157 lines
5.1 KiB
Python
157 lines
5.1 KiB
Python
#
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# This file is part of pysnmp software.
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#
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# Copyright (c) 2005-2017, Ilya Etingof <etingof@gmail.com>
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# License: http://pysnmp.sf.net/license.html
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#
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# Copyright (C) 2014, Zebra Technologies
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# Authors: Matt Hooks <me@matthooks.com>
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# Zachary Lorusso <zlorusso@gmail.com>
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#
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from pysnmp.smi.rfc1902 import *
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from pysnmp.hlapi.auth import *
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from pysnmp.hlapi.context import *
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from pysnmp.hlapi.lcd import *
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from pysnmp.hlapi.varbinds import *
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from pysnmp.hlapi.asyncio.transport import *
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from pysnmp.entity.rfc3413 import ntforg
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try:
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import asyncio
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except ImportError:
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import trollius as asyncio
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__all__ = ['sendNotification']
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vbProcessor = NotificationOriginatorVarBinds()
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lcd = NotificationOriginatorLcdConfigurator()
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@asyncio.coroutine
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def sendNotification(snmpEngine, authData, transportTarget, contextData,
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notifyType, varBinds, **options):
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"""Creates a generator to send SNMP notification.
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When itereator gets advanced by :py:mod:`asyncio` main loop,
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SNMP TRAP or INFORM notification is send (:RFC:`1905#section-4.2.6`).
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The iterator yields :py:class:`asyncio.Future` which gets done whenever
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response arrives or error occurs.
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Parameters
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----------
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snmpEngine : :py:class:`~pysnmp.hlapi.SnmpEngine`
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Class instance representing SNMP engine.
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authData : :py:class:`~pysnmp.hlapi.CommunityData` or :py:class:`~pysnmp.hlapi.UsmUserData`
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Class instance representing SNMP credentials.
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transportTarget : :py:class:`~pysnmp.hlapi.asyncio.UdpTransportTarget` or :py:class:`~pysnmp.hlapi.asyncio.Udp6TransportTarget`
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Class instance representing transport type along with SNMP peer address.
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contextData : :py:class:`~pysnmp.hlapi.ContextData`
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Class instance representing SNMP ContextEngineId and ContextName values.
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notifyType : str
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Indicates type of notification to be sent. Recognized literal
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values are *trap* or *inform*.
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varBinds: tuple
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Single :py:class:`~pysnmp.smi.rfc1902.NotificationType` class instance
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representing a minimum sequence of MIB variables required for
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particular notification type.
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Alternatively, a sequence of :py:class:`~pysnmp.smi.rfc1902.ObjectType`
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objects could be passed instead. In the latter case it is up to
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the user to ensure proper Notification PDU contents.
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Other Parameters
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----------------
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\*\*options :
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Request options:
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* `lookupMib` - load MIB and resolve response MIB variables at
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the cost of slightly reduced performance. Default is `True`.
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Yields
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------
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errorIndication : str
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True value indicates SNMP engine error.
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errorStatus : str
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True value indicates SNMP PDU error.
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errorIndex : int
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Non-zero value refers to `varBinds[errorIndex-1]`
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varBinds : tuple
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A sequence of :py:class:`~pysnmp.smi.rfc1902.ObjectType` class
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instances representing MIB variables returned in SNMP response.
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Raises
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------
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PySnmpError
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Or its derivative indicating that an error occurred while
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performing SNMP operation.
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Notes
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-----
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The `sendNotification` generator will be exhausted immidiately unless
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an instance of :py:class:`~pysnmp.smi.rfc1902.NotificationType` class
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or a sequence of :py:class:`~pysnmp.smi.rfc1902.ObjectType` `varBinds`
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are send back into running generator (supported since Python 2.6).
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Examples
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--------
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>>> import asyncio
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>>> from pysnmp.hlapi.asyncio import *
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>>>
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>>> @asyncio.coroutine
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... def run():
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... errorIndication, errorStatus, errorIndex, varBinds = yield from sendNotification(
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... SnmpEngine(),
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... CommunityData('public'),
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... UdpTransportTarget(('demo.snmplabs.com', 162)),
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... ContextData(),
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... 'trap',
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... NotificationType(ObjectIdentity('IF-MIB', 'linkDown')))
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... print(errorIndication, errorStatus, errorIndex, varBinds)
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...
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>>> asyncio.get_event_loop().run_until_complete(run())
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(None, 0, 0, [])
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>>>
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"""
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def __cbFun(snmpEngine, sendRequestHandle,
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errorIndication, errorStatus, errorIndex,
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varBinds, cbCtx):
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lookupMib, future = cbCtx
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if future.cancelled():
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return
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future.set_result(
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(errorIndication, errorStatus, errorIndex, vbProcessor.unmakeVarBinds(snmpEngine, varBinds, lookupMib))
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)
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notifyName = lcd.configure(
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snmpEngine, authData, transportTarget, notifyType
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)
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future = asyncio.Future()
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ntforg.NotificationOriginator().sendVarBinds(
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snmpEngine,
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notifyName,
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contextData.contextEngineId,
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contextData.contextName,
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vbProcessor.makeVarBinds(snmpEngine, varBinds),
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__cbFun,
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(options.get('lookupMib', True), future)
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)
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if notifyType == 'trap':
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def __trapFun(future):
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if future.cancelled():
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return
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future.set_result((None, 0, 0, []))
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loop = asyncio.get_event_loop()
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loop.call_soon(__trapFun, future)
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return future
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