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/*
Copyright (c) 2011 Gluster, Inc. <http://www.gluster.com>
This file is part of GlusterFS.
GlusterFS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 3 of the License,
or (at your option) any later version.
GlusterFS 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see
<http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include "posix-acl.h"
#include "posix-acl-xattr.h"
int
posix_ace_cmp (const void *val1, const void *val2)
{
const struct posix_ace *ace1 = NULL;
const struct posix_ace *ace2 = NULL;
int ret = 0;
ace1 = val1;
ace2 = val2;
ret = (ace1->tag - ace2->tag);
if (!ret)
ret = (ace1->id - ace2->id);
return ret;
}
void
posix_acl_normalize (xlator_t *this, struct posix_acl *acl)
{
qsort (acl->entries, acl->count, sizeof (struct posix_ace *),
posix_ace_cmp);
}
struct posix_acl *
posix_acl_from_xattr (xlator_t *this, const char *xattr_buf, int xattr_size)
{
struct posix_acl_xattr_header *header = NULL;
struct posix_acl_xattr_entry *entry = NULL;
struct posix_acl *acl = NULL;
struct posix_ace *ace = NULL;
int size = 0;
int count = 0;
int i = 0;
size = xattr_size;
if (size < sizeof (*header))
return NULL;
size -= sizeof (*header);
if (size % sizeof (*entry))
return NULL;
count = size / sizeof (*entry);
header = (struct posix_acl_xattr_header *) (xattr_buf);
entry = (struct posix_acl_xattr_entry *) (header + 1);
if (header->version != htole32 (POSIX_ACL_VERSION))
return NULL;
acl = posix_acl_new (this, count);
if (!acl)
return NULL;
ace = acl->entries;
for (i = 0; i < count; i++) {
ace->tag = letoh16 (entry->tag);
ace->perm = letoh16 (entry->perm);
switch (ace->tag) {
case POSIX_ACL_USER_OBJ:
case POSIX_ACL_MASK:
case POSIX_ACL_OTHER:
ace->id = POSIX_ACL_UNDEFINED_ID;
break;
case POSIX_ACL_GROUP:
case POSIX_ACL_USER:
case POSIX_ACL_GROUP_OBJ:
ace->id = letoh32 (entry->id);
break;
default:
goto err;
}
ace++;
entry++;
}
posix_acl_normalize (this, acl);
return acl;
err:
posix_acl_destroy (this, acl);
return NULL;
}
int
posix_acl_to_xattr (xlator_t *this, struct posix_acl *acl, char *xattr_buf,
int xattr_size)
{
int size = 0;
struct posix_acl_xattr_header *header = NULL;
struct posix_acl_xattr_entry *entry = NULL;
struct posix_ace *ace = NULL;
int i = 0;
size = sizeof (*header) + (acl->count * sizeof (*entry));
if (xattr_size < size)
return size;
header = (struct posix_acl_xattr_header *) (xattr_buf);
entry = (struct posix_acl_xattr_entry *) (header + 1);
ace = acl->entries;
header->version = htole32 (POSIX_ACL_VERSION);
for (i = 0; i < acl->count; i++) {
entry->tag = htole16 (ace->tag);
entry->perm = htole16 (ace->perm);
switch (ace->tag) {
case POSIX_ACL_USER:
case POSIX_ACL_GROUP:
entry->id = htole32 (ace->id);
break;
default:
entry->id = POSIX_ACL_UNDEFINED_ID;
break;
}
ace++;
entry++;
}
return 0;
}
int
posix_acl_matches_xattr (xlator_t *this, struct posix_acl *acl, const char *buf,
int size)
{
struct posix_acl *acl2 = NULL;
int ret = 1;
acl2 = posix_acl_from_xattr (this, buf, size);
if (!acl2)
return 0;
if (acl->count != acl2->count) {
ret = 0;
goto out;
}
if (memcmp (acl->entries, acl2->entries,
(acl->count * sizeof (struct posix_ace))))
ret = 0;
out:
posix_acl_destroy (this, acl2);
return ret;
}
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