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|
from sys import version_info
from pysnmp.entity import engine, config
from pysnmp.entity.rfc3413 import cmdgen
from pysnmp.smi.rfc1902 import *
from pysnmp.entity.rfc3413.oneliner.auth import *
from pysnmp.entity.rfc3413.oneliner.target import *
from pysnmp.entity.rfc3413.oneliner.ctx import *
from pysnmp.proto import rfc1905, errind
from pysnmp.smi import view
from pysnmp import nextid, error
from pyasn1.type import univ, base
from pyasn1.compat.octets import null
# obsolete, compatibility symbols
from pysnmp.entity.rfc3413.oneliner.mibvar import MibVariable
# SNMP engine
SnmpEngine = engine.SnmpEngine
nextID = nextid.Integer(0xffffffff)
class AsyncCommandGenerator:
"""Creates asyncore-based SNMP Command Generator object.
This is a high-level wrapper around pure Command Generator
impementation that aims at simplyfing
:py:class:`pysnmp.entity.engine.SnmpEngine`'s Local Configuration
Datastore (:RFC:`2271#section-3.4.2`) management. Typically,
users instantiate `AsyncCommandGenerator` and call its
commmand-specific methods passing them canned Security,
Transport and SNMP Context parameters along with MIB variables
to deal with. `AsyncCommandGenerator` will manage LCD by
applying user-supplied configuratoin parameters and running
requested operation.
See :RFC:`3413#section-3.1` for more information on SNMP
Command Generator purpose, design and supported operations.
"""
_null = univ.Null('')
def _getCache(self, snmpEngine):
cache = snmpEngine.getUserContext('cmdgen_cache')
if cache is None:
cache = {
'auth': {}, 'parm': {}, 'tran': {}, 'addr': {}
}
snmpEngine.setUserContext(cmdgen_cache=cache)
return cache
def getMibViewController(self, snmpEngine):
mibViewController = snmpEngine.getUserContext('mibViewController')
if not mibViewController:
mibViewController = view.MibViewController(
snmpEngine.getMibBuilder()
)
snmpEngine.setUserContext(mibViewController=mibViewController)
return mibViewController
def cfgCmdGen(self, snmpEngine, authData, transportTarget):
cache = self._getCache(snmpEngine)
if isinstance(authData, CommunityData):
if authData.communityIndex not in cache['auth']:
config.addV1System(
snmpEngine,
authData.communityIndex,
authData.communityName,
authData.contextEngineId,
authData.contextName,
authData.tag,
authData.securityName
)
cache['auth'][authData.communityIndex] = authData
elif isinstance(authData, UsmUserData):
authDataKey = authData.userName, authData.securityEngineId
if authDataKey not in cache['auth']:
config.addV3User(
snmpEngine,
authData.userName,
authData.authProtocol, authData.authKey,
authData.privProtocol, authData.privKey,
authData.securityEngineId,
securityName=authData.securityName
)
cache['auth'][authDataKey] = authData
else:
raise error.PySnmpError('Unsupported authentication object')
paramsKey = authData.securityName, \
authData.securityLevel, \
authData.mpModel
if paramsKey in cache['parm']:
paramsName, useCount = cache['parm'][paramsKey]
cache['parm'][paramsKey] = paramsName, useCount + 1
else:
paramsName = 'p%s' % nextID()
config.addTargetParams(
snmpEngine, paramsName,
authData.securityName, authData.securityLevel, authData.mpModel
)
cache['parm'][paramsKey] = paramsName, 1
if transportTarget.transportDomain in cache['tran']:
transport, useCount = cache['tran'][transportTarget.transportDomain]
transportTarget.verifyDispatcherCompatibility(snmpEngine)
cache['tran'][transportTarget.transportDomain] = transport, useCount + 1
elif config.getTransport(snmpEngine, transportTarget.transportDomain):
transportTarget.verifyDispatcherCompatibility(snmpEngine)
else:
transport = transportTarget.openClientMode()
config.addTransport(
snmpEngine,
transportTarget.transportDomain,
transport
)
cache['tran'][transportTarget.transportDomain] = transport, 1
transportKey = ( paramsName,
transportTarget.transportDomain,
transportTarget.transportAddr,
transportTarget.tagList )
if transportKey in cache['addr']:
addrName, useCount = cache['addr'][transportKey]
cache['addr'][transportKey] = addrName, useCount + 1
else:
addrName = 'a%s' % nextID()
config.addTargetAddr(
snmpEngine, addrName,
transportTarget.transportDomain,
transportTarget.transportAddr,
