acl_get.c revision 75928 
1/*-
2 * Copyright (c) 1999, 2000, 2001 Robert N. M. Watson
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 * $FreeBSD: head/lib/libc/posix1e/acl_get.c 75928 2001-04-24 22:45:41Z jedgar $
27 */
28/*
29 * acl_get_file - syscall wrapper for retrieving ACL by filename
30 * acl_get_fd - syscall wrapper for retrieving access ACL by fd
31 * acl_get_fd_np - syscall wrapper for retrieving ACL by fd (non-POSIX)
32 * acl_get_perm_np() checks if a permission is in the specified
33 *                   permset (non-POSIX)
34 * acl_get_permset() returns the permission set in the ACL entry
35 * acl_get_qualifier() retrieves the qualifier of the tag from the ACL entry
36 * acl_get_tag_type() returns the tag type for the ACL entry entry_d
37 */
38
39#include <sys/types.h>
40#include "namespace.h"
41#include <sys/acl.h>
42#include "un-namespace.h"
43
44#include <errno.h>
45#include <stdlib.h>
46#include <string.h>
47
48acl_t
49acl_get_file(const char *path_p, acl_type_t type)
50{
51	acl_t	aclp;
52	int	error;
53
54	aclp = acl_init(ACL_MAX_ENTRIES);
55	if (!aclp) {
56		return (NULL);
57	}
58
59	error = __acl_get_file(path_p, type, &aclp->ats_acl);
60	if (error) {
61		acl_free(aclp);
62		return (NULL);
63	}
64
65	return (aclp);
66}
67
68acl_t
69acl_get_fd(int fd)
70{
71	acl_t	aclp;
72	int	error;
73
74	aclp = acl_init(ACL_MAX_ENTRIES);
75	if (!aclp) {
76		return (NULL);
77	}
78
79	error = ___acl_get_fd(fd, ACL_TYPE_ACCESS, &aclp->ats_acl);
80	if (error) {
81		acl_free(aclp);
82		return (NULL);
83	}
84
85	return (aclp);
86}
87
88acl_t
89acl_get_fd_np(int fd, acl_type_t type)
90{
91	acl_t	aclp;
92	int	error;
93
94	aclp = acl_init(ACL_MAX_ENTRIES);
95	if (!aclp) {
96		return (NULL);
97	}
98
99	error = ___acl_get_fd(fd, type, &aclp->ats_acl);
100	if (error) {
101		acl_free(aclp);
102		return (NULL);
103	}
104
105	return (aclp);
106}
107
108int
109acl_get_perm_np(acl_permset_t permset_d, acl_perm_t perm)
110{
111
112	if (!permset_d) {
113		errno = EINVAL;
114		return -1;
115	}
116
117	switch(perm) {
118	case ACL_READ:
119	case ACL_WRITE:
120	case ACL_EXECUTE:
121		if (*permset_d & perm)
122			return 1;
123		break;
124	default:
125		errno = EINVAL;
126		return -1;
127	}
128
129	return 0;
130}
131
132/*
133 * acl_get_permset() (23.4.17): return via permset_p a descriptor to
134 * the permission set in the ACL entry entry_d.
135 */
136int
137acl_get_permset(acl_entry_t entry_d, acl_permset_t *permset_p)
138{
139
140	if (!entry_d || !permset_p) {
141		errno = EINVAL;
142		return -1;
143	}
144
145	*permset_p = &entry_d->ae_perm;
146
147	return 0;
148}
149
150/*
151 * acl_get_qualifier() (23.4.18): retrieve the qualifier of the tag
152 * for the ACL entry entry_d.
153 */
154void *
155acl_get_qualifier(acl_entry_t entry_d)
156{
157	uid_t *retval;
158
159	if (!entry_d) {
160		errno = EINVAL;
161		return NULL;
162	}
163
164	switch(entry_d->ae_tag) {
165	case ACL_USER:
166	case ACL_GROUP:
167		retval = malloc(sizeof(uid_t));
168		if (!retval)
169			return NULL;
170		*retval = entry_d->ae_id;
171		return retval;
172	}
173
174	errno = EINVAL;
175	return NULL;
176}
177
178/*
179 * acl_get_tag_type() (23.4.19): return the tag type for the ACL
180 * entry entry_p.
181 */
182int
183acl_get_tag_type(acl_entry_t entry_d, acl_tag_t *tag_type_p)
184{
185
186	if (!entry_d || !tag_type_p) {
187		errno = EINVAL;
188		return -1;
189	}
190
191	*tag_type_p = entry_d->ae_tag;
192
193	return 0;
194}
195