[Chromoting] Call SendSAS() directly from the host.

remoting/host/session_event_executor_win.cc

 // Copyright (c) 2012 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/session_event_executor_win.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/single_thread_task_runner.h"
 #include "base/win/windows_version.h"
 #include "ipc/ipc_channel.h"
 #include "ipc/ipc_channel_proxy.h"
 #include "remoting/host/chromoting_messages.h"
+#include "remoting/host/sas_injector.h"
 #include "remoting/host/win/desktop.h"
-#include "remoting/host/win/scoped_thread_desktop.h"
 #include "remoting/proto/event.pb.h"
 
 namespace {
 
-// The command line switch specifying the name of the Chromoting IPC channel.
-const char kProcessChannelId[] = "chromoting-ipc";
-
 const uint32 kUsbLeftControl =  0x0700e0;
 const uint32 kUsbRightControl = 0x0700e4;
 const uint32 kUsbLeftAlt =  0x0700e2;
 const uint32 kUsbRightAlt = 0x0700e6;
 const uint32 kUsbDelete = 0x07004c;
 
 bool CheckCtrlAndAltArePressed(const std::set<uint32>& pressed_keys) {
   size_t ctrl_keys = pressed_keys.count(kUsbLeftControl) +
     pressed_keys.count(kUsbRightControl);
   size_t alt_keys = pressed_keys.count(kUsbLeftAlt) +
     pressed_keys.count(kUsbRightAlt);
   return ctrl_keys != 0 && alt_keys != 0 &&
     (ctrl_keys + alt_keys == pressed_keys.size());
 }
 
-// Emulates Secure Attention Sequence (Ctrl+Alt+Del) by switching to
-// the Winlogon desktop and injecting Ctrl+Alt+Del as a hot key.
-// N.B. Windows XP/W2K3 only.
-void EmulateSecureAttentionSequence() {
-  const wchar_t kWinlogonDesktopName[] = L"Winlogon";
-  const wchar_t kSasWindowClassName[] = L"SAS window class";
-  const wchar_t kSasWindowTitle[] = L"SAS window";
-
-  scoped_ptr<remoting::Desktop> winlogon_desktop(
-      remoting::Desktop::GetDesktop(kWinlogonDesktopName));
-  if (!winlogon_desktop.get())
-    return;
-
-  remoting::ScopedThreadDesktop desktop;
-  if (!desktop.SetThreadDesktop(winlogon_desktop.Pass()))
-    return;
-
-  HWND window = FindWindow(kSasWindowClassName, kSasWindowTitle);
-  if (!window)
-    return;
-
-  PostMessage(window,
-              WM_HOTKEY,
-              0,
-              MAKELONG(MOD_ALT | MOD_CONTROL, VK_DELETE));
-}
-
 } // namespace
 
 namespace remoting {
 
 using protocol::ClipboardEvent;
 using protocol::MouseEvent;
 using protocol::KeyEvent;
 
 SessionEventExecutorWin::SessionEventExecutorWin(
     scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
     scoped_refptr<base::SingleThreadTaskRunner> io_task_runner,
     scoped_ptr<EventExecutor> nested_executor)
     : nested_executor_(nested_executor.Pass()),
       task_runner_(main_task_runner),
       ALLOW_THIS_IN_INITIALIZER_LIST(weak_ptr_factory_(this)),
       weak_ptr_(weak_ptr_factory_.GetWeakPtr()) {
   // Let |weak_ptr_| be used on the |task_runner_| thread.
   // |weak_ptr_| and |weak_ptr_factory_| share a ThreadChecker, so the
   // following line affects both of them.
   weak_ptr_factory_.DetachFromThread();
-
-  std::string channel_name =
-      CommandLine::ForCurrentProcess()->GetSwitchValueASCII(kProcessChannelId);
-
-  // Connect to the Chromoting IPC channel if the name was passed in the command
-  // line.
-  if (!channel_name.empty()) {
-    chromoting_channel_.reset(new IPC::ChannelProxy(
-        channel_name, IPC::Channel::MODE_CLIENT, this, io_task_runner));
-  }
 }
 
 SessionEventExecutorWin::~SessionEventExecutorWin() {
 }
 
 void SessionEventExecutorWin::OnSessionStarted(
     scoped_ptr<protocol::ClipboardStub> client_clipboard) {
   if (!task_runner_->BelongsToCurrentThread()) {
     task_runner_->PostTask(
         FROM_HERE,
@@ skipping 42 matching lines @@
   // HostEventDispatcher should drop events lacking the pressed field.
   DCHECK(event.has_pressed());
 
   if (event.has_usb_keycode()) {
     if (event.pressed()) {
       // Simulate secure attention sequence if Ctrl-Alt-Del was just pressed.
       if (event.usb_keycode() == kUsbDelete &&
           CheckCtrlAndAltArePressed(pressed_keys_)) {
         VLOG(3) << "Sending Secure Attention Sequence to console";
 
-        if (base::win::GetVersion() == base::win::VERSION_XP) {
-          EmulateSecureAttentionSequence();
-        } else if (chromoting_channel_.get()) {
-          chromoting_channel_->Send(new ChromotingHostMsg_SendSasToConsole());
-        }
+        if (sas_injector_.get() == NULL)
+          sas_injector_ = SasInjector::Create();
+        sas_injector_->InjectSas();
       }
 
       pressed_keys_.insert(event.usb_keycode());
     } else {
       pressed_keys_.erase(event.usb_keycode());
     }
   }
 
   SwitchToInputDesktop();
   nested_executor_->InjectKeyEvent(event);
 }
 
 void SessionEventExecutorWin::InjectMouseEvent(const MouseEvent& event) {
   if (!task_runner_->BelongsToCurrentThread()) {
     task_runner_->PostTask(
         FROM_HERE,
         base::Bind(&SessionEventExecutorWin::InjectMouseEvent,
                    weak_ptr_, event));
     return;
   }
 
   SwitchToInputDesktop();
   nested_executor_->InjectMouseEvent(event);
 }
 
-bool SessionEventExecutorWin::OnMessageReceived(const IPC::Message& message) {
-  return false;
-}
-
 void SessionEventExecutorWin::SwitchToInputDesktop() {
   // Switch to the desktop receiving user input if different from the current
   // one.
   scoped_ptr<Desktop> input_desktop = Desktop::GetInputDesktop();
   if (input_desktop.get() != NULL && !desktop_.IsSame(*input_desktop)) {
     // If SetThreadDesktop() fails, the thread is still assigned a desktop.
     // So we can continue capture screen bits, just from a diffected desktop.
     desktop_.SetThreadDesktop(input_desktop.Pass());
   }
 }
 
 }  // namespace remoting