78 lines
2.2 KiB
C++
78 lines
2.2 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 <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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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 << " completed";
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}
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void SetupProxying(SharedFD client, SharedFD target) {
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std::thread([client, target]() {
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std::thread client2target(Forward, "client2target", client, target);
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Forward("target2client", target, client);
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client2target.join();
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// The actual proxying is handled in a detached thread so that this function
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// returns immediately
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}).detach();
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}
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} // namespace
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void Proxy(SharedFD server, std::function<SharedFD()> conn_factory) {
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while (server->IsOpen()) {
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auto client = SharedFD::Accept(*server);
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if (!client->IsOpen()) {
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LOG(ERROR) << "Failed to accept connection in server: "
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<< client->StrError();
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continue;
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}
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auto target = conn_factory();
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if (target->IsOpen()) {
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SetupProxying(client, target);
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}
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// The client will close when it goes out of scope here if the target didn't
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// open.
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}
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LOG(INFO) << "Server closed: " << server->StrError();
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}
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} // namespace cuttlefish
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