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
CursorShapeIsValid(const CursorShapeInfo & cursor_shape)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
ClientControlDispatcher()61 ClientControlDispatcher::ClientControlDispatcher()
62 : ChannelDispatcherBase(kControlChannelName),
63 client_stub_(NULL),
64 clipboard_stub_(NULL) {
65 }
66
~ClientControlDispatcher()67 ClientControlDispatcher::~ClientControlDispatcher() {
68 writer_.Close();
69 }
70
OnInitialized()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
InjectClipboardEvent(const ClipboardEvent & event)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
NotifyClientResolution(const ClientResolution & resolution)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
ControlVideo(const VideoControl & video_control)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
ControlAudio(const AudioControl & audio_control)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
SetCapabilities(const Capabilities & capabilities)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
RequestPairing(const PairingRequest & pairing_request)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
DeliverClientMessage(const ExtensionMessage & message)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
OnMessageReceived(scoped_ptr<ControlMessage> message,const base::Closure & done_task)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