mask.c revision 90127 
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 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 90127 2002-02-03 02:37:43Z jedgar $
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
38#include "setfacl.h"
39
40/* set the appropriate mask the given ACL's */
41int
42set_acl_mask(acl_t *prev_acl)
43{
44	acl_entry_t entry, entry_new;
45	acl_t acl;
46	acl_tag_t tag;
47	int entry_id;
48
49	entry = NULL;
50
51	/*
52	 * ... if a mask entry is specified, then the permissions of the mask
53	 * entry in the resulting ACL shall be set to the permissions in the
54	 * specified ACL mask entry.
55	 */
56	if (have_mask)
57		return (0);
58
59	acl = acl_dup(*prev_acl);
60	if (acl == NULL)
61		err(1, "acl_dup() failed");
62
63	if (n_flag == 0) {
64		/*
65		 * If no mask entry is specified and the -n option is not
66		 * specified, then the permissions of the resulting ACL mask
67		 * entry shall be set to the union of the permissions
68		 * associated with all entries which belong to the file group
69		 * class in the resulting ACL
70		 */
71		if (acl_calc_mask(&acl)) {
72			warn("acl_calc_mask() failed");
73			acl_free(acl);
74			return (-1);
75		}
76	} else {
77		/*
78		 * If no mask entry is specified and the -n option is
79		 * specified, then the permissions of the resulting ACL
80		 * mask entry shall remain unchanged ...
81		 */
82
83		entry_id = ACL_FIRST_ENTRY;
84
85		while (acl_get_entry(acl, entry_id, &entry) == 1) {
86			entry_id = ACL_NEXT_ENTRY;
87			if (acl_get_tag_type(entry, &tag) == -1)
88				err(1, "acl_get_tag_type() failed");
89
90			if (tag == ACL_MASK) {
91				acl_free(acl);
92				return (0);
93			}
94		}
95
96		/*
97		 * If no mask entry is specified, the -n option is specified,
98		 * and no ACL mask entry exists in the ACL associated with the
99		 * file, then write an error message to standard error and
100		 * continue with the next file.
101		 */
102		warnx("warning: no mask entry");
103		acl_free(acl);
104		return (0);
105	}
106
107	acl_free(*prev_acl);
108	*prev_acl = acl_init(ACL_MAX_ENTRIES);
109	if (*prev_acl == NULL)
110		err(1, "acl_init() failed");
111
112	entry_id = ACL_FIRST_ENTRY;
113	while (acl_get_entry(acl, entry_id, &entry) == 1) {
114		entry_id = ACL_NEXT_ENTRY;
115		if (acl_create_entry(prev_acl, &entry_new) == -1)
116			err(1, "acl_create_entry() failed");
117		if (acl_copy_entry(entry_new, entry) == -1)
118			err(1, "acl_copy_entry() failed");
119	}
120
121	acl_free(acl);
122
123	return (0);
124}
125