org.snmp4j.Snmp Java Examples

public SnmpHelper(String address, String community) {
    _target = new CommunityTarget();
    _target.setCommunity(new OctetString(community));
    _target.setVersion(SnmpConstants.version2c);
    _target.setAddress(new UdpAddress(address));
    try {
        _snmp = new Snmp(new DefaultUdpTransportMapping());
    } catch (IOException e) {
        _snmp = null;
        throw new CloudRuntimeException(" Error in crearting snmp object, " + e.getMessage());
    }
}
 

@Deactivate
public void deactivate(ComponentContext context) {
    for (Map.Entry<Integer, Snmp> entry : portSessionMap.entrySet()) {
        try {
            entry.getValue().close();
        } catch (IOException e) {
            log.warn("Can't close SNMP notification session on Ip {} and Port {}",
                     localIp, entry.getKey(), e);
        }
    }
    mastershipService.addListener(mastershipListener);
    deviceService.removeListener(deviceListener);
    providerRegistry.unregister(this);
    providerService = null;
    log.info("Stopped");
}
 

/**
 * Builds target resource.
 * @param context Process context
 */
private void buildTargetResource(ProcessContext context) {
    if((this.transportMapping == null) || !this.transportMapping.isListening() || (this.snmp == null)) {
        try {
            this.transportMapping = new DefaultUdpTransportMapping();
            this.snmp = new Snmp(this.transportMapping);

            if("SNMPv3".equals(context.getProperty(SNMP_VERSION).getValue())) {
                USM usm = new USM(SecurityProtocols.getInstance(), new OctetString(MPv3.createLocalEngineID()), 0);
                SecurityModels.getInstance().addSecurityModel(usm);
            }

            this.transportMapping.listen();
        } catch (Exception e) {
            throw new IllegalStateException("Failed to initialize UDP transport mapping", e);
        }
    }
    if (this.snmpTarget == null) {
        this.snmpTarget = this.createSnmpTarget(context);
    }
    if (this.targetResource == null) {
        this.targetResource = this.finishBuildingTargetResource(context);
    }
}
 

/**
 * 获取指定OID的 get
 *
 * @param snmp
 * @param target
 * @param oid
 * @return
 * @throws IOException
 */
public static PDU snmpGet(Snmp snmp, Target target, String oid) throws IOException {
    ScopedPDU pdu = new ScopedPDU();
    pdu.setType(PDU.GET);
    pdu.add(new VariableBinding(new OID(oid)));

    ResponseEvent responseEvent = snmp.send(pdu, target);
    PDU response = responseEvent.getResponse();
    if(response == null){
        log.warn("response null - error:{} peerAddress:{} source:{} request:{}",
                responseEvent.getError(),
                responseEvent.getPeerAddress(),
                responseEvent.getSource(),
                responseEvent.getRequest());
    }
    return response;
}
 

public static void sendTrapV2(String port) throws IOException {
    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)));
    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("127.0.0.1/" + port);
    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);

    snmp.close();
}
 

/**
 * 获取指定OID的 get
 *
 * @param snmp
 * @param target
 * @param oid
 * @return
 * @throws IOException
 */
public static PDU snmpGet(Snmp snmp, Target target, String oid) throws IOException {
    ScopedPDU pdu = new ScopedPDU();
    pdu.setType(PDU.GET);
    pdu.add(new VariableBinding(new OID(oid)));

    ResponseEvent responseEvent = snmp.send(pdu, target);
    PDU response = responseEvent.getResponse();
    if(response == null){
        log.warn("response null - error:{} peerAddress:{} source:{} request:{}",
                responseEvent.getError(),
                responseEvent.getPeerAddress(),
                responseEvent.getSource(),
                responseEvent.getRequest());
    }
    return response;
}
 

/**
 * Retrieves static object value.
 *
 * @param handler parent driver handler
 * @param oid object identifier
 * @return the variable
 * @throws IOException if unable to retrieve the object value
 */
public static Variable get(DriverHandler handler, String oid) throws IOException {
    List<VariableBinding> vbs = new ArrayList<>();
    vbs.add(new VariableBinding(new OID(oid)));
    PDU pdu = new PDU(PDU.GET, vbs);
    Snmp session = getSession(handler);
    CommunityTarget target = getTarget(handler);
    ResponseEvent event = session.send(pdu, target);
    return event.getResponse().get(0).getVariable();
}
 

private void createDevice(String ipAddress, int port) throws IOException {
    Address targetAddress = GenericAddress.parse("udp:" + ipAddress + "/" + port);
    TransportMapping transport = new DefaultUdpTransportMapping();
    transport.listen();
    snmp = new Snmp(transport);

