commons-net.jar is the bytecode of Apache Commons Net library, which implements the client side of many basic Internet protocols.

Apache Commons Net Source Code files are provided in the binary packge (commons-net-3.8.0-bin.zip). You can download it at Apache Commons Net Website.

The source code of commons-net-3.8.0.jar is provided below:

⏎ org/apache/commons/net/telnet/TelnetCommand.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.commons.net.telnet;

/**
 * The TelnetCommand class cannot be instantiated and only serves as a
 * storehouse for telnet command constants.
 * @see org.apache.commons.net.telnet.Telnet
 * @see org.apache.commons.net.telnet.TelnetClient
 */

public final class TelnetCommand
{
    /** The maximum value a command code can have.  This value is 255. */
    public static final int MAX_COMMAND_VALUE = 255;

    /** Interpret As Command code.  Value is 255 according to RFC 854. */
    public static final int IAC = 255;

    /** Don't use option code.  Value is 254 according to RFC 854. */
    public static final int DONT = 254;

    /** Request to use option code.  Value is 253 according to RFC 854. */
    public static final int DO = 253;

    /** Refuse to use option code.  Value is 252 according to RFC 854. */
    public static final int WONT = 252;

    /** Agree to use option code.  Value is 251 according to RFC 854. */
    public static final int WILL = 251;

    /** Start subnegotiation code.  Value is 250 according to RFC 854. */
    public static final int SB = 250;

    /** Go Ahead code.  Value is 249 according to RFC 854. */
    public static final int GA = 249;

    /** Erase Line code.  Value is 248 according to RFC 854. */
    public static final int EL = 248;

    /** Erase Character code.  Value is 247 according to RFC 854. */
    public static final int EC = 247;

    /** Are You There code.  Value is 246 according to RFC 854. */
    public static final int AYT = 246;

    /** Abort Output code.  Value is 245 according to RFC 854. */
    public static final int AO = 245;

    /** Interrupt Process code.  Value is 244 according to RFC 854. */
    public static final int IP = 244;

    /** Break code.  Value is 243 according to RFC 854. */
    public static final int BREAK = 243;

    /** Data mark code.  Value is 242 according to RFC 854. */
    public static final int DM = 242;

    /** No Operation code.  Value is 241 according to RFC 854. */
    public static final int NOP = 241;

    /** End subnegotiation code.  Value is 240 according to RFC 854. */
    public static final int SE = 240;

    /** End of record code.  Value is 239. */
    public static final int EOR = 239;

    /** Abort code.  Value is 238. */
    public static final int ABORT = 238;

    /** Suspend process code.  Value is 237. */
    public static final int SUSP = 237;

    /** End of file code.  Value is 236. */
    public static final int EOF = 236;

    /** Synchronize code.  Value is 242. */
    public static final int SYNCH = 242;

    /** String representations of commands. */
    private static final String commandString[] = {
                "IAC", "DONT", "DO", "WONT", "WILL", "SB", "GA", "EL", "EC", "AYT",
                "AO", "IP", "BRK", "DMARK", "NOP", "SE", "EOR", "ABORT", "SUSP", "EOF"
            };

    private static final int FIRST_COMMAND = IAC;
    private static final int LAST_COMMAND = EOF;

    /**
     * Returns the string representation of the telnet protocol command
     * corresponding to the given command code.
     * <p>
     * @param code The command code of the telnet protocol command.
     * @return The string representation of the telnet protocol command.
     */
    public static String getCommand(final int code)
    {
        return commandString[FIRST_COMMAND - code];
    }

    /**
     * Determines if a given command code is valid.  Returns true if valid,
     * false if not.
     * <p>
     * @param code  The command code to test.
     * @return True if the command code is valid, false if not.
     **/
    public static boolean isValidCommand(final int code)
    {
        return code <= FIRST_COMMAND && code >= LAST_COMMAND;
    }

    // Cannot be instantiated
    private TelnetCommand()
    { }
}

⏎ org/apache/commons/net/telnet/TelnetCommand.java

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File name: commons-net-3.8.0-sources.jar
File size: 437325 bytes
Release date: 2020-01-22
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