mask.c revision 74465 
1/*
2 * Copyright (c) 2001 Chris D. Faulhaber
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR THE VOICES IN HIS HEAD BE
18 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
19 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
20 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
21 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
22 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
23 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
24 * POSSIBILITY OF SUCH DAMAGE.
25 *
26 * $FreeBSD: head/bin/setfacl/mask.c 74465 2001-03-19 18:09:25Z rwatson $
27 */
28
29#include <sys/types.h>
30#include <sys/acl.h>
31#include <sys/stat.h>
32
33#include <err.h>
34#include <errno.h>
35#include <stdio.h>
36#include <stdlib.h>
37#include <sysexits.h>
38
39#include "setfacl.h"
40
41/* set the appropriate mask the given ACL's */
42int
43set_acl_mask(acl_t prev_acl)
44{
45	acl_t acl;
46	int i;
47
48	/*
49	 * ... if a mask entry is specified, then the permissions of the mask
50	 * entry in the resulting ACL shall be set to the permissions in the
51	 * specified ACL mask entry.
52	 */
53	if (have_mask)
54		return 0;
55
56	acl = acl_dup(prev_acl);
57	if (!acl)
58		err(EX_OSERR, "acl_dup() failed");
59
60	if (!n_flag) {
61		/*
62		 * If no mask entry is specified and the -n option is not
63		 * specified, then the permissions of the resulting ACL mask
64		 * entry shall be set to the union of the permissions
65		 * associated with all entries which belong to the file group
66		 * class in the resulting ACL
67		 */
68		if (acl_calc_mask(&acl)) {
69			warn("acl_calc_mask() failed");
70			acl_free(acl);
71			return -1;
72		}
73	} else {
74		/*
75		 * If no mask entry is specified and the -n option is
76		 * specified, then the permissions of the resulting ACL
77		 * mask entry shall remain unchanged ...
78		 */
79		for (i = 0; i < acl->acl_cnt; i++)
80			if (acl->acl_entry[i].ae_tag == ACL_MASK) {
81				acl_free(acl);
82				return 0;
83			}
84
85		/*
86		 * If no mask entry is specified, the -n option is specified,
87		 * and no ACL mask entry exists in the ACL associated with the
88		 * file, then write an error message to standard error and
89		 * continue with the next file.
90		 */
91		warnx("warning: no mask entry");
92		acl_free(acl);
93		return 0;
94	}
95
96	*prev_acl = *acl;
97	acl_free(acl);
98
99	return 0;
100}
101