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#
# This file is part of pysnmp software.
#
# Copyright (c) 2005-2019, Ilya Etingof <etingof@gmail.com>
# License: http://snmplabs.com/pysnmp/license.html
#
from pysnmp import debug
from pysnmp.proto import error
from pysnmp.proto import rfc1905
from pysnmp.proto import rfc3411
from pysnmp.proto.api import v1
from pysnmp.proto.api import v2c
# 2.1.1
V1_TO_V2_VALUE_MAP = {
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()
}
V2_TO_V1_VALUE_MAP = { # 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
V1_TO_V2_PDU_MAP = {
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()
}
V2_TO_V1_PDU_MAP = {
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
V1_TO_V2_TRAP_MAP = {
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)
}
V2_TO_V1_TRAP_MAP = {
(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
V2_TO_V1_ERROR_MAP = {
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, snmpTrapCommunity=''):
pduType = v1Pdu.tagSet
v2Pdu = V1_TO_V2_PDU_MAP[pduType].clone()
debug.logger & debug.FLAG_PRX and debug.logger(
'v1ToV2: v1Pdu %s' % v1Pdu.prettyPrint())
v2VarBinds = []
# 3.1
if pduType in rfc3411.NOTIFICATION_CLASS_PDUS:
# 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(V1_TO_V2_TRAP_MAP[genericTrap])
# 3.1.4
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(snmpTrapCommunity)))
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, V1_TO_V2_VALUE_MAP[v1Val.tagSet].clone(v1Val)))
if pduType not in rfc3411.NOTIFICATION_CLASS_PDUS:
errorStatus = int(v1.apiPDU.getErrorStatus(v1Pdu))
errorIndex = int(v1.apiPDU.getErrorIndex(v1Pdu, muteErrors=True))
if pduType in rfc3411.RESPONSE_CLASS_PDUS:
# 4.1.2.2.1&2
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]
# partial one-to-one mapping - 4.2.1
v2c.apiPDU.setErrorStatus(v2Pdu, errorStatus)
v2c.apiPDU.setErrorIndex(v2Pdu, errorIndex)
v2c.apiPDU.setRequestID(v2Pdu, int(v1.apiPDU.getRequestID(v1Pdu)))
# 4.1.2.1 --> no-op
else:
v2c.apiPDU.setDefaults(v2Pdu)
v2c.apiPDU.setVarBinds(v2Pdu, v2VarBinds)
debug.logger & debug.FLAG_PRX and debug.logger(
'v1ToV2: v2Pdu %s' % v2Pdu.prettyPrint())
return v2Pdu
def v2ToV1(v2Pdu, origV1Pdu=None):
debug.logger & debug.FLAG_PRX and debug.logger(
'v2ToV1: v2Pdu %s' % v2Pdu.prettyPrint())
pduType = v2Pdu.tagSet
if pduType in V2_TO_V1_PDU_MAP:
v1Pdu = V2_TO_V1_PDU_MAP[pduType].clone()
else:
raise error.ProtocolError('Unsupported PDU type')
v2VarBinds = v2c.apiPDU.getVarBinds(v2Pdu)
v1VarBinds = []
zeroInt = v1.Integer(0)
# 3.2
if pduType in rfc3411.NOTIFICATION_CLASS_PDUS:
if len(v2VarBinds) < 2:
raise error.ProtocolError(
'SNMP v2c TRAP PDU requires at least two var-binds')
# 3.2.1
snmpTrapOID, snmpTrapOIDParam = v2VarBinds[1]
if snmpTrapOID != v2c.apiTrapPDU.snmpTrapOID:
raise error.ProtocolError('Second OID not snmpTrapOID')
if snmpTrapOIDParam in V2_TO_V1_TRAP_MAP:
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:
# v2c.OctetString is more constrained
v1.apiTrapPDU.setAgentAddr(v1Pdu, v1.IpAddress(val))
break
else:
v1.apiTrapPDU.setAgentAddr(v1Pdu, v1.IpAddress('0.0.0.0'))
# 3.2.3
if snmpTrapOIDParam in V2_TO_V1_TRAP_MAP:
v1.apiTrapPDU.setGenericTrap(
v1Pdu, V2_TO_V1_TRAP_MAP[snmpTrapOIDParam])
else:
v1.apiTrapPDU.setGenericTrap(v1Pdu, 6)
# 3.2.4
if snmpTrapOIDParam in V2_TO_V1_TRAP_MAP:
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 V2_TO_V1_TRAP_MAP 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.RESPONSE_CLASS_PDUS:
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 -= 1
# 4.1.2.3.1
v2ErrorStatus = v2c.apiPDU.getErrorStatus(v2Pdu)
if v2ErrorStatus:
v1.apiPDU.setErrorStatus(
v1Pdu, V2_TO_V1_ERROR_MAP.get(v2ErrorStatus, 5))
v1.apiPDU.setErrorIndex(v1Pdu, v2c.apiPDU.getErrorIndex(v2Pdu, muteErrors=True))
elif pduType in rfc3411.CONFIRMED_CLASS_PDUS:
v1.apiPDU.setErrorStatus(v1Pdu, 0)
v1.apiPDU.setErrorIndex(v1Pdu, 0)
# Translate Var-Binds
if (pduType in rfc3411.RESPONSE_CLASS_PDUS and
v1.apiPDU.getErrorStatus(v1Pdu)):
v1VarBinds = v1.apiPDU.getVarBinds(origV1Pdu)
else:
for oid, v2Val in v2VarBinds:
v1VarBinds.append(
(oid, V2_TO_V1_VALUE_MAP[v2Val.tagSet].clone(v2Val))
)
if pduType in rfc3411.NOTIFICATION_CLASS_PDUS:
v1.apiTrapPDU.setVarBinds(v1Pdu, v1VarBinds)
else:
v1.apiPDU.setVarBinds(v1Pdu, v1VarBinds)
v1.apiPDU.setRequestID(
v1Pdu, v2c.apiPDU.getRequestID(v2Pdu)
)
debug.logger & debug.FLAG_PRX and debug.logger(
'v2ToV1: v1Pdu %s' % v1Pdu.prettyPrint())
return v1Pdu
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