/*
* @(#)file SnmpResponseHandler.java
* @(#)author Sun Microsystems, Inc.
* @(#)version 1.10
* @(#)date 09/10/11
*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
*/
package com.sun.jmx.snmp.daemon;
// JAVA imports
//
import java.net.DatagramPacket;
// JMX imports
//
import com.sun.jmx.snmp.SnmpMessage;
import com.sun.jmx.snmp.SnmpPduFactory;
import com.sun.jmx.snmp.SnmpPduPacket;
import com.sun.jmx.snmp.SnmpPduRequest;
// SNMP Runtime imports
//
import com.sun.jmx.trace.Trace;
/**
* This class is used to handle received inform request responses.
* This classes parses the SNMP inform response packet to obtain the corresponding inform request.
*/
class SnmpResponseHandler {
// VARIABLES
//----------
SnmpAdaptorServer adaptor = null;
SnmpQManager snmpq = null;
// CONSTRUCTORS
//-------------
public SnmpResponseHandler(SnmpAdaptorServer adp, SnmpQManager s) {
adaptor = adp;
snmpq = s;
}
// PUBLIC METHODS
//---------------
public synchronized void processDatagram(DatagramPacket dgrm) {
byte []data = dgrm.getData();
int datalen = dgrm.getLength();
if (isTraceOn()) {
trace("processDatagram", "Received from " + dgrm.getAddress().toString() + " Length = " + datalen +
"\nDump : \n" + SnmpMessage.dumpHexBuffer(data, 0, datalen));
}
try {
SnmpMessage msg = new SnmpMessage();
msg.decodeMessage(data, datalen);
msg.address = dgrm.getAddress();
msg.port = dgrm.getPort();
// Retreive the PDU factory of the SNMP adaptor to decode the received inform response.
//
SnmpPduFactory pduFactory = adaptor.getPduFactory();
if (pduFactory == null) {
if (isDebugOn()) {
debug("processDatagram", "Dropping packet. Unable to find the pdu factory of the SNMP adaptor server");
}
}
else {
SnmpPduPacket snmpProt = (SnmpPduPacket)pduFactory.decodeSnmpPdu(msg);
if (snmpProt == null) {
if (isDebugOn()) {
debug("processDatagram", "Dropping packet. Pdu factory returned a null value");
}
}
else if (snmpProt instanceof SnmpPduRequest) {
SnmpPduRequest pduReq = (SnmpPduRequest)snmpProt;
SnmpInformRequest req = snmpq.removeRequest(pduReq.requestId) ;
if (req != null) {
req.invokeOnResponse(pduReq);
} else {
if (isDebugOn()) {
debug("processDatagram", "Dropping packet. Unable to find corresponding for InformRequestId = " + pduReq.requestId);
}
}
}
else {
if (isDebugOn()) {
debug("processDatagram", "Dropping packet. The packet does not contain an inform response");
}
}
snmpProt = null ;
}
} catch (Exception e) {
if (isDebugOn()) {
debug("processDatagram", "Exception while processsing");
debug("processDatagram", e);
}
}
}
// TRACES & DEBUG
//---------------
boolean isTraceOn() {
return Trace.isSelected(Trace.LEVEL_TRACE, Trace.INFO_ADAPTOR_SNMP);
}
void trace(String clz, String func, String info) {
Trace.send(Trace.LEVEL_TRACE, Trace.INFO_ADAPTOR_SNMP, clz, func, info);
}
void trace(String func, String info) {
trace(dbgTag, func, info);
}
boolean isDebugOn() {
return Trace.isSelected(Trace.LEVEL_DEBUG, Trace.INFO_ADAPTOR_SNMP);
}
void debug(String clz, String func, String info) {
Trace.send(Trace.LEVEL_DEBUG, Trace.INFO_ADAPTOR_SNMP, clz, func, info);
}
void debug(String clz, String func, Throwable exception) {
Trace.send(Trace.LEVEL_DEBUG, Trace.INFO_ADAPTOR_SNMP, clz, func, exception);
}
void debug(String func, String info) {
debug(dbgTag, func, info);
}
void debug(String func, Throwable exception) {
debug(dbgTag, func, exception);
}
String dbgTag = "SnmpResponseHandler";
}