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#
# This file is part of pysnmp software.
#
# Copyright (c) 2005-2018, Ilya Etingof <etingof@gmail.com>
# License: http://snmplabs.com/pysnmp/license.html
#
from pyasn1.type import univ
from pysnmp.proto import rfc1155, rfc1157, error
from pysnmp import nextid
# Shortcuts to SNMP types
Integer = univ.Integer
OctetString = univ.OctetString
Null = univ.Null
null = Null('')
ObjectIdentifier = univ.ObjectIdentifier
IpAddress = rfc1155.IpAddress
NetworkAddress = rfc1155.NetworkAddress
Counter = rfc1155.Counter
Gauge = rfc1155.Gauge
TimeTicks = rfc1155.TimeTicks
Opaque = rfc1155.Opaque
VarBind = rfc1157.VarBind
VarBindList = rfc1157.VarBindList
GetRequestPDU = rfc1157.GetRequestPDU
GetNextRequestPDU = rfc1157.GetNextRequestPDU
GetResponsePDU = rfc1157.GetResponsePDU
SetRequestPDU = rfc1157.SetRequestPDU
TrapPDU = rfc1157.TrapPDU
Message = rfc1157.Message
class VarBindAPI(object):
@staticmethod
def setOIDVal(varBind, oidVal):
oid, val = oidVal[0], oidVal[1]
varBind.setComponentByPosition(0, oid)
if val is None:
val = null
varBind.setComponentByPosition(1).getComponentByPosition(1).setComponentByType(val.getTagSet(), val, verifyConstraints=False, matchTags=False, matchConstraints=False, innerFlag=True)
return varBind
@staticmethod
def getOIDVal(varBind):
return varBind[0], varBind[1].getComponent(1)
apiVarBind = VarBindAPI()
getNextRequestID = nextid.Integer(0xffffff)
class PDUAPI(object):
_errorStatus = rfc1157.errorStatus.clone(0)
_errorIndex = Integer(0)
def setDefaults(self, pdu):
pdu.setComponentByPosition(
0, getNextRequestID(), verifyConstraints=False, matchTags=False, matchConstraints=False
)
pdu.setComponentByPosition(
1, self._errorStatus, verifyConstraints=False, matchTags=False, matchConstraints=False
)
pdu.setComponentByPosition(
2, self._errorIndex, verifyConstraints=False, matchTags=False, matchConstraints=False
)
pdu.setComponentByPosition(3)
@staticmethod
def getRequestID(pdu):
return pdu.getComponentByPosition(0)
@staticmethod
def setRequestID(pdu, value):
pdu.setComponentByPosition(0, value)
@staticmethod
def getErrorStatus(pdu):
return pdu.getComponentByPosition(1)
@staticmethod
def setErrorStatus(pdu, value):
pdu.setComponentByPosition(1, value)
@staticmethod
def getErrorIndex(pdu, muteErrors=False):
errorIndex = pdu.getComponentByPosition(2)
if errorIndex > len(pdu[3]):
if muteErrors:
return errorIndex.clone(len(pdu[3]))
raise error.ProtocolError(
'Error index out of range: %s > %s' % (errorIndex, len(pdu[3]))
)
return errorIndex
@staticmethod
def setErrorIndex(pdu, value):
pdu.setComponentByPosition(2, value)
def setEndOfMibError(self, pdu, errorIndex):
self.setErrorIndex(pdu, errorIndex)
self.setErrorStatus(pdu, 2)
def setNoSuchInstanceError(self, pdu, errorIndex):
self.setEndOfMibError(pdu, errorIndex)
@staticmethod
def getVarBindList(pdu):
return pdu.getComponentByPosition(3)
@staticmethod
def setVarBindList(pdu, varBindList):
pdu.setComponentByPosition(3, varBindList)
@staticmethod
def getVarBinds(pdu):
return [apiVarBind.getOIDVal(varBind) for varBind in pdu.getComponentByPosition(3)]
@staticmethod
def setVarBinds(pdu, varBinds):
varBindList = pdu.setComponentByPosition(3).getComponentByPosition(3)
varBindList.clear()
for idx, varBind in enumerate(varBinds):
if isinstance(varBind, VarBind):
varBindList.setComponentByPosition(idx, varBind)
else:
varBindList.setComponentByPosition(idx)
apiVarBind.setOIDVal(
varBindList.getComponentByPosition(idx), varBind
)
def getResponse(self, reqPDU):
rspPDU = GetResponsePDU()
self.setDefaults(rspPDU)
self.setRequestID(rspPDU, self.getRequestID(reqPDU))
return rspPDU
def getVarBindTable(self, reqPDU, rspPDU):
if apiPDU.getErrorStatus(rspPDU) == 2:
varBindRow = []
for varBind in apiPDU.getVarBinds(reqPDU):
varBindRow.append((varBind[0], null))
return [varBindRow]
