int savedErrno = errno;
		ALOGE("Could not getsockname at %s: %s", socketAddress.toString().c_str(),
		strerror(savedErrno));
		return std::nullopt;
		}

		// getsockname does not fill in family, but getSockaddrPort() needs it.
		if (storage.ss_family == AF_UNSPEC) {
		storage.ss_family = socketAddress.addr()->sa_family;
		}
		return getSockaddrPort(storagePtr, len);
		}

		} // namespace

		RpcConnection::SocketAddress::~SocketAddress() {}

		RpcConnection::RpcConnection() {
		LOG_RPC_DETAIL("RpcConnection created %p", this);
		@@ -114,134 +56,20 @@ sp<RpcConnection> RpcConnection::make() {
		return sp<RpcConnection>::make();
		}

		class UnixSocketAddress : public RpcConnection::SocketAddress {
		public:
		explicit UnixSocketAddress(const char* path) : mAddr({.sun_family = AF_UNIX}) {
		unsigned int pathLen = strlen(path) + 1;
		LOG_ALWAYS_FATAL_IF(pathLen > sizeof(mAddr.sun_path), "Socket path is too long: %u %s",
		pathLen, path);
		memcpy(mAddr.sun_path, path, pathLen);
		}
		virtual ~UnixSocketAddress() {}
		std::string toString() const override {
		return String8::format("path '%.*s'", static_cast<int>(sizeof(mAddr.sun_path)),
		mAddr.sun_path)
		.c_str();
		}
		const sockaddr* addr() const override { return reinterpret_cast<const sockaddr*>(&mAddr); }
		size_t addrSize() const override { return sizeof(mAddr); }

		private:
		sockaddr_un mAddr;
		};

		bool RpcConnection::setupUnixDomainServer(const char* path) {
		return setupSocketServer(UnixSocketAddress(path));
		}

		bool RpcConnection::setupUnixDomainClient(const char* path) {
		return setupSocketClient(UnixSocketAddress(path));
		}

		#ifdef __BIONIC__

		class VsockSocketAddress : public RpcConnection::SocketAddress {
		public:
		VsockSocketAddress(unsigned int cid, unsigned int port)
		: mAddr({
		.svm_family = AF_VSOCK,
		.svm_port = port,
		.svm_cid = cid,
		}) {}
		virtual ~VsockSocketAddress() {}
		std::string toString() const override {
		return String8::format("cid %u port %u", mAddr.svm_cid, mAddr.svm_port).c_str();
		}
		const sockaddr* addr() const override { return reinterpret_cast<const sockaddr*>(&mAddr); }
		size_t addrSize() const override { return sizeof(mAddr); }

		private:
		sockaddr_vm mAddr;
		};

		bool RpcConnection::setupVsockServer(unsigned int port) {
		// realizing value w/ this type at compile time to avoid ubsan abort
		constexpr unsigned int kAnyCid = VMADDR_CID_ANY;

		return setupSocketServer(VsockSocketAddress(kAnyCid, port));
		}

		bool RpcConnection::setupVsockClient(unsigned int cid, unsigned int port) {
		return setupSocketClient(VsockSocketAddress(cid, port));
		}

		#endif // __BIONIC__

		class InetSocketAddress : public RpcConnection::SocketAddress {
		public:
		InetSocketAddress(const sockaddr* sockAddr, size_t size, const char* addr, unsigned int port)
		: mSockAddr(sockAddr), mSize(size), mAddr(addr), mPort(port) {}
		[[nodiscard]] std::string toString() const override {
		return String8::format("%s:%u", mAddr, mPort).c_str();
		}
		[[nodiscard]] const sockaddr* addr() const override { return mSockAddr; }
		[[nodiscard]] size_t addrSize() const override { return mSize; }

		private:
		const sockaddr* mSockAddr;
		size_t mSize;
		const char* mAddr;
		unsigned int mPort;
		};

		AddrInfo GetAddrInfo(const char* addr, unsigned int port) {
		addrinfo hint{
		.ai_flags = 0,
		.ai_family = AF_UNSPEC,
		.ai_socktype = SOCK_STREAM,
		.ai_protocol = 0,
		};
		addrinfo* aiStart = nullptr;
		if (int rc = getaddrinfo(addr, std::to_string(port).data(), &hint, &aiStart); 0 != rc) {
		ALOGE("Unable to resolve %s:%u: %s", addr, port, gai_strerror(rc));
		return AddrInfo(nullptr, nullptr);
		}
		if (aiStart == nullptr) {
		ALOGE("Unable to resolve %s:%u: getaddrinfo returns null", addr, port);
		return AddrInfo(nullptr, nullptr);
		}
		return AddrInfo(aiStart, &freeaddrinfo);
		}

