org.snmp4j.Target Java Examples

/**
* This method returns a Target, which contains information about
* where the data should be fetched and how.
* @return
*/
private Target getTarget() {
	if("3".equals(this.version))return getTargetV3();
	Address targetAddress = GenericAddress.parse(address);
	CommunityTarget target = new CommunityTarget();
	//logger.info("snmp version "+this.version+", community: "+this.community);
	if(this.community == null || this.community.isEmpty())
		target.setCommunity(new OctetString("public"));
	else 
		target.setCommunity(new OctetString(this.community));
	target.setAddress(targetAddress);
	target.setRetries(2);
	target.setTimeout(5000);
	target.setVersion(this.getVersionInt());
	return target;
}
 

private Target getTargetV3() {
	//logger.info("Use SNMP v3, "+this.privacyprotocol +"="+this.password+", "+this.privacyprotocol+"="+this.privacypassphrase);
	OID authOID = AuthMD5.ID;
	if("SHA".equals(this.authprotocol))
		authOID = AuthSHA.ID;
	OID privOID = PrivDES.ID;
	if(this.privacyprotocol == null || this.privacyprotocol.isEmpty())
		privOID = null;
	UsmUser user = new UsmUser(new OctetString(this.username),  
			authOID, new OctetString(this.password),  //auth
			privOID, this.privacypassphrase!=null?new OctetString(this.privacypassphrase):null); //enc
	snmp.getUSM().addUser(new OctetString(this.username), user);  
	Address targetAddress = GenericAddress.parse(address);
	UserTarget target = new UserTarget();
	target.setAddress(targetAddress);
	target.setRetries(2);
	target.setTimeout(1500);
	target.setVersion(this.getVersionInt());
	if(privOID != null)
		target.setSecurityLevel(SecurityLevel.AUTH_PRIV);  
	else
		target.setSecurityLevel(SecurityLevel.AUTH_NOPRIV); 
	target.setSecurityName(new OctetString(this.username));
	return target;
}
 

/**
 * 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;
}
 

/**
 * 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;
}
 

/**
 * 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 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) {
       }
    }
 

/**
 * 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;
}
 

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

    ResponseEvent responseEvent = snmp.send(pdu, target);
    return responseEvent.getResponse();
}
 

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

    ResponseEvent responseEvent = snmp.send(pdu, target);
    return responseEvent.getResponse();
}