[SNMP4J] How to implement MIB?

[Deon van der Merwe]

Hi Jozef,

Here is a very basic example of an application that can receive and respond 
to GET requests.  Hope that it helps you...


>Date: Thu, 19 Aug 2004 10:28:38 +0200
>To: snmp4j at agentpp.org
>From: Deon van der Merwe <dvdm at truteq.co.za>
>Subject: Re: [SNMP4J] Example Agent
>
>Hi Hector,
>
>At 08:18 PM 8/18/2004, Hector Aquiles Aranguren Gonzalez wrote:
>
>>  Hi, where can i found an example about Make a SNMP Agent with SNMP4J?
>>    Receive and respond the message to a NMS??
>
>I have been able to do this (if I understand your question 
>correctly...)  Here is
>a little snippet of how I did it.  This was done using the 
>CommandResponder (as
>Frank suggested)
>
>This is part of an existing system, and I removed what I could that has no 
>direct
>relation on this.  Hope that it makes more or less some sense...
>
>
>
>public class Handler
>      implements org.snmp4j.CommandResponder {
>   protected java.lang.String mAddress = null;
>   protected int mPort = 0;
>   protected java.lang.String mMyCommunityName = null;
>   protected org.snmp4j.TransportMapping mServerSocket = null;
>   protected org.snmp4j.Snmp mSNMP = null;
>   public Handler() {
>   }
>   public void configure(
>       com.truteq.Configuration aConfiguration)
>        throws com.truteq.ConfigurationException {
>     mAddress = aConfiguration.getChild(Constants.ADDRESS).getAsString();
>     mPort = aConfiguration.getChild(Constants.PORT).getAsInt();
>     mMyCommunityName = 
> aConfiguration.getChild(Constants.COMMUNITY).getAsString();
>   }
>   public void start()
>        throws com.truteq.ServiceException {
>     try {
>       mServerSocket = new 
> org.snmp4j.transport.DefaultUdpTransportMapping(new 
> org.snmp4j.smi.UdpAddress(java.net.InetAddress.getByName(mAddress), mPort));
>       mSNMP = new org.snmp4j.Snmp(mServerSocket);
>       mSNMP.addCommandResponder(this);
>       mServerSocket.listen();
>     } catch (java.net.UnknownHostException vException) {
>       mLogger.error(vException.getMessage(), vException);
>     } catch (java.io.IOException vException) {
>       mLogger.error(vException.getMessage(), vException);
>     }
>   }
>   /**
>    * this is called by the application that processed the actual SNMP 
> request in
>    * order to send response...
>    */
>   public synchronized void submit(
>       com.truteq.protocol.Message aMessage)
>        throws com.truteq.net.HandlerException {
>     if (aMessage.getType() == com.truteq.protocol.Message.SNMP4J) {
>       com.truteq.protocol.counter.snmp4j.Message vMessage = 
> (com.truteq.protocol.counter.snmp4j.Message) aMessage;
>       org.snmp4j.CommandResponderEvent vEvent = vMessage.getPDU();
>       org.snmp4j.PDU vPDU = vEvent.getPdu();
>       if (mLogger.isDebugEnabled()) {
>         mLogger.debug("(snd) " + vPDU.toString());
>       } else {
>       }
>       org.snmp4j.mp.StatusInformation statusInformation = new 
> org.snmp4j.mp.StatusInformation();
>       org.snmp4j.mp.StateReference ref = vEvent.getStateReference();
>       try {
> 
>vEvent.getMessageDispatcher().returnResponsePdu(vEvent.getMessageProcessingModel(), 
>vEvent.getSecurityModel(), vEvent.getSecurityName(), 
>vEvent.getSecurityLevel(), vPDU, vEvent.getMaxSizeResponsePDU(), ref, 
>statusInformation);
>       } catch (org.snmp4j.MessageException vException) {
>         mLogger.error(vException.getMessage(), vException);
>       }
>     } else {
>     }
>   }
>   public synchronized void processPdu(
>       org.snmp4j.CommandResponderEvent aEvent) {
>     java.lang.String vCommunityName = new 
> java.lang.String(aEvent.getSecurityName());
>     if (mMyCommunityName.equals(vCommunityName)) {
>       org.snmp4j.PDU vPDU = aEvent.getPdu();
>       if (vPDU == null) {
>       } else {
>         if (mLogger.isDebugEnabled()) {
>           mLogger.debug("(rcv) " + vPDU.toString());
>         } else {
>         }
>         switch (vPDU.getType()) {
>           case org.snmp4j.PDU.GET:
>           case org.snmp4j.PDU.GETNEXT:
>             try {
>               setChanged();
>               notifyObservers(new 
> com.truteq.protocol.counter.snmp4j.Message(aEvent));
>             } catch (java.lang.Exception vNotifyException) {
>               mLogger.error(vNotifyException.getMessage(), vNotifyException);
>             }
>             break;
>         }
>       }
>     } else {
>       mLogger.warning("supplied community string does not match mine... 
> ignore request: " + aEvent);
>     }
>   }
>}




At 10:03 PM 7/12/2005, jj777 at speakeasy.net wrote:
>Hello,
>
>I have managed to compile and run both SnmpRequest and TestAgent.
>Now, I am trying to figure out how to write an agent which would
>implement my simple enterprise MIB. Basically, I would need the
>agent to properly respond to a GET PDU. It should lunch a proper
>method on an external object based on the OID, receive the return
>value from the method and then send the response with the return
>value back to the client. Which classes should I look at? Can
>someone point me to the right direction, please?
>
>Jozef
>
>
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-Deon
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