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 */ 020 package org.apache.directory.server.kerberos.protocol; 021 022 023 import org.apache.directory.server.i18n.I18n; 024 import org.apache.directory.server.kerberos.shared.io.decoder.KdcRequestDecoder; 025 import org.apache.mina.core.buffer.IoBuffer; 026 import org.apache.mina.core.session.IoSession; 027 import org.apache.mina.filter.codec.CumulativeProtocolDecoder; 028 import org.apache.mina.filter.codec.ProtocolDecoderOutput; 029 030 031 /** 032 * A {@link CumulativeProtocolDecoder} which supports Kerberos operation over TCP, 033 * by reassembling split packets prior to ASN.1 DER decoding. 034 * 035 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 036 * @version $Rev$, $Date$ 037 */ 038 public class KerberosTcpDecoder extends CumulativeProtocolDecoder 039 { 040 private KdcRequestDecoder decoder = new KdcRequestDecoder(); 041 042 private int maxObjectSize = 16384; // 16KB 043 044 045 /** 046 * Returns the allowed maximum size of the object to be decoded. 047 * If the size of the object to be decoded exceeds this value, this 048 * decoder will throw a {@link BufferDataException}. The default 049 * value is <tt>16384</tt> (16KB). 050 * 051 * @return The max object size. 052 */ 053 public int getMaxObjectSize() 054 { 055 return maxObjectSize; 056 } 057 058 059 /** 060 * Sets the allowed maximum size of the object to be decoded. 061 * If the size of the object to be decoded exceeds this value, this 062 * decoder will throw a {@link BufferDataException}. The default 063 * value is <tt>16384</tt> (16KB). 064 * 065 * @param maxObjectSize 066 */ 067 public void setMaxObjectSize( int maxObjectSize ) 068 { 069 if ( maxObjectSize <= 0 ) 070 { 071 throw new IllegalArgumentException( I18n.err( I18n.ERR_634, maxObjectSize ) ); 072 } 073 074 this.maxObjectSize = maxObjectSize; 075 } 076 077 078 @Override 079 protected boolean doDecode( IoSession session, IoBuffer in, ProtocolDecoderOutput out ) throws Exception 080 { 081 if ( !in.prefixedDataAvailable( 4, maxObjectSize ) ) 082 { 083 return false; 084 } 085 086 in.getInt(); 087 088 out.write( decoder.decode( in.buf() ) ); 089 090 return true; 091 } 092 }