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/*
ldb database library
Copyright (C) Andrew Tridgell 2004
** NOTE! The following LGPL license applies to the ldb
** library. This does NOT imply that all of Samba is released
** under the LGPL
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 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, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Name: ldb
*
* Component: ldb tdb cache functions
*
* Description: cache special records in a ldb/tdb
*
* Author: Andrew Tridgell
*/
#include "includes.h"
#include "ldb/ldb_tdb/ldb_tdb.h"
/*
initialise the baseinfo record
*/
static int ltdb_baseinfo_init(struct ldb_context *ldb)
{
struct ltdb_private *ltdb = ldb->private_data;
struct ldb_message msg;
struct ldb_message_element el;
struct ldb_val val;
ltdb->sequence_number = 0;
msg.num_elements = 1;
msg.elements = ⪙
msg.dn = LTDB_BASEINFO;
el.name = LTDB_SEQUENCE_NUMBER;
el.values = &val;
el.num_values = 1;
el.flags = 0;
val.data = "0";
val.length = 1;
return ltdb_store(ldb, &msg, TDB_INSERT);
}
/*
free any cache records
*/
void ltdb_cache_free(struct ldb_context *ldb)
{
struct ltdb_private *ltdb = ldb->private_data;
ltdb->sequence_number = 0;
ltdb_search_dn1_free(ldb, <db->cache.baseinfo);
ltdb_search_dn1_free(ldb, <db->cache.indexlist);
ltdb_search_dn1_free(ldb, <db->cache.subclasses);
ltdb_search_dn1_free(ldb, <db->cache.attributes);
if (ltdb->cache.last_attribute.name) free(ltdb->cache.last_attribute.name);
memset(<db->cache, 0, sizeof(ltdb->cache));
}
/*
load the cache records
*/
int ltdb_cache_load(struct ldb_context *ldb)
{
struct ltdb_private *ltdb = ldb->private_data;
double seq;
ltdb_search_dn1_free(ldb, <db->cache.baseinfo);
if (ltdb_search_dn1(ldb, LTDB_BASEINFO, <db->cache.baseinfo) == -1) {
return -1;
}
/* possibly initialise the baseinfo */
if (!ltdb->cache.baseinfo.dn) {
if (ltdb_baseinfo_init(ldb) != 0) {
return -1;
}
if (ltdb_search_dn1(ldb, LTDB_BASEINFO, <db->cache.baseinfo) != 1) {
return -1;
}
}
/* if the current internal sequence number is the same as the one
in the database then assume the rest of the cache is OK */
seq = ldb_msg_find_double(<db->cache.baseinfo, LTDB_SEQUENCE_NUMBER, 0);
if (seq == ltdb->sequence_number) {
return 0;
}
ltdb->sequence_number = seq;
if (ltdb->cache.last_attribute.name) free(ltdb->cache.last_attribute.name);
memset(<db->cache.last_attribute, 0, sizeof(ltdb->cache.last_attribute));
ltdb_search_dn1_free(ldb, <db->cache.indexlist);
ltdb_search_dn1_free(ldb, <db->cache.subclasses);
ltdb_search_dn1_free(ldb, <db->cache.attributes);
if (ltdb_search_dn1(ldb, LTDB_INDEXLIST, <db->cache.indexlist) == -1) {
return -1;
}
if (ltdb_search_dn1(ldb, LTDB_SUBCLASSES, <db->cache.subclasses) == -1) {
return -1;
}
if (ltdb_search_dn1(ldb, LTDB_ATTRIBUTES, <db->cache.attributes) == -1) {
return -1;
}
return 0;
}
/*
increase the sequence number to indicate a database change
*/
int ltdb_increase_sequence_number(struct ldb_context *ldb)
{
struct ltdb_private *ltdb = ldb->private_data;
struct ldb_message msg;
struct ldb_message_element el;
struct ldb_val val;
char *s = NULL;
int ret;
asprintf(&s, "%.0f", ltdb->sequence_number+1);
if (!s) {
errno = ENOMEM;
return -1;
}
msg.num_elements = 1;
msg.elements = ⪙
msg.dn = LTDB_BASEINFO;
el.name = LTDB_SEQUENCE_NUMBER;
el.values = &val;
el.num_values = 1;
el.flags = LDB_FLAG_MOD_REPLACE;
val.data = s;
val.length = strlen(s);
ret = ltdb_modify_internal(ldb, &msg);
free(s);
if (ret == 0) {
ltdb->sequence_number += 1;
}
return ret;
}
/*
return the attribute flags from the @ATTRIBUTES record
for the given attribute
*/
int ltdb_attribute_flags(struct ldb_context *ldb, const char *attr_name)
{
struct ltdb_private *ltdb = ldb->private_data;
const char *attrs;
const struct {
const char *name;
int value;
} names[] = {
{ "CASE_INSENSITIVE", LTDB_FLAG_CASE_INSENSITIVE },
{ "INTEGER", LTDB_FLAG_INTEGER },
{ "WILDCARD", LTDB_FLAG_WILDCARD },
{ NULL, 0}
};
size_t len;
int i, ret=0;
if (ltdb->cache.last_attribute.name &&
ldb_attr_cmp(ltdb->cache.last_attribute.name, attr_name) == 0) {
return ltdb->cache.last_attribute.flags;
}
/* objectclass is a special default case */
if (ldb_attr_cmp(attr_name, LTDB_OBJECTCLASS) == 0) {
ret = LTDB_FLAG_OBJECTCLASS | LTDB_FLAG_CASE_INSENSITIVE;
}
attrs = ldb_msg_find_string(<db->cache.attributes, attr_name, NULL);
if (!attrs) {
return ret;
}
/* we avoid using strtok and friends due to their nasty
interface. This is a little trickier, but much nicer
from a C interface point of view */
while ((len = strcspn(attrs, " ,")) > 0) {
for (i=0;names[i].name;i++) {
if (strncmp(names[i].name, attrs, len) == 0 &&
names[i].name[len] == 0) {
ret |= names[i].value;
}
}
attrs += len;
attrs += strspn(attrs, " ,");
}
if (ltdb->cache.last_attribute.name) free(ltdb->cache.last_attribute.name);
ltdb->cache.last_attribute.name = strdup(attr_name);
ltdb->cache.last_attribute.flags = ret;
return ret;
}
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