citrixplugin.java

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//
// // // This file is part of the OpenNMS(R) Application.
//
// OpenNMS(R) is Copyright (C) 2002-2003 The OpenNMS Group, Inc. All
// rights reserved.
// OpenNMS(R) is a derivative work, containing both original code, included code
// and modified
// code that was published under the GNU General Public License. Copyrights for
// modified
// and included code are below.
//
// OpenNMS(R) is a registered trademark of The OpenNMS Group, Inc.
//
// Modifications:
//
// 2004 Apr 27: Extend AbstractTcpPlugin and move most function up to it
// 2003 Jul 18: Fixed exception to enable retries.
// 2003 Jan 31: Cleaned up some unused imports.
// 2002 Nov 14: Used non-blocking I/O for speed improvements.
//
// Original code base Copyright (C) 1999-2001 Oculan Corp. All rights reserved.
//
// This program 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 of the License, or
// (at your option) any later version.
//
// This program 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 program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//       
// For more information contact:
//      OpenNMS Licensing <[e-mail]>
//      http://www.opennms.org/
//      http://www.opennms.com/
//
// Tab Size = 8
//

package org.opennms.netmgt.capsd;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;

/**
 * <P>
 * This class is designed to be used by the capabilities daemon to test for the
 * existance of an Citrix server on remote interfaces. The class implements the
 * Plugin interface that allows it to be used along with other plugins by the
 * daemon.
 * </P>
 * 
 * @author <A HREF="mailto:[e-mail]">Jason </A>
 * @author <A HREF="http://www.opennsm.org">OpenNMS </A>
 * 
 * 
 */
public final class CitrixPlugin extends AbstractTcpPlugin {

    /**
     * <P>
     * The default port on which the host is checked to see if it supports
     * Citrix.
     * </P>
     */
    private static final int DEFAULT_PORT = 1494;

    /**
     * Default number of retries for Citrix requests.
     */
    private final static int DEFAULT_RETRY = 0;

    /**
     * Default timeout (in milliseconds) for Citrix requests.
     */
    private final static int DEFAULT_TIMEOUT = 5000; // in milliseconds

    /**
     * <P>
     * The capability name of the plugin.
     * </P>
     */
    private static final String PROTOCOL_NAME = "Citrix";

    /**
     */
    public CitrixPlugin() {
        super(PROTOCOL_NAME, DEFAULT_PORT, DEFAULT_TIMEOUT, DEFAULT_RETRY);
    }

    /**
     * @param socket
     * @param isAServer
     * @return
     * @throws IOException
     */
    protected boolean checkProtocol(Socket socket, ConnectionConfig config) throws IOException {
        boolean isAServer = false;
        // Allocate a line reader
        //
        BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        StringBuffer buffer = new StringBuffer();

        // FIXME: This doesn't seem right. This loops until an exception occurs.
        // Should at least check for EOF
        while (!isAServer) {
            buffer.append((char) reader.read());
            if (buffer.toString().indexOf("ICA") > -1) {
                isAServer = true;
            }
        }
        return isAServer;
    }
}