[SNMP4J] where to call processPdu from in the agent?

[Frank Fock]

Hi,

To write a SNMP agent, please use SNMP4J-Agent.

Best regards,
Frank

On 03.09.2010 07:56, Nidhi Lohat wrote:
> Hello Everyone,
>
> I’ve made the simplest possible agent just to check if it can respond to the
> PDUs received from the manager. Although I’ve written the following code with
> the help of the SNMP4J tutorials, I have my doubt as to where is the processPdu
> function called in the program? I’ve written it fine, but I don’t see it being
> called. Thus, where is it that the PDU sent from the manager is actually
> received? Following is my code and the errors it generates. Please tell me where
> I’m going wrong. Also, since i'm working on Eclipse IDE, it seems quite
> confusing to me how to execute manager and agent together in order to create a
> communication session( just da way v do in socket programming). it seems that i
> can only run either of them at a time..
>
> publicclassSNMP4J_AGENT extendsThread implementsCommandResponder
> {
>
>        /**
>         *@paramargs
>         */
>        // Processes incoming Pdu
>      publicsynchronizedvoidprocessPdu(CommandResponderEvent e)
>      {
>          System.out.println("Command");
>          ScopedPDU command;
>          if( e.getPDU() instanceofScopedPDU)
>          {
>              command = (ScopedPDU)e.getPDU();
>          }
>          else
>          {
>              command = (ScopedPDU)e.getPDU();
>          }
>          if(command != null)
>          {
>              //send reply
>              ScopedPDU cmd = (ScopedPDU)e.getPDU();
>              cmd.setType(ScopedPDU.RESPONSE);
>              cmd.setRequestID(command.getRequestID());
>              StatusInformation st=new  StatusInformation(newVariableBinding(),
>                                   e.getStateReference().getContextName(),
>                                   e.getStateReference().getContextEngineID(),
>                                   newInteger32(
> e.getStateReference().getSecurityLevel()) );
>
>              StatusInformation statusInformation = newStatusInformation();
>              StateReference ref = e.getStateReference();
>              System.out.println(ref);
>              try
>              {
>
>       e.getMessageDispatcher().returnResponsePdu(e.getMessageProcessingModel(),
>
>
>                                      e.getSecurityModel(),
>                                                              e.getSecurityName(),
>
>                                                  e.getSecurityLevel(),
>                                                              command,
>
>                                                  e.getMaxSizeResponsePDU(),
>                                                              ref,
>                                                              st);
>                   System.out.println("Response sent to manager....");
>               }
>              catch(MessageException e1)
>              {
>                    e1.printStackTrace();  //To change body of catch statement use
> File | Settings | File Templates
>              }
>
>          }
>
>       }
>      @Override
>      publicvoidrun()
>        {
>              //InetAddress hostIp;
>              //int port_, version;
>            try
>          {
>             //Sets the snmp listener to port
>             TransportMapping transport =
> newDefaultUdpTransportMapping(newUdpAddress("udp:127.0.0.1/161"));
>             Snmp snmp = newSnmp(transport); //snmp.addCommandResponder(this);
>             MPv3 mpv3 =
> (MPv3)snmp.getMessageProcessingModel(MessageProcessingModel.MPv3);
>             System.out.println("in try");
>
>             //if (version == 3)
>             {
>               byte[] localEngineID
> =((MPv3)snmp.getMessageProcessingModel(MessageProcessingModel.MPv3)).createLocalEngineID();
>
>               USM usm = newUSM(SecurityProtocols.getInstance(),
>                                 newOctetString(localEngineID),0);
>               SecurityModels.getInstance().addSecurityModel(usm);
>               snmp.setLocalEngine(localEngineID, 0, 0);
>
>               // Add the configured user to the USM
>               snmp.getUSM().addUser(newOctetString("MD5DES"),
>                                      newUsmUser(newOctetString("MD5DES"),
>                                                                      AuthMD5.ID,
>
> newOctetString("MD5DESUserAuthPassword"),
>
> PrivDES.ID,
>
> newOctetString("MD5DESUserPrivPassword")));
>               System.out.println("USM: "+ snmp.getUSM());
>
>             }
>            snmp.addCommandResponder(this);
>            //snmp.listen();
>           //   md.addCommandResponder(this);
>             System.out.println("transportBinding..");
>             transport.listen();
>
>             // transport.listen();
>             System.out.print("SNMP Listener init: ");
>             Address a = transport.getListenAddress();
>             System.out.println(a.toString());
>             //snmp.processPdu(this);
>            /* try
>             {
>                 snmp.processPdu(arg0);
>             }
>             catch(Exception ex)
>             {
>                 ex.getMessage();
>             }*/
>             snmp.close();
>          }
>            catch(IOException e)
>            {
>              System.err.print("ERROR!!!!! "+e);
>          }
>            try
>            {
>              this.wait();
>            }
>            catch(InterruptedException ex)
>            {
>              Thread.currentThread().interrupt();
>            }
>
>
>      }
>
>        publicstaticvoidmain(String[] args)throwsException
>        {
>              // TODOAuto-generated method stub
>
>            newSNMP4J_AGENT().start();
>        }
>
> }
>
> Errors:
> Exception in thread "Thread-0" java.lang.IllegalArgumentException:
> udp:127.0.0.1/161
>        at org.snmp4j.smi.UdpAddress.<init>(UdpAddress.java:48)
>        at SNMP4J_AGENT.run(SNMP4J_AGENT.java:100)
>
>
> Thanx a lot…..
>
> Regards,
>
> Nidhi Lohat,
> Software Trainee,
> Eminent Networks Pvt. Ltd.(HFCL Group)
>
>
>
> _______________________________________________
> SNMP4J mailing list
> SNMP4J at agentpp.org
> http://lists.agentpp.org/mailman/listinfo/snmp4j

-- 
AGENT++
http://www.agentpp.com
http://www.snmp4j.com
http://www.mibexplorer.com
http://www.mibdesigner.com