[AGENT++] unable to decode message

[Padala]

Hi Frank
   
  Thanks for your information.Please find the attached documents.
  
I have developed an agent using snmp4j APIs. This agent application is working fine w.r.t v1 and v2 snmp requests.
 
I have tested this by giving snmpget (netsnmp) command from my linux console.
 
Then I start testing agent application by giving snmp v3 requests.
In this case my agent application is giving response for the respective request. But Net-SNMP snmpget command is unable to decode that response.
 
The snmpget command is 
snmpget -v 3 -a MD5 -A "hello1234"  -l noAuthNoPriv  -u "snmpuser1" -x DES -X hello1234 annra01-xp1 .1.3.6.1.2.1.2.2.1.2.1 -t 30 -d
 
snmpget command is throwing time out problem. 
 
I have take ethereal traces for message exchanging between agent n manager.
 
Please find attachment for ethereal traces and snmpget response.
 
Could you please help me out to solve my problem.
 
Sorry for my poor english.
 
Thanks in advance
Sai

   
  
Frank Fock <fock at agentpp.com> wrote:
  Hi,

Please use the SNMP4J mailing list for questions about SNMP4J.
Why are you using SNMP4J to build a command responder application
instead of SNMP4J-Agent?

Please read the SNMPv3 RFCs carefully - especially about engine
IDs. Then check your code again and also read the SNMP4J JavaDoc
(i.e., about timeout handling).

Best regards,
Frank

Padala 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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