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 500
   5
   6 #if HAVE_SHADOW_H
   7 #include <shadow.h>
   8 #else
   9 #include <pwd.h>
  10 #endif
  11
  12 #include <ctype.h>
  13 #include <stdlib.h>
  14 #include <stdio.h>
  15 #include <string.h>
  16 #include <unistd.h>
  17 #include <sys/types.h>
  18 #include <X11/keysym.h>
  19 #include <X11/Xlib.h>
  20 #include <X11/Xutil.h>
  21
  22 int
  23 main(int argc, char **argv) {
  24         char curs[] = {0, 0, 0, 0, 0, 0, 0, 0};
  25         char buf[32], passwd[256];
  26         int num, screen;
  27 #if HAVE_SHADOW_H
  28         struct spwd *sp;
  29 #else
  30         struct passwd *pw;
  31 #endif
  32         unsigned int len;
  33         Bool running = True;
  34         Cursor invisible;
  35         Display *dpy;
  36         KeySym ksym;
  37         Pixmap pmap;
  38         Window w;
  39         XColor black, dummy;
  40         XEvent ev;
  41         XSetWindowAttributes wa;
  42
  43         if((argc > 1) && !strncmp(argv[1], "-v", 3)) {
  44                 fputs("slock-"VERSION", (C)opyright MMVI Anselm R. Garbe\n", stdout);
  45                 exit(EXIT_SUCCESS);
  46         }
  47         if(geteuid() != 0) {
  48                 fputs("slock: cannot retrieve password entry (make sure to suid slock)\n", stderr);
  49                 exit(EXIT_FAILURE);
  50         }
  51 #if HAVE_SHADOW_H
  52         sp = getspnam(getenv("USER"));
  53         endspent();
  54 #else
  55         pw = getpwuid(getuid());
  56         endpwent();
  57 #endif
  58         if(!(dpy = XOpenDisplay(0))) {
  59                 fputs("slock: cannot open display\n", stderr);
  60                 exit(EXIT_FAILURE);
  61         }
  62         screen = DefaultScreen(dpy);
  63
  64         /* init */
  65         passwd[0] = 0;
  66         while(XGrabKeyboard(dpy, RootWindow(dpy, screen), True, GrabModeAsync,
  67                          GrabModeAsync, CurrentTime) != GrabSuccess)
  68                 usleep(1000);
  69
  70         wa.override_redirect = 1;
  71         wa.background_pixel = BlackPixel(dpy, screen);
  72         w = XCreateWindow(dpy, RootWindow(dpy, screen), 0, 0,
  73                         DisplayWidth(dpy, screen), DisplayHeight(dpy, screen),
  74                         0, DefaultDepth(dpy, screen), CopyFromParent,
  75                         DefaultVisual(dpy, screen), CWOverrideRedirect | CWBackPixel, &wa);
  76
  77         XAllocNamedColor(dpy, DefaultColormap(dpy, screen), "black", &black, &dummy);
  78         pmap = XCreateBitmapFromData(dpy, w, curs, 8, 8);
  79         invisible = XCreatePixmapCursor(dpy, pmap, pmap, &black, &black, 0, 0);
  80         XDefineCursor(dpy, w, invisible);
  81         XMapRaised(dpy, w);
  82         XSync(dpy, False);
  83
  84         /* main event loop */
  85         while(running && !XNextEvent(dpy, &ev))
  86                 if(ev.type == KeyPress) {
  87                         len = strlen(passwd);
  88                         buf[0] = 0;
  89                         num = XLookupString(&ev.xkey, buf, sizeof(buf), &ksym, 0);
  90                         if(IsFunctionKey(ksym) || IsKeypadKey(ksym)
  91                                         || IsMiscFunctionKey(ksym) || IsPFKey(ksym)
  92                                         || IsPrivateKeypadKey(ksym))
  93                                 continue;
  94                         /* first check if a control mask is omitted */
  95                         if(ev.xkey.state & ControlMask) {
  96                                 switch (ksym) {
  97                                 case XK_h:
  98                                 case XK_H: ksym = XK_BackSpace;
  99                                         break;
 100                                 case XK_u:
 101                                 case XK_U: passwd[0] = 0;
 102                                         continue;
 103                                 }
 104                         }
 105                         switch(ksym) {
 106                         case XK_Return:
 107 #if HAVE_SHADOW_H
 108                                 if((running = strncmp(crypt(passwd, sp->sp_pwdp), sp->sp_pwdp, sizeof(passwd))))
 109 #else
 110                                 if((running = strncmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd, sizeof(passwd))))
 111 #endif
 112                                         XBell(dpy, 100);
 113                                 passwd[0] = 0;
 114                                 break;
 115                         case XK_Escape:
 116                                 passwd[0] = 0;
 117                                 break;
 118                         case XK_BackSpace:
 119                                 if(len)
 120                                         passwd[--len] = 0;
 121                                 break;
 122                         default:
 123                                 if(num && !iscntrl((int) buf[0])) {
 124                                         buf[num] = 0;
 125                                         if(len)
 126                                                 strncat(passwd, buf, sizeof(passwd));
 127                                         else
 128                                                 strncpy(passwd, buf, sizeof(passwd));
 129                                 }
 130                                 break;
 131                         }
 132                 }
 133         XFreePixmap(dpy, pmap);
 134         XDestroyWindow(dpy, w);
 135         XCloseDisplay(dpy);
 136         return 0;
 137 }