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