paramsName,
transportTarget.timeout * 100,
transportTarget.retries,
transportTarget.tagList
)
cache['addr'][transportKey] = addrName, 1
return addrName, paramsName
def uncfgCmdGen(self, snmpEngine, authData=None):
cache = self._getCache(snmpEngine)
if authData:
if isinstance(authData, CommunityData):
authDataKey = authData.communityIndex
elif isinstance(authData, UsmUserData):
authDataKey = authData.userName, authData.securityEngineId
else:
raise error.PySnmpError('Unsupported authentication object')
if authDataKey in cache['auth']:
authDataKeys = ( authDataKey, )
else:
raise error.PySnmpError('Unknown authData %s' % (authData,))
else:
authDataKeys = list(cache['auth'].keys())
addrNames, paramsNames = set(), set()
for authDataKey in authDataKeys:
authDataX = cache['auth'][authDataKey]
del cache['auth'][authDataKey]
if isinstance(authDataX, CommunityData):
config.delV1System(
snmpEngine,
authDataX.communityIndex
)
elif isinstance(authDataX, UsmUserData):
config.delV3User(
snmpEngine,
authDataX.userName,
authDataX.securityEngineId
)
else:
raise error.PySnmpError('Unsupported authentication object')
paramsKey = authDataX.securityName, \
authDataX.securityLevel, \
authDataX.mpModel
if paramsKey in cache['parm']:
paramsName, useCount = cache['parm'][paramsKey]
useCount -= 1
if useCount:
cache['parm'][paramsKey] = paramsName, useCount
else:
del cache['parm'][paramsKey]
config.delTargetParams(
snmpEngine, paramsName
)
paramsNames.add(paramsName)
else:
raise error.PySnmpError('Unknown target %s' % (paramsKey,))
addrKeys = [ x for x in cache['addr'] if x[0] == paramsName ]
for addrKey in addrKeys:
addrName, useCount = cache['addr'][addrKey]
useCount -= 1
if useCount:
cache['addr'][addrKey] = addrName, useCount
else:
config.delTargetAddr(snmpEngine, addrName)
addrNames.add(addrKey)
if addrKey[1] in cache['tran']:
transport, useCount = cache['tran'][addrKey[1]]
if useCount > 1:
useCount -= 1
cache['tran'][addrKey[1]] = transport, useCount
else:
config.delTransport(snmpEngine, addrKey[1])
transport.closeTransport()
del cache['tran'][addrKey[1]]
return addrNames, paramsNames
def makeVarBinds(self, snmpEngine, varBinds):
mibViewController = self.getMibViewController(snmpEngine)
__varBinds = []
for varBind in varBinds:
if isinstance(varBind, ObjectType):
pass
elif isinstance(varBind[0], ObjectIdentity):
varBind = ObjectType(*varBind)
elif isinstance(varBind[0][0], tuple): # legacy
varBind = ObjectType(ObjectIdentity(varBind[0][0][0], varBind[0][0][1], *varBind[0][1:]), varBind[1])
else:
varBind = ObjectType(ObjectIdentity(varBind[0]), varBind[1])
__varBinds.append(varBind.resolveWithMib(mibViewController))
return __varBinds
def unmakeVarBinds(self, snmpEngine, varBinds, lookupMib=False):
if lookupMib:
mibViewController = self.getMibViewController(snmpEngine)
varBinds = [ ObjectType(ObjectIdentity(x[0]), x[1]).resolveWithMib(mibViewController) for x in varBinds ]
return varBinds
# Async SNMP apps
def getCmd(self, snmpEngine, authData, transportTarget, contextData,
varBinds, cbInfo, lookupMib=False):
"""Performs SNMP GET query.
Based on passed parameters, prepares SNMP GET packet
(:RFC:`1905#section-4.2.1`) and schedules its transmission by
I/O framework at a later point of time.
Parameters
----------
snmpEngine : :py:class:`~pysnmp.entity.engine.SnmpEngine`
Class instance representing SNMP engine.
authData : :py:class:`~pysnmp.entity.rfc3413.oneliner.auth.CommunityData` or :py:class:`~pysnmp.entity.rfc3413.oneliner.auth.UsmUserData`
Class instance representing SNMP credentials.
transportTarget : :py:class:`~pysnmp.entity.rfc3413.oneliner.target.UdpTransportTarget` or :py:class:`~pysnmp.entity.rfc3413.oneliner.target.Udp6TransportTarget`
Class instance representing transport type along with SNMP peer address.
contextData : :py:class:`~pysnmp.entity.rfc3413.oneliner.ctx.ContextData`
Class instance representing SNMP ContextEngineId and ContextName values.
varBinds : :py:class:`~pysnmp.smi.rfc1902.ObjectType`
One or more class instances representing MIB variables to place
into SNMP request.
cbInfo : tuple
* `cbFun` - user-supplied callable that is invoked to pass
SNMP response data or error to user at a later point of time.
