/*
* 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;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.OutputStream;
import java.io.IOException;
import org.apache.commons.net.SocketClient;
/**
* @author Daniel F. Savarese
* @author Bruno D'Avanzo
*/
class Telnet extends SocketClient
{
static final boolean debug = /*true;*/ false;
static final boolean debugoptions = /*true;*/ false;
static final byte[] _COMMAND_DO = {
(byte)TelnetCommand.IAC, (byte)TelnetCommand.DO
};
static final byte[] _COMMAND_DONT = {
(byte)TelnetCommand.IAC, (byte)TelnetCommand.DONT
};
static final byte[] _COMMAND_WILL = {
(byte)TelnetCommand.IAC, (byte)TelnetCommand.WILL
};
static final byte[] _COMMAND_WONT = {
(byte)TelnetCommand.IAC, (byte)TelnetCommand.WONT
};
static final byte[] _COMMAND_SB = {
(byte)TelnetCommand.IAC, (byte)TelnetCommand.SB
};
static final byte[] _COMMAND_SE = {
(byte)TelnetCommand.IAC, (byte)TelnetCommand.SE
};
static final int _WILL_MASK = 0x01, _DO_MASK = 0x02,
_REQUESTED_WILL_MASK = 0x04, _REQUESTED_DO_MASK = 0x08;
/* public */
static final int DEFAULT_PORT = 23;
int[] _doResponse, _willResponse, _options;
/* TERMINAL-TYPE option (start)*/
/***
* Terminal type option
***/
protected static final int TERMINAL_TYPE = 24;
/***
* Send (for subnegotiation)
***/
protected static final int TERMINAL_TYPE_SEND = 1;
/***
* Is (for subnegotiation)
***/
protected static final int TERMINAL_TYPE_IS = 0;
/***
* Is sequence (for subnegotiation)
***/
static final byte[] _COMMAND_IS = {
(byte) TERMINAL_TYPE, (byte) TERMINAL_TYPE_IS
};
/***
* Terminal type
***/
private String terminalType = null;
/* TERMINAL-TYPE option (end)*/
/* open TelnetOptionHandler functionality (start)*/
/***
* Array of option handlers
***/
private TelnetOptionHandler optionHandlers[];
/* open TelnetOptionHandler functionality (end)*/
/* Code Section added for supporting AYT (start)*/
/***
* AYT sequence
***/
static final byte[] _COMMAND_AYT = {
(byte) TelnetCommand.IAC, (byte) TelnetCommand.AYT
};
/***
* monitor to wait for AYT
***/
private Object aytMonitor = new Object();
/***
* flag for AYT
***/
private boolean aytFlag = true;
/* Code Section added for supporting AYT (end)*/
/***
* The stream on which to spy
***/
private OutputStream spyStream = null;
/***
* The notification handler
***/
private TelnetNotificationHandler __notifhand = null;
/***
* Empty Constructor
***/
Telnet()
{
setDefaultPort(DEFAULT_PORT);
_doResponse = new int[TelnetOption.MAX_OPTION_VALUE + 1];
_willResponse = new int[TelnetOption.MAX_OPTION_VALUE + 1];
_options = new int[TelnetOption.MAX_OPTION_VALUE + 1];
optionHandlers =
new TelnetOptionHandler[TelnetOption.MAX_OPTION_VALUE + 1];
}
/* TERMINAL-TYPE option (start)*/
/***
* This constructor lets you specify the terminal type.
* <p>
* @param termtype - terminal type to be negotiated (ej. VT100)
***/
Telnet(String termtype)
{
setDefaultPort(DEFAULT_PORT);
_doResponse = new int[TelnetOption.MAX_OPTION_VALUE + 1];
_willResponse = new int[TelnetOption.MAX_OPTION_VALUE + 1];
_options = new int[TelnetOption.MAX_OPTION_VALUE + 1];
terminalType = termtype;
optionHandlers =
new TelnetOptionHandler[TelnetOption.MAX_OPTION_VALUE + 1];
}
/* TERMINAL-TYPE option (end)*/
/***
* Looks for the state of the option.
* <p>
* @return returns true if a will has been acknowledged
* <p>
* @param option - option code to be looked up.
***/
boolean _stateIsWill(int option)
{
return ((_options[option] & _WILL_MASK) != 0);
}
/***
* Looks for the state of the option.
* <p>
* @return returns true if a wont has been acknowledged
* <p>
* @param option - option code to be looked up.
***/
boolean _stateIsWont(int option)
{
return !_stateIsWill(option);
}
/***
* Looks for the state of the option.