		bool RpcConnection::setupInetServer(unsigned int port, unsigned int* assignedPort) {
		const char* kAddr = "127.0.0.1";

		if (assignedPort != nullptr) *assignedPort = 0;
		auto aiStart = GetAddrInfo(kAddr, port);
		if (aiStart == nullptr) return false;
		for (auto ai = aiStart.get(); ai != nullptr; ai = ai->ai_next) {
		InetSocketAddress socketAddress(ai->ai_addr, ai->ai_addrlen, kAddr, port);
		if (!setupSocketServer(socketAddress)) {
		continue;
		}
		auto realPort = getSocketPort(mServer.get(), socketAddress);
		LOG_ALWAYS_FATAL_IF(!realPort.has_value(), "Unable to get port number after setting up %s",
		socketAddress.toString().c_str());
		LOG_ALWAYS_FATAL_IF(port != 0 && *realPort != port,
		"Requesting inet server on %s but it is set up on %u.",
		socketAddress.toString().c_str(), *realPort);
		if (assignedPort != nullptr) {
		assignedPort = realPort;
		}
		return true;
		}
		ALOGE("None of the socket address resolved for %s:%u can be set up as inet server.", kAddr,
		port);
		return false;
		}

		bool RpcConnection::setupInetClient(const char* addr, unsigned int port) {
		auto aiStart = GetAddrInfo(addr, port);
		auto aiStart = InetSocketAddress::getAddrInfo(addr, port);
		if (aiStart == nullptr) return false;
		for (auto ai = aiStart.get(); ai != nullptr; ai = ai->ai_next) {
		InetSocketAddress socketAddress(ai->ai_addr, ai->ai_addrlen, addr, port);
		@@ -287,23 +115,28 @@ status_t RpcConnection::sendDecStrong(const RpcAddress& address) {
		return state()->sendDecStrong(socket.fd(), address);
		}

		void RpcConnection::join() {
		// TODO(b/185167543): do this dynamically, instead of from a static number
		// of threads
		unique_fd clientFd(
		TEMP_FAILURE_RETRY(accept4(mServer.get(), nullptr, 0 /length/, SOCK_CLOEXEC)));
		if (clientFd < 0) {
		// If this log becomes confusing, should save more state from setupUnixDomainServer
		// in order to output here.
		ALOGE("Could not accept4 socket: %s", strerror(errno));
		return;
		status_t RpcConnection::readId() {
		{
		std::lock_guard<std::mutex> _l(mSocketMutex);
		LOG_ALWAYS_FATAL_IF(mForServer != nullptr, "Can only update ID for client.");
		}

		LOG_RPC_DETAIL("accept4 on fd %d yields fd %d", mServer.get(), clientFd.get());
		int32_t id;

		ExclusiveSocket socket(sp<RpcConnection>::fromExisting(this), SocketUse::CLIENT);
		status_t status =
		state()->getConnectionId(socket.fd(), sp<RpcConnection>::fromExisting(this), &id);
		if (status != OK) return status;

		LOG_RPC_DETAIL("RpcConnection %p has id %d", this, id);
		mId = id;
		return OK;
		}

		void RpcConnection::join(unique_fd client) {
		// must be registered to allow arbitrary client code executing commands to
		// be able to do nested calls (we can't only read from it)
		sp<ConnectionSocket> socket = assignServerToThisThread(std::move(clientFd));
		sp<ConnectionSocket> socket = assignServerToThisThread(std::move(client));

		while (true) {
		status_t error =
		@@ -319,41 +152,11 @@ void RpcConnection::join() {
		"bad state: socket object guaranteed to be in list");
		}

		void RpcConnection::setForServer(const wp<RpcServer>& server) {
		mForServer = server;
		}

		wp<RpcServer> RpcConnection::server() {
		return mForServer;
		}

		bool RpcConnection::setupSocketServer(const SocketAddress& addr) {
		LOG_ALWAYS_FATAL_IF(mServer.get() != -1, "Each RpcConnection can only have one server.");

		unique_fd serverFd(
		TEMP_FAILURE_RETRY(socket(addr.addr()->sa_family, SOCK_STREAM \| SOCK_CLOEXEC, 0)));
		if (serverFd == -1) {
		ALOGE("Could not create socket: %s", strerror(errno));
		return false;
		}

		if (0 != TEMP_FAILURE_RETRY(bind(serverFd.get(), addr.addr(), addr.addrSize()))) {
		int savedErrno = errno;
		ALOGE("Could not bind socket at %s: %s", addr.toString().c_str(), strerror(savedErrno));
		return false;
		}

