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|
"""
Receive notifications noting peer address
+++++++++++++++++++++++++++++++++++++++++
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
* use observer facility to pull lower-level request details from SNMP engine
* print received data on stdout
Either of the following Net-SNMP commands will send notifications to this
receiver:
| $ snmptrap -v2c -c public 127.0.0.1:162 123 1.3.6.1.6.3.1.1.5.1 1.3.6.1.2.1.1.5.0 s test
"""#
from pysnmp.entity import engine, config
from pysnmp.carrier.asyncore.dgram import udp
from pysnmp.entity.rfc3413 import ntfrcv
# Create SNMP engine with autogenernated engineID and pre-bound
# to socket transport dispatcher
snmpEngine = engine.SnmpEngine()
# Transport setup
# UDP over IPv4, first listening interface/port
config.addTransport(
snmpEngine,
udp.domainName + (1,),
udp.UdpTransport().openServerMode(('127.0.0.1', 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):
# Get an execution context...
execContext = snmpEngine.observer.getExecutionContext(
'rfc3412.receiveMessage:request'
)
# ... and use inner SNMP engine data to figure out peer address
print('Notification from %s, ContextEngineId "%s", ContextName "%s"' % (
'@'.join([str(x) for x in execContext['transportAddress']]),
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.transportDispatcher.closeDispatcher()
raise
|
