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/extensions/Xinerama.h>
20 #include <X11/keysym.h>
22 #include <X11/Xutil.h>
23 #include <X11/Xresource.h>
30 /* global count to prevent repeated error messages */
44 unsigned long colors[NUMCOLS];
53 /* Xresources preferences */
62 enum resource_type type;
69 die(const char *errstr, ...)
74 vfprintf(stderr, errstr, ap);
81 #include <linux/oom.h>
87 const char oomfile[] = "/proc/self/oom_score_adj";
89 if (!(f = fopen(oomfile, "w"))) {
92 die("slock: fopen %s: %s\n", oomfile, strerror(errno));
94 fprintf(f, "%d", OOM_SCORE_ADJ_MIN);
97 die("slock: unable to disable OOM killer. "
98 "Make sure to suid or sgid slock.\n");
100 die("slock: fclose %s: %s\n", oomfile, strerror(errno));
106 writemessage(Display *dpy, Window win, int screen)
108 int len, line_len, width, height, s_width, s_height, i, j, k, tab_replace, tab_size;
110 XFontStruct *fontinfo;
112 XineramaScreenInfo *xsi;
114 fontinfo = XLoadQueryFont(dpy, font_name);
116 if (fontinfo == NULL) {
117 if (count_error == 0) {
118 fprintf(stderr, "slock: Unable to load font \"%s\"\n", font_name);
119 fprintf(stderr, "slock: Try listing fonts with 'slock -f'\n");
125 tab_size = 8 * XTextWidth(fontinfo, " ", 1);
127 XAllocNamedColor(dpy, DefaultColormap(dpy, screen),
128 text_color, &color, &dummy);
130 gr_values.font = fontinfo->fid;
131 gr_values.foreground = color.pixel;
132 gc=XCreateGC(dpy,win,GCFont+GCForeground, &gr_values);
134 /* To prevent "Uninitialized" warnings. */
138 * Start formatting and drawing text
141 len = strlen(message);
143 /* Max max line length (cut at '\n') */
146 for (i = j = 0; i < len; i++) {
147 if (message[i] == '\n') {
148 if (i - j > line_len)
155 /* If there is only one line */
159 if (XineramaIsActive(dpy)) {
160 xsi = XineramaQueryScreens(dpy, &i);
161 s_width = xsi[0].width;
162 s_height = xsi[0].height;
164 s_width = DisplayWidth(dpy, screen);
165 s_height = DisplayHeight(dpy, screen);
168 height = s_height*3/7 - (k*20)/3;
169 width = (s_width - XTextWidth(fontinfo, message, line_len))/2;
171 /* Look for '\n' and print the text between them. */
172 for (i = j = k = 0; i <= len; i++) {
173 /* i == len is the special case for the last line */
174 if (i == len || message[i] == '\n') {
176 while (message[j] == '\t' && j < i) {
181 XDrawString(dpy, win, gc, width + tab_size*tab_replace, height + 20*k, message + j, i - j);
182 while (i < len && message[i] == '\n') {
190 /* xsi should not be NULL anyway if Xinerama is active, but to be safe */
191 if (XineramaIsActive(dpy) && xsi != NULL)
203 /* Check if the current user has a password entry */
205 if (!(pw = getpwuid(getuid()))) {
207 die("slock: getpwuid: %s\n", strerror(errno));
209 die("slock: cannot retrieve password entry\n");
211 hash = pw->pw_passwd;
214 if (!strcmp(hash, "x")) {
216 if (!(sp = getspnam(pw->pw_name)))
217 die("slock: getspnam: cannot retrieve shadow entry. "
218 "Make sure to suid or sgid slock.\n");
222 if (!strcmp(hash, "*")) {
224 if (!(pw = getpwuid_shadow(getuid())))
225 die("slock: getpwnam_shadow: cannot retrieve shadow entry. "
226 "Make sure to suid or sgid slock.\n");
227 hash = pw->pw_passwd;
229 die("slock: getpwuid: cannot retrieve shadow entry. "
230 "Make sure to suid or sgid slock.\n");
231 #endif /* __OpenBSD__ */
233 #endif /* HAVE_SHADOW_H */
239 readpw(Display *dpy, struct xrandr *rr, struct lock **locks, int nscreens,
