Interview Questions

Snmp4j - Snmp Set Example

SnmpSetExample

/**
 * Copyright 2010 TechDive.in
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 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
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 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
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 * See the License for the specific language governing permissions and
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package in.techdive.snmp4j.ex;

import org.snmp4j.CommunityTarget;
import org.snmp4j.PDU;
import org.snmp4j.Snmp;
import org.snmp4j.TransportMapping;
import org.snmp4j.event.ResponseEvent;
import org.snmp4j.mp.SnmpConstants;
import org.snmp4j.smi.Integer32;
import org.snmp4j.smi.OID;
import org.snmp4j.smi.OctetString;
import org.snmp4j.smi.UdpAddress;
import org.snmp4j.smi.Variable;
import org.snmp4j.smi.VariableBinding;
import org.snmp4j.transport.DefaultUdpTransportMapping;

public class SnmpSetExample
{
  private static String  ipAddress  = "127.0.0.1";

  private static String  port    = "8001";

  // sysContact OID of MIB RFC 1213; Scalar Object = .iso.org.dod.internet.mgmt.mib-2.system.sysContact.0
  private static String  sysContactOid  = ".1.3.6.1.2.1.1.4.0";  // ends with 0 for scalar object

  private static String  sysContactValue  = "TechDive.in";
 
  private static int    snmpVersion  = SnmpConstants.version1;

  private static String  community  = "public";

  public static void main(String[] args) throws Exception
  {

    System.out.println("SNMP SET Demo");

    // Create TransportMapping and Listen
    TransportMapping transport = new DefaultUdpTransportMapping();
    transport.listen();

    // Create Target Address object
    CommunityTarget comtarget = new CommunityTarget();
    comtarget.setCommunity(new OctetString(community));
    comtarget.setVersion(snmpVersion);
    comtarget.setAddress(new UdpAddress(ipAddress + "/" + port));
    comtarget.setRetries(2);
    comtarget.setTimeout(1000);

    // Create the PDU object
    PDU pdu = new PDU();
   
    // Setting the Oid and Value for sysContact variable
    OID oid = new OID(sysContactOid);
    Variable var = new OctetString(sysContactValue);
    VariableBinding varBind = new VariableBinding(oid,var);
    pdu.add(varBind);
   
    pdu.setType(PDU.SET);
    pdu.setRequestID(new Integer32(1));

    // Create Snmp object for sending data to Agent
    Snmp snmp = new Snmp(transport);

    System.out.println("\nRequest:\n[ Note: Set Request is sent for sysContact oid in RFC 1213 MIB.");
    System.out.println("Set operation will change the sysContact value to " + sysContactValue );
    System.out.println("Once this operation is completed, Querying for sysContact will get the value = " + sysContactValue + " ]");
   
    System.out.println("Request:\nSending Snmp Set Request to Agent...");
    ResponseEvent response = snmp.set(pdu, comtarget);

    // Process Agent Response
    if (response != null)
    {
      System.out.println("\nResponse:\nGot Snmp Set Response from Agent");
      PDU responsePDU = response.getResponse();

      if (responsePDU != null)
      {
        int errorStatus = responsePDU.getErrorStatus();
        int errorIndex = responsePDU.getErrorIndex();
        String errorStatusText = responsePDU.getErrorStatusText();

        if (errorStatus == PDU.noError)
        {
          System.out.println("Snmp Set Response = " + responsePDU.getVariableBindings());
        }
        else
        {
          System.out.println("Error: Request Failed");
          System.out.println("Error Status = " + errorStatus);
          System.out.println("Error Index = " + errorIndex);
          System.out.println("Error Status Text = " + errorStatusText);
        }
      }
      else
      {
        System.out.println("Error: Response PDU is null");
      }
    }
    else
    {
      System.out.println("Error: Agent Timeout... ");
    }
    snmp.close();
  }
}

OutputSNMP SET Demo

Request:
[ Note: Set Request is sent for sysContact oid in RFC 1213 MIB.
Set operation will change the sysContact value to TechDive.in
Once this operation is completed, Querying for sysContact will get the value = TechDive.in ]
Request:
Sending Snmp Set Request to Agent...

Response:
Got Snmp Set Response from Agent
Snmp Set Response = [1.3.6.1.2.1.1.4.0 = TechDive.in]