    // setting up target
    target = new CommunityTarget();
    target.setCommunity(new OctetString("public"));
    target.setAddress(targetAddress);
    target.setRetries(3);
    target.setTimeout(1000L * 3L);
    target.setVersion(SnmpConstants.version2c);
    target.setMaxSizeRequestPDU(MAX_SIZE_RESPONSE_PDU);
}
 

public static void sendTrapV3(String port) {
    try {
        Address targetAddress = GenericAddress.parse("udp:127.0.0.1/" + port);
        TransportMapping<?> transport = new DefaultUdpTransportMapping();
        Snmp snmp = new Snmp(transport);
        USM usm = new USM(SecurityProtocols.getInstance(), new OctetString(
                MPv3.createLocalEngineID()), 0);
        SecurityModels.getInstance().addSecurityModel(usm);
        transport.listen();

        snmp.getUSM().addUser(new OctetString("MD5DES"),
                new UsmUser(new OctetString("MD5DES"), null, null, null, null));

        // Create Target
        UserTarget target = new UserTarget();
        target.setAddress(targetAddress);
        target.setRetries(1);
        target.setTimeout(11500);
        target.setVersion(SnmpConstants.version3);
        target.setSecurityLevel(SecurityLevel.NOAUTH_NOPRIV);
        target.setSecurityName(new OctetString("MD5DES"));

        // Create PDU for V3
        ScopedPDU pdu = new ScopedPDU();
        pdu.setType(ScopedPDU.NOTIFICATION);
        pdu.add(new VariableBinding(SnmpConstants.sysUpTime));
        pdu.add(new VariableBinding(SnmpConstants.snmpTrapOID, SnmpConstants.linkDown));
        pdu.add(new VariableBinding(new OID("1.2.3.4.5"), new OctetString("Major")));

        // Send the PDU
        snmp.send(pdu, target);

        transport.close();
        snmp.close();
    } catch (Exception e) {
        System.err.println("Error in Sending Trap to (IP:Port)=> " + "127.0.0.1" + ":" + port);
        System.err.println("Exception Message = " + e.getMessage());
    }
}
 

public static void sendTrapV1(String port) throws IOException {

        TransportMapping<?> transport = new DefaultUdpTransportMapping();
        transport.listen();

        CommunityTarget comtarget = new CommunityTarget();
        comtarget.setCommunity(new OctetString(new OctetString("public")));
        comtarget.setVersion(SnmpConstants.version1);
        comtarget.setAddress(new UdpAddress("127.0.0.1/" + port));
        comtarget.setRetries(2);
        comtarget.setTimeout(5000);

        PDU trap = new PDUv1();
        trap.setType(PDU.V1TRAP);

        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)));
        trap.add(new VariableBinding(SnmpConstants.sysDescr, new OctetString("System Description")));

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

        // Send
        Snmp snmp = new Snmp(transport);
        snmp.send(trap, comtarget);
        transport.close();
        snmp.close();

    }
 

/**
 * Start the Snmp session. If you forget the listen() method you will not
 * get any answers because the communication is asynchronous
 * and the listen() method listens for answers.
 * @throws IOException
 */
public void start() throws IOException 
{
	TransportMapping transport = new DefaultUdpTransportMapping();
	snmp = new Snmp(transport);
	if("3".equals(this.version))//add v3 support
	{
		USM usm = new USM(SecurityProtocols.getInstance(), new OctetString(MPv3.createLocalEngineID()), 0);  
		SecurityModels.getInstance().addSecurityModel(usm);  
	}
	// Do not forget this line!
	transport.listen();
}
 

