109 lines
4.1 KiB
Python
109 lines
4.1 KiB
Python
#
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# This file is part of pysnmp software.
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#
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# Copyright (c) 2005-2017, Ilya Etingof <etingof@gmail.com>
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# License: http://pysnmp.sf.net/license.html
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#
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import sys
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from pyasn1.compat.octets import null
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from pysnmp.proto import rfc3411, error
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from pysnmp.proto.api import v1, v2c # backend is always SMIv2 compliant
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from pysnmp.proto.proxy import rfc2576
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from pysnmp import debug
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# 3.4
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class NotificationReceiver(object):
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pduTypes = (v1.TrapPDU.tagSet, v2c.SNMPv2TrapPDU.tagSet,
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v2c.InformRequestPDU.tagSet)
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def __init__(self, snmpEngine, cbFun, cbCtx=None):
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snmpEngine.msgAndPduDsp.registerContextEngineId(
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null, self.pduTypes, self.processPdu # '' is a wildcard
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)
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self.__cbFunVer = 0
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self.__cbFun = cbFun
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self.__cbCtx = cbCtx
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def close(self, snmpEngine):
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snmpEngine.msgAndPduDsp.unregisterContextEngineId(
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null, self.pduTypes
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)
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self.__cbFun = self.__cbCtx = None
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def processPdu(self, snmpEngine, messageProcessingModel,
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securityModel, securityName, securityLevel,
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contextEngineId, contextName, pduVersion, PDU,
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maxSizeResponseScopedPDU, stateReference):
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# Agent-side API complies with SMIv2
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if messageProcessingModel == 0:
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origPdu = PDU
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PDU = rfc2576.v1ToV2(PDU)
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else:
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origPdu = None
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errorStatus = 'noError'
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errorIndex = 0
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varBinds = v2c.apiPDU.getVarBinds(PDU)
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debug.logger & debug.flagApp and debug.logger(
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'processPdu: stateReference %s, varBinds %s' % (stateReference, varBinds))
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# 3.4
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if PDU.tagSet in rfc3411.confirmedClassPDUs:
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# 3.4.1 --> no-op
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rspPDU = v2c.apiPDU.getResponse(PDU)
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# 3.4.2
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v2c.apiPDU.setErrorStatus(rspPDU, errorStatus)
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v2c.apiPDU.setErrorIndex(rspPDU, errorIndex)
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v2c.apiPDU.setVarBinds(rspPDU, varBinds)
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debug.logger & debug.flagApp and debug.logger(
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'processPdu: stateReference %s, confirm PDU %s' % (stateReference, rspPDU.prettyPrint()))
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# Agent-side API complies with SMIv2
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if messageProcessingModel == 0:
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rspPDU = rfc2576.v2ToV1(rspPDU, origPdu)
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statusInformation = {}
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# 3.4.3
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try:
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snmpEngine.msgAndPduDsp.returnResponsePdu(
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snmpEngine, messageProcessingModel, securityModel,
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securityName, securityLevel, contextEngineId,
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contextName, pduVersion, rspPDU, maxSizeResponseScopedPDU,
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stateReference, statusInformation)
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except error.StatusInformation:
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debug.logger & debug.flagApp and debug.logger(
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'processPdu: stateReference %s, statusInformation %s' % (stateReference, sys.exc_info()[1]))
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snmpSilentDrops, = snmpEngine.msgAndPduDsp.mibInstrumController.mibBuilder.importSymbols('__SNMPv2-MIB',
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'snmpSilentDrops')
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snmpSilentDrops.syntax += 1
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elif PDU.tagSet in rfc3411.unconfirmedClassPDUs:
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pass
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else:
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raise error.ProtocolError('Unexpected PDU class %s' % PDU.tagSet)
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debug.logger & debug.flagApp and debug.logger(
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'processPdu: stateReference %s, user cbFun %s, cbCtx %s, varBinds %s' % (
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stateReference, self.__cbFun, self.__cbCtx, varBinds))
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if self.__cbFunVer:
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self.__cbFun(snmpEngine, stateReference, contextEngineId,
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contextName, varBinds, self.__cbCtx)
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else:
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# Compatibility stub (handle legacy cbFun interface)
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try:
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self.__cbFun(snmpEngine, contextEngineId, contextName,
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varBinds, self.__cbCtx)
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except TypeError:
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self.__cbFunVer = 1
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self.__cbFun(snmpEngine, stateReference, contextEngineId,
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contextName, varBinds, self.__cbCtx)
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