slock/slock.c

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C
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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 <errno.h>
#include <pwd.h>
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#include <stdarg.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>
#if HAVE_BSD_AUTH
#include <login_cap.h>
#include <bsd_auth.h>
#endif
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struct st_lock {
int screen;
Window root, w;
Pixmap pmap;
};
extern const char *__progname;
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static void
die(const char *errstr, ...) {
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va_list ap;
fprintf(stderr, "%s: ", __progname);
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va_start(ap, errstr);
vfprintf(stderr, errstr, ap);
va_end(ap);
fprintf(stderr, "\n");
fflush(stderr);
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exit(EXIT_FAILURE);
}
#ifndef HAVE_BSD_AUTH
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static const char *
getpw(void) { /* only run as root */
const char *rval;
struct passwd *pw;
pw = getpwuid(getuid());
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if(!pw)
die("cannot retrieve password entry (make sure to suid or sgid slock)");
endpwent();
rval = pw->pw_passwd;
#if HAVE_SHADOW_H
{
struct spwd *sp;
sp = getspnam(getenv("USER"));
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if(!sp)
die("slock: cannot retrieve shadow entry (make sure to suid or sgid slock)\n");
endspent();
rval = sp->sp_pwdp;
}
#endif
/* drop privileges */
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if(setgid(pw->pw_gid) < 0 || setuid(pw->pw_uid) < 0)
die("cannot drop privileges");
return rval;
}
#endif
static void
#ifdef HAVE_BSD_AUTH
readpw(Display *dpy)
#else
readpw(Display *dpy, const char *pws)
#endif
{
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char buf[32], passwd[256];
int num;
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unsigned int len;
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Bool running = True;
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KeySym ksym;
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XEvent ev;
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len = 0;
running = True;
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/* As "slock" stands for "Simple X display locker", the DPMS settings
* had been removed and you can set it with "xset" or some other
* utility. This way the user can easily set a customized DPMS
* timeout. */
while(running && !XNextEvent(dpy, &ev)) {
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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(IsKeypadKey(ksym)) {
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if(ksym == XK_KP_Enter)
ksym = XK_Return;
else if(ksym >= XK_KP_0 && ksym <= XK_KP_9)
ksym = (ksym - XK_KP_0) + XK_0;
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}
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if(IsFunctionKey(ksym) || IsKeypadKey(ksym)
|| IsMiscFunctionKey(ksym) || IsPFKey(ksym)
|| IsPrivateKeypadKey(ksym))
continue;
switch(ksym) {
case XK_Return:
passwd[len] = 0;
#ifdef HAVE_BSD_AUTH
running = !auth_userokay(getlogin(), NULL, "auth-xlock", passwd);
#else
running = strcmp(crypt(passwd, pws), pws);
#endif
if (running != 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;
}
}
}
}
static void
unlockscreen(Display *dpy, struct st_lock *lock) {
if (dpy == NULL || lock == NULL)
return;
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XUngrabPointer(dpy, CurrentTime);
XFreePixmap(dpy, lock->pmap);
XDestroyWindow(dpy, lock->w);
free(lock);
}
static struct st_lock *
lockscreen(Display *dpy, int screen) {
char curs[] = {0, 0, 0, 0, 0, 0, 0, 0};
unsigned int len;
struct st_lock *lock;
Bool running = True;
XColor black, dummy;
XSetWindowAttributes wa;
Cursor invisible;
if (dpy == NULL || screen < 0)
return NULL;
lock = malloc(sizeof(struct st_lock));
if (lock == NULL)
return NULL;
lock->screen = screen;
lock->root = RootWindow(dpy, lock->screen);
/* init */
wa.override_redirect = 1;
wa.background_pixel = BlackPixel(dpy, lock->screen);
lock->w = XCreateWindow(dpy, lock->root, 0, 0, DisplayWidth(dpy, lock->screen), DisplayHeight(dpy, lock->screen),
0, DefaultDepth(dpy, lock->screen), CopyFromParent,
DefaultVisual(dpy, lock->screen), CWOverrideRedirect | CWBackPixel, &wa);
XAllocNamedColor(dpy, DefaultColormap(dpy, lock->screen), "black", &black, &dummy);
lock->pmap = XCreateBitmapFromData(dpy, lock->w, curs, 8, 8);
invisible = XCreatePixmapCursor(dpy, lock->pmap, lock->pmap, &black, &black, 0, 0);
XDefineCursor(dpy, lock->w, invisible);
XMapRaised(dpy, lock->w);
for(len = 1000; len; len--) {
if(XGrabPointer(dpy, lock->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, lock->root, True, GrabModeAsync, GrabModeAsync, CurrentTime)
== GrabSuccess)
break;
usleep(1000);
}
running = (len > 0);
}
if (!running) {
unlockscreen(dpy, lock);
lock = NULL;
}
return lock;
}
static void
usage(void) {
fprintf(stderr, "usage: %s -v", __progname);
exit(EXIT_FAILURE);
}
static int
xerrordummy(Display *dpy, XErrorEvent *ee) {
return 0;
}
int
main(int argc, char **argv) {
#ifndef HAVE_BSD_AUTH
const char *pws;
#endif
Display *dpy;
int nscreens, screen;
struct st_lock **locks;
if((argc == 2) && !strcmp("-v", argv[1]))
die("slock-%s, © 2006-2012 Anselm R Garbe", VERSION);
else if(argc != 1)
usage();
if(!getpwuid(getuid()))
die("no passwd entry for you");
#ifndef HAVE_BSD_AUTH
pws = getpw();
#endif
if(!(dpy = XOpenDisplay(0)))
die("cannot open display");
/* prevent default error handler to take over */
XSetErrorHandler(xerrordummy);
/* Get the number of screens in display "dpy" and blank them all. */
nscreens = ScreenCount(dpy);
locks = malloc(sizeof(struct st_lock *) * nscreens);
if (locks == NULL)
die("malloc: %s", strerror(errno));
for (screen = 0; screen < nscreens; screen++)
locks[screen] = lockscreen(dpy, screen);
XSync(dpy, False);
/* Everything is now blank. Now wait for the correct password. */
#ifdef HAVE_BSD_AUTH
readpw(dpy);
#else
readpw(dpy, pws);
#endif
/* Password ok, unlock everything and quit. */
for (screen = 0; screen < nscreens; screen++)
unlockscreen(dpy, locks[screen]);
free(locks);
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XCloseDisplay(dpy);
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return 0;
}