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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
#
# Copyright (C) 2014, Zebra Technologies
# Authors: Matt Hooks <me@matthooks.com>
# Zachary Lorusso <zlorusso@gmail.com>
#
try:
import asyncio
except ImportError:
import trollius as asyncio
from pysnmp.hlapi.v3arch.auth import *
from pysnmp.hlapi.v3arch.context import *
from pysnmp.hlapi.v3arch.lcd import *
from pysnmp.hlapi.varbinds import *
from pysnmp.hlapi.v3arch.asyncio.transport import *
from pysnmp.entity.rfc3413 import ntforg
from pysnmp.smi.rfc1902 import *
__all__ = ['sendNotification']
VB_PROCESSOR = NotificationOriginatorVarBinds()
LCD = NotificationOriginatorLcdConfigurator()
@asyncio.coroutine
def sendNotification(snmpEngine, authData, transportTarget, contextData,
notifyType, *varBinds, **options):
"""Creates a generator to send SNMP notification.
When iterator gets advanced by :py:mod:`asyncio` main loop,
SNMP TRAP or INFORM notification is send (:RFC:`1905#section-4.2.6`).
The iterator yields :py:class:`asyncio.Future` which gets done whenever
response arrives or error occurs.
Parameters
----------
snmpEngine : :py:class:`~pysnmp.hlapi.SnmpEngine`
Class instance representing SNMP engine.
authData : :py:class:`~pysnmp.hlapi.CommunityData` or :py:class:`~pysnmp.hlapi.UsmUserData`
Class instance representing SNMP credentials.
transportTarget : :py:class:`~pysnmp.hlapi.asyncio.UdpTransportTarget` or :py:class:`~pysnmp.hlapi.asyncio.Udp6TransportTarget`
Class instance representing transport type along with SNMP peer address.
contextData : :py:class:`~pysnmp.hlapi.ContextData`
Class instance representing SNMP ContextEngineId and ContextName values.
notifyType : str
Indicates type of notification to be sent. Recognized literal
values are *trap* or *inform*.
\*varBinds: :class:`tuple` of OID-value pairs or :py:class:`~pysnmp.smi.rfc1902.ObjectType` or :py:class:`~pysnmp.smi.rfc1902.NotificationType`
One or more objects representing MIB variables to place
into SNMP notification. It could be tuples of OID-values
or :py:class:`~pysnmp.smi.rfc1902.ObjectType` class instances
of :py:class:`~pysnmp.smi.rfc1902.NotificationType` objects.
SNMP Notification PDU places rigid requirement on the ordering of
the variable-bindings.
Mandatory variable-bindings:
0. SNMPv2-MIB::sysUpTime.0 = <agent uptime>
1. SNMPv2