| SnmpAgentService.java |
/*
* Copyright (c) 2003, Intracom S.A. - www.intracom.com
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* This package and its source code is available at www.jboss.org
**/
package org.jboss.jmx.adaptor.snmp.agent;
import java.net.InetAddress;
import java.net.UnknownHostException;
import javax.management.Notification;
import javax.management.NotificationListener;
import javax.management.ObjectName;
import org.jboss.system.ListenerServiceMBeanSupport;
import org.jboss.system.server.ServerConfig;
import org.opennms.protocols.snmp.SnmpAgentSession;
import org.opennms.protocols.snmp.SnmpPeer;
import org.opennms.protocols.snmp.SnmpSMI;
/**
* <tt>SnmpAgentService</tt> is an MBean class implementing an SNMP agent.
*
* Currently, it allows to send V1 or V2 traps to one or more SNMP
* managers defined by their IP address, listening port number and expected
* SNMP version. It will hopefully grow into a full blown SNMP agent
* with get/set functionality.
*
* @jmx:mbean
* extends="org.jboss.system.ListenerServiceMBean"
*
* Revisions
* =========
* 27/02/04, Dimitris Andreadis
* got rid of subscription manager in favour of ListenerServiceMBeanSupport
*
* @version $Revision: 1.4.6.3 $
*
* @author <a href="mailto:spol@intracom.gr">Spyros Pollatos</a>
* @author <a href="mailto:dimitris@jboss.org">Dimitris Andreadis</a>
* @author <a href="mailto:krishnaraj@ieee.org">Krishnaraj S</a>
**/
public class SnmpAgentService
extends ListenerServiceMBeanSupport
implements NotificationListener, SnmpAgentServiceMBean
{
/** Supported versions */
public static final int SNMPV1 = 1;
public static final int SNMPV2 = 2;
/** Default communities */
public static final String DEFAULT_READ_COMMUNITY = "public";
public static final String DEFAULT_WRITE_COMMUNITY = "private";
// Private data --------------------------------------------------
/** Time keeping*/
private Clock clock = null;
/** Trap counter */
private Counter trapCounter = null;
/** Name of the file containing SNMP manager specifications */
private String managersResName = null;
/** Name of resource file containing notification to trap mappings */
private String notificationMapResName = null;
/** Name of resource file containing get/set mappings */
private String requestHandlerResName = null;
/** Name of the trap factory class to be utilised */
private String trapFactoryClassName = null;
/** Name of request handler implementation class */
private String requestHandlerClassName = null;
/** The SNMP read community to use */
private String readCommunity = DEFAULT_READ_COMMUNITY;
/** The SNMP write community to use */
private String writeCommunity = DEFAULT_WRITE_COMMUNITY;
/** Controls the request processing thread pool */
private int numberOfThreads = 1;
/** Agent listening port */
private int port = 1161;
/** Agent SNMP protocol version */
private int snmpVersion = SNMPV1;
/** The interface to bind, useful for multi-homed hosts */
private InetAddress bindAddress;
/** Name of the utilised timer MBean */
private ObjectName timerName = null;
/** Heartbeat emission period (in seconds) and switch */
private int heartBeatPeriod = 60;
/** Dynamic subscriptions flag */
private boolean dynamicSubscriptions = true;
/** Reference to heartbeat emission controller */
private Heartbeat heartbeat = null;
/** The trap emitting subsystem*/
private TrapEmitter trapEmitter = null;
/** the snmp agent session for handling get/set requests */
private SnmpAgentSession agentSession = null;
// Constructors --------------------------------------------------
/**
* Default CTOR
*/
public SnmpAgentService()
{
// empty
}
// Attributes ----------------------------------------------------
/**
* Gets the heartbeat switch
*
* @jmx:managed-attribute
**/
public int getHeartBeatPeriod()
{
return this.heartBeatPeriod;
}
/**
* Sets the heartbeat period (in seconds) switch
*
* @jmx:managed-attribute
**/
public void setHeartBeatPeriod(int heartBeatPeriod)
{
this.heartBeatPeriod = heartBeatPeriod;
}
/**
* Returns the difference, measured in milliseconds, between the
* instantiation time and midnight, January 1, 1970 UTC.
