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,

bista