1 /* See LICENSE file for license details. */
2 #define _XOPEN_SOURCE 500
15 #include <sys/types.h>
16 #include <X11/extensions/Xrandr.h>
17 #include <X11/keysym.h>
19 #include <X11/Xutil.h>
22 #include <login_cap.h>
39 unsigned long colors[NUMCOLS];
44 static Bool running = True;
45 static Bool failure = False;
51 die(const char *errstr, ...)
56 vfprintf(stderr, errstr, ap);
63 #include <linux/oom.h>
72 fd = open("/proc/self/oom_score_adj", O_WRONLY);
73 if (fd < 0 && errno == ENOENT)
76 /* convert OOM_SCORE_ADJ_MIN to string for writing */
77 length = snprintf(value, sizeof(value), "%d\n", OOM_SCORE_ADJ_MIN);
79 /* bail on truncation */
80 if (length >= sizeof(value))
81 die("buffer too small\n");
83 if (fd < 0 || write(fd, value, length) != length || close(fd) != 0)
84 die("cannot disable the out-of-memory killer for this process (make sure to suid or sgid slock)\n");
89 /* only run as root */
97 if (!(pw = getpwuid(getuid()))) {
99 die("slock: getpwuid: %s\n", strerror(errno));
101 die("slock: cannot retrieve password entry\n");
103 rval = pw->pw_passwd;
106 if (rval[0] == 'x' && rval[1] == '\0') {
108 if (!(sp = getspnam(getenv("USER"))))
109 die("slock: cannot retrieve shadow entry (make sure to suid or sgid slock)\n");
114 /* drop privileges */
115 if (geteuid() == 0 &&
116 ((getegid() != pw->pw_gid && setgid(pw->pw_gid) < 0) || setuid(pw->pw_uid) < 0))
117 die("slock: cannot drop privileges\n");
126 readpw(Display *dpy, const char *pws)
129 char buf[32], passwd[256];
131 unsigned int len, color;
134 static int oldc = INIT;
139 /* As "slock" stands for "Simple X display locker", the DPMS settings
140 * had been removed and you can set it with "xset" or some other
141 * utility. This way the user can easily set a customized DPMS
143 while (running && !XNextEvent(dpy, &ev)) {
144 if (ev.type == KeyPress) {
146 num = XLookupString(&ev.xkey, buf, sizeof(buf), &ksym, 0);
147 if (IsKeypadKey(ksym)) {
148 if (ksym == XK_KP_Enter)
150 else if (ksym >= XK_KP_0 && ksym <= XK_KP_9)
151 ksym = (ksym - XK_KP_0) + XK_0;
153 if (IsFunctionKey(ksym) ||
155 IsMiscFunctionKey(ksym) ||
157 IsPrivateKeypadKey(ksym))
163 running = !auth_userokay(getlogin(), NULL, "auth-xlock", passwd);
165 running = !!strcmp(crypt(passwd, pws), pws);
181 if (num && !iscntrl((int)buf[0]) && (len + num < sizeof(passwd))) {
182 memcpy(passwd + len, buf, num);
187 color = len ? INPUT : (failure || failonclear ? FAILED : INIT);
188 if (running && oldc != color) {
189 for (screen = 0; screen < nscreens; screen++) {
190 XSetWindowBackground(dpy, locks[screen]->win, locks[screen]->colors[color]);
191 XClearWindow(dpy, locks[screen]->win);
195 } else if (rr && ev.type == rrevbase + RRScreenChangeNotify) {
196 XRRScreenChangeNotifyEvent *rre = (XRRScreenChangeNotifyEvent*)&ev;
197 for (screen = 0; screen < nscreens; screen++) {
198 if (locks[screen]->win == rre->window) {
199 XResizeWindow(dpy, locks[screen]->win, rre->width, rre->height);
200 XClearWindow(dpy, locks[screen]->win);
203 } else for (screen = 0; screen < nscreens; screen++)
204 XRaiseWindow(dpy, locks[screen]->win);
209 unlockscreen(Display *dpy, Lock *lock)
211 if(dpy == NULL || lock == NULL)
214 XUngrabPointer(dpy, CurrentTime);
