1. /*

  2.  * Copyright 2003-2004 The Apache Software Foundation

  3.  *

  4.  * Licensed under the Apache License, Version 2.0 (the "License");

  5.  * you may not use this file except in compliance with the License.

  6.  * You may obtain a copy of the License at

  7.  *

  8.  *     http://www.apache.org/licenses/LICENSE-2.0

  9.  *

  10.  * Unless required by applicable law or agreed to in writing, software

  11.  * distributed under the License is distributed on an "AS IS" BASIS,

  12.  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  13.  * See the License for the specific language governing permissions and

  14.  * limitations under the License.

  15.  */

  16. package org.apache.commons.net.telnet;

  17. 

  18. /***

  19.  * Implements the telnet terminal type option RFC 1091.

  20.  * <p>

  21.  * @author Bruno D'Avanzo

  22.  ***/

  23. public class TerminalTypeOptionHandler extends TelnetOptionHandler

  24. {

  25.     /***

  26.      * Terminal type

  27.      ***/

  28.     private String termType = null;

  29. 

  30.     /***

  31.      * Terminal type option

  32.      ***/

  33.     protected static final int TERMINAL_TYPE = 24;

  34. 

  35.     /***

  36.      * Send (for subnegotiation)

  37.      ***/

  38.     protected static final int TERMINAL_TYPE_SEND =  1;

  39. 

  40.     /***

  41.      * Is (for subnegotiation)

  42.      ***/

  43.     protected static final int TERMINAL_TYPE_IS =  0;

  44. 

  45.     /***

  46.      * Constructor for the TerminalTypeOptionHandler. Allows defining desired

  47.      * initial setting for local/remote activation of this option and

  48.      * behaviour in case a local/remote activation request for this

  49.      * option is received.

  50.      * <p>

  51.      * @param termtype - terminal type that will be negotiated.

  52.      * @param initlocal - if set to true, a WILL is sent upon connection.

  53.      * @param initremote - if set to true, a DO is sent upon connection.

  54.      * @param acceptlocal - if set to true, any DO request is accepted.

  55.      * @param acceptremote - if set to true, any WILL request is accepted.

  56.      ***/

  57.     public TerminalTypeOptionHandler(String termtype,

  58.                                 boolean initlocal,

  59.                                 boolean initremote,

  60.                                 boolean acceptlocal,

  61.                                 boolean acceptremote)

  62.     {

  63.         super(TelnetOption.TERMINAL_TYPE, initlocal, initremote,

  64.                                       acceptlocal, acceptremote);

  65.         termType = termtype;

  66.     }

  67. 

  68.     /***

  69.      * Constructor for the TerminalTypeOptionHandler. Initial and accept

  70.      * behaviour flags are set to false

  71.      * <p>

  72.      * @param termtype - terminal type that will be negotiated.

  73.      ***/

  74.     public TerminalTypeOptionHandler(String termtype)

  75.     {

  76.         super(TelnetOption.TERMINAL_TYPE, false, false, false, false);

  77.         termType = termtype;

  78.     }

  79. 

  80.     /***

  81.      * Implements the abstract method of TelnetOptionHandler.

  82.      * <p>

  83.      * @param suboptionData - the sequence received, whithout IAC SB & IAC SE

  84.      * @param suboptionLength - the length of data in suboption_data

  85.      * <p>

  86.      * @return terminal type information

  87.      ***/

  88.     public int[] answerSubnegotiation(int suboptionData[], int suboptionLength)

  89.     {

  90.         if ((suboptionData != null) && (suboptionLength > 1)

  91.             && (termType != null))

  92.         {

  93.             if ((suboptionData[0] == TERMINAL_TYPE)

  94.                 && (suboptionData[1] == TERMINAL_TYPE_SEND))

  95.             {

  96.                 int response[] = new int[termType.length() + 2];

  97. 

  98.                 response[0] = TERMINAL_TYPE;

  99.                 response[1] = TERMINAL_TYPE_IS;

  100. 

  101.                 for (int ii = 0; ii < termType.length(); ii++)

  102.                 {

  103.                     response[ii + 2] = (int) termType.charAt(ii);

  104.                 }

  105. 

  106.                 return response;

  107.             }

  108.         }

  109.         return null;

  110.     }

  111. 

  112.     /***

  113.      * Implements the abstract method of TelnetOptionHandler.

  114.      * <p>

  115.      * @return always null (no response to subnegotiation)

  116.      ***/

  117.     public int[] startSubnegotiationLocal()

  118.     {

  119.         return null;

  120.     }

  121. 

  122.     /***

  123.      * Implements the abstract method of TelnetOptionHandler.

  124.      * <p>

  125.      * @return always null (no response to subnegotiation)

  126.      ***/

  127.     public int[] startSubnegotiationRemote()

  128.     {

  129.         return null;

  130.     }

  131. }