trunk/protocol-dns/src/main/java/org/apache/directory/server/dns/io/encoder/WellKnownServicesRecordEncoder.java

/*
 *  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.server.dns.io.encoder;


/**
 * 3.4.2. WKS RDATA format
 * 
 *     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 *     |                    ADDRESS                    |
 *     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 *     |       PROTOCOL        |                       |
 *     +--+--+--+--+--+--+--+--+                       |
 *     |                                               |
 *     /                   <BIT MAP>                   /
 *     /                                               /
 *     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 * 
 * where:
 * 
 * ADDRESS         An 32 bit Internet address
 * 
 * PROTOCOL        An 8 bit IP protocol number
 * 
 * <BIT MAP>       A variable length bit map.  The bit map must be a
 *                 multiple of 8 bits long.
 * 
 * The WKS record is used to describe the well known services supported by
 * a particular protocol on a particular internet address.  The PROTOCOL
 * field specifies an IP protocol number, and the bit map has one bit per
 * port of the specified protocol.  The first bit corresponds to port 0,
 * the second to port 1, etc.  If the bit map does not include a bit for a
 * protocol of interest, that bit is assumed zero.  The appropriate values
 * and mnemonics for ports and protocols are specified in [RFC-1010].
 * 
 * For example, if PROTOCOL=TCP (6), the 26th bit corresponds to TCP port
 * 25 (SMTP).  If this bit is set, a SMTP server should be listening on TCP
 * port 25; if zero, SMTP service is not supported on the specified
 * address.
 * 
 * The purpose of WKS RRs is to provide availability information for
 * servers for TCP and UDP.  If a server supports both TCP and UDP, or has
 * multiple Internet addresses, then multiple WKS RRs are used.
 * 
 * WKS RRs cause no additional section processing.
 * 
 * In master files, both ports and protocols are expressed using mnemonics
 * or decimal numbers.
 * 
 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
 */
public class WellKnownServicesRecordEncoder
{
}