*
* @jmx:managed-attribute
**/
public long getInstantiationTime()
{
return this.clock.instantiationTime();
}
/**
* Returns the up-time
*
* @jmx:managed-attribute
**/
public long getUptime()
{
return this.clock.uptime();
}
/**
* Returns the current trap counter reading
*
* @jmx:managed-attribute
**/
public long getTrapCount()
{
return this.trapCounter.peek();
}
/**
* Sets the name of the file containing SNMP manager specifications
*
* @jmx:managed-attribute
**/
public void setManagersResName(String managersResName)
{
this.managersResName = managersResName;
}
/**
* Gets the name of the file containing SNMP manager specifications
*
* @jmx:managed-attribute
**/
public String getManagersResName()
{
return this.managersResName;
}
/**
* Sets the name of the file containing the notification/trap mappings
*
* @jmx:managed-attribute
**/
public void setNotificationMapResName(String notificationMapResName)
{
this.notificationMapResName = notificationMapResName;
}
/**
* Gets the name of the file containing the notification/trap mappings
*
* @jmx:managed-attribute
**/
public String getNotificationMapResName()
{
return this.notificationMapResName;
}
/**
* Sets the utilised trap factory name
*
* @jmx:managed-attribute
**/
public void setTrapFactoryClassName(String name)
{
this.trapFactoryClassName = name;
}
/**
* Gets the utilised trap factory name
*
* @jmx:managed-attribute
**/
public String getTrapFactoryClassName()
{
return this.trapFactoryClassName;
}
/**
* Sets the utilised timer MBean name
*
* @jmx:managed-attribute
**/
public void setTimerName(ObjectName timerName)
{
this.timerName = timerName;
}
/**
* Gets the utilised timer MBean name
*
* @jmx:managed-attribute
**/
public ObjectName getTimerName()
{
return this.timerName;
}
/**
* Sets the agent bind address
*
* @jmx:managed-attribute
*/
public void setBindAddress(String bindAddress)
throws UnknownHostException
{
this.bindAddress = toInetAddress(bindAddress);
}
/**
* Gets the agent bind address
*
* @jmx:managed-attribute
*/
public String getBindAddress()
{
String address = null;
if (this.bindAddress != null)
address = this.bindAddress.getHostAddress();
return address;
}
/**
* Sets the number of threads in the agent request processing thread pool
*
* @jmx:managed-attribute
*/
public void setNumberOfThreads(int numberOfThreads)
{
if (numberOfThreads > 0 && numberOfThreads <= 12)
{
this.numberOfThreads = numberOfThreads;
}
}
/**
* Gets the number of threads in the agent requests processing thread pool
*
* @jmx:managed-attribute
*/
public int getNumberOfThreads()
{
return numberOfThreads;
}
/**
* Sets the agent listening port number
*
* @jmx:managed-attribute
*/
public void setPort(int port)
{
if (port >= 0)
{
this.port = port;
}
}
/**
* Gets the agent listening port number
*
* @jmx:managed-attribute
*/
public int getPort()
{
return port;
}
/**
* Sets the snmp protocol version
*
* @jmx:managed-attribute
*/
public void setSnmpVersion(int snmpVersion)
{
switch (snmpVersion)
{
case SNMPV2:
this.snmpVersion = SNMPV2;
break;
default:
this.snmpVersion = SNMPV1;
break;
}
}
/**
* Gets the snmp protocol version
*
* @jmx:managed-attribute
*/
public int getSnmpVersion()
{
return snmpVersion;
}
/**
* Sets the read community (no getter)
*
* @jmx:managed-attribute
*/
public void setReadCommunity(String readCommunity)
{
if (readCommunity != null && readCommunity.length() > 0)
{
this.readCommunity = readCommunity;
}
}
/**
* Sets the write community (no getter)
* @jmx:managed-attribute
*/
public void setWriteCommunity(String writeCommunity)
{
if (writeCommunity != null && writeCommunity.length() > 0)
{
this.writeCommunity = writeCommunity;
}
}
/**
* Sets the RequestHandler implementation class
*
* @jmx:managed-attribute
*/
public void setRequestHandlerClassName(String requestHandlerClassName)
{
this.requestHandlerClassName = requestHandlerClassName;
}
/**
* Gets the RequestHandler implementation class
*
* @jmx:managed-attribute
*/
public String getRequestHandlerClassName()
{
return requestHandlerClassName;
}
/**
* Sets the resource file name containing get/set mappings
*
* @jmx:managed-attribute
*/
public void setRequestHandlerResName(String requestHandlerResName)
