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 buf[32], passwd[256];
  18         int num, prev_nitem, screen;
  19         struct spwd *sp;
  20         unsigned int i, len;
  21         Bool running = True;
  22         KeySym ksym;
  23         Display *dpy;
  24         Window w;
  25         XEvent ev;
  26         XSetWindowAttributes wa;
  27
  28         if((argc > 1) && !strncmp(argv[1], "-v", 3)) {
  29                 fputs("slock-"VERSION", (C)opyright MMVI Anselm R. Garbe\n", stdout);
  30                 exit(EXIT_SUCCESS);
  31         }
  32         if(!(sp = getspnam(getenv("USER")))) {
  33                 fputs("slock: cannot retrieve password entry (make sure to suid slock)\n", stderr);
  34                 exit(EXIT_FAILURE);
  35         }
  36         endspent();
  37         if(!(dpy = XOpenDisplay(0))) {
  38                 fputs("slock: cannot open display\n", stderr);
  39                 exit(EXIT_FAILURE);
  40         }
  41         screen = DefaultScreen(dpy);
  42
  43         /* init */
  44         passwd[0] = 0;
  45         while(XGrabKeyboard(dpy, RootWindow(dpy, screen), True, GrabModeAsync,
  46                          GrabModeAsync, CurrentTime) != GrabSuccess)
  47                 usleep(1000);
  48
  49         wa.override_redirect = 1;
  50         wa.background_pixel = BlackPixel(dpy, screen);
  51         w = XCreateWindow(dpy, RootWindow(dpy, screen), 0, 0,
  52                         DisplayWidth(dpy, screen), DisplayHeight(dpy, screen),
  53                         0, DefaultDepth(dpy, screen), CopyFromParent,
  54                         DefaultVisual(dpy, screen), CWOverrideRedirect | CWBackPixel, &wa);
  55         XMapRaised(dpy, w);
  56         XSync(dpy, False);
  57
  58         /* main event loop */
  59         while(running && !XNextEvent(dpy, &ev))
  60                 if(ev.type == KeyPress) {
  61                         len = strlen(passwd);
  62                         buf[0] = 0;
  63                         num = XLookupString(&ev.xkey, buf, sizeof(buf), &ksym, 0);
  64                         if(IsFunctionKey(ksym) || IsKeypadKey(ksym)
  65                                         || IsMiscFunctionKey(ksym) || IsPFKey(ksym)
  66                                         || IsPrivateKeypadKey(ksym))
  67                                 continue;
  68                         /* first check if a control mask is omitted */
  69                         if(ev.xkey.state & ControlMask) {
  70                                 switch (ksym) {
  71                                 case XK_h:
  72                                 case XK_H: ksym = XK_BackSpace;
  73                                         break;
  74                                 case XK_u:
  75                                 case XK_U: passwd[0] = 0;
  76                                         continue;
  77                                 }
  78                         }
  79                         switch(ksym) {
  80                         case XK_Return:
  81                                 if((running = strncmp(crypt(passwd, sp->sp_pwdp), sp->sp_pwdp, sizeof(passwd))))
  82                                         XBell(dpy, 100);
  83                                 passwd[0] = 0;
  84                                 break;
  85                         case XK_Escape:
  86                                 passwd[0] = 0;
  87                                 break;
  88                         case XK_BackSpace:
  89                                 if(len)
  90                                         passwd[--len] = 0;
  91                                 break;
  92                         default:
  93                                 if(num && !iscntrl((int) buf[0])) {
  94                                         buf[num] = 0;
  95                                         if(len)
  96                                                 strncat(passwd, buf, sizeof(passwd));
  97                                         else
  98                                                 strncpy(passwd, buf, sizeof(passwd));
  99                                 }
 100                                 break;
 101                         }
 102                 }
 103         XDestroyWindow(dpy, w);
 104         XCloseDisplay(dpy);
 105         return 0;
 106 }