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