1/*
2  File: __acl_from_xattr.c
3
4  Copyright (C) 1999, 2000
5  Andreas Gruenbacher, <a.gruenbacher@computer.org>
6
7  This program is free software; you can redistribute it and/or
8  modify it under the terms of the GNU Library General Public
9  License as published by the Free Software Foundation; either
10  version 2 of the License, or (at your option) any later version.
11
12  This program is distributed in the hope that it will be useful,
13  but WITHOUT ANY WARRANTY; without even the implied warranty of
14  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  Library General Public License for more details.
16
17  You should have received a copy of the GNU Library General Public
18  License along with this library; if not, write to the Free Software
19  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20*/
21
22#include "libacl.h"
23
24#include "byteorder.h"
25#include "acl_ea.h"
26
27
28acl_t
29__acl_from_xattr(const char *ext_acl_p, size_t size)
30{
31	acl_ea_header *ext_header_p = (acl_ea_header *)ext_acl_p;
32	acl_ea_entry *ext_entry_p = (acl_ea_entry *)(ext_header_p+1);
33	acl_ea_entry *ext_end_p;
34	acl_obj *acl_obj_p;
35	acl_entry_obj *entry_obj_p;
36	int entries, error;
37
38	if (size < sizeof(acl_ea_header)) {
39		errno = EINVAL;
40		return NULL;
41	}
42	if (ext_header_p->a_version != cpu_to_le32(ACL_EA_VERSION)) {
43		errno = EINVAL;
44		return NULL;
45	}
46	size -= sizeof(acl_ea_header);
47	if (size % sizeof(acl_ea_entry)) {
48		errno = EINVAL;
49		return NULL;
50	}
51	entries = size / sizeof(acl_ea_entry);
52	ext_end_p = ext_entry_p + entries;
53
54	acl_obj_p = __acl_init_obj(entries);
55	if (acl_obj_p == NULL)
56		return NULL;
57	while (ext_end_p != ext_entry_p) {
58		entry_obj_p = __acl_create_entry_obj(acl_obj_p);
59		if (!entry_obj_p)
60			goto fail;
61
62		entry_obj_p->etag        = le16_to_cpu(ext_entry_p->e_tag);
63		entry_obj_p->eperm.sperm = le16_to_cpu(ext_entry_p->e_perm);
64
65		switch(entry_obj_p->etag) {
66			case ACL_USER_OBJ:
67			case ACL_GROUP_OBJ:
68			case ACL_MASK:
69			case ACL_OTHER:
70				entry_obj_p->eid.qid = ACL_UNDEFINED_ID;
71				break;
72
73			case ACL_USER:
74			case ACL_GROUP:
75				entry_obj_p->eid.qid =
76					le32_to_cpu(ext_entry_p->e_id);
77				break;
78
79			default:
80				error = EINVAL;
81				goto fail;
82		}
83		ext_entry_p++;
84	}
85	if (__acl_reorder_obj_p(acl_obj_p))
86		goto fail;
87	return int2ext(acl_obj_p);
88
89fail:
90	__acl_free_acl_obj(acl_obj_p);
91	return NULL;
92}
93
94