145 lines
3.5 KiB
C
145 lines
3.5 KiB
C
/* © 2006-2007 Anselm R. Garbe <garbeam at gmail dot com>
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* See LICENSE file for license details. */
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#define _XOPEN_SOURCE 500
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#if HAVE_SHADOW_H
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#include <shadow.h>
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#endif
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#include <ctype.h>
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#include <pwd.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <X11/keysym.h>
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#include <X11/Xlib.h>
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#include <X11/Xutil.h>
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void
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eprint(const char *errstr, ...) {
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va_list ap;
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va_start(ap, errstr);
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vfprintf(stderr, errstr, ap);
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va_end(ap);
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exit(EXIT_FAILURE);
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}
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const char *
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get_password() { /* only run as root */
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const char *rval;
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struct passwd *pw;
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if(geteuid() != 0)
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eprint("slock: cannot retrieve password entry (make sure to suid slock)\n");
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pw = getpwuid(getuid());
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endpwent();
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rval = pw->pw_passwd;
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#if HAVE_SHADOW_H
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{
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struct spwd *sp;
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sp = getspnam(getenv("USER"));
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endspent();
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rval = sp->sp_pwdp;
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}
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#endif
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/* drop privileges */
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if(setgid(pw->pw_gid) < 0 || setuid(pw->pw_uid) < 0)
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eprint("slock: cannot drop privileges\n");
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return rval;
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}
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int
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main(int argc, char **argv) {
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char curs[] = {0, 0, 0, 0, 0, 0, 0, 0};
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char buf[32], passwd[256];
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int num, screen;
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const char *pws;
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unsigned int len;
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Bool running = True;
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Cursor invisible;
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Display *dpy;
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KeySym ksym;
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Pixmap pmap;
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Window root, w;
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XColor black, dummy;
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XEvent ev;
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XSetWindowAttributes wa;
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if((argc > 1) && !strncmp(argv[1], "-v", 3))
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eprint("slock-"VERSION", © 2006-2007 Anselm R. Garbe, Sander van Dijk\n");
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pws = get_password();
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if(!(dpy = XOpenDisplay(0)))
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eprint("slock: cannot open display\n");
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screen = DefaultScreen(dpy);
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root = RootWindow(dpy, screen);
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/* init */
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wa.override_redirect = 1;
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wa.background_pixel = BlackPixel(dpy, screen);
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w = XCreateWindow(dpy, root, 0, 0, DisplayWidth(dpy, screen), DisplayHeight(dpy, screen),
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0, DefaultDepth(dpy, screen), CopyFromParent,
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DefaultVisual(dpy, screen), CWOverrideRedirect | CWBackPixel, &wa);
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XAllocNamedColor(dpy, DefaultColormap(dpy, screen), "black", &black, &dummy);
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pmap = XCreateBitmapFromData(dpy, w, curs, 8, 8);
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invisible = XCreatePixmapCursor(dpy, pmap, pmap, &black, &black, 0, 0);
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XDefineCursor(dpy, w, invisible);
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XMapRaised(dpy, w);
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for(len = 1000; len; len--) {
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if(XGrabPointer(dpy, root, False, ButtonPressMask | ButtonReleaseMask | PointerMotionMask,
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GrabModeAsync, GrabModeAsync, None, invisible, CurrentTime) == GrabSuccess)
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break;
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usleep(1000);
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}
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if((running = running && (len > 0))) {
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for(len = 1000; len; len--) {
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if(XGrabKeyboard(dpy, root, True, GrabModeAsync, GrabModeAsync, CurrentTime)
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== GrabSuccess)
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break;
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usleep(1000);
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}
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running = (len > 0);
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}
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len = 0;
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XSync(dpy, False);
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/* main event loop */
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while(running && !XNextEvent(dpy, &ev))
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if(ev.type == KeyPress) {
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buf[0] = 0;
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num = XLookupString(&ev.xkey, buf, sizeof buf, &ksym, 0);
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if(IsFunctionKey(ksym) || IsKeypadKey(ksym)
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|| IsMiscFunctionKey(ksym) || IsPFKey(ksym)
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|| IsPrivateKeypadKey(ksym))
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continue;
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switch(ksym) {
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case XK_Return:
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passwd[len] = 0;
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if((running = strcmp(crypt(passwd, pws), pws)) != 0)
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XBell(dpy, 100);
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len = 0;
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break;
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case XK_Escape:
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len = 0;
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break;
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case XK_BackSpace:
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if(len)
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--len;
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break;
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default:
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if(num && !iscntrl((int) buf[0]) && (len + num < sizeof passwd)) {
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memcpy(passwd + len, buf, num);
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len += num;
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}
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break;
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}
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}
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XUngrabPointer(dpy, CurrentTime);
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XFreePixmap(dpy, pmap);
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XDestroyWindow(dpy, w);
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XCloseDisplay(dpy);
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return 0;
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}
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