* <p>
* @return returns true if a do has been acknowledged
* <p>
* @param option - option code to be looked up.
***/
boolean _stateIsDo(int option)
{
return ((_options[option] & _DO_MASK) != 0);
}
/***
* Looks for the state of the option.
* <p>
* @return returns true if a dont has been acknowledged
* <p>
* @param option - option code to be looked up.
***/
boolean _stateIsDont(int option)
{
return !_stateIsDo(option);
}
/***
* Looks for the state of the option.
* <p>
* @return returns true if a will has been reuqested
* <p>
* @param option - option code to be looked up.
***/
boolean _requestedWill(int option)
{
return ((_options[option] & _REQUESTED_WILL_MASK) != 0);
}
/***
* Looks for the state of the option.
* <p>
* @return returns true if a wont has been reuqested
* <p>
* @param option - option code to be looked up.
***/
boolean _requestedWont(int option)
{
return !_requestedWill(option);
}
/***
* Looks for the state of the option.
* <p>
* @return returns true if a do has been reuqested
* <p>
* @param option - option code to be looked up.
***/
boolean _requestedDo(int option)
{
return ((_options[option] & _REQUESTED_DO_MASK) != 0);
}
/***
* Looks for the state of the option.
* <p>
* @return returns true if a dont has been reuqested
* <p>
* @param option - option code to be looked up.
***/
boolean _requestedDont(int option)
{
return !_requestedDo(option);
}
/***
* Sets the state of the option.
* <p>
* @param option - option code to be set.
***/
void _setWill(int option)
{
_options[option] |= _WILL_MASK;
/* open TelnetOptionHandler functionality (start)*/
if (_requestedWill(option))
{
if (optionHandlers[option] != null)
{
optionHandlers[option].setWill(true);
int subneg[] =
optionHandlers[option].startSubnegotiationLocal();
if (subneg != null)
{
try
{
_sendSubnegotiation(subneg);
}
catch (IOException e)
{
System.err.println(
"Exception in option subnegotiation"
+ e.getMessage());
}
}
}
}
/* open TelnetOptionHandler functionality (end)*/
}
/***
* Sets the state of the option.
* <p>
* @param option - option code to be set.
***/
void _setDo(int option)
{
_options[option] |= _DO_MASK;
/* open TelnetOptionHandler functionality (start)*/
if (_requestedDo(option))
{
if (optionHandlers[option] != null)
{
optionHandlers[option].setDo(true);
int subneg[] =
optionHandlers[option].startSubnegotiationRemote();
if (subneg != null)
{
try
{
_sendSubnegotiation(subneg);
}
catch (IOException e)
{
System.err.println("Exception in option subnegotiation"
+ e.getMessage());
}
}
}
}
/* open TelnetOptionHandler functionality (end)*/
}
/***
* Sets the state of the option.
* <p>
* @param option - option code to be set.
***/
void _setWantWill(int option)
{
_options[option] |= _REQUESTED_WILL_MASK;
}
/***
* Sets the state of the option.
* <p>
* @param option - option code to be set.
***/
void _setWantDo(int option)
{
_options[option] |= _REQUESTED_DO_MASK;
}
/***
* Sets the state of the option.
* <p>
* @param option - option code to be set.
***/
void _setWont(int option)
{
_options[option] &= ~_WILL_MASK;
/* open TelnetOptionHandler functionality (start)*/
if (optionHandlers[option] != null)
{
optionHandlers[option].setWill(false);
}
/* open TelnetOptionHandler functionality (end)*/
}
/***
* Sets the state of the option.
* <p>
* @param option - option code to be set.
***/
void _setDont(int option)
{
_options[option] &= ~_DO_MASK;
/* open TelnetOptionHandler functionality (start)*/
if (optionHandlers[option] != null)
{
optionHandlers[option].setDo(false);
}
/* open TelnetOptionHandler functionality (end)*/
}
/***
* Sets the state of the option.
* <p>
* @param option - option code to be set.
***/
void _setWantWont(int option)
{
_options[option] &= ~_REQUESTED_WILL_MASK;
}
/***
* Sets the state of the option.
* <p>
* @param option - option code to be set.
***/
void _setWantDont(int option)
{
_options[option] &= ~_REQUESTED_DO_MASK;
}
/**
* Processes a DO request.
*
* @param option - option code to be set.
* @throws IOException - Exception in I/O.
