1 /* See LICENSE file for license details. */
2 #define _XOPEN_SOURCE 500
16 #include <sys/types.h>
17 #include <X11/extensions/Xrandr.h>
18 #include <X11/keysym.h>
20 #include <X11/Xutil.h>
40 unsigned long colors[NUMCOLS];
50 die(const char *errstr, ...)
55 vfprintf(stderr, errstr, ap);
62 #include <linux/oom.h>
68 const char oomfile[] = "/proc/self/oom_score_adj";
70 if (!(f = fopen(oomfile, "w"))) {
73 die("slock: fopen %s: %s\n", oomfile, strerror(errno));
75 fprintf(f, "%d", OOM_SCORE_ADJ_MIN);
78 die("slock: unable to disable OOM killer. "
79 "suid or sgid set?\n");
81 die("slock: fclose %s: %s\n", oomfile,
93 /* Check if the current user has a password entry */
95 if (!(pw = getpwuid(getuid()))) {
97 die("slock: getpwuid: %s\n", strerror(errno));
99 die("slock: cannot retrieve password entry\n");
101 rval = pw->pw_passwd;
104 if (rval[0] == 'x' && rval[1] == '\0') {
106 if (!(sp = getspnam(getenv("USER"))))
107 die("slock: getspnam: cannot retrieve shadow entry (make sure to suid or sgid slock)\n");
111 if (rval[0] == '*' && rval[1] == '\0') {
113 if (!(pw = getpwnam_shadow(getenv("USER"))))
114 die("slock: getpwnam_shadow: cannot retrieve shadow entry (make sure to suid or sgid slock)\n");
115 rval = pw->pw_passwd;
117 die("slock: getpwuid: cannot retrieve shadow entry (make sure to suid or sgid slock)\n");
118 #endif /* __OpenBSD__ */
120 #endif /* HAVE_SHADOW_H */
126 readpw(Display *dpy, const char *pws)
128 char buf[32], passwd[256], *encrypted;
129 int num, screen, running, failure;
130 unsigned int len, color;
133 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) {
145 explicit_bzero(&buf, sizeof(buf));
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 if (!(encrypted = crypt(passwd, pws)))
164 fprintf(stderr, "slock: crypt: %s\n", strerror(errno));
166 running = !!strcmp(encrypted, pws);
171 explicit_bzero(&passwd, sizeof(passwd));
175 explicit_bzero(&passwd, sizeof(passwd));
183 if (num && !iscntrl((int)buf[0]) && (len + num < sizeof(passwd))) {
184 memcpy(passwd + len, buf, num);
189 color = len ? INPUT : (failure || failonclear ? FAILED : INIT);
190 if (running && oldc != color) {
191 for (screen = 0; screen < nscreens; screen++) {
192 XSetWindowBackground(dpy, locks[screen]->win, locks[screen]->colors[color]);
193 XClearWindow(dpy, locks[screen]->win);
197 } else if (rr && ev.type == rrevbase + RRScreenChangeNotify) {
198 XRRScreenChangeNotifyEvent *rre = (XRRScreenChangeNotifyEvent*)&ev;
199 for (screen = 0; screen < nscreens; screen++) {
200 if (locks[screen]->win == rre->window) {
201 XResizeWindow(dpy, locks[screen]->win, rre->width, rre->height);
202 XClearWindow(dpy, locks[screen]->win);
205 } else for (screen = 0; screen < nscreens; screen++)
206 XRaiseWindow(dpy, locks[screen]->win);
211 unlockscreen(Display *dpy, Lock *lock)
213 if(dpy == NULL || lock == NULL)
216 XUngrabPointer(dpy, CurrentTime);
217 XUngrabKeyboard(dpy, CurrentTime);
218 XFreeColors(dpy, DefaultColormap(dpy, lock->screen), lock->colors, NUMCOLS, 0);
219 XFreePixmap(dpy, lock->pmap);
220 XDestroyWindow(dpy, lock->win);
226 cleanup(Display *dpy)
230 for (s = 0; s < nscreens; ++s)
231 unlockscreen(dpy, locks[s]);
238 lockscreen(Display *dpy, int screen)
240 char curs[] = {0, 0, 0, 0, 0, 0, 0, 0};
241 int i, ptgrab, kbgrab;
244 XSetWindowAttributes wa;
247 if (dpy == NULL || screen < 0 || !(lock = malloc(sizeof(Lock))))
250 lock->screen = screen;
251 lock->root = RootWindow(dpy, lock->screen);
253 for (i = 0; i < NUMCOLS; i++) {
