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x11locker.cpp
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x11locker.cpp
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/*
SPDX-FileCopyrightText: 1999 Martin R. Jones <mjones@kde.org>
SPDX-FileCopyrightText: 2002 Luboš Luňák <l.lunak@kde.org>
SPDX-FileCopyrightText: 2003 Oswald Buddenhagen <ossi@kde.org>
SPDX-FileCopyrightText: 2008 Chani Armitage <chanika@gmail.com>
SPDX-FileCopyrightText: 2011 Martin Gräßlin <mgraesslin@kde.org>
SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "x11locker.h"
#include "globalaccel.h"
// KDE
// Qt
#include <QApplication>
#include <QScreen>
#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
#include <private/qtx11extras_p.h>
#else
#include <QDesktopWidget>
#include <QX11Info>
#endif
// X11
#include <X11/Xatom.h>
#include <xcb/xcb.h>
#include <kscreenlocker_logging.h>
static Window gVRoot = 0;
static Window gVRootData = 0;
static Atom gXA_VROOT;
static Atom gXA_SCREENSAVER_VERSION;
namespace ScreenLocker
{
X11Locker::X11Locker(QObject *parent)
: AbstractLocker(parent)
, QAbstractNativeEventFilter()
, m_focusedLockWindow(XCB_WINDOW_NONE)
{
initialize();
}
X11Locker::~X11Locker()
{
qApp->removeNativeEventFilter(this);
}
void X11Locker::initialize()
{
qApp->installNativeEventFilter(this);
XWindowAttributes rootAttr;
XGetWindowAttributes(QX11Info::display(), QX11Info::appRootWindow(), &rootAttr);
XSelectInput(QX11Info::display(), QX11Info::appRootWindow(), SubstructureNotifyMask | rootAttr.your_event_mask);
// Get root window size
updateGeo();
// virtual root property
gXA_VROOT = XInternAtom(QX11Info::display(), "__SWM_VROOT", False);
gXA_SCREENSAVER_VERSION = XInternAtom(QX11Info::display(), "_SCREENSAVER_VERSION", False);
// read the initial information about all toplevel windows
Window r, p;
Window *real;
unsigned nreal;
if (XQueryTree(QX11Info::display(), QX11Info::appRootWindow(), &r, &p, &real, &nreal) && real != nullptr) {
for (unsigned i = 0; i < nreal; ++i) {
XWindowAttributes winAttr;
if (XGetWindowAttributes(QX11Info::display(), real[i], &winAttr)) {
WindowInfo info;
info.window = real[i];
info.viewable = (winAttr.map_state == IsViewable);
m_windowInfo.append(info); // ordered bottom to top
}
}
XFree(real);
}
// monitor for screen geometry changes
connect(qGuiApp, &QGuiApplication::screenAdded, this, [this](QScreen *screen) {
connect(screen, &QScreen::geometryChanged, this, &X11Locker::updateGeo);
updateGeo();
});
connect(qGuiApp, &QGuiApplication::screenRemoved, this, &X11Locker::updateGeo);
const auto screens = QGuiApplication::screens();
for (auto *screen : screens) {
connect(screen, &QScreen::geometryChanged, this, &X11Locker::updateGeo);
}
}
void X11Locker::showLockWindow()
{
m_background->hide();
// Some xscreensaver hacks check for this property
const char *version = "KDE 4.0";
XChangeProperty(QX11Info::display(),
m_background->winId(),
gXA_SCREENSAVER_VERSION,
XA_STRING,
8,
PropModeReplace,
(unsigned char *)version,
strlen(version));
qCDebug(KSCREENLOCKER) << "Lock window Id: " << m_background->winId();
m_background->setPosition(0, 0);
XSync(QX11Info::display(), False);
setVRoot(m_background->winId(), m_background->winId());
}
//---------------------------------------------------------------------------
//
// Hide the screen locker window
//
void X11Locker::hideLockWindow()
{
Q_EMIT userActivity();
m_background->hide();
m_background->lower();
removeVRoot(m_background->winId());
XDeleteProperty(QX11Info::display(), m_background->winId(), gXA_SCREENSAVER_VERSION);
if (gVRoot) {
unsigned long vroot_data[1] = {gVRootData};
XChangeProperty(QX11Info::display(), gVRoot, gXA_VROOT, XA_WINDOW, 32, PropModeReplace, (unsigned char *)vroot_data, 1);
gVRoot = 0;
}
XSync(QX11Info::display(), False);
m_allowedWindows.clear();
}
//---------------------------------------------------------------------------
static int ignoreXError(Display *, XErrorEvent *)
{
return 0;
}
//---------------------------------------------------------------------------
//
// Save the current virtual root window
//
void X11Locker::saveVRoot()
{
Window rootReturn, parentReturn, *children;
unsigned int numChildren;
Window root = QX11Info::appRootWindow();
gVRoot = 0;
gVRootData = 0;
int (*oldHandler)(Display *, XErrorEvent *);
oldHandler = XSetErrorHandler(ignoreXError);
if (XQueryTree(QX11Info::display(), root, &rootReturn, &parentReturn, &children, &numChildren)) {
