remoting/protocol/client_control_dispatcher.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "remoting/protocol/client_control_dispatcher.h"
   6
   7 #include "base/bind_helpers.h"
   8 #include "base/callback.h"
   9 #include "base/callback_helpers.h"
  10 #include "base/message_loop/message_loop_proxy.h"
  11 #include "net/socket/stream_socket.h"
  12 #include "remoting/base/constants.h"
  13 #include "remoting/proto/control.pb.h"
  14 #include "remoting/proto/internal.pb.h"
  15 #include "remoting/protocol/client_stub.h"
  16 #include "remoting/protocol/message_serialization.h"
  17
  18 namespace remoting {
  19 namespace protocol {
  20
  21 namespace {
  22
  23 // 32-bit BGRA is 4 bytes per pixel.
  24 const int kBytesPerPixel = 4;
  25
  26 bool CursorShapeIsValid(const CursorShapeInfo& cursor_shape) {
  27   if (!cursor_shape.has_data() ||
  28       !cursor_shape.has_width() ||
  29       !cursor_shape.has_height() ||
  30       !cursor_shape.has_hotspot_x() ||
  31       !cursor_shape.has_hotspot_y()) {
  32     LOG(ERROR) << "Cursor shape is missing required fields.";
  33     return false;
  34   }
  35
  36   int width = cursor_shape.width();
  37   int height = cursor_shape.height();
  38
  39   // Verify that |width| and |height| are within sane limits. Otherwise integer
  40   // overflow can occur while calculating |cursor_total_bytes| below.
  41   if (width <= 0 || width > (SHRT_MAX / 2) ||
  42       height <= 0 || height > (SHRT_MAX / 2)) {
  43     LOG(ERROR) << "Cursor dimensions are out of bounds for SetCursor: "
  44                << width << "x" << height;
  45     return false;
  46   }
  47
  48   uint32 cursor_total_bytes = width * height * kBytesPerPixel;
  49   if (cursor_shape.data().size() < cursor_total_bytes) {
  50     LOG(ERROR) << "Expected " << cursor_total_bytes << " bytes for a "
  51                << width << "x" << height << " cursor. Only received "
  52                << cursor_shape.data().size() << " bytes";
  53     return false;
  54   }
  55
  56   return true;
  57 }
  58
  59 }  // namespace
  60
  61 ClientControlDispatcher::ClientControlDispatcher()
  62     : ChannelDispatcherBase(kControlChannelName),
  63       client_stub_(NULL),
  64       clipboard_stub_(NULL) {
  65 }
  66
  67 ClientControlDispatcher::~ClientControlDispatcher() {
  68   writer_.Close();
  69 }
  70
  71 void ClientControlDispatcher::OnInitialized() {
  72   // TODO(garykac): Set write failed callback.
  73   writer_.Init(channel(), BufferedSocketWriter::WriteFailedCallback());
  74   reader_.Init(channel(), base::Bind(
  75       &ClientControlDispatcher::OnMessageReceived, base::Unretained(this)));
  76 }
  77
  78 void ClientControlDispatcher::InjectClipboardEvent(
  79     const ClipboardEvent& event) {
  80   ControlMessage message;
  81   message.mutable_clipboard_event()->CopyFrom(event);
  82   writer_.Write(SerializeAndFrameMessage(message), base::Closure());
  83 }
  84
  85 void ClientControlDispatcher::NotifyClientResolution(
  86     const ClientResolution& resolution) {
  87   ControlMessage message;
  88   message.mutable_client_resolution()->CopyFrom(resolution);
  89   writer_.Write(SerializeAndFrameMessage(message), base::Closure());
  90 }
  91
  92 void ClientControlDispatcher::ControlVideo(const VideoControl& video_control) {
  93   ControlMessage message;
  94   message.mutable_video_control()->CopyFrom(video_control);
  95   writer_.Write(SerializeAndFrameMessage(message), base::Closure());
  96 }
  97
  98 void ClientControlDispatcher::ControlAudio(const AudioControl& audio_control) {
  99   ControlMessage message;
 100   message.mutable_audio_control()->CopyFrom(audio_control);
 101   writer_.Write(SerializeAndFrameMessage(message), base::Closure());
 102 }
 103
 104 void ClientControlDispatcher::SetCapabilities(
 105     const Capabilities& capabilities) {
 106   ControlMessage message;
 107   message.mutable_capabilities()->CopyFrom(capabilities);
 108   writer_.Write(SerializeAndFrameMessage(message), base::Closure());
 109 }
 110
 111 void ClientControlDispatcher::RequestPairing(
 112     const PairingRequest& pairing_request) {
 113   ControlMessage message;
 114   message.mutable_pairing_request()->CopyFrom(pairing_request);
 115   writer_.Write(SerializeAndFrameMessage(message), base::Closure());
 116 }
 117
 118 void ClientControlDispatcher::DeliverClientMessage(
 119     const ExtensionMessage& message) {
 120   ControlMessage control_message;
 121   control_message.mutable_extension_message()->CopyFrom(message);
 122   writer_.Write(SerializeAndFrameMessage(control_message), base::Closure());
 123 }
 124
 125 void ClientControlDispatcher::OnMessageReceived(
 126     scoped_ptr<ControlMessage> message, const base::Closure& done_task) {
 127   DCHECK(client_stub_);
 128   DCHECK(clipboard_stub_);
 129   base::ScopedClosureRunner done_runner(done_task);
 130
 131   if (message->has_clipboard_event()) {
 132     clipboard_stub_->InjectClipboardEvent(message->clipboard_event());
 133   } else if (message->has_capabilities()) {
 134     client_stub_->SetCapabilities(message->capabilities());
 135   } else if (message->has_cursor_shape()) {
 136     if (CursorShapeIsValid(message->cursor_shape()))
 137       client_stub_->SetCursorShape(message->cursor_shape());
 138   } else if (message->has_pairing_response()) {
 139     client_stub_->SetPairingResponse(message->pairing_response());
 140   } else if (message->has_extension_message()) {
 141     client_stub_->DeliverHostMessage(message->extension_message());
 142   } else {
 143     LOG(WARNING) << "Unknown control message received.";
 144   }
 145 }
 146
 147 }  // namespace protocol
 148 }  // namespace remoting