001 /* 002 * Copyright 2003-2004 The Apache Software Foundation 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 package org.apache.commons.net.telnet; 017 018 /*** 019 * Implements the telnet terminal type option RFC 1091. 020 * <p> 021 * @author Bruno D'Avanzo 022 ***/ 023 public class TerminalTypeOptionHandler extends TelnetOptionHandler 024 { 025 /*** 026 * Terminal type 027 ***/ 028 private String termType = null; 029 030 /*** 031 * Terminal type option 032 ***/ 033 protected static final int TERMINAL_TYPE = 24; 034 035 /*** 036 * Send (for subnegotiation) 037 ***/ 038 protected static final int TERMINAL_TYPE_SEND = 1; 039 040 /*** 041 * Is (for subnegotiation) 042 ***/ 043 protected static final int TERMINAL_TYPE_IS = 0; 044 045 /*** 046 * Constructor for the TerminalTypeOptionHandler. Allows defining desired 047 * initial setting for local/remote activation of this option and 048 * behaviour in case a local/remote activation request for this 049 * option is received. 050 * <p> 051 * @param termtype - terminal type that will be negotiated. 052 * @param initlocal - if set to true, a WILL is sent upon connection. 053 * @param initremote - if set to true, a DO is sent upon connection. 054 * @param acceptlocal - if set to true, any DO request is accepted. 055 * @param acceptremote - if set to true, any WILL request is accepted. 056 ***/ 057 public TerminalTypeOptionHandler(String termtype, 058 boolean initlocal, 059 boolean initremote, 060 boolean acceptlocal, 061 boolean acceptremote) 062 { 063 super(TelnetOption.TERMINAL_TYPE, initlocal, initremote, 064 acceptlocal, acceptremote); 065 termType = termtype; 066 } 067 068 /*** 069 * Constructor for the TerminalTypeOptionHandler. Initial and accept 070 * behaviour flags are set to false 071 * <p> 072 * @param termtype - terminal type that will be negotiated. 073 ***/ 074 public TerminalTypeOptionHandler(String termtype) 075 { 076 super(TelnetOption.TERMINAL_TYPE, false, false, false, false); 077 termType = termtype; 078 } 079 080 /*** 081 * Implements the abstract method of TelnetOptionHandler. 082 * <p> 083 * @param suboptionData - the sequence received, whithout IAC SB & IAC SE 084 * @param suboptionLength - the length of data in suboption_data 085 * <p> 086 * @return terminal type information 087 ***/ 088 public int[] answerSubnegotiation(int suboptionData[], int suboptionLength) 089 { 090 if ((suboptionData != null) && (suboptionLength > 1) 091 && (termType != null)) 092 { 093 if ((suboptionData[0] == TERMINAL_TYPE) 094 && (suboptionData[1] == TERMINAL_TYPE_SEND)) 095 { 096 int response[] = new int[termType.length() + 2]; 097 098 response[0] = TERMINAL_TYPE; 099 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 }