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_(nullptr),
  64       clipboard_stub_(nullptr),
  65       parser_(base::Bind(&ClientControlDispatcher::OnMessageReceived,
  66                          base::Unretained(this)),
  67               reader()) {
  68 }
  69
  70 ClientControlDispatcher::~ClientControlDispatcher() {
  71 }
  72
  73 void ClientControlDispatcher::InjectClipboardEvent(
  74     const ClipboardEvent& event) {
  75   ControlMessage message;
  76   message.mutable_clipboard_event()->CopyFrom(event);
  77   writer()->Write(SerializeAndFrameMessage(message), base::Closure());
  78 }
  79
  80 void ClientControlDispatcher::NotifyClientResolution(
  81     const ClientResolution& resolution) {
  82   ControlMessage message;
  83   message.mutable_client_resolution()->CopyFrom(resolution);
  84   writer()->Write(SerializeAndFrameMessage(message), base::Closure());
  85 }
  86
  87 void ClientControlDispatcher::ControlVideo(const VideoControl& video_control) {
  88   ControlMessage message;
  89   message.mutable_video_control()->CopyFrom(video_control);
  90   writer()->Write(SerializeAndFrameMessage(message), base::Closure());
  91 }
  92
  93 void ClientControlDispatcher::ControlAudio(const AudioControl& audio_control) {
  94   ControlMessage message;
  95   message.mutable_audio_control()->CopyFrom(audio_control);
  96   writer()->Write(SerializeAndFrameMessage(message), base::Closure());
  97 }
  98
  99 void ClientControlDispatcher::SetCapabilities(
 100     const Capabilities& capabilities) {
 101   ControlMessage message;
 102   message.mutable_capabilities()->CopyFrom(capabilities);
 103   writer()->Write(SerializeAndFrameMessage(message), base::Closure());
 104 }
 105
 106 void ClientControlDispatcher::RequestPairing(
 107     const PairingRequest& pairing_request) {
 108   ControlMessage message;
 109   message.mutable_pairing_request()->CopyFrom(pairing_request);
 110   writer()->Write(SerializeAndFrameMessage(message), base::Closure());
 111 }
 112
 113 void ClientControlDispatcher::DeliverClientMessage(
 114     const ExtensionMessage& message) {
 115   ControlMessage control_message;
 116   control_message.mutable_extension_message()->CopyFrom(message);
 117   writer()->Write(SerializeAndFrameMessage(control_message), base::Closure());
 118 }
 119
 120 void ClientControlDispatcher::OnMessageReceived(
 121     scoped_ptr<ControlMessage> message,
 122     const base::Closure& done_task) {
 123   DCHECK(client_stub_);
 124   DCHECK(clipboard_stub_);
 125   base::ScopedClosureRunner done_runner(done_task);
 126
 127   if (message->has_clipboard_event()) {
 128     clipboard_stub_->InjectClipboardEvent(message->clipboard_event());
 129   } else if (message->has_capabilities()) {
 130     client_stub_->SetCapabilities(message->capabilities());
 131   } else if (message->has_cursor_shape()) {
 132     if (CursorShapeIsValid(message->cursor_shape()))
 133       client_stub_->SetCursorShape(message->cursor_shape());
 134   } else if (message->has_pairing_response()) {
 135     client_stub_->SetPairingResponse(message->pairing_response());
 136   } else if (message->has_extension_message()) {
 137     client_stub_->DeliverHostMessage(message->extension_message());
 138   } else {
 139     LOG(WARNING) << "Unknown control message received.";
 140   }
 141 }
 142
 143 }  // namespace protocol
 144 }  // namespace remoting