* `cbCtx` - user-supplied object passing additional parameters
to/from `cbFun`. Default is `None`.
Other Parameters
----------------
lookupMib : bool
`lookupMib` - load MIB and resolve response MIB variables at
the cost of slightly reduced performance. Default is `False`.
Notes
-----
User-supplied `cbFun` callable must have the following call
signature:
* snmpEngine (:py:class:`~pysnmp.entity.engine.SnmpEngine`):
Class instance representing SNMP engine.
* sendRequestHandle (int): Unique request identifier. Can be used
for matching multiple ongoing requests with received responses.
* errorIndication (str): True value indicates SNMP engine error.
* errorStatus (str): Non-zero value indicates SNMP PDU error.
* errorIndex (int): Non-zero value refers to *varBinds[errorIndex-1]
* varBinds (tuple): A sequence of
:py:class:`~pysnmp.smi.rfc1902.ObjectType` class instances
representing MIB variables returned in SNMP response.
* `cbCtx` : Original user-supplied object.
Returns
-------
sendRequestHandle : int
Unique request identifier. Can be used for matching received
responses with ongoing requests.
Raises
------
PySnmpError
Or its derivative indicating that an error occurred while
performing SNMP operation.
Examples
--------
>>> from pysnmp.entity.rfc3413.oneliner.cmdgen import *
>>> def cbFun(snmpEngine, sendRequestHandle, errorIndication, errorStatus, errorIndex, varBinds, cbCtx):
... print(errorIndication, errorStatus, errorIndex, varBinds)
>>>
>>> snmpEngine = SnmpEngine()
>>> g = AsyncCommandGenerator()
>>> g.getCmd(snmpEngine,
... CommunityData('public'),
... UdpTransportTarget(('demo.snmplabs.com', 161)),
... ContextData(),
... ObjectType(ObjectIdentity('SNMPv2-MIB', 'sysDescr', 0)),
... (cbFun, None))
>>> snmpEngine.transportDispatcher.runDispatcher()
(None, 0, 0, [ObjectType(ObjectIdentity(ObjectName('1.3.6.1.2.1.1.1.0')), DisplayString('SunOS zeus.snmplabs.com 4.1.3_U1 1 sun4m'))])
>>>
"""
def __cbFun(snmpEngine, sendRequestHandle,
errorIndication, errorStatus, errorIndex,
varBinds, cbCtx):
lookupMib, cbFun, cbCtx = cbCtx
return cbFun(
snmpEngine,
sendRequestHandle,
errorIndication,
errorStatus,
errorIndex,
self.unmakeVarBinds(
snmpEngine, varBinds, lookupMib
),
cbCtx
)
(cbFun, cbCtx) = cbInfo
addrName, paramsName = self.cfgCmdGen(
snmpEngine, authData, transportTarget
)
return cmdgen.GetCommandGenerator().sendVarBinds(
snmpEngine,
addrName,
contextData.contextEngineId,
contextData.contextName,
self.makeVarBinds(snmpEngine, varBinds),
__cbFun,
(lookupMib, cbFun, cbCtx)
)
def setCmd(self, snmpEngine, authData, transportTarget, contextData,
varBinds, cbInfo, lookupMib=False):
def __cbFun(snmpEngine, sendRequestHandle,
errorIndication, errorStatus, errorIndex,
varBinds, cbCtx):
lookupMib, cbFun, cbCtx = cbCtx
return cbFun(
snmpEngine,
sendRequestHandle,
errorIndication,
errorStatus,
errorIndex,
self.unmakeVarBinds(
snmpEngine, varBinds, lookupMib
),
cbCtx
)
(cbFun, cbCtx) = cbInfo
addrName, paramsName = self.cfgCmdGen(
snmpEngine, authData, transportTarget
)
return cmdgen.SetCommandGenerator().sendVarBinds(
snmpEngine,
addrName,
contextData.contextEngineId,
contextData.contextName,
self.makeVarBinds(snmpEngine, varBinds),
__cbFun,
(lookupMib, cbFun, cbCtx)
)
def nextCmd(self, snmpEngine, authData, transportTarget, contextData,
varBinds, cbInfo, lookupMib=False):
def __cbFun(snmpEngine, sendRequestHandle,
errorIndication, errorStatus, errorIndex,
varBindTable, cbCtx):
lookupMib, cbFun, cbCtx = cbCtx
return cbFun(
snmpEngine,
sendRequestHandle,
errorIndication,
errorStatus,
errorIndex,
[ self.unmakeVarBinds(snmpEngine, varBindTableRow, lookupMib) for varBindTableRow in varBindTable ],
