applied Salmi's patch
[slock.git] / 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 }