Example of use of Telnet Client
/*
* 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 examples;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import org.apache.commons.net.telnet.TelnetClient;
import org.apache.commons.net.telnet.TelnetNotificationHandler;
import org.apache.commons.net.telnet.SimpleOptionHandler;
import org.apache.commons.net.telnet.EchoOptionHandler;
import org.apache.commons.net.telnet.TerminalTypeOptionHandler;
import org.apache.commons.net.telnet.SuppressGAOptionHandler;
import org.apache.commons.net.telnet.InvalidTelnetOptionException;
import java.util.StringTokenizer;
/***
* This is a simple example of use of TelnetClient.
* An external option handler (SimpleTelnetOptionHandler) is used.
* Initial configuration requested by TelnetClient will be:
* WILL ECHO, WILL SUPPRESS-GA, DO SUPPRESS-GA.
* VT100 terminal type will be subnegotiated.
* <p>
* Also, use of the sendAYT(), getLocalOptionState(), getRemoteOptionState()
* is demonstrated.
* When connected, type AYT to send an AYT command to the server and see
* the result.
* Type OPT to see a report of the state of the first 25 options.
* <p>
* @author Bruno D'Avanzo
***/
public class TelnetClientExample implements Runnable, TelnetNotificationHandler
{
static TelnetClient tc = null;
/***
* Main for the TelnetClientExample.
***/
public static void main(String[] args) throws IOException
{
FileOutputStream fout = null;
if(args.length < 1)
{
System.err.println("Usage: TelnetClientExample1 <remote-ip> [<remote-port>]");
System.exit(1);
}
String remoteip = args[0];
int remoteport;
if (args.length > 1)
{
remoteport = (new Integer(args[1])).intValue();
}
else
{
remoteport = 23;
}
try
{
fout = new FileOutputStream ("spy.log", true);
}
catch (Exception e)
{
System.err.println(
"Exception while opening the spy file: "
+ e.getMessage());
}
tc = new TelnetClient();
TerminalTypeOptionHandler ttopt = new TerminalTypeOptionHandler("VT100", false, false, true, false);
EchoOptionHandler echoopt = new EchoOptionHandler(true, false, true, false);
SuppressGAOptionHandler gaopt = new SuppressGAOptionHandler(true, true, true, true);
try
{
tc.addOptionHandler(ttopt);
tc.addOptionHandler(echoopt);
tc.addOptionHandler(gaopt);
}
catch (InvalidTelnetOptionException e)
{
System.err.println("Error registering option handlers: " + e.getMessage());
}
while (true)
{
boolean end_loop = false;
try
{
tc.connect(remoteip, remoteport);
Thread reader = new Thread (new TelnetClientExample());
tc.registerNotifHandler(new TelnetClientExample());
System.out.println("TelnetClientExample");
System.out.println("Type AYT to send an AYT telnet command");
System.out.println("Type OPT to print a report of status of options (0-24)");
System.out.println("Type REGISTER to register a new SimpleOptionHandler");
System.out.println("Type UNREGISTER to unregister an OptionHandler");
System.out.println("Type SPY to register the spy (connect to port 3333 to spy)");
System.out.println("Type UNSPY to stop spying the connection");
reader.start();
OutputStream outstr = tc.getOutputStream();
byte[] buff = new byte[1024];
int ret_read = 0;
do
{
try
{
ret_read = System.in.read(buff);
if(ret_read > 0)
{
if((new String(buff, 0, ret_read)).startsWith("AYT"))
{
try
{
System.out.println("Sending AYT");
System.out.println("AYT response:" + tc.sendAYT(5000));
}
catch (Exception e)
{
System.err.println("Exception waiting AYT response: " + e.getMessage());
}
}
else if((new String(buff, 0, ret_read)).startsWith("OPT"))
{
System.out.println("Status of options:");
for(int ii=0; ii<25; ii++)
System.out.println("Local Option " + ii + ":" + tc.getLocalOptionState(ii) + " Remote Option " + ii + ":" + tc.getRemoteOptionState(ii));
}
else if((new String(buff, 0, ret_read)).startsWith("REGISTER"))