cbCtx
)
(cbFun, cbCtx) = cbInfo
addrName, paramsName = self.cfgCmdGen(
snmpEngine, authData, transportTarget
)
return cmdgen.NextCommandGenerator().sendVarBinds(
snmpEngine,
addrName,
contextData.contextEngineId, contextData.contextName,
self.makeVarBinds(snmpEngine, varBinds),
__cbFun,
(lookupMib, cbFun, cbCtx)
)
def bulkCmd(self, snmpEngine, authData, transportTarget, contextData,
nonRepeaters, maxRepetitions, varBinds, cbInfo,
lookupMib=False):
def __cbFun(snmpEngine, sendRequestHandle,
errorIndication, errorStatus, errorIndex,
varBindTable, cbCtx):
lookupMib, cbFun, cbCtx = cbCtx
return cbFun(
snmpEngine,
sendRequestHandle,
errorIndication,
errorStatus,
errorIndex,
[ self.unmakeVarBinds(snmpEngine, varBindTableRow, lookupMib) for varBindTableRow in varBindTable ],
cbCtx
)
(cbFun, cbCtx) = cbInfo
addrName, paramsName = self.cfgCmdGen(
snmpEngine, authData, transportTarget
)
return cmdgen.BulkCommandGenerator().sendVarBinds(
snmpEngine,
addrName,
contextData.contextEngineId,
contextData.contextName,
nonRepeaters, maxRepetitions,
self.makeVarBinds(snmpEngine, varBinds),
__cbFun,
(lookupMib, cbFun, cbCtx)
)
#
# The rest of code in this file belongs to obsolete, compatibility wrappers.
# Never use interfaces below for new applications!
#
class AsynCommandGenerator:
def __init__(self, snmpEngine=None):
if snmpEngine is None:
self.snmpEngine = snmpEngine = engine.SnmpEngine()
else:
self.snmpEngine = snmpEngine
self.__asyncCmdGen = AsyncCommandGenerator()
self.mibViewController = self.__asyncCmdGen.getMibViewController(self.snmpEngine)
def __del__(self):
self.__asyncCmdGen.uncfgCmdGen(self.snmpEngine)
def cfgCmdGen(self, authData, transportTarget):
return self.__asyncCmdGen.cfgCmdGen(
self.snmpEngine, authData, transportTarget
)
def uncfgCmdGen(self, authData=None):
return self.__asyncCmdGen.uncfgCmdGen(
self.snmpEngine, authData
)
# compatibility stub
def makeReadVarBinds(self, varNames):
return self.makeVarBinds(
[ (x, univ.Null('')) for x in varNames ]
)
def makeVarBinds(self, varBinds):
return self.__asyncCmdGen.makeVarBinds(
self.snmpEngine, varBinds
)
def unmakeVarBinds(self, varBinds, lookupNames, lookupValues):
return self.__asyncCmdGen.unmakeVarBinds(
self.snmpEngine, varBinds, lookupNames or lookupValues
)
def getCmd(self, authData, transportTarget, varNames, cbInfo,
lookupNames=False, lookupValues=False,
contextEngineId=None, contextName=null):
def __cbFun(snmpEngine, sendRequestHandle,
errorIndication, errorStatus, errorIndex,
varBindTable, cbCtx):
cbFun, cbCtx = cbCtx
cbFun(sendRequestHandle,
errorIndication, errorStatus, errorIndex,
varBindTable, cbCtx)
# for backward compatibility
if contextName is null and authData.contextName:
contextName = authData.contextName
cbInfo = __cbFun, cbInfo
return self.__asyncCmdGen.getCmd(
self.snmpEngine,
authData, transportTarget,
ContextData(contextEngineId, contextName),
[(x, self._null) for x in varNames],
cbInfo,
lookupNames or lookupValues
)
asyncGetCmd = getCmd
def setCmd(self, authData, transportTarget, varBinds, cbInfo,
lookupNames=False, lookupValues=False,
contextEngineId=None, contextName=null):
def __cbFun(snmpEngine, sendRequestHandle,
errorIndication, errorStatus, errorIndex,
varBindTable, cbCtx):
cbFun, cbCtx = cbCtx
cbFun(sendRequestHandle,
errorIndication, errorStatus, errorIndex,
varBindTable, cbCtx)
# for backward compatibility
if contextName is null and authData.contextName:
contextName = authData.contextName
cbInfo = __cbFun, cbInfo
return self.__asyncCmdGen.setCmd(
self.snmpEngine,
authData, transportTarget,
ContextData(contextEngineId, contextName), varBinds, cbInfo,
