def _recvCb(self, snmpEngine, transportDomain, transportAddress, wholeMsg):
try:
mpModel = verdec.decodeMessageVersion(wholeMsg)
except error.ProtocolError:
return null # n.b the whole buffer gets dropped
debug.logger & debug.FLAG_DSP and debug.logger('receiveMessage: msgVersion %s, msg decoded' % mpModel)
pMod = api.PROTOCOL_MODULES[mpModel]
while wholeMsg:
rspMsg, wholeMsg = decoder.decode(wholeMsg, asn1Spec=pMod.Message())
rspPdu = pMod.apiMessage.getPDU(rspMsg)
requestId = pMod.apiPDU.getRequestID(rspPdu)
try:
stateInfo = self._pendingReqs.pop(requestId)
except KeyError:
continue
self.transportDispatcher.jobFinished(id(self))
cbFun = stateInfo['cbFun']
cbCtx = stateInfo['cbCtx']
if cbFun:
cbFun(self, requestId, None, rspPdu, cbCtx)
return wholeMsg
def receiveMessage(self, snmpEngine, transportDomain, transportAddress,
wholeMsg):
"""Message dispatcher -- de-serialize message into PDU"""
# 4.2.1.1
snmpInPkts, = self.mibInstrumController.mibBuilder.importSymbols(
'__SNMPv2-MIB', 'snmpInPkts')
snmpInPkts.syntax = snmpInPkts.syntax + 1
# 4.2.1.2
try:
restOfWholeMsg = '' # XXX fix decoder non-recursive return
msgVersion = verdec.decodeMessageVersion(wholeMsg)
except PySnmpError:
snmpInAsn1ParseErrs, = self.mibInstrumController.mibBuilder.importSymbols(
'__SNMPv2-MIB', 'snmpInAsn1ParseErrs')
snmpInAsn1ParseErrs.syntax = snmpInAsn1ParseErrs.syntax + 1
return '' # n.b the whole buffer gets dropped
debug.logger & debug.flagDsp and debug.logger(
'receiveMessage: msgVersion %s, msg decoded' % msgVersion)
messageProcessingModel = msgVersion
mpHandler = snmpEngine.messageProcessingSubsystems.get(
int(messageProcessingModel))
if mpHandler is None:
snmpInBadVersions, = self.mibInstrumController.mibBuilder.importSymbols(
'__SNMPv2-MIB', 'snmpInBadVersions')
snmpInBadVersions.syntax = snmpInBadVersions.syntax + 1
return restOfWholeMsg
# 4.2.1.3 -- no-op
# 4.2.1.4
try:
(messageProcessingModel, securityModel, securityName,
securityLevel, contextEngineId, contextName, pduVersion, PDU,
pduType, sendPduHandle, maxSizeResponseScopedPDU,
statusInformation,
stateReference) = mpHandler.prepareDataElements(
snmpEngine, transportDomain, transportAddress, wholeMsg)
debug.logger & debug.flagDsp and debug.logger(
'receiveMessage: MP succeded')
except error.StatusInformation, statusInformation:
if statusInformation.has_key('sendPduHandle'):
# Dropped REPORT -- re-run pending reqs queue as some
# of them may be waiting for this REPORT
debug.logger & debug.flagDsp and debug.logger(
'receiveMessage: MP failed, statusInformation %s' %
statusInformation)
self.__expireRequest(
snmpEngine,
self.__cachePop(statusInformation['sendPduHandle']),
statusInformation)
return restOfWholeMsg
def log(self, msg, address, direction):
#TODO: log snmp request/response at the same time.
if direction == 'in':
direction = 'request from'
log_key = 'request'
else:
direction = 'reply to'
log_key = 'response'
#0 = v1, 1 = v2, 3 = v3
version = verdec.decodeMessageVersion(msg)
if version == 0 or version == 1:
pMod = api.protoModules[version]
rspMsg, wholeMsg = decoder.decode(msg, asn1Spec=pMod.Message())
community_name = rspMsg.getComponentByPosition(1)
request_pdu = pMod.apiMessage.getPDU(rspMsg)
request_type = request_pdu.__class__.__name__
session_id = request_pdu.getComponentByPosition(0)
#will there ever be more than one item?
