/**
* This method determines whether the inform request is to be retried. This is used if the peer
* did not respond to a previous request. If the request exceeds the maxTries limit, a timeout is
* signaled.
*/
void action() {
if (inProgress() == false) return;
while (true) {
try {
if (numTries == 0) {
invokeOnReady();
} else if (numTries < getMaxTries()) {
invokeOnRetry();
} else {
invokeOnTimeout();
}
return;
} catch (OutOfMemoryError omerr) {
// Consider it as a try !
//
numTries++;
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINEST)) {
SNMP_ADAPTOR_LOGGER.logp(
Level.FINEST,
SnmpInformRequest.class.getName(),
"action",
"Inform request hit out of memory situation...");
}
Thread.currentThread().yield();
}
}
}
/** For SNMP Runtime internal use only. */
final void processResponse() {
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINER)) {
SNMP_ADAPTOR_LOGGER.logp(
Level.FINER,
SnmpInformRequest.class.getName(),
"processResponse",
"errstatus = " + errorStatus);
}
if (inProgress() == false) { // check if this request is still alive.
responsePdu = null;
return; // the request may have cancelled.
}
if (errorStatus >= snmpReqInternalError) {
handleInternalError("Internal Error...");
return;
}
try {
parsePduPacket(responsePdu);
// responsePdu = null;
// At this point the errorIndex is rationalized to start with 0.
switch (errorStatus) {
case snmpRspNoError:
handleSuccess();
return;
case snmpReqTimeout:
handleTimeout();
return;
case snmpReqInternalError:
handleInternalError("Unknown internal error. deal with it later!");
return;
case snmpReqHandleTooBig:
setErrorStatusAndIndex(snmpRspTooBig, 0);
handleError("Cannot handle too-big situation...");
return;
case snmpReqRefireAfterVbFix:
// Refire request after fixing varbindlist.
initializeAndFire();
return;
default:
handleError("Error status set in packet...!!");
return;
}
} catch (Exception e) {
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINEST)) {
SNMP_ADAPTOR_LOGGER.logp(
Level.FINEST,
SnmpInformRequest.class.getName(),
"processResponse",
"Got unexpected exception",
e);
}
reason = e.getMessage();
}
handleInternalError(reason);
}
/** For SNMP Runtime internal use only. */
final void setRequestSentTime(long sendtime) {
numTries++;
setPrevPollTime(sendtime);
waitTimeForResponse = prevPollTime + timeout * numTries;
setRequestStatus(stWaitingForReply);
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINER)) {
SNMP_ADAPTOR_LOGGER.logp(
Level.FINER,
SnmpInformRequest.class.getName(),
"setRequestSentTime",
"Inform request Successfully sent");
}
informSession.getSnmpQManager().addWaiting(this);
}
/**
* Checks if a <CODE>set</CODE> operation can be performed. If the operation can not be performed,
* the method should emit a <CODE>SnmpStatusException</CODE>.
*
* @param inRequest The SnmpMibRequest object holding the list of variables to be set. This list
* is composed of <CODE>SnmpVarBind</CODE> objects.
* @exception SnmpStatusException The <CODE>set</CODE> operation cannot be performed.
*/
@Override
public void check(SnmpMibRequest inRequest) throws SnmpStatusException {
SNMP_ADAPTOR_LOGGER.logp(
Level.FINEST, SnmpErrorHandlerAgent.class.getName(), "check", "Check in Exception");
throw new SnmpStatusException(SnmpDefinitions.snmpRspNotWritable);
}
/**
* Processes a <CODE>set</CODE> operation. Should never be called (check previously called having
* failed).
*
* @param inRequest The SnmpMibRequest object holding the list of variable to be set.
* @exception SnmpStatusException An error occurred during the operation.
*/
@Override
public void set(SnmpMibRequest inRequest) throws SnmpStatusException {
SNMP_ADAPTOR_LOGGER.logp(
Level.FINEST,
SnmpErrorHandlerAgent.class.getName(),
"set",
"Set in Exception, CANNOT be called");
throw new SnmpStatusException(SnmpDefinitions.snmpRspNotWritable);
}
/**
* Parses the inform response packet. If the agent responds with error set, it does not parse any
* further.
*/
synchronized void parsePduPacket(SnmpPduRequestType rpdu) {
if (rpdu == null) return;
errorStatus = rpdu.getErrorStatus();
errorIndex = rpdu.getErrorIndex();
if (errorStatus == snmpRspNoError) {
updateInternalVarBindWithResult(((SnmpPdu) rpdu).varBindList);
return;
}
if (errorStatus != snmpRspNoError) --errorIndex; // rationalize for index to start with 0.