else:
return [apiPDU.getVarBinds(rspPDU)]
apiPDU = PDUAPI()
class TrapPDUAPI(object):
_networkAddress = None
_entOid = ObjectIdentifier((1, 3, 6, 1, 4, 1, 20408))
_genericTrap = rfc1157.genericTrap.clone('coldStart')
_zeroInt = univ.Integer(0)
_zeroTime = TimeTicks(0)
def setDefaults(self, pdu):
if self._networkAddress is None:
try:
import socket
agentAddress = IpAddress(socket.gethostbyname(socket.gethostname()))
except Exception:
agentAddress = IpAddress('0.0.0.0')
self._networkAddress = NetworkAddress().setComponentByPosition(0, agentAddress)
pdu.setComponentByPosition(0, self._entOid, verifyConstraints=False, matchTags=False, matchConstraints=False)
pdu.setComponentByPosition(1, self._networkAddress, verifyConstraints=False, matchTags=False, matchConstraints=False)
pdu.setComponentByPosition(2, self._genericTrap, verifyConstraints=False, matchTags=False, matchConstraints=False)
pdu.setComponentByPosition(3, self._zeroInt, verifyConstraints=False, matchTags=False, matchConstraints=False)
pdu.setComponentByPosition(4, self._zeroTime, verifyConstraints=False, matchTags=False, matchConstraints=False)
pdu.setComponentByPosition(5)
@staticmethod
def getEnterprise(pdu):
return pdu.getComponentByPosition(0)
@staticmethod
def setEnterprise(pdu, value):
pdu.setComponentByPosition(0, value)
@staticmethod
def getAgentAddr(pdu):
return pdu.getComponentByPosition(1).getComponentByPosition(0)
@staticmethod
def setAgentAddr(pdu, value):
pdu.setComponentByPosition(1).getComponentByPosition(1).setComponentByPosition(0, value)
@staticmethod
def getGenericTrap(pdu):
return pdu.getComponentByPosition(2)
@staticmethod
def setGenericTrap(pdu, value):
pdu.setComponentByPosition(2, value)
@staticmethod
def getSpecificTrap(pdu):
return pdu.getComponentByPosition(3)
@staticmethod
def setSpecificTrap(pdu, value):
pdu.setComponentByPosition(3, value)
@staticmethod
def getTimeStamp(pdu):
return pdu.getComponentByPosition(4)
@staticmethod
def setTimeStamp(pdu, value):
pdu.setComponentByPosition(4, value)
@staticmethod
def getVarBindList(pdu):
return pdu.getComponentByPosition(5)
@staticmethod
def setVarBindList(pdu, varBindList):
pdu.setComponentByPosition(5, varBindList)
@staticmethod
def getVarBinds(pdu):
varBinds = []
for varBind in pdu.getComponentByPosition(5):
varBinds.append(apiVarBind.getOIDVal(varBind))
return varBinds
@staticmethod
def setVarBinds(pdu, varBinds):
varBindList = pdu.setComponentByPosition(5).getComponentByPosition(5)
varBindList.clear()
idx = 0
for varBind in varBinds:
if isinstance(varBind, VarBind):
varBindList.setComponentByPosition(idx, varBind)
else:
varBindList.setComponentByPosition(idx)
apiVarBind.setOIDVal(
varBindList.getComponentByPosition(idx), varBind
)
idx += 1
apiTrapPDU = TrapPDUAPI()
class MessageAPI(object):
_version = rfc1157.version.clone(0)
_community = univ.OctetString('public')
def setDefaults(self, msg):
msg.setComponentByPosition(0, self._version, verifyConstraints=False, matchTags=False, matchConstraints=False)
msg.setComponentByPosition(1, self._community, verifyConstraints=False, matchTags=False, matchConstraints=False)
return msg
@staticmethod
def getVersion(msg):
return msg.getComponentByPosition(0)
@staticmethod
def setVersion(msg, value):
msg.setComponentByPosition(0, value)
@staticmethod
def getCommunity(msg):
return msg.getComponentByPosition(1)
@staticmethod
def setCommunity(msg, value):
msg.setComponentByPosition(1, value)
@staticmethod
def getPDU(msg):
return msg.getComponentByPosition(2).getComponent()
@staticmethod
def setPDU(msg, value):
msg.setComponentByPosition(2).getComponentByPosition(2).setComponentByType(value.getTagSet(), value, verifyConstraints=False, matchTags=False, matchConstraints=False, innerFlag=True)
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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