[SNMP4J] TCP Socket in SYN_RECV when sending V3 traps

[Neeraj Vaidya]

Hi Frank,
Coming back to this conversation as I have been away from this task due to other project commitments.
In the example below, I have also noticed that if I change the PDU type to INFORM, the receiving snmptrap collector (which is net-snmp snmptrapd) fails to match the engine id. It picks up something totally different from what I am setting below.
Is there some other place where I need to set the engineId ?

Regards,
Neeraj

Sent from my iPhone

On 24 May 2017, at 16:44, Frank Fock <fock at agentpp.com> wrote:

>> 
>> ------------------------------------------------ Code Start ------------------------------------------------ 
>> 
>>               Address address = GenericAddress.parse("tcp:rhelhost1/1163");
>> 
>>        try {
>>            TransportMapping transportMapping = new DefaultTcpTransportMapping();
>>            transportMapping.listen();            
>>                    
>>            Snmp snmp = new Snmp(transportMapping);
>> 
>>            USM usm = new USM(SecurityProtocols.getInstance(),
>>                                                      new OctetString(MPv3.createLocalEngineID()), 0);
>>            
>>            SecurityModels.getInstance().addSecurityModel(usm);
>> 
>>            //snmp.listen(); ----> Do I need to use this invocation ??
>> 
>>            byte[] b = (new BigInteger("0102030405",16)).toByteArray();
>> 
>>            snmp.getUSM().addUser(new OctetString("snmp4j"),
>>                    new UsmUser(new OctetString("snmp4j"), AuthMD5.ID, new OctetString("snmp4j"), PrivDES.ID, new OctetString("snmp4j")));
>>            
>>            UserTarget target = new UserTarget();
>>                
>>            target.setAddress(address);
>>            target.setRetries(1);
>>            target.setTimeout(5000);
>>            target.setVersion(SnmpConstants.version3);
>>            target.setSecurityLevel(SecurityLevel.AUTH_NOPRIV);
>>            target.setSecurityName(new OctetString("snmp4j"));
>>            
>>            // create the PDU
>>            ScopedPDU pdu = new ScopedPDU();
>>            long sysUpTime = Instant.now().getEpochSecond();
>>            //pdu.add(new VariableBinding(SnmpConstants.sysUpTime),new OctetString(new Date().toString()));
>>            pdu.setType(ScopedPDU.TRAP);            
>>            pdu.add(new VariableBinding(SnmpConstants.sysUpTime, new TimeTicks(sysUpTime)));
>>            pdu.add(new VariableBinding(SnmpConstants.snmpTrapOID, SnmpConstants.linkUp));
>>            pdu.setContextEngineID(new OctetString().fromByteArray(b));
>>            snmp.setLocalEngine(b, 0, 0);
>>            // send the PDU            
>>            
>>            ResponseEvent response = null;
>> 
>>            response = snmp.send(pdu, target);
>> 
>>            Thread.sleep(10); // This Sleep somehow allows the entire TCP 3-way handshake to occur without terminating the program 
>> 
>>            snmp.close();            
>> 
>>        } catch (IOException e) {
>>            e.printStackTrace();
>>        } catch (InterruptedException e) {
>>            e.printStackTrace();
>>        }    
>> ------------------------------------------------ Code End  -----------------------------------------------