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>
44 unsigned long colors[NUMCOLS];
49 static Bool running = True;
50 static Bool failure = False;
56 die(const char *errstr, ...)
61 vfprintf(stderr, errstr, ap);
68 #include <linux/oom.h>
74 const char oomfile[] = "/proc/self/oom_score_adj";
76 if (!(f = fopen(oomfile, "w"))) {
79 die("slock: fopen %s: %s\n", oomfile, strerror(errno));
81 fprintf(f, "%d", OOM_SCORE_ADJ_MIN);
84 die("slock: unable to disable OOM killer. "
85 "suid or sgid set?\n");
87 die("slock: fclose %s: %s\n", oomfile,
94 /* only run as root */
102 if (!(pw = getpwuid(getuid()))) {
104 die("getpwuid: %s\n", strerror(errno));
106 die("cannot retrieve password entry\n");
108 rval = pw->pw_passwd;
111 if (rval[0] == 'x' && rval[1] == '\0') {
113 if (!(sp = getspnam(getenv("USER"))))
114 die("cannot retrieve shadow entry (make sure to suid or sgid slock)\n");
119 /* drop privileges */
120 if (geteuid() == 0 &&
121 ((getegid() != pw->pw_gid && setgid(pw->pw_gid) < 0) || setuid(pw->pw_uid) < 0))
122 die("cannot drop privileges\n");
131 readpw(Display *dpy, const char *pws)
134 char buf[32], passwd[256], *encrypted;
136 unsigned int len, color;
139 static int oldc = INIT;
144 /* As "slock" stands for "Simple X display locker", the DPMS settings
145 * had been removed and you can set it with "xset" or some other
146 * utility. This way the user can easily set a customized DPMS
148 while (running && !XNextEvent(dpy, &ev)) {
149 if (ev.type == KeyPress) {
150 explicit_bzero(&buf, sizeof(buf));
151 num = XLookupString(&ev.xkey, buf, sizeof(buf), &ksym, 0);
152 if (IsKeypadKey(ksym)) {
153 if (ksym == XK_KP_Enter)
155 else if (ksym >= XK_KP_0 && ksym <= XK_KP_9)
156 ksym = (ksym - XK_KP_0) + XK_0;
158 if (IsFunctionKey(ksym) ||
160 IsMiscFunctionKey(ksym) ||
162 IsPrivateKeypadKey(ksym))
168 running = !auth_userokay(getlogin(), NULL, "auth-slock", passwd);
171 if (!(encrypted = crypt(passwd, pws)))
172 fprintf(stderr, "slock: crypt: %s\n", strerror(errno));
174 running = !!strcmp(encrypted, pws);
180 explicit_bzero(&passwd, sizeof(passwd));
184 explicit_bzero(&passwd, sizeof(passwd));
192 if (num && !iscntrl((int)buf[0]) && (len + num < sizeof(passwd))) {
193 memcpy(passwd + len, buf, num);
198 color = len ? INPUT : (failure || failonclear ? FAILED : INIT);
199 if (running && oldc != color) {
200 for (screen = 0; screen < nscreens; screen++) {
201 XSetWindowBackground(dpy, locks[screen]->win, locks[screen]->colors[color]);
202 XClearWindow(dpy, locks[screen]->win);
206 } else if (rr && ev.type == rrevbase + RRScreenChangeNotify) {
207 XRRScreenChangeNotifyEvent *rre = (XRRScreenChangeNotifyEvent*)&ev;
208 for (screen = 0; screen < nscreens; screen++) {
209 if (locks[screen]->win == rre->window) {
210 XResizeWindow(dpy, locks[screen]->win, rre->width, rre->height);
211 XClearWindow(dpy, locks[screen]->win);
214 } else for (screen = 0; screen < nscreens; screen++)
215 XRaiseWindow(dpy, locks[screen]->win);
220 unlockscreen(Display *dpy, Lock *lock)
222 if(dpy == NULL || lock == NULL)
225 XUngrabPointer(dpy, CurrentTime);
226 XUngrabKeyboard(dpy, CurrentTime);
227 XFreeColors(dpy, DefaultColormap(dpy, lock->screen), lock->colors, NUMCOLS, 0);
228 XFreePixmap(dpy, lock->pmap);
229 XDestroyWindow(dpy, lock->win);
235 cleanup(Display *dpy)
242 lockscreen(Display *dpy, int screen)
244 char curs[] = {0, 0, 0, 0, 0, 0, 0, 0};
245 int i, ptgrab, kbgrab;
248 XSetWindowAttributes wa;
