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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