/* cancel.c - LDAP cancel extended operation */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
 *
 * Copyright 1998-2004 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/krb.h>
#include <ac/socket.h>
#include <ac/string.h>
#include <ac/unistd.h>

#include "slap.h"

#include <lber_pvt.h>
#include <lutil.h>

int cancel_extop( Operation *op, SlapReply *rs )
{
	Operation *o;
	int rc;
	int found = 0;
	int opid;
	BerElement *ber;
	int i;

	assert( ber_bvcmp( &slap_EXOP_CANCEL, &op->ore_reqoid ) == 0 );

	if ( op->ore_reqdata == NULL ) {
		rs->sr_text = "no message ID supplied";
		return LDAP_PROTOCOL_ERROR;
	}

	ber = ber_init( op->ore_reqdata );
	if ( ber == NULL ) {
		rs->sr_text = "internal error";
		return LDAP_OTHER;
	}

	if ( ber_scanf( ber, "{i}", &opid ) == LBER_ERROR ) {
		rs->sr_text = "message ID parse failed";
		return LDAP_PROTOCOL_ERROR;
	}

	(void) ber_free( ber, 1 );

	if ( opid < 0 ) {
		rs->sr_text = "message ID invalid";
		return LDAP_PROTOCOL_ERROR;
	}

	ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
	LDAP_STAILQ_FOREACH( o, &op->o_conn->c_pending_ops, o_next ) {
		if ( o->o_msgid == opid ) {
			LDAP_STAILQ_REMOVE( &op->o_conn->c_pending_ops, o, slap_op, o_next );
			slap_op_free( o );
			found = 1;
			break;
		}
	}
	ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );

	if ( found ) return LDAP_SUCCESS;

	found = 0;
	ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
	LDAP_STAILQ_FOREACH( o, &op->o_conn->c_ops, o_next ) {
		if ( o->o_msgid == opid ) {
			found = 1;
			break;
		}
	}

	if ( !found ) {
		for ( i = 0; i < nbackends; i++ ) {
			op->o_bd = &backends[i];
			if( !op->o_bd->be_cancel ) continue;

			ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );

			op->oq_cancel.rs_msgid = opid;
			if ( op->o_bd->be_cancel( op, rs ) == LDAP_SUCCESS ) {
				return LDAP_SUCCESS;
			}
			ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
		}
		ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
		rs->sr_text = "message ID not found";
	 	return LDAP_NO_SUCH_OPERATION;
	}

	if ( op->o_cancel != SLAP_CANCEL_NONE ) {
		ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
		rs->sr_text = "message ID already being cancelled";
		return LDAP_PROTOCOL_ERROR;
	}

	op->o_cancel = SLAP_CANCEL_REQ;
	ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );

	while ( op->o_cancel == SLAP_CANCEL_REQ ) {
		ldap_pvt_thread_yield();
	}

	if ( op->o_cancel == SLAP_CANCEL_ACK ) {
		rc = LDAP_SUCCESS;
	} else {
		rc = op->o_cancel;
	}

	op->o_cancel = SLAP_CANCEL_DONE;

	return rc;
}