[SNMP4J] Howto build a snmp-daemon?

[Deon van der Merwe]

Hi Laura,

Here is more-or-less how I put a SNMP server together.  I hope that I did
not strip it too much...

public class Handler
     implements org.snmp4j.CommandResponder {

  protected org.snmp4j.TransportMapping mServerSocket = null;
  protected org.snmp4j.Snmp mSNMP = null;

  public Handler() {
    mServerSocket = new org.snmp4j.transport.DefaultUdpTransportMapping(new
org.snmp4j.smi.UdpAddress(mPort));
    mSNMP = new org.snmp4j.Snmp(mServerSocket);
    mSNMP.addCommandResponder(this);
    mServerSocket.listen();
  }

  public synchronized void processPdu(
      org.snmp4j.CommandResponderEvent aEvent) {
    org.snmp4j.PDU vPDU = aEvent.getPDU();
    if (vPDU == null) {
      mLogger.warning("NULL PDU received???");
    } else {
      switch (vPDU.getType()) {
        case org.snmp4j.PDU.GET:
          vPDU.setErrorIndex(0);
          vPDU.setErrorStatus(0);
          vPDU.setType(org.snmp4j.PDU.RESPONSE);

          for (int vIndex = 0; vIndex < vPDU.size(); ++vIndex) {
            org.snmp4j.smi.VariableBinding vVB = vPDU.get(vIndex);
            org.snmp4j.smi.OID vOID = vVB.getOid();

              if (vOID.equals(org.snmp4j.mp.SnmpConstants.sysDescr)) {
                vVB.setVariable(new
org.snmp4j.smi.OctetString(mSystemDescription));
              } else if
(vOID.equals(org.snmp4j.mp.SnmpConstants.sysContact)) {
                vVB.setVariable(new
org.snmp4j.smi.OctetString(mSystemContact));
              } else if (vOID.equals(org.snmp4j.mp.SnmpConstants.sysName)) {
                vVB.setVariable(new
org.snmp4j.smi.OctetString(mSystemName));
              } else if
(vOID.equals(org.snmp4j.mp.SnmpConstants.sysLocation)) {
                vVB.setVariable(new
org.snmp4j.smi.OctetString(mSystemLocation));
              } else if (vOID.equals(org.snmp4j.mp.SnmpConstants.sysUpTime))
{
                vVB.setVariable(new
org.snmp4j.smi.TimeTicks((long)(java.lang.System.currentTimeMillis() -
mStartTime)/10l));
              } else if (vOID.equals(vMyMemoryOID)) {
                vVB.setVariable(new
org.snmp4j.smi.UnsignedInteger32((long)vCurrentMemory));
              } else {
              }

          }

          org.snmp4j.mp.StatusInformation statusInformation = new
org.snmp4j.mp.StatusInformation();
          org.snmp4j.mp.StateReference ref = aEvent.getStateReference();
          try {
 
aEvent.getMessageDispatcher().returnResponsePdu(aEvent.getMessageProcessingM
odel(), aEvent.getSecurityModel(), aEvent.getSecurityName(),
aEvent.getSecurityLevel(), vPDU, aEvent.getMaxSizeResponsePDU(), ref,
statusInformation);
          } catch (org.snmp4j.MessageException vException) {
            mLogger.error(vException.getMessage(), vException);
          }
          break;
        default:
          mLogger.warning("Unsupported PDU type received: " +
vPDU.getType());
          break;
      }
    }
  }
}

 

> -----Original Message-----
> From: snmp4j-bounces at agentpp.org 
> [mailto:snmp4j-bounces at agentpp.org] On Behalf Of 
> laura.reising at arcor.de
> Sent: Friday, September 23, 2005 17:29
> To: snmp4j at agentpp.org
> Subject: [SNMP4J] Howto build a snmp-daemon?
> 
> Hello all,
> 
> first of all: I'm new to snmp, so please bear with me!
> 
> I came to snmp because I would like to monitor some performance-issues
> of my JBoss while I'm doing some OpenSTA-tests 
> (http://www.opensta.org).
> OpenSTA offers the possibility to fire snmp-queries while it 
> is running
> it's tests.
> 
> My idea is to write a snmp-daemon (and deploy it under my JBoss) that
> takes this requests, checks (for example) the JBoss-memory 
> und delivers
> this value back to OpenSTA (via a snmp-response).
> 
> So I got SNMP4J-Agent. I took a look at the TestAgent, hoping to adapt
> this class for my needs with some hand grips. But far wrong!
> 
> I hoped to find a Servlet-similar interface with some kind of
> "doGet(SnmpRequest request, SnmpResponse response)"-Method, 
> where I can
> do my work put my response-value back into some kind of 
> response-object.
> 
> This is confusing! I don't have any cue where to start! Do I need all
> this stuff in TestAgent for my simple problem?
> 
> I the a "snmp4j for dummies"-Tutorial?
> 
> Thanks a lot in advance for any answer, tip, hint and/or link!
> 
> Best wishes
> Laura
> 
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