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from pysnmp.proto import rfc3411, error
from pysnmp.proto.api import v1, v2c # backend is always SMIv2 compliant
from pysnmp.proto.proxy import rfc2576
# 3.4
class NotificationReceiver:
pduTypes = (
v1.TrapPDU.tagSet,
v2c.SNMPv2TrapPDU.tagSet,
v2c.InformRequestPDU.tagSet
)
def __init__(self, snmpEngine, cbFun, cbCtx=None):
snmpEngine.msgAndPduDsp.registerContextEngineId(
'', self.pduTypes, self.processPdu # '' is a wildcard
)
self.__cbFun = cbFun
self.__cbCtx = cbCtx
def close(self, snmpEngine):
snmpEngine.msgAndPduDsp.unregisterContextEngineId(
self.snmpContext.contextEngineId, self.pduTypes
)
def processPdu(
self,
snmpEngine,
messageProcessingModel,
securityModel,
securityName,
securityLevel,
contextEngineID,
contextName,
pduVersion,
PDU,
maxSizeResponseScopedPDU,
stateReference
):
# Agent-side API complies with SMIv2
if messageProcessingModel == 0:
PDU = rfc2576.v1ToV2(PDU)
errorStatus = 'noError'; errorIndex = 0
varBinds = v2c.apiPDU.getVarBinds(PDU)
# 3.4
if rfc3411.confirmedClassPDUs.has_key(PDU.tagSet):
# 3.4.1 --> no-op
# 3.4.2
v2c.apiPDU.setErrorStatus(rspPDU, errorStatus)
v2c.apiPDU.setErrorIndex(rspPDU, errorIndex)
v2c.apiPDU.setVarBinds(rspPDU, varBinds)
# Agent-side API complies with SMIv2
if messageProcessingModel == 0:
rspPDU = rfc2576.v2ToV1(rspPDU)
# 3.4.3
try:
snmpEngine.msgAndPduDsp.returnResponsePdu(
snmpEngine,
messageProcessingModel,
securityModel,
securityName,
securityLevel,
contextEngineID,
contextName,
pduVersion,
rspPDU,
maxSizeResponseScopedPDU,
stateReference,
statusInformation
)
except error.StatusInformation:
snmpSilentDrops, = snmpEngine.msgAndPduDsp.mibInstrumController.mibBuilder.importSymbols('SNMPv2-MIB', 'snmpSilentDrops')
snmpSilentDrops.syntax = snmpSilentDrops.syntax + 1
elif rfc3411.unconfirmedClassPDUs.has_key(PDU.tagSet):
pass
else:
raise error.ProtocolError('Unexpected PDU class %s' % PDU.tagSet)
self.__cbFun(
self.snmpEngine, contextEngineID, contextName, varBinds, cbCtx
)
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