{
StringTokenizer st = new StringTokenizer(new String(buff));
try
{
st.nextToken();
int opcode = (new Integer(st.nextToken())).intValue();
boolean initlocal = (new Boolean(st.nextToken())).booleanValue();
boolean initremote = (new Boolean(st.nextToken())).booleanValue();
boolean acceptlocal = (new Boolean(st.nextToken())).booleanValue();
boolean acceptremote = (new Boolean(st.nextToken())).booleanValue();
SimpleOptionHandler opthand = new SimpleOptionHandler(opcode, initlocal, initremote,
acceptlocal, acceptremote);
tc.addOptionHandler(opthand);
}
catch (Exception e)
{
if(e instanceof InvalidTelnetOptionException)
{
System.err.println("Error registering option: " + e.getMessage());
}
else
{
System.err.println("Invalid REGISTER command.");
System.err.println("Use REGISTER optcode initlocal initremote acceptlocal acceptremote");
System.err.println("(optcode is an integer.)");
System.err.println("(initlocal, initremote, acceptlocal, acceptremote are boolean)");
}
}
}
else if((new String(buff, 0, ret_read)).startsWith("UNREGISTER"))
{
StringTokenizer st = new StringTokenizer(new String(buff));
try
{
st.nextToken();
int opcode = (new Integer(st.nextToken())).intValue();
tc.deleteOptionHandler(opcode);
}
catch (Exception e)
{
if(e instanceof InvalidTelnetOptionException)
{
System.err.println("Error unregistering option: " + e.getMessage());
}
else
{
System.err.println("Invalid UNREGISTER command.");
System.err.println("Use UNREGISTER optcode");
System.err.println("(optcode is an integer)");
}
}
}
else if((new String(buff, 0, ret_read)).startsWith("SPY"))
{
try
{
tc.registerSpyStream(fout);
}
catch (Exception e)
{
System.err.println("Error registering the spy");
}
}
else if((new String(buff, 0, ret_read)).startsWith("UNSPY"))
{
tc.stopSpyStream();
}
else
{
try
{
outstr.write(buff, 0 , ret_read);
outstr.flush();
}
catch (Exception e)
{
end_loop = true;
}
}
}
}
catch (Exception e)
{
System.err.println("Exception while reading keyboard:" + e.getMessage());
end_loop = true;
}
}
while((ret_read > 0) && (end_loop == false));
try
{
tc.disconnect();
}
catch (Exception e)
{
System.err.println("Exception while connecting:" + e.getMessage());
}
}
catch (Exception e)
{
System.err.println("Exception while connecting:" + e.getMessage());
System.exit(1);
}
}
}
/***
* Callback method called when TelnetClient receives an option
* negotiation command.
* <p>
* @param negotiation_code - type of negotiation command received
* (RECEIVED_DO, RECEIVED_DONT, RECEIVED_WILL, RECEIVED_WONT)
* <p>
* @param option_code - code of the option negotiated
* <p>
***/
public void receivedNegotiation(int negotiation_code, int option_code)
{
String command = null;
if(negotiation_code == TelnetNotificationHandler.RECEIVED_DO)
{
command = "DO";
}
else if(negotiation_code == TelnetNotificationHandler.RECEIVED_DONT)
{
command = "DONT";
}
else if(negotiation_code == TelnetNotificationHandler.RECEIVED_WILL)
{
command = "WILL";
}
else if(negotiation_code == TelnetNotificationHandler.RECEIVED_WONT)
{
command = "WONT";
}
System.out.println("Received " + command + " for option code " + option_code);
}
/***
* Reader thread.
* Reads lines from the TelnetClient and echoes them
* on the screen.
***/
public void run()
{
InputStream instr = tc.getInputStream();
try
{
byte[] buff = new byte[1024];
int ret_read = 0;
do
{
ret_read = instr.read(buff);
if(ret_read > 0)
{
System.out.print(new String(buff, 0, ret_read));
}
}
while (ret_read >= 0);
}
catch (Exception e)
{
System.err.println("Exception while reading socket:" + e.getMessage());
}
try
{
tc.disconnect();
}
catch (Exception e)
{
System.err.println("Exception while closing telnet:" + e.getMessage());
}
}
}
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