for oid, val in pMod.apiPDU.getVarBinds(request_pdu):
logger.debug('SNMPv{0} {1} {2}, Type: {3}, Community: {4}, '
'Oid: {5}, Value: {6}'.format(version + 1, direction, address, request_type,
community_name, oid, val))
elif version == 3:
logger.debug('SNMPv3 {0}: {1}. (Decoding not supported yet.)'.format(log_key, msg.encode('hex')))
else:
logger.debug('Unknown SNMP {0}: {1}'.format(log_key, msg.encode('hex')))
#raw data (all snmp version)
self.log_queue.put(
{'remote': address,
'timestamp': datetime.utcnow(),
'data_type': 'snmp',
'data': {
0: {log_key: msg.encode('hex')}
}}
)
def log(self, msg, address, direction):
# TODO: log snmp request/response at the same time.
if direction == "in":
direction = "request from"
log_key = "request"
else:
direction = "reply to"
log_key = "response"
# 0 = v1, 1 = v2, 3 = v3
version = verdec.decodeMessageVersion(msg)
if version == 0 or version == 1:
pMod = api.protoModules[version]
rspMsg, wholeMsg = decoder.decode(msg, asn1Spec=pMod.Message())
community_name = rspMsg.getComponentByPosition(1)
request_pdu = pMod.apiMessage.getPDU(rspMsg)
request_type = request_pdu.__class__.__name__
session_id = request_pdu.getComponentByPosition(0)
# will there ever be more than one item?
for oid, val in pMod.apiPDU.getVarBinds(request_pdu):
logger.debug(
"SNMPv{0} {1} {2}, Type: {3}, Community: {4}, "
"Oid: {5}, Value: {6}".format(
version + 1, direction, address, request_type, community_name, oid, val
)
)
# raw data (all snmp version)
self.log_queue.put(
{
"remote": address,
"timestamp": datetime.utcnow(),
"data_type": "snmp",
"data": {0: {log_key: msg.encode("hex")}},
}
)
def receiveMessage(
self,
snmpEngine,
transportDomain,
transportAddress,
wholeMsg
):
"""Message dispatcher -- de-serialize message into PDU"""
# 4.2.1.1
snmpInPkts, = self.mibInstrumController.mibBuilder.importSymbols(
'__SNMPv2-MIB', 'snmpInPkts'
)
snmpInPkts.syntax = snmpInPkts.syntax + 1
# 4.2.1.2
try:
restOfWholeMsg = null # XXX fix decoder non-recursive return
msgVersion = verdec.decodeMessageVersion(wholeMsg)
except PySnmpError:
snmpInAsn1ParseErrs, = self.mibInstrumController.mibBuilder.importSymbols('__SNMPv2-MIB', 'snmpInAsn1ParseErrs')
snmpInAsn1ParseErrs.syntax = snmpInAsn1ParseErrs.syntax + 1
return null # n.b the whole buffer gets dropped
debug.logger & debug.flagDsp and debug.logger('receiveMessage: msgVersion %s, msg decoded' % msgVersion)
messageProcessingModel = msgVersion
k = int(messageProcessingModel)
if k in snmpEngine.messageProcessingSubsystems:
mpHandler = snmpEngine.messageProcessingSubsystems[k]
else:
snmpInBadVersions, = self.mibInstrumController.mibBuilder.importSymbols('__SNMPv2-MIB', 'snmpInBadVersions')
snmpInBadVersions.syntax = snmpInBadVersions.syntax + 1
return restOfWholeMsg
# 4.2.1.3 -- no-op
# 4.2.1.4
try:
( messageProcessingModel,
securityModel,
securityName,
securityLevel,
contextEngineId,
contextName,
pduVersion,
PDU,
pduType,
sendPduHandle,
maxSizeResponseScopedPDU,
statusInformation,
stateReference ) = mpHandler.prepareDataElements(
snmpEngine,
transportDomain,
transportAddress,
wholeMsg
)
debug.logger & debug.flagDsp and debug.logger('receiveMessage: MP succeded')
except error.StatusInformation:
statusInformation = sys.exc_info()[1]
if 'sendPduHandle' in statusInformation:
# Dropped REPORT -- re-run pending reqs queue as some
# of them may be waiting for this REPORT
debug.logger & debug.flagDsp and debug.logger('receiveMessage: MP failed, statusInformation %s' % statusInformation)
self.__expireRequest(
statusInformation['sendPduHandle'],
self.__cache.pop(statusInformation['sendPduHandle']),