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINER)) {
SNMP_ADAPTOR_LOGGER.logp(
Level.FINER,
SnmpInformRequest.class.getName(),
"parsePduPacket",
"received inform response. ErrorStatus/ErrorIndex = " + errorStatus + "/" + errorIndex);
}
}
/**
* Sends the prepared PDU packet to the manager and updates the data structure to expect a
* response. It acquires a lock on the socket to prevent a case where a response arrives before
* this thread could insert the request into the wait queue.
*
* @exception IOException Signals that an I/O exception of some sort has occurred.
*/
final void sendPduPacket(byte[] buffer, int length) throws java.io.IOException {
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINER)) {
SNMP_ADAPTOR_LOGGER.logp(
Level.FINER,
SnmpInformRequest.class.getName(),
"sendPduPacket",
"Send to peer. Peer/Port : "
+ address.getHostName()
+ "/"
+ port
+ ". Length = "
+ length
+ "\nDump : \n"
+ SnmpMessage.dumpHexBuffer(buffer, 0, length));
}
SnmpSocket theSocket = informSession.getSocket();
synchronized (theSocket) {
theSocket.sendPacket(buffer, length, address, port);
setRequestSentTime(System.currentTimeMillis());
}
}
/** SNMP V1/V2 . To be called with updateRequest. */
protected SnmpSubRequestHandler(SnmpMibAgent agent, SnmpPdu req) {
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINER)) {
SNMP_ADAPTOR_LOGGER.logp(
Level.FINER,
SnmpSubRequestHandler.class.getName(),
"constructor",
"creating instance for request " + String.valueOf(req.requestId));
}
version = req.version;
type = req.type;
this.agent = agent;
// We get a ref on the pdu in order to pass it to SnmpMibRequest.
reqPdu = req;
// Pre-allocate room for storing varbindlist and translation table.
//
int length = req.varBindList.length;
translation = new int[length];
varBind = new NonSyncVector<SnmpVarBind>(length);
}
/**
* The method updates a given var bind list with the result of a previsouly invoked operation.
* Prior to calling the method, one must make sure that the operation was successful. As such the
* method getErrorIndex or getErrorStatus should be called.
*/
protected void updateResult(SnmpVarBind[] result) {
if (result == null) return;
final int max = varBind.size();
final int len = result.length;
for (int i = 0; i < max; i++) {
// bugId 4641694: must check position in order to avoid
// ArrayIndexOutOfBoundException
final int pos = translation[i];
if (pos < len) {
result[pos] = (SnmpVarBind) ((NonSyncVector) varBind).elementAtNonSync(i);
} else {
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINEST)) {
SNMP_ADAPTOR_LOGGER.logp(
Level.FINEST,
SnmpSubRequestHandler.class.getName(),
"updateResult",
"Position `" + pos + "' is out of bound...");
}
}
}
}
/**
* Processes a <CODE>get</CODE> operation. It will throw an exception for V1 requests or it will
* set exceptions within the list for V2 requests.
*
* @param inRequest The SnmpMibRequest object holding the list of variable to be retrieved.
* @exception SnmpStatusException An error occurred during the operation.
*/
@Override
public void get(SnmpMibRequest inRequest) throws SnmpStatusException {
SNMP_ADAPTOR_LOGGER.logp(
Level.FINEST, SnmpErrorHandlerAgent.class.getName(), "get", "Get in Exception");
if (inRequest.getVersion() == SnmpDefinitions.snmpVersionOne)
throw new SnmpStatusException(SnmpStatusException.noSuchName);
Enumeration<SnmpVarBind> l = inRequest.getElements();
while (l.hasMoreElements()) {
SnmpVarBind varbind = l.nextElement();
varbind.setNoSuchObject();
}
}
/** Constructs an inform request PDU. */
synchronized SnmpPdu constructPduPacket() {
SnmpPduPacket reqpdu = null;
Exception excep = null;
try {
reqpdu = new SnmpPduRequest();
reqpdu.port = port;
reqpdu.type = pduInformRequestPdu;
reqpdu.version = snmpVersionTwo;
reqpdu.community = communityString.getBytes("8859_1");
reqpdu.requestId = getRequestId();
reqpdu.varBindList = internalVarBind;
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINER)) {
SNMP_ADAPTOR_LOGGER.logp(
Level.FINER, SnmpInformRequest.class.getName(), "constructPduPacket", "Packet built");
}
} catch (Exception e) {
excep = e;
errorStatus = snmpReqUnknownError;
reason = e.getMessage();
}
if (excep != null) {
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINEST)) {
SNMP_ADAPTOR_LOGGER.logp(
Level.FINEST,
SnmpInformRequest.class.getName(),
"constructPduPacket",
"Got unexpected exception",
excep);
}
reqpdu = null;
queueResponse();
}
return reqpdu;
}
/**
* Processes a <CODE>getBulk</CODE> operation. It will throw an exception if the request is a V1
* one or it will set exceptions within the list for V2 ones.