/**
 * 创建SNMPV3会话
 * @param userInfo
 * @throws IOException
 * @throws AgentArgumentException
 */
public SNMPV3Session(SNMPV3UserInfo userInfo) throws IOException, AgentArgumentException {
    if(StringUtils.isEmpty(userInfo.getAddress())){
        throw new AgentArgumentException("SNMPV3Session创建失败:snmp v3协议的访问地址不能为空");
    }
    if(StringUtils.isEmpty(userInfo.getUsername())){
        throw new AgentArgumentException("SNMPV3Session创建失败:snmp v3协议的访问用户名不能为空");
    }
    if(!StringUtils.isEmpty(userInfo.getAythType()) && StringUtils.isEmpty(userInfo.getAuthPswd())){
        throw new AgentArgumentException("SNMPV3Session创建失败:snmp v3协议指定了认证算法 aythType,就必须要指定认证密码");
    }
    if(!StringUtils.isEmpty(userInfo.getPrivType()) && StringUtils.isEmpty(userInfo.getPrivPswd())){
        throw new AgentArgumentException("SNMPV3Session创建失败:snmp v3协议指定了加密算法 privType,就必须要指定加密密码");
    }

    this.userInfo = userInfo;
    snmp = new Snmp(new DefaultUdpTransportMapping());
    USM usm = new USM(SecurityProtocols.getInstance(), new OctetString(MPv3.createLocalEngineID()), 0);
    SecurityModels.getInstance().addSecurityModel(usm);
    snmp.listen();

    UsmUser user = new UsmUser(
            new OctetString(userInfo.getUsername()),
            getAuthProtocol(userInfo.getAythType()), new OctetString(userInfo.getAuthPswd()),
            getPrivProtocol(userInfo.getPrivType()), new OctetString(userInfo.getPrivPswd()));

    snmp.getUSM().addUser(new OctetString(userInfo.getUsername()), user);

    target = new UserTarget();
    target.setSecurityName(new OctetString(userInfo.getUsername()));
    target.setVersion(SnmpConstants.version3);
    target.setSecurityLevel(SecurityLevel.AUTH_PRIV);
    target.setAddress(GenericAddress.parse(userInfo.getProtocol() + ":" + userInfo.getAddress() + "/" + userInfo.getPort()));
    target.setTimeout(8000);
    target.setRetries(1);
}
 

/**
 * walk方式获取指定的oid value
 *
 * @param snmp
 * @param target
 * @param oid
 * @return
 * @throws IOException
 */
public static List<PDU> snmpWalk(Snmp snmp, Target target, String oid) throws IOException {
    List<PDU> pduList = new ArrayList<>();

    ScopedPDU pdu = new ScopedPDU();
    OID targetOID = new OID(oid);
    pdu.add(new VariableBinding(targetOID));

    boolean finished = false;
    while (!finished) {
        VariableBinding vb = null;
        ResponseEvent respEvent = snmp.getNext(pdu, target);

        PDU response = respEvent.getResponse();

        if (null == response) {
            break;
        } else {
            vb = response.get(0);
        }
        // check finish
        finished = checkWalkFinished(targetOID, pdu, vb);
        if (!finished) {
            pduList.add(response);

            // Set up the variable binding for the next entry.
            pdu.setRequestID(new Integer32(0));
            pdu.set(0, vb);
        }
    }

    return pduList;
}
 

@BeforeMethod
public void initSnmpSession() throws IOException {
    snmp = new Snmp(new DefaultUdpTransportMapping());
    snmp.listen();
}
 

public void onResponse(ResponseEvent re) {
       // Always cancel async request when response has been received
       // otherwise a memory leak is created! Not canceling a request
       // immediately can be useful when sending a request to a broadcast
       // address.
       try {
            Object source = re.getSource();

           // test to ignore REPORTS from DISCOVERY messages in SNMPv3
           if (!(source instanceof Snmp)) return;

           ((Snmp) source).cancel(re.getRequest(), this);

           //create the SnmpMsg received
           MsgSnmp msg = new MsgSnmp(listenpoint.getStack());
           msg.setPdu(re.getResponse());
           
           //TODO: how to know the version here to set communityTarget or UserTarget
           Target target = new CommunityTarget();
//           ((CommunityTarget)target).setCommunity(new OctetString(re.getStateReference().getSecurityName()));
           target.setAddress(re.getPeerAddress());
           msg.setTarget((AbstractTarget)target);
           UdpAddress add = (UdpAddress) re.getPeerAddress();
           msg.setRemotePort(add.getPort());
           msg.setRemoteHost(add.getInetAddress().getHostAddress());
           msg.setListenpoint(listenpoint);

           StackFactory.getStack(StackFactory.PROTOCOL_SNMP).receiveMessage(msg);
       } catch (Exception ex) {
       }
    }
 

@Override
public boolean create(String protocol) throws Exception
{
    processMessage = new ProcessMessage(this);
    snmp = new Snmp(new DefaultUdpTransportMapping(new UdpAddress(getHost() + "/" + getPort())));
    snmp.addCommandResponder(processMessage);

