void discoverIfNeeded() throws java.io.IOException, PduException {
uk.co.westhawk.snmp.beans.UsmDiscoveryBean discBean = null;
boolean isNeeded = false;
TimeWindow tWindow = TimeWindow.getCurrent();
String engineId = tWindow.getSnmpEngineId(hostAddr, hostPort);
if (engineId == null) {
isNeeded = true;
discBean = new uk.co.westhawk.snmp.beans.UsmDiscoveryBean(hostAddr, hostPort, typeSocket);
}
if (isUseAuthentication()) {
if (isNeeded) {
discBean.setAuthenticationDetails(
userName, userAuthenticationPassword, authenticationProtocol);
} else if (tWindow.isTimeLineKnown(engineId) == false) {
isNeeded = true;
discBean = new uk.co.westhawk.snmp.beans.UsmDiscoveryBean(hostAddr, hostPort, typeSocket);
discBean.setAuthenticationDetails(
userName, userAuthenticationPassword, authenticationProtocol);
}
if (isNeeded && isUsePrivacy()) {
discBean.setPrivacyDetails(userPrivacyPassword);
}
}
if (isNeeded) {
discBean.startDiscovery();
}
}
/**
* Encodes a pdu packet. If the stack is authoritative, the timeline details are retrieved from
* the usmAgent. If not, this methods first checks if all the discovery paramters are all known,
* if not it will throw an EncodingException. If so, it encodes and returns the bytes.
*/
public byte[] encodePacket(byte msg_type, int rId, int errstat, int errind, Enumeration ve)
throws java.io.IOException, EncodingException {
TimeWindowNode node;
if (isDestroyed == true) {
throw new EncodingException("Context can no longer be used, since it is already destroyed");
} else {
if (isAuthoritative(msg_type) == true) {
usmAgent.setSnmpContext(this);
node =
new TimeWindowNode(
usmAgent.getSnmpEngineId(),
usmAgent.getSnmpEngineBoots(),
usmAgent.getSnmpEngineTime());
} else {
TimeWindow tWindow = TimeWindow.getCurrent();
if (tWindow.isSnmpEngineIdKnown(hostAddr, hostPort) == false) {
throw new EncodingException(
"Engine ID of host "
+ hostAddr
+ ", port "
+ hostPort
+ " is unknown. Perform discovery.");
}
String engineId = tWindow.getSnmpEngineId(hostAddr, hostPort);
node = new TimeWindowNode(engineId, 0, 0);
if (isUseAuthentication()) {
if (tWindow.isTimeLineKnown(engineId) == true) {
node = tWindow.getTimeLine(engineId);
} else {
throw new EncodingException(
"Time Line of Engine ID of host "
+ hostAddr
+ ", port "
+ hostPort
+ " is unknown. "
+ "Perform discovery.");
}
}
}
}
return actualEncodePacket(msg_type, rId, errstat, errind, ve, node);
}