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/*
* Copyright 2004 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "rtc_base/async_udp_socket.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
#include "rtc_base/network/sent_packet.h"
#include "rtc_base/time_utils.h"
#include "system_wrappers/include/field_trial.h"
namespace rtc {
// Returns true if the experiement "WebRTC-SCM-Timestamp" is explicitly
// disabled.
static bool IsScmTimeStampExperimentDisabled() {
return webrtc::field_trial::IsDisabled("WebRTC-SCM-Timestamp");
}
AsyncUDPSocket* AsyncUDPSocket::Create(Socket* socket,
const SocketAddress& bind_address) {
std::unique_ptr<Socket> owned_socket(socket);
if (socket->Bind(bind_address) < 0) {
RTC_LOG(LS_ERROR) << "Bind() failed with error " << socket->GetError();
return nullptr;
}
return new AsyncUDPSocket(owned_socket.release());
}
AsyncUDPSocket* AsyncUDPSocket::Create(SocketFactory* factory,
const SocketAddress& bind_address) {
Socket* socket = factory->CreateSocket(bind_address.family(), SOCK_DGRAM);
if (!socket)
return nullptr;
return Create(socket, bind_address);
}
AsyncUDPSocket::AsyncUDPSocket(Socket* socket) : socket_(socket) {
sequence_checker_.Detach();
// The socket should start out readable but not writable.
socket_->SignalReadEvent.connect(this, &AsyncUDPSocket::OnReadEvent);
socket_->SignalWriteEvent.connect(this, &AsyncUDPSocket::OnWriteEvent);
}
SocketAddress AsyncUDPSocket::GetLocalAddress() const {
return socket_->GetLocalAddress();
}
SocketAddress AsyncUDPSocket::GetRemoteAddress() const {
return socket_->GetRemoteAddress();
}
int AsyncUDPSocket::Send(const void* pv,
size_t cb,
const rtc::PacketOptions& options) {
rtc::SentPacket sent_packet(options.packet_id, rtc::TimeMillis(),
options.info_signaled_after_sent);
CopySocketInformationToPacketInfo(cb, *this, false, &sent_packet.info);
int ret = socket_->Send(pv, cb);
SignalSentPacket(this, sent_packet);
return ret;
}
int AsyncUDPSocket::SendTo(const void* pv,
size_t cb,
const SocketAddress& addr,
const rtc::PacketOptions& options) {
rtc::SentPacket sent_packet(options.packet_id, rtc::TimeMillis(),
options.info_signaled_after_sent);
CopySocketInformationToPacketInfo(cb, *this, true, &sent_packet.info);
int ret = socket_->SendTo(pv, cb, addr);
SignalSentPacket(this, sent_packet);
return ret;
}
int AsyncUDPSocket::Close() {
return socket_->Close();
}
AsyncUDPSocket::State AsyncUDPSocket::GetState() const {
return STATE_BOUND;
}
int AsyncUDPSocket::GetOption(Socket::Option opt, int* value) {
return socket_->GetOption(opt, value);
}
int AsyncUDPSocket::SetOption(Socket::Option opt, int value) {
return socket_->SetOption(opt, value);
}
int AsyncUDPSocket::GetError() const {
return socket_->GetError();
}
void AsyncUDPSocket::SetError(int error) {
return socket_->SetError(error);
}
void AsyncUDPSocket::OnReadEvent(Socket* socket) {
RTC_DCHECK(socket_.get() == socket);
RTC_DCHECK_RUN_ON(&sequence_checker_);
SocketAddress remote_addr;
int64_t timestamp = -1;
int len = socket_->RecvFrom(buf_, BUF_SIZE, &remote_addr, ×tamp);
if (len < 0) {
// An error here typically means we got an ICMP error in response to our
// send datagram, indicating the remote address was unreachable.
// When doing ICE, this kind of thing will often happen.
// TODO: Do something better like forwarding the error to the user.
SocketAddress local_addr = socket_->GetLocalAddress();
RTC_LOG(LS_INFO) << "AsyncUDPSocket[" << local_addr.ToSensitiveString()
<< "] receive failed with error " << socket_->GetError();
return;
}
if (timestamp == -1) {
// Timestamp from socket is not available.
timestamp = TimeMicros();
} else {
if (!socket_time_offset_) {
socket_time_offset_ =
!IsScmTimeStampExperimentDisabled() ? TimeMicros() - timestamp : 0;
}
timestamp += *socket_time_offset_;
}
// TODO: Make sure that we got all of the packet.
// If we did not, then we should resize our buffer to be large enough.
NotifyPacketReceived(
rtc::ReceivedPacket::CreateFromLegacy(buf_, len, timestamp, remote_addr));
}
void AsyncUDPSocket::OnWriteEvent(Socket* socket) {
SignalReadyToSend(this);
}
} // namespace rtc
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