		if (0 != TEMP_FAILURE_RETRY(listen(serverFd.get(), 1 /backlog/))) {
		int savedErrno = errno;
		ALOGE("Could not listen socket at %s: %s", addr.toString().c_str(), strerror(savedErrno));
		return false;
		}

		mServer = std::move(serverFd);
		return true;
		}

		bool RpcConnection::setupSocketClient(const SocketAddress& addr) {
		bool RpcConnection::setupSocketClient(const RpcSocketAddress& addr) {
		{
		std::lock_guard<std::mutex> _l(mSocketMutex);
		LOG_ALWAYS_FATAL_IF(mClients.size() != 0,
		@@ -373,6 +176,12 @@ bool RpcConnection::setupSocketClient(const SocketAddress& addr) {
		return false;
		}

		if (status_t status = readId(); status != OK) {
		ALOGE("Could not get connection id after initial connection to %s; %s",
		addr.toString().c_str(), statusToString(status).c_str());
		return false;
		}

		// we've already setup one client
		for (size_t i = 0; i + 1 < numThreadsAvailable; i++) {
		// TODO(b/185167543): avoid race w/ accept4 not being called on server
		@@ -385,7 +194,7 @@ bool RpcConnection::setupSocketClient(const SocketAddress& addr) {
		return true;
		}

		bool RpcConnection::setupOneSocketClient(const SocketAddress& addr) {
		bool RpcConnection::setupOneSocketClient(const RpcSocketAddress& addr) {
		unique_fd serverFd(
		TEMP_FAILURE_RETRY(socket(addr.addr()->sa_family, SOCK_STREAM \| SOCK_CLOEXEC, 0)));
		if (serverFd == -1) {
		@@ -406,14 +215,19 @@ bool RpcConnection::setupOneSocketClient(const SocketAddress& addr) {
		return true;
		}

		void RpcConnection::addClient(unique_fd&& fd) {
		void RpcConnection::addClient(unique_fd fd) {
		std::lock_guard<std::mutex> _l(mSocketMutex);
		sp<ConnectionSocket> connection = sp<ConnectionSocket>::make();
		connection->fd = std::move(fd);
		mClients.push_back(connection);
		}

		sp<RpcConnection::ConnectionSocket> RpcConnection::assignServerToThisThread(unique_fd&& fd) {
		void RpcConnection::setForServer(const wp<RpcServer>& server, int32_t connectionId) {
		mId = connectionId;
		mForServer = server;
		}

		sp<RpcConnection::ConnectionSocket> RpcConnection::assignServerToThisThread(unique_fd fd) {
		std::lock_guard<std::mutex> _l(mSocketMutex);
		sp<ConnectionSocket> connection = sp<ConnectionSocket>::make();
		connection->fd = std::move(fd);

libs/binder/RpcServer.cpp

+115 −22

Original line number	Diff line number	Diff line
		@@ -27,10 +27,13 @@
		#include <log/log.h>
		#include "RpcState.h"

		#include "RpcSocketAddress.h"
		#include "RpcWireFormat.h"

		namespace android {

		using base::unique_fd;

		RpcServer::RpcServer() {}
		RpcServer::~RpcServer() {}

		@@ -42,14 +45,63 @@ void RpcServer::iUnderstandThisCodeIsExperimentalAndIWillNotUseItInProduction()
		mAgreedExperimental = true;
		}

		bool RpcServer::setupUnixDomainServer(const char* path) {
		return setupSocketServer(UnixSocketAddress(path));
		}

		#ifdef __BIONIC__

		bool RpcServer::setupVsockServer(unsigned int port) {
		// realizing value w/ this type at compile time to avoid ubsan abort
		constexpr unsigned int kAnyCid = VMADDR_CID_ANY;

		return setupSocketServer(VsockSocketAddress(kAnyCid, port));
		}

		#endif // __BIONIC__

		bool RpcServer::setupInetServer(unsigned int port, unsigned int* assignedPort) {
		const char* kAddr = "127.0.0.1";

		if (assignedPort != nullptr) *assignedPort = 0;
		auto aiStart = InetSocketAddress::getAddrInfo(kAddr, port);
		if (aiStart == nullptr) return false;
		for (auto ai = aiStart.get(); ai != nullptr; ai = ai->ai_next) {
		InetSocketAddress socketAddress(ai->ai_addr, ai->ai_addrlen, kAddr, port);
		if (!setupSocketServer(socketAddress)) {
		continue;
		}