**/
void _processDo(int option) throws IOException
{
if (debugoptions)
{
System.err.println("RECEIVED DO: "
+ TelnetOption.getOption(option));
}
if (__notifhand != null)
{
__notifhand.receivedNegotiation(
TelnetNotificationHandler.RECEIVED_DO,
option);
}
boolean acceptNewState = false;
/* open TelnetOptionHandler functionality (start)*/
if (optionHandlers[option] != null)
{
acceptNewState = optionHandlers[option].getAcceptLocal();
}
else
{
/* open TelnetOptionHandler functionality (end)*/
/* TERMINAL-TYPE option (start)*/
if (option == TERMINAL_TYPE)
{
if ((terminalType != null) && (terminalType.length() > 0))
{
acceptNewState = true;
}
}
/* TERMINAL-TYPE option (end)*/
/* open TelnetOptionHandler functionality (start)*/
}
/* open TelnetOptionHandler functionality (end)*/
if (_willResponse[option] > 0)
{
--_willResponse[option];
if (_willResponse[option] > 0 && _stateIsWill(option))
{
--_willResponse[option];
}
}
if (_willResponse[option] == 0)
{
if (_requestedWont(option))
{
switch (option)
{
default:
break;
}
if (acceptNewState)
{
_setWantWill(option);
_sendWill(option);
}
else
{
++_willResponse[option];
_sendWont(option);
}
}
else
{
// Other end has acknowledged option.
switch (option)
{
default:
break;
}
}
}
_setWill(option);
}
/**
* Processes a DONT request.
*
* @param option - option code to be set.
* @throws IOException - Exception in I/O.
**/
void _processDont(int option) throws IOException
{
if (debugoptions)
{
System.err.println("RECEIVED DONT: "
+ TelnetOption.getOption(option));
}
if (__notifhand != null)
{
__notifhand.receivedNegotiation(
TelnetNotificationHandler.RECEIVED_DONT,
option);
}
if (_willResponse[option] > 0)
{
--_willResponse[option];
if (_willResponse[option] > 0 && _stateIsWont(option))
{
--_willResponse[option];
}
}
if (_willResponse[option] == 0 && _requestedWill(option))
{
switch (option)
{
default:
break;
}
/* FIX for a BUG in the negotiation (start)*/
if ((_stateIsWill(option)) || (_requestedWill(option)))
{
_sendWont(option);
}
_setWantWont(option);
/* FIX for a BUG in the negotiation (end)*/
}
_setWont(option);
}
/**
* Processes a WILL request.
*
* @param option - option code to be set.
* @throws IOException - Exception in I/O.
**/
void _processWill(int option) throws IOException
{
if (debugoptions)
{
System.err.println("RECEIVED WILL: "
+ TelnetOption.getOption(option));
}
if (__notifhand != null)
{
__notifhand.receivedNegotiation(
TelnetNotificationHandler.RECEIVED_WILL,
option);
}
boolean acceptNewState = false;
/* open TelnetOptionHandler functionality (start)*/
if (optionHandlers[option] != null)
{
acceptNewState = optionHandlers[option].getAcceptRemote();
}
/* open TelnetOptionHandler functionality (end)*/
if (_doResponse[option] > 0)
{
--_doResponse[option];
if (_doResponse[option] > 0 && _stateIsDo(option))
{
--_doResponse[option];
}
}
if (_doResponse[option] == 0 && _requestedDont(option))
{
switch (option)
{
default:
break;
}
if (acceptNewState)
{
_setWantDo(option);
_sendDo(option);
}
else
{
++_doResponse[option];
_sendDont(option);
}
}
_setDo(option);
}
/**
* Processes a WONT request.
*
* @param option - option code to be set.
* @throws IOException - Exception in I/O.
**/
void _processWont(int option) throws IOException
{
if (debugoptions)
{
System.err.println("RECEIVED WONT: "
+ TelnetOption.getOption(option));
}
if (__notifhand != null)
{
__notifhand.receivedNegotiation(
TelnetNotificationHandler.RECEIVED_WONT,
option);
}
if (_doResponse[option] > 0)
{
--_doResponse[option];
if (_doResponse[option] > 0 && _stateIsDont(option))
{
--_doResponse[option];
}
}
if (_doResponse[option] == 0 && _requestedDo(option))
{
switch (option)
{
default:
break;
}
/* FIX for a BUG in the negotiation (start)*/
if ((_stateIsDo(option)) || (_requestedDo(option)))
{
_sendDont(option);
}
_setWantDont(option);
/* FIX for a BUG in the negotiation (end)*/
}
_setDont(option);
}
/* TERMINAL-TYPE option (start)*/
/**
* Processes a suboption negotiation.
