[SNMP4J] Sets and Gets not working...

[Menard, Matt]

I'm having some difficulty performing gets and sets using SNMP4J.  When
ever I perform a get or a set, I get back a PDU and when the response is
examined, there is a single OID (.1.3.6.1.6.3.15.1.1.6.0) in it and the
value increments after each and every message.  The PDU I get back from
my request indicates that everything was successful and yet there are no
changes to any of the MIB variables when sets are performed and none of
the requested OID/values are returned when gets are performed.

 

Here are some of the particulars about this project:

 

SNMP version: 3

SNMP authentication: MD5

SNMP privacy: AES-128

IDE: Borland JBuilder 2005

Java version: 1.4.1_09

SNMP4J version: 1.7.1

SNMP Agent: SNMP Research EMANATE Agent

 

I've included some of the code below, perhaps there is something subtle
that I'm missing or not doing correctly.  

 

Any help would be greatly appreciated!

 

Thanks,
Matt 

 

//------------- CODE --------------------------------

 

//------------- GET REQUEST BUILDER -----------------

private PDU buildSNMPGetRequest(GetMessage getMessage)

{

  // Create the new PDU and set its type to GET

  ScopedPDU pdu = new ScopedPDU();

  

  pdu.setType(PDU.GETBULK);

 

  pdu.setMaxRepetitions(50);

 

  // Get ifNumber only once

  pdu.setNonRepeaters(1);

 

  // set non-default context engine ID (to use targets authoritative
engine ID

  // use an empty (size == 0) octet string)

  pdu.setContextEngineID(new OctetString());

 

  // Next get the list of attributes to retrieve from the getMessage

  Iterator attrIter = getMessage.getAttributes();

 

  // Iterate over the attributes and add each one to the PDU

  while(attrIter.hasNext())

  {

    // Convert the application attributes to the SNMP OIDs.

    String[] oid = mapper.translateToOID((attrIter.next()).toString());

 

    pdu.add(new VariableBinding(new OID(oid[0] + ".0")));

  }

 

  return pdu;

}

 

//------------- REQUEST SENDER -----------------

private PDU sendRequest(String ipAddress,

                        int port,

                        String username,

                        String authPassphrase,

                        String privPassphrase,

                        PDU request,

                        CommandResponder responder)

{

  PDU responsePDU = null;

 

  try

  {

    Snmp snmp = createSnmpSession(username, authPassphrase,
privPassphrase);

 

 

 

    // Create the target and set the individual attributes of this SNMP

    // transaciton.

    Target target = createTarget(username,

                                 authPassphrase,

                                 privPassphrase,

                                 GenericAddress.parse("udp:" + ipAddress
+  "/" + port));

 

    if(responder != null)

    {

      snmp.addCommandResponder(responder);

    }

 

    snmp.listen();

 

    ResponseEvent response = null;

 

    // This is the line that generates the exception.

    response = snmp.send(request, target);

    

    responsePDU = response.getResponse();

 

    snmp.close();

  }

 

  catch(IOException ioe)

  {

    ioe.printStackTrace();

  }

 

  catch(Exception e) 

  {

    e.printStackTrace();

  }

 

  return responsePDU;

}

 

//------------- ADD USER TO USM -----------------

// addUsmUser, lifted from the SnmpRequest.java class contained

// in the SNMP4J package.

private void addUsmUser(Snmp snmp,

                        String username,

                        String authPassphrase,

                        String privPassphrase)

{

  snmp.getUSM().addUser(new OctetString(username),

                        new UsmUser(new OctetString(username),

                                    AuthMD5.ID,

                                    new OctetString(authPassphrase),

                                    PrivAES128.ID,

                                    new OctetString(privPassphrase)));

}

 

//------------- BUILD A NEW SNMP SESSION -----------------

// Portions of this code were derived from the SnmpRequest.java class...

private Snmp createSnmpSession(String username,

                               String authPassphrase,

                               String privPassphrase) throws IOException

{

  // Setup a transport over UDP

  AbstractTransportMapping transport =  new
DefaultUdpTransportMapping();

 

  Snmp snmp =  new Snmp(transport);

 

  // Setup the user security model which will provide privacy
(encryption)

  // and authentication.

  USM usm = new USM(SecurityProtocols.getInstance(),

                    new OctetString(MPv3.createLocalEngineID()), 0);

 

  SecurityModels.getInstance().addSecurityModel(usm);

  addUsmUser(snmp, username, authPassphrase, privPassphrase);

  return snmp;

}

 

//------------- CREATE A NEW TARGET -----------------

// This class was also derived from the SnmpRequest.java

// class.

private Target createTarget(String username,

                            String authPassphrase,

                            String privPassphrase,

                            Address targetAddress)

{

  UserTarget target = new UserTarget();

 

  if(authPassphrase != null)

  {

    if(privPassphrase != null)

    {

      target.setSecurityLevel(SecurityLevel.AUTH_PRIV);

    }

 

    else

    {

      target.setSecurityLevel(SecurityLevel.AUTH_NOPRIV);

    }

  }

 

  else

  {

    target.setSecurityLevel(SecurityLevel.NOAUTH_NOPRIV);

  }

 

  target.setAddress(targetAddress);

  target.setRetries(1);

  target.setTimeout(5000);

  target.setVersion(SnmpConstants.version3);

  target.setSecurityName(new OctetString(username));

 

  return target;

}