2 /* See LICENSE file for license details. */
3 #define _XOPEN_SOURCE 500
16 #include <sys/types.h>
17 #include <X11/keysym.h>
19 #include <X11/Xutil.h>
22 #include <login_cap.h>
30 unsigned long colors[2];
35 static Bool running = True;
38 die(const char *errstr, ...) {
42 vfprintf(stderr, errstr, ap);
54 fd = open("/proc/self/oom_score_adj", O_WRONLY);
55 if (fd < 0 && errno == ENOENT)
57 if (fd < 0 || write(fd, "-1000\n", 6) != 6 || close(fd) != 0)
58 die("cannot disable the out-of-memory killer for this process\n");
64 getpw(void) { /* only run as root */
68 pw = getpwuid(getuid());
70 die("slock: cannot retrieve password entry (make sure to suid or sgid slock)\n");
75 if (strlen(rval) >= 1) { /* kludge, assumes pw placeholder entry has len >= 1 */
77 sp = getspnam(getenv("USER"));
79 die("slock: cannot retrieve shadow entry (make sure to suid or sgid slock)\n");
87 && ((getegid() != pw->pw_gid && setgid(pw->pw_gid) < 0) || setuid(pw->pw_uid) < 0))
88 die("slock: cannot drop privileges\n");
97 readpw(Display *dpy, const char *pws)
100 char buf[32], passwd[256];
102 unsigned int len, llen;
109 /* As "slock" stands for "Simple X display locker", the DPMS settings
110 * had been removed and you can set it with "xset" or some other
111 * utility. This way the user can easily set a customized DPMS
113 while(running && !XNextEvent(dpy, &ev)) {
114 if(ev.type == KeyPress) {
116 num = XLookupString(&ev.xkey, buf, sizeof buf, &ksym, 0);
117 if(IsKeypadKey(ksym)) {
118 if(ksym == XK_KP_Enter)
120 else if(ksym >= XK_KP_0 && ksym <= XK_KP_9)
121 ksym = (ksym - XK_KP_0) + XK_0;
123 if(IsFunctionKey(ksym) || IsKeypadKey(ksym)
124 || IsMiscFunctionKey(ksym) || IsPFKey(ksym)
125 || IsPrivateKeypadKey(ksym))
131 running = !auth_userokay(getlogin(), NULL, "auth-xlock", passwd);
133 running = !!strcmp(crypt(passwd, pws), pws);
147 if(num && !iscntrl((int) buf[0]) && (len + num < sizeof passwd)) {
148 memcpy(passwd + len, buf, num);
153 if(llen == 0 && len != 0) {
154 for(screen = 0; screen < nscreens; screen++) {
155 XSetWindowBackground(dpy, locks[screen]->win, locks[screen]->colors[1]);
156 XClearWindow(dpy, locks[screen]->win);
158 } else if(llen != 0 && len == 0) {
159 for(screen = 0; screen < nscreens; screen++) {
160 XSetWindowBackground(dpy, locks[screen]->win, locks[screen]->colors[0]);
161 XClearWindow(dpy, locks[screen]->win);
166 else for(screen = 0; screen < nscreens; screen++)
167 XRaiseWindow(dpy, locks[screen]->win);
172 unlockscreen(Display *dpy, Lock *lock) {
173 if(dpy == NULL || lock == NULL)
176 XUngrabPointer(dpy, CurrentTime);
177 XFreeColors(dpy, DefaultColormap(dpy, lock->screen), lock->colors, 2, 0);
178 XFreePixmap(dpy, lock->pmap);
179 XDestroyWindow(dpy, lock->win);
185 lockscreen(Display *dpy, int screen) {
186 char curs[] = {0, 0, 0, 0, 0, 0, 0, 0};
190 XSetWindowAttributes wa;
193 if(dpy == NULL || screen < 0)
196 lock = malloc(sizeof(Lock));
200 lock->screen = screen;
202 lock->root = RootWindow(dpy, lock->screen);
205 wa.override_redirect = 1;
206 wa.background_pixel = BlackPixel(dpy, lock->screen);
207 lock->win = XCreateWindow(dpy, lock->root, 0, 0, DisplayWidth(dpy, lock->screen), DisplayHeight(dpy, lock->screen),
208 0, DefaultDepth(dpy, lock->screen), CopyFromParent,
209 DefaultVisual(dpy, lock->screen), CWOverrideRedirect | CWBackPixel, &wa);
210 XAllocNamedColor(dpy, DefaultColormap(dpy, lock->screen), COLOR2, &color, &dummy);
211 lock->colors[1] = color.pixel;
212 XAllocNamedColor(dpy, DefaultColormap(dpy, lock->screen), COLOR1, &color, &dummy);
213 lock->colors[0] = color.pixel;
214 lock->pmap = XCreateBitmapFromData(dpy, lock->win, curs, 8, 8);
215 invisible = XCreatePixmapCursor(dpy, lock->pmap, lock->pmap, &color, &color, 0, 0);
216 XDefineCursor(dpy, lock->win, invisible);
217 XMapRaised(dpy, lock->win);
218 for(len = 1000; len; len--) {
219 if(XGrabPointer(dpy, lock->root, False, ButtonPressMask | ButtonReleaseMask | PointerMotionMask,
220 GrabModeAsync, GrabModeAsync, None, invisible, CurrentTime) == GrabSuccess)
224 if(running && (len > 0)) {
225 for(len = 1000; len; len--) {
226 if(XGrabKeyboard(dpy, lock->root, True, GrabModeAsync, GrabModeAsync, CurrentTime)
233 running &= (len > 0);
235 unlockscreen(dpy, lock);
239 XSelectInput(dpy, lock->root, SubstructureNotifyMask);
246 fprintf(stderr, "usage: slock [-v]\n");
251 main(int argc, char **argv) {
252 #ifndef HAVE_BSD_AUTH
258 if((argc == 2) && !strcmp("-v", argv[1]))
259 die("slock-%s, © 2006-2012 Anselm R Garbe\n", VERSION);
267 if(!getpwuid(getuid()))
268 die("slock: no passwd entry for you\n");
270 #ifndef HAVE_BSD_AUTH
274 if(!(dpy = XOpenDisplay(0)))
275 die("slock: cannot open display\n");
276 /* Get the number of screens in display "dpy" and blank them all. */
277 nscreens = ScreenCount(dpy);
278 locks = malloc(sizeof(Lock *) * nscreens);
280 die("slock: malloc: %s\n", strerror(errno));
282 for(screen = 0; screen < nscreens; screen++) {
283 if ( (locks[screen] = lockscreen(dpy, screen)) != NULL)
288 /* Did we actually manage to lock something? */
289 if (nlocks == 0) { // nothing to protect
295 /* Everything is now blank. Now wait for the correct password. */
302 /* Password ok, unlock everything and quit. */
303 for(screen = 0; screen < nscreens; screen++)
304 unlockscreen(dpy, locks[screen]);