001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017
018 package org.apache.commons.net.chargen;
019
020 import java.io.InputStream;
021
022 import org.apache.commons.net.SocketClient;
023
024 /***
025 * The CharGenTCPClient class is a TCP implementation of a client for the
026 * character generator protocol described in RFC 864. It can also be
027 * used for Systat (RFC 866), Quote of the Day (RFC 865), and netstat
028 * (port 15). All of these protocols involve connecting to the appropriate
029 * port, and reading data from an input stream. The chargen protocol
030 * actually sends data until the receiving end closes the connection. All
031 * of the others send only a fixed amount of data and then close the
032 * connection.
033 * <p>
034 * To use the CharGenTCPClient class, just establish a
035 * connection with
036 * {@link org.apache.commons.net.SocketClient#connect connect }
037 * and call {@link #getInputStream getInputStream() } to access
038 * the data. Don't close the input stream when you're done with it. Rather,
039 * call {@link org.apache.commons.net.SocketClient#disconnect disconnect }
040 * to clean up properly.
041 * <p>
042 * <p>
043 * @author Daniel F. Savarese
044 * @see CharGenUDPClient
045 ***/
046
047 public final class CharGenTCPClient extends SocketClient
048 {
049 /*** The systat port value of 11 according to RFC 866. ***/
050 public static final int SYSTAT_PORT = 11;
051 /*** The netstat port value of 19. ***/
052 public static final int NETSTAT_PORT = 15;
053 /*** The quote of the day port value of 17 according to RFC 865. ***/
054 public static final int QUOTE_OF_DAY_PORT = 17;
055 /*** The character generator port value of 19 according to RFC 864. ***/
056 public static final int CHARGEN_PORT = 19;
057 /*** The default chargen port. It is set to 19 according to RFC 864. ***/
058 public static final int DEFAULT_PORT = 19;
059
060 /***
061 * The default constructor for CharGenTCPClient. It merely sets the
062 * default port to <code> DEFAULT_PORT </code>.
063 ***/
064 public CharGenTCPClient ()
065 {
066 setDefaultPort(DEFAULT_PORT);
067 }
068
069 /***
070 * Returns an InputStream from which the server generated data can be
071 * read. You should NOT close the InputStream when you're finished
072 * reading from it. Rather, you should call
073 * {@link org.apache.commons.net.SocketClient#disconnect disconnect }
074 * to clean up properly.
075 * <p>
076 * @return An InputStream from which the server generated data can be read.
077 ***/
078 public InputStream getInputStream()
079 {
080 return _input_;
081 }
082 }
083
084
085
086