lookupNames or lookupValues
)
asyncSetCmd = setCmd
def nextCmd(self, authData, transportTarget, varNames, cbInfo,
lookupNames=False, lookupValues=False,
contextEngineId=None, contextName=null):
def __cbFun(snmpEngine, sendRequestHandle,
errorIndication, errorStatus, errorIndex,
varBindTable, cbCtx):
cbFun, cbCtx = cbCtx
return cbFun(sendRequestHandle,
errorIndication, errorStatus, errorIndex,
varBindTable, cbCtx)
# for backward compatibility
if contextName is null and authData.contextName:
contextName = authData.contextName
cbInfo = __cbFun, cbInfo
return self.__asyncCmdGen.nextCmd(
self.snmpEngine,
authData, transportTarget,
ContextData(contextEngineId, contextName),
[(x, self._null) for x in varNames],
cbInfo,
lookupNames or lookupValues
)
asyncNextCmd = nextCmd
def bulkCmd(self, authData, transportTarget,
nonRepeaters, maxRepetitions, varNames, cbInfo,
lookupNames=False, lookupValues=False,
contextEngineId=None, contextName=null):
def __cbFun(snmpEngine, sendRequestHandle,
errorIndication, errorStatus, errorIndex,
varBindTable, cbCtx):
cbFun, cbCtx = cbCtx
return cbFun(sendRequestHandle,
errorIndication, errorStatus, errorIndex,
varBindTable, cbCtx)
# for backward compatibility
if contextName is null and authData.contextName:
contextName = authData.contextName
cbInfo = __cbFun, cbInfo
return self.__asyncCmdGen.bulkCmd(
self.snmpEngine,
authData, transportTarget,
ContextData(contextEngineId, contextName),
nonRepeaters, maxRepetitions,
[(x, self._null) for x in varNames],
cbInfo,
lookupNames or lookupValues
)
asyncBulkCmd = bulkCmd
class CommandGenerator:
def __init__(self, snmpEngine=None, asynCmdGen=None):
# compatibility attributes
self.snmpEngine = snmpEngine or SnmpEngine()
self.mibViewController = AsyncCommandGenerator().getMibViewController(self.snmpEngine)
def getCmd(self, authData, transportTarget, *varNames, **kwargs):
for x in getCmd(self.snmpEngine, authData, transportTarget,
ContextData(kwargs.get('contextEngineId'),
kwargs.get('contextName', null)),
*[ (x, univ.Null()) for x in varNames ],
**kwargs):
return x
def setCmd(self, authData, transportTarget, *varBinds, **kwargs):
for x in setCmd(self.snmpEngine, authData, transportTarget,
ContextData(kwargs.get('contextEngineId'),
kwargs.get('contextName', null)),
*varBinds,
**kwargs):
return x
def nextCmd(self, authData, transportTarget, *varNames, **kwargs):
varBindTable = []
for errorIndication, \
errorStatus, errorIndex, \
varBinds in nextCmd(self.snmpEngine, authData, transportTarget,
ContextData(kwargs.get('contextEngineId'),
kwargs.get('contextName', null)),
*[ (x, univ.Null()) for x in varNames ],
**kwargs):
if errorIndication or errorStatus:
return errorIndication, errorStatus, errorIndex, varBinds
varBindTable.append(varBinds)
return errorIndication, errorStatus, errorIndex, varBindTable
def bulkCmd(self, authData, transportTarget,
nonRepeaters, maxRepetitions, *varNames, **kwargs):
varBindTable = []
for errorIndication, \
errorStatus, errorIndex, \
varBinds in bulkCmd(self.snmpEngine, authData, transportTarget,
ContextData(kwargs.get('contextEngineId'),
kwargs.get('contextName', null)),
nonRepeaters, maxRepetitions,
*[ (x, univ.Null()) for x in varNames ],
**kwargs):
if errorIndication or errorStatus:
return errorIndication, errorStatus, errorIndex, varBinds
varBindTable.append(varBinds)
return errorIndication, errorStatus, errorIndex, varBindTable
# circular module import dependency
if version_info[:2] < (2, 6):
from pysnmp.entity.rfc3413.oneliner.sync.compat.cmdgen import *
else:
from pysnmp.entity.rfc3413.oneliner.sync.cmdgen import *
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