def _sendNotification(self,
snmpEngine,
notificationTarget,
notificationName,
additionalVarBinds=(),
cbFun=None,
cbCtx=None,
contextName=null,
instanceIndex=None):
if self.snmpContext is None:
raise error.ProtocolError('SNMP context not specified')
#
# Here we first expand trap OID into associated OBJECTS
# and then look them up at context-specific MIB
#
mibViewController = snmpEngine.getUserContext('mibViewController')
if not mibViewController:
mibViewController = view.MibViewController(snmpEngine.getMibBuilder())
snmpEngine.setUserContext(mibViewController=mibViewController)
# Support the following syntax:
# '1.2.3.4'
# (1,2,3,4)
# ('MIB', 'symbol')
if isinstance(notificationName, (tuple, list)) and \
notificationName and isinstance(notificationName[0], str):
notificationName = rfc1902.ObjectIdentity(*notificationName)
else:
notificationName = rfc1902.ObjectIdentity(notificationName)
varBinds = rfc1902.NotificationType(
notificationName, instanceIndex=instanceIndex
).resolveWithMib(mibViewController)
mibInstrumController = self.snmpContext.getMibInstrum(contextName)
varBinds = varBinds[:1] + mibInstrumController.readVars(varBinds[1:])
return self.sendVarBinds(snmpEngine,
notificationTarget,
self.snmpContext.contextEngineId,
contextName,
varBinds + list(additionalVarBinds),
_sendNotificationCbFun,
(cbFun, cbCtx))
# to what targets (chosen by tag) and what filter should apply to
# the set of targets (selected by tag)
config.addNotificationTarget(snmpEngine, 'my-notification', 'my-filter',
'all-my-managers', 'trap')
# Allow NOTIFY access to Agent's MIB by this SNMP model (2), securityLevel
# and SecurityName
config.addContext(snmpEngine, '')
config.addVacmUser(snmpEngine, 2, 'my-area', 'noAuthNoPriv', (), (), (1, 3, 6))
# *** SNMP engine configuration is complete by this line ***
# Create Notification Originator App instance.
ntfOrg = ntforg.NotificationOriginator()
# Build and submit notification message to dispatcher
ntfOrg.sendVarBinds(
snmpEngine,
'my-notification', # notification targets
None,
'', # contextEngineId, contextName
rfc1902.NotificationType(
rfc1902.ObjectIdentity('IF-MIB', 'linkUp'),
instanceIndex=instanceIndex,
objects=objects).resolveWithMib(mibViewController))
print('Notification is scheduled to be sent')
# Run I/O dispatcher which would send pending message and process response
snmpEngine.transportDispatcher.runDispatcher()
rfc1902.ObjectIdentity('SNMPv2-MIB', 'sysObjectID', 0),
'1.3.6.1').resolveWithMib(mibView)
print(varBind[0].prettyPrint(), varBind[1].__class__.__name__,
varBind[1].prettyPrint())
# Create just OID
varBind = rfc1902.ObjectType(
rfc1902.ObjectIdentity('SNMPv2-MIB', 'sysObjectID',
0)).resolveWithMib(mibView)
print(varBind[0].prettyPrint(), varBind[1].__class__.__name__,
varBind[1].prettyPrint())
# Create var-binds from MIB notification object (without OBJECTS clause)
varBinds = rfc1902.NotificationType(
rfc1902.ObjectIdentity('SNMPv2-MIB', 'coldStart')).resolveWithMib(mibView)
print([
'%s = %s(%s)' %
(x[0].prettyPrint(), x[1].__class__.__name__, x[1].prettyPrint())
for x in varBinds
])
# Create var-binds from MIB notification object (with OBJECTS clause)
varBinds = rfc1902.NotificationType(rfc1902.ObjectIdentity('IF-MIB', 'linkUp'),
instanceIndex=(1, ),
objects={
('IF-MIB', 'ifOperStatus'): 'down'
}).resolveWithMib(mibView)
print(varBinds.prettyPrint())
