[SNMP4J] Unable to send V3 Trap with authoritative engine ID

[Frank Fock]

Hi,

The trap PDU is malformed regarding the used OIDs (the structure cannot 
exists in properly constructed SMI MIB),
but that is not the cause for your specific problem here.
Just use the UsmUser constructor with localization engine ID parameter 
and put there the "localEngineIdInBytes".

Best regards,
Frank

Am 06.09.2015 um 18:50 schrieb N, Ravikiran:
> HI All,
>
> I am using the below snippet code for sending the SNMPv3 trap with Authoritative Engine ID. I am getting the exception  as " Message processing model 3 returned error: Unknown security name".
> While debugging snmp4j jar I have identified mismatch between Engine ID inserted into the UsmUserTable and EngineId used for retrieval of UsmUser from the UsmUserTable. Please help me through this problem.
>
> My Code for sending V3 trap is as below:
>
> byte[] localEngineIdInBytes = MPv3.createLocalEngineID();
> USM usm = new USM(SecurityProtocols.getInstance(),
>                      new OctetString(localEngineIdInBytes), 0);  //Local Engine Id
>
>
> ScopedPDU pdu = new ScopedPDU();
>                                                                  pdu.setContextName(new OctetString("ContextName"));
>                                                                  pdu.setContextEngineID(new OctetString(localEngineIdInBytes)); // Context Engine ID
>                                                                  pdu.setType(ScopedPDU.TRAP);
>
>                                                        long sysUpTime = (System.currentTimeMillis() - start) / 10;
>
>                                                        pdu.add(new VariableBinding(new OID(trapOid + ".7"), new TimeTicks(sysUpTime)));
>                                                        pdu.add(new VariableBinding(new OID(trapOid + ".8"), new OID(trapOid)));
>                                                                  pdu.add(new VariableBinding(new OID(trapOid + ".1"), new OctetString("ssid")));
>                                                                  pdu.add(new VariableBinding(new OID(trapOid + ".2"), new OctetString("1234")));
>                                                                  pdu.add(new VariableBinding(new OID(trapOid + ".3"), new OctetString("CRI")));
>                                                                  pdu.add(new VariableBinding(new OID(trapOid + ".4"), new OctetString("PROCESS")));
>                                                                  pdu.add(new VariableBinding(new OID(trapOid + ".5"), new OctetString(new Date().toString())));
>                                                                  pdu.add(new VariableBinding(new OID(trapOid + ".6"), new OctetString("message")));
>
>
> TransportMapping transport = new DefaultUdpTransportMapping();
> Address targetAddress = GenericAddress.parse("udp:127.0.0.1/" + port);
>
> UserTarget comtarget = new UserTarget();
>                                                          comtarget.setVersion(SnmpConstants.version3);
>                                                          comtarget.setAddress(targetAddress);
>                                                          comtarget.setRetries(2);
>                                                          comtarget.setTimeout(5000);
>                                                          comtarget.setSecurityName(new OctetString("abhi"));
>                                                          comtarget.setSecurityModel(3);
>                                                          comtarget.setSecurityLevel(SecurityLevel.AUTH_PRIV);
>
>
>
>
> SecurityModels.getInstance().addSecurityModel(usm);
>
>                                                                    SNMP snmp = new Snmp(transport);
>
>                                                          snmp.getUSM().addUser(new OctetString("abhi"), new OctetString(localEngineIdInBytes),),   // Authoratative Engine ID
>                                                                                  new UsmUser(new OctetString("abhi"), AuthSHA.ID,
>                                                                                                                          new OctetString("12345678"), PrivDES.ID,
>                                                                                                                          new OctetString("12345678")));
>
> snmp.send(pdu, comtarget);
> snmp.close();
>
> Regards,
> Ravikiran N
>
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