*
* @param suboption - subnegotiation data received
* @param suboptionLength - length of data received
* @throws IOException - Exception in I/O.
**/
void _processSuboption(int suboption[], int suboptionLength)
throws IOException
{
if (debug)
{
System.err.println("PROCESS SUBOPTION.");
}
/* open TelnetOptionHandler functionality (start)*/
if (suboptionLength > 0)
{
if (optionHandlers[suboption[0]] != null)
{
int responseSuboption[] =
optionHandlers[suboption[0]].answerSubnegotiation(suboption,
suboptionLength);
_sendSubnegotiation(responseSuboption);
}
else
{
if (suboptionLength > 1)
{
if (debug)
{
for (int ii = 0; ii < suboptionLength; ii++)
{
System.err.println("SUB[" + ii + "]: "
+ suboption[ii]);
}
}
if ((suboption[0] == TERMINAL_TYPE)
&& (suboption[1] == TERMINAL_TYPE_SEND))
{
_sendTerminalType();
}
}
}
}
/* open TelnetOptionHandler functionality (end)*/
}
/***
* Sends terminal type information.
* <p>
* @throws IOException - Exception in I/O.
***/
final synchronized void _sendTerminalType()
throws IOException
{
if (debug)
{
System.err.println("SEND TERMINAL-TYPE: " + terminalType);
}
if (terminalType != null)
{
_output_.write(_COMMAND_SB);
_output_.write(_COMMAND_IS);
_output_.write(terminalType.getBytes());
_output_.write(_COMMAND_SE);
_output_.flush();
}
}
/* TERMINAL-TYPE option (end)*/
/* open TelnetOptionHandler functionality (start)*/
/**
* Manages subnegotiation for Terminal Type.
*
* @param subn - subnegotiation data to be sent
* @throws IOException - Exception in I/O.
**/
final synchronized void _sendSubnegotiation(int subn[])
throws IOException
{
if (debug)
{
System.err.println("SEND SUBNEGOTIATION: ");
if (subn != null)
{
for (int ii = 0; ii < subn.length; ii++)
{
System.err.println("subn[" + ii + "]=" + subn[ii]);
}
}
}
if (subn != null)
{
byte byteresp[] = new byte[subn.length];
for (int ii = 0; ii < subn.length; ii++)
{
byteresp[ii] = (byte) subn[ii];
}
_output_.write(_COMMAND_SB);
_output_.write(byteresp);
_output_.write(_COMMAND_SE);
/* Code Section added for sending the negotiation ASAP (start)*/
_output_.flush();
/* Code Section added for sending the negotiation ASAP (end)*/
}
}
/* open TelnetOptionHandler functionality (end)*/
/* Code Section added for supporting AYT (start)*/
/***
* Processes the response of an AYT
***/
final synchronized void _processAYTResponse()
{
if (!aytFlag)
{
synchronized (aytMonitor)
{
aytFlag = true;
try
{
aytMonitor.notifyAll();
}
catch (IllegalMonitorStateException e)
{
System.err.println("Exception notifying:" + e.getMessage());
}
}
}
}
/* Code Section added for supporting AYT (end)*/
/***
* Called upon connection.
* <p>
* @throws IOException - Exception in I/O.
***/
@Override
protected void _connectAction_() throws IOException
{
/* (start). BUGFIX: clean the option info for each connection*/
for (int ii = 0; ii < TelnetOption.MAX_OPTION_VALUE + 1; ii++)
{
_doResponse[ii] = 0;
_willResponse[ii] = 0;
_options[ii] = 0;
if (optionHandlers[ii] != null)
{
optionHandlers[ii].setDo(false);
optionHandlers[ii].setWill(false);
}
}
/* (end). BUGFIX: clean the option info for each connection*/
super._connectAction_();
_input_ = new BufferedInputStream(_input_);
_output_ = new BufferedOutputStream(_output_);
/* open TelnetOptionHandler functionality (start)*/
for (int ii = 0; ii < TelnetOption.MAX_OPTION_VALUE + 1; ii++)
{
if (optionHandlers[ii] != null)
{
if (optionHandlers[ii].getInitLocal())
{
try
{
_requestWill(optionHandlers[ii].getOptionCode());
}
catch (IOException e)
{
System.err.println(
"Exception while initializing option: "
+ e.getMessage());
}
}
if (optionHandlers[ii].getInitRemote())
{
try
{
_requestDo(optionHandlers[ii].getOptionCode());
}
catch (IOException e)
{
System.err.println(
"Exception while initializing option: "
+ e.getMessage());
}
}
}
}
/* open TelnetOptionHandler functionality (end)*/
}
/**
* Sends a DO.
