private ResponseEvent snmpGet(String targetOid) throws IOException {
PDU pdu = new PDU();
pdu.add(new VariableBinding(new OID(targetOid)));
pdu.setType(PDU.GET);
// send the PDU
return snmp.send(pdu, target);
}
private void notifyResponse(ResponseEvent response, String targetOid) {
if (response == null) {
for (ResponseHandler responseHandler : responseHandlers) {
responseHandler.onTimeout(targetOid);
}
} else {
PDU responsePDU = response.getResponse();
int errorStatus = responsePDU.getErrorStatus();
int errorIndex = responsePDU.getErrorIndex();
String errorStatusText = responsePDU.getErrorStatusText();
switch (errorStatus) {
case SnmpConstants.SNMP_ERROR_SUCCESS:
for (ResponseHandler responseHandler : responseHandlers) {
responseHandler.onSuccess(targetOid);
}
break;
default:
if (log.isDebugEnabled()) {
log.debug("Error: Request Failed");
log.debug("Error Status = " + errorStatus);
log.debug("Error Index = " + errorIndex);
log.debug("Error Status Text = " + errorStatusText);
}
for (ResponseHandler responseHandler : responseHandlers) {
responseHandler.onError(targetOid, errorStatus, errorStatusText);
}
break;
}
}
}
/**
* This method is capable of handling multiple OIDs
*
* @param oids
* @return
* @throws IOException
*/
public ResponseEvent get(OID... oids) throws IOException {
PDU pdu = new PDU();
for (OID oid : oids) {
pdu.add(new VariableBinding(oid));
}
pdu.setType(PDU.GET);
ResponseEvent event = snmp.send(pdu, getTarget(), null);
if (event != null) {
return event;
}
throw new RuntimeException("GET timed out");
}
public void updateByValue(
URI url, List<Variable> values, SnmpUriCallback callback, Object userObject)
throws UnknownHostException {
Request request = createSnmpRequest(url);
PDU pdu = request.getPdu();
pdu.setType(PDU.SET);
OID[] oids = request.getOIDs();
for (int i = 0; i < oids.length && i < values.size(); i++) {
pdu.add(new VariableBinding(oids[i], values.get(i)));
}
sendSnmpRequest(request, pdu, url, callback, userObject);
}
public void sendByBinding(
URI url,
List<VariableBinding> values,
int pduType,
SnmpUriCallback callback,
Object userObject)
throws UnknownHostException {
Request request = createSnmpRequest(url);
PDU pdu = request.getPdu();
pdu.setType(pduType);
for (VariableBinding vb : values) {
pdu.add(vb);
}
sendSnmpRequest(request, pdu, url, callback, userObject);
}
public void snmpWalk(String oidFrom) throws SnmpException {
PDU request = new PDU();
request.setType(PDU.GETNEXT);
request.add(new VariableBinding(new OID(oidFrom)));
request.setNonRepeaters(0);
OID rootOID = request.get(0).getOid();
PDU response = null;
int objects = 0;
int requests = 0;
long startTime = System.currentTimeMillis();
try {
Snmp snmp = new Snmp(new DefaultUdpTransportMapping());
snmp.listen();
m_sessionDestroyed = false;
do {
requests++;
ResponseEvent responseEvent = snmp.send(request, getTarget(getReadCommunity()));
response = responseEvent.getResponse();
if (response != null) {
objects += response.size();
}
} while (!processWalk(response, request, rootOID) && !m_sessionDestroyed);
} catch (SnmpException e) {
throw e;
} catch (Exception e) {
e.printStackTrace();
throw new SnmpException(e.getMessage());
}
if (m_snmpResponseHandler != null) {
m_snmpResponseHandler.requestStats(requests, objects, System.currentTimeMillis() - startTime);
}
}
@Override
public void onResponse(ResponseEvent event) {
SnmpUriResponse response = new SnmpUriResponse(SnmpUriResponse.Type.TIMEOUT);
PDU responsePDU = event.getResponse();
if (responsePDU != null) {
if (responsePDU.getErrorStatus() != PDU.noError) {
response = new SnmpUriResponse(responsePDU.getErrorStatus());
} else {
response =
new SnmpUriResponse(
Collections.singletonList(
responsePDU
.getVariableBindings()
.toArray(new VariableBinding[responsePDU.size()])));
}
}
callback.onResponse(response, url, event.getUserObject());
}
/**
* Method which takes a single OID and returns the response from the agent as a String.
