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/*
File: __acl_from_xattr.c
Copyright (C) 1999, 2000
Andreas Gruenbacher, <andreas.gruenbacher@gmail.com>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "libacl.h"
#include "byteorder.h"
#include "acl_ea.h"
acl_t
__acl_from_xattr(const char *ext_acl_p, size_t size)
{
acl_ea_header *ext_header_p = (acl_ea_header *)ext_acl_p;
acl_ea_entry *ext_entry_p = (acl_ea_entry *)(ext_header_p+1);
acl_ea_entry *ext_end_p;
acl_obj *acl_obj_p;
acl_entry_obj *entry_obj_p;
int entries;
if (size < sizeof(acl_ea_header)) {
errno = EINVAL;
return NULL;
}
if (ext_header_p->a_version != cpu_to_le32(ACL_EA_VERSION)) {
errno = EINVAL;
return NULL;
}
size -= sizeof(acl_ea_header);
if (size % sizeof(acl_ea_entry)) {
errno = EINVAL;
return NULL;
}
entries = size / sizeof(acl_ea_entry);
ext_end_p = ext_entry_p + entries;
acl_obj_p = __acl_init_obj(entries);
if (acl_obj_p == NULL)
return NULL;
while (ext_end_p != ext_entry_p) {
entry_obj_p = __acl_create_entry_obj(acl_obj_p);
if (!entry_obj_p)
goto fail;
entry_obj_p->etag = le16_to_cpu(ext_entry_p->e_tag);
entry_obj_p->eperm.sperm = le16_to_cpu(ext_entry_p->e_perm);
switch(entry_obj_p->etag) {
case ACL_USER_OBJ:
case ACL_GROUP_OBJ:
case ACL_MASK:
case ACL_OTHER:
entry_obj_p->eid.qid = ACL_UNDEFINED_ID;
break;
case ACL_USER:
case ACL_GROUP:
entry_obj_p->eid.qid =
le32_to_cpu(ext_entry_p->e_id);
break;
default:
errno = EINVAL;
goto fail;
}
ext_entry_p++;
}
if (__acl_reorder_obj_p(acl_obj_p))
goto fail;
return int2ext(acl_obj_p);
fail:
__acl_free_acl_obj(acl_obj_p);
return NULL;
}
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