*
* @param option - Option code.
* @throws IOException - Exception in I/O.
**/
final synchronized void _sendDo(int option)
throws IOException
{
if (debug || debugoptions)
{
System.err.println("DO: " + TelnetOption.getOption(option));
}
_output_.write(_COMMAND_DO);
_output_.write(option);
/* Code Section added for sending the negotiation ASAP (start)*/
_output_.flush();
/* Code Section added for sending the negotiation ASAP (end)*/
}
/**
* Requests a DO.
*
* @param option - Option code.
* @throws IOException - Exception in I/O.
**/
final synchronized void _requestDo(int option)
throws IOException
{
if ((_doResponse[option] == 0 && _stateIsDo(option))
|| _requestedDo(option))
{
return ;
}
_setWantDo(option);
++_doResponse[option];
_sendDo(option);
}
/**
* Sends a DONT.
*
* @param option - Option code.
* @throws IOException - Exception in I/O.
**/
final synchronized void _sendDont(int option)
throws IOException
{
if (debug || debugoptions)
{
System.err.println("DONT: " + TelnetOption.getOption(option));
}
_output_.write(_COMMAND_DONT);
_output_.write(option);
/* Code Section added for sending the negotiation ASAP (start)*/
_output_.flush();
/* Code Section added for sending the negotiation ASAP (end)*/
}
/**
* Requests a DONT.
*
* @param option - Option code.
* @throws IOException - Exception in I/O.
**/
final synchronized void _requestDont(int option)
throws IOException
{
if ((_doResponse[option] == 0 && _stateIsDont(option))
|| _requestedDont(option))
{
return ;
}
_setWantDont(option);
++_doResponse[option];
_sendDont(option);
}
/**
* Sends a WILL.
*
* @param option - Option code.
* @throws IOException - Exception in I/O.
**/
final synchronized void _sendWill(int option)
throws IOException
{
if (debug || debugoptions)
{
System.err.println("WILL: " + TelnetOption.getOption(option));
}
_output_.write(_COMMAND_WILL);
_output_.write(option);
/* Code Section added for sending the negotiation ASAP (start)*/
_output_.flush();
/* Code Section added for sending the negotiation ASAP (end)*/
}
/**
* Requests a WILL.
*
* @param option - Option code.
* @throws IOException - Exception in I/O.
**/
final synchronized void _requestWill(int option)
throws IOException
{
if ((_willResponse[option] == 0 && _stateIsWill(option))
|| _requestedWill(option))
{
return ;
}
_setWantWill(option);
++_doResponse[option];
_sendWill(option);
}
/**
* Sends a WONT.
*
* @param option - Option code.
* @throws IOException - Exception in I/O.
**/
final synchronized void _sendWont(int option)
throws IOException
{
if (debug || debugoptions)
{
System.err.println("WONT: " + TelnetOption.getOption(option));
}
_output_.write(_COMMAND_WONT);
_output_.write(option);
/* Code Section added for sending the negotiation ASAP (start)*/
_output_.flush();
/* Code Section added for sending the negotiation ASAP (end)*/
}
/**
* Requests a WONT.
*
* @param option - Option code.
* @throws IOException - Exception in I/O.
**/
final synchronized void _requestWont(int option)
throws IOException
{
if ((_willResponse[option] == 0 && _stateIsWont(option))
|| _requestedWont(option))
{
return ;
}
_setWantWont(option);
++_doResponse[option];
_sendWont(option);
}
/**
* Sends a byte.
*
* @param b - byte to send
* @throws IOException - Exception in I/O.
**/
final synchronized void _sendByte(int b)
throws IOException
{
_output_.write(b);
/* Code Section added for supporting spystreams (start)*/
_spyWrite(b);
/* Code Section added for supporting spystreams (end)*/
}
/* Code Section added for supporting AYT (start)*/
/**
* Sends an Are You There sequence and waits for the result.
*
* @param timeout - Time to wait for a response (millis.)
* @throws IOException - Exception in I/O.
* @throws IllegalArgumentException - Illegal argument
* @throws InterruptedException - Interrupted during wait.
