Transport tweaks¶
Serving multiple network interfaces¶
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 IPv4/UDP, listening at 127.0.0.1:2162
- using Asyncio framework for network transport
- 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
$ snmpinform -v2c -c public 127.0.0.1:2162 123 1.3.6.1.6.3.1.1.5.1
Requires Python 3.4 and later!
from pysnmp.entity import engine, config
from pysnmp.carrier.asyncio.dgram import udp
from pysnmp.entity.rfc3413 import ntfrcv
import asyncio
# Get the event loop for this thread
loop = asyncio.get_event_loop()
# 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))
)
# UDP over IPv4, second listening interface/port
config.addTransport(
snmpEngine,
udp.domainName + (2,),
udp.UdpTransport().openServerMode(('127.0.0.1', 2162))
)
# SNMPv1/2c setup
# SecurityName <-> CommunityName mapping
config.addV1System(snmpEngine, 'my-area', 'public')
# Callback function for receiving notifications
# noinspection PyUnusedLocal
def cbFun(snmpEngine, stateReference, contextEngineId,
contextName, varBinds, cbCtx):
transportDomain, transportAddress = snmpEngine.msgAndPduDsp.getTransportInfo(stateReference)
print('Notification from %s, SNMP Engine %s, '
'Context %s' % (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)
# Run asyncio main loop
loop.run_forever()
Download
script.
See also: library reference.