Send trap v2 in Java

Question

How can I send snmpv2 traps from Java application. I tried to do example on snmp4j, but it didn't work.

Mohn

duplicates #3329878 – Errick

Answer 1

I use SNMP4J for this.

This javadoc might help you write your code. You can use the Snmp.trap() method

Edit:

Well, I dont have code of my own at this moment, but you may refer this one . You have to use Snmp.notify() for sending V2 trap instead of Snmp.trap() as trap() only supports sending V1 traps.

Asterism

Answer 2

It took me some time but I finally figured out how to use SNMP4J to send a trap: Hope that helps..

  public static void main(String[] args) throws Exception {
      // Create PDU           
      PDU trap = new PDU();
      trap.setType(PDU.TRAP);

      OID oid = new OID("1.2.3.4.5");
      trap.add(new VariableBinding(SnmpConstants.snmpTrapOID, oid));
      trap.add(new VariableBinding(SnmpConstants.sysUpTime, new TimeTicks(5000))); // put your uptime here
      trap.add(new VariableBinding(SnmpConstants.sysDescr, new OctetString("System Description"))); 

      //Add Payload
      Variable var = new OctetString("some string");          
      trap.add(new VariableBinding(oid, var));          

      // Specify receiver
      Address targetaddress = new UdpAddress("10.101.21.32/162");
      CommunityTarget target = new CommunityTarget();
      target.setCommunity(new OctetString("public"));
      target.setVersion(SnmpConstants.version2c);
      target.setAddress(targetaddress);

      // Send
      Snmp snmp = new Snmp(new DefaultUdpTransportMapping());
      snmp.send(trap, target, null, null);                      
}

Katerine

@Matthieu sysUpTime is; don't know why hannes put sysDescr in there though. The snmpTrapOID is in the wrong place too and order matters. – Malraux

@LightnessRacesinOrbit thanks for pointing it out (sysUpTime should be first, followed by trapOID). I guess the overwhelming amount of RFCs involved in SNMP gives a great space for books to be written, and questions to be asked! – Vivl

@Vivl No probs, and yes indeed! Trouble is, many (most?) implementations are broken/wrong/non-compliant so even if you get it right, you can't assume that anybody else has! – Malraux

Answer 3

A good example that sends trap V1 and notification V2. I just needed to modify the port to 162 and the way to set the sysUpTime for both version V1 and V2.

Tested with snmp4j-1.10.1 and snmp4j-2.1.0.

http://www.techdive.in/snmp/snmp4j-trap-sender

package snippet;

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import java.util.Date;

import org.snmp4j.CommunityTarget;
import org.snmp4j.PDU;
import org.snmp4j.PDUv1;
import org.snmp4j.Snmp;
import org.snmp4j.TransportMapping;
import org.snmp4j.mp.SnmpConstants;
import org.snmp4j.smi.IpAddress;
import org.snmp4j.smi.OID;
import org.snmp4j.smi.OctetString;
import org.snmp4j.smi.UdpAddress;
import org.snmp4j.smi.TimeTicks;
import org.snmp4j.smi.VariableBinding;
import org.snmp4j.transport.DefaultUdpTransportMapping;

public class TrapSender {
    public static final String community = "public";

    // Sending Trap for sysLocation of RFC1213
    public static final String trapOid = ".1.3.6.1.2.1.1.6";

    public static final String ipAddress = "192.168.1.52";

    public static final int port = 162;

    public TrapSender() {
    }

    public static void main(String[] args) {
        TrapSender snmp4JTrap = new TrapSender();

        /* Sending V1 Trap */
        snmp4JTrap.sendSnmpV1Trap();

        /* Sending V2 Trap */
        snmp4JTrap.sendSnmpV2Trap();
    }

    /**
     * This methods sends the V1 trap to the Localhost in port 163
     */
    public void sendSnmpV1Trap() {
        try {
            // Create Transport Mapping
            TransportMapping transport = new DefaultUdpTransportMapping();
            transport.listen();

