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# PDU v1/v2c two-way proxy
from pysnmp.proto import rfc1905, rfc3411, error
from pysnmp.proto.api import v1, v2c
from pysnmp import debug
# 2.1.1
__v1ToV2ValueMap = {
v1.Integer.tagSet: v2c.Integer32(),
v1.OctetString.tagSet: v2c.OctetString(),
v1.Null.tagSet: v2c.Null(),
v1.ObjectIdentifier.tagSet: v2c.ObjectIdentifier(),
v1.IpAddress.tagSet: v2c.IpAddress(),
v1.Counter.tagSet: v2c.Counter32(),
v1.Gauge.tagSet: v2c.Gauge32(),
v1.TimeTicks.tagSet: v2c.TimeTicks(),
v1.Opaque.tagSet: v2c.Opaque()
}
__v2ToV1ValueMap = { # XXX do not re-create same-type items?
v2c.Integer32.tagSet: v1.Integer(),
v2c.OctetString.tagSet: v1.OctetString(),
v2c.Null.tagSet: v1.Null(),
v2c.ObjectIdentifier.tagSet: v1.ObjectIdentifier(),
v2c.IpAddress.tagSet: v1.IpAddress(),
v2c.Counter32.tagSet: v1.Counter(),
v2c.Gauge32.tagSet: v1.Gauge(),
v2c.TimeTicks.tagSet: v1.TimeTicks(),
v2c.Opaque.tagSet: v1.Opaque()
}
# PDU map
__v1ToV2PduMap = {
v1.GetRequestPDU.tagSet: v2c.GetRequestPDU(),
v1.GetNextRequestPDU.tagSet: v2c.GetNextRequestPDU(),
v1.SetRequestPDU.tagSet: v2c.SetRequestPDU(),
v1.GetResponsePDU.tagSet: v2c.ResponsePDU(),
v1.TrapPDU.tagSet: v2c.SNMPv2TrapPDU()
}
__v2ToV1PduMap = {
v2c.GetRequestPDU.tagSet: v1.GetRequestPDU(),
v2c.GetNextRequestPDU.tagSet: v1.GetNextRequestPDU(),
v2c.SetRequestPDU.tagSet: v1.SetRequestPDU(),
v2c.ResponsePDU.tagSet: v1.GetResponsePDU(),
v2c.SNMPv2TrapPDU.tagSet: v1.TrapPDU(),
v2c.GetBulkRequestPDU.tagSet: v1.GetNextRequestPDU() # 4.1.1
}
# Trap map
__v1ToV2TrapMap = {
0: (1,3,6,1,6,3,1,1,5,1),
1: (1,3,6,1,6,3,1,1,5,2),
2: (1,3,6,1,6,3,1,1,5,3),
3: (1,3,6,1,6,3,1,1,5,4),
4: (1,3,6,1,6,3,1,1,5,5),
5: (1,3,6,1,6,3,1,1,5,6)
}
__v2ToV1TrapMap = {
(1,3,6,1,6,3,1,1,5,1): 0,
(1,3,6,1,6,3,1,1,5,2): 1,
(1,3,6,1,6,3,1,1,5,3): 2,
(1,3,6,1,6,3,1,1,5,4): 3,
(1,3,6,1,6,3,1,1,5,5): 4,
(1,3,6,1,6,3,1,1,5,6): 5
}
# 4.3
__v2ToV1ErrorMap = {
0: 0,
1: 1,
5: 5,
10: 3,
9: 3,
7: 3,
8: 3,
12: 3,
6: 2,
17: 2,
11: 2,
18: 2,
13: 5,
14: 5,
15: 5,
16: 2
}
__zeroInt = v1.Integer(0)
def v1ToV2(v1Pdu, origV2Pdu=None):
pduType = v1Pdu.tagSet
v2Pdu = __v1ToV2PduMap[pduType].clone()
debug.logger & debug.flagPrx and debug.logger('v1ToV2: v1Pdu %s' % v1Pdu.prettyPrint())
v2VarBinds = []
# 3.1
if pduType in rfc3411.notificationClassPDUs:
# 3.1.1
sysUpTime = v1.apiTrapPDU.getTimeStamp(v1Pdu)
# 3.1.2
genericTrap = v1.apiTrapPDU.getGenericTrap(v1Pdu)
if genericTrap == 6:
snmpTrapOIDParam = v1.apiTrapPDU.getEnterprise(v1Pdu) + (0,) + \
(int(v1.apiTrapPDU.getSpecificTrap(v1Pdu)),)
# 3.1.3
else:
snmpTrapOIDParam = v2c.ObjectIdentifier(
