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 * @see DiscardTCPClient 38 ***/ 39 40 public class DiscardUDPClient extends DatagramSocketClient 41 { 42 /*** The default discard port. It is set to 9 according to RFC 863. ***/ 43 public static final int DEFAULT_PORT = 9; 44 45 DatagramPacket _sendPacket; 46 47 public DiscardUDPClient() 48 { 49 _sendPacket = new DatagramPacket(new byte[0], 0); 50 } 51 52 53 /*** 54 * Sends the specified data to the specified server at the specified port. 55 * <p> 56 * @param data The discard data to send. 57 * @param length The length of the data to send. Should be less than 58 * or equal to the length of the data byte array. 59 * @param host The address of the server. 60 * @param port The service port. 61 * @exception IOException If an error occurs during the datagram send 62 * operation. 63 ***/ 64 public void send(byte[] data, int length, InetAddress host, int port) 65 throws IOException 66 { 67 _sendPacket.setData(data); 68 _sendPacket.setLength(length); 69 _sendPacket.setAddress(host); 70 _sendPacket.setPort(port); 71 _socket_.send(_sendPacket); 72 } 73 74 75 /*** 76 * Same as 77 * <code>send(data, length, host. DiscardUDPClient.DEFAULT_PORT)</code>. 78 ***/ 79 public void send(byte[] data, int length, InetAddress host) 80 throws IOException 81 { 82 send(data, length, host, DEFAULT_PORT); 83 } 84 85 86 /*** 87 * Same as 88 * <code>send(data, data.length, host. DiscardUDPClient.DEFAULT_PORT)</code>. 89 ***/ 90 public void send(byte[] data, InetAddress host) throws IOException 91 { 92 send(data, data.length, host, DEFAULT_PORT); 93 } 94 95 } 96