snmpEngine,
statusInformation
)
return restOfWholeMsg
debug.logger & debug.flagDsp and debug.logger('receiveMessage: PDU %s' % PDU.prettyPrint())
# 4.2.2
if sendPduHandle is None:
# 4.2.2.1 (request or notification)
debug.logger & debug.flagDsp and debug.logger('receiveMessage: pduType %s' % pduType)
# 4.2.2.1.1
processPdu = self.getRegisteredApp(contextEngineId, pduType)
# 4.2.2.1.2
if processPdu is None:
# 4.2.2.1.2.a
snmpUnknownPDUHandlers, = self.mibInstrumController.mibBuilder.importSymbols('__SNMP-MPD-MIB', 'snmpUnknownPDUHandlers')
snmpUnknownPDUHandlers.syntax = snmpUnknownPDUHandlers.syntax+1
# 4.2.2.1.2.b
statusInformation = {
'errorIndication': errind.unknownPDUHandler,
'oid': snmpUnknownPDUHandlers.name,
'val': snmpUnknownPDUHandlers.syntax
}
debug.logger & debug.flagDsp and debug.logger('receiveMessage: unhandled PDU type')
# XXX fails on unknown PDU
try:
( destTransportDomain,
destTransportAddress,
outgoingMessage ) = mpHandler.prepareResponseMessage(
snmpEngine,
messageProcessingModel,
securityModel,
securityName,
securityLevel,
contextEngineId,
contextName,
pduVersion,
PDU,
maxSizeResponseScopedPDU,
stateReference,
statusInformation
)
except error.StatusInformation:
debug.logger & debug.flagDsp and debug.logger('receiveMessage: report failed, statusInformation %s' % sys.exc_info()[1])
return restOfWholeMsg
# 4.2.2.1.2.c
try:
snmpEngine.transportDispatcher.sendMessage(
outgoingMessage,
destTransportDomain,
destTransportAddress
)
except PySnmpError: # XXX
pass
debug.logger & debug.flagDsp and debug.logger('receiveMessage: reporting succeeded')
# 4.2.2.1.2.d
return restOfWholeMsg
else:
# Pass transport info to app
if stateReference is not None:
self.__transportInfo[stateReference] = (
transportDomain, transportAddress
)
# 4.2.2.1.3
processPdu(
snmpEngine,
messageProcessingModel,
securityModel,
securityName,
securityLevel,
contextEngineId,
contextName,
pduVersion,
PDU,
maxSizeResponseScopedPDU,
stateReference
)
if stateReference is not None:
del self.__transportInfo[stateReference]
debug.logger & debug.flagDsp and debug.logger('receiveMessage: processPdu succeeded')
return restOfWholeMsg
else:
# 4.2.2.2 (response)
# 4.2.2.2.1
cachedParams = self.__cache.pop(sendPduHandle)
# 4.2.2.2.2
if cachedParams is None:
snmpUnknownPDUHandlers, = self.mibInstrumController.mibBuilder.importSymbols('__SNMP-MPD-MIB', 'snmpUnknownPDUHandlers')
snmpUnknownPDUHandlers.syntax = snmpUnknownPDUHandlers.syntax+1
return restOfWholeMsg
debug.logger & debug.flagDsp and debug.logger('receiveMessage: cache read by sendPduHandle %s' % sendPduHandle)
# 4.2.2.2.3
# no-op ? XXX
# 4.2.2.2.4
processResponsePdu = cachedParams['cbFun']
processResponsePdu(
snmpEngine,
messageProcessingModel,
securityModel,
securityName,
securityLevel,
contextEngineId,
contextName,
pduVersion,
PDU,
statusInformation,
cachedParams['sendPduHandle'],
cachedParams['cbCtx']
)
debug.logger & debug.flagDsp and debug.logger('receiveMessage: processResponsePdu succeeded')
return restOfWholeMsg
def receiveMessage(self, snmpEngine, transportDomain,
transportAddress, wholeMsg):
"""Message dispatcher -- de-serialize message into PDU"""
# 4.2.1.1
snmpInPkts, = self.mibInstrumController.mibBuilder.importSymbols(
'__SNMPv2-MIB', 'snmpInPkts'
)
snmpInPkts.syntax += 1
# 4.2.1.2
try:
restOfWholeMsg = null # XXX fix decoder non-recursive return
msgVersion = verdec.decodeMessageVersion(wholeMsg)
except error.ProtocolError:
snmpInASNParseErrs, = self.mibInstrumController.mibBuilder.importSymbols('__SNMPv2-MIB',
'snmpInASNParseErrs')
snmpInASNParseErrs.syntax += 1
