/* operational.c - mdb backend operational attributes function */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
 *
 * Copyright 2000-2017 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-mdb.h"

/*
 * sets *hasSubordinates to LDAP_COMPARE_TRUE/LDAP_COMPARE_FALSE
 * if the entry has children or not.
 */
int
mdb_hasSubordinates(
	Operation	*op,
	Entry		*e,
	int		*hasSubordinates )
{
	struct mdb_info *mdb = (struct mdb_info *) op->o_bd->be_private;
	MDB_txn		*rtxn;
	mdb_op_info	opinfo = {{{0}}}, *moi = &opinfo;
	int		rc;
	
	assert( e != NULL );

	rc = mdb_opinfo_get(op, mdb, 1, &moi);
	switch(rc) {
	case 0:
		break;
	default:
		rc = LDAP_OTHER;
		goto done;
	}

	rtxn = moi->moi_txn;

	rc = mdb_dn2id_children( op, rtxn, e );

	switch( rc ) {
	case 0:
		*hasSubordinates = LDAP_COMPARE_TRUE;
		break;

	case MDB_NOTFOUND:
		*hasSubordinates = LDAP_COMPARE_FALSE;
		rc = LDAP_SUCCESS;
		break;

	default:
		Debug(LDAP_DEBUG_ARGS, 
			"<=- " LDAP_XSTRING(mdb_hasSubordinates)
			": has_children failed: %s (%d)\n", 
			mdb_strerror(rc), rc, 0 );
		rc = LDAP_OTHER;
	}

done:;
	if ( moi == &opinfo ) {
		mdb_txn_reset( moi->moi_txn );
		LDAP_SLIST_REMOVE( &op->o_extra, &moi->moi_oe, OpExtra, oe_next );
	} else {
		moi->moi_ref--;
	}
	return rc;
}

/*
 * sets the supported operational attributes (if required)
 */
int
mdb_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 = mdb_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;
}