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/cursorfont.h>
  12 #include <X11/keysym.h>
  13 #include <X11/Xlib.h>
  14 #include <X11/Xutil.h>
  15
  16 int
  17 main(int argc, char **argv) {
  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         KeySym ksym;
  24         Display *dpy;
  25         Window w;
  26         XEvent ev;
  27         XSetWindowAttributes wa;
  28
  29         if((argc > 1) && !strncmp(argv[1], "-v", 3)) {
  30                 fputs("slock-"VERSION", (C)opyright MMVI Anselm R. Garbe\n", stdout);
  31                 exit(EXIT_SUCCESS);
  32         }
  33         if(!(sp = getspnam(getenv("USER")))) {
  34                 fputs("slock: cannot retrieve password entry (make sure to suid slock)\n", stderr);
  35                 exit(EXIT_FAILURE);
  36         }
  37         endspent();
  38         if(!(dpy = XOpenDisplay(0))) {
  39                 fputs("slock: cannot open display\n", stderr);
  40                 exit(EXIT_FAILURE);
  41         }
  42         screen = DefaultScreen(dpy);
  43
  44         /* init */
  45         passwd[0] = 0;
  46         while(XGrabKeyboard(dpy, RootWindow(dpy, screen), True, GrabModeAsync,
  47                          GrabModeAsync, CurrentTime) != GrabSuccess)
  48                 usleep(1000);
  49
  50         wa.override_redirect = 1;
  51         wa.background_pixel = BlackPixel(dpy, screen);
  52         w = XCreateWindow(dpy, RootWindow(dpy, screen), 0, 0,
  53                         DisplayWidth(dpy, screen), DisplayHeight(dpy, screen),
  54                         0, DefaultDepth(dpy, screen), CopyFromParent,
  55                         DefaultVisual(dpy, screen), CWOverrideRedirect | CWBackPixel, &wa);
  56
  57         XDefineCursor(dpy, w, XCreateFontCursor(dpy, XC_coffee_mug));
  58         XMapRaised(dpy, w);
  59         XSync(dpy, False);
  60
  61         /* main event loop */
  62         while(running && !XNextEvent(dpy, &ev))
  63                 if(ev.type == KeyPress) {
  64                         len = strlen(passwd);
  65                         buf[0] = 0;
  66                         num = XLookupString(&ev.xkey, buf, sizeof(buf), &ksym, 0);
  67                         if(IsFunctionKey(ksym) || IsKeypadKey(ksym)
  68                                         || IsMiscFunctionKey(ksym) || IsPFKey(ksym)
  69                                         || IsPrivateKeypadKey(ksym))
  70                                 continue;
  71                         /* first check if a control mask is omitted */
  72                         if(ev.xkey.state & ControlMask) {
  73                                 switch (ksym) {
  74                                 case XK_h:
  75                                 case XK_H: ksym = XK_BackSpace;
  76                                         break;
  77                                 case XK_u:
  78                                 case XK_U: passwd[0] = 0;
  79                                         continue;
  80                                 }
  81                         }
  82                         switch(ksym) {
  83                         case XK_Return:
  84                                 if((running = strncmp(crypt(passwd, sp->sp_pwdp), sp->sp_pwdp, sizeof(passwd))))
  85                                         XBell(dpy, 100);
  86                                 passwd[0] = 0;
  87                                 break;
  88                         case XK_Escape:
  89                                 passwd[0] = 0;
  90                                 break;
  91                         case XK_BackSpace:
  92                                 if(len)
  93                                         passwd[--len] = 0;
  94                                 break;
  95                         default:
  96                                 if(num && !iscntrl((int) buf[0])) {
  97                                         buf[num] = 0;
  98                                         if(len)
  99                                                 strncat(passwd, buf, sizeof(passwd));
 100                                         else
 101                                                 strncpy(passwd, buf, sizeof(passwd));
 102                                 }
 103                                 break;
 104                         }
 105                 }
 106         XDestroyWindow(dpy, w);
 107         XCloseDisplay(dpy);
 108         return 0;
 109 }