[SNMP4J] A Simple Trap Receiver using snmp4j

[Tsiyona]

Hello,

I am trying to write a simple snmp manager that listens to traps on port 162
and processes them. This manager will only handle traps, and does not need
to send commands to agents.

Attached is the code I wrote. It is straightforward, but it does not work -
I do not get any snmp traps.
I make sure that the snmp agent really constantly generates traps, by using
a network sniffer, so my
problem is not lack of traps on the agent side. I am probably doing
something wrong.

Can anyone please help me?

Thanks,
Tsiyona


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                            My code:
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package snmpmanager;

import java.io.IOException;

import org.snmp4j.CommandResponder;
import org.snmp4j.CommandResponderEvent;
import org.snmp4j.PDU;
import org.snmp4j.Snmp;
import org.snmp4j.TransportMapping;
import org.snmp4j.smi.UdpAddress;
import org.snmp4j.transport.DefaultUdpTransportMapping;
import org.snmp4j.transport.TransportMappings;

/**
* A Simple Trap receiver using snmp4j.
*/
public class SnmpClient
{

public static final String TRAP_ADDRESS = "127.0.0.1/162";        //"udp:
127.0.0.1/162";
 private TransportMapping transport;
private String listeningAddress;
 private Snmp snmp;

public SnmpClient(String address)
{
 this.listeningAddress = address;
try {
start();
 } catch (IOException e) {
e.printStackTrace();
throw new RuntimeException(e);
 }
}

private void start() throws IOException
 {
UdpAddress udpAddress = new UdpAddress(this.listeningAddress);
transport = new DefaultUdpTransportMapping(udpAddress);
 snmp = new Snmp(transport);
transport.listen();
 CommandResponder pduHandler = new CommandResponder() {
     public synchronized void processPdu(CommandResponderEvent e) {
       PDU pdu = e.getPDU();
       if (pdu != null) {
       System.out.println(pdu);
       }
     }
};
 snmp.addCommandResponder(pduHandler);
}
 public void stop() throws IOException
{
 snmp.close();
}

public static void main(String[] args)
 {
SnmpClient client = new SnmpClient(TRAP_ADDRESS);
System.out.println("Listening for traps on address " + TRAP_ADDRESS);
 }
}