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.dns.io.encoder;
022    
023    
024    /**
025     * 3.4.2. WKS RDATA format
026     * 
027     *     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
028     *     |                    ADDRESS                    |
029     *     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
030     *     |       PROTOCOL        |                       |
031     *     +--+--+--+--+--+--+--+--+                       |
032     *     |                                               |
033     *     /                   <BIT MAP>                   /
034     *     /                                               /
035     *     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
036     * 
037     * where:
038     * 
039     * ADDRESS         An 32 bit Internet address
040     * 
041     * PROTOCOL        An 8 bit IP protocol number
042     * 
043     * <BIT MAP>       A variable length bit map.  The bit map must be a
044     *                 multiple of 8 bits long.
045     * 
046     * The WKS record is used to describe the well known services supported by
047     * a particular protocol on a particular internet address.  The PROTOCOL
048     * field specifies an IP protocol number, and the bit map has one bit per
049     * port of the specified protocol.  The first bit corresponds to port 0,
050     * the second to port 1, etc.  If the bit map does not include a bit for a
051     * protocol of interest, that bit is assumed zero.  The appropriate values
052     * and mnemonics for ports and protocols are specified in [RFC-1010].
053     * 
054     * For example, if PROTOCOL=TCP (6), the 26th bit corresponds to TCP port
055     * 25 (SMTP).  If this bit is set, a SMTP server should be listening on TCP
056     * port 25; if zero, SMTP service is not supported on the specified
057     * address.
058     * 
059     * The purpose of WKS RRs is to provide availability information for
060     * servers for TCP and UDP.  If a server supports both TCP and UDP, or has
061     * multiple Internet addresses, then multiple WKS RRs are used.
062     * 
063     * WKS RRs cause no additional section processing.
064     * 
065     * In master files, both ports and protocols are expressed using mnemonics
066     * or decimal numbers.
067     * 
068     * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
069     * @version $Rev: 501160 $, $Date: 2007-01-29 21:41:33 +0200 (Mon, 29 Jan 2007) $
070     */
071    public class WellKnownServicesRecordEncoder
072    {
073    }