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 "namespace.h"
32#include <sys/acl.h>
33#include "un-namespace.h"
34
35#include <errno.h>
36#include <stdlib.h>
37
38/*
39 * acl_create_entry() (23.4.7): create a new ACL entry in the ACL pointed
40 * to by acl_p.
41 */
42int
43acl_create_entry(acl_t *acl_p, acl_entry_t *entry_p)
44{
45	struct acl *acl_int;
46
47	if (acl_p == NULL) {
48		errno = EINVAL;
49		return (-1);
50	}
51
52	acl_int = &(*acl_p)->ats_acl;
53
54	/*
55	 * +1, because we are checking if there is space left for one more
56	 * entry.
57	 */
58	if (acl_int->acl_cnt + 1 >= ACL_MAX_ENTRIES) {
59		errno = EINVAL;
60		return (-1);
61	}
62
63	*entry_p = &acl_int->acl_entry[acl_int->acl_cnt++];
64
65	(**entry_p).ae_tag  = ACL_UNDEFINED_TAG;
66	(**entry_p).ae_id   = ACL_UNDEFINED_ID;
67	(**entry_p).ae_perm = ACL_PERM_NONE;
68	(**entry_p).ae_entry_type = 0;
69	(**entry_p).ae_flags = 0;
70
71	(*acl_p)->ats_cur_entry = 0;
72
73	return (0);
74}
75
76int
77acl_create_entry_np(acl_t *acl_p, acl_entry_t *entry_p, int offset)
78{
79	int i;
80	struct acl *acl_int;
81
82	if (acl_p == NULL) {
83		errno = EINVAL;
84		return (-1);
85	}
86
87	acl_int = &(*acl_p)->ats_acl;
88
89	if (acl_int->acl_cnt + 1 >= ACL_MAX_ENTRIES) {
90		errno = EINVAL;
91		return (-1);
92	}
93
94	if (offset < 0 || offset > acl_int->acl_cnt) {
95		errno = EINVAL;
96		return (-1);
97	}
98
99	/* Make room for the new entry. */
100	for (i = acl_int->acl_cnt; i > offset; i--)
101		acl_int->acl_entry[i] = acl_int->acl_entry[i - 1];
102
103	acl_int->acl_cnt++;
104
105	*entry_p = &acl_int->acl_entry[offset];
106
107	(**entry_p).ae_tag  = ACL_UNDEFINED_TAG;
108	(**entry_p).ae_id   = ACL_UNDEFINED_ID;
109	(**entry_p).ae_perm = ACL_PERM_NONE;
110	(**entry_p).ae_entry_type = 0;
111	(**entry_p).ae_flags= 0;
112
113	(*acl_p)->ats_cur_entry = 0;
114
115	return (0);
116}
117
118/*
119 * acl_get_entry() (23.4.14): returns an ACL entry from an ACL
120 * indicated by entry_id.
121 */
122int
123acl_get_entry(acl_t acl, int entry_id, acl_entry_t *entry_p)
124{
125	struct acl *acl_int;
126
127	if (acl == NULL) {
128		errno = EINVAL;
129		return (-1);
130	}
131	acl_int = &acl->ats_acl;
132
133	switch(entry_id) {
134	case ACL_FIRST_ENTRY:
135		acl->ats_cur_entry = 0;
136		/* PASSTHROUGH */
137	case ACL_NEXT_ENTRY:
138		if (acl->ats_cur_entry >= acl->ats_acl.acl_cnt)
139			return 0;
140		*entry_p = &acl_int->acl_entry[acl->ats_cur_entry++];
141		return (1);
142	}
143
144	errno = EINVAL;
145	return (-1);
146}
147