*
* @param inRequest The SnmpMibRequest object holding the list of variable to be retrieved.
* @exception SnmpStatusException An error occurred during the operation.
*/
@Override
public void getBulk(SnmpMibRequest inRequest, int nonRepeat, int maxRepeat)
throws SnmpStatusException {
SNMP_ADAPTOR_LOGGER.logp(
Level.FINEST, SnmpErrorHandlerAgent.class.getName(), "getBulk", "GetBulk in Exception");
if (inRequest.getVersion() == SnmpDefinitions.snmpVersionOne)
throw new SnmpStatusException(SnmpDefinitions.snmpRspGenErr, 0);
Enumeration<SnmpVarBind> l = inRequest.getElements();
while (l.hasMoreElements()) {
SnmpVarBind varbind = l.nextElement();
varbind.setEndOfMibView();
}
}
/** Calls the user implementation of the <CODE>SnmpInformHandler</CODE> interface. */
private void handleInternalError(String msg) {
setRequestStatus(stInternalError);
if (reason == null) reason = msg;
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINEST)) {
SNMP_ADAPTOR_LOGGER.logp(
Level.FINEST,
SnmpInformRequest.class.getName(),
"handleInternalError",
"Snmp error/index = "
+ snmpErrorToString(errorStatus)
+ "/"
+ errorIndex
+ ". Invoking internal error user defined callback...\n"
+ getVarBindList());
}
deleteRequest();
notifyClient();
requestPdu = null;
responsePdu = null;
internalVarBind = null;
try {
if (callback != null) callback.processSnmpInternalError(this, reason);
} catch (Exception e) { // catch any exception a user might not handle.
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINEST)) {
SNMP_ADAPTOR_LOGGER.logp(
Level.FINEST,
SnmpInformRequest.class.getName(),
"handleInternalError",
"Exception generated by user callback",
e);
}
} catch (OutOfMemoryError ome) {
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINEST)) {
SNMP_ADAPTOR_LOGGER.logp(
Level.FINEST,
SnmpInformRequest.class.getName(),
"handleInternalError",
"OutOfMemory Error generated by user callback",
ome);
}
Thread.currentThread().yield();
}
}
/** Calls the user implementation of the <CODE>SnmpInformHandler</CODE> interface. */
private void handleSuccess() {
setRequestStatus(stResultsAvailable);
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINER)) {
SNMP_ADAPTOR_LOGGER.logp(
Level.FINER,
SnmpInformRequest.class.getName(),
"handleSuccess",
"Invoking user defined callback...");
}
deleteRequest(); // delete only non-poll request.
notifyClient();
requestPdu = null;
// responsePdu = null;
internalVarBind = null;
try { // catch all user exception which may happen in callback.
if (callback != null)
callback.processSnmpPollData(this, errorStatus, errorIndex, getVarBindList());
} catch (Exception e) {
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINEST)) {
SNMP_ADAPTOR_LOGGER.logp(
Level.FINEST,
SnmpInformRequest.class.getName(),
"handleSuccess",
"Exception generated by user callback",
e);
}
} catch (OutOfMemoryError ome) {
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINEST)) {
SNMP_ADAPTOR_LOGGER.logp(
Level.FINEST,
SnmpInformRequest.class.getName(),
"handleSuccess",
"OutOfMemory Error generated by user callback",
ome);
}
Thread.currentThread().yield();
}
return;
}
boolean sendPdu() {
try {
responsePdu = null;
SnmpPduFactory pduFactory = adaptor.getPduFactory();
SnmpMessage msg =
(SnmpMessage)
pduFactory.encodeSnmpPdu(
(SnmpPduPacket) requestPdu, adaptor.getBufferSize().intValue());
if (msg == null) {
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINEST)) {
SNMP_ADAPTOR_LOGGER.logp(
Level.FINEST,
SnmpInformRequest.class.getName(),
"sendPdu",
"pdu factory returned a null value");
}
throw new SnmpStatusException(snmpReqUnknownError);
// This exception will caught hereafter and reported as an snmpReqUnknownError
// FIXME: may be it's not the best behaviour ?
