/* * This file is part of "The Java Telnet Application". * * This is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2, or (at your option) * any later version. * * "The Java Telnet Application" is distributed in the hope that it will be  * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. *  * You should have received a copy of the GNU General Public License * along with this software; see the file COPYING.  If not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */package de.mud.jta.plugin;import de.mud.jta.Plugin;import de.mud.jta.FilterPlugin;import de.mud.jta.PluginBus;import de.mud.jta.PluginConfig;import de.mud.jta.event.LocalEchoRequest;import de.mud.jta.event.SocketListener;import de.mud.jta.event.ConfigurationListener;import de.mud.jta.event.OnlineStatus;// import java.io.InputStream;// import java.io.OutputStream;import java.io.IOException;/** * The shell plugin is the backend component for terminal emulation using * a shell. It provides the i/o streams of the shell as data source. * <P> * <B>Maintainer:</B> Matthias L. Jugel * * @version $Id: Shell.java,v 2.4 2000/11/21 18:58:48 marcus Exp $ * @author Matthias L. Jugel, Marcus Mei遪er, Pete Zaitcev */public class Shell extends Plugin implements FilterPlugin {  protected String shellCommand;  private HandlerPTY pty;  public Shell(final PluginBus bus, final String id) {    super(bus, id);    bus.registerPluginListener(new ConfigurationListener() {      public void setConfiguration(PluginConfig cfg) {        String tmp;	if((tmp = cfg.getProperty("Shell", id, "command")) != null) {	  shellCommand = tmp;	  // System.out.println("Shell: Setting config " + tmp); // P3        } else {	  // System.out.println("Shell: Not setting config"); // P3	  shellCommand = "/bin/sh";        }      }    });    bus.registerPluginListener(new SocketListener() {      // we do actually ignore these parameters      public void connect(String host, int port) {        // XXX Fix this together with window size changes        // String ttype = (String)bus.broadcast(new TerminalTypeRequest());        // String ttype = getTerminalType();        // if(ttype == null) ttype = "dumb";	// XXX Add try around here to catch missing DLL/.so.	pty = new HandlerPTY();        if(pty.start(shellCommand) == 0) {	  bus.broadcast(new OnlineStatus(true));        } else {	  bus.broadcast(new OnlineStatus(false));        }      }      public void disconnect() {        bus.broadcast(new OnlineStatus(false));        pty = null;      }    });  }  public void setFilterSource(FilterPlugin plugin) {    // we do not have a source other than our socket  }  public int read(byte[] b) throws IOException {    if(pty == null) return 0;    int ret = pty.read(b);    if(ret <= 0) {      throw new IOException("EOF on PTY");    }    return ret;  }  public void write(byte[] b) throws IOException {    if(pty != null) pty.write(b);  }}