*
* @param oid
* @return
* @throws IOException
*/
public String getAsString(OID... oid) throws IOException {
// ResponseEvent event = get(new OID[]{oid});
// return event.getResponse().get(0).getVariable().toString();
ResponseEvent event = get(oid);
PDU response = event.getResponse();
int size = oid.length;
// VariableBinding variableBinding=response.get(0);
// Variable variable=variableBinding.getVariable();
// String varStirng=variable.toString();
// return varStirng;
StringBuilder builder = new StringBuilder();
for (int i = 0; i < size; i++) {
VariableBinding variableBinding = response.get(i);
Variable variable = variableBinding.getVariable();
String varStirng = variable.toString();
String oi = variableBinding.getOid().toString();
builder.append("oid: ").append(oi).append(" var: ").append(varStirng).append("\n");
}
return builder.toString();
}
void snmpSetValue(String oid, int syntax, String value) throws SnmpException {
VariableBinding varbind = getVarBindForSetRequest(oid, syntax, value);
PDU request = new PDU();
request.setType(PDU.SET);
request.add(varbind);
PDU response = null;
long startTime = System.currentTimeMillis();
try {
Snmp snmp = new Snmp(new DefaultUdpTransportMapping());
snmp.listen();
ResponseEvent responseEvent = snmp.send(request, getTarget(getWriteCommunity()));
response = responseEvent.getResponse();
// System.out.println(response);
} catch (Exception e) {
e.printStackTrace();
throw new SnmpException(e.getMessage());
}
}
public void browse(URI url, SnmpUriCallback callback, Object userObject)
throws UnknownHostException {
Request request = createSnmpRequest(url);
PDU pdu = request.getPdu();
switch (request.getType()) {
case GET:
pdu.setType(PDU.GET);
pdu.addAll(VariableBinding.createFromOIDs(request.getOIDs()));
sendSnmpRequest(request, pdu, url, callback, userObject);
break;
case NEXT:
pdu.setType(PDU.GETNEXT);
pdu.addAll(VariableBinding.createFromOIDs(request.getOIDs()));
sendSnmpRequest(request, pdu, url, callback, userObject);
break;
case SUBTREE:
TreeUtils treeUtils = new TreeUtils(snmp, pduFactory);
TreeListener treeListener = new AsyncTreeListener(url, callback);
treeUtils.walk(request.getTarget(), request.getOIDs(), userObject, treeListener);
break;
}
}
private boolean processWalk(PDU response, PDU request, OID rootOID) throws SnmpException {
if ((response == null)
|| (response.getErrorStatus() != 0)
|| (response.getType() == PDU.REPORT)) {
return true;
}
boolean finished = false;
OID lastOID = request.get(0).getOid();
for (int i = 0; (!finished) && (i < response.size()); i++) {
VariableBinding vb = response.get(i);
if ((vb.getOid() == null)
|| (vb.getOid().size() < rootOID.size())
|| (rootOID.leftMostCompare(rootOID.size(), vb.getOid()) != 0)) {
finished = true;
} else if (Null.isExceptionSyntax(vb.getVariable().getSyntax())) {
outputResponse(vb);
finished = true;
} else if (vb.getOid().compareTo(lastOID) <= 0) {
throw new SnmpException(
"Variable received is not lexicographic successor of requested one:"
+ vb.toString()
+ " <= "
+ lastOID);
} else {
outputResponse(vb);
lastOID = vb.getOid();
}
}
if (response.size() == 0) {
finished = true;
}
if (!finished) {
VariableBinding next = response.get(response.size() - 1);
next.setVariable(new Null());
request.set(0, next);
request.setRequestID(new Integer32(0));
}
return finished;
}
/**
* Read a variable saved into @DriverConfiguration object
*
* @param propertyConfiguration driver configuration object
* @throws GenericException if configuration fatal error
*/
@Override
public void readValue(DriverConfiguration propertyConfiguration) throws GenericException {
try {
ResponseEvent response = snmpGet(String.valueOf(propertyConfiguration.getValue()));
if (response != null) {
if (log.isDebugEnabled()) {
log.debug("Got Snmp Get Response from Agent");
}
PDU responsePDU = response.getResponse();
if (responsePDU != null) {
int errorStatus = responsePDU.getErrorStatus();
if (errorStatus == PDU.noError) {
Vector<? extends VariableBinding> variableBindings = responsePDU.getVariableBindings();
if (log.isDebugEnabled()) {
log.debug(String.format("Snmp Get Response = %s", variableBindings));
}
VariableBinding variableBinding = variableBindings.get(0);
Variable variable = variableBinding.getVariable();
Object value = convert(variable, getValueType(variable));
setValue(propertyConfiguration, value);
} else {
notifyResponse(response, propertyConfiguration.getName());
}
} else {
if (log.isDebugEnabled()) {
log.debug("Error: Response PDU is null");
}
}
} else {
notifyResponse(response, propertyConfiguration.getName());
}
} catch (Exception e) {
throw new GenericException(e);
}
}