001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * https://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 * 019 */ 020package org.apache.directory.api.ldap.codec.actions; 021 022 023import org.apache.directory.api.asn1.DecoderException; 024import org.apache.directory.api.asn1.ber.grammar.GrammarAction; 025import org.apache.directory.api.asn1.ber.tlv.TLV; 026import org.apache.directory.api.i18n.I18n; 027import org.apache.directory.api.ldap.codec.api.LdapMessageContainer; 028import org.apache.directory.api.ldap.model.message.Message; 029import org.slf4j.Logger; 030import org.slf4j.LoggerFactory; 031 032 033/** 034 * The action used to check that the TLV length is not null 035 * 036 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 037 */ 038public class CheckLengthNotNull extends GrammarAction<LdapMessageContainer<Message>> 039{ 040 /** The logger */ 041 private static final Logger LOG = LoggerFactory.getLogger( CheckLengthNotNull.class ); 042 043 044 /** 045 * Instantiates the action. 046 */ 047 public CheckLengthNotNull() 048 { 049 super( "Check that the length is not null" ); 050 } 051 052 053 /** 054 * {@inheritDoc} 055 */ 056 public void action( LdapMessageContainer<Message> container ) throws DecoderException 057 { 058 TLV tlv = container.getCurrentTLV(); 059 int expectedLength = tlv.getLength(); 060 061 // The Length should be null 062 if ( expectedLength == 0 ) 063 { 064 String msg = I18n.err( I18n.ERR_08213_NULL_CONTROL_LENGTH ); 065 LOG.error( msg ); 066 067 // This will generate a PROTOCOL_ERROR 068 throw new DecoderException( msg ); 069 } 070 } 071}