return null # n.b the whole buffer gets dropped
debug.logger & debug.flagDsp and debug.logger('receiveMessage: msgVersion %s, msg decoded' % msgVersion)
messageProcessingModel = msgVersion
k = int(messageProcessingModel)
if k in snmpEngine.messageProcessingSubsystems:
mpHandler = snmpEngine.messageProcessingSubsystems[k]
else:
snmpInBadVersions, = self.mibInstrumController.mibBuilder.importSymbols('__SNMPv2-MIB', 'snmpInBadVersions')
snmpInBadVersions.syntax += 1
return restOfWholeMsg
# 4.2.1.3 -- no-op
# 4.2.1.4
try:
(messageProcessingModel, securityModel, securityName,
securityLevel, contextEngineId, contextName,
pduVersion, PDU, pduType, sendPduHandle,
maxSizeResponseScopedPDU, statusInformation,
stateReference) = mpHandler.prepareDataElements(
snmpEngine, transportDomain, transportAddress, wholeMsg
)
debug.logger & debug.flagDsp and debug.logger('receiveMessage: MP succeded')
except error.StatusInformation:
statusInformation = sys.exc_info()[1]
if 'sendPduHandle' in statusInformation:
# Dropped REPORT -- re-run pending reqs queue as some
# of them may be waiting for this REPORT
debug.logger & debug.flagDsp and debug.logger(
'receiveMessage: MP failed, statusInformation %s, forcing a retry' % statusInformation)
self.__expireRequest(
statusInformation['sendPduHandle'],
self.__cache.pop(statusInformation['sendPduHandle']),
snmpEngine,
statusInformation
)
return restOfWholeMsg
debug.logger & debug.flagDsp and debug.logger('receiveMessage: PDU %s' % PDU.prettyPrint())
# 4.2.2
if sendPduHandle is None:
# 4.2.2.1 (request or notification)
debug.logger & debug.flagDsp and debug.logger('receiveMessage: pduType %s' % pduType)
# 4.2.2.1.1
processPdu = self.getRegisteredApp(contextEngineId, pduType)
# 4.2.2.1.2
if processPdu is None:
# 4.2.2.1.2.a
snmpUnknownPDUHandlers, = self.mibInstrumController.mibBuilder.importSymbols('__SNMP-MPD-MIB',
'snmpUnknownPDUHandlers')
snmpUnknownPDUHandlers.syntax += 1
# 4.2.2.1.2.b
statusInformation = {
'errorIndication': errind.unknownPDUHandler,
'oid': snmpUnknownPDUHandlers.name,
'val': snmpUnknownPDUHandlers.syntax
}
debug.logger & debug.flagDsp and debug.logger('receiveMessage: unhandled PDU type')
# 4.2.2.1.2.c
try:
(destTransportDomain,
destTransportAddress,
outgoingMessage) = mpHandler.prepareResponseMessage(
snmpEngine, messageProcessingModel,
securityModel, securityName, securityLevel,
contextEngineId, contextName, pduVersion,
PDU, maxSizeResponseScopedPDU, stateReference,
statusInformation
)
snmpEngine.transportDispatcher.sendMessage(
outgoingMessage, destTransportDomain,
destTransportAddress
)
except PySnmpError:
debug.logger & debug.flagDsp and debug.logger(
'receiveMessage: report failed, statusInformation %s' % sys.exc_info()[1])
else:
debug.logger & debug.flagDsp and debug.logger('receiveMessage: reporting succeeded')
# 4.2.2.1.2.d
return restOfWholeMsg
else:
snmpEngine.observer.storeExecutionContext(
snmpEngine, 'rfc3412.receiveMessage:request',
dict(transportDomain=transportDomain,
transportAddress=transportAddress,
wholeMsg=wholeMsg,
messageProcessingModel=messageProcessingModel,
securityModel=securityModel,
securityName=securityName,
securityLevel=securityLevel,
contextEngineId=contextEngineId,
contextName=contextName,
pdu=PDU)
)
# pass transport info to app (legacy)
if stateReference is not None:
self.__transportInfo[stateReference] = (
transportDomain, transportAddress
)
# 4.2.2.1.3
processPdu(snmpEngine, messageProcessingModel,
securityModel, securityName, securityLevel,
contextEngineId, contextName, pduVersion,
PDU, maxSizeResponseScopedPDU, stateReference)
