slock.c

   1 /* (C)opyright MMIV-MMV Anselm R. Garbe <garbeam at gmail dot com>
   2  * See LICENSE file for license details.
   3  */
   4 #define _XOPEN_SOURCE
   5 #include <shadow.h>
   6 #include <stdlib.h>
   7 #include <stdio.h>
   8 #include <string.h>
   9 #include <unistd.h>
  10 #include <sys/types.h>
  11 #include <X11/keysym.h>
  12 #include <X11/Xlib.h>
  13 #include <X11/Xutil.h>
  14
  15 int
  16 main(int argc, char **argv) {
  17         char curs[] = {0, 0, 0, 0, 0, 0, 0, 0};
  18         char buf[32], passwd[256];
  19         int num, prev_nitem, screen;
  20         struct spwd *sp;
  21         unsigned int i, len;
  22         Bool running = True;
  23         Cursor invisible;
  24         Display *dpy;
  25         KeySym ksym;
  26         Pixmap pmap;
  27         Window w;
  28         XColor black, dummy;
  29         XEvent ev;
  30         XSetWindowAttributes wa;
  31
  32         if((argc > 1) && !strncmp(argv[1], "-v", 3)) {
  33                 fputs("slock-"VERSION", (C)opyright MMVI Anselm R. Garbe\n", stdout);
  34                 exit(EXIT_SUCCESS);
  35         }
  36         if(!(sp = getspnam(getenv("USER")))) {
  37                 fputs("slock: cannot retrieve password entry (make sure to suid slock)\n", stderr);
  38                 exit(EXIT_FAILURE);
  39         }
  40         endspent();
  41         if(!(dpy = XOpenDisplay(0))) {
  42                 fputs("slock: cannot open display\n", stderr);
  43                 exit(EXIT_FAILURE);
  44         }
  45         screen = DefaultScreen(dpy);
  46
  47         /* init */
  48         passwd[0] = 0;
  49         while(XGrabKeyboard(dpy, RootWindow(dpy, screen), True, GrabModeAsync,
  50                          GrabModeAsync, CurrentTime) != GrabSuccess)
  51                 usleep(1000);
  52
  53         wa.override_redirect = 1;
  54         wa.background_pixel = BlackPixel(dpy, screen);
  55         w = XCreateWindow(dpy, RootWindow(dpy, screen), 0, 0,
  56                         DisplayWidth(dpy, screen), DisplayHeight(dpy, screen),
  57                         0, DefaultDepth(dpy, screen), CopyFromParent,
  58                         DefaultVisual(dpy, screen), CWOverrideRedirect | CWBackPixel, &wa);
  59
  60         XAllocNamedColor(dpy, DefaultColormap(dpy, screen), "black", &black, &dummy);
  61         pmap = XCreateBitmapFromData(dpy, w, curs, 8, 8);
  62         invisible = XCreatePixmapCursor(dpy, pmap, pmap, &black, &black, 0, 0);
  63         XDefineCursor(dpy, w, invisible);
  64         XMapRaised(dpy, w);
  65         XSync(dpy, False);
  66
  67         /* main event loop */
  68         while(running && !XNextEvent(dpy, &ev))
  69                 if(ev.type == KeyPress) {
  70                         len = strlen(passwd);
  71                         buf[0] = 0;
  72                         num = XLookupString(&ev.xkey, buf, sizeof(buf), &ksym, 0);
  73                         if(IsFunctionKey(ksym) || IsKeypadKey(ksym)
  74                                         || IsMiscFunctionKey(ksym) || IsPFKey(ksym)
  75                                         || IsPrivateKeypadKey(ksym))
  76                                 continue;
  77                         /* first check if a control mask is omitted */
  78                         if(ev.xkey.state & ControlMask) {
  79                                 switch (ksym) {
  80                                 case XK_h:
  81                                 case XK_H: ksym = XK_BackSpace;
  82                                         break;
  83                                 case XK_u:
  84                                 case XK_U: passwd[0] = 0;
  85                                         continue;
  86                                 }
  87                         }
  88                         switch(ksym) {
  89                         case XK_Return:
  90                                 if((running = strncmp(crypt(passwd, sp->sp_pwdp), sp->sp_pwdp, sizeof(passwd))))
  91                                         XBell(dpy, 100);
  92                                 passwd[0] = 0;
  93                                 break;
  94                         case XK_Escape:
  95                                 passwd[0] = 0;
  96                                 break;
  97                         case XK_BackSpace:
  98                                 if(len)
  99                                         passwd[--len] = 0;
 100                                 break;
 101                         default:
 102                                 if(num && !iscntrl((int) buf[0])) {
 103                                         buf[num] = 0;
 104                                         if(len)
 105                                                 strncat(passwd, buf, sizeof(passwd));
 106                                         else
 107                                                 strncpy(passwd, buf, sizeof(passwd));
 108                                 }
 109                                 break;
 110                         }
 111                 }
 112         XFreePixmap(dpy, pmap);
 113         XDestroyWindow(dpy, w);
 114         XCloseDisplay(dpy);
 115         return 0;
 116 }