Re: [Mibble-users] unable to decode message

[Per Cederberg]

The mibble-users group is for questions concerning Mibble. Please go
to the respective forums for those other products or projects you're
mentioning instead of misusing this group. Thanks.

/Per

On Fri, Mar 28, 2008 at 6:37 AM, Padala <address@hidden> wrote:
> Hi All
>
> My Application using SNMP4J API  is to give response for snmp v3 requests.
>
> I have given the following netsnmp command from my linux box.
>
> snmpget -v 3 -a MD5 -A 'hello1234'  -l authPriv  -u 'snmpuser1' -x DES -X
> hello1234 annra01-xp1 1.3.6.1.2.1.2.2.1.2.1 -t 30 -d
>
>
>
> My Agent application is responding to snmp request and it is sending the
> response but NetSNMP Get command unable to decode the message.
>
> I also attaching netsnmp output.
>
>
>
> class MySNMPResponse extends Thread implements CommandResponder
> {
>
> public MySNMPResponse()
>
> {
> try
>
> {
>
> udpAddress = new UdpAddress('0.0.0.0/161');
>
> TransportMapping transport = new DefaultUdpTransportMapping(udpAddress);
>
> snmp = new Snmp(transport);
>
> localEngineID = ((MPv3)snmp.getMessageProcessingModel
>
> (MessageProcessingModel.MPv3)).createLocalEngineID();
>
> USM usm = new USM(SecurityProtocols.getInstance(), new
> OctetString(localEngineID), 0);
>
> SecurityModels.getInstance().addSecurityModel(usm);
>
> snmp.getUSM().addUser(new OctetString('snmpuser1'),
>
> new UsmUser(new OctetString('snmpuser1'),
>
> AuthMD5.ID, new OctetString('hello1234'),
>
> PrivDES.ID, new OctetString('hello1234')));
>
> snmp.setLocalEngine(localEngineID, 0, 0);
>
> snmp.addCommandResponder(this);
>
> transport.listen();
>
> start();
>
> }
>
> catch(Exception e)
>
> {
>
> e.printStackTrace();
>
> }
>
> }//MySNMPResponse()
>
>
>
> public void run()
>
> {
>
> //infinite loop
>
> while(1);
>
> }//Run()
>
>
>
>
>
> public synchronized void processPdu(CommandResponderEvent e)
>
> {
>
> System.out.println('in ProcessPDU');
>
>
> //System.out.println(e.getSecurityLevel());
>
> /*Creating Target Object*/
>
> PDU pdu = e.getPDU();
>
> TransportMapping tm = e.getTransportMapping();
>
> if(pdu != null )
>
> {
>
> int snmpVersion = e.getMessageProcessingModel();
>
> PDU responsePDU = null;
>
> Target target = null;
>
> if(snmpVersion == MessageProcessingModel.MPv1 || snmpVersion ==
>
> MessageProcessingModel.MPv2c ||snmpVersion == MessageProcessingModel.MPv2u)
>
> {
>
> //Create an object of CommunityTarget and assing to target
>
> //Create an object of PDU and assign to responsePDU
>
> }
>
> else if(snmpVersion == MessageProcessingModel.MPv3)
>
> {
>
> UserTarget userTarget = new UserTarget();
>
> userTarget.setAddress((UdpAddress) e.getPeerAddress());
>
> userTarget.setRetries(1);
>
> // set timeout to 500 milliseconds -> 2*500ms = 1s total timeout
>
> userTarget.setTimeout(500);
>
> userTarget.setVersion(SnmpConstants.version3);
>
> System.out.println(e.getSecurityLevel());
>
> System.out.println(new OctetString(e.getSecurityName()));
>
> userTarget.setSecurityLevel(e.getSecurityLevel());
>
> userTarget.setSecurityName(new OctetString(e.getSecurityName()));
>
> ScopedPDU scopedPDU = new ScopedPDU();
>
> scopedPDU.setContextName(new OctetString('snmpuser1'));
>
> scopedPDU.setContextEngineID(new OctetString('123456789123456789'));
>
> responsePDU = scopedPDU;
>
> target = userTarget;
>
> }
>
> }
>
> try
>
> {
>
> //Setting Response Packet Attributes
>
> responsePDU.setRequestID(new Integer32(pdu.getRequestID().getValue()));
>
> responsePDU.setType(PDU.RESPONSE);
>
> responsePDU.setErrorStatus(PDU.noError);
>
> responsePDU.setErrorIndex(0); // NO ERROR
>
> Vector variableBindings = pdu.getVariableBindings();
>
> for(int index = 0;index < variableBindings.size();index++)
>
> {
>
> Variable value = null;
>
> VariableBinding var = (VariableBinding)variableBindings.get(index);
>
> OID oid = var.getOid();
>
> VariableBinding vbObj = new VariableBinding(oid,new Integer32(4));
>
> responsePDU.add(vbObj);
>
> }
>
> snmp.send(responsePDU, target, tm);
>
> }
>
> catch(Exception e)
>
> {
>
> e.printStackTrace();
>
> }
>
> }//ProcessPDU
>
> public void main(String s[])
>
> {
>
> MySNMPResponse resObj = new MySNMPResponse();
>
> }//main
>
> }//MySnmpResponse
>
>
>
> I would appreciate if you provide any inputs to solve porblem.
>
>
>
> Thanks in advance,
>
>  Sai
>
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