snmpEngine.observer.clearExecutionContext(
snmpEngine, 'rfc3412.receiveMessage:request'
)
# legacy
if stateReference is not None:
del self.__transportInfo[stateReference]
debug.logger & debug.flagDsp and debug.logger('receiveMessage: processPdu succeeded')
return restOfWholeMsg
else:
# 4.2.2.2 (response)
# 4.2.2.2.1
cachedParams = self.__cache.pop(sendPduHandle)
# 4.2.2.2.2
if cachedParams is None:
snmpUnknownPDUHandlers, = self.mibInstrumController.mibBuilder.importSymbols('__SNMP-MPD-MIB',
'snmpUnknownPDUHandlers')
snmpUnknownPDUHandlers.syntax += 1
return restOfWholeMsg
debug.logger & debug.flagDsp and debug.logger(
'receiveMessage: cache read by sendPduHandle %s' % sendPduHandle)
# 4.2.2.2.3
# no-op ? XXX
snmpEngine.observer.storeExecutionContext(
snmpEngine, 'rfc3412.receiveMessage:response',
dict(transportDomain=transportDomain,
transportAddress=transportAddress,
wholeMsg=wholeMsg,
messageProcessingModel=messageProcessingModel,
securityModel=securityModel,
securityName=securityName,
securityLevel=securityLevel,
contextEngineId=contextEngineId,
contextName=contextName,
pdu=PDU)
)
# 4.2.2.2.4
processResponsePdu = cachedParams['cbFun']
processResponsePdu(snmpEngine, messageProcessingModel,
securityModel, securityName, securityLevel,
contextEngineId, contextName, pduVersion,
PDU, statusInformation,
cachedParams['sendPduHandle'],
cachedParams['cbCtx'])
snmpEngine.observer.clearExecutionContext(
snmpEngine, 'rfc3412.receiveMessage:response'
)
debug.logger & debug.flagDsp and debug.logger('receiveMessage: processResponsePdu succeeded')
return restOfWholeMsg
def receiveMessage(
self,
snmpEngine,
transportDomain,
transportAddress,
wholeMsg
):
"""Message dispatcher -- de-serialize message into PDU"""
# 4.2.1.1
snmpInPkts, = self.mibInstrumController.mibBuilder.importSymbols(
'__SNMPv2-MIB', 'snmpInPkts'
)
snmpInPkts.syntax = snmpInPkts.syntax + 1
# 4.2.1.2
try:
restOfWholeMsg = '' # XXX fix decoder non-recursive return
msgVersion = verdec.decodeMessageVersion(wholeMsg)
except PySnmpError:
snmpInAsn1ParseErrs, = self.mibInstrumController.mibBuilder.importSymbols('__SNMPv2-MIB', 'snmpInAsn1ParseErrs')
snmpInAsn1ParseErrs.syntax = snmpInAsn1ParseErrs.syntax + 1
return '' # n.b the whole buffer gets dropped
debug.logger & debug.flagDsp and debug.logger('receiveMessage: msgVersion %s, msg decoded' % msgVersion)
messageProcessingModel = msgVersion
mpHandler = snmpEngine.messageProcessingSubsystems.get(
int(messageProcessingModel)
)
if mpHandler is None:
snmpInBadVersions, = self.mibInstrumController.mibBuilder.importSymbols('__SNMPv2-MIB', 'snmpInBadVersions')
snmpInBadVersions.syntax = snmpInBadVersions.syntax + 1
return restOfWholeMsg
# 4.2.1.3 -- no-op
# 4.2.1.4
try:
( messageProcessingModel,
securityModel,
securityName,
securityLevel,
contextEngineId,
contextName,
pduVersion,
PDU,
pduType,
sendPduHandle,
maxSizeResponseScopedPDU,
statusInformation,
stateReference ) = mpHandler.prepareDataElements(
snmpEngine,
transportDomain,
transportAddress,
wholeMsg
)
debug.logger & debug.flagDsp and debug.logger('receiveMessage: MP succeded')
except error.StatusInformation, statusInformation:
if statusInformation.has_key('sendPduHandle'):
# Dropped REPORT -- re-run pending reqs queue as some
# of them may be waiting for this REPORT
debug.logger & debug.flagDsp and debug.logger('receiveMessage: MP failed, statusInformation %s' % statusInformation)
self.__expireRequest(
snmpEngine,
self.__cachePop(statusInformation['sendPduHandle']),
statusInformation
)
return restOfWholeMsg
def receiveMessage(self, snmpEngine, transportDomain, transportAddress,
