1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
|
/* $OpenBSD: biff.c,v 1.17 2019/06/28 13:35:00 deraadt Exp $ */
/* $NetBSD: biff.c,v 1.3 1995/03/26 02:34:22 glass Exp $ */
/*
* Copyright (c) 1980, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
static void usage(void);
int
main(int argc, char *argv[])
{
struct stat sb;
int ch;
char *name;
while ((ch = getopt(argc, argv, "")) != -1)
switch(ch) {
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
if ((name = ttyname(STDERR_FILENO)) == NULL)
err(2, "tty");
if (unveil(name, "rw") == -1)
err(2, "unveil");
if (pledge("stdio rpath fattr", NULL) == -1)
err(2, "pledge");
if (stat(name, &sb))
err(2, "stat");
sb.st_mode &= ACCESSPERMS;
if (*argv == NULL) {
(void)printf("is %s\n", sb.st_mode & S_IXUSR ? "y" : "n");
exit(sb.st_mode & S_IXUSR ? 0 : 1);
}
switch(argv[0][0]) {
case 'n':
if (chmod(name, sb.st_mode & ~S_IXUSR) == -1)
err(2, "%s", name);
break;
case 'y':
if (chmod(name, sb.st_mode | S_IXUSR) == -1)
err(2, "%s", name);
break;
default:
usage();
}
exit(sb.st_mode & S_IXUSR ? 0 : 1);
}
static void
usage(void)
{
(void)fprintf(stderr, "usage: biff [n | y]\n");
exit(2);
}
|
