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from pysnmp.proto import rfc1902, rfc1905, error
from pysnmp.proto.api import v1
from pysnmp.smi import exval
from pyasn1.type import univ, namedtype, namedval
# Shortcuts to SNMP types
Null = univ.Null
ObjectIdentifier = univ.ObjectIdentifier
Integer = rfc1902.Integer
Integer32 = rfc1902.Integer32
OctetString = rfc1902.OctetString
IpAddress = rfc1902.IpAddress
Counter32 = rfc1902.Counter32
Gauge32 = rfc1902.Gauge32
Unsigned32 = rfc1902.Unsigned32
TimeTicks = rfc1902.TimeTicks
Opaque = rfc1902.Opaque
Counter64 = rfc1902.Counter64
Bits = rfc1902.Bits
VarBind = rfc1905.VarBind
VarBindList = rfc1905.VarBindList
GetRequestPDU = rfc1905.GetRequestPDU
GetNextRequestPDU = rfc1905.GetNextRequestPDU
ResponsePDU = GetResponsePDU = rfc1905.ResponsePDU
SetRequestPDU = rfc1905.SetRequestPDU
GetBulkRequestPDU = rfc1905.GetBulkRequestPDU
InformRequestPDU = rfc1905.InformRequestPDU
SNMPv2TrapPDU = TrapPDU = rfc1905.SNMPv2TrapPDU
ReportPDU = rfc1905.ReportPDU
# v2 model uses v1 messaging but it's not defined in v2 MIB
class Message(v1.Message):
componentType = namedtype.NamedTypes(
namedtype.NamedType('version', univ.Integer(namedValues = namedval.NamedValues(('version-2', 1)))),
namedtype.NamedType('community', univ.OctetString()),
namedtype.NamedType('data', rfc1905.PDUs())
)
getNextRequestID = v1.getNextRequestID
apiVarBind = v1.apiVarBind
class PDUAPI(v1.PDUAPI):
def getResponse(self, reqPDU):
rspPDU = ResponsePDU()
self.setDefaults(rspPDU)
self.setRequestID(rspPDU, self.getRequestID(reqPDU))
return rspPDU
def getVarBindTable(self, reqPDU, rspPDU):
varBinds = []
for oid, val in apiPDU.getVarBinds(rspPDU):
if exval.endOfMib.isSameTypeWith(val):
val = None
varBinds.append((oid, val))
return [ varBinds ]
def setEndOfMibError(self, pdu, errorIndex):
varBindList = self.getVarBindList(pdu)
varBindList[errorIndex-1].setComponentByPosition(1, exval.endOfMib)
def setNoSuchInstanceError(self, pdu, errorIndex):
varBindList = self.getVarBindList(pdu)
varBindList[errorIndex-1].setComponentByPosition(1,exval.noSuchInstance)
apiPDU = PDUAPI()
class BulkPDUAPI(PDUAPI):
def setDefaults(self, pdu):
PDUAPI.setDefaults(self, pdu)
pdu.setComponentByPosition(2, 10)
def getNonRepeaters(self, pdu): return pdu.getComponentByPosition(1)
def setNonRepeaters(self, pdu, value): pdu.setComponentByPosition(1, value)
def getMaxRepetitions(self, pdu): return pdu.getComponentByPosition(2)
def setMaxRepetitions(self,pdu,value): pdu.setComponentByPosition(2,value)
def getVarBindTable(self, reqPDU, rspPDU):
nonRepeaters = int(self.getNonRepeaters(reqPDU))
N = min(nonRepeaters, len(self.getVarBindList(reqPDU)))
R = max(len(self.getVarBindList(reqPDU))-N, 0)
if R == 0:
M = 0
else:
M = int(min(self.getMaxRepetitions(reqPDU),
(len(apiPDU.getVarBindList(rspPDU))-N))/R)
varBindList = apiPDU.getVarBindList(rspPDU)
varBindRows = []; varBindTable = [ varBindRows ]
# __null = Null()
for idx in range(N):
oid, val = apiVarBind.getOIDVal(varBindList[idx])
if exval.endOfMib.isSameTypeWith(val):
val = None
# val = __null
varBindRows.append((oid, val))
for rowIdx in range(M):
if len(varBindTable) < rowIdx+1:
varBindTable.append([])
varBindRow = varBindTable[-1]
for colIdx in range(R):
while rowIdx and len(varBindRow) < N:
varBindRow.append(varBindTable[-2][colIdx])
idx = N + rowIdx*R + colIdx
oid, val = apiVarBind.getOIDVal(varBindList[idx])
if exval.endOfMib.isSameTypeWith(val):
val = None
if len(varBindRow) < colIdx+N+1:
varBindRow.append((oid, val))
else:
varBindRow[colIdx] = (oid, val)
return varBindTable
apiBulkPDU = BulkPDUAPI()
class MessageAPI(v1.MessageAPI):
def setDefaults(self, msg):
msg.setComponentByPosition(0, 1)
msg.setComponentByPosition(1, 'public')
return msg
def getResponse(self, reqMsg):
rspMsg = Message()
self.setDefaults(rspMsg)
self.setVersion(rspMsg, self.getVersion(reqMsg))
self.setCommunity(rspMsg, self.getCommunity(reqMsg))
self.setPDU(rspMsg, apiPDU.getResponse(self.getPDU(reqMsg)))
return rspMsg
apiMessage = MessageAPI()
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