xref: /freebsd/lib/libc/posix1e/acl_init.c (revision edf8578117e8844e02c0121147f45e4609b30680)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
3  *
4  * Copyright (c) 1999, 2000, 2001 Robert N. M. Watson
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26  * SUCH DAMAGE.
27  */
28 /*
29  * acl_init -- return a fresh acl structure
30  * acl_dup -- duplicate an acl and return the new copy
31  */
32 
33 #include <sys/cdefs.h>
34 #include <sys/types.h>
35 #include "namespace.h"
36 #include <sys/acl.h>
37 #include "un-namespace.h"
38 #include <errno.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <assert.h>
42 
43 #include "acl_support.h"
44 
45 #ifndef CTASSERT
46 #define CTASSERT(x)		_CTASSERT(x, __LINE__)
47 #define _CTASSERT(x, y)		__CTASSERT(x, y)
48 #define __CTASSERT(x, y)	typedef char __assert_ ## y [(x) ? 1 : -1]
49 #endif
50 
51 CTASSERT(1 << _ACL_T_ALIGNMENT_BITS > sizeof(struct acl_t_struct));
52 
53 acl_t
54 acl_init(int count)
55 {
56 	int error;
57 	acl_t acl;
58 
59 	if (count > ACL_MAX_ENTRIES) {
60 		errno = ENOMEM;
61 		return (NULL);
62 	}
63 	if (count < 0) {
64 		errno = EINVAL;
65 		return (NULL);
66 	}
67 
68 	error = posix_memalign((void *)&acl, 1 << _ACL_T_ALIGNMENT_BITS,
69 	    sizeof(struct acl_t_struct));
70 	if (error) {
71 		errno = error;
72 		return (NULL);
73 	}
74 
75 	bzero(acl, sizeof(struct acl_t_struct));
76 	acl->ats_brand = ACL_BRAND_UNKNOWN;
77 	acl->ats_acl.acl_maxcnt = ACL_MAX_ENTRIES;
78 
79 	return (acl);
80 }
81 
82 acl_t
83 acl_dup(acl_t acl)
84 {
85 	acl_t	acl_new;
86 
87 	acl_new = acl_init(ACL_MAX_ENTRIES);
88 	if (acl_new != NULL) {
89 		*acl_new = *acl;
90 		acl->ats_cur_entry = 0;
91 		acl_new->ats_cur_entry = 0;
92 	}
93 
94 	return (acl_new);
95 }
96