		LOG_ALWAYS_FATAL_IF(socketAddress.addr()->sa_family != AF_INET, "expecting inet");
		sockaddr_in addr{};
		socklen_t len = sizeof(addr);
		if (0 != getsockname(mServer.get(), reinterpret_cast<sockaddr*>(&addr), &len)) {
		int savedErrno = errno;
		ALOGE("Could not getsockname at %s: %s", socketAddress.toString().c_str(),
		strerror(savedErrno));
		return false;
		}
		LOG_ALWAYS_FATAL_IF(len != sizeof(addr), "Wrong socket type: len %zu vs len %zu",
		static_cast<size_t>(len), sizeof(addr));
		unsigned int realPort = ntohs(addr.sin_port);
		LOG_ALWAYS_FATAL_IF(port != 0 && realPort != port,
		"Requesting inet server on %s but it is set up on %u.",
		socketAddress.toString().c_str(), realPort);

		if (assignedPort != nullptr) {
		*assignedPort = realPort;
		}

		return true;
		}
		ALOGE("None of the socket address resolved for %s:%u can be set up as inet server.", kAddr,
		port);
		return false;
		}

		void RpcServer::setMaxThreads(size_t threads) {
		LOG_ALWAYS_FATAL_IF(threads <= 0, "RpcServer is useless without threads");
		{
		// this lock should only ever be needed in the error case
		std::lock_guard<std::mutex> _l(mLock);
		LOG_ALWAYS_FATAL_IF(mConnections.size() > 0,
		"Must specify max threads before creating a connection");
		}
		LOG_ALWAYS_FATAL_IF(mStarted, "must be called before started");
		mMaxThreads = threads;
		}

		@@ -67,29 +119,35 @@ sp<IBinder> RpcServer::getRootObject() {
		return mRootObject;
		}

		sp<RpcConnection> RpcServer::addClientConnection() {
		void RpcServer::join() {
		LOG_ALWAYS_FATAL_IF(!mAgreedExperimental, "no!");

		auto connection = RpcConnection::make();
		connection->setForServer(sp<RpcServer>::fromExisting(this));
		{
		std::lock_guard<std::mutex> _l(mLock);
		LOG_ALWAYS_FATAL_IF(mStarted,
		"currently only supports adding client connections at creation time");
		mConnections.push_back(connection);
		}
		return connection;
		}

		void RpcServer::join() {
		std::vector<std::thread> pool;
		{
		std::lock_guard<std::mutex> _l(mLock);
		LOG_ALWAYS_FATAL_IF(mServer.get() == -1, "RpcServer must be setup to join.");
		// TODO(b/185167543): support more than one client at once
		mConnection = RpcConnection::make();
		mConnection->setForServer(sp<RpcServer>::fromExisting(this), 42 /placeholder id/);

		mStarted = true;
		for (const sp<RpcConnection>& connection : mConnections) {
		for (size_t i = 0; i < mMaxThreads; i++) {
		pool.push_back(std::thread([=] { connection->join(); }));
		pool.push_back(std::thread([=] {
		// TODO(b/185167543): do this dynamically, instead of from a static number
		// of threads
		unique_fd clientFd(TEMP_FAILURE_RETRY(
		accept4(mServer.get(), nullptr, 0 /length/, SOCK_CLOEXEC)));
		if (clientFd < 0) {
		// If this log becomes confusing, should save more state from
		// setupUnixDomainServer in order to output here.
		ALOGE("Could not accept4 socket: %s", strerror(errno));
		return;
		}

		LOG_RPC_DETAIL("accept4 on fd %d yields fd %d", mServer.get(), clientFd.get());

		mConnection->join(std::move(clientFd));
		}));
		}
		}

		@@ -98,4 +156,39 @@ void RpcServer::join() {
		for (auto& t : pool) t.join();
		}

		std::vector<sp<RpcConnection>> RpcServer::listConnections() {
		std::lock_guard<std::mutex> _l(mLock);
		if (mConnection == nullptr) return {};
		return {mConnection};
		}

		bool RpcServer::setupSocketServer(const RpcSocketAddress& addr) {
		{
		std::lock_guard<std::mutex> _l(mLock);
		LOG_ALWAYS_FATAL_IF(mServer.get() != -1, "Each RpcServer can only have one server.");
		}

		unique_fd serverFd(
		TEMP_FAILURE_RETRY(socket(addr.addr()->sa_family, SOCK_STREAM \| SOCK_CLOEXEC, 0)));
		if (serverFd == -1) {
		ALOGE("Could not create socket: %s", strerror(errno));
		return false;
		}

