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/* operational.c - bdb backend operational attributes function */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
* Copyright 2000-2021 The OpenLDAP Foundation.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted only as authorized by the OpenLDAP
* Public License.
*
* A copy of this license is available in the file LICENSE in the
* top-level directory of the distribution or, alternatively, at
* <http://www.OpenLDAP.org/license.html>.
*/
#include "portable.h"
#include <stdio.h>
#include <ac/string.h>
#include <ac/socket.h>
#include "slap.h"
#include "back-bdb.h"
/*
* sets *hasSubordinates to LDAP_COMPARE_TRUE/LDAP_COMPARE_FALSE
* if the entry has children or not.
*/
int
bdb_hasSubordinates(
Operation *op,
Entry *e,
int *hasSubordinates )
{
struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
struct bdb_op_info *opinfo;
OpExtra *oex;
DB_TXN *rtxn;
int rc;
int release = 0;
assert( e != NULL );
/* NOTE: this should never happen, but it actually happens
* when using back-relay; until we find a better way to
* preserve entry's private information while rewriting it,
* let's disable the hasSubordinate feature for back-relay.
*/
if ( BEI( e ) == NULL ) {
Entry *ee = NULL;
rc = be_entry_get_rw( op, &e->e_nname, NULL, NULL, 0, &ee );
if ( rc != LDAP_SUCCESS || ee == NULL ) {
rc = LDAP_OTHER;
goto done;
}
e = ee;
release = 1;
if ( BEI( ee ) == NULL ) {
rc = LDAP_OTHER;
goto done;
}
}
/* Check for a txn in a parent op, otherwise use reader txn */
LDAP_SLIST_FOREACH( oex, &op->o_extra, oe_next ) {
if ( oex->oe_key == bdb )
break;
}
opinfo = (struct bdb_op_info *) oex;
if ( opinfo && opinfo->boi_txn ) {
rtxn = opinfo->boi_txn;
} else {
rc = bdb_reader_get(op, bdb->bi_dbenv, &rtxn);
if ( rc ) {
rc = LDAP_OTHER;
goto done;
}
}
retry:
/* FIXME: we can no longer assume the entry's e_private
* field is correctly populated; so we need to reacquire
* it with reader lock */
rc = bdb_cache_children( op, rtxn, e );
switch( rc ) {
case DB_LOCK_DEADLOCK:
case DB_LOCK_NOTGRANTED:
goto retry;
case 0:
*hasSubordinates = LDAP_COMPARE_TRUE;
break;
case DB_NOTFOUND:
*hasSubordinates = LDAP_COMPARE_FALSE;
rc = LDAP_SUCCESS;
break;
default:
Debug(LDAP_DEBUG_ARGS,
"<=- " LDAP_XSTRING(bdb_hasSubordinates)
": has_children failed: %s (%d)\n",
db_strerror(rc), rc, 0 );
rc = LDAP_OTHER;
}
done:;
if ( release && e != NULL ) be_entry_release_r( op, e );
return rc;
}
/*
* sets the supported operational attributes (if required)
*/
int
bdb_operational(
Operation *op,
SlapReply *rs )
{
Attribute **ap;
assert( rs->sr_entry != NULL );
for ( ap = &rs->sr_operational_attrs; *ap; ap = &(*ap)->a_next ) {
if ( (*ap)->a_desc == slap_schema.si_ad_hasSubordinates ) {
break;
}
}
if ( *ap == NULL &&
attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_hasSubordinates ) == NULL &&
( SLAP_OPATTRS( rs->sr_attr_flags ) ||
ad_inlist( slap_schema.si_ad_hasSubordinates, rs->sr_attrs ) ) )
{
int hasSubordinates, rc;
rc = bdb_hasSubordinates( op, rs->sr_entry, &hasSubordinates );
if ( rc == LDAP_SUCCESS ) {
*ap = slap_operational_hasSubordinate( hasSubordinates == LDAP_COMPARE_TRUE );
assert( *ap != NULL );
ap = &(*ap)->a_next;
}
}
return LDAP_SUCCESS;
}
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