1 /* $OpenBSD: biff.c,v 1.19 2022/12/04 23:50:47 cheloha Exp $ */
2 /* $NetBSD: biff.c,v 1.3 1995/03/26 02:34:22 glass Exp $ */
3
4 /*
5 * Copyright (c) 1980, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #include <sys/types.h>
34 #include <sys/stat.h>
35
36 #include <err.h>
37 #include <errno.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <unistd.h>
42
43 static void usage(void);
44
45 int
main(int argc,char * argv[])46 main(int argc, char *argv[])
47 {
48 struct stat sb;
49 int ch;
50 char *name;
51
52 while ((ch = getopt(argc, argv, "")) != -1)
53 switch(ch) {
54 default:
55 usage();
56 }
57 argc -= optind;
58 argv += optind;
59
60 if ((name = ttyname(STDERR_FILENO)) == NULL)
61 err(2, "tty");
62
63 if (unveil(name, "rw") == -1)
64 err(2, "unveil %s", name);
65 if (pledge("stdio rpath fattr", NULL) == -1)
66 err(2, "pledge");
67
68 if (stat(name, &sb))
69 err(2, "stat");
70
71 sb.st_mode &= ACCESSPERMS;
72
73 if (*argv == NULL) {
74 (void)printf("is %s\n", sb.st_mode & S_IXUSR ? "y" : "n");
75 exit(sb.st_mode & S_IXUSR ? 0 : 1);
76 }
77
78 switch(argv[0][0]) {
79 case 'n':
80 if (chmod(name, sb.st_mode & ~S_IXUSR) == -1)
81 err(2, "%s", name);
82 break;
83 case 'y':
84 if (chmod(name, sb.st_mode | S_IXUSR) == -1)
85 err(2, "%s", name);
86 break;
87 default:
88 usage();
89 }
90 exit(sb.st_mode & S_IXUSR ? 0 : 1);
91 }
92
93 static void
usage(void)94 usage(void)
95 {
96 (void)fprintf(stderr, "usage: biff [n | y]\n");
97 exit(2);
98 }
99