slock/slock.c

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/* (C)opyright MMVI-MMVII 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
#include <shadow.h>
#endif
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#include <ctype.h>
#include <pwd.h>
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#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>
const char *
get_password() { /* only run as root */
const char *rval;
struct passwd *pw;
if(geteuid() != 0) {
fputs("slock: cannot retrieve password entry (make sure to suid slock)\n", stderr);
exit(EXIT_FAILURE);
}
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) {
fputs("slock: cannot drop privileges\n",stdout);
exit(EXIT_FAILURE);
}
return rval;
}
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int
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;
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;
Pixmap pmap;
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Window 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)) {
fputs("slock-"VERSION", (C)opyright MMVI Anselm R. Garbe\n", stdout);
exit(EXIT_SUCCESS);
}
pws = get_password();
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if(!(dpy = XOpenDisplay(0))) {
fputs("slock: cannot open display\n", stderr);
exit(EXIT_FAILURE);
}
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screen = DefaultScreen(dpy);
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/* init */
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wa.override_redirect = 1;
wa.background_pixel = BlackPixel(dpy, screen);
w = XCreateWindow(dpy, RootWindow(dpy, screen), 0, 0,
DisplayWidth(dpy, screen), DisplayHeight(dpy, screen),
0, DefaultDepth(dpy, screen), CopyFromParent,
DefaultVisual(dpy, screen), CWOverrideRedirect | CWBackPixel, &wa);
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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);
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running = XGrabPointer(dpy, RootWindow(dpy, screen), False,
ButtonPressMask | ButtonReleaseMask | PointerMotionMask,
GrabModeAsync, GrabModeSync, None, invisible, CurrentTime) == GrabSuccess;
len = 10;
for(len = 10; len && (XGrabKeyboard(dpy, RootWindow(dpy, screen), True, GrabModeAsync,
GrabModeAsync, CurrentTime) != GrabSuccess); len--)
usleep(1000);
running = running && (len > 0);
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len = 0;
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XMapRaised(dpy, w);
XSync(dpy, False);
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/* main event loop */
while(running && !XNextEvent(dpy, &ev))
if(ev.type == KeyPress) {
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)
|| IsMiscFunctionKey(ksym) || IsPFKey(ksym)
|| IsPrivateKeypadKey(ksym))
continue;
switch(ksym) {
case XK_Return:
passwd[len] = 0;
if((running = strcmp(crypt(passwd, pws), pws)) != 0)
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XBell(dpy, 100);
len = 0;
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break;
case XK_Escape:
len = 0;
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break;
case XK_BackSpace:
if(len)
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--len;
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break;
default:
if(num && !iscntrl((int) buf[0]) && (len + num < sizeof passwd)) {
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memcpy(passwd + len, buf, num);
len += num;
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}
break;
}
}
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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);
return 0;
}