{
this.requestHandlerResName = requestHandlerResName;
}
/**
* Gets the resource file name containing get/set mappings
*
* @jmx:managed-attribute
*/
public String getRequestHandlerResName()
{
return requestHandlerResName;
}
/**
* Enables/disables dynamic subscriptions
*
* @jmx:managed-attribute
**/
public void setDynamicSubscriptions(boolean dynamicSubscriptions)
{
this.dynamicSubscriptions = dynamicSubscriptions;
}
/**
* Gets the dynamic subscriptions status
*
* @jmx:managed-attribute
**/
public boolean getDynamicSubscriptions()
{
return this.dynamicSubscriptions;
}
// Lifecycle operations ------------------------------------------
/**
* Perform service start-up
**/
protected void startService()
throws Exception
{
// initialize clock and trapCounter
this.clock = new Clock();
this.trapCounter = new Counter(0);
// Notification subscription are handled by
// ListenerServiceMBeanSupport baseclass
log.debug("Instantiating trap emitter ...");
this.trapEmitter = new TrapEmitter(this.getTrapFactoryClassName(),
this.trapCounter,
this.clock,
this.getManagersResName(),
this.getNotificationMapResName());
// Start trap emitter
log.debug("Starting trap emitter ...");
this.trapEmitter.start();
// Get the heartbeat going
this.heartbeat = new Heartbeat(this.getServer(),
this.getTimerName(),
this.getHeartBeatPeriod());
log.debug("Starting heartbeat controller ...");
heartbeat.start();
// subscribe for notifications, with the option for dynamic subscriptions
super.subscribe(this.dynamicSubscriptions);
// initialise the snmp agent
log.debug("Starting snmp agent ...");
startAgent();
log.info("SNMP agent going active");
// Send the cold start!
this.sendNotification(new Notification(EventTypes.COLDSTART, this,
getNextNotificationSequenceNumber()));
}
/**
* Perform service shutdown
**/
protected void stopService()
throws Exception
{
// unsubscribe for notifications
super.unsubscribe();
log.debug("Stopping heartbeat controller ...");
this.heartbeat.stop();
this.heartbeat = null; // gc
log.debug("Stopping trap emitter ...");
this.trapEmitter.stop();
this.trapEmitter = null;
log.debug("Stopping snmp agent ...");
this.agentSession.close();
this.agentSession = null;
log.info("SNMP agent stopped");
}
// Notification handling -----------------------------------------
/**
* All notifications are intercepted here and are routed for emission.
**/
public void handleNotification2(Notification n, Object handback)
{
if (log.isDebugEnabled()) {
log.debug("Received notification: <" + n + "> Payload " +
"TS: <" + n.getTimeStamp() + "> " +
"SN: <" + n.getSequenceNumber() + "> " +
"T: <" + n.getType() + ">");
}
try {
this.trapEmitter.send(n);
}
catch (Exception e) {
log.error("Sending trap", e);
}
}
// Private -------------------------------------------------------
/**
* Start the embedded agent
*/
private void startAgent()
throws Exception
{
// cater for possible global -b option, if no override has been specified
InetAddress address = this.bindAddress != null ? this.bindAddress :
toInetAddress(System.getProperty(ServerConfig.SERVER_BIND_ADDRESS));
// the listening address
SnmpPeer peer = new SnmpPeer(address, this.port);
// set community strings and protocol version
peer.getParameters().setReadCommunity(this.readCommunity);
peer.getParameters().setWriteCommunity(this.writeCommunity);
peer.getParameters().setVersion(this.snmpVersion == SNMPV2 ? SnmpSMI.SNMPV2 : SnmpSMI.SNMPV1);
// Instantiate and initialize the RequestHandler implementation
RequestHandler handler = (RequestHandler)Class.forName(
this.requestHandlerClassName, true, this.getClass().getClassLoader()).newInstance();
handler.initialize(this.requestHandlerResName, this.getServer(), this.log, this.clock);
// Instantiate the AgentSession with an optional thread pool
this.agentSession = this.numberOfThreads > 1
? new SnmpAgentSession(handler, peer, this.numberOfThreads)
: new SnmpAgentSession(handler, peer);
}
/**
* Safely convert a host string to InetAddress or null
*/
private InetAddress toInetAddress(String host)
throws UnknownHostException
{
if (host == null || host.length() == 0)
return null;
else
return InetAddress.getByName(host);
}
}
| SnmpAgentService.java |