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1 package org.apache.commons.net; 2 3 /* ==================================================================== 4 * The Apache Software License, Version 1.1 5 * 6 * Copyright (c) 2001 The Apache Software Foundation. All rights 7 * reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 21 * 3. The end-user documentation included with the redistribution, 22 * if any, must include the following acknowledgment: 23 * "This product includes software developed by the 24 * Apache Software Foundation (http://www.apache.org/)." 25 * Alternately, this acknowledgment may appear in the software itself, 26 * if and wherever such third-party acknowledgments normally appear. 27 * 28 * 4. The names "Apache" and "Apache Software Foundation" and 29 * "Apache Commons" must not be used to endorse or promote products 30 * derived from this software without prior written permission. For 31 * written permission, please contact apache@apache.org. 32 * 33 * 5. Products derived from this software may not be called "Apache", 34 * nor may "Apache" appear in their name, without 35 * prior written permission of the Apache Software Foundation. 36 * 37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED 38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 40 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR 41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 43 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 44 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 45 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 46 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 47 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 48 * SUCH DAMAGE. 49 * ==================================================================== 50 * 51 * This software consists of voluntary contributions made by many 52 * individuals on behalf of the Apache Software Foundation. For more 53 * information on the Apache Software Foundation, please see 54 * <http://www.apache.org/>;. 55 */ 56 57 import java.io.IOException; 58 import java.net.DatagramPacket; 59 import java.net.InetAddress; 60 61 /**** 62 * The DiscardUDPClient class is a UDP implementation of a client for the 63 * Discard protocol described in RFC 863. To use the class, 64 * just open a local UDP port 65 * with <a href="org.apache.commons.net.DatagramSocketClient.html#open"> open </a> 66 * and call <a href="#send"> send </a> to send datagrams to the server 67 * After you're done sending discard data, call 68 * <a href="org.apache.commons.net.DatagramSocketClient.html#close"> close() </a> 69 * to clean up properly. 70 * <p> 71 * <p> 72 * @author Daniel F. Savarese 73 * @see DiscardTCPClient 74 ***/ 75 76 public class DiscardUDPClient extends DatagramSocketClient 77 { 78 /**** The default discard port. It is set to 9 according to RFC 863. ***/ 79 public static final int DEFAULT_PORT = 9; 80 81 DatagramPacket _sendPacket; 82 83 public DiscardUDPClient() 84 { 85 _sendPacket = new DatagramPacket(new byte[0], 0); 86 } 87 88 89 /**** 90 * Sends the specified data to the specified server at the specified port. 91 * <p> 92 * @param data The discard data to send. 93 * @param length The length of the data to send. Should be less than 94 * or equal to the length of the data byte array. 95 * @param host The address of the server. 96 * @param port The service port. 97 * @exception IOException If an error occurs during the datagram send 98 * operation. 99 ***/ 100 public void send(byte[] data, int length, InetAddress host, int port) 101 throws IOException 102 { 103 _sendPacket.setData(data); 104 _sendPacket.setLength(length); 105 _sendPacket.setAddress(host); 106 _sendPacket.setPort(port); 107 _socket_.send(_sendPacket); 108 } 109 110 111 /**** 112 * Same as 113 * <code>send(data, length, host. DiscardUDPClient.DEFAULT_PORT)</code>. 114 ***/ 115 public void send(byte[] data, int length, InetAddress host) 116 throws IOException 117 { 118 send(data, length, host, DEFAULT_PORT); 119 } 120 121 122 /**** 123 * Same as 124 * <code>send(data, data.length, host. DiscardUDPClient.DEFAULT_PORT)</code>. 125 ***/ 126 public void send(byte[] data, InetAddress host) throws IOException 127 { 128 send(data, data.length, host, DEFAULT_PORT); 129 } 130 131 } 132

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