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];
54 die(const char *errstr, ...)
59 vfprintf(stderr, errstr, ap);
66 #include <linux/oom.h>
72 const char oomfile[] = "/proc/self/oom_score_adj";
74 if (!(f = fopen(oomfile, "w"))) {
77 die("slock: fopen %s: %s\n", oomfile, strerror(errno));
79 fprintf(f, "%d", OOM_SCORE_ADJ_MIN);
82 die("slock: unable to disable OOM killer. "
83 "suid or sgid set?\n");
85 die("slock: fclose %s: %s\n", oomfile,
92 /* only run as root */
100 if (!(pw = getpwuid(getuid()))) {
102 die("slock: getpwuid: %s\n", strerror(errno));
104 die("slock: cannot retrieve password entry\n");
106 rval = pw->pw_passwd;
109 if (rval[0] == 'x' && rval[1] == '\0') {
111 if (!(sp = getspnam(getenv("USER"))))
112 die("slock: cannot retrieve shadow entry (make sure to suid or sgid slock)\n");
117 /* drop privileges */
118 if (geteuid() == 0 &&
119 ((getegid() != pw->pw_gid && setgid(pw->pw_gid) < 0) || setuid(pw->pw_uid) < 0))
120 die("slock: cannot drop privileges\n");
129 readpw(Display *dpy, const char *pws)
132 char buf[32], passwd[256], *encrypted;
133 int num, screen, running, failure;
134 unsigned int len, color;
137 static int oldc = INIT;
143 /* As "slock" stands for "Simple X display locker", the DPMS settings
144 * had been removed and you can set it with "xset" or some other
145 * utility. This way the user can easily set a customized DPMS
147 while (running && !XNextEvent(dpy, &ev)) {
148 if (ev.type == KeyPress) {
149 explicit_bzero(&buf, sizeof(buf));
150 num = XLookupString(&ev.xkey, buf, sizeof(buf), &ksym, 0);
151 if (IsKeypadKey(ksym)) {
152 if (ksym == XK_KP_Enter)
154 else if (ksym >= XK_KP_0 && ksym <= XK_KP_9)
155 ksym = (ksym - XK_KP_0) + XK_0;
157 if (IsFunctionKey(ksym) ||
159 IsMiscFunctionKey(ksym) ||
161 IsPrivateKeypadKey(ksym))
167 running = !auth_userokay(getlogin(), NULL, "auth-slock", passwd);
170 if (!(encrypted = crypt(passwd, pws)))
171 fprintf(stderr, "slock: crypt: %s\n", strerror(errno));
173 running = !!strcmp(encrypted, pws);
179 explicit_bzero(&passwd, sizeof(passwd));
183 explicit_bzero(&passwd, sizeof(passwd));
191 if (num && !iscntrl((int)buf[0]) && (len + num < sizeof(passwd))) {
192 memcpy(passwd + len, buf, num);
197 color = len ? INPUT : (failure || failonclear ? FAILED : INIT);
198 if (running && oldc != color) {
199 for (screen = 0; screen < nscreens; screen++) {
200 XSetWindowBackground(dpy, locks[screen]->win, locks[screen]->colors[color]);
201 XClearWindow(dpy, locks[screen]->win);
205 } else if (rr && ev.type == rrevbase + RRScreenChangeNotify) {
206 XRRScreenChangeNotifyEvent *rre = (XRRScreenChangeNotifyEvent*)&ev;
207 for (screen = 0; screen < nscreens; screen++) {
208 if (locks[screen]->win == rre->window) {
209 XResizeWindow(dpy, locks[screen]->win, rre->width, rre->height);
210 XClearWindow(dpy, locks[screen]->win);
213 } else for (screen = 0; screen < nscreens; screen++)
214 XRaiseWindow(dpy, locks[screen]->win);
219 unlockscreen(Display *dpy, Lock *lock)
221 if(dpy == NULL || lock == NULL)
224 XUngrabPointer(dpy, CurrentTime);
225 XUngrabKeyboard(dpy, CurrentTime);
226 XFreeColors(dpy, DefaultColormap(dpy, lock->screen), lock->colors, NUMCOLS, 0);
227 XFreePixmap(dpy, lock->pmap);
228 XDestroyWindow(dpy, lock->win);
234 cleanup(Display *dpy)
238 for (s = 0; s < nscreens; ++s)
239 unlockscreen(dpy, locks[s]);
246 lockscreen(Display *dpy, int screen)
248 char curs[] = {0, 0, 0, 0, 0, 0, 0, 0};
