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 package org.apache.commons.net;
18
19 import java.io.IOException;
20 import java.net.DatagramPacket;
21 import java.net.InetAddress;
22
23 /***
24 * The DiscardUDPClient class is a UDP implementation of a client for the
25 * Discard protocol described in RFC 863. To use the class,
26 * just open a local UDP port
27 * with {@link org.apache.commons.net.DatagramSocketClient#open open }
28 * and call {@link #send send } to send datagrams to the server
29 * After you're done sending discard data, call
30 * {@link org.apache.commons.net.DatagramSocketClient#close close() }
31 * to clean up properly.
32 * <p>
33 * <p>
34 * @author Daniel F. Savarese
35 * @see DiscardTCPClient
36 ***/
37
38 public class DiscardUDPClient extends DatagramSocketClient
39 {
40 /*** The default discard port. It is set to 9 according to RFC 863. ***/
41 public static final int DEFAULT_PORT = 9;
42
43 DatagramPacket _sendPacket;
44
45 public DiscardUDPClient()
46 {
47 _sendPacket = new DatagramPacket(new byte[0], 0);
48 }
49
50
51 /***
52 * Sends the specified data to the specified server at the specified port.
53 * <p>
54 * @param data The discard data to send.
55 * @param length The length of the data to send. Should be less than
56 * or equal to the length of the data byte array.
57 * @param host The address of the server.
58 * @param port The service port.
59 * @exception IOException If an error occurs during the datagram send
60 * operation.
61 ***/
62 public void send(byte[] data, int length, InetAddress host, int port)
63 throws IOException
64 {
65 _sendPacket.setData(data);
66 _sendPacket.setLength(length);
67 _sendPacket.setAddress(host);
68 _sendPacket.setPort(port);
69 _socket_.send(_sendPacket);
70 }
71
72
73 /***
74 * Same as
75 * <code>send(data, length, host. DiscardUDPClient.DEFAULT_PORT)</code>.
76 ***/
77 public void send(byte[] data, int length, InetAddress host)
78 throws IOException
79 {
80 send(data, length, host, DEFAULT_PORT);
81 }
82
83
84 /***
85 * Same as
86 * <code>send(data, data.length, host. DiscardUDPClient.DEFAULT_PORT)</code>.
87 ***/
88 public void send(byte[] data, InetAddress host) throws IOException
89 {
90 send(data, data.length, host, DEFAULT_PORT);
91 }
92
93 }
94