    // TEST CODE : initialize for receiving SNMPV3
    {
        String authPassword = stack.getConfig().getString("protocol.authPassword");
        String encryptPassword = stack.getConfig().getString("protocol.encryptPassword");

        snmp.getMessageDispatcher().removeMessageProcessingModel(new MPv3());
        snmp.getMessageDispatcher().addMessageProcessingModel(new MPv3(MPv3.createLocalEngineID(new OctetString(this.getUID()))));

        USM usm = new USM(SecurityProtocols.getInstance(), new OctetString(this.getUID().getBytes()), 0);
        SecurityModels.getInstance().addSecurityModel(usm);

        // need to get a list of users and their params from config
        snmp.getUSM().addUser(new OctetString("MD5DES"),
                new UsmUser(new OctetString("MD5DES"),
                            AuthMD5.ID, new OctetString("protocol.authPassword"),
                            PrivDES.ID, new OctetString("protocol.encryptPassword")));
    }

    snmp.listen();

    return true;
}
 

/**
 * 创建SNMPV3会话
 * @param userInfo
 * @throws IOException
 * @throws AgentArgumentException
 */
public SNMPV3Session(SNMPV3UserInfo userInfo) throws IOException, AgentArgumentException {
    if(StringUtils.isEmpty(userInfo.getAddress())){
        throw new AgentArgumentException("SNMPV3Session创建失败:snmp v3协议的访问地址不能为空");
    }
    if(StringUtils.isEmpty(userInfo.getUsername())){
        throw new AgentArgumentException("SNMPV3Session创建失败:snmp v3协议的访问用户名不能为空");
    }
    if(!StringUtils.isEmpty(userInfo.getAythType()) && StringUtils.isEmpty(userInfo.getAuthPswd())){
        throw new AgentArgumentException("SNMPV3Session创建失败:snmp v3协议指定了认证算法 aythType,就必须要指定认证密码");
    }
    if(!StringUtils.isEmpty(userInfo.getPrivType()) && StringUtils.isEmpty(userInfo.getPrivPswd())){
        throw new AgentArgumentException("SNMPV3Session创建失败:snmp v3协议指定了加密算法 privType,就必须要指定加密密码");
    }

    this.userInfo = userInfo;
    snmp = new Snmp(new DefaultUdpTransportMapping());
    USM usm = new USM(SecurityProtocols.getInstance(), new OctetString(MPv3.createLocalEngineID(
            new OctetString(HostUtil.getHostIp() + UUID.randomUUID().toString())
    )), 0);
    SecurityModels.getInstance().addSecurityModel(usm);
    snmp.listen();

    UsmUser user = new UsmUser(
            new OctetString(userInfo.getUsername()),
            getAuthProtocol(userInfo.getAythType()), new OctetString(userInfo.getAuthPswd()),
            getPrivProtocol(userInfo.getPrivType()), new OctetString(userInfo.getPrivPswd()));

    snmp.getUSM().addUser(new OctetString(userInfo.getUsername()), user);

    target = new UserTarget();
    target.setSecurityName(new OctetString(userInfo.getUsername()));
    target.setVersion(SnmpConstants.version3);
    target.setSecurityLevel(SecurityLevel.AUTH_PRIV);
    target.setAddress(GenericAddress.parse(userInfo.getProtocol() + ":" + userInfo.getAddress() + "/" + userInfo.getPort()));
    target.setTimeout(TIMEOUT);
    target.setRetries(1);
}
 

/**
 * walk方式获取指定的oid value
 *
 * @param snmp
 * @param target
 * @param oid
 * @return
 * @throws IOException
 */
public static List<PDU> snmpWalk(Snmp snmp, Target target, String oid) throws IOException {
    List<PDU> pduList = new ArrayList<>();

    ScopedPDU pdu = new ScopedPDU();
    OID targetOID = new OID(oid);
    pdu.add(new VariableBinding(targetOID));

    boolean finished = false;
    while (!finished) {
        VariableBinding vb = null;
        ResponseEvent respEvent = snmp.getNext(pdu, target);

        PDU response = respEvent.getResponse();

        if (null == response) {
            break;
        } else {
            vb = response.get(0);
        }
        // check finish
        finished = checkWalkFinished(targetOID, pdu, vb);
        if (!finished) {
            pduList.add(response);

