| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| */ |
| package org.apache.directory.shared.kerberos.codec.actions; |
| |
| |
| import org.apache.directory.api.asn1.DecoderException; |
| import org.apache.directory.api.asn1.ber.Asn1Container; |
| import org.apache.directory.api.asn1.ber.Asn1Decoder; |
| import org.apache.directory.api.asn1.ber.grammar.GrammarAction; |
| import org.apache.directory.api.asn1.ber.tlv.TLV; |
| import org.apache.directory.api.i18n.I18n; |
| import org.apache.directory.shared.kerberos.codec.checksum.ChecksumContainer; |
| import org.apache.directory.shared.kerberos.components.Checksum; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| |
| /** |
| * The action used to set the Checksum |
| * |
| * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> |
| */ |
| public abstract class AbstractReadCheckSum<E extends Asn1Container> extends GrammarAction<E> |
| { |
| /** The logger */ |
| private static final Logger LOG = LoggerFactory.getLogger( AbstractReadCheckSum.class ); |
| |
| /** Speedup for logs */ |
| private static final boolean IS_DEBUG = LOG.isDebugEnabled(); |
| |
| |
| /** |
| * Instantiates a new AbstractReadChecksum action. |
| */ |
| public AbstractReadCheckSum( String name ) |
| { |
| super( name ); |
| } |
| |
| |
| /** |
| * set the Checksum on the ASN.1 object of the container |
| * |
| * @param checksum the Checksum object |
| * @param container container holding the ASN.1 object |
| */ |
| protected abstract void setChecksum( Checksum checksum, E container ); |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public final void action( E container ) throws DecoderException |
| { |
| TLV tlv = container.getCurrentTLV(); |
| |
| // The Length should not be null |
| if ( tlv.getLength() == 0 ) |
| { |
| LOG.error( I18n.err( I18n.ERR_04066 ) ); |
| |
| // This will generate a PROTOCOL_ERROR |
| throw new DecoderException( I18n.err( I18n.ERR_04067 ) ); |
| } |
| |
| // Now, let's decode the Checksum |
| Asn1Decoder checksumDecoder = new Asn1Decoder(); |
| |
| ChecksumContainer checksumContainer = new ChecksumContainer(); |
| |
| // Decode the Checksum PDU |
| try |
| { |
| checksumDecoder.decode( container.getStream(), checksumContainer ); |
| } |
| catch ( DecoderException de ) |
| { |
| throw de; |
| } |
| |
| Checksum checksum = checksumContainer.getChecksum(); |
| |
| if ( IS_DEBUG ) |
| { |
| LOG.debug( "Checksum : " + checksum ); |
| } |
| |
| setChecksum( checksum, container ); |
| |
| // Update the expected length for the current TLV |
| tlv.setExpectedLength( tlv.getExpectedLength() - tlv.getLength() ); |
| |
| // Update the parent |
| container.updateParent(); |
| } |
| } |