242 XRRScreenChangeNotifyEvent *rre;
243 char buf[32], passwd[256], *inputhash;
244 int num, screen, running, failure, oldc;
245 unsigned int len, color;
254 while (running && !XNextEvent(dpy, &ev)) {
255 if (ev.type == KeyPress) {
256 explicit_bzero(&buf, sizeof(buf));
257 num = XLookupString(&ev.xkey, buf, sizeof(buf), &ksym, 0);
258 if (IsKeypadKey(ksym)) {
259 if (ksym == XK_KP_Enter)
261 else if (ksym >= XK_KP_0 && ksym <= XK_KP_9)
262 ksym = (ksym - XK_KP_0) + XK_0;
264 if (IsFunctionKey(ksym) ||
266 IsMiscFunctionKey(ksym) ||
268 IsPrivateKeypadKey(ksym))
274 if (!(inputhash = crypt(passwd, hash)))
275 fprintf(stderr, "slock: crypt: %s\n", strerror(errno));
277 running = !!strcmp(inputhash, hash);
282 explicit_bzero(&passwd, sizeof(passwd));
286 explicit_bzero(&passwd, sizeof(passwd));
291 passwd[--len] = '\0';
294 if (num && !iscntrl((int)buf[0]) &&
295 (len + num < sizeof(passwd))) {
296 memcpy(passwd + len, buf, num);
301 color = len ? INPUT : ((failure || failonclear) ? FAILED : INIT);
302 if (running && oldc != color) {
303 for (screen = 0; screen < nscreens; screen++) {
304 XSetWindowBackground(dpy,
306 locks[screen]->colors[color]);
307 XClearWindow(dpy, locks[screen]->win);
308 writemessage(dpy, locks[screen]->win, screen);
312 } else if (rr->active && ev.type == rr->evbase + RRScreenChangeNotify) {
313 rre = (XRRScreenChangeNotifyEvent*)&ev;
314 for (screen = 0; screen < nscreens; screen++) {
315 if (locks[screen]->win == rre->window) {
316 if (rre->rotation == RR_Rotate_90 ||
317 rre->rotation == RR_Rotate_270)
318 XResizeWindow(dpy, locks[screen]->win,
319 rre->height, rre->width);
321 XResizeWindow(dpy, locks[screen]->win,
322 rre->width, rre->height);
323 XClearWindow(dpy, locks[screen]->win);
328 for (screen = 0; screen < nscreens; screen++)
329 XRaiseWindow(dpy, locks[screen]->win);
335 lockscreen(Display *dpy, struct xrandr *rr, int screen)
337 char curs[] = {0, 0, 0, 0, 0, 0, 0, 0};
338 int i, ptgrab, kbgrab;
341 XSetWindowAttributes wa;
344 if (dpy == NULL || screen < 0 || !(lock = malloc(sizeof(struct lock))))
347 lock->screen = screen;
348 lock->root = RootWindow(dpy, lock->screen);
350 for (i = 0; i < NUMCOLS; i++) {
351 XAllocNamedColor(dpy, DefaultColormap(dpy, lock->screen),
352 colorname[i], &color, &dummy);
353 lock->colors[i] = color.pixel;
357 wa.override_redirect = 1;
358 wa.background_pixel = lock->colors[INIT];
359 lock->win = XCreateWindow(dpy, lock->root, 0, 0,
360 DisplayWidth(dpy, lock->screen),
361 DisplayHeight(dpy, lock->screen),
362 0, DefaultDepth(dpy, lock->screen),
364 DefaultVisual(dpy, lock->screen),
365 CWOverrideRedirect | CWBackPixel, &wa);
366 lock->pmap = XCreateBitmapFromData(dpy, lock->win, curs, 8, 8);
367 invisible = XCreatePixmapCursor(dpy, lock->pmap, lock->pmap,
368 &color, &color, 0, 0);
369 XDefineCursor(dpy, lock->win, invisible);
371 /* Try to grab mouse pointer *and* keyboard for 600ms, else fail the lock */
372 for (i = 0, ptgrab = kbgrab = -1; i < 6; i++) {
373 if (ptgrab != GrabSuccess) {
374 ptgrab = XGrabPointer(dpy, lock->root, False,
375 ButtonPressMask | ButtonReleaseMask |
376 PointerMotionMask, GrabModeAsync,
377 GrabModeAsync, None, invisible, CurrentTime);
379 if (kbgrab != GrabSuccess) {
380 kbgrab = XGrabKeyboard(dpy, lock->root, True,
381 GrabModeAsync, GrabModeAsync, CurrentTime);
384 /* input is grabbed: we can lock the screen */
