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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "services/network/tcp_server_socket.h"
#include <optional>
#include <utility>
#include "base/check_op.h"
#include "base/functional/bind.h"
#include "base/memory/ptr_util.h"
#include "base/numerics/safe_conversions.h"
#include "mojo/public/cpp/bindings/pending_remote.h"
#include "net/base/io_buffer.h"
#include "net/base/net_errors.h"
#include "net/log/net_log.h"
#include "net/socket/tcp_server_socket.h"
#include "services/network/tcp_connected_socket.h"
namespace network {
TCPServerSocket::TCPServerSocket(
Delegate* delegate,
net::NetLog* net_log,
const net::NetworkTrafficAnnotationTag& traffic_annotation)
: TCPServerSocket(
std::make_unique<net::TCPServerSocket>(net_log, net::NetLogSource()),
0 /*backlog*/,
delegate,
traffic_annotation) {}
TCPServerSocket::TCPServerSocket(
std::unique_ptr<net::ServerSocket> server_socket,
int backlog,
Delegate* delegate,
const net::NetworkTrafficAnnotationTag& traffic_annotation)
: delegate_(delegate),
socket_(std::move(server_socket)),
backlog_(backlog),
traffic_annotation_(traffic_annotation) {}
TCPServerSocket::~TCPServerSocket() {}
base::expected<net::IPEndPoint, int32_t> TCPServerSocket::Listen(
const net::IPEndPoint& local_addr,
int backlog,
std::optional<bool> ipv6_only) {
if (backlog == 0) {
// SocketPosix::Listen and TCPSocketWin::Listen DCHECKs on backlog > 0.
return base::unexpected(net::ERR_INVALID_ARGUMENT);
}
backlog_ = backlog;
int net_error = socket_->Listen(local_addr, backlog, ipv6_only);
net::IPEndPoint local_addr_out;
if (net_error == net::OK) {
net_error = socket_->GetLocalAddress(&local_addr_out);
}
if (net_error == net::OK) {
return local_addr_out;
}
return base::unexpected(net_error);
}
void TCPServerSocket::Accept(
mojo::PendingRemote<mojom::SocketObserver> observer,
AcceptCallback callback) {
if (pending_accepts_queue_.size() >= static_cast<size_t>(backlog_)) {
std::move(callback).Run(net::ERR_INSUFFICIENT_RESOURCES, std::nullopt,
mojo::NullRemote(),
mojo::ScopedDataPipeConsumerHandle(),
mojo::ScopedDataPipeProducerHandle());
return;
}
pending_accepts_queue_.push_back(std::make_unique<PendingAccept>(
std::move(callback), std::move(observer)));
if (pending_accepts_queue_.size() == 1)
ProcessNextAccept();
}
#if BUILDFLAG(IS_CHROMEOS)
void TCPServerSocket::AttachConnectionTracker(
mojo::PendingRemote<mojom::SocketConnectionTracker> connection_tracker) {
connection_tracker_ = std::move(connection_tracker);
}
#endif // BUILDFLAG(IS_CHROMEOS)
void TCPServerSocket::SetSocketForTest(
std::unique_ptr<net::ServerSocket> socket) {
socket_ = std::move(socket);
}
TCPServerSocket::PendingAccept::PendingAccept(
AcceptCallback callback,
mojo::PendingRemote<mojom::SocketObserver> observer)
: callback(std::move(callback)), observer(std::move(observer)) {}
TCPServerSocket::PendingAccept::~PendingAccept() {}
void TCPServerSocket::OnAcceptCompleted(int result) {
DCHECK_NE(net::ERR_IO_PENDING, result);
DCHECK(!pending_accepts_queue_.empty());
auto pending_accept = std::move(pending_accepts_queue_.front());
pending_accepts_queue_.erase(pending_accepts_queue_.begin());
mojo::ScopedDataPipeProducerHandle send_producer_handle;
mojo::ScopedDataPipeConsumerHandle send_consumer_handle;
if (result == net::OK) {
DCHECK(accepted_socket_);
if (mojo::CreateDataPipe(nullptr, send_producer_handle,
send_consumer_handle) != MOJO_RESULT_OK) {
result = net::ERR_FAILED;
}
}
mojo::ScopedDataPipeProducerHandle receive_producer_handle;
mojo::ScopedDataPipeConsumerHandle receive_consumer_handle;
if (result == net::OK) {
if (mojo::CreateDataPipe(nullptr, receive_producer_handle,
receive_consumer_handle) != MOJO_RESULT_OK) {
result = net::ERR_FAILED;
}
}
if (result == net::OK) {
mojo::PendingRemote<mojom::TCPConnectedSocket> socket;
auto connected_socket = std::make_unique<TCPConnectedSocket>(
std::move(pending_accept->observer),
base::WrapUnique(static_cast<net::TransportClientSocket*>(
accepted_socket_.release())),
std::move(receive_producer_handle), std::move(send_consumer_handle),
traffic_annotation_);
delegate_->OnAccept(std::move(connected_socket),
socket.InitWithNewPipeAndPassReceiver());
std::move(pending_accept->callback)
.Run(result, accepted_address_, std::move(socket),
std::move(receive_consumer_handle),
std::move(send_producer_handle));
} else {
std::move(pending_accept->callback)
.Run(result, std::nullopt, mojo::NullRemote(),
mojo::ScopedDataPipeConsumerHandle(),
mojo::ScopedDataPipeProducerHandle());
}
ProcessNextAccept();
}
void TCPServerSocket::ProcessNextAccept() {
if (pending_accepts_queue_.empty())
return;
int result =
socket_->Accept(&accepted_socket_,
base::BindOnce(&TCPServerSocket::OnAcceptCompleted,
base::Unretained(this)),
&accepted_address_);
if (result == net::ERR_IO_PENDING)
return;
OnAcceptCompleted(result);
}
} // namespace network
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