251 if (!running || dpy == NULL || screen < 0 || !(lock = malloc(sizeof(Lock))))
254 lock->screen = screen;
255 lock->root = RootWindow(dpy, lock->screen);
257 for (i = 0; i < NUMCOLS; i++) {
258 XAllocNamedColor(dpy, DefaultColormap(dpy, lock->screen), colorname[i], &color, &dummy);
259 lock->colors[i] = color.pixel;
263 wa.override_redirect = 1;
264 wa.background_pixel = lock->colors[INIT];
265 lock->win = XCreateWindow(dpy, lock->root, 0, 0, DisplayWidth(dpy, lock->screen), DisplayHeight(dpy, lock->screen),
266 0, DefaultDepth(dpy, lock->screen), CopyFromParent,
267 DefaultVisual(dpy, lock->screen), CWOverrideRedirect | CWBackPixel, &wa);
268 lock->pmap = XCreateBitmapFromData(dpy, lock->win, curs, 8, 8);
269 invisible = XCreatePixmapCursor(dpy, lock->pmap, lock->pmap, &color, &color, 0, 0);
270 XDefineCursor(dpy, lock->win, invisible);
272 /* Try to grab mouse pointer *and* keyboard for 600ms, else fail the lock */
273 for (i = 6, ptgrab = kbgrab = -1; i; --i) {
274 if (ptgrab != GrabSuccess) {
275 ptgrab = XGrabPointer(dpy, lock->root, False,
276 ButtonPressMask | ButtonReleaseMask |
277 PointerMotionMask, GrabModeAsync,
278 GrabModeAsync, None, invisible, CurrentTime);
280 if (kbgrab != GrabSuccess) {
281 kbgrab = XGrabKeyboard(dpy, lock->root, True,
282 GrabModeAsync, GrabModeAsync, CurrentTime);
285 /* input is grabbed: we can lock the screen */
286 if (ptgrab == GrabSuccess && kbgrab == GrabSuccess) {
287 XMapRaised(dpy, lock->win);
289 XRRSelectInput(dpy, lock->win, RRScreenChangeNotifyMask);
291 XSelectInput(dpy, lock->root, SubstructureNotifyMask);
295 /* retry on AlreadyGrabbed but fail on other errors */
296 if ((ptgrab != AlreadyGrabbed && ptgrab != GrabSuccess) ||
297 (kbgrab != AlreadyGrabbed && kbgrab != GrabSuccess))
303 /* we couldn't grab all input: fail out */
304 if (ptgrab != GrabSuccess)
305 fprintf(stderr, "slock: unable to grab mouse pointer for screen %d\n", screen);
306 if (kbgrab != GrabSuccess)
307 fprintf(stderr, "slock: unable to grab keyboard for screen %d\n", screen);
309 unlockscreen(dpy, lock);
316 die("usage: slock [-v] [cmd [arg ...]]\n");
320 main(int argc, char **argv) {
321 #ifndef HAVE_BSD_AUTH
329 fprintf(stderr, "slock-"VERSION"\n");
339 /* Check if the current user has a password entry */
341 if (!getpwuid(getuid())) {
343 die("slock: no password entry for current user\n");
345 die("slock: getpwuid: %s\n", strerror(errno));
348 #ifndef HAVE_BSD_AUTH
351 die("slock: failed to get user password hash.\n");
354 if (!(dpy = XOpenDisplay(NULL)))
355 die("slock: cannot open display\n");
357 /* check for Xrandr support */
358 rr = XRRQueryExtension(dpy, &rrevbase, &rrerrbase);
360 /* get number of screens in display "dpy" and blank them */
361 nscreens = ScreenCount(dpy);
362 if (!(locks = malloc(sizeof(Lock *) * nscreens))) {
364 die("slock: out of memory\n");
366 for (nlocks = 0, s = 0; s < nscreens; s++) {
367 if ((locks[s] = lockscreen(dpy, s)) != NULL)
372 /* did we actually manage to lock anything? */
374 /* nothing to protect */
379 /* run post-lock command */
384 die("slock: fork failed: %s\n", strerror(errno));
386 if (close(ConnectionNumber(dpy)) < 0)
387 die("slock: close: %s\n", strerror(errno));
388 execvp(argv[0], argv);
389 fprintf(stderr, "slock: execvp %s: %s\n", argv[0],
395 /* everything is now blank. Wait for the correct password */
402 /* password ok, unlock everything and quit */
403 for (s = 0; s < nscreens; s++)
404 unlockscreen(dpy, locks[s]);