84 lines
2.9 KiB
Python
84 lines
2.9 KiB
Python
"""
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Listen for notifications at IPv4 & IPv6 interfaces
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++++++++++++++++++++++++++++++++++++++++++++++++++
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Receive SNMP TRAP messages with the following options:
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* SNMPv1/SNMPv2c
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* with SNMP community "public"
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* over IPv4/UDP, listening at 127.0.0.1:162
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* over IPv6/UDP, listening at [::1]:162
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* print received data on stdout
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Either of the following Net-SNMP commands will send notifications to this
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receiver:
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| $ 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
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| $ snmptrap -v2c -c public udp6:[::1] 123 1.3.6.1.6.3.1.1.5.1 1.3.6.1.2.1.1.5.0 s test
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Notification Receiver below uses two different transports for communication
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with Notification Originators - UDP over IPv4 and UDP over IPv6.
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"""#
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from pysnmp.carrier.asyncore.dispatch import AsyncoreDispatcher
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from pysnmp.carrier.asyncore.dgram import udp, udp6
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from pyasn1.codec.ber import decoder
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from pysnmp.proto import api
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# noinspection PyUnusedLocal
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def cbFun(transportDispatcher, transportDomain, transportAddress, wholeMsg):
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while wholeMsg:
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msgVer = int(api.decodeMessageVersion(wholeMsg))
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if msgVer in api.protoModules:
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pMod = api.protoModules[msgVer]
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else:
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print('Unsupported SNMP version %s' % msgVer)
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return
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reqMsg, wholeMsg = decoder.decode(
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wholeMsg, asn1Spec=pMod.Message(),
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)
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print('Notification message from %s:%s: ' % (
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transportDomain, transportAddress
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)
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)
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reqPDU = pMod.apiMessage.getPDU(reqMsg)
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if reqPDU.isSameTypeWith(pMod.TrapPDU()):
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if msgVer == api.protoVersion1:
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print('Enterprise: %s' % (pMod.apiTrapPDU.getEnterprise(reqPDU).prettyPrint()))
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print('Agent Address: %s' % (pMod.apiTrapPDU.getAgentAddr(reqPDU).prettyPrint()))
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print('Generic Trap: %s' % (pMod.apiTrapPDU.getGenericTrap(reqPDU).prettyPrint()))
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print('Specific Trap: %s' % (pMod.apiTrapPDU.getSpecificTrap(reqPDU).prettyPrint()))
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print('Uptime: %s' % (pMod.apiTrapPDU.getTimeStamp(reqPDU).prettyPrint()))
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varBinds = pMod.apiTrapPDU.getVarBinds(reqPDU)
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else:
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varBinds = pMod.apiPDU.getVarBinds(reqPDU)
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print('Var-binds:')
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for oid, val in varBinds:
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print('%s = %s' % (oid.prettyPrint(), val.prettyPrint()))
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return wholeMsg
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transportDispatcher = AsyncoreDispatcher()
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transportDispatcher.registerRecvCbFun(cbFun)
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# UDP/IPv4
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transportDispatcher.registerTransport(
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udp.domainName, udp.UdpSocketTransport().openServerMode(('localhost', 162))
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)
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# UDP/IPv6
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transportDispatcher.registerTransport(
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udp6.domainName, udp6.Udp6SocketTransport().openServerMode(('::1', 162))
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)
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transportDispatcher.jobStarted(1)
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try:
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# Dispatcher will never finish as job#1 never reaches zero
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transportDispatcher.runDispatcher()
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except:
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transportDispatcher.closeDispatcher()
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raise
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