137 lines
4.0 KiB
C++
137 lines
4.0 KiB
C++
/*
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* Copyright (C) 2022 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "common/libs/utils/socket2socket_proxy.h"
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#include <poll.h>
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#include <sys/socket.h>
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#include <cstring>
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#include <functional>
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#include <memory>
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#include <ostream>
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#include <string>
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#include <thread>
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#include <android-base/logging.h>
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namespace cuttlefish {
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namespace {
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void Forward(const std::string& label, SharedFD from, SharedFD to) {
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LOG(DEBUG) << label << ": Proxy thread started. Starting copying data";
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auto success = to->CopyAllFrom(*from);
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if (!success) {
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if (from->GetErrno()) {
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LOG(ERROR) << label << ": Error reading: " << from->StrError();
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}
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if (to->GetErrno()) {
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LOG(ERROR) << label << ": Error writing: " << to->StrError();
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}
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}
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to->Shutdown(SHUT_WR);
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LOG(DEBUG) << label << ": Proxy thread completed";
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}
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void SetupProxying(SharedFD client, SharedFD target) {
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LOG(DEBUG) << "Launching proxy threads";
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std::thread client2target(Forward, "c2t", client, target);
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std::thread target2client(Forward, "t2c", target, client);
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client2target.detach();
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target2client.detach();
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}
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} // namespace
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ProxyServer::ProxyServer(SharedFD server, std::function<SharedFD()> clients_factory)
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: stop_fd_(SharedFD::Event()) {
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if (!stop_fd_->IsOpen()) {
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LOG(FATAL) << "Failed to open eventfd: " << stop_fd_->StrError();
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return;
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}
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server_ = std::thread([&, server_fd = std::move(server),
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clients_factory = std::move(clients_factory)]() {
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constexpr ssize_t SERVER = 0;
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constexpr ssize_t STOP = 1;
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std::vector<PollSharedFd> server_poll = {
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{.fd = server_fd, .events = POLLIN},
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{.fd = stop_fd_, .events = POLLIN}
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};
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while (server_fd->IsOpen()) {
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server_poll[SERVER].revents = 0;
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server_poll[STOP].revents = 0;
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const int poll_result = SharedFD::Poll(server_poll, -1);
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if (poll_result < 0) {
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LOG(ERROR) << "Failed to poll to wait for incoming connection";
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continue;
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}
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if (server_poll[STOP].revents & POLLIN) {
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// Stop fd is available to read, so we received a stop event
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// and must stop the thread
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break;
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}
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if (!(server_poll[SERVER].revents & POLLIN)) {
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continue;
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}
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// Server fd is available to read, so we can accept the
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// connection without blocking on that
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auto client = SharedFD::Accept(*server_fd);
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if (!client->IsOpen()) {
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LOG(ERROR) << "Failed to accept incoming connection: " << client->StrError();
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continue;
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}
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auto target = clients_factory();
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if (target->IsOpen()) {
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SetupProxying(client, target);
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} else {
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LOG(ERROR) << "Cannot connect to the target to setup proxying: " << target->StrError();
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}
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// The client will close when it goes out of scope here if the target
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// didn't open.
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}
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});
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}
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void ProxyServer::Join() {
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if (server_.joinable()) {
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server_.join();
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}
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}
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ProxyServer::~ProxyServer() {
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if (stop_fd_->EventfdWrite(1) != 0) {
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LOG(ERROR) << "Failed to stop proxy thread: " << stop_fd_->StrError();
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}
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Join();
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}
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void Proxy(SharedFD server, std::function<SharedFD()> conn_factory) {
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ProxyServer proxy(std::move(server), std::move(conn_factory));
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proxy.Join();
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}
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std::unique_ptr<ProxyServer> ProxyAsync(SharedFD server, std::function<SharedFD()> conn_factory) {
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return std::unique_ptr<ProxyServer>(
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new ProxyServer(std::move(server), std::move(conn_factory)));
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}
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} // namespace cuttlefish
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