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>
41 unsigned long colors[NUMCOLS];
46 static Bool running = True;
47 static Bool failure = False;
53 die(const char *errstr, ...)
57 fputs("slock: ", stderr);
59 vfprintf(stderr, errstr, ap);
72 fd = open("/proc/self/oom_score_adj", O_WRONLY);
73 if (fd < 0 && errno == ENOENT) {
76 if (fd < 0 || write(fd, "-1000\n", (sizeof("-1000\n") - 1)) !=
77 (sizeof("-1000\n") - 1) || close(fd) != 0) {
78 die("can't tame the oom-killer. is suid or sgid set?\n");
84 /* only run as root */
92 if (!(pw = getpwuid(getuid()))) {
94 die("getpwuid: %s\n", strerror(errno));
96 die("cannot retrieve password entry\n");
101 if (rval[0] == 'x' && rval[1] == '\0') {
103 if (!(sp = getspnam(getenv("USER"))))
104 die("cannot retrieve shadow entry (make sure to suid or sgid slock)\n");
109 /* drop privileges */
110 if (geteuid() == 0 &&
111 ((getegid() != pw->pw_gid && setgid(pw->pw_gid) < 0) || setuid(pw->pw_uid) < 0))
112 die("cannot drop privileges\n");
121 readpw(Display *dpy, const char *pws)
124 char buf[32], passwd[256];
126 unsigned int len, color;
129 static int oldc = INIT;
134 /* As "slock" stands for "Simple X display locker", the DPMS settings
135 * had been removed and you can set it with "xset" or some other
136 * utility. This way the user can easily set a customized DPMS
138 while (running && !XNextEvent(dpy, &ev)) {
139 if (ev.type == KeyPress) {
140 explicit_bzero(&buf, sizeof(buf));
141 num = XLookupString(&ev.xkey, buf, sizeof(buf), &ksym, 0);
142 if (IsKeypadKey(ksym)) {
143 if (ksym == XK_KP_Enter)
145 else if (ksym >= XK_KP_0 && ksym <= XK_KP_9)
146 ksym = (ksym - XK_KP_0) + XK_0;
148 if (IsFunctionKey(ksym) ||
150 IsMiscFunctionKey(ksym) ||
152 IsPrivateKeypadKey(ksym))
158 running = !auth_userokay(getlogin(), NULL, "auth-xlock", passwd);
160 running = !!strcmp(crypt(passwd, pws), pws);
166 explicit_bzero(&passwd, sizeof(passwd));
170 explicit_bzero(&passwd, sizeof(passwd));
178 if (num && !iscntrl((int)buf[0]) && (len + num < sizeof(passwd))) {
179 memcpy(passwd + len, buf, num);
184 color = len ? INPUT : (failure || failonclear ? FAILED : INIT);
185 if (running && oldc != color) {
186 for (screen = 0; screen < nscreens; screen++) {
187 XSetWindowBackground(dpy, locks[screen]->win, locks[screen]->colors[color]);
188 XClearWindow(dpy, locks[screen]->win);
192 } else if (rr && ev.type == rrevbase + RRScreenChangeNotify) {
193 XRRScreenChangeNotifyEvent *rre = (XRRScreenChangeNotifyEvent*)&ev;
194 for (screen = 0; screen < nscreens; screen++) {
195 if (locks[screen]->win == rre->window) {
196 XResizeWindow(dpy, locks[screen]->win, rre->width, rre->height);
197 XClearWindow(dpy, locks[screen]->win);
200 } else for (screen = 0; screen < nscreens; screen++)
201 XRaiseWindow(dpy, locks[screen]->win);
206 unlockscreen(Display *dpy, Lock *lock)
208 if(dpy == NULL || lock == NULL)
211 XUngrabPointer(dpy, CurrentTime);
212 XFreeColors(dpy, DefaultColormap(dpy, lock->screen), lock->colors, NUMCOLS, 0);
213 XFreePixmap(dpy, lock->pmap);
214 XDestroyWindow(dpy, lock->win);
220 lockscreen(Display *dpy, int screen)