for (unsigned int i = 0; i < numChildren; i++) {
Atom actual_type;
int actual_format;
unsigned long nitems, bytesafter;
unsigned char *newRoot = nullptr;
if ((XGetWindowProperty(QX11Info::display(),
children[i],
gXA_VROOT,
0,
1,
False,
XA_WINDOW,
&actual_type,
&actual_format,
&nitems,
&bytesafter,
&newRoot)
== Success)
&& newRoot) {
gVRoot = children[i];
Window *dummy = (Window *)newRoot;
gVRootData = *dummy;
XFree((char *)newRoot);
break;
}
}
if (children) {
XFree((char *)children);
}
}
XSetErrorHandler(oldHandler);
}
//---------------------------------------------------------------------------
//
// Set the virtual root property
//
void X11Locker::setVRoot(Window win, Window vr)
{
if (gVRoot) {
removeVRoot(gVRoot);
}
unsigned long rw = QX11Info::appRootWindow();
unsigned long vroot_data[1] = {vr};
Window rootReturn, parentReturn, *children;
unsigned int numChildren;
Window top = win;
while (1) {
if (!XQueryTree(QX11Info::display(), top, &rootReturn, &parentReturn, &children, &numChildren)) {
return;
}
if (children) {
XFree((char *)children);
}
if (parentReturn == rw) {
break;
} else {
top = parentReturn;
}
}
XChangeProperty(QX11Info::display(), top, gXA_VROOT, XA_WINDOW, 32, PropModeReplace, (unsigned char *)vroot_data, 1);
}
//---------------------------------------------------------------------------
//
// Remove the virtual root property
//
void X11Locker::removeVRoot(Window win)
{
XDeleteProperty(QX11Info::display(), win, gXA_VROOT);
}
void X11Locker::fakeFocusIn(WId window)
{
if (window == m_focusedLockWindow) {
return;
}
// We have keyboard grab, so this application will
// get keyboard events even without having focus.
// Fake FocusIn to make Qt realize it has the active
// window, so that it will correctly show cursor in the dialog.
XEvent ev;
memset(&ev, 0, sizeof(ev));
ev.xfocus.display = QX11Info::display();
ev.xfocus.type = FocusIn;
ev.xfocus.window = window;
ev.xfocus.mode = NotifyNormal;
ev.xfocus.detail = NotifyAncestor;
XSendEvent(QX11Info::display(), window, False, NoEventMask, &ev);
XFlush(QX11Info::display());
m_focusedLockWindow = window;
}
template<typename T>
void coordFromEvent(xcb_generic_event_t *event, int *x, int *y)
{
T *e = reinterpret_cast<T *>(event);
*x = e->event_x;
*y = e->event_y;
}
template<typename T>
void sendEvent(xcb_generic_event_t *event, xcb_window_t target, int x, int y)
{
T e = *(reinterpret_cast<T *>(event));
e.event = target;
e.child = target;
e.event_x = x;
e.event_y = y;
xcb_send_event(QX11Info::connection(), false, target, XCB_EVENT_MASK_NO_EVENT, reinterpret_cast<const char *>(&e));
}
#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
bool X11Locker::nativeEventFilter(const QByteArray &eventType, void *message, long int *)
#else
bool X11Locker::nativeEventFilter(const QByteArray &eventType, void *message, qintptr *)
#endif
{
if (eventType != QByteArrayLiteral("xcb_generic_event_t")) {
return false;
}
xcb_generic_event_t *event = reinterpret_cast<xcb_generic_event_t *>(message);
const uint8_t responseType = event->response_type & ~0x80;
if (globalAccel() && responseType == XCB_KEY_PRESS) {
if (globalAccel()->checkKeyPress(reinterpret_cast<xcb_key_press_event_t *>(event))) {
Q_EMIT userActivity();
return true;
}
}
bool ret = false;
switch (responseType) {
case XCB_BUTTON_PRESS:
case XCB_BUTTON_RELEASE:
case XCB_KEY_PRESS:
case XCB_KEY_RELEASE:
case XCB_MOTION_NOTIFY:
Q_EMIT userActivity();
if (!m_lockWindows.isEmpty()) {
int x = 0;
int y = 0;
if (responseType == XCB_KEY_PRESS || responseType == XCB_KEY_RELEASE) {
coordFromEvent<xcb_key_press_event_t>(event, &x, &y);
} else if (responseType == XCB_BUTTON_PRESS || responseType == XCB_BUTTON_RELEASE) {
coordFromEvent<xcb_button_press_event_t>(event, &x, &y);
} else if (responseType == XCB_MOTION_NOTIFY) {
coordFromEvent<xcb_motion_notify_event_t>(event, &x, &y);
}
Window root_return;
int x_return, y_return;
unsigned int width_return, height_return, border_width_return, depth_return;
for (WId window : qAsConst(m_lockWindows)) {
if (XGetGeometry(QX11Info::display(),
window,
&root_return,
&x_return,
&y_return,
&width_return,
&height_return,
&border_width_return,
&depth_return)
&& (x >= x_return && x <= x_return + (int)width_return) && (y >= y_return && y <= y_return + (int)height_return)) {
// We need to do our own focus handling (see comment in fakeFocusIn).