wholeMsg):
"""Message dispatcher -- de-serialize message into PDU"""
# 4.2.1.1
snmpInPkts, = self.mibInstrumController.mibBuilder.importSymbols(
'__SNMPv2-MIB', 'snmpInPkts')
snmpInPkts.syntax = snmpInPkts.syntax + 1
# 4.2.1.2
try:
restOfWholeMsg = '' # XXX fix decoder non-recursive return
msgVersion = verdec.decodeMessageVersion(wholeMsg)
except PySnmpError:
snmpInAsn1ParseErrs, = self.mibInstrumController.mibBuilder.importSymbols(
'__SNMPv2-MIB', 'snmpInAsn1ParseErrs')
snmpInAsn1ParseErrs.syntax = snmpInAsn1ParseErrs.syntax + 1
return '' # n.b the whole buffer gets dropped
debug.logger & debug.flagDsp and debug.logger(
'receiveMessage: msgVersion %s, msg decoded' % msgVersion)
messageProcessingModel = msgVersion
mpHandler = snmpEngine.messageProcessingSubsystems.get(
int(messageProcessingModel))
if mpHandler is None:
snmpInBadVersions, = self.mibInstrumController.mibBuilder.importSymbols(
'__SNMPv2-MIB', 'snmpInBadVersions')
snmpInBadVersions.syntax = snmpInBadVersions.syntax + 1
return restOfWholeMsg
# 4.2.1.3 -- no-op
# 4.2.1.4
try:
(messageProcessingModel, securityModel, securityName,
securityLevel, contextEngineId, contextName, pduVersion, PDU,
pduType, sendPduHandle, maxSizeResponseScopedPDU,
statusInformation,
stateReference) = mpHandler.prepareDataElements(
snmpEngine, transportDomain, transportAddress, wholeMsg)
debug.logger & debug.flagDsp and debug.logger(
'receiveMessage: MP succeded')
except error.StatusInformation as statusInformation:
if statusInformation.has_key('sendPduHandle'):
# Dropped REPORT -- re-run pending reqs queue as some
# of them may be waiting for this REPORT
debug.logger & debug.flagDsp and debug.logger(
'receiveMessage: MP failed, statusInformation %s' %
statusInformation)
self.__expireRequest(
snmpEngine,
self.__cachePop(statusInformation['sendPduHandle']),
statusInformation)
return restOfWholeMsg
debug.logger & debug.flagDsp and debug.logger(
'receiveMessage: PDU %s' % PDU.prettyPrint())
# 4.2.2
if sendPduHandle is None:
# 4.2.2.1 (request or notification)
debug.logger & debug.flagDsp and debug.logger(
'receiveMessage: pduType %s' % pduType)
# 4.2.2.1.1
processPdu = self.getRegisteredApp(contextEngineId, pduType)
# 4.2.2.1.2
if processPdu is None:
# 4.2.2.1.2.a
snmpUnknownPDUHandlers, = self.mibInstrumController.mibBuilder.importSymbols(
'__SNMP-MPD-MIB', 'snmpUnknownPDUHandlers')
snmpUnknownPDUHandlers.syntax = snmpUnknownPDUHandlers.syntax + 1
# 4.2.2.1.2.b
statusInformation = {
'errorIndication': 'unknownPDUHandler',
'oid': snmpUnknownPDUHandlers.name,
'val': snmpUnknownPDUHandlers.syntax
}
debug.logger & debug.flagDsp and debug.logger(
'receiveMessage: unhandled PDU type')
# XXX fails on unknown PDU
try:
(destTransportDomain, destTransportAddress,
outgoingMessage) = mpHandler.prepareResponseMessage(
snmpEngine, messageProcessingModel, securityModel,
securityName, securityLevel, contextEngineId,
contextName, pduVersion, PDU,
maxSizeResponseScopedPDU, stateReference,
statusInformation)
except error.StatusInformation as statusInformation:
debug.logger & debug.flagDsp and debug.logger(
'receiveMessage: report failed, statusInformation %s' %
statusInformation)
return restOfWholeMsg
# 4.2.2.1.2.c
try:
snmpEngine.transportDispatcher.sendMessage(
outgoingMessage, destTransportDomain,
destTransportAddress)
except PySnmpError: # XXX
pass
debug.logger & debug.flagDsp and debug.logger(
'receiveMessage: reporting succeeded')
# 4.2.2.1.2.d
return restOfWholeMsg
else:
# Pass transport info to app
if stateReference is not None:
self.__transportInfo[stateReference] = (transportDomain,