222 char curs[] = {0, 0, 0, 0, 0, 0, 0, 0};
227 XSetWindowAttributes wa;
230 if (!running || dpy == NULL || screen < 0 || !(lock = malloc(sizeof(Lock))))
233 lock->screen = screen;
234 lock->root = RootWindow(dpy, lock->screen);
236 for (i = 0; i < NUMCOLS; i++) {
237 XAllocNamedColor(dpy, DefaultColormap(dpy, lock->screen), colorname[i], &color, &dummy);
238 lock->colors[i] = color.pixel;
242 wa.override_redirect = 1;
243 wa.background_pixel = lock->colors[INIT];
244 lock->win = XCreateWindow(dpy, lock->root, 0, 0, DisplayWidth(dpy, lock->screen), DisplayHeight(dpy, lock->screen),
245 0, DefaultDepth(dpy, lock->screen), CopyFromParent,
246 DefaultVisual(dpy, lock->screen), CWOverrideRedirect | CWBackPixel, &wa);
247 lock->pmap = XCreateBitmapFromData(dpy, lock->win, curs, 8, 8);
248 invisible = XCreatePixmapCursor(dpy, lock->pmap, lock->pmap, &color, &color, 0, 0);
249 XDefineCursor(dpy, lock->win, invisible);
250 XMapRaised(dpy, lock->win);
252 XRRSelectInput(dpy, lock->win, RRScreenChangeNotifyMask);
254 /* Try to grab mouse pointer *and* keyboard, else fail the lock */
255 for (len = 1000; len; len--) {
256 if (XGrabPointer(dpy, lock->root, False, ButtonPressMask | ButtonReleaseMask | PointerMotionMask,
257 GrabModeAsync, GrabModeAsync, None, invisible, CurrentTime) == GrabSuccess)
262 fprintf(stderr, "slock: unable to grab mouse pointer for screen %d\n", screen);
264 for (len = 1000; len; len--) {
265 if (XGrabKeyboard(dpy, lock->root, True, GrabModeAsync, GrabModeAsync, CurrentTime) == GrabSuccess) {
266 /* everything fine, we grabbed both inputs */
267 XSelectInput(dpy, lock->root, SubstructureNotifyMask);
272 fprintf(stderr, "slock: unable to grab keyboard for screen %d\n", screen);
274 /* grabbing one of the inputs failed */
276 unlockscreen(dpy, lock);
283 fprintf(stderr, "usage: slock [-v|POST_LOCK_CMD]\n");
288 main(int argc, char **argv) {
289 #ifndef HAVE_BSD_AUTH
295 if ((argc >= 2) && !strcmp("-v", argv[1]))
296 die("version %s, © 2006-2016 slock engineers\n", VERSION);
298 /* treat first argument starting with a '-' as option */
299 if ((argc >= 2) && argv[1][0] == '-')
306 if (!getpwuid(getuid()))
307 die("no passwd entry for you\n");
309 #ifndef HAVE_BSD_AUTH
313 if (!(dpy = XOpenDisplay(0)))
314 die("cannot open display\n");
315 rr = XRRQueryExtension(dpy, &rrevbase, &rrerrbase);
316 /* Get the number of screens in display "dpy" and blank them all. */
317 nscreens = ScreenCount(dpy);
318 if (!(locks = malloc(sizeof(Lock*) * nscreens)))
319 die("Out of memory.\n");
321 for (screen = 0; screen < nscreens; screen++) {
322 if ((locks[screen] = lockscreen(dpy, screen)) != NULL)
327 /* Did we actually manage to lock something? */
328 if (nlocks == 0) { /* nothing to protect */
334 if (argc >= 2 && fork() == 0) {
336 close(ConnectionNumber(dpy));
337 execvp(argv[1], argv+1);
338 die("execvp %s failed: %s\n", argv[1], strerror(errno));
341 /* Everything is now blank. Now wait for the correct password. */
348 /* Password ok, unlock everything and quit. */
349 for (screen = 0; screen < nscreens; screen++)
350 unlockscreen(dpy, locks[screen]);