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      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
    149