1/*-
2 * Copyright (c) 2001-2002 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 CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/types.h>
28#include <sys/acl.h>
29#include <sys/stat.h>
30
31#include <err.h>
32
33#include "setfacl.h"
34
35/* set the appropriate mask the given ACL's */
36int
37set_acl_mask(acl_t *prev_acl, const char *filename)
38{
39	acl_entry_t entry;
40	acl_t acl;
41	acl_tag_t tag;
42	int entry_id;
43
44	entry = NULL;
45
46	/*
47	 * ... if a mask entry is specified, then the permissions of the mask
48	 * entry in the resulting ACL shall be set to the permissions in the
49	 * specified ACL mask entry.
50	 */
51	if (have_mask)
52		return (0);
53
54	acl = acl_dup(*prev_acl);
55	if (acl == NULL)
56		err(1, "%s: acl_dup() failed", filename);
57
58	if (!n_flag) {
59		/*
60		 * If no mask entry is specified and the -n option is not
61		 * specified, then the permissions of the resulting ACL mask
62		 * entry shall be set to the union of the permissions
63		 * associated with all entries which belong to the file group
64		 * class in the resulting ACL
65		 */
66		if (acl_calc_mask(&acl)) {
67			warn("%s: acl_calc_mask() failed", filename);
68			acl_free(acl);
69			return (-1);
70		}
71	} else {
72		/*
73		 * If no mask entry is specified and the -n option is
74		 * specified, then the permissions of the resulting ACL
75		 * mask entry shall remain unchanged ...
76		 */
77
78		entry_id = ACL_FIRST_ENTRY;
79
80		while (acl_get_entry(acl, entry_id, &entry) == 1) {
81			entry_id = ACL_NEXT_ENTRY;
82			if (acl_get_tag_type(entry, &tag) == -1)
83				err(1, "%s: acl_get_tag_type() failed",
84				    filename);
85
86			if (tag == ACL_MASK) {
87				acl_free(acl);
88				return (0);
89			}
90		}
91
92		/*
93		 * If no mask entry is specified, the -n option is specified,
94		 * and no ACL mask entry exists in the ACL associated with the
95		 * file, then write an error message to standard error and
96		 * continue with the next file.
97		 */
98		warnx("%s: warning: no mask entry", filename);
99		acl_free(acl);
100		return (0);
101	}
102
103	acl_free(*prev_acl);
104	*prev_acl = acl_dup(acl);
105	acl_free(acl);
106
107	return (0);
108}
109