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# PDU v1/v2c two-way proxy
from pysnmp.proto import rfc3411, error
from pysnmp.proto.api import v1, v2c
from pysnmp.smi import exval
# 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
}
__sysUpTime = (1,3,6,1,2,1,1,3)
__null = v1.Null('')
# 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
}
def v1ToV2(v1Pdu, origV2Pdu=None):
pduType = v1Pdu.tagSet
v2Pdu = __v1ToV2PduMap[pduType].clone()
v2c.apiPDU.setDefaults(v2Pdu)
v2VarBinds = []
# 3.1
if rfc3411.notificationClassPDUs.has_key(pduType):
# 3.1.1
sysUpTime = v1.apiTrapPDU.getTimeStamp(v1Pdu)
# 3.1.2
genericTrap = v1.apiTrapPDU.getGenericTrap(v1Pdu)
if genericTrap == 6:
snmpTrapOID = v1.apiTrapPDU.getEnterprise(v1Pdu) + (0,) + \
v1.apiTrapPDU.getSpecificTrap(v1Pdu)
# 3.1.3
else:
snmpTrapOID = __v1ToV2TrapMap[genericTrap]
v2VarBinds.append((__sysUpTime, sysUpTime))
v2VarBinds.append((snmpTrapOID, __null))
# 3.1.4 --> done below
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 rfc3411.responseClassPDUs.has_key(pduType):
# 4.1.2.2 --> one-to-one mapping
v2c.apiPDU.setErrorStatus(
v2Pdu, int(v1.apiPDU.getErrorStatus(v1Pdu))
)
v2c.apiPDU.setErrorIndex(
v2Pdu, int(v1.apiPDU.getErrorIndex(v1Pdu))
)
# 4.1.2.1 --> no-op
if not rfc3411.notificationClassPDUs.has_key(pduType):
v2c.apiPDU.setRequestID(v2Pdu, long(v1.apiPDU.getRequestID(v1Pdu)))
v2c.apiPDU.setVarBinds(v2Pdu, v2VarBinds)
return v2Pdu
def v2ToV1(v2Pdu, origV1Pdu=None):
pduType = v2Pdu.tagSet
v1Pdu = __v2ToV1PduMap[pduType].clone()
v2VarBinds = v2c.apiPDU.getVarBinds(v2Pdu)
v1VarBinds = []
if rfc3411.notificationClassPDUs.has_key(pduType):
v1.apiTrapPDU.setDefaults(v1Pdu)
else:
v1.apiPDU.setDefaults(v1Pdu)
# 3.2
if rfc3411.notificationClassPDUs.has_key(pduType):
# 3.2.1
snmpTrapOID = v2VarBinds[1][0]
if __v2ToV1TrapMap.has_key(snmpTrapOID):
for oid, val in v2VarBinds:
# snmpTrapEnterprise
if oid == (1, 3, 6, 1, 6, 3, 1, 1, 4, 3, 0):
v1.apiTrapPDU.setEnterprise(v1Pdu, val)
break
else:
# snmpTraps
v1.apiTrapPDU.setEnterprise(v1Pdu, (1, 3, 6, 1, 6, 3, 1, 1, 5))
else:
if snmpTrapOID[-2] == 0:
v1.apiTrapPDU.setEnterprise(v1Pdu, snmpTrapOID[:-2])
else:
v1.apiTrapPDU.setEnterprise(v1Pdu, snmpTrapOID[:-1])
# 3.2.2
for oid, val in v2VarBinds:
# snmpTrapAddress
if oid == (1, 3, 6, 1, 6, 3, 18, 1, 3, 0):
v1.apiTrapPDU.setAgentAddr(v1Pdu, val)
break
else:
v1.apiTrapPDU.setAgentAddr(v1Pdu, '0.0.0.0')
# 3.2.3
if __v2ToV1TrapMap.has_key(snmpTrapOID):
v1.apiTrapPDU.setGenericTrap(v1Pdu, __v2ToV1TrapMap[snmpTrapOID])
else:
v1.apiTrapPDU.setGenericTrap(v1Pdu, 0)
# 3.2.4
if __v2ToV1TrapMap.has_key(snmpTrapOID):
v1.apiTrapPDU.setSpecificTrap(v1Pdu, 0)
else:
v1.apiTrapPDU.setSpecificTrap(v1Pdu, snmpTrapOID[-1])
# 3.2.5
v1.apiTrapPDU.setTimeStamp(v1Pdu, v2VarBinds[0][1])
v2VarBinds = v2VarBinds[2:]
# 3.2.6 --> done below
if rfc3411.responseClassPDUs.has_key(pduType):
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 exval.noSuchInstance.tagSet == val.tagSet or \
exval.noSuchObject.tagSet == val.tagSet or \
exval.endOfMib.tagSet == val.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[v2ErrorStatus]
)
v1.apiPDU.setErrorIndex(v1Pdu, v2c.apiPDU.getErrorIndex(v2Pdu))
# Translate Var-Binds
for oid, v2Val in v2VarBinds:
# 2.1.1.11
if v2Val.tagSet == v2c.IpAddress.tagSet:
v1Val = v1.NetworkAddress().setComponentByPosition(
0, __v2ToV1ValueMap[v2Val.tagSet].clone(v2Val)
)
else:
v1Val = __v2ToV1ValueMap[v2Val.tagSet].clone(v2Val)
v1VarBinds.append((oid, v1Val))
if rfc3411.notificationClassPDUs.has_key(pduType):
v1.apiTrapPDU.setVarBinds(v1Pdu, v1VarBinds)
else:
v1.apiPDU.setVarBinds(v1Pdu, v1VarBinds)
v1.apiPDU.setRequestID(
v1Pdu, v2c.apiPDU.getRequestID(v2Pdu)
)
return v1Pdu
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