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The source code

/*
 * Copyright 2003-2004 The Apache Software Foundation
 *
 * Licensed 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.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.commons.net.io.FromNetASCIIInputStream;
import org.apache.commons.net.io.ToNetASCIIOutputStream;

/***
 * The TelnetClient class implements the simple network virtual
 * terminal (NVT) for the Telnet protocol according to RFC 854.  It
 * does not implement any of the extra Telnet options because it
 * is meant to be used within a Java program providing automated
 * access to Telnet accessible resources.
 * 

* The class can be used by first connecting to a server using the * SocketClient * connect * method. Then an InputStream and OutputStream for sending and * receiving data over the Telnet connection can be obtained by * using the getInputStream() and * getOutputStream() methods. * When you finish using the streams, you must call * disconnect rather than simply * closing the streams. *

*

* @author Daniel F. Savarese * @author Bruno D'Avanzo ***/ public class TelnetClient extends Telnet { private InputStream __input; private OutputStream __output; protected boolean readerThread = true; /*** * Default TelnetClient constructor. ***/ public TelnetClient() { /* TERMINAL-TYPE option (start)*/ super ("VT100"); /* TERMINAL-TYPE option (end)*/ __input = null; __output = null; } /* TERMINAL-TYPE option (start)*/ public TelnetClient(String termtype) { super (termtype); __input = null; __output = null; } /* TERMINAL-TYPE option (end)*/ void _flushOutputStream() throws IOException { _output_.flush(); } void _closeOutputStream() throws IOException { _output_.close(); } /*** * Handles special connection requirements. *

* @exception IOException If an error occurs during connection setup. ***/ protected void _connectAction_() throws IOException { super._connectAction_(); InputStream input; TelnetInputStream tmp; if (FromNetASCIIInputStream.isConversionRequired()) input = new FromNetASCIIInputStream(_input_); else input = _input_; tmp = new TelnetInputStream(input, this); if(readerThread) { tmp._start(); } // __input CANNOT refer to the TelnetInputStream. We run into // blocking problems when some classes use TelnetInputStream, so // we wrap it with a BufferedInputStream which we know is safe. // This blocking behavior requires further investigation, but right // now it looks like classes like InputStreamReader are not implemented // in a safe manner. __input = new BufferedInputStream(tmp); __output = new ToNetASCIIOutputStream(new TelnetOutputStream(this)); } /*** * Disconnects the telnet session, closing the input and output streams * as well as the socket. If you have references to the * input and output streams of the telnet connection, you should not * close them yourself, but rather call disconnect to properly close * the connection. ***/ public void disconnect() throws IOException { __input.close(); __output.close(); super.disconnect(); } /*** * Returns the telnet connection output stream. You should not close the * stream when you finish with it. Rather, you should call * disconnect . *

* @return The telnet connection output stream. ***/ public OutputStream getOutputStream() { return __output; } /*** * Returns the telnet connection input stream. You should not close the * stream when you finish with it. Rather, you should call * disconnect . *

* @return The telnet connection input stream. ***/ public InputStream getInputStream() { return __input; } /*** * Returns the state of the option on the local side. *

* @param option - Option to be checked. *

* @return The state of the option on the local side. ***/ public boolean getLocalOptionState(int option) { /* BUG (option active when not already acknowledged) (start)*/ return (_stateIsWill(option) && _requestedWill(option)); /* BUG (option active when not already acknowledged) (end)*/ } /*** * Returns the state of the option on the remote side. *

* @param option - Option to be checked. *

* @return The state of the option on the remote side. ***/ public boolean getRemoteOptionState(int option) { /* BUG (option active when not already acknowledged) (start)*/ return (_stateIsDo(option) && _requestedDo(option)); /* BUG (option active when not already acknowledged) (end)*/ } /* open TelnetOptionHandler functionality (end)*/ /* Code Section added for supporting AYT (start)*/ /*** * Sends an Are You There sequence and waits for the result. *

* @throws InterruptedException * @throws IllegalArgumentException * @throws IOException *

* @param timeout - Time to wait for a response (millis.) *

* @return true if AYT received a response, false otherwise ***/ public boolean sendAYT(long timeout) throws IOException, IllegalArgumentException, InterruptedException { return (_sendAYT(timeout)); } /* Code Section added for supporting AYT (start)*/ /* open TelnetOptionHandler functionality (start)*/ /*** * Registers a new TelnetOptionHandler for this telnet client to use. *

* @throws InvalidTelnetOptionException *

* @param opthand - option handler to be registered. ***/ public void addOptionHandler(TelnetOptionHandler opthand) throws InvalidTelnetOptionException { super.addOptionHandler(opthand); } /* open TelnetOptionHandler functionality (end)*/ /*** * Unregisters a TelnetOptionHandler. *

* @throws InvalidTelnetOptionException *

* @param optcode - Code of the option to be unregistered. ***/ public void deleteOptionHandler(int optcode) throws InvalidTelnetOptionException { super.deleteOptionHandler(optcode); } /* Code Section added for supporting spystreams (start)*/ /*** * Registers an OutputStream for spying what's going on in * the TelnetClient session. *

* @param spystream - OutputStream on which session activity * will be echoed. ***/ public void registerSpyStream(OutputStream spystream) { super._registerSpyStream(spystream); } /*** * Stops spying this TelnetClient. *

***/ public void stopSpyStream() { super._stopSpyStream(); } /* Code Section added for supporting spystreams (end)*/ /*** * Registers a notification handler to which will be sent * notifications of received telnet option negotiation commands. *

* @param notifhand - TelnetNotificationHandler to be registered ***/ public void registerNotifHandler(TelnetNotificationHandler notifhand) { super.registerNotifHandler(notifhand); } /*** * Unregisters the current notification handler. *

***/ public void unregisterNotifHandler() { super.unregisterNotifHandler(); } /*** * Sets the status of the reader thread. * The reader thread status will apply to all subsequent connections *

* @param flag - true switches the reader thread on, false switches it off ***/ public void setReaderThread(boolean flag) { readerThread = flag; } /*** * Gets the status of the reader thread. *

* @return true if the reader thread is on, false otherwise ***/ public boolean getReaderThread() { return (readerThread); } }

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