transportAddress)
# 4.2.2.1.3
processPdu(snmpEngine, messageProcessingModel, securityModel,
securityName, securityLevel, contextEngineId,
contextName, pduVersion, PDU,
maxSizeResponseScopedPDU, stateReference)
if stateReference is not None:
del self.__transportInfo[stateReference]
debug.logger & debug.flagDsp and debug.logger(
'receiveMessage: processPdu succeeded')
return restOfWholeMsg
else:
# 4.2.2.2 (response)
# 4.2.2.2.1
cachedParams = self.__cachePop(sendPduHandle)
# 4.2.2.2.2
if cachedParams is None:
snmpUnknownPDUHandlers, = self.mibInstrumController.mibBuilder.importSymbols(
'__SNMP-MPD-MIB', 'snmpUnknownPDUHandlers')
snmpUnknownPDUHandlers.syntax = snmpUnknownPDUHandlers.syntax + 1
return restOfWholeMsg
debug.logger & debug.flagDsp and debug.logger(
'receiveMessage: cache read by sendPduHandle %s' %
sendPduHandle)
# 4.2.2.2.3
# no-op ? XXX
# 4.2.2.2.4
processResponsePdu, timeoutAt, cbCtx = cachedParams[
'expectResponse']
processResponsePdu(snmpEngine, messageProcessingModel,
securityModel, securityName, securityLevel,
contextEngineId, contextName, pduVersion, PDU,
statusInformation,
cachedParams['sendPduHandle'], cbCtx)
debug.logger & debug.flagDsp and debug.logger(
'receiveMessage: processResponsePdu succeeded')
return restOfWholeMsg
def receiveMessage(self, snmpEngine, transportDomain,
transportAddress, wholeMsg):
"""Message dispatcher -- de-serialize message into PDU"""
mibBuilder = self.mibInstrumController.mibBuilder
# 4.2.1.1
snmpInPkts, = mibBuilder.importSymbols(
'__SNMPv2-MIB', 'snmpInPkts')
snmpInPkts.syntax += 1
restOfWholeMsg = null # XXX fix decoder non-recursive return
# 4.2.1.2
try:
msgVersion = verdec.decodeMessageVersion(wholeMsg)
except error.ProtocolError:
snmpInASNParseErrs, = mibBuilder.importSymbols(
'__SNMPv2-MIB', 'snmpInASNParseErrs')
snmpInASNParseErrs.syntax += 1
return null # n.b the whole buffer gets dropped
debug.logger & debug.FLAG_DSP and debug.logger(
'receiveMessage: msgVersion %s, msg decoded' % msgVersion)
messageProcessingModel = msgVersion
try:
mpHandler = snmpEngine.messageProcessingSubsystems[
int(messageProcessingModel)]
except KeyError:
snmpInBadVersions, = mibBuilder.importSymbols(
'__SNMPv2-MIB', 'snmpInBadVersions')
snmpInBadVersions.syntax += 1
return restOfWholeMsg
# 4.2.1.3 -- no-op
# 4.2.1.4
try:
(messageProcessingModel,
securityModel,
securityName,
securityLevel,
contextEngineId,
contextName,
pduVersion,
PDU,
pduType,
sendPduHandle,
maxSizeResponseScopedPDU,
statusInformation,
stateReference) = mpHandler.prepareDataElements(
snmpEngine, transportDomain, transportAddress, wholeMsg)
debug.logger & debug.FLAG_DSP and debug.logger(
'receiveMessage: MP succeded')
except error.StatusInformation as exc:
statusInformation = exc
if 'sendPduHandle' in statusInformation:
# Dropped REPORT -- re-run pending reqs queue as some
# of them may be waiting for this REPORT
debug.logger & debug.FLAG_DSP and debug.logger(
'receiveMessage: MP failed, statusInformation %s, '
'forcing retry' % statusInformation)
self.__expireRequest(
statusInformation['sendPduHandle'],
self._cache.pop(statusInformation['sendPduHandle']),
snmpEngine,
statusInformation)
return restOfWholeMsg
except PyAsn1Error as exc:
debug.logger & debug.FLAG_MP and debug.logger(
'receiveMessage: %s' % exc)
snmpInASNParseErrs, = mibBuilder.importSymbols(
'__SNMPv2-MIB', 'snmpInASNParseErrs')
snmpInASNParseErrs.syntax += 1
return restOfWholeMsg
debug.logger & debug.FLAG_DSP and debug.logger(
'receiveMessage: PDU %s' % PDU.prettyPrint())
# 4.2.2
if sendPduHandle is None:
