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
18namespace remoting {
19namespace protocol {
20
21namespace {
22
23// 32-bit BGRA is 4 bytes per pixel.
24const int kBytesPerPixel = 4;
25
26bool 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
61ClientControlDispatcher::ClientControlDispatcher()
62    : ChannelDispatcherBase(kControlChannelName),
63      client_stub_(NULL),
64      clipboard_stub_(NULL) {
65}
66
67ClientControlDispatcher::~ClientControlDispatcher() {
68  writer_.Close();
69}
70
71void 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
78void 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
85void 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
92void 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
98void 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
104void ClientControlDispatcher::SetCapabilities(
105    const Capabilities& capabilities) {
106  ControlMessage message;
107  message.mutable_capabilities()->CopyFrom(capabilities);
108  writer_.Write(SerializeAndFrameMessage(message), base::Closure());
109}
110
111void 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
118void 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
125void 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