//
// 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 May 05: Switch from SocketChannel to Socket with connection timeout.
// 2003 Jul 21: Explicitly closed socket.
// 2003 Jul 18: Enabled retries for monitors.
// 2003 Jun 11: Added a "catch" for RRD update errors. Bug #748.
// 2003 Jan 31: Added the ability to imbed RRA information in poller packages.
// 2003 Jan 31: Cleaned up some unused imports.
// 2003 Jan 29: Added response times to certain monitors.
// 2002 Nov 14: Used non-blocking I/O socket channel classes.
//
// 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 <license@opennms.org>
// http://www.opennms.org/
// http://www.opennms.com/
//
// Tab Size = 8
//
package org.infosec.ismp.poller.monitor;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.InterruptedIOException;
import java.net.ConnectException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.NoRouteToHostException;
import java.net.Socket;
import java.util.Map;
import org.apache.log4j.Level;
import org.infosec.ismp.model.poller.MonitoredService;
import org.infosec.ismp.model.poller.NetworkInterface;
import org.infosec.ismp.model.poller.NetworkInterfaceNotSupportedException;
import org.infosec.ismp.model.poller.PollStatus;
import org.infosec.ismp.model.poller.monitors.IPv4Monitor;
import org.infosec.ismp.util.ParameterMap;
import org.infosec.ismp.util.ThreadCategory;
import org.infosec.ismp.util.TimeoutTracker;
/**
* <P>
* This class is designed to be used by the service poller framework to test the
* availability of the IMAP service on remote interfaces. The class implements
* the ServiceMonitor interface that allows it to be used along with other
* plug-ins by the service poller framework.
* </P>
*
* @author <A HREF="mailto:tarus@opennms.org">Tarus Balog </A>
* @author <A HREF="mailto:sowmya@opennms.org">Sowmya Nataraj </A>
* @author <A HREF="mailto:mike@opennms.org">Mike Davidson </A>
* @author <A HREF="http://www.opennms.org/">OpenNMS </A>
*
* @version CVS 1.1.1.1
*
*/
final public class ImapMonitor extends IPv4Monitor {
/**
* Default IMAP port.
*/
private static final int DEFAULT_PORT = 143;
/**
* Default retries.
*/
private static final int DEFAULT_RETRY = 0;
/**
* Default timeout. Specifies how long (in milliseconds) to block waiting
* for data from the monitored interface.
*/
private static final int DEFAULT_TIMEOUT = 3000;
/**
* The start of the initial banner received from the server
*/
private static String IMAP_START_RESPONSE_PREFIX = "* OK ";
/**
* The LOGOUT request sent to the server to close the connection
*/
private static String IMAP_LOGOUT_REQUEST = "ONMSPOLLER LOGOUT\r\n";
/**
* The BYE response received from the server in response to the logout
*/
private static String IMAP_BYE_RESPONSE_PREFIX = "* BYE ";
/**
* The LOGOUT response received from the server in response to the logout
*/
private static String IMAP_LOGOUT_RESPONSE_PREFIX = "ONMSPOLLER OK ";
/**
* <P>
* Poll the specified address for IMAP service availability.
* </P>
*
* <P>
* During the poll an attempt is made to connect on the specified port (by
* default TCP port 143). If the connection request is successful, the
* banner line generated by the interface is parsed and if it starts with a '*
* OK , it indicates that we are talking to an IMAP server and we continue.
* Next, a 'LOGOUT' command is sent to the interface. Again the response is
* parsed and the response is verified to see that we get a '* OK'. If the
* interface's response is valid we set the service status to
* SERVICE_AVAILABLE and return.
* </P>
* @param parameters
* The package parameters (timeout, retry, etc...) to be used for
* this poll.
* @param iface
* The network interface to test the service on.
* @return The availibility of the interface and if a transition event
* should be supressed.
*
*/
public PollStatus poll(MonitoredService svc, Map<String, Object> parameters) {
NetworkInterface iface = svc.getNetInterface();
// Get interface address from NetworkInterface
//
if (iface.getType() != NetworkInterface.TYPE_IPV4)
throw new NetworkInterfaceNotSupportedException("Unsupported interface type, only TYPE_IPV4 currently supported");
// Process parameters
//
ThreadCategory log = ThreadCategory.getInstance(getClass());
TimeoutTracker tracker = new TimeoutTracker(parameters, DEFAULT_RETRY, DEFAULT_TIMEOUT);
// Retries
//
int port = ParameterMap.getKeyedInteger(parameters, "port", DEFAULT_PORT);
// Get interface address from NetworkInterface
//
InetAddress ipv4Addr = (InetAddress) iface.getAddress();
if (log.isDebugEnabled())
log.debug("ImapMonitor.poll: address: " + ipv4Addr + " port: " + port + tracker);
PollStatus serviceStatus = PollStatus.unavailable();
for (tracker.reset(); tracker.shouldRetry() && !serviceStatus.isAvailable(); tracker.nextAttempt()) {
Socket socket = null;
try {
//
// create a connected socket
//
tracker.startAttempt();
socket = new Socket();
socket.connect(new InetSocketAddress(ipv4Addr, port), tracker.getConnectionTimeout());
socket.setSoTimeout(tracker.getSoTimeout());
// We're connected, so upgrade status to unresponsive
serviceStatus = PollStatus.unresponsive();
BufferedReader rdr = new BufferedReader(new InputStreamReader(socket.getInputStream()));
//
// Tokenize the Banner Line, and check the first
// line for a valid return.
//
String banner = rdr.readLine();
double responseTime = tracker.elapsedTimeInMillis();
if (log.isDebugEnabled())
log.debug("ImapMonitor.Poll(): banner: " + banner);
if (banner != null && banner.startsWith(IMAP_START_RESPONSE_PREFIX)) {
//
// Send the LOGOUT
//
socket.getOutputStream().write(IMAP_LOGOUT_REQUEST.getBytes());
//
// get the returned string, tokenize, and
// verify the correct output.
//
String response = rdr.readLine();
if (response != null && response.startsWith(IMAP_BYE_RESPONSE_PREFIX)) {
response = rdr.readLine();
if (response != null && response.startsWith(IMAP_LOGOUT_RESPONSE_PREFIX)) {
serviceStatus = PollStatus.available(responseTime);
}
}
}
// If we get this far and the status has not been set
// to available, then something didn't verify during
// the banner checking or logout process.
if (!serviceStatus.isAvailable()) {
serviceStatus = PollStatus.unavailable();
}
} catch (NoRouteToHostException e) {
serviceStatus = logDown(Level.WARN,"No route to host exception for address: " + ipv4Addr, e);
} catch (ConnectException e) {
// Connection refused. Continue to retry.
serviceStatus = logDown(Level.DEBUG, "Connection exception for address: " + ipv4Addr, e);
} catch (InterruptedIOException e) {
serviceStatus = logDown(Level.DEBUG, "did not connect to host with " + tracker);
} catch (IOException e) {
serviceStatus = logDown(Level.DEBUG, "IOException while polling address: " + ipv4Addr, e);
} finally {
try {
// Close the socket
if (socket != null)
socket.close();
} catch (IOException e) {
e.fillInStackTrace();
log.debug("ImapMonitor.poll: Error closing socket.", e);
}
}
}
//
// return the status of the service
//
return serviceStatus;
}
}