385 if (ptgrab == GrabSuccess && kbgrab == GrabSuccess) {
386 XMapRaised(dpy, lock->win);
388 XRRSelectInput(dpy, lock->win, RRScreenChangeNotifyMask);
390 XSelectInput(dpy, lock->root, SubstructureNotifyMask);
394 /* retry on AlreadyGrabbed but fail on other errors */
395 if ((ptgrab != AlreadyGrabbed && ptgrab != GrabSuccess) ||
396 (kbgrab != AlreadyGrabbed && kbgrab != GrabSuccess))
402 /* we couldn't grab all input: fail out */
403 if (ptgrab != GrabSuccess)
404 fprintf(stderr, "slock: unable to grab mouse pointer for screen %d\n",
406 if (kbgrab != GrabSuccess)
407 fprintf(stderr, "slock: unable to grab keyboard for screen %d\n",
413 resource_load(XrmDatabase db, char *name, enum resource_type rtype, void *dst)
424 snprintf(fullname, sizeof(fullname), "%s.%s", "slock", name);
425 snprintf(fullclass, sizeof(fullclass), "%s.%s", "Slock", name);
426 fullname[sizeof(fullname) - 1] = fullclass[sizeof(fullclass) - 1] = '\0';
428 XrmGetResource(db, fullname, fullclass, &type, &ret);
429 if (ret.addr == NULL || strncmp("String", type, 64))
437 *idst = strtoul(ret.addr, NULL, 10);
440 *fdst = strtof(ret.addr, NULL);
447 config_init(Display *dpy)
454 resm = XResourceManagerString(dpy);
458 db = XrmGetStringDatabase(resm);
459 for (p = resources; p < resources + LEN(resources); p++)
460 resource_load(db, p->name, p->type, p->dst);
466 die("usage: slock [-v] [-f] [-m message] [cmd [arg ...]]\n");
470 main(int argc, char **argv) {
479 int i, s, nlocks, nscreens;
485 fprintf(stderr, "slock-"VERSION"\n");
488 message = EARGF(usage());
491 if (!(dpy = XOpenDisplay(NULL)))
492 die("slock: cannot open display\n");
493 font_names = XListFonts(dpy, "*", 10000 /* list 10000 fonts*/, &count_fonts);
494 for (i=0; i<count_fonts; i++) {
495 fprintf(stderr, "%s\n", *(font_names+i));
502 /* validate drop-user and -group */
504 if (!(pwd = getpwnam(user)))
505 die("slock: getpwnam %s: %s\n", user,
506 errno ? strerror(errno) : "user entry not found");
509 if (!(grp = getgrnam(group)))
510 die("slock: getgrnam %s: %s\n", group,
511 errno ? strerror(errno) : "group entry not found");
520 if (!crypt("", hash))
521 die("slock: crypt: %s\n", strerror(errno));
523 if (!(dpy = XOpenDisplay(NULL)))
524 die("slock: cannot open display\n");
526 /* drop privileges */
527 if (setgroups(0, NULL) < 0)
528 die("slock: setgroups: %s\n", strerror(errno));
529 if (setgid(dgid) < 0)
530 die("slock: setgid: %s\n", strerror(errno));
531 if (setuid(duid) < 0)
532 die("slock: setuid: %s\n", strerror(errno));
536 /* check for Xrandr support */
537 rr.active = XRRQueryExtension(dpy, &rr.evbase, &rr.errbase);
539 /* get number of screens in display "dpy" and blank them */
540 nscreens = ScreenCount(dpy);
541 if (!(locks = calloc(nscreens, sizeof(struct lock *))))
542 die("slock: out of memory\n");
543 for (nlocks = 0, s = 0; s < nscreens; s++) {
544 if ((locks[s] = lockscreen(dpy, &rr, s)) != NULL) {
545 writemessage(dpy, locks[s]->win, s);
553 /* did we manage to lock everything? */
554 if (nlocks != nscreens)
557 /* run post-lock command */
561 die("slock: fork failed: %s\n", strerror(errno));
563 if (close(ConnectionNumber(dpy)) < 0)
564 die("slock: close: %s\n", strerror(errno));
565 execvp(argv[0], argv);
566 fprintf(stderr, "slock: execvp %s: %s\n", argv[0], strerror(errno));
571 /* everything is now blank. Wait for the correct password */
572 readpw(dpy, &rr, locks, nscreens, hash);