1 /* See LICENSE file for license details. */
2 #define _XOPEN_SOURCE 500
17 #include <sys/types.h>
18 #include <X11/extensions/Xrandr.h>
19 #include <X11/keysym.h>
21 #include <X11/Xutil.h>
28 static time_t locktime;
41 unsigned long colors[NUMCOLS];
53 die(const char *errstr, ...)
58 vfprintf(stderr, errstr, ap);
65 #include <linux/oom.h>
71 const char oomfile[] = "/proc/self/oom_score_adj";
73 if (!(f = fopen(oomfile, "w"))) {
76 die("slock: fopen %s: %s\n", oomfile, strerror(errno));
78 fprintf(f, "%d", OOM_SCORE_ADJ_MIN);
81 die("slock: unable to disable OOM killer. "
82 "Make sure to suid or sgid slock.\n");
84 die("slock: fclose %s: %s\n", oomfile, strerror(errno));
95 /* Check if the current user has a password entry */
97 if (!(pw = getpwuid(getuid()))) {
99 die("slock: getpwuid: %s\n", strerror(errno));
101 die("slock: cannot retrieve password entry\n");
103 hash = pw->pw_passwd;
106 if (!strcmp(hash, "x")) {
108 if (!(sp = getspnam(pw->pw_name)))
109 die("slock: getspnam: cannot retrieve shadow entry. "
110 "Make sure to suid or sgid slock.\n");
114 if (!strcmp(hash, "*")) {
116 if (!(pw = getpwuid_shadow(getuid())))
117 die("slock: getpwnam_shadow: cannot retrieve shadow entry. "
118 "Make sure to suid or sgid slock.\n");
119 hash = pw->pw_passwd;
121 die("slock: getpwuid: cannot retrieve shadow entry. "
122 "Make sure to suid or sgid slock.\n");
123 #endif /* __OpenBSD__ */
125 #endif /* HAVE_SHADOW_H */
131 readpw(Display *dpy, struct xrandr *rr, struct lock **locks, int nscreens,
134 XRRScreenChangeNotifyEvent *rre;
135 char buf[32], passwd[256], *inputhash;
136 int num, screen, running, failure, oldc;
137 unsigned int len, color;
146 while (running && !XNextEvent(dpy, &ev)) {
147 running = !((time(NULL) - locktime < timetocancel) && (ev.type == MotionNotify));
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))
163 if (ev.xkey.state & ControlMask) {
183 if (!(inputhash = crypt(passwd, hash)))
184 fprintf(stderr, "slock: crypt: %s\n", strerror(errno));
186 running = !!strcmp(inputhash, hash);
191 explicit_bzero(&passwd, sizeof(passwd));
195 explicit_bzero(&passwd, sizeof(passwd));
200 passwd[--len] = '\0';
203 if (num && !iscntrl((int)buf[0]) &&
204 (len + num < sizeof(passwd))) {
205 memcpy(passwd + len, buf, num);
210 color = len ? INPUT : ((failure || failonclear) ? FAILED : INIT);
211 if (running && oldc != color) {
212 for (screen = 0; screen < nscreens; screen++) {
213 XSetWindowBackground(dpy,
215 locks[screen]->colors[color]);
216 XClearWindow(dpy, locks[screen]->win);
220 } else if (rr->active && ev.type == rr->evbase + RRScreenChangeNotify) {
221 rre = (XRRScreenChangeNotifyEvent*)&ev;
222 for (screen = 0; screen < nscreens; screen++) {
223 if (locks[screen]->win == rre->window) {
224 if (rre->rotation == RR_Rotate_90 ||
225 rre->rotation == RR_Rotate_270)
226 XResizeWindow(dpy, locks[screen]->win,
227 rre->height, rre->width);
229 XResizeWindow(dpy, locks[screen]->win,
230 rre->width, rre->height);
231 XClearWindow(dpy, locks[screen]->win);
236 for (screen = 0; screen < nscreens; screen++)
237 XRaiseWindow(dpy, locks[screen]->win);
243 lockscreen(Display *dpy, struct xrandr *rr, int screen)
245 char curs[] = {0, 0, 0, 0, 0, 0, 0, 0};
246 int i, ptgrab, kbgrab;
249 XSetWindowAttributes wa;
252 if (dpy == NULL || screen < 0 || !(lock = malloc(sizeof(struct lock))))
255 lock->screen = screen;
256 lock->root = RootWindow(dpy, lock->screen);
258 for (i = 0; i < NUMCOLS; i++) {
259 XAllocNamedColor(dpy, DefaultColormap(dpy, lock->screen),
