git.sur5r.net Git - i3/i3lock/blob - i3lock.c

   1 /* See LICENSE file for license details. */
   2 #define _XOPEN_SOURCE 500
   3 #if HAVE_SHADOW_H
   4 #include <shadow.h>
   5 #endif
   6
   7 #include <ctype.h>
   8 #include <pwd.h>
   9 #include <stdarg.h>
  10 #include <stdlib.h>
  11 #include <stdio.h>
  12 #include <string.h>
  13 #include <unistd.h>
  14 #include <sys/types.h>
  15 #include <X11/keysym.h>
  16 #include <X11/Xlib.h>
  17 #include <X11/Xutil.h>
  18
  19 #if HAVE_BSD_AUTH
  20 #include <login_cap.h>
  21 #include <bsd_auth.h>
  22 #endif
  23
  24 static void
  25 die(const char *errstr, ...) {
  26         va_list ap;
  27
  28         va_start(ap, errstr);
  29         vfprintf(stderr, errstr, ap);
  30         va_end(ap);
  31         exit(EXIT_FAILURE);
  32 }
  33
  34 #ifndef HAVE_BSD_AUTH
  35 static const char *
  36 get_password() { /* only run as root */
  37         const char *rval;
  38         struct passwd *pw;
  39
  40         if(geteuid() != 0)
  41                 die("slock: cannot retrieve password entry (make sure to suid slock)\n");
  42         pw = getpwuid(getuid());
  43         endpwent();
  44         rval =  pw->pw_passwd;
  45
  46 #if HAVE_SHADOW_H
  47         {
  48                 struct spwd *sp;
  49                 sp = getspnam(getenv("USER"));
  50                 endspent();
  51                 rval = sp->sp_pwdp;
  52         }
  53 #endif
  54
  55         /* drop privileges */
  56         if(setgid(pw->pw_gid) < 0 || setuid(pw->pw_uid) < 0)
  57                 die("slock: cannot drop privileges\n");
  58         return rval;
  59 }
  60 #endif
  61
  62 int
  63 main(int argc, char **argv) {
  64         char curs[] = {0, 0, 0, 0, 0, 0, 0, 0};
  65         char buf[32], passwd[256];
  66         int num, screen;
  67
  68 #ifndef HAVE_BSD_AUTH
  69         const char *pws;
  70 #endif
  71         unsigned int len;
  72         Bool running = True;
  73         Cursor invisible;
  74         Display *dpy;
  75         KeySym ksym;
  76         Pixmap pmap;
  77         Window root, w;
  78         XColor black, dummy;
  79         XEvent ev;
  80         XSetWindowAttributes wa;
  81
  82         if((argc == 2) && !strcmp("-v", argv[1]))
  83                 die("i3lock-"VERSION", © 2009 Michael Stapelberg\n"
  84                     "based on slock, which is © 2006-2008 Anselm R Garbe\n");
  85         else if(argc != 1)
  86                 die("usage: slock [-v]\n");
  87
  88 #ifndef HAVE_BSD_AUTH
  89         pws = get_password();
  90 #endif
  91
  92         if(!(dpy = XOpenDisplay(0)))
  93                 die("slock: cannot open display\n");
  94         screen = DefaultScreen(dpy);
  95         root = RootWindow(dpy, screen);
  96
  97         if (fork() != 0)
  98                 return 0;
  99
 100         /* init */
 101         wa.override_redirect = 1;
 102         wa.background_pixel = WhitePixel(dpy, screen);
 103         w = XCreateWindow(dpy, root, 0, 0, DisplayWidth(dpy, screen), DisplayHeight(dpy, screen),
 104                         0, DefaultDepth(dpy, screen), CopyFromParent,
 105                         DefaultVisual(dpy, screen), CWOverrideRedirect | CWBackPixel, &wa);
 106         XAllocNamedColor(dpy, DefaultColormap(dpy, screen), "black", &black, &dummy);
 107         pmap = XCreateBitmapFromData(dpy, w, curs, 8, 8);
 108         invisible = XCreatePixmapCursor(dpy, pmap, pmap, &black, &black, 0, 0);
 109         XDefineCursor(dpy, w, invisible);
 110         XMapRaised(dpy, w);
 111         for(len = 1000; len; len--) {
 112                 if(XGrabPointer(dpy, root, False, ButtonPressMask | ButtonReleaseMask | PointerMotionMask,
 113                         GrabModeAsync, GrabModeAsync, None, invisible, CurrentTime) == GrabSuccess)
 114                         break;
 115                 usleep(1000);
 116         }
 117         if((running = running && (len > 0))) {
 118                 for(len = 1000; len; len--) {
 119                         if(XGrabKeyboard(dpy, root, True, GrabModeAsync, GrabModeAsync, CurrentTime)
 120                                 == GrabSuccess)
 121                                 break;
 122                         usleep(1000);
 123                 }
 124                 running = (len > 0);
 125         }
 126         len = 0;
 127         XSync(dpy, False);
 128
 129         /* main event loop */
 130         while(running && !XNextEvent(dpy, &ev)) {
 131                 if(ev.type == KeyPress) {
 132                         buf[0] = 0;
 133                         num = XLookupString(&ev.xkey, buf, sizeof buf, &ksym, 0);
 134                         if(IsKeypadKey(ksym)) {
 135                                 if(ksym == XK_KP_Enter)
 136                                         ksym = XK_Return;
 137                                 else if(ksym >= XK_KP_0 && ksym <= XK_KP_9)
 138                                         ksym = (ksym - XK_KP_0) + XK_0;
 139                         }
 140                         if(IsFunctionKey(ksym) || IsKeypadKey(ksym)
 141                                         || IsMiscFunctionKey(ksym) || IsPFKey(ksym)
 142                                         || IsPrivateKeypadKey(ksym))
 143                                 continue;
 144                         switch(ksym) {
 145                         case XK_Return:
 146                                 passwd[len] = 0;
 147 #ifdef HAVE_BSD_AUTH
 148                                 running = !auth_userokay(getlogin(), NULL, "auth-xlock", passwd);
 149 #else
 150                                 running = strcmp(crypt(passwd, pws), pws);
 151 #endif
 152                                 len = 0;
 153                                 break;
 154                         case XK_Escape:
 155                                 len = 0;
 156                                 break;
 157                         case XK_BackSpace:
 158                                 if(len)
 159                                         --len;
 160                                 break;
 161                         default:
 162                                 if(num && !iscntrl((int) buf[0]) && (len + num < sizeof passwd)) {
 163                                         memcpy(passwd + len, buf, num);
 164                                         len += num;
 165                                 }
 166                                 break;
 167                         }
 168                 }
 169         }
 170         XUngrabPointer(dpy, CurrentTime);
 171         XFreePixmap(dpy, pmap);
 172         XDestroyWindow(dpy, w);
 173         XCloseDisplay(dpy);
 174         return 0;
 175 }