// For now: Focus on clicks inside the window
if (responseType == XCB_BUTTON_PRESS) {
fakeFocusIn(window);
}
const int targetX = x - x_return;
const int targetY = y - y_return;
if (responseType == XCB_KEY_PRESS || responseType == XCB_KEY_RELEASE) {
sendEvent<xcb_key_press_event_t>(event, window, targetX, targetY);
} else if (responseType == XCB_BUTTON_PRESS || responseType == XCB_BUTTON_RELEASE) {
sendEvent<xcb_button_press_event_t>(event, window, targetX, targetY);
} else if (responseType == XCB_MOTION_NOTIFY) {
sendEvent<xcb_motion_notify_event_t>(event, window, targetX, targetY);
}
break;
}
}
ret = true;
}
break;
case XCB_CONFIGURE_NOTIFY: { // from SubstructureNotifyMask on the root window
xcb_configure_notify_event_t *xc = reinterpret_cast<xcb_configure_notify_event_t *>(event);
if (xc->event == QX11Info::appRootWindow()) {
int index = findWindowInfo(xc->window);
if (index >= 0) {
int index2 = xc->above_sibling ? findWindowInfo(xc->above_sibling) : 0;
if (index2 < 0) {
qCDebug(KSCREENLOCKER) << "Unknown above for ConfigureNotify";
} else { // move just above the other window
if (index2 < index) {
++index2;
}
m_windowInfo.move(index, index2);
}
} else {
qCDebug(KSCREENLOCKER) << "Unknown toplevel for ConfigureNotify";
}
// kDebug() << "ConfigureNotify:";
// the stacking order changed, so let's change the stacking order again to what we want
stayOnTop();
ret = true;
}
break;
}
case XCB_MAP_NOTIFY: { // from SubstructureNotifyMask on the root window
xcb_map_notify_event_t *xm = reinterpret_cast<xcb_map_notify_event_t *>(event);
if (xm->event == QX11Info::appRootWindow()) {
qCDebug(KSCREENLOCKER) << "MapNotify:" << xm->window;
int index = findWindowInfo(xm->window);
if (index >= 0) {
m_windowInfo[index].viewable = true;
} else {
qCDebug(KSCREENLOCKER) << "Unknown toplevel for MapNotify";
}
if (m_allowedWindows.contains(xm->window)) {
if (m_lockWindows.contains(xm->window)) {
qCDebug(KSCREENLOCKER) << "uhoh! duplicate!";
} else {
if (!m_background->isVisible()) {
// not yet shown and we have a lock window, so we show our own window
m_background->show();
}
m_lockWindows.prepend(xm->window);
fakeFocusIn(xm->window);
}
}
if (xm->window == m_background->winId()) {
m_background->update();
Q_EMIT lockWindowShown();
return false;
}
stayOnTop();
ret = true;
}
break;
}
case XCB_UNMAP_NOTIFY: {
xcb_unmap_notify_event_t *xu = reinterpret_cast<xcb_unmap_notify_event_t *>(event);
if (xu->event == QX11Info::appRootWindow()) {
qCDebug(KSCREENLOCKER) << "UnmapNotify:" << xu->window;
int index = findWindowInfo(xu->window);
if (index >= 0) {
m_windowInfo[index].viewable = false;
} else {
qCDebug(KSCREENLOCKER) << "Unknown toplevel for MapNotify";
}
m_lockWindows.removeAll(xu->window);
if (m_focusedLockWindow == xu->event && !m_lockWindows.empty()) {
// The currently focused window vanished, just focus the first one in the list
fakeFocusIn(m_lockWindows[0]);
}
ret = true;
}
break;
}
case XCB_CREATE_NOTIFY: {
xcb_create_notify_event_t *xc = reinterpret_cast<xcb_create_notify_event_t *>(event);
if (xc->parent == QX11Info::appRootWindow()) {
qCDebug(KSCREENLOCKER) << "CreateNotify:" << xc->window;
int index = findWindowInfo(xc->window);
if (index >= 0) {
qCDebug(KSCREENLOCKER) << "Already existing toplevel for CreateNotify";
