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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/socket/tcp_server_socket.h"
#include <memory>
#include <utility>
#include "base/check.h"
#include "base/functional/bind.h"
#include "base/functional/callback_helpers.h"
#include "base/notreached.h"
#include "net/base/net_errors.h"
#include "net/socket/socket_descriptor.h"
#include "net/socket/tcp_client_socket.h"
namespace net {
TCPServerSocket::TCPServerSocket(NetLog* net_log, const NetLogSource& source)
: TCPServerSocket(
TCPSocket::Create(nullptr /* socket_performance_watcher */,
net_log,
source)) {}
TCPServerSocket::TCPServerSocket(std::unique_ptr<TCPSocket> socket)
: socket_(std::move(socket)) {}
int TCPServerSocket::AdoptSocket(SocketDescriptor socket) {
adopted_opened_socket_ = true;
return socket_->AdoptUnconnectedSocket(socket);
}
TCPServerSocket::~TCPServerSocket() = default;
int TCPServerSocket::Listen(const IPEndPoint& address,
int backlog,
std::optional<bool> ipv6_only) {
int result = OK;
if (!adopted_opened_socket_) {
result = socket_->Open(address.GetFamily());
if (result != OK) {
return result;
}
}
if (ipv6_only.has_value()) {
CHECK_EQ(address.address(), net::IPAddress::IPv6AllZeros());
result = socket_->SetIPv6Only(*ipv6_only);
if (result != OK) {
socket_->Close();
return result;
}
}
result = socket_->SetDefaultOptionsForServer();
if (result != OK) {
socket_->Close();
return result;
}
result = socket_->Bind(address);
if (result != OK) {
socket_->Close();
return result;
}
result = socket_->Listen(backlog);
if (result != OK) {
socket_->Close();
return result;
}
return OK;
}
int TCPServerSocket::GetLocalAddress(IPEndPoint* address) const {
return socket_->GetLocalAddress(address);
}
int TCPServerSocket::Accept(std::unique_ptr<StreamSocket>* socket,
CompletionOnceCallback callback) {
return Accept(socket, std::move(callback), nullptr);
}
int TCPServerSocket::Accept(std::unique_ptr<StreamSocket>* socket,
CompletionOnceCallback callback,
IPEndPoint* peer_address) {
DCHECK(socket);
DCHECK(!callback.is_null());
if (pending_accept_) {
NOTREACHED();
}
// It is safe to use base::Unretained(this). |socket_| is owned by this class,
// and the callback won't be run after |socket_| is destroyed.
CompletionOnceCallback accept_callback = base::BindOnce(
&TCPServerSocket::OnAcceptCompleted, base::Unretained(this), socket,
peer_address, std::move(callback));
int result = socket_->Accept(&accepted_socket_, &accepted_address_,
std::move(accept_callback));
if (result != ERR_IO_PENDING) {
// |accept_callback| won't be called so we need to run
// ConvertAcceptedSocket() ourselves in order to do the conversion from
// |accepted_socket_| to |socket|.
result = ConvertAcceptedSocket(result, socket, peer_address);
} else {
pending_accept_ = true;
}
return result;
}
void TCPServerSocket::DetachFromThread() {
socket_->DetachFromThread();
}
int TCPServerSocket::ConvertAcceptedSocket(
int result,
std::unique_ptr<StreamSocket>* output_accepted_socket,
IPEndPoint* output_accepted_address) {
// Make sure the TCPSocket object is destroyed in any case.
std::unique_ptr<TCPSocket> temp_accepted_socket(std::move(accepted_socket_));
if (result != OK)
return result;
if (output_accepted_address)
*output_accepted_address = accepted_address_;
*output_accepted_socket = std::make_unique<TCPClientSocket>(
std::move(temp_accepted_socket), accepted_address_);
return OK;
}
void TCPServerSocket::OnAcceptCompleted(
std::unique_ptr<StreamSocket>* output_accepted_socket,
IPEndPoint* output_accepted_address,
CompletionOnceCallback forward_callback,
int result) {
result = ConvertAcceptedSocket(result, output_accepted_socket,
output_accepted_address);
pending_accept_ = false;
std::move(forward_callback).Run(result);
}
} // namespace net
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