}
int maxPktSize = adaptor.getBufferSize().intValue();
byte[] encoding = new byte[maxPktSize];
int encodingLength = msg.encodeMessage(encoding);
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINER)) {
SNMP_ADAPTOR_LOGGER.logp(
Level.FINER,
SnmpInformRequest.class.getName(),
"sendPdu",
"Dump : \n" + msg.printMessage());
}
sendPduPacket(encoding, encodingLength);
return true;
} catch (SnmpTooBigException ar) {
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINEST)) {
SNMP_ADAPTOR_LOGGER.logp(
Level.FINEST,
SnmpInformRequest.class.getName(),
"sendPdu",
"Got unexpected exception",
ar);
}
setErrorStatusAndIndex(snmpReqPacketOverflow, ar.getVarBindCount());
requestPdu = null;
reason = ar.getMessage();
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINEST)) {
SNMP_ADAPTOR_LOGGER.logp(
Level.FINEST,
SnmpInformRequest.class.getName(),
"sendPdu",
"Packet Overflow while building inform request");
}
} catch (java.io.IOException ioe) {
setErrorStatusAndIndex(snmpReqSocketIOError, 0);
reason = ioe.getMessage();
} catch (Exception e) {
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINEST)) {
SNMP_ADAPTOR_LOGGER.logp(
Level.FINEST,
SnmpInformRequest.class.getName(),
"sendPdu",
"Got unexpected exception",
e);
}
setErrorStatusAndIndex(snmpReqUnknownError, 0);
reason = e.getMessage();
}
return false;
}
public void run() {
try {
final ThreadContext oldContext = ThreadContext.push("SnmpUserData", data);
try {
switch (type) {
case pduGetRequestPdu:
// Invoke a get operation
//
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINER)) {
SNMP_ADAPTOR_LOGGER.logp(
Level.FINER,
SnmpSubRequestHandler.class.getName(),
"run",
"[" + Thread.currentThread() + "]:get operation on " + agent.getMibName());
}
agent.get(createMibRequest(varBind, version, data));
break;
case pduGetNextRequestPdu:
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINER)) {
SNMP_ADAPTOR_LOGGER.logp(
Level.FINER,
SnmpSubRequestHandler.class.getName(),
"run",
"[" + Thread.currentThread() + "]:getNext operation on " + agent.getMibName());
}
// #ifdef DEBUG
agent.getNext(createMibRequest(varBind, version, data));
break;
case pduSetRequestPdu:
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINER)) {
SNMP_ADAPTOR_LOGGER.logp(
Level.FINER,
SnmpSubRequestHandler.class.getName(),
"run",
"[" + Thread.currentThread() + "]:set operation on " + agent.getMibName());
}
agent.set(createMibRequest(varBind, version, data));
break;
case pduWalkRequest:
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINER)) {
SNMP_ADAPTOR_LOGGER.logp(
Level.FINER,
SnmpSubRequestHandler.class.getName(),
"run",
"[" + Thread.currentThread() + "]:check operation on " + agent.getMibName());
}
agent.check(createMibRequest(varBind, version, data));
break;
default:
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINEST)) {
SNMP_ADAPTOR_LOGGER.logp(
Level.FINEST,
SnmpSubRequestHandler.class.getName(),
"run",
"["
+ Thread.currentThread()
+ "]:unknown operation ("
+ type
+ ") on "
+ agent.getMibName());
}
errorStatus = snmpRspGenErr;
errorIndex = 1;
break;
} // end of switch
} finally {
ThreadContext.restore(oldContext);
}
} catch (SnmpStatusException x) {
errorStatus = x.getStatus();
errorIndex = x.getErrorIndex();
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINEST)) {
SNMP_ADAPTOR_LOGGER.logp(
Level.FINEST,
SnmpSubRequestHandler.class.getName(),
"run",
"[" + Thread.currentThread() + "]:an Snmp error occured during the operation",
x);
}
} catch (Exception x) {
errorStatus = SnmpDefinitions.snmpRspGenErr;
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINEST)) {
SNMP_ADAPTOR_LOGGER.logp(
Level.FINEST,
SnmpSubRequestHandler.class.getName(),
"run",
"[" + Thread.currentThread() + "]:a generic error occured during the operation",
x);
}
}
if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINER)) {
SNMP_ADAPTOR_LOGGER.logp(
Level.FINER,
SnmpSubRequestHandler.class.getName(),
"run",
"[" + Thread.currentThread() + "]:operation completed");
}
}
