remove.c revision 196936 
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
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/bin/setfacl/remove.c 196936 2009-09-07 16:19:32Z trasz $");
29
30#include <sys/types.h>
31#include <sys/acl.h>
32#include <sys/stat.h>
33
34#include <err.h>
35#include <stdio.h>
36#include <string.h>
37
38#include "setfacl.h"
39
40/*
41 * remove ACL entries from an ACL
42 */
43int
44remove_acl(acl_t acl, acl_t *prev_acl, const char *filename)
45{
46	acl_entry_t	entry;
47	acl_t		acl_new;
48	acl_tag_t	tag;
49	int		carried_error, entry_id, acl_brand, prev_acl_brand;
50
51	carried_error = 0;
52
53	acl_get_brand_np(acl, &acl_brand);
54	acl_get_brand_np(*prev_acl, &prev_acl_brand);
55
56	if (acl_brand != prev_acl_brand) {
57		warnx("%s: branding mismatch; existing ACL is %s, "
58		    "entry to be removed is %s", filename,
59		    prev_acl_brand == ACL_BRAND_NFS4 ? "NFSv4" : "POSIX.1e",
60		    acl_brand == ACL_BRAND_NFS4 ? "NFSv4" : "POSIX.1e");
61		return (-1);
62	}
63
64	carried_error = 0;
65
66	acl_new = acl_dup(*prev_acl);
67	if (acl_new == NULL)
68		err(1, "%s: acl_dup() failed", filename);
69
70	tag = ACL_UNDEFINED_TAG;
71
72	/* find and delete the entry */
73	entry_id = ACL_FIRST_ENTRY;
74	while (acl_get_entry(acl, entry_id, &entry) == 1) {
75		entry_id = ACL_NEXT_ENTRY;
76		if (acl_get_tag_type(entry, &tag) == -1)
77			err(1, "%s: acl_get_tag_type() failed", filename);
78		if (tag == ACL_MASK)
79			have_mask++;
80		if (acl_delete_entry(acl_new, entry) == -1) {
81			carried_error++;
82			warnx("%s: cannot remove non-existent ACL entry",
83			    filename);
84		}
85	}
86
87	acl_free(*prev_acl);
88	*prev_acl = acl_new;
89
90	if (carried_error)
91		return (-1);
92
93	return (0);
94}
95
96int
97remove_by_number(uint entry_number, acl_t *prev_acl, const char *filename)
98{
99	acl_entry_t	entry;
100	acl_t		acl_new;
101	acl_tag_t	tag;
102	int		carried_error, entry_id;
103	uint		i;
104
105	carried_error = 0;
106
107	acl_new = acl_dup(*prev_acl);
108	if (acl_new == NULL)
109		err(1, "%s: acl_dup() failed", filename);
110
111	tag = ACL_UNDEFINED_TAG;
112
113	/*
114	 * Find out whether we're removing the mask entry,
115	 * to behave the same as the routine above.
116	 *
117	 * XXX: Is this loop actually needed?
118	 */
119	entry_id = ACL_FIRST_ENTRY;
120	i = 0;
121	while (acl_get_entry(acl_new, entry_id, &entry) == 1) {
122		entry_id = ACL_NEXT_ENTRY;
123		if (i != entry_number)
124			continue;
125		if (acl_get_tag_type(entry, &tag) == -1)
126			err(1, "%s: acl_get_tag_type() failed", filename);
127		if (tag == ACL_MASK)
128			have_mask++;
129	}
130
131	if (acl_delete_entry_np(acl_new, entry_number) == -1) {
132		carried_error++;
133		warn("%s: acl_delete_entry_np() failed", filename);
134	}
135
136	acl_free(*prev_acl);
137	*prev_acl = acl_new;
138
139	if (carried_error)
140		return (-1);
141
142	return (0);
143}
144
145/*
146 * remove default entries
147 */
148int
149remove_default(acl_t *prev_acl, const char *filename)
150{
151
152	acl_free(*prev_acl);
153	*prev_acl = acl_init(ACL_MAX_ENTRIES);
154	if (*prev_acl == NULL)
155		err(1, "%s: acl_init() failed", filename);
156
157	return (0);
158}
159
160/*
161 * remove extended entries
162 */
163void
164remove_ext(acl_t *prev_acl, const char *filename)
165{
166	acl_t acl_new;
167
168	acl_new = acl_strip_np(*prev_acl, !n_flag);
169	if (acl_new == NULL)
170		err(1, "%s: acl_strip_np() failed", filename);
171
172	acl_free(*prev_acl);
173	*prev_acl = acl_new;
174}
175