Chromoting: Implemented security attention sequence (SAS) emulation on Windows.

remoting/host/event_executor_win.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "remoting/host/event_executor.h"
 
 #include <windows.h>
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/message_loop.h"
+#include "ipc/ipc_channel_proxy.h"
 #include "remoting/host/capturer.h"
 #include "remoting/proto/event.pb.h"
 #include "ui/base/keycodes/keyboard_codes.h"
 
+#include "remoting/host/chromoting_session_messages.h"
+
 namespace remoting {
 
 using protocol::MouseEvent;
 using protocol::KeyEvent;
 
 namespace {
 
+// Name of the chromoting service IPC channel.
+const char kChromotingSessionChannelName[] = "chromoting_session";
+
 // A class to generate events on Windows.
 class EventExecutorWin : public EventExecutor {
  public:
-  EventExecutorWin(MessageLoop* message_loop, Capturer* capturer);
+  EventExecutorWin(MessageLoop* message_loop,
+                   IPC::ChannelProxy* chromoting_session,
+                   Capturer* capturer);
   virtual ~EventExecutorWin() {}
 
   virtual void InjectKeyEvent(const KeyEvent& event) OVERRIDE;
   virtual void InjectMouseEvent(const MouseEvent& event) OVERRIDE;
 
  private:
   void HandleKey(const KeyEvent& event);
   void HandleMouse(const MouseEvent& event);
 
   MessageLoop* message_loop_;
   Capturer* capturer_;
 
+  // IPC channel connecting the host with the chromoting service.
+  IPC::ChannelProxy* chromoting_session_;
+
+  bool scroll_pressed_;
+
   DISALLOW_COPY_AND_ASSIGN(EventExecutorWin);
 };
 
 EventExecutorWin::EventExecutorWin(MessageLoop* message_loop,
+                                   IPC::ChannelProxy* chromoting_session,
                                    Capturer* capturer)
     : message_loop_(message_loop),
-      capturer_(capturer) {
+      capturer_(capturer),
+      chromoting_session_(chromoting_session),
+      scroll_pressed_(false) {
 }
 
 void EventExecutorWin::InjectKeyEvent(const KeyEvent& event) {
   if (MessageLoop::current() != message_loop_) {
     message_loop_->PostTask(
         FROM_HERE,
         base::Bind(&EventExecutorWin::InjectKeyEvent, base::Unretained(this),
                    event));
     return;
   }
 
+  // Poor man's Ctrl+Alt+Delete emulation: a double Scroll Lock is converted to
+  // the security attention sequence.
+  // TODO(alexeypa): replace this with proper SAS handling.
+  if (chromoting_session_ != NULL && event.keycode() == VK_SCROLL) {
+    if (event.pressed()) {
+      if (scroll_pressed_) {
+        chromoting_session_->Send(new ChromotingSessionMsg_SendSasToConsole());
+        scroll_pressed_ = false;
+      } else {
+        scroll_pressed_ = true;
+      }
+    }
+  } else {
+    scroll_pressed_ = false;
+  }
+
   HandleKey(event);
 }
 
 void EventExecutorWin::InjectMouseEvent(const MouseEvent& event) {
   if (MessageLoop::current() != message_loop_) {
     message_loop_->PostTask(
         FROM_HERE,
         base::Bind(&EventExecutorWin::InjectMouseEvent, base::Unretained(this),
                    event));
     return;
@@ skipping 94 matching lines @@
           down ? MOUSEEVENTF_LEFTDOWN : MOUSEEVENTF_LEFTUP;
     }
 
     SendInput(1, &button_event, sizeof(INPUT));
   }
 }
 
 }  // namespace
 
 EventExecutor* EventExecutor::Create(MessageLoop* message_loop,
+                                     IPC::ChannelProxy* chromoting_session,
                                      Capturer* capturer) {
-  return new EventExecutorWin(message_loop, capturer);
+  return new EventExecutorWin(message_loop, chromoting_session, capturer);
 }
 
 }  // namespace remoting