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/* © 2006-2007 Anselm R. Garbe <garbeam at gmail dot com>
* See LICENSE file for license details. */
#define _XOPEN_SOURCE 500
#if HAVE_SHADOW_H
#include <shadow.h>
#endif
#include <ctype.h>
#include <pwd.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <X11/keysym.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
void
eprint(const char *errstr, ...) {
va_list ap;
va_start(ap, errstr);
vfprintf(stderr, errstr, ap);
va_end(ap);
exit(EXIT_FAILURE);
}
const char *
get_password() { /* only run as root */
const char *rval;
struct passwd *pw;
if(geteuid() != 0)
eprint("slock: cannot retrieve password entry (make sure to suid slock)\n");
pw = getpwuid(getuid());
endpwent();
rval = pw->pw_passwd;
#if HAVE_SHADOW_H
{
struct spwd *sp;
sp = getspnam(getenv("USER"));
endspent();
rval = sp->sp_pwdp;
}
#endif
/* drop privileges */
if(setgid(pw->pw_gid) < 0 || setuid(pw->pw_uid) < 0)
eprint("slock: cannot drop privileges\n");
return rval;
}
int
main(int argc, char **argv) {
char curs[] = {0, 0, 0, 0, 0, 0, 0, 0};
char buf[32], passwd[256];
int num, screen;
const char *pws;
unsigned int len;
Bool running = True;
Cursor invisible;
Display *dpy;
KeySym ksym;
Pixmap pmap;
Window root, w;
XColor black, dummy;
XEvent ev;
XSetWindowAttributes wa;
if((argc == 2) && !strcmp("-v", argv[1]))
eprint("slock-"VERSION", © 2006-2007 Anselm R. Garbe, Sander van Dijk\n");
else if(argc != 1)
eprint("usage: slock [-v]\n");
pws = get_password();
if(!(dpy = XOpenDisplay(0)))
eprint("slock: cannot open display\n");
screen = DefaultScreen(dpy);
root = RootWindow(dpy, screen);
/* init */
wa.override_redirect = 1;
wa.background_pixel = BlackPixel(dpy, screen);
w = XCreateWindow(dpy, root, 0, 0, DisplayWidth(dpy, screen), DisplayHeight(dpy, screen),
0, DefaultDepth(dpy, screen), CopyFromParent,
DefaultVisual(dpy, screen), CWOverrideRedirect | CWBackPixel, &wa);
XAllocNamedColor(dpy, DefaultColormap(dpy, screen), "black", &black, &dummy);
pmap = XCreateBitmapFromData(dpy, w, curs, 8, 8);
invisible = XCreatePixmapCursor(dpy, pmap, pmap, &black, &black, 0, 0);
XDefineCursor(dpy, w, invisible);
XMapRaised(dpy, w);
for(len = 1000; len; len--) {
if(XGrabPointer(dpy, root, False, ButtonPressMask | ButtonReleaseMask | PointerMotionMask,
GrabModeAsync, GrabModeAsync, None, invisible, CurrentTime) == GrabSuccess)
break;
usleep(1000);
}
if((running = running && (len > 0))) {
for(len = 1000; len; len--) {
if(XGrabKeyboard(dpy, root, True, GrabModeAsync, GrabModeAsync, CurrentTime)
== GrabSuccess)
break;
usleep(1000);
}
running = (len > 0);
}
len = 0;
XSync(dpy, False);
/* main event loop */
while(running && !XNextEvent(dpy, &ev))
if(ev.type == KeyPress) {
buf[0] = 0;
num = XLookupString(&ev.xkey, buf, sizeof buf, &ksym, 0);
if(IsFunctionKey(ksym) || IsKeypadKey(ksym)
|| IsMiscFunctionKey(ksym) || IsPFKey(ksym)
|| IsPrivateKeypadKey(ksym))
continue;
switch(ksym) {
case XK_Return:
passwd[len] = 0;
if((running = strcmp(crypt(passwd, pws), pws)) != 0)
XBell(dpy, 100);
len = 0;
break;
case XK_Escape:
len = 0;
break;
case XK_BackSpace:
if(len)
--len;
break;
default:
if(num && !iscntrl((int) buf[0]) && (len + num < sizeof passwd)) {
memcpy(passwd + len, buf, num);
len += num;
}
break;
}
}
XUngrabPointer(dpy, CurrentTime);
XFreePixmap(dpy, pmap);
XDestroyWindow(dpy, w);
XCloseDisplay(dpy);
return 0;
}
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