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    
021    package org.apache.directory.server.dhcp.options.dhcp;
022    
023    
024    import org.apache.directory.server.dhcp.options.DhcpOption;
025    
026    
027    /**
028     * This option is used by DHCP clients to specify their unique
029     * identifier.  DHCP servers use this value to index their database of
030     * address bindings.  This value is expected to be unique for all
031     * clients in an administrative domain.
032     * 
033     * Identifiers SHOULD be treated as opaque objects by DHCP servers.
034     * 
035     * The client identifier MAY consist of type-value pairs similar to the
036     * 'htype'/'chaddr' fields. For instance, it MAY consist
037     * of a hardware type and hardware address. In this case the type field
038     * SHOULD be one of the ARP hardware types defined in STD2.  A
039     * hardware type of 0 (zero) should be used when the value field
040     * contains an identifier other than a hardware address (e.g. a fully
041     * qualified domain name).
042     * 
043     * For correct identification of clients, each client's client-
044     * identifier MUST be unique among the client-identifiers used on the
045     * subnet to which the client is attached.  Vendors and system
046     * administrators are responsible for choosing client-identifiers that
047     * meet this requirement for uniqueness.
048     * 
049     * The code for this option is 61, and its minimum length is 2.
050     * 
051     * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
052     * @version $Rev: 638228 $, $Date: 2008-03-18 07:12:41 +0100 (Tue, 18 Mar 2008) $
053     */
054    public class ClientIdentifier extends DhcpOption
055    {
056        /*
057         * @see org.apache.directory.server.dhcp.options.DhcpOption#getTag()
058         */
059        public byte getTag()
060        {
061            return 61;
062        }
063    }