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/cdefs.h>
28__FBSDID("$FreeBSD$");
29
30#include <sys/types.h>
31#include <sys/acl.h>
32#include <sys/stat.h>
33
34#include <err.h>
35
36#include "setfacl.h"
37
38/* set the appropriate mask the given ACL's */
39int
40set_acl_mask(acl_t *prev_acl, const char *filename)
41{
42	acl_entry_t entry;
43	acl_t acl;
44	acl_tag_t tag;
45	int entry_id;
46
47	entry = NULL;
48
49	/*
50	 * ... if a mask entry is specified, then the permissions of the mask
51	 * entry in the resulting ACL shall be set to the permissions in the
52	 * specified ACL mask entry.
53	 */
54	if (have_mask)
55		return (0);
56
57	acl = acl_dup(*prev_acl);
58	if (acl == NULL)
59		err(1, "%s: acl_dup() failed", filename);
60
61	if (!n_flag) {
62		/*
63		 * If no mask entry is specified and the -n option is not
64		 * specified, then the permissions of the resulting ACL mask
65		 * entry shall be set to the union of the permissions
66		 * associated with all entries which belong to the file group
67		 * class in the resulting ACL
68		 */
69		if (acl_calc_mask(&acl)) {
70			warn("%s: acl_calc_mask() failed", filename);
71			acl_free(acl);
72			return (-1);
73		}
74	} else {
75		/*
76		 * If no mask entry is specified and the -n option is
77		 * specified, then the permissions of the resulting ACL
78		 * mask entry shall remain unchanged ...
79		 */
80
81		entry_id = ACL_FIRST_ENTRY;
82
83		while (acl_get_entry(acl, entry_id, &entry) == 1) {
84			entry_id = ACL_NEXT_ENTRY;
85			if (acl_get_tag_type(entry, &tag) == -1)
86				err(1, "%s: acl_get_tag_type() failed",
87				    filename);
88
89			if (tag == ACL_MASK) {
90				acl_free(acl);
91				return (0);
92			}
93		}
94
95		/*
96		 * If no mask entry is specified, the -n option is specified,
97		 * and no ACL mask entry exists in the ACL associated with the
98		 * file, then write an error message to standard error and
99		 * continue with the next file.
100		 */
101		warnx("%s: warning: no mask entry", filename);
102		acl_free(acl);
103		return (0);
104	}
105
106	acl_free(*prev_acl);
107	*prev_acl = acl_dup(acl);
108	acl_free(acl);
109
110	return (0);
111}
112