    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 *      https://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
    018package org.apache.commons.net.chargen;
    019
    020import java.io.InputStream;
    021
    022import org.apache.commons.net.SocketClient;
    023
    024/**
    025 * The CharGenTCPClient class is a TCP implementation of a client for the character generator protocol described in RFC 864. It can also be used for Systat (RFC
    026 * 866), Quote of the Day (RFC 865), and netstat (port 15). All of these protocols involve connecting to the appropriate port, and reading data from an input
    027 * stream. The chargen protocol actually sends data until the receiving end closes the connection. All the others send only a fixed amount of data and then
    028 * close the connection.
    029 * <p>
    030 * To use the CharGenTCPClient class, just establish a connection with {@link org.apache.commons.net.SocketClient#connect connect} and call
    031 * {@link #getInputStream getInputStream()} to access the data. Don't close the input stream when you're done with it. Rather, call
    032 * {@link org.apache.commons.net.SocketClient#disconnect disconnect} to clean up properly.
    033 * </p>
    034 *
    035 * @see CharGenUDPClient
    036 */
    037public final class CharGenTCPClient extends SocketClient {
    038
    039    /** The systat port value of 11 according to RFC 866. */
    040    public static final int SYSTAT_PORT = 11;
    041
    042    /** The netstat port value of 19. */
    043    public static final int NETSTAT_PORT = 15;
    044
    045    /** The quote of the day port value of 17 according to RFC 865. */
    046    public static final int QUOTE_OF_DAY_PORT = 17;
    047
    048    /** The character generator port value of 19 according to RFC 864. */
    049    public static final int CHARGEN_PORT = 19;
    050
    051    /** The default chargen port. It is set to 19 according to RFC 864. */
    052    public static final int DEFAULT_PORT = 19;
    053
    054    /**
    055     * Constructs a new instance. It merely sets the default port to {@code DEFAULT_PORT}.
    056     */
    057    public CharGenTCPClient() {
    058        setDefaultPort(DEFAULT_PORT);
    059    }
    060
    061    /**
    062     * Gets an InputStream from which the server generated data can be read. You should NOT close the InputStream when you're finished reading from it.
    063     * Rather, you should call {@link org.apache.commons.net.SocketClient#disconnect disconnect} to clean up properly.
    064     *
    065     * @return An InputStream from which the server generated data can be read.
    066     */
    067    public InputStream getInputStream() {
    068        return _input_;
    069    }
    070}