Anybody got an idea? I don't understands why the code hangs on the wait
as the request is being ignored. Could it help to set .the
syncResponse.wait(); with an timeout value of 10 seconds or is there
more time needed for the agent to response?
Thanks.
Met vriendelijke groet / Kind Regards,
ing. Harry van Oosten
Software engineer
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Oosten, Harry van
Sent: dinsdag 5 augustus 2008 10:08
To: [email protected]
Subject: [SNMP4J] Code hangs on syncResponse.wait();
Hi,
I managed to create an test class that's send a GETBULK request to an
configured switch and router. This goes well as long as I use the right
username password.
Only when I change a username or password the request is ignored by the
device and the code hangs on the syncResponse.wait();
MyCode:
public class SNMPManager {
private boolean needConfig = false;
public static void main(String[] args) {
SNMPManager snmpMan = new SNMPManager();
System.out.println("Switch = up?
"+snmpMan.isResponding("192.168.16.122", "1AuthUser", "AuthPassword",
null)); //wrong username
System.out.println(snmpMan.needConfig);
}
public boolean isResponding(String ipAddress, String userName,
String authPassword, String privPassword){
List<String> OIDList = new LinkedList<String>();
//OIDList.add("");
PDU pdu;
try {
pdu = getPDU(ipAddress, userName, authPassword, privPassword
,OIDList);
if (pdu != null) {
System.out.println(pdu);
return true;
} else{
return false;
}
} catch (IOException e) {
e.printStackTrace();
needConfig = true;
return false;
}
}
private PDU getPDU(String ipAddress, String userName, String
authPassword, String privPassword ,List<String> OIDList) throws
IOException {
//Create transport.
Address targetAddress =
GenericAddress.parse("udp:"+ipAddress+"/161");
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();
// add user to the USM
if (privPassword != null) {
snmp.getUSM().addUser(new OctetString(userName),
//new
OctetString("80:00:13:70:c0:a8:01:0d"),
new UsmUser(new OctetString(userName),
AuthMD5.ID,
new
OctetString(authPassword),
PrivDES.ID,
new
OctetString(privPassword)
)); //Fill out!
} else {
snmp.getUSM().addUser(new OctetString(userName),
//new
OctetString("80:00:13:70:c0:a8:01:0d"),
new UsmUser(new OctetString(userName),
AuthMD5.ID,
new
OctetString(authPassword),
null,
null));
}
//Create target.
UserTarget target = createTarget(targetAddress, userName);
//Create the PDU
PDU pdu = createPDU(OIDList);
//Send the PDU
ResponseEvent responseEvent = snmp.send(pdu, target);
//Exctract the response PDU (could be null if timed out)
PDU responsePDU = responseEvent.getResponse();
closeTransport(transport);
return responsePDU;
}
/**
* Used to create the PDU.
* Gets a list of Strings containing the OID's that needs to be
acquired.
* @param OIDList String List
* @return PDU
*/
private PDU createPDU(List<String> OIDList) {
PDU pdu = new ScopedPDU();
for (String oid :OIDList ) {
pdu.add(new VariableBinding(new OID(oid)));
}
pdu.setType(PDU.GETBULK);
return pdu;
}
private UserTarget createTarget(Address targetAddress, String
userName) {
UserTarget target = new UserTarget();
target.setAddress(targetAddress);
target.setRetries(0);
target.setTimeout(5000);
target.setVersion(SnmpConstants.version3);
target.setSecurityLevel(SecurityLevel.AUTH_NOPRIV);
target.setSecurityName(new OctetString(userName));
return target;
}
private void closeTransport(TransportMapping transport) throws
IOException {
transport.close();
}
}
Where it goes wrong: (snmp.java)
public ResponseEvent send(PDU pdu, Target target,
TransportMapping transport) throws
IOException {
if (!pdu.isConfirmedPdu()) {
sendMessage(pdu, target, transport, null);
return null;
}
if (timer == null) {
createPendingTimer();
}
SyncResponseListener syncResponse = new SyncResponseListener();
PendingRequest retryRequest = null;
synchronized (syncResponse) {
PduHandle handle = null;
PendingRequest request =
new PendingRequest(syncResponse, target, pdu, target,
transport);
handle = sendMessage(pdu, target, transport, request);
try {
syncResponse.wait();
retryRequest = (PendingRequest) pendingRequests.remove(handle);
if (logger.isDebugEnabled()) {
logger.debug("Removed pending request with handle: "+handle);
}
request.setFinished();
request.cancel();
}
catch (InterruptedException iex) {
logger.warn(iex);
// ignore
}
}
if (retryRequest != null) {
retryRequest.setFinished();
retryRequest.cancel();
}
return syncResponse.response;
}
private synchronized void createPendingTimer() {
if (timer == null) {
timer = SNMP4JSettings.getTimerFactory().createTimer();
}
}
Hope you can help!
Met vriendelijke groet / Kind Regards,
ing. Harry van Oosten
Software engineer
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copies and inform the sender. Thank you.
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