            // Set up the variable binding for the next entry.
            pdu.setRequestID(new Integer32(0));
            pdu.set(0, vb);
        }
    }

    return pduList;
}
 

public static List<TableEvent> getResponse(final OID query, int port, final String community) throws Exception {
    final Address targetAddress = GenericAddress.parse(String.format("127.0.0.1/%d", port));
    final Snmp snmp = new Snmp(new DefaultUdpTransportMapping());
    snmp.listen();

    final CommunityTarget target = getCommunityTarget(community, targetAddress);

    // creating PDU
    final PDUFactory pduFactory = new DefaultPDUFactory(PDU.GETBULK);
    final TableUtils utils = new TableUtils(snmp, pduFactory);

    return utils.getTable(target, new OID[]{query}, null, null);
}
 

/**
 * Builds target resource.
 * @param context Process context
 */
private void buildTargetResource(ProcessContext context) {
    if((this.transportMapping == null) || !this.transportMapping.isListening() || (this.snmp == null)) {
        try {
            this.transportMapping = new DefaultUdpTransportMapping();
            this.snmp = new Snmp(this.transportMapping);

            if("SNMPv3".equals(context.getProperty(SNMP_VERSION).getValue())) {
                USM usm = new USM(SecurityProtocols.getInstance(), new OctetString(MPv3.createLocalEngineID()), 0);
                SecurityModels.getInstance().addSecurityModel(usm);
            }

            this.transportMapping.listen();
        } catch (Exception e) {
            throw new IllegalStateException("Failed to initialize UDP transport mapping", e);
        }
    }
    if (this.snmpTarget == null) {
        this.snmpTarget = this.createSnmpTarget(context);
    }
    if (this.targetResource == null) {
        this.targetResource = this.finishBuildingTargetResource(context);
    }
}
 

/**
 * Called when a response from a GET is received
 *
 * @see org.snmp4j.event.ResponseListener#onResponse(org.snmp4j.event.ResponseEvent )
 */
@Override
public void onResponse(ResponseEvent event) {
    // Always cancel async request when response has been received
    // otherwise a memory leak is created! Not canceling a request
    // immediately can be useful when sending a request to a broadcast
    // address.
    ((Snmp) event.getSource()).cancel(event.getRequest(), this);

    dispatchPdu(event.getPeerAddress(), event.getResponse());
}
 

/**
 * Method to prepare user target and to add id in the User Based Security Model of the given SNMP instance
 * @param snmp SNMP instance
 * @param address address
 * @param securityLevel security level
 * @param securityName security name
 * @param auth authentication protocol
 * @param priv private protocol
 * @param authPwd authentication password
 * @param privPwd private password
 * @return user target
 */
protected static UserTarget prepareUser(Snmp snmp, String address, int securityLevel, String securityName, OID auth, OID priv, String authPwd, String privPwd) {
    snmp.getUSM().removeAllUsers();
    OctetString aPwd = authPwd != null ? new OctetString(authPwd) : null;
    OctetString pPwd = privPwd != null ? new OctetString(privPwd) : null;
    snmp.getUSM().addUser(new OctetString(securityName), new UsmUser(new OctetString(securityName), auth, aPwd, priv, pPwd));
    return createUserTarget(address, securityLevel, securityName);
}
 

@Override
public Snmp getSession() {
    return session;
}
 

/**
 * Sends a synchronous SET request to the supplied target.
 *
 * @param handler parent driver handler
 * @param vbs a list of variable bindings
 * @return the response event
 * @throws IOException if unable to set the target
 */
public static ResponseEvent set(DriverHandler handler, List<? extends VariableBinding> vbs) throws IOException {
    Snmp session = getSession(handler);
    CommunityTarget target = getTarget(handler);
    PDU pdu = new PDU(PDU.SET, vbs);
    return session.set(pdu, target);
}
 

public static void sendTrapV3Auth(String port) throws IOException {
    try {
        Address targetAddress = GenericAddress.parse("udp:127.0.0.1/" + port);
        TransportMapping<?> transport = new DefaultUdpTransportMapping();
        Snmp snmp = new Snmp(transport);
        USM usm = new USM(SecurityProtocols.getInstance(), new OctetString(
                MPv3.createLocalEngineID()), 0);
        SecurityModels.getInstance().addSecurityModel(usm);
        transport.listen();

        snmp.getUSM().addUser(
                new OctetString("user"),
                new UsmUser(new OctetString("user"), AuthMD5.ID, new OctetString("12345678"),
                        null, null));

