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 * http://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.shared.kerberos.codec.actions; 021 022 023import org.apache.directory.api.asn1.DecoderException; 024import org.apache.directory.api.asn1.ber.Asn1Container; 025import org.apache.directory.api.asn1.ber.grammar.GrammarAction; 026import org.apache.directory.api.asn1.ber.tlv.BerValue; 027import org.apache.directory.api.asn1.ber.tlv.IntegerDecoder; 028import org.apache.directory.api.asn1.ber.tlv.IntegerDecoderException; 029import org.apache.directory.api.asn1.ber.tlv.TLV; 030import org.apache.directory.api.i18n.I18n; 031import org.slf4j.Logger; 032import org.slf4j.LoggerFactory; 033 034 035/** 036 * The action used to read the PVNO 037 * 038 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 039 */ 040public abstract class AbstractReadPvno<E extends Asn1Container> extends GrammarAction<E> 041{ 042 /** The logger */ 043 private static final Logger LOG = LoggerFactory.getLogger( AbstractReadPvno.class ); 044 045 /** Speedup for logs */ 046 private static final boolean IS_DEBUG = LOG.isDebugEnabled(); 047 048 049 /** 050 * Creates a new instance of AbstractReadPvno. 051 * 052 * @param name the name of the action 053 */ 054 public AbstractReadPvno( String name ) 055 { 056 super( name ); 057 } 058 059 060 /** 061 * sets the pvno on the ASN.1 object present in the container 062 * 063 * @param pvno the protocol version number received 064 * @param container the ASN.1 object's container 065 */ 066 protected abstract void setPvno( int pvno, E container ); 067 068 069 /** 070 * {@inheritDoc} 071 */ 072 public final void action( E container ) throws DecoderException 073 { 074 TLV tlv = container.getCurrentTLV(); 075 076 // The Length should not be null and should be 1 077 if ( tlv.getLength() != 1 ) 078 { 079 LOG.error( I18n.err( I18n.ERR_01308_ZERO_LENGTH_TLV ) ); 080 081 // This will generate a PROTOCOL_ERROR 082 throw new DecoderException( I18n.err( I18n.ERR_01309_EMPTY_TLV ) ); 083 } 084 085 BerValue value = tlv.getValue(); 086 087 try 088 { 089 int pvno = IntegerDecoder.parse( value ); 090 091 if ( pvno != 5 ) 092 { 093 LOG.error( I18n.err( I18n.ERR_01306_VALUE_NOT_IN_RANGE, 5, 5 ) ); 094 095 // This will generate a PROTOCOL_ERROR 096 throw new DecoderException( "The PVNO should be 5" ); 097 } 098 099 if ( IS_DEBUG ) 100 { 101 LOG.debug( "pvno : {}", pvno ); 102 } 103 104 setPvno( pvno, container ); 105 } 106 catch ( IntegerDecoderException ide ) 107 { 108 LOG.error( I18n.err( I18n.ERR_01306_VALUE_NOT_IN_RANGE, 5, 5 ) ); 109 110 // This will generate a PROTOCOL_ERROR 111 throw new DecoderException( ide.getMessage() ); 112 } 113 } 114}