# 4.2.2.1 (request or notification)
debug.logger & debug.FLAG_DSP and debug.logger(
'receiveMessage: pduType %s' % pduType)
# 4.2.2.1.1
processPdu = self.getRegisteredApp(contextEngineId, pduType)
# 4.2.2.1.2
if processPdu is None:
# 4.2.2.1.2.a
snmpUnknownPDUHandlers, = importSymbols(
'__SNMP-MPD-MIB', 'snmpUnknownPDUHandlers')
snmpUnknownPDUHandlers.syntax += 1
# 4.2.2.1.2.b
statusInformation = {
'errorIndication': errind.unknownPDUHandler,
'oid': snmpUnknownPDUHandlers.name,
'val': snmpUnknownPDUHandlers.syntax
}
debug.logger & debug.FLAG_DSP and debug.logger(
'receiveMessage: unhandled PDU type')
# 4.2.2.1.2.c
try:
(destTransportDomain,
destTransportAddress,
outgoingMessage) = mpHandler.prepareResponseMessage(
snmpEngine, messageProcessingModel,
securityModel, securityName, securityLevel,
contextEngineId, contextName, pduVersion,
PDU, maxSizeResponseScopedPDU, stateReference,
statusInformation)
snmpEngine.transportDispatcher.sendMessage(
outgoingMessage, destTransportDomain,
destTransportAddress)
except PySnmpError as exc:
debug.logger & debug.FLAG_DSP and debug.logger(
'receiveMessage: report failed, statusInformation %s' % exc)
else:
debug.logger & debug.FLAG_DSP and debug.logger(
'receiveMessage: reporting succeeded')
# 4.2.2.1.2.d
return restOfWholeMsg
else:
snmpEngine.observer.storeExecutionContext(
snmpEngine, 'rfc3412.receiveMessage:request',
dict(transportDomain=transportDomain,
transportAddress=transportAddress,
wholeMsg=wholeMsg,
messageProcessingModel=messageProcessingModel,
securityModel=securityModel,
securityName=securityName,
securityLevel=securityLevel,
contextEngineId=contextEngineId,
contextName=contextName,
pdu=PDU))
# pass transport info to app (legacy)
if stateReference is not None:
self._transportInfo[stateReference] = (
transportDomain, transportAddress)
# 4.2.2.1.3 (asynchronous function)
processPdu(
snmpEngine, messageProcessingModel, securityModel,
securityName, securityLevel, contextEngineId,
contextName, pduVersion, PDU, maxSizeResponseScopedPDU,
stateReference)
snmpEngine.observer.clearExecutionContext(
snmpEngine, 'rfc3412.receiveMessage:request')
# legacy
if stateReference is not None:
del self._transportInfo[stateReference]
debug.logger & debug.FLAG_DSP and debug.logger(
'receiveMessage: processPdu initiated')
return restOfWholeMsg
else:
# 4.2.2.2 (response)
# 4.2.2.2.1
cachedParams = self._cache.pop(sendPduHandle)
# 4.2.2.2.2
if cachedParams is None:
snmpUnknownPDUHandlers, = mibBuilder.importSymbols(
'__SNMP-MPD-MIB', 'snmpUnknownPDUHandlers')
snmpUnknownPDUHandlers.syntax += 1
return restOfWholeMsg
debug.logger & debug.FLAG_DSP and debug.logger(
'receiveMessage: cache read by sendPduHandle %s' % sendPduHandle)
# 4.2.2.2.3
# no-op ? XXX
snmpEngine.observer.storeExecutionContext(
snmpEngine, 'rfc3412.receiveMessage:response',
dict(transportDomain=transportDomain,
transportAddress=transportAddress,
wholeMsg=wholeMsg,
messageProcessingModel=messageProcessingModel,
securityModel=securityModel,
securityName=securityName,
securityLevel=securityLevel,
contextEngineId=contextEngineId,
contextName=contextName,
pdu=PDU))
# 4.2.2.2.4
processResponsePdu = cachedParams['cbFun']
processResponsePdu(
snmpEngine, messageProcessingModel, securityModel,
securityName, securityLevel, contextEngineId, contextName,
pduVersion, PDU, statusInformation,
cachedParams['sendPduHandle'],
cachedParams['cbCtx'])
snmpEngine.observer.clearExecutionContext(
snmpEngine, 'rfc3412.receiveMessage:response')
debug.logger & debug.FLAG_DSP and debug.logger(
'receiveMessage: processResponsePdu succeeded')
return restOfWholeMsg