1/*
2  File: acl_get_file.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 <sys/types.h>
23#include <sys/stat.h>
24#include <unistd.h>
25#include <stdio.h>
26#include "../../attr/include/xattr.h"
27#include <acl/libacl.h>
28#include "libacl.h"
29#include "__acl_from_xattr.h"
30
31#include "byteorder.h"
32#include "acl_ea.h"
33
34
35/* 23.4.16 */
36acl_t
37acl_get_file(const char *path_p, acl_type_t type)
38{
39	const size_t size_guess = acl_ea_size(16);
40	char *ext_acl_p = alloca(size_guess);
41	const char *name;
42	int retval;
43
44	switch(type) {
45		case ACL_TYPE_ACCESS:
46			name = ACL_EA_ACCESS;
47			break;
48		case ACL_TYPE_DEFAULT:
49			name = ACL_EA_DEFAULT;
50			break;
51		default:
52			errno = EINVAL;
53			return NULL;
54	}
55
56	if (!ext_acl_p)
57		return NULL;
58	retval = getxattr(path_p, name, ext_acl_p, size_guess);
59	if (retval == -1 && errno == ERANGE) {
60		retval = getxattr(path_p, name, NULL, 0);
61		if (retval > 0) {
62			ext_acl_p = alloca(retval);
63			if (!ext_acl_p)
64				return NULL;
65			retval = getxattr(path_p, name, ext_acl_p, retval);
66		}
67	}
68	if (retval > 0) {
69		acl_t acl = __acl_from_xattr(ext_acl_p, retval);
70		return acl;
71	} else if (retval == 0 || errno == ENOATTR || errno == ENODATA) {
72		struct stat st;
73
74		if (stat(path_p, &st) != 0)
75			return NULL;
76
77		if (type == ACL_TYPE_DEFAULT) {
78			if (S_ISDIR(st.st_mode))
79				return acl_init(0);
80			else {
81				errno = EACCES;
82				return NULL;
83			}
84		} else
85			return acl_from_mode(st.st_mode);
86	} else
87		return NULL;
88}
89
90