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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/390223051): Remove C-library calls to fix the errors.
#pragma allow_unsafe_libc_calls
#endif
#include "remoting/protocol/channel_socket_adapter.h"
#include <limits>
#include "base/functional/callback.h"
#include "base/logging.h"
#include "net/base/io_buffer.h"
#include "net/base/net_errors.h"
namespace remoting::protocol {
TransportChannelSocketAdapter::TransportChannelSocketAdapter(
webrtc::IceTransportInternal* ice_transport)
: channel_(ice_transport) {
DCHECK(channel_);
channel_->RegisterReceivedPacketCallback(
this, [&](webrtc::PacketTransportInternal* transport,
const webrtc::ReceivedIpPacket& packet) {
OnNewPacket(transport, packet);
});
channel_->SignalWritableState.connect(
this, &TransportChannelSocketAdapter::OnWritableState);
channel_->SignalDestroyed.connect(
this, &TransportChannelSocketAdapter::OnChannelDestroyed);
}
TransportChannelSocketAdapter::~TransportChannelSocketAdapter() {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
if (destruction_callback_) {
std::move(destruction_callback_).Run();
}
if (channel_) {
// Channel may still exist in unit tests. We must deregister packet callback
// in order to prevent callbacks after destruction.
channel_->DeregisterReceivedPacketCallback(this);
}
}
void TransportChannelSocketAdapter::SetOnDestroyedCallback(
base::OnceClosure callback) {
destruction_callback_ = std::move(callback);
}
int TransportChannelSocketAdapter::Recv(
const scoped_refptr<net::IOBuffer>& buf,
int buffer_size,
const net::CompletionRepeatingCallback& callback) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
DCHECK(buf);
DCHECK(!callback.is_null());
CHECK(read_callback_.is_null());
if (!channel_) {
DCHECK(closed_error_code_ != net::OK);
return closed_error_code_;
}
read_callback_ = callback;
read_buffer_ = buf;
read_buffer_size_ = buffer_size;
return net::ERR_IO_PENDING;
}
int TransportChannelSocketAdapter::Send(
const scoped_refptr<net::IOBuffer>& buffer,
int buffer_size,
const net::CompletionRepeatingCallback& callback) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
DCHECK(buffer);
DCHECK(!callback.is_null());
CHECK(write_callback_.is_null());
if (!channel_) {
DCHECK(closed_error_code_ != net::OK);
return closed_error_code_;
}
int result;
webrtc::AsyncSocketPacketOptions options;
if (channel_->writable()) {
result = channel_->SendPacket(buffer->data(), buffer_size, options);
if (result < 0) {
result = net::MapSystemError(channel_->GetError());
// If the underlying socket returns IO pending where it shouldn't we
// pretend the packet is dropped and return as succeeded because no
// writeable callback will happen.
if (result == net::ERR_IO_PENDING) {
result = net::OK;
}
}
} else {
// Channel is not writable yet.
result = net::ERR_IO_PENDING;
write_callback_ = callback;
write_buffer_ = buffer;
write_buffer_size_ = buffer_size;
}
return result;
}
void TransportChannelSocketAdapter::Close(int error_code) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
if (!channel_) { // Already closed.
return;
}
DCHECK(error_code != net::OK);
closed_error_code_ = error_code;
channel_->DeregisterReceivedPacketCallback(this);
channel_->SignalDestroyed.disconnect(this);
channel_ = nullptr;
if (!read_callback_.is_null()) {
net::CompletionRepeatingCallback callback = read_callback_;
read_callback_.Reset();
read_buffer_.reset();
callback.Run(error_code);
}
if (!write_callback_.is_null()) {
net::CompletionRepeatingCallback callback = write_callback_;
write_callback_.Reset();
write_buffer_.reset();
callback.Run(error_code);
}
}
void TransportChannelSocketAdapter::OnNewPacket(
webrtc::PacketTransportInternal* transport,
const webrtc::ReceivedIpPacket& packet) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
DCHECK_EQ(transport, channel_);
if (!read_callback_.is_null()) {
DCHECK(read_buffer_.get());
CHECK_LT(packet.payload().size(),
static_cast<size_t>(std::numeric_limits<int>::max()));
size_t data_size = packet.payload().size();
if (read_buffer_size_ < static_cast<int>(data_size)) {
LOG(WARNING) << "Data buffer is smaller than the received packet. "
<< "Dropping the data that doesn't fit.";
data_size = read_buffer_size_;
}
memcpy(read_buffer_->data(), packet.payload().data(), data_size);
net::CompletionRepeatingCallback callback = read_callback_;
read_callback_.Reset();
read_buffer_.reset();
callback.Run(data_size);
} else {
LOG(WARNING)
<< "Data was received without a callback. Dropping the packet.";
}
}
void TransportChannelSocketAdapter::OnWritableState(
webrtc::PacketTransportInternal* transport) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
// Try to send the packet if there is a pending write.
if (!write_callback_.is_null()) {
webrtc::AsyncSocketPacketOptions options;
int result = channel_->SendPacket(write_buffer_->data(), write_buffer_size_,
options);
if (result < 0) {
result = net::MapSystemError(channel_->GetError());
}
if (result != net::ERR_IO_PENDING) {
net::CompletionRepeatingCallback callback = write_callback_;
write_callback_.Reset();
write_buffer_.reset();
callback.Run(result);
}
}
}
void TransportChannelSocketAdapter::OnChannelDestroyed(
webrtc::IceTransportInternal* channel) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
DCHECK_EQ(channel, channel_);
Close(net::ERR_CONNECTION_ABORTED);
}
} // namespace remoting::protocol
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