215 XFreeColors(dpy, DefaultColormap(dpy, lock->screen), lock->colors, NUMCOLS, 0);
216 XFreePixmap(dpy, lock->pmap);
217 XDestroyWindow(dpy, lock->win);
223 lockscreen(Display *dpy, int screen)
225 char curs[] = {0, 0, 0, 0, 0, 0, 0, 0};
230 XSetWindowAttributes wa;
233 if (!running || dpy == NULL || screen < 0 || !(lock = malloc(sizeof(Lock))))
236 lock->screen = screen;
237 lock->root = RootWindow(dpy, lock->screen);
239 for (i = 0; i < NUMCOLS; i++) {
240 XAllocNamedColor(dpy, DefaultColormap(dpy, lock->screen), colorname[i], &color, &dummy);
241 lock->colors[i] = color.pixel;
245 wa.override_redirect = 1;
246 wa.background_pixel = lock->colors[INIT];
247 lock->win = XCreateWindow(dpy, lock->root, 0, 0, DisplayWidth(dpy, lock->screen), DisplayHeight(dpy, lock->screen),
248 0, DefaultDepth(dpy, lock->screen), CopyFromParent,
249 DefaultVisual(dpy, lock->screen), CWOverrideRedirect | CWBackPixel, &wa);
250 lock->pmap = XCreateBitmapFromData(dpy, lock->win, curs, 8, 8);
251 invisible = XCreatePixmapCursor(dpy, lock->pmap, lock->pmap, &color, &color, 0, 0);
252 XDefineCursor(dpy, lock->win, invisible);
253 XMapRaised(dpy, lock->win);
255 XRRSelectInput(dpy, lock->win, RRScreenChangeNotifyMask);
257 /* Try to grab mouse pointer *and* keyboard, else fail the lock */
258 for (len = 1000; len; len--) {
259 if (XGrabPointer(dpy, lock->root, False, ButtonPressMask | ButtonReleaseMask | PointerMotionMask,
260 GrabModeAsync, GrabModeAsync, None, invisible, CurrentTime) == GrabSuccess)
265 fprintf(stderr, "slock: unable to grab mouse pointer for screen %d\n", screen);
267 for (len = 1000; len; len--) {
268 if (XGrabKeyboard(dpy, lock->root, True, GrabModeAsync, GrabModeAsync, CurrentTime) == GrabSuccess) {
269 /* everything fine, we grabbed both inputs */
270 XSelectInput(dpy, lock->root, SubstructureNotifyMask);
275 fprintf(stderr, "slock: unable to grab keyboard for screen %d\n", screen);
277 /* grabbing one of the inputs failed */
279 unlockscreen(dpy, lock);
286 fprintf(stderr, "usage: slock [-v|POST_LOCK_CMD]\n");
291 main(int argc, char **argv) {
292 #ifndef HAVE_BSD_AUTH
298 if ((argc == 2) && !strcmp("-v", argv[1]))
299 die("slock-%s, © 2006-2015 slock engineers\n", VERSION);
301 if ((argc == 2) && !strcmp("-h", argv[1]))
308 if (!getpwuid(getuid()))
309 die("slock: no passwd entry for you\n");
311 #ifndef HAVE_BSD_AUTH
315 if (!(dpy = XOpenDisplay(0)))
316 die("slock: cannot open display\n");
317 rr = XRRQueryExtension(dpy, &rrevbase, &rrerrbase);
318 /* Get the number of screens in display "dpy" and blank them all. */
319 nscreens = ScreenCount(dpy);
320 if (!(locks = malloc(sizeof(Lock*) * nscreens)))
321 die("slock: malloc: %s\n", strerror(errno));
323 for (screen = 0; screen < nscreens; screen++) {
324 if ((locks[screen] = lockscreen(dpy, screen)) != NULL)
329 /* Did we actually manage to lock something? */
330 if (nlocks == 0) { /* nothing to protect */
336 if (argc >= 2 && fork() == 0) {
338 close(ConnectionNumber(dpy));
339 execvp(argv[1], argv+1);
340 die("slock: execvp %s failed: %s\n", argv[1], strerror(errno));
343 /* Everything is now blank. Now wait for the correct password. */
350 /* Password ok, unlock everything and quit. */
351 for (screen = 0; screen < nscreens; screen++)
352 unlockscreen(dpy, locks[screen]);