1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 package org.apache.commons.net.discard; 19 20 import java.io.IOException; 21 import java.net.DatagramPacket; 22 import java.net.InetAddress; 23 24 import org.apache.commons.net.DatagramSocketClient; 25 26 /*** 27 * The DiscardUDPClient class is a UDP implementation of a client for the 28 * Discard protocol described in RFC 863. To use the class, 29 * just open a local UDP port 30 * with {@link org.apache.commons.net.DatagramSocketClient#open open } 31 * and call {@link #send send } to send datagrams to the server 32 * After you're done sending discard data, call 33 * {@link org.apache.commons.net.DatagramSocketClient#close close() } 34 * to clean up properly. 35 * <p> 36 * <p> 37 * @author Daniel F. Savarese 38 * @see DiscardTCPClient 39 ***/ 40 41 public class DiscardUDPClient extends DatagramSocketClient 42 { 43 /*** The default discard port. It is set to 9 according to RFC 863. ***/ 44 public static final int DEFAULT_PORT = 9; 45 46 DatagramPacket _sendPacket; 47 48 public DiscardUDPClient() 49 { 50 _sendPacket = new DatagramPacket(new byte[0], 0); 51 } 52 53 54 /*** 55 * Sends the specified data to the specified server at the specified port. 56 * <p> 57 * @param data The discard data to send. 58 * @param length The length of the data to send. Should be less than 59 * or equal to the length of the data byte array. 60 * @param host The address of the server. 61 * @param port The service port. 62 * @exception IOException If an error occurs during the datagram send 63 * operation. 64 ***/ 65 public void send(byte[] data, int length, InetAddress host, int port) 66 throws IOException 67 { 68 _sendPacket.setData(data); 69 _sendPacket.setLength(length); 70 _sendPacket.setAddress(host); 71 _sendPacket.setPort(port); 72 _socket_.send(_sendPacket); 73 } 74 75 76 /*** 77 * Same as 78 * <code>send(data, length, host. DiscardUDPClient.DEFAULT_PORT)</code>. 79 ***/ 80 public void send(byte[] data, int length, InetAddress host) 81 throws IOException 82 { 83 send(data, length, host, DEFAULT_PORT); 84 } 85 86 87 /*** 88 * Same as 89 * <code>send(data, data.length, host. DiscardUDPClient.DEFAULT_PORT)</code>. 90 ***/ 91 public void send(byte[] data, InetAddress host) throws IOException 92 { 93 send(data, data.length, host, DEFAULT_PORT); 94 } 95 96 } 97