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org.apache.commons.net.CharGenUDPClient |
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1 | /* |
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2 | * Copyright 2001-2005 The Apache Software Foundation |
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3 | * |
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4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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5 | * you may not use this file except in compliance with the License. |
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6 | * You may obtain a copy of the License at |
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7 | * |
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8 | * http://www.apache.org/licenses/LICENSE-2.0 |
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9 | * |
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10 | * Unless required by applicable law or agreed to in writing, software |
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11 | * distributed under the License is distributed on an "AS IS" BASIS, |
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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13 | * See the License for the specific language governing permissions and |
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14 | * limitations under the License. |
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15 | */ |
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16 | package org.apache.commons.net; |
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17 | ||
18 | import java.io.IOException; |
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19 | import java.net.DatagramPacket; |
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20 | import java.net.InetAddress; |
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21 | ||
22 | /*** |
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23 | * The CharGenUDPClient class is a UDP implementation of a client for the |
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24 | * character generator protocol described in RFC 864. It can also be |
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25 | * used for Systat (RFC 866), Quote of the Day (RFC 865), and netstat |
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26 | * (port 15). All of these protocols involve sending a datagram to the |
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27 | * appropriate port, and reading data contained in one or more reply |
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28 | * datagrams. The chargen and quote of the day protocols only send |
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29 | * one reply datagram containing 512 bytes or less of data. The other |
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30 | * protocols may reply with more than one datagram, in which case you |
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31 | * must wait for a timeout to determine that all reply datagrams have |
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32 | * been sent. |
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33 | * <p> |
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34 | * To use the CharGenUDPClient class, just open a local UDP port |
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35 | * with {@link org.apache.commons.net.DatagramSocketClient#open open } |
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36 | * and call {@link #send send } to send the datagram that will |
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37 | * initiate the data reply. For chargen or quote of the day, just |
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38 | * call {@link #receive receive }, and you're done. For netstat and |
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39 | * systat, call receive in a while loop, and catch a SocketException and |
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40 | * InterruptedIOException to detect a timeout (don't forget to set the |
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41 | * timeout duration beforehand). Don't forget to call |
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42 | * {@link org.apache.commons.net.DatagramSocketClient#close close() } |
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43 | * to clean up properly. |
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44 | * <p> |
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45 | * <p> |
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46 | * @author Daniel F. Savarese |
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47 | * @see CharGenTCPClient |
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48 | ***/ |
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49 | ||
50 | public final class CharGenUDPClient extends DatagramSocketClient |
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51 | { |
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52 | /*** The systat port value of 11 according to RFC 866. ***/ |
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53 | public static final int SYSTAT_PORT = 11; |
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54 | /*** The netstat port value of 19. ***/ |
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55 | public static final int NETSTAT_PORT = 15; |
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56 | /*** The quote of the day port value of 17 according to RFC 865. ***/ |
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57 | public static final int QUOTE_OF_DAY_PORT = 17; |
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58 | /*** The character generator port value of 19 according to RFC 864. ***/ |
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59 | public static final int CHARGEN_PORT = 19; |
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60 | /*** The default chargen port. It is set to 19 according to RFC 864. ***/ |
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61 | public static final int DEFAULT_PORT = 19; |
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62 | ||
63 | private byte[] __receiveData; |
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64 | private DatagramPacket __receivePacket; |
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65 | private DatagramPacket __sendPacket; |
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66 | ||
67 | /*** |
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68 | * The default CharGenUDPClient constructor. It initializes some internal |
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69 | * data structures for sending and receiving the necessary datagrams for |
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70 | * the chargen and related protocols. |
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71 | ***/ |
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72 | public CharGenUDPClient() |
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73 | 0 | { |
74 | // CharGen return packets have a maximum length of 512 |
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75 | 0 | __receiveData = new byte[512]; |
76 | 0 | __receivePacket = new DatagramPacket(__receiveData, 512); |
77 | 0 | __sendPacket = new DatagramPacket(class="keyword">new byte[0], 0); |
78 | 0 | } |
79 | ||
80 | ||
81 | /*** |
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82 | * Sends the data initiation datagram. This data in the packet is ignored |
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83 | * by the server, and merely serves to signal that the server should send |
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84 | * its reply. |
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85 | * <p> |
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86 | * @param host The address of the server. |
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87 | * @param port The port of the service. |
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88 | * @exception IOException If an error occurs while sending the datagram. |
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89 | ***/ |
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90 | public void send(InetAddress host, int port) throws IOException |
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91 | { |
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92 | 0 | __sendPacket.setAddress(host); |
93 | 0 | __sendPacket.setPort(port); |
94 | 0 | _socket_.send(__sendPacket); |
95 | 0 | } |
96 | ||
97 | /*** Same as <code>send(host, CharGenUDPClient.DEFAULT_PORT);</code> ***/ |
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98 | public void send(InetAddress host) throws IOException |
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99 | { |
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100 | 0 | send(host, DEFAULT_PORT); |
101 | 0 | } |
102 | ||
103 | /*** |
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104 | * Receive the reply data from the server. This will always be 512 bytes |
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105 | * or less. Chargen and quote of the day only return one packet. Netstat |
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106 | * and systat require multiple calls to receive() with timeout detection. |
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107 | * <p> |
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108 | * @return The reply data from the server. |
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109 | * @exception IOException If an error occurs while receiving the datagram. |
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110 | ***/ |
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111 | public byte[] receive() throws IOException |
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112 | { |
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113 | int length; |
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114 | byte[] result; |
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115 | ||
116 | 0 | _socket_.receive(__receivePacket); |
117 | ||
118 | 0 | result = new byte[length = __receivePacket.getLength()]; |
119 | 0 | System.arraycopy(__receiveData, 0, result, 0, length); |
120 | ||
121 | 0 | return result; |
122 | } |
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123 | ||
124 | } |
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125 |
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