		if (0 != TEMP_FAILURE_RETRY(bind(serverFd.get(), addr.addr(), addr.addrSize()))) {
		int savedErrno = errno;
		ALOGE("Could not bind socket at %s: %s", addr.toString().c_str(), strerror(savedErrno));
		return false;
		}

		if (0 != TEMP_FAILURE_RETRY(listen(serverFd.get(), 1 /backlog/))) {
		int savedErrno = errno;
		ALOGE("Could not listen socket at %s: %s", addr.toString().c_str(), strerror(savedErrno));
		return false;
		}

		mServer = std::move(serverFd);
		return true;
		}

		} // namespace android

libs/binder/RpcSocketAddress.h

0 → 100644

+122 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2021 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.
		*/
		#pragma once

		#include <string>

		#include <arpa/inet.h>
		#include <netdb.h>
		#include <netinet/in.h>
		#include <sys/socket.h>
		#include <sys/types.h>
		#include <sys/un.h>

		#ifdef __BIONIC__
		#include <linux/vm_sockets.h>
		#endif

		namespace android {

		class RpcSocketAddress {
		public:
		virtual ~RpcSocketAddress() {}
		virtual std::string toString() const = 0;
		virtual const sockaddr* addr() const = 0;
		virtual size_t addrSize() const = 0;
		};

		class UnixSocketAddress : public RpcSocketAddress {
		public:
		explicit UnixSocketAddress(const char* path) : mAddr({.sun_family = AF_UNIX}) {
		unsigned int pathLen = strlen(path) + 1;
		LOG_ALWAYS_FATAL_IF(pathLen > sizeof(mAddr.sun_path), "Socket path is too long: %u %s",
		pathLen, path);
		memcpy(mAddr.sun_path, path, pathLen);
		}
		virtual ~UnixSocketAddress() {}
		std::string toString() const override {
		return String8::format("path '%.*s'", static_cast<int>(sizeof(mAddr.sun_path)),
		mAddr.sun_path)
		.c_str();
		}
		const sockaddr* addr() const override { return reinterpret_cast<const sockaddr*>(&mAddr); }
		size_t addrSize() const override { return sizeof(mAddr); }

		private:
		sockaddr_un mAddr;
		};

		#ifdef __BIONIC__

		class VsockSocketAddress : public RpcSocketAddress {
		public:
		VsockSocketAddress(unsigned int cid, unsigned int port)
		: mAddr({
		.svm_family = AF_VSOCK,
		.svm_port = port,
		.svm_cid = cid,
		}) {}
		virtual ~VsockSocketAddress() {}
		std::string toString() const override {
		return String8::format("cid %u port %u", mAddr.svm_cid, mAddr.svm_port).c_str();
		}
		const sockaddr* addr() const override { return reinterpret_cast<const sockaddr*>(&mAddr); }
		size_t addrSize() const override { return sizeof(mAddr); }

		private:
		sockaddr_vm mAddr;
		};

		#endif // __BIONIC__

		class InetSocketAddress : public RpcSocketAddress {
		public:
		InetSocketAddress(const sockaddr* sockAddr, size_t size, const char* addr, unsigned int port)
		: mSockAddr(sockAddr), mSize(size), mAddr(addr), mPort(port) {}
		[[nodiscard]] std::string toString() const override {
		return String8::format("%s:%u", mAddr, mPort).c_str();
		}
		[[nodiscard]] const sockaddr* addr() const override { return mSockAddr; }
		[[nodiscard]] size_t addrSize() const override { return mSize; }

		using AddrInfo = std::unique_ptr<addrinfo, decltype(&freeaddrinfo)>;
		static AddrInfo getAddrInfo(const char* addr, unsigned int port) {
		addrinfo hint{
		.ai_flags = 0,
		.ai_family = AF_UNSPEC,
		.ai_socktype = SOCK_STREAM,
		.ai_protocol = 0,
		};
		addrinfo* aiStart = nullptr;
		if (int rc = getaddrinfo(addr, std::to_string(port).data(), &hint, &aiStart); 0 != rc) {
		ALOGE("Unable to resolve %s:%u: %s", addr, port, gai_strerror(rc));
		return AddrInfo(nullptr, nullptr);
		}
		if (aiStart == nullptr) {
		ALOGE("Unable to resolve %s:%u: getaddrinfo returns null", addr, port);
		return AddrInfo(nullptr, nullptr);
		}
		return AddrInfo(aiStart, &freeaddrinfo);
		}

		private:
		const sockaddr* mSockAddr;
		size_t mSize;
		const char* mAddr;
		unsigned int mPort;
		};

		} // namespace android