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// 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/message_loop.h"
#include "base/win/windows_version.h"
#include "ipc/ipc_channel.h"
#include "ipc/ipc_channel_proxy.h"
#include "remoting/proto/event.pb.h"
#include "remoting/host/chromoting_messages.h"
#include "remoting/host/desktop_win.h"
#include "remoting/host/scoped_thread_desktop_win.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 areCtrlAndAltPressed(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::DesktopWin> winlogon_desktop(
remoting::DesktopWin::GetDesktop(kWinlogonDesktopName));
if (!winlogon_desktop.get())
return;
remoting::ScopedThreadDesktopWin 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(
MessageLoop* message_loop,
base::MessageLoopProxy* io_message_loop,
scoped_ptr<EventExecutor> nested_executor)
: nested_executor_(nested_executor.Pass()),
message_loop_(message_loop),
ALLOW_THIS_IN_INITIALIZER_LIST(weak_ptr_factory_(this)),
weak_ptr_(weak_ptr_factory_.GetWeakPtr()) {
// Let weak_ptr_ be used on the message_loop_ 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_message_loop));
}
}
SessionEventExecutorWin::~SessionEventExecutorWin() {
DCHECK(MessageLoop::current() == message_loop_);
}
void SessionEventExecutorWin::OnSessionStarted(
scoped_ptr<protocol::ClipboardStub> client_clipboard) {
if (MessageLoop::current() != message_loop_) {
message_loop_->PostTask(
FROM_HERE,
base::Bind(&SessionEventExecutorWin::OnSessionStarted,
weak_ptr_, base::Passed(&client_clipboard)));
return;
}
nested_executor_->OnSessionStarted(client_clipboard.Pass());
}
void SessionEventExecutorWin::OnSessionFinished() {
if (MessageLoop::current() != message_loop_) {
message_loop_->PostTask(
FROM_HERE,
base::Bind(&SessionEventExecutorWin::OnSessionFinished,
weak_ptr_));
return;
}
nested_executor_->OnSessionFinished();
}
void SessionEventExecutorWin::InjectClipboardEvent(
const ClipboardEvent& event) {
if (MessageLoop::current() != message_loop_) {
message_loop_->PostTask(
FROM_HERE,
base::Bind(&SessionEventExecutorWin::InjectClipboardEvent,
weak_ptr_, event));
return;
}
nested_executor_->InjectClipboardEvent(event);
}
void SessionEventExecutorWin::InjectKeyEvent(const KeyEvent& event) {
if (MessageLoop::current() != message_loop_) {
message_loop_->PostTask(
FROM_HERE,
base::Bind(&SessionEventExecutorWin::InjectKeyEvent,
weak_ptr_, event));
return;
}
// 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 &&
areCtrlAndAltPressed(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());
}
}
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 (MessageLoop::current() != message_loop_) {
message_loop_->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<DesktopWin> input_desktop = DesktopWin::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
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