* @return true if AYT received a response, false otherwise
**/
final boolean _sendAYT(long timeout)
throws IOException, IllegalArgumentException, InterruptedException
{
boolean retValue = false;
synchronized (aytMonitor)
{
synchronized (this)
{
aytFlag = false;
_output_.write(_COMMAND_AYT);
_output_.flush();
}
try
{
aytMonitor.wait(timeout);
if (aytFlag == false)
{
retValue = false;
aytFlag = true;
}
else
{
retValue = true;
}
}
catch (IllegalMonitorStateException e)
{
System.err.println("Exception processing AYT:"
+ e.getMessage());
}
}
return (retValue);
}
/* Code Section added for supporting AYT (end)*/
/* open TelnetOptionHandler functionality (start)*/
/**
* Registers a new TelnetOptionHandler for this telnet to use.
*
* @param opthand - option handler to be registered.
* @throws InvalidTelnetOptionException - The option code is invalid.
**/
void addOptionHandler(TelnetOptionHandler opthand)
throws InvalidTelnetOptionException
{
int optcode = opthand.getOptionCode();
if (TelnetOption.isValidOption(optcode))
{
if (optionHandlers[optcode] == null)
{
optionHandlers[optcode] = opthand;
if (isConnected())
{
if (opthand.getInitLocal())
{
try
{
_requestWill(optcode);
}
catch (IOException e)
{
System.err.println(
"Exception while initializing option: "
+ e.getMessage());
}
}
if (opthand.getInitRemote())
{
try
{
_requestDo(optcode);
}
catch (IOException e)
{
System.err.println(
"Exception while initializing option: "
+ e.getMessage());
}
}
}
}
else
{
throw (new InvalidTelnetOptionException(
"Already registered option", optcode));
}
}
else
{
throw (new InvalidTelnetOptionException(
"Invalid Option Code", optcode));
}
}
/**
* Unregisters a TelnetOptionHandler.
*
* @param optcode - Code of the option to be unregistered.
* @throws InvalidTelnetOptionException - The option code is invalid.
**/
void deleteOptionHandler(int optcode)
throws InvalidTelnetOptionException
{
if (TelnetOption.isValidOption(optcode))
{
if (optionHandlers[optcode] == null)
{
throw (new InvalidTelnetOptionException(
"Unregistered option", optcode));
}
else
{
TelnetOptionHandler opthand = optionHandlers[optcode];
optionHandlers[optcode] = null;
if (opthand.getWill())
{
try
{
_requestWont(optcode);
}
catch (IOException e)
{
System.err.println(
"Exception while turning off option: "
+ e.getMessage());
}
}
if (opthand.getDo())
{
try
{
_requestDont(optcode);
}
catch (IOException e)
{
System.err.println(
"Exception while turning off option: "
+ e.getMessage());
}
}
}
}
else
{
throw (new InvalidTelnetOptionException(
"Invalid Option Code", optcode));
}
}
/* open TelnetOptionHandler functionality (end)*/
/* Code Section added for supporting spystreams (start)*/
/***
* Registers an OutputStream for spying what's going on in
* the Telnet session.
* <p>
* @param spystream - OutputStream on which session activity
* will be echoed.
***/
void _registerSpyStream(OutputStream spystream)
{
spyStream = spystream;
}
/***
* Stops spying this Telnet.
* <p>
***/
void _stopSpyStream()
{
spyStream = null;
}
/***
* Sends a read char on the spy stream.
* <p>
* @param ch - character read from the session
***/
void _spyRead(int ch)
{
if (spyStream != null)
{
try
{
if (ch != '\r')
{
spyStream.write(ch);
if (ch == '\n')
{
spyStream.write('\r');
}
spyStream.flush();
}
}
catch (IOException e)
{
spyStream = null;
}
}
}
/***
* Sends a written char on the spy stream.
* <p>
* @param ch - character written to the session
***/
void _spyWrite(int ch)
{
if (!(_stateIsDo(TelnetOption.ECHO)
&& _requestedDo(TelnetOption.ECHO)))
{
if (spyStream != null)
{
try
{
spyStream.write(ch);
spyStream.flush();
}
catch (IOException e)
{
spyStream = null;
}
}
}
}
/* Code Section added for supporting spystreams (end)*/
/***
* Registers a notification handler to which will be sent
* notifications of received telnet option negotiation commands.
* <p>
* @param notifhand - TelnetNotificationHandler to be registered
***/
public void registerNotifHandler(TelnetNotificationHandler notifhand)
{
__notifhand = notifhand;
}
/***
* Unregisters the current notification handler.
* <p>
***/
public void unregisterNotifHandler()
{
__notifhand = null;
}
}