260 colorname[i], &color, &dummy);
261 lock->colors[i] = color.pixel;
265 wa.override_redirect = 1;
266 wa.background_pixel = lock->colors[INIT];
267 lock->win = XCreateWindow(dpy, lock->root, 0, 0,
268 DisplayWidth(dpy, lock->screen),
269 DisplayHeight(dpy, lock->screen),
270 0, DefaultDepth(dpy, lock->screen),
272 DefaultVisual(dpy, lock->screen),
273 CWOverrideRedirect | CWBackPixel, &wa);
274 lock->pmap = XCreateBitmapFromData(dpy, lock->win, curs, 8, 8);
275 invisible = XCreatePixmapCursor(dpy, lock->pmap, lock->pmap,
276 &color, &color, 0, 0);
277 XDefineCursor(dpy, lock->win, invisible);
279 /* Try to grab mouse pointer *and* keyboard for 600ms, else fail the lock */
280 for (i = 0, ptgrab = kbgrab = -1; i < 6; i++) {
281 if (ptgrab != GrabSuccess) {
282 ptgrab = XGrabPointer(dpy, lock->root, False,
283 ButtonPressMask | ButtonReleaseMask |
284 PointerMotionMask, GrabModeAsync,
285 GrabModeAsync, None, invisible, CurrentTime);
287 if (kbgrab != GrabSuccess) {
288 kbgrab = XGrabKeyboard(dpy, lock->root, True,
289 GrabModeAsync, GrabModeAsync, CurrentTime);
292 /* input is grabbed: we can lock the screen */
293 if (ptgrab == GrabSuccess && kbgrab == GrabSuccess) {
294 XMapRaised(dpy, lock->win);
296 XRRSelectInput(dpy, lock->win, RRScreenChangeNotifyMask);
298 XSelectInput(dpy, lock->root, SubstructureNotifyMask);
299 locktime = time(NULL);
303 /* retry on AlreadyGrabbed but fail on other errors */
304 if ((ptgrab != AlreadyGrabbed && ptgrab != GrabSuccess) ||
305 (kbgrab != AlreadyGrabbed && kbgrab != GrabSuccess))
311 /* we couldn't grab all input: fail out */
312 if (ptgrab != GrabSuccess)
313 fprintf(stderr, "slock: unable to grab mouse pointer for screen %d\n",
315 if (kbgrab != GrabSuccess)
316 fprintf(stderr, "slock: unable to grab keyboard for screen %d\n",
324 die("usage: slock [-v] [cmd [arg ...]]\n");
328 main(int argc, char **argv) {
337 int s, nlocks, nscreens;
341 fprintf(stderr, "slock-"VERSION"\n");
347 /* validate drop-user and -group */
349 if (!(pwd = getpwnam(user)))
350 die("slock: getpwnam %s: %s\n", user,
351 errno ? strerror(errno) : "user entry not found");
354 if (!(grp = getgrnam(group)))
355 die("slock: getgrnam %s: %s\n", group,
356 errno ? strerror(errno) : "group entry not found");
365 if (!crypt("", hash))
366 die("slock: crypt: %s\n", strerror(errno));
368 if (!(dpy = XOpenDisplay(NULL)))
369 die("slock: cannot open display\n");
371 /* drop privileges */
372 if (setgroups(0, NULL) < 0)
373 die("slock: setgroups: %s\n", strerror(errno));
374 if (setgid(dgid) < 0)
375 die("slock: setgid: %s\n", strerror(errno));
376 if (setuid(duid) < 0)
377 die("slock: setuid: %s\n", strerror(errno));
379 /* check for Xrandr support */
380 rr.active = XRRQueryExtension(dpy, &rr.evbase, &rr.errbase);
382 /* get number of screens in display "dpy" and blank them */
383 nscreens = ScreenCount(dpy);
384 if (!(locks = calloc(nscreens, sizeof(struct lock *))))
385 die("slock: out of memory\n");
386 for (nlocks = 0, s = 0; s < nscreens; s++) {
387 if ((locks[s] = lockscreen(dpy, &rr, s)) != NULL)
394 /* did we manage to lock everything? */
395 if (nlocks != nscreens)
398 /* run post-lock command */
402 die("slock: fork failed: %s\n", strerror(errno));
404 if (close(ConnectionNumber(dpy)) < 0)
405 die("slock: close: %s\n", strerror(errno));
406 execvp(argv[0], argv);
407 fprintf(stderr, "slock: execvp %s: %s\n", argv[0], strerror(errno));
412 /* everything is now blank. Wait for the correct password */
413 readpw(dpy, &rr, locks, nscreens, hash);