            // Create Target
            CommunityTarget comtarget = new CommunityTarget();
            comtarget.setCommunity(new OctetString(community));
            comtarget.setVersion(SnmpConstants.version1);
            comtarget.setAddress(new UdpAddress(ipAddress + "/" + port));
            comtarget.setRetries(2);
            comtarget.setTimeout(5000);

            // Create PDU for V1
            PDUv1 pdu = new PDUv1();
            pdu.setType(PDU.V1TRAP);
            pdu.setEnterprise(new OID(trapOid));
            pdu.setGenericTrap(PDUv1.ENTERPRISE_SPECIFIC);
            pdu.setSpecificTrap(1);
            pdu.setAgentAddress(new IpAddress(ipAddress));
                    long sysUpTime = 111111;
        pdu.setTimestamp(sysUpTime);

            // Send the PDU
            Snmp snmp = new Snmp(transport);
            System.out.println("Sending V1 Trap to " + ipAddress + " on Port " + port);
            snmp.send(pdu, comtarget);
            snmp.close();
        } catch (Exception e) {
            System.err.println("Error in Sending V1 Trap to " + ipAddress + " on Port " + port);
            System.err.println("Exception Message = " + e.getMessage());
        }
    }

    /**
     * This methods sends the V2 trap to the Localhost in port 163
     */
    public void sendSnmpV2Trap() {
        try {
            // Create Transport Mapping
            TransportMapping transport = new DefaultUdpTransportMapping();
            transport.listen();

            // Create Target
            CommunityTarget comtarget = new CommunityTarget();
            comtarget.setCommunity(new OctetString(community));
            comtarget.setVersion(SnmpConstants.version2c);
            comtarget.setAddress(new UdpAddress(ipAddress + "/" + port));
            comtarget.setRetries(2);
            comtarget.setTimeout(5000);

            // Create PDU for V2
            PDU pdu = new PDU();

            // need to specify the system up time
                    long sysUpTime = 111111;
            pdu.add(new VariableBinding(SnmpConstants.sysUpTime, new TimeTicks(sysUpTime)));
            pdu.add(new VariableBinding(SnmpConstants.snmpTrapOID, new OID(trapOid)));
            pdu.add(new VariableBinding(SnmpConstants.snmpTrapAddress, new IpAddress(ipAddress)));

            // variable binding for Enterprise Specific objects, Severity (should be defined in MIB file)
            pdu.add(new VariableBinding(new OID(trapOid), new OctetString("Major")));
            pdu.setType(PDU.NOTIFICATION);

            // Send the PDU
            Snmp snmp = new Snmp(transport);
            System.out.println("Sending V2 Trap to " + ipAddress + " on Port " + port);
            snmp.send(pdu, comtarget);
            snmp.close();
        } catch (Exception e) {
            System.err.println("Error in Sending V2 Trap to " + ipAddress + " on Port " + port);
            System.err.println("Exception Message = " + e.getMessage());
        }
    }
}

Pneumothorax

@durron597 So what happens if the link dies? Pasting the code is a good idea. – Overstuffed

Answer 4

I would go for snmp4j library http://www.snmp4j.org/.

import org.snmp4j.*; 
import org.snmp4j.event.*;

...
CommunityTarget target = new CommunityTarget(); 
target.setCommunity(new OctetString("public")); 
target.setAddress(targetAddress); 
target.setVersion(SnmpConstants.version2c); 

PDU request = new PDU(); 
request.setType(PDU.V2TRAP); 
request.setGenericTrap(PDUv2.COLDSTART); 

Snmp snmp = new Snmp(new DefaultUdpTransportMapping()); 
snmp.listen(); 
snmp.sendPDU(request, target, null, listener);

Aruspex

Answer 5

A very good example can be found here:

http://shivasoft.in/blog/java/snmp/create-snmp-client-in-java-using-snmp4j/

Cumulative

But not an example of sending a trap. – Irresolution