} else {
WindowInfo info;
info.window = xc->window;
info.viewable = false;
m_windowInfo.append(info);
}
ret = true;
}
break;
}
case XCB_DESTROY_NOTIFY: {
xcb_destroy_notify_event_t *xd = reinterpret_cast<xcb_destroy_notify_event_t *>(event);
if (xd->event == QX11Info::appRootWindow()) {
int index = findWindowInfo(xd->window);
if (index >= 0) {
m_windowInfo.removeAt(index);
} else {
qCDebug(KSCREENLOCKER) << "Unknown toplevel for DestroyNotify";
}
ret = true;
}
break;
}
case XCB_REPARENT_NOTIFY: {
xcb_reparent_notify_event_t *xr = reinterpret_cast<xcb_reparent_notify_event_t *>(event);
if (xr->event == QX11Info::appRootWindow() && xr->parent != QX11Info::appRootWindow()) {
int index = findWindowInfo(xr->window);
if (index >= 0) {
m_windowInfo.removeAt(index);
} else {
qCDebug(KSCREENLOCKER) << "Unknown toplevel for ReparentNotify away";
}
} else if (xr->parent == QX11Info::appRootWindow()) {
int index = findWindowInfo(xr->window);
if (index >= 0) {
qCDebug(KSCREENLOCKER) << "Already existing toplevel for ReparentNotify";
} else {
WindowInfo info;
info.window = xr->window;
info.viewable = false;
m_windowInfo.append(info);
}
}
break;
}
case XCB_CIRCULATE_NOTIFY: {
xcb_circulate_notify_event_t *xc = reinterpret_cast<xcb_circulate_notify_event_t *>(event);
if (xc->event == QX11Info::appRootWindow()) {
int index = findWindowInfo(xc->window);
if (index >= 0) {
m_windowInfo.move(index, xc->place == PlaceOnTop ? m_windowInfo.size() - 1 : 0);
} else {
qCDebug(KSCREENLOCKER) << "Unknown toplevel for CirculateNotify";
}
}
break;
}
}
return ret;
}
int X11Locker::findWindowInfo(Window w)
{
for (int i = 0; i < m_windowInfo.size(); ++i) {
if (m_windowInfo[i].window == w) {
return i;
}
}
return -1;
}
void X11Locker::stayOnTop()
{
// this restacking is written in a way so that
// if the stacking positions actually don't change,
// all restacking operations will be no-op,
// and no ConfigureNotify will be generated,
// thus avoiding possible infinite loops
QVector<Window> stack(m_lockWindows.count() + 1);
int count = 0;
for (WId w : qAsConst(m_lockWindows)) {
stack[count++] = w;
}
// finally, the lock window
stack[count++] = m_background->winId();
// do the actual restacking if needed
XRaiseWindow(QX11Info::display(), stack[0]);
if (count > 1) {
XRestackWindows(QX11Info::display(), stack.data(), count);
}
XFlush(QX11Info::display());
}
void X11Locker::updateGeo()
{
QRect geometry;
const auto screens = QGuiApplication::screens();
for (auto *screen : screens) {
geometry |= screen->geometry();
}
m_background->setGeometry(geometry);
m_background->update();
}
void X11Locker::addAllowedWindow(quint32 window)
{
m_allowedWindows << window;
// test whether it's to show
const int index = findWindowInfo(window);
if (index == -1 || !m_windowInfo[index].viewable) {
return;
}
if (m_lockWindows.contains(window)) {
qCDebug(KSCREENLOCKER) << "uhoh! duplicate!";
} else {
if (!m_background->isVisible()) {
// not yet shown and we have a lock window, so we show our own window
m_background->show();
}
if (m_lockWindows.empty()) {
// Make sure to focus the first window
m_focusedLockWindow = XCB_WINDOW_NONE;
fakeFocusIn(window);
}
m_lockWindows.prepend(window);
stayOnTop();
}
}
}