/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
 *
 * Copyright 1999-2004 The OpenLDAP Foundation.
 * Portions Copyright 1999 Dmitry Kovalev.
 * 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>.
 */
/* ACKNOWLEDGEMENTS:
 * This work was initially developed by Dmitry Kovalev for inclusion
 * by OpenLDAP Software.
 */

#include "portable.h"

#ifdef SLAPD_SQL

#include <stdio.h>
#include <sys/types.h>

#include "slap.h"
#include "proto-sql.h"

int
backsql_compare( Operation *op, SlapReply *rs )
{
	backsql_info		*bi = (backsql_info*)op->o_bd->be_private;
	backsql_entryID		user_id = BACKSQL_ENTRYID_INIT;
	SQLHDBC			dbh;
	Entry			*e = NULL, user_entry;
	Attribute		*a = NULL, *a_op = NULL;
	backsql_srch_info	bsi;
	int			rc;
	AttributeName		anlist[2];
	struct berval		dn;

	user_entry.e_name.bv_val = NULL;
	user_entry.e_name.bv_len = 0;
	user_entry.e_nname.bv_val = NULL;
	user_entry.e_nname.bv_len = 0;
	user_entry.e_attrs = NULL;
 
 	Debug( LDAP_DEBUG_TRACE, "==>backsql_compare()\n", 0, 0, 0 );

	rs->sr_err = backsql_get_db_conn( op, &dbh );
	if (!dbh) {
     		Debug( LDAP_DEBUG_TRACE, "backsql_compare(): "
			"could not get connection handle - exiting\n",
			0, 0, 0 );

		rs->sr_text = ( rs->sr_err == LDAP_OTHER )
			? "SQL-backend error" : NULL;
		goto return_results;
	}

	dn = op->o_req_dn;
	if ( backsql_api_dn2odbc( op, rs, &dn ) ) {
		Debug( LDAP_DEBUG_TRACE, "backsql_search(): "
			"backsql_api_dn2odbc failed\n", 
			0, 0, 0 );
		rs->sr_err = LDAP_OTHER;
		rs->sr_text = "SQL-backend error";
		goto return_results;
	}

	rc = backsql_dn2id( bi, &user_id, dbh, &dn );
	if ( rc != LDAP_SUCCESS ) {
		Debug( LDAP_DEBUG_TRACE, "backsql_compare(): "
			"could not retrieve compare dn id - no such entry\n", 
			0, 0, 0 );
		rs->sr_err = LDAP_NO_SUCH_OBJECT;
		goto return_results;
	}

	anlist[0].an_name = op->oq_compare.rs_ava->aa_desc->ad_cname;
	anlist[0].an_desc = op->oq_compare.rs_ava->aa_desc;
	anlist[1].an_name.bv_val = NULL;

	/*
	 * Try to get attr as dynamic operational
	 */
	if ( is_at_operational( op->oq_compare.rs_ava->aa_desc->ad_type ) ) {
		AttributeName	*an_old;
		Entry		*e_old;

		user_entry.e_attrs = NULL;
		user_entry.e_name = op->o_req_dn;
		user_entry.e_nname = op->o_req_ndn;

		an_old = rs->sr_attrs;
		e_old = rs->sr_entry;

		rs->sr_attrs = anlist;
		rs->sr_entry = &user_entry;
		rs->sr_err = backsql_operational( op, rs, 0, &a_op );
		rs->sr_attrs = an_old;
		rs->sr_entry = e_old;

		if ( rs->sr_err != LDAP_SUCCESS ) {
			goto return_results;
		}
		
	}

	/*
	 * attr was dynamic operational
	 */
	if ( a_op != NULL ) {
		user_entry.e_attrs = a_op;
		e = &user_entry;

	} else {
		backsql_init_search( &bsi, &dn, LDAP_SCOPE_BASE, 
				-1, -1, -1, NULL, dbh, op, rs, anlist );
		e = backsql_id2entry( &bsi, &user_entry, &user_id );
		if ( e == NULL ) {
			Debug( LDAP_DEBUG_TRACE, "backsql_compare(): "
				"error in backsql_id2entry() "
				"- compare failed\n", 0, 0, 0 );
			rs->sr_err = LDAP_OTHER;
			goto return_results;
		}
	}

	if ( ! access_allowed( op, e, op->oq_compare.rs_ava->aa_desc, 
				&op->oq_compare.rs_ava->aa_value,
				ACL_COMPARE, NULL ) ) {
		rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
		goto return_results;
	}

	rs->sr_err = LDAP_NO_SUCH_ATTRIBUTE;
	for ( a = attrs_find( e->e_attrs, op->oq_compare.rs_ava->aa_desc );
			a != NULL;
			a = attrs_find( a->a_next, op->oq_compare.rs_ava->aa_desc ))
	{
		rs->sr_err = LDAP_COMPARE_FALSE;
		if ( value_find_ex( op->oq_compare.rs_ava->aa_desc,
					SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
					SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
					a->a_nvals,
					&op->oq_compare.rs_ava->aa_value,
					op->o_tmpmemctx ) == 0 )
		{
			rs->sr_err = LDAP_COMPARE_TRUE;
			break;
		}
	}

return_results:;
	send_ldap_result( op, rs );

	if ( dn.bv_val != op->o_req_dn.bv_val ) {
		ch_free( dn.bv_val );
	}

	if ( e != NULL ) {
		if ( e->e_name.bv_val != NULL ) {
			free( e->e_name.bv_val );
		}

		if ( e->e_nname.bv_val != NULL ) {
			free( e->e_nname.bv_val );
		}

		if ( e->e_attrs != NULL ) {
			attrs_free( e->e_attrs );
		}
	}

	Debug(LDAP_DEBUG_TRACE,"<==backsql_compare()\n",0,0,0);
	switch ( rs->sr_err ) {
	case LDAP_COMPARE_TRUE:
	case LDAP_COMPARE_FALSE:
		return 0;

	default:
		return 1;
	}
}
 
#endif /* SLAPD_SQL */