__v1ToV2TrapMap[genericTrap]
)
# 3.1.4 (XXX snmpTrapCommunity.0 is missing here)
v2VarBinds.append((v2c.apiTrapPDU.sysUpTime, sysUpTime))
v2VarBinds.append((v2c.apiTrapPDU.snmpTrapOID, snmpTrapOIDParam))
v2VarBinds.append(
(v2c.apiTrapPDU.snmpTrapAddress, v1.apiTrapPDU.getAgentAddr(v1Pdu))
)
v2VarBinds.append((v2c.apiTrapPDU.snmpTrapCommunity, v2c.OctetString("")))
v2VarBinds.append((v2c.apiTrapPDU.snmpTrapEnterprise,
v1.apiTrapPDU.getEnterprise(v1Pdu)))
varBinds = v1.apiTrapPDU.getVarBinds(v1Pdu)
else:
varBinds = v1.apiPDU.getVarBinds(v1Pdu)
# Translate Var-Binds
for oid, v1Val in varBinds:
# 2.1.1.11
if v1Val.tagSet == v1.NetworkAddress.tagSet:
v1Val = v1Val.getComponent()
v2VarBinds.append(
(oid, __v1ToV2ValueMap[v1Val.tagSet].clone(v1Val))
)
if pduType in rfc3411.responseClassPDUs:
# 4.1.2.2.1&2
errorStatus = int(v1.apiPDU.getErrorStatus(v1Pdu))
errorIndex = int(v1.apiPDU.getErrorIndex(v1Pdu, muteErrors=True))
if errorStatus == 2: # noSuchName
if origV2Pdu.tagSet == v2c.GetNextRequestPDU.tagSet:
v2VarBinds = [
(o, rfc1905.endOfMibView) for o, v in v2VarBinds
]
else:
v2VarBinds = [
(o, rfc1905.noSuchObject) for o, v in v2VarBinds
]
v2c.apiPDU.setErrorStatus(v2Pdu, 0)
v2c.apiPDU.setErrorIndex(v2Pdu, 0)
else:
# partial one-to-one mapping - 4.2.1
v2c.apiPDU.setErrorStatus(v2Pdu, errorStatus)
v2c.apiPDU.setErrorIndex(v2Pdu, errorIndex)
# 4.1.2.1 --> no-op
elif pduType in rfc3411.confirmedClassPDUs:
v2c.apiPDU.setErrorStatus(v2Pdu, 0)
v2c.apiPDU.setErrorIndex(v2Pdu, 0)
if pduType not in rfc3411.notificationClassPDUs:
v2c.apiPDU.setRequestID(v2Pdu, int(v1.apiPDU.getRequestID(v1Pdu)))
v2c.apiPDU.setVarBinds(v2Pdu, v2VarBinds)
debug.logger & debug.flagPrx and debug.logger('v1ToV2: v2Pdu %s' % v2Pdu.prettyPrint())
return v2Pdu
def v2ToV1(v2Pdu, origV1Pdu=None):
debug.logger & debug.flagPrx and debug.logger('v2ToV1: v2Pdu %s' % v2Pdu.prettyPrint())
pduType = v2Pdu.tagSet
if pduType in __v2ToV1PduMap:
v1Pdu = __v2ToV1PduMap[pduType].clone()
else:
raise error.ProtocolError('Unsupported PDU type')
v2VarBinds = v2c.apiPDU.getVarBinds(v2Pdu)
v1VarBinds = []
# 3.2
if pduType in rfc3411.notificationClassPDUs:
# 3.2.1
(snmpTrapOID, snmpTrapOIDParam) = v2VarBinds[1]
if snmpTrapOID != v2c.apiTrapPDU.snmpTrapOID:
raise error.ProtocolError('Second OID not snmpTrapOID')
if snmpTrapOIDParam in __v2ToV1TrapMap:
for oid, val in v2VarBinds:
if oid == v2c.apiTrapPDU.snmpTrapEnterprise:
v1.apiTrapPDU.setEnterprise(v1Pdu, val)
break
else:
# snmpTraps
v1.apiTrapPDU.setEnterprise(v1Pdu, (1, 3, 6, 1, 6, 3, 1, 1, 5))
else:
if snmpTrapOIDParam[-2] == 0:
