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
018package org.apache.commons.net.telnet;
019
020/***
021 * The TelnetOption class cannot be instantiated and only serves as a
022 * storehouse for telnet option constants.
023 * <p>
024 * Details regarding Telnet option specification can be found in RFC 855.
025 *
026 *
027 * @see org.apache.commons.net.telnet.Telnet
028 * @see org.apache.commons.net.telnet.TelnetClient
029 ***/
030
031public class TelnetOption
032{
033    /*** The maximum value an option code can have.  This value is 255. ***/
034    public static final int MAX_OPTION_VALUE = 255;
035
036    public static final int BINARY = 0;
037
038    public static final int ECHO = 1;
039
040    public static final int PREPARE_TO_RECONNECT = 2;
041
042    public static final int SUPPRESS_GO_AHEAD = 3;
043
044    public static final int APPROXIMATE_MESSAGE_SIZE = 4;
045
046    public static final int STATUS = 5;
047
048    public static final int TIMING_MARK = 6;
049
050    public static final int REMOTE_CONTROLLED_TRANSMISSION = 7;
051
052    public static final int NEGOTIATE_OUTPUT_LINE_WIDTH = 8;
053
054    public static final int NEGOTIATE_OUTPUT_PAGE_SIZE = 9;
055
056    public static final int NEGOTIATE_CARRIAGE_RETURN = 10;
057
058    public static final int NEGOTIATE_HORIZONTAL_TAB_STOP = 11;
059
060    public static final int NEGOTIATE_HORIZONTAL_TAB = 12;
061
062    public static final int NEGOTIATE_FORMFEED = 13;
063
064    public static final int NEGOTIATE_VERTICAL_TAB_STOP = 14;
065
066    public static final int NEGOTIATE_VERTICAL_TAB = 15;
067
068    public static final int NEGOTIATE_LINEFEED = 16;
069
070    public static final int EXTENDED_ASCII = 17;
071
072    public static final int FORCE_LOGOUT = 18;
073
074    public static final int BYTE_MACRO = 19;
075
076    public static final int DATA_ENTRY_TERMINAL = 20;
077
078    public static final int SUPDUP = 21;
079
080    public static final int SUPDUP_OUTPUT = 22;
081
082    public static final int SEND_LOCATION = 23;
083
084    public static final int TERMINAL_TYPE = 24;
085
086    public static final int END_OF_RECORD = 25;
087
088    public static final int TACACS_USER_IDENTIFICATION = 26;
089
090    public static final int OUTPUT_MARKING = 27;
091
092    public static final int TERMINAL_LOCATION_NUMBER = 28;
093
094    public static final int REGIME_3270 = 29;
095
096    public static final int X3_PAD = 30;
097
098    public static final int WINDOW_SIZE = 31;
099
100    public static final int TERMINAL_SPEED = 32;
101
102    public static final int REMOTE_FLOW_CONTROL = 33;
103
104    public static final int LINEMODE = 34;
105
106    public static final int X_DISPLAY_LOCATION = 35;
107
108    public static final int OLD_ENVIRONMENT_VARIABLES = 36;
109
110    public static final int AUTHENTICATION = 37;
111
112    public static final int ENCRYPTION = 38;
113
114    public static final int NEW_ENVIRONMENT_VARIABLES = 39;
115
116    public static final int EXTENDED_OPTIONS_LIST = 255;
117
118    @SuppressWarnings("unused")
119    private static final int __FIRST_OPTION = BINARY;
120    private static final int __LAST_OPTION = EXTENDED_OPTIONS_LIST;
121
122    private static final String __optionString[] = {
123                "BINARY", "ECHO", "RCP", "SUPPRESS GO AHEAD", "NAME", "STATUS",
124                "TIMING MARK", "RCTE", "NAOL", "NAOP", "NAOCRD", "NAOHTS", "NAOHTD",
125                "NAOFFD", "NAOVTS", "NAOVTD", "NAOLFD", "EXTEND ASCII", "LOGOUT",
126                "BYTE MACRO", "DATA ENTRY TERMINAL", "SUPDUP", "SUPDUP OUTPUT",
127                "SEND LOCATION", "TERMINAL TYPE", "END OF RECORD", "TACACS UID",
128                "OUTPUT MARKING", "TTYLOC", "3270 REGIME", "X.3 PAD", "NAWS", "TSPEED",
129                "LFLOW", "LINEMODE", "XDISPLOC", "OLD-ENVIRON", "AUTHENTICATION",
130                "ENCRYPT", "NEW-ENVIRON", "TN3270E", "XAUTH", "CHARSET", "RSP",
131                "Com Port Control", "Suppress Local Echo", "Start TLS",
132                "KERMIT", "SEND-URL", "FORWARD_X", "", "", "",
133                "", "", "", "", "", "", "", "", "", "",
134                "", "", "", "", "", "", "", "", "", "",
135                "", "", "", "", "", "", "", "", "", "",
136                "", "", "", "", "", "", "", "", "", "",
137                "", "", "", "", "", "", "", "", "", "",
138                "", "", "", "", "", "", "", "", "", "",
139                "", "", "", "", "", "", "", "", "", "",
140                "", "", "", "", "", "", "", "", "", "",
141                "", "", "", "", "", "TELOPT PRAGMA LOGON", "TELOPT SSPI LOGON",
142                "TELOPT PRAGMA HEARTBEAT", "", "", "", "",
143                "", "", "", "", "", "", "", "", "", "",
144                "", "", "", "", "", "", "", "", "", "",
145                "", "", "", "", "", "", "", "", "", "",
146                "", "", "", "", "", "", "", "", "", "",
147                "", "", "", "", "", "", "", "", "", "",
148                "", "", "", "", "", "", "", "", "", "",
149                "", "", "", "", "", "", "", "", "", "",
150                "", "", "", "", "", "", "", "", "", "",
151                "", "", "", "", "", "", "", "", "", "",
152                "", "", "", "", "", "", "", "", "", "",
153                "", "", "", "", "", "", "", "", "", "",
154                "Extended-Options-List"
155            };
156
157
158    /***
159     * Returns the string representation of the telnet protocol option
160     * corresponding to the given option code.
161     *
162     * @param code The option code of the telnet protocol option
163     * @return The string representation of the telnet protocol option.
164     ***/
165    public static final String getOption(int code)
166    {
167        if(__optionString[code].length() == 0)
168        {
169            return "UNASSIGNED";
170        }
171        else
172        {
173            return __optionString[code];
174        }
175    }
176
177
178    /***
179     * Determines if a given option code is valid.  Returns true if valid,
180     * false if not.
181     *
182     * @param code  The option code to test.
183     * @return True if the option code is valid, false if not.
184     **/
185    public static final boolean isValidOption(int code)
186    {
187        return (code <= __LAST_OPTION);
188    }
189
190    // Cannot be instantiated
191    private TelnetOption()
192    { }
193}