| // Copyright 2015 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "remoting/protocol/quic_channel.h" |
| |
| #include "base/callback_helpers.h" |
| #include "net/base/io_buffer.h" |
| #include "net/base/net_errors.h" |
| |
| namespace remoting { |
| namespace protocol { |
| |
| static const size_t kNamePrefixLength = 1; |
| static const size_t kMaxNameLength = 255; |
| |
| QuicChannel::QuicChannel(net::QuicP2PStream* stream, |
| const base::Closure& on_destroyed_callback) |
| : stream_(stream), on_destroyed_callback_(on_destroyed_callback) { |
| DCHECK(stream_); |
| stream_->SetDelegate(this); |
| } |
| |
| QuicChannel::~QuicChannel() { |
| // Don't call the read callback when destroying the stream. |
| read_callback_.Reset(); |
| |
| on_destroyed_callback_.Run(); |
| |
| // The callback must destroy the stream which must result in OnClose(). |
| DCHECK(!stream_); |
| } |
| |
| int QuicChannel::Read(const scoped_refptr<net::IOBuffer>& buffer, |
| int buffer_len, |
| const net::CompletionCallback& callback) { |
| DCHECK(read_callback_.is_null()); |
| |
| if (error_ != net::OK) |
| return error_; |
| |
| if (data_received_.total_bytes() == 0) { |
| read_buffer_ = buffer; |
| read_buffer_size_ = buffer_len; |
| read_callback_ = callback; |
| return net::ERR_IO_PENDING; |
| } |
| |
| int result = std::min(buffer_len, data_received_.total_bytes()); |
| data_received_.CopyTo(buffer->data(), result); |
| data_received_.CropFront(result); |
| return result; |
| } |
| |
| int QuicChannel::Write(const scoped_refptr<net::IOBuffer>& buffer, |
| int buffer_len, |
| const net::CompletionCallback& callback) { |
| if (error_ != net::OK) |
| return error_; |
| |
| return stream_->Write(base::StringPiece(buffer->data(), buffer_len), |
| callback); |
| } |
| |
| void QuicChannel::SetName(const std::string& name) { |
| DCHECK(name_.empty()); |
| |
| name_ = name; |
| } |
| |
| void QuicChannel::OnDataReceived(const char* data, int length) { |
| if (read_callback_.is_null()) { |
| data_received_.AppendCopyOf(data, length); |
| return; |
| } |
| |
| DCHECK_EQ(data_received_.total_bytes(), 0); |
| int bytes_to_read = std::min(length, read_buffer_size_); |
| memcpy(read_buffer_->data(), data, bytes_to_read); |
| read_buffer_ = nullptr; |
| |
| // Copy leftover data to |data_received_|. |
| if (length > bytes_to_read) |
| data_received_.AppendCopyOf(data + bytes_to_read, length - bytes_to_read); |
| |
| base::ResetAndReturn(&read_callback_).Run(bytes_to_read); |
| } |
| |
| void QuicChannel::OnClose(net::QuicErrorCode error) { |
| error_ = (error == net::QUIC_NO_ERROR) ? net::ERR_CONNECTION_CLOSED |
| : net::ERR_QUIC_PROTOCOL_ERROR; |
| stream_ = nullptr; |
| if (!read_callback_.is_null()) { |
| base::ResetAndReturn(&read_callback_).Run(error_); |
| } |
| } |
| |
| QuicClientChannel::QuicClientChannel(net::QuicP2PStream* stream, |
| const base::Closure& on_destroyed_callback, |
| const std::string& name) |
| : QuicChannel(stream, on_destroyed_callback) { |
| CHECK_LE(name.size(), kMaxNameLength); |
| |
| SetName(name); |
| |
| // Send the name to the host. |
| stream_->WriteHeader( |
| std::string(kNamePrefixLength, static_cast<char>(name.size())) + name); |
| } |
| |
| QuicClientChannel::~QuicClientChannel() {} |
| |
| QuicServerChannel::QuicServerChannel( |
| net::QuicP2PStream* stream, |
| const base::Closure& on_destroyed_callback) |
| : QuicChannel(stream, on_destroyed_callback) {} |
| |
| void QuicServerChannel::ReceiveName( |
| const base::Closure& name_received_callback) { |
| name_received_callback_ = name_received_callback; |
| |
| // First read 1 byte containing name length. |
| name_read_buffer_ = new net::DrainableIOBuffer( |
| new net::IOBuffer(kNamePrefixLength), kNamePrefixLength); |
| int result = Read(name_read_buffer_, kNamePrefixLength, |
| base::Bind(&QuicServerChannel::OnNameSizeReadResult, |
| base::Unretained(this))); |
| if (result != net::ERR_IO_PENDING) |
| OnNameSizeReadResult(result); |
| } |
| |
| QuicServerChannel::~QuicServerChannel() {} |
| |
| void QuicServerChannel::OnNameSizeReadResult(int result) { |
| if (result < 0) { |
| base::ResetAndReturn(&name_received_callback_).Run(); |
| return; |
| } |
| |
| DCHECK_EQ(result, static_cast<int>(kNamePrefixLength)); |
| name_length_ = *reinterpret_cast<uint8_t*>(name_read_buffer_->data()); |
| name_read_buffer_ = |
| new net::DrainableIOBuffer(new net::IOBuffer(name_length_), name_length_); |
| ReadNameLoop(0); |
| } |
| |
| void QuicServerChannel::ReadNameLoop(int result) { |
| while (result >= 0 && name_read_buffer_->BytesRemaining() > 0) { |
| result = Read(name_read_buffer_, name_read_buffer_->BytesRemaining(), |
| base::Bind(&QuicServerChannel::OnNameReadResult, |
| base::Unretained(this))); |
| if (result >= 0) { |
| name_read_buffer_->DidConsume(result); |
| } |
| } |
| |
| if (result < 0 && result != net::ERR_IO_PENDING) { |
| // Failed to read name for the stream. |
| base::ResetAndReturn(&name_received_callback_).Run(); |
| return; |
| } |
| |
| if (name_read_buffer_->BytesRemaining() == 0) { |
| name_read_buffer_->SetOffset(0); |
| SetName(std::string(name_read_buffer_->data(), |
| name_read_buffer_->data() + name_length_)); |
| base::ResetAndReturn(&name_received_callback_).Run(); |
| } |
| } |
| |
| void QuicServerChannel::OnNameReadResult(int result) { |
| if (result > 0) |
| name_read_buffer_->DidConsume(result); |
| |
| ReadNameLoop(result); |
| } |
| |
| } // namespace protocol |
| } // namespace remoting |