        // Create Target
        UserTarget target = new UserTarget();
        target.setAddress(targetAddress);
        target.setRetries(1);
        target.setTimeout(11500);
        target.setVersion(SnmpConstants.version3);
        target.setSecurityLevel(SecurityLevel.AUTH_NOPRIV);
        target.setSecurityName(new OctetString("user"));

        // Create PDU for V3
        ScopedPDU pdu = new ScopedPDU();
        pdu.setType(ScopedPDU.NOTIFICATION);
        pdu.add(new VariableBinding(SnmpConstants.sysUpTime));
        pdu.add(new VariableBinding(SnmpConstants.snmpTrapOID, SnmpConstants.linkDown));
        pdu.add(new VariableBinding(new OID("1.2.3.4.5"), new OctetString("Major")));

        // Send the PDU
        snmp.send(pdu, target);

        transport.close();
        snmp.close();
    } catch (Exception e) {
        System.err.println("Error in Sending Trap to (IP:Port)=> " + "127.0.0.1" + ":" + port);
        System.err.println("Exception Message = " + e.getMessage());
    }
}
 

/**
 * Retrieves a table.
 *
 * @param handler parent driver handler
 * @param columnOIDs column oid object identifiers
 * @return the table
 * @throws IOException if unable to retrieve the object value
 */
public static List<TableEvent> getTable(DriverHandler handler, OID[] columnOIDs) throws IOException {
    Snmp session = getSession(handler);
    CommunityTarget target = getTarget(handler);
    TableUtils tableUtils = new TableUtils(session, new DefaultPDUFactory());
    return tableUtils.getTable(target, columnOIDs, null, null);
}
 

private static Snmp getSession(DriverHandler handler) {
    Snmp session = getDevice(handler).getSession();
    return session;
}
 

public static void sendTrapV3AuthPriv(String port) throws IOException {
    try {
        Address targetAddress = GenericAddress.parse("udp:127.0.0.1/" + port);
        TransportMapping<?> transport = new DefaultUdpTransportMapping();
        Snmp snmp = new Snmp(transport);
        USM usm = new USM(SecurityProtocols.getInstance(), new OctetString(
                MPv3.createLocalEngineID()), 0);
        SecurityModels.getInstance().addSecurityModel(usm);
        transport.listen();

        snmp.getUSM().addUser(
                new OctetString("user"),
                new UsmUser(new OctetString("user"), AuthMD5.ID, new OctetString("12345678"),
                        PrivDES.ID, new OctetString("passphrase")));

        // Create Target
        UserTarget target = new UserTarget();
        target.setAddress(targetAddress);
        target.setRetries(1);
        target.setTimeout(11500);
        target.setVersion(SnmpConstants.version3);
        target.setSecurityLevel(SecurityLevel.AUTH_NOPRIV);
        target.setSecurityName(new OctetString("user"));

        // Create PDU for V3
        ScopedPDU pdu = new ScopedPDU();
        pdu.setType(ScopedPDU.NOTIFICATION);
        pdu.add(new VariableBinding(SnmpConstants.sysUpTime));
        pdu.add(new VariableBinding(SnmpConstants.snmpTrapOID, SnmpConstants.linkDown));
        pdu.add(new VariableBinding(new OID("1.2.3.4.5"), new OctetString("Major")));

        // Send the PDU
        snmp.send(pdu, target);

        transport.close();
        snmp.close();
    } catch (Exception e) {
        System.err.println("Error in Sending Trap to (IP:Port)=> " + "127.0.0.1" + ":" + port);
        System.err.println("Exception Message = " + e.getMessage());
    }
}
 

/**
 * Method to create an instance of SNMP
 * @return instance of SNMP
 * @throws IOException IO Exception
 */
protected static Snmp createSnmp() throws IOException {
    DefaultUdpTransportMapping transportMapping = new DefaultUdpTransportMapping();
    transportMapping.listen();
    return new Snmp(transportMapping);
}
 

/**
 * Sends a SET request.
 *
 * @param handler parent driver handler
 * @param pdu SNMP protocol data unit
 * @return the response event
 * @throws IOException if unable to send a set request
 */
public static ResponseEvent set(DriverHandler handler, PDU pdu) throws IOException {
    Snmp session = getSession(handler);
    CommunityTarget target = getTarget(handler);
    return session.set(pdu, target);
}