CODEWITHSUNDEEP
javasnmpsnmp4j
Lewis Lynn
Lewis Lynn

Reputation: 31

how to receive source IP address from multiple snmp traps with snmp4j

i'm using snmp4j to capture trap data from multiple routers,but i don't know how to receive the source IP address from these routers, which router is the sender. That's my code below, maybe it's useful:

public class SNMPTrapReceiver implements CommandResponder {

private MultiThreadedMessageDispatcher dispatcher;
private Snmp snmp = null;
private Address listenAddress;
private ThreadPool threadPool;
private int n = 0;

public SNMPTrapReceiver() {
}

public static void main(String[] args) {
    new SNMPTrapReceiver().run();
}

private void run() {
    try {
        init();
        snmp.addCommandResponder(this);
    } catch (Exception ex) {
        ex.printStackTrace();
    }
}

private void init() throws UnknownHostException, IOException {
    threadPool = ThreadPool.create("Trap", 10);
    dispatcher = new MultiThreadedMessageDispatcher(threadPool,
            new MessageDispatcherImpl());
    listenAddress = GenericAddress.parse(System.getProperty(
            "snmp4j.listenAddress", "udp:0.0.0.0/162"));
    TransportMapping<?> transport;
    if (listenAddress instanceof UdpAddress) {
        transport = new DefaultUdpTransportMapping(
                (UdpAddress) listenAddress);
    } else {
        transport = new DefaultTcpTransportMapping(
                (TcpAddress) listenAddress);
    }
    USM usm = new USM(SecurityProtocols.getInstance(), new OctetString(
            MPv3.createLocalEngineID()), 0);
    usm.setEngineDiscoveryEnabled(true);

    snmp = new Snmp(dispatcher, transport);
    snmp.getMessageDispatcher().addMessageProcessingModel(new MPv1());
    snmp.getMessageDispatcher().addMessageProcessingModel(new MPv2c());
    snmp.getMessageDispatcher().addMessageProcessingModel(new MPv3(usm));
    SecurityModels.getInstance().addSecurityModel(usm);
    snmp.getUSM().addUser(
            new OctetString("MD5DES"),
            new UsmUser(new OctetString("MD5DES"), AuthMD5.ID,
                    new OctetString("UserName"), PrivDES.ID,
                    new OctetString("PasswordUser")));
    snmp.getUSM().addUser(new OctetString("MD5DES"),
            new UsmUser(new OctetString("MD5DES"), null, null, null, null));

    snmp.listen();
}

public void processPdu(CommandResponderEvent event) {
    StringBuffer msg = new StringBuffer();
    msg.append(event.toString());
    Vector<? extends VariableBinding> varBinds = event.getPDU()
            .getVariableBindings();
    if (varBinds != null && !varBinds.isEmpty()) {
        Iterator<? extends VariableBinding> varIter = varBinds.iterator();
        while (varIter.hasNext()) {
            VariableBinding var = varIter.next();
            msg.append(var.toString()).append(";");
        }
    }
    System.out.println("Message Received: " + msg.toString());
}

}

Upvotes: 3

Views: 1759

Answers (1)

ooSNMP
ooSNMP

Reputation: 377

The CommandResponderEvent contains the sender address in the getPeerAddress() member: See http://www.snmp4j.org/doc/org/snmp4j/CommandResponderEvent.html#getPeerAddress()

If the trap was forwarded by a proxy, the snmpTrapAddress.0 variable binding (defined in the SNMP-COMMUNITY-MIB, RFC3584) will contain the address of the original trap sender.

Upvotes: 2

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