v1.apiTrapPDU.setEnterprise(v1Pdu, snmpTrapOIDParam[:-2])
else:
v1.apiTrapPDU.setEnterprise(v1Pdu, snmpTrapOIDParam[:-1])
# 3.2.2
for oid, val in v2VarBinds:
# snmpTrapAddress
if oid == v2c.apiTrapPDU.snmpTrapAddress:
v1.apiTrapPDU.setAgentAddr(v1Pdu, val)
break
else:
v1.apiTrapPDU.setAgentAddr(v1Pdu, v1.apiTrapPDU.agentAddress)
# 3.2.3
if snmpTrapOIDParam in __v2ToV1TrapMap:
v1.apiTrapPDU.setGenericTrap(v1Pdu, __v2ToV1TrapMap[snmpTrapOIDParam])
else:
v1.apiTrapPDU.setGenericTrap(v1Pdu, 6)
# 3.2.4
if snmpTrapOIDParam in __v2ToV1TrapMap:
v1.apiTrapPDU.setSpecificTrap(v1Pdu, __zeroInt)
else:
v1.apiTrapPDU.setSpecificTrap(v1Pdu, snmpTrapOIDParam[-1])
# 3.2.5
v1.apiTrapPDU.setTimeStamp(v1Pdu, v2VarBinds[0][1])
__v2VarBinds = []
for oid, val in v2VarBinds[2:]:
if oid in __v2ToV1TrapMap or \
oid in (v2c.apiTrapPDU.sysUpTime,
v2c.apiTrapPDU.snmpTrapAddress,
v2c.apiTrapPDU.snmpTrapEnterprise):
continue
__v2VarBinds.append((oid, val))
v2VarBinds = __v2VarBinds
# 3.2.6 --> done below
else:
v1.apiPDU.setErrorStatus(v1Pdu, __zeroInt)
v1.apiPDU.setErrorIndex(v1Pdu, __zeroInt)
if pduType in rfc3411.responseClassPDUs:
idx = len(v2VarBinds)-1
while idx >= 0:
# 4.1.2.1
oid, val = v2VarBinds[idx]
if v2c.Counter64.tagSet == val.tagSet:
if origV1Pdu.tagSet == v1.GetRequestPDU.tagSet:
v1.apiPDU.setErrorStatus(v1Pdu, 2)
v1.apiPDU.setErrorIndex(v1Pdu, idx+1)
break
elif origV1Pdu.tagSet == v1.GetNextRequestPDU.tagSet:
raise error.StatusInformation(idx=idx, pdu=v2Pdu)
else:
raise error.ProtocolError('Counter64 on the way')
# 4.1.2.2.1&2
if val.tagSet in (v2c.NoSuchObject.tagSet,
v2c.NoSuchInstance.tagSet,
v2c.EndOfMibView.tagSet):
v1.apiPDU.setErrorStatus(v1Pdu, 2)
v1.apiPDU.setErrorIndex(v1Pdu, idx+1)
idx = idx - 1
# 4.1.2.3.1
v2ErrorStatus = v2c.apiPDU.getErrorStatus(v2Pdu)
if v2ErrorStatus:
v1.apiPDU.setErrorStatus(
v1Pdu, __v2ToV1ErrorMap.get(v2ErrorStatus, 5)
)
v1.apiPDU.setErrorIndex(v1Pdu, v2c.apiPDU.getErrorIndex(v2Pdu, muteErrors=True))
elif pduType in rfc3411.confirmedClassPDUs:
v1.apiPDU.setErrorStatus(v1Pdu, 0)
v1.apiPDU.setErrorIndex(v1Pdu, 0)
# Translate Var-Binds
if pduType in rfc3411.responseClassPDUs and \
v1.apiPDU.getErrorStatus(v1Pdu):
v1VarBinds = v1.apiPDU.getVarBinds(origV1Pdu)
else:
for oid, v2Val in v2VarBinds:
v1VarBinds.append(
(oid, __v2ToV1ValueMap[v2Val.tagSet].clone(v2Val))
)
if pduType in rfc3411.notificationClassPDUs:
v1.apiTrapPDU.setVarBinds(v1Pdu, v1VarBinds)
else:
v1.apiPDU.setVarBinds(v1Pdu, v1VarBinds)
v1.apiPDU.setRequestID(
v1Pdu, v2c.apiPDU.getRequestID(v2Pdu)
)
debug.logger & debug.flagPrx and debug.logger('v2ToV1: v1Pdu %s' % v1Pdu.prettyPrint())
return v1Pdu
|
