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"""
Observe SNMP engine internal operations
+++++++++++++++++++++++++++++++++++++++
Receive SNMP TRAP/INFORM messages with the following options:
* SNMPv1/SNMPv2c
* with SNMP community "public"
* over IPv4/UDP, listening at 127.0.0.1:162
over IPv6/UDP, listening at [::1]:162
* registers its own execution observer to snmpEngine
* print received data on stdout
Either of the following Net-SNMP commands will send notifications to this
receiver:
| $ snmptrap -v1 -c public 127.0.0.1 1.3.6.1.4.1.20408.4.1.1.2 127.0.0.1 1 1 123 1.3.6.1.2.1.1.1.0 s test
| $ snmptrap -v2c -c public udp6:[::1]:162 123 1.3.6.1.6.3.1.1.5.1 1.3.6.1.2.1.1.5.0 s test
| $ snmpinform -v2c -c public 127.0.0.1 123 1.3.6.1.6.3.1.1.5.1
"""#
from pysnmp.entity import engine, config
from pysnmp.carrier.asyncore.dgram import udp, udp6
from pysnmp.entity.rfc3413 import ntfrcv
# Create SNMP engine with autogenernated engineID and pre-bound
# to socket transport dispatcher
snmpEngine = engine.SnmpEngine()
# Execution point observer setup
# Register a callback to be invoked at specified execution point of
# SNMP Engine and passed local variables at code point's local scope
def requestObserver(snmpEngine, execpoint, variables, cbCtx):
print('Execution point: %s' % execpoint)
print('* transportDomain: %s' % '.'.join([str(x) for x in variables['transportDomain']]))
print('* transportAddress: %s' % '@'.join([str(x) for x in variables['transportAddress']]))
print('* securityModel: %s' % variables['securityModel'])
print('* securityName: %s' % variables['securityName'])
print('* securityLevel: %s' % variables['securityLevel'])
print('* contextEngineId: %s' % variables['contextEngineId'].prettyPrint())
print('* contextName: %s' % variables['contextName'].prettyPrint())
print('* PDU: %s' % variables['pdu'].prettyPrint())
snmpEngine.observer.registerObserver(
requestObserver,
'rfc3412.receiveMessage:request',
'rfc3412.returnResponsePdu'
)
# Transport setup
# UDP over IPv4
config.addTransport(
snmpEngine,
udp.domainName,
udp.UdpTransport().openServerMode(('127.0.0.1', 162))
)
# UDP over IPv6
config.addTransport(
snmpEngine,
udp6.domainName,
udp6.Udp6Transport().openServerMode(('::1', 162))
)
# SNMPv1/2c setup
# SecurityName <-> CommunityName mapping
config.addV1System(snmpEngine, 'my-area', 'public')
# Callback function for receiving notifications
def cbFun(snmpEngine, stateReference, contextEngineId, contextName,
varBinds, cbCtx):
print('Notification from ContextEngineId "%s", ContextName "%s"' % (
contextEngineId.prettyPrint(),
contextName.prettyPrint()
)
)
for name, val in varBinds:
print('%s = %s' % (name.prettyPrint(), val.prettyPrint()))
# Register SNMP Application at the SNMP engine
ntfrcv.NotificationReceiver(snmpEngine, cbFun)
snmpEngine.transportDispatcher.jobStarted(1) # this job would never finish
# Run I/O dispatcher which would receive queries and send confirmations
try:
snmpEngine.transportDispatcher.runDispatcher()
except:
snmpEngine.observer.unregisterObserver()
snmpEngine.transportDispatcher.closeDispatcher()
raise
|