249 int i, ptgrab, kbgrab;
252 XSetWindowAttributes wa;
255 if (dpy == NULL || screen < 0 || !(lock = malloc(sizeof(Lock))))
258 lock->screen = screen;
259 lock->root = RootWindow(dpy, lock->screen);
261 for (i = 0; i < NUMCOLS; i++) {
262 XAllocNamedColor(dpy, DefaultColormap(dpy, lock->screen), colorname[i], &color, &dummy);
263 lock->colors[i] = color.pixel;
267 wa.override_redirect = 1;
268 wa.background_pixel = lock->colors[INIT];
269 lock->win = XCreateWindow(dpy, lock->root, 0, 0, DisplayWidth(dpy, lock->screen), DisplayHeight(dpy, lock->screen),
270 0, DefaultDepth(dpy, lock->screen), CopyFromParent,
271 DefaultVisual(dpy, lock->screen), CWOverrideRedirect | CWBackPixel, &wa);
272 lock->pmap = XCreateBitmapFromData(dpy, lock->win, curs, 8, 8);
273 invisible = XCreatePixmapCursor(dpy, lock->pmap, lock->pmap, &color, &color, 0, 0);
274 XDefineCursor(dpy, lock->win, invisible);
276 /* Try to grab mouse pointer *and* keyboard for 600ms, else fail the lock */
277 for (i = 0, ptgrab = kbgrab = -1; i < 6; i++) {
278 if (ptgrab != GrabSuccess) {
279 ptgrab = XGrabPointer(dpy, lock->root, False,
280 ButtonPressMask | ButtonReleaseMask |
281 PointerMotionMask, GrabModeAsync,
282 GrabModeAsync, None, invisible, CurrentTime);
284 if (kbgrab != GrabSuccess) {
285 kbgrab = XGrabKeyboard(dpy, lock->root, True,
286 GrabModeAsync, GrabModeAsync, CurrentTime);
289 /* input is grabbed: we can lock the screen */
290 if (ptgrab == GrabSuccess && kbgrab == GrabSuccess) {
291 XMapRaised(dpy, lock->win);
293 XRRSelectInput(dpy, lock->win, RRScreenChangeNotifyMask);
295 XSelectInput(dpy, lock->root, SubstructureNotifyMask);
299 /* retry on AlreadyGrabbed but fail on other errors */
300 if ((ptgrab != AlreadyGrabbed && ptgrab != GrabSuccess) ||
301 (kbgrab != AlreadyGrabbed && kbgrab != GrabSuccess))
307 /* we couldn't grab all input: fail out */
308 if (ptgrab != GrabSuccess)
309 fprintf(stderr, "slock: unable to grab mouse pointer for screen %d\n", screen);
310 if (kbgrab != GrabSuccess)
311 fprintf(stderr, "slock: unable to grab keyboard for screen %d\n", screen);
318 die("usage: slock [-v] [cmd [arg ...]]\n");
322 main(int argc, char **argv) {
323 #ifndef HAVE_BSD_AUTH
331 fprintf(stderr, "slock-"VERSION"\n");
341 /* Check if the current user has a password entry */
343 if (!getpwuid(getuid())) {
345 die("slock: no password entry for current user\n");
347 die("slock: getpwuid: %s\n", strerror(errno));
350 #ifndef HAVE_BSD_AUTH
353 die("slock: failed to get user password hash.\n");
356 if (!(dpy = XOpenDisplay(NULL)))
357 die("slock: cannot open display\n");
359 /* check for Xrandr support */
360 rr = XRRQueryExtension(dpy, &rrevbase, &rrerrbase);
362 /* get number of screens in display "dpy" and blank them */
363 nscreens = ScreenCount(dpy);
364 if (!(locks = calloc(nscreens, sizeof(Lock *)))) {
366 die("slock: out of memory\n");
368 for (nlocks = 0, s = 0; s < nscreens; s++) {
369 if ((locks[s] = lockscreen(dpy, s)) != NULL)
376 /* did we manage to lock everything? */
377 if (nlocks != nscreens) {
382 /* run post-lock command */
387 die("slock: fork failed: %s\n", strerror(errno));
389 if (close(ConnectionNumber(dpy)) < 0)
390 die("slock: close: %s\n", strerror(errno));
391 execvp(argv[0], argv);
392 fprintf(stderr, "slock: execvp %s: %s\n", argv[0],
398 /* everything is now blank. Wait for the correct password */
405 /* password ok, unlock everything and quit */