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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/win/session_input_injector.h"
#include <set>
#include <string>
#include "base/bind.h"
#include "base/callback.h"
#include "base/compiler_specific.h"
#include "base/location.h"
#include "base/single_thread_task_runner.h"
#include "base/win/windows_version.h"
#include "remoting/host/sas_injector.h"
#include "remoting/proto/event.pb.h"
#include "third_party/webrtc/modules/desktop_capture/win/desktop.h"
#include "third_party/webrtc/modules/desktop_capture/win/scoped_thread_desktop.h"
namespace {
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());
}
} // namespace
namespace remoting {
using protocol::ClipboardEvent;
using protocol::MouseEvent;
using protocol::KeyEvent;
class SessionInputInjectorWin::Core
: public base::RefCountedThreadSafe<SessionInputInjectorWin::Core>,
public InputInjector {
public:
Core(
scoped_refptr<base::SingleThreadTaskRunner> input_task_runner,
scoped_ptr<InputInjector> nested_executor,
scoped_refptr<base::SingleThreadTaskRunner> inject_sas_task_runner,
const base::Closure& inject_sas);
// InputInjector implementation.
virtual void Start(
scoped_ptr<protocol::ClipboardStub> client_clipboard) OVERRIDE;
// protocol::ClipboardStub implementation.
virtual void InjectClipboardEvent(
const protocol::ClipboardEvent& event) OVERRIDE;
// protocol::InputStub implementation.
virtual void InjectKeyEvent(const protocol::KeyEvent& event) OVERRIDE;
virtual void InjectMouseEvent(const protocol::MouseEvent& event) OVERRIDE;
private:
friend class base::RefCountedThreadSafe<Core>;
virtual ~Core();
// Switches to the desktop receiving a user input if different from
// the current one.
void SwitchToInputDesktop();
scoped_refptr<base::SingleThreadTaskRunner> input_task_runner_;
// Pointer to the next event executor.
scoped_ptr<InputInjector> nested_executor_;
scoped_refptr<base::SingleThreadTaskRunner> inject_sas_task_runner_;
webrtc::ScopedThreadDesktop desktop_;
// Used to inject Secure Attention Sequence on Vista+.
base::Closure inject_sas_;
// Used to inject Secure Attention Sequence on XP.
scoped_ptr<SasInjector> sas_injector_;
// Keys currently pressed by the client, used to detect Ctrl-Alt-Del.
std::set<uint32> pressed_keys_;
DISALLOW_COPY_AND_ASSIGN(Core);
};
SessionInputInjectorWin::Core::Core(
scoped_refptr<base::SingleThreadTaskRunner> input_task_runner,
scoped_ptr<InputInjector> nested_executor,
scoped_refptr<base::SingleThreadTaskRunner> inject_sas_task_runner,
const base::Closure& inject_sas)
: input_task_runner_(input_task_runner),
nested_executor_(nested_executor.Pass()),
inject_sas_task_runner_(inject_sas_task_runner),
inject_sas_(inject_sas) {
}
void SessionInputInjectorWin::Core::Start(
scoped_ptr<protocol::ClipboardStub> client_clipboard) {
if (!input_task_runner_->BelongsToCurrentThread()) {
input_task_runner_->PostTask(
FROM_HERE,
base::Bind(&Core::Start, this, base::Passed(&client_clipboard)));
return;
}
nested_executor_->Start(client_clipboard.Pass());
}
void SessionInputInjectorWin::Core::InjectClipboardEvent(
const ClipboardEvent& event) {
if (!input_task_runner_->BelongsToCurrentThread()) {
input_task_runner_->PostTask(
FROM_HERE, base::Bind(&Core::InjectClipboardEvent, this, event));
return;
}
nested_executor_->InjectClipboardEvent(event);
}
void SessionInputInjectorWin::Core::InjectKeyEvent(const KeyEvent& event) {
if (!input_task_runner_->BelongsToCurrentThread()) {
input_task_runner_->PostTask(
FROM_HERE, base::Bind(&Core::InjectKeyEvent, this, 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 &&
CheckCtrlAndAltArePressed(pressed_keys_)) {
VLOG(3) << "Sending Secure Attention Sequence to the session";
if (base::win::GetVersion() < base::win::VERSION_VISTA) {
if (!sas_injector_)
sas_injector_ = SasInjector::Create();
if (!sas_injector_->InjectSas())
LOG(ERROR) << "Failed to inject Secure Attention Sequence.";
} else {
inject_sas_task_runner_->PostTask(FROM_HERE, inject_sas_);
}
}
pressed_keys_.insert(event.usb_keycode());
} else {
pressed_keys_.erase(event.usb_keycode());
}
}
SwitchToInputDesktop();
nested_executor_->InjectKeyEvent(event);
}
void SessionInputInjectorWin::Core::InjectMouseEvent(const MouseEvent& event) {
if (!input_task_runner_->BelongsToCurrentThread()) {
input_task_runner_->PostTask(
FROM_HERE, base::Bind(&Core::InjectMouseEvent, this, event));
return;
}
SwitchToInputDesktop();
nested_executor_->InjectMouseEvent(event);
}
SessionInputInjectorWin::Core::~Core() {
}
void SessionInputInjectorWin::Core::SwitchToInputDesktop() {
// Switch to the desktop receiving user input if different from the current
// one.
scoped_ptr<webrtc::Desktop> input_desktop(
webrtc::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.release());
}
}
SessionInputInjectorWin::SessionInputInjectorWin(
scoped_refptr<base::SingleThreadTaskRunner> input_task_runner,
scoped_ptr<InputInjector> nested_executor,
scoped_refptr<base::SingleThreadTaskRunner> inject_sas_task_runner,
const base::Closure& inject_sas) {
core_ = new Core(input_task_runner, nested_executor.Pass(),
inject_sas_task_runner, inject_sas);
}
SessionInputInjectorWin::~SessionInputInjectorWin() {
}
void SessionInputInjectorWin::Start(
scoped_ptr<protocol::ClipboardStub> client_clipboard) {
core_->Start(client_clipboard.Pass());
}
void SessionInputInjectorWin::InjectClipboardEvent(
const protocol::ClipboardEvent& event) {
core_->InjectClipboardEvent(event);
}
void SessionInputInjectorWin::InjectKeyEvent(const protocol::KeyEvent& event) {
core_->InjectKeyEvent(event);
}
void SessionInputInjectorWin::InjectMouseEvent(
const protocol::MouseEvent& event) {
core_->InjectMouseEvent(event);
}
} // namespace remoting
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