254 XAllocNamedColor(dpy, DefaultColormap(dpy, lock->screen), colorname[i], &color, &dummy);
255 lock->colors[i] = color.pixel;
259 wa.override_redirect = 1;
260 wa.background_pixel = lock->colors[INIT];
261 lock->win = XCreateWindow(dpy, lock->root, 0, 0, DisplayWidth(dpy, lock->screen), DisplayHeight(dpy, lock->screen),
262 0, DefaultDepth(dpy, lock->screen), CopyFromParent,
263 DefaultVisual(dpy, lock->screen), CWOverrideRedirect | CWBackPixel, &wa);
264 lock->pmap = XCreateBitmapFromData(dpy, lock->win, curs, 8, 8);
265 invisible = XCreatePixmapCursor(dpy, lock->pmap, lock->pmap, &color, &color, 0, 0);
266 XDefineCursor(dpy, lock->win, invisible);
268 /* Try to grab mouse pointer *and* keyboard for 600ms, else fail the lock */
269 for (i = 0, ptgrab = kbgrab = -1; i < 6; i++) {
270 if (ptgrab != GrabSuccess) {
271 ptgrab = XGrabPointer(dpy, lock->root, False,
272 ButtonPressMask | ButtonReleaseMask |
273 PointerMotionMask, GrabModeAsync,
274 GrabModeAsync, None, invisible, CurrentTime);
276 if (kbgrab != GrabSuccess) {
277 kbgrab = XGrabKeyboard(dpy, lock->root, True,
278 GrabModeAsync, GrabModeAsync, CurrentTime);
281 /* input is grabbed: we can lock the screen */
282 if (ptgrab == GrabSuccess && kbgrab == GrabSuccess) {
283 XMapRaised(dpy, lock->win);
285 XRRSelectInput(dpy, lock->win, RRScreenChangeNotifyMask);
287 XSelectInput(dpy, lock->root, SubstructureNotifyMask);
291 /* retry on AlreadyGrabbed but fail on other errors */
292 if ((ptgrab != AlreadyGrabbed && ptgrab != GrabSuccess) ||
293 (kbgrab != AlreadyGrabbed && kbgrab != GrabSuccess))
299 /* we couldn't grab all input: fail out */
300 if (ptgrab != GrabSuccess)
301 fprintf(stderr, "slock: unable to grab mouse pointer for screen %d\n", screen);
302 if (kbgrab != GrabSuccess)
303 fprintf(stderr, "slock: unable to grab keyboard for screen %d\n", screen);
310 die("usage: slock [-v] [cmd [arg ...]]\n");
314 main(int argc, char **argv) {
325 fprintf(stderr, "slock-"VERSION"\n");
331 /* validate drop-user and -group */
333 if (!(pwd = getpwnam(user)))
334 die("slock: getpwnam %s: %s\n", user, errno ?
335 strerror(errno) : "user entry not found");
338 if (!(grp = getgrnam(group)))
339 die("slock: getgrnam %s: %s\n", group, errno ?
340 strerror(errno) : "group entry not found");
349 die("slock: failed to get user password hash.\n");
351 if (!(dpy = XOpenDisplay(NULL)))
352 die("slock: cannot open display\n");
354 /* drop privileges */
355 if (setgroups(0, NULL) < 0)
356 die("slock: setgroups: %s\n", strerror(errno));
357 if (setgid(dgid) < 0)
358 die("slock: setgid: %s\n", strerror(errno));
359 if (setuid(duid) < 0)
360 die("slock: setuid: %s\n", strerror(errno));
362 /* check for Xrandr support */
363 rr = XRRQueryExtension(dpy, &rrevbase, &rrerrbase);
365 /* get number of screens in display "dpy" and blank them */
366 nscreens = ScreenCount(dpy);
367 if (!(locks = calloc(nscreens, sizeof(Lock *)))) {
369 die("slock: out of memory\n");
371 for (nlocks = 0, s = 0; s < nscreens; s++) {
372 if ((locks[s] = lockscreen(dpy, s)) != NULL)
379 /* did we manage to lock everything? */
380 if (nlocks != nscreens) {
385 /* run post-lock command */
390 die("slock: fork failed: %s\n", strerror(errno));
392 if (close(ConnectionNumber(dpy)) < 0)
393 die("slock: close: %s\n", strerror(errno));
394 execvp(argv[0], argv);
395 fprintf(stderr, "slock: execvp %s: %s\n", argv[0],
401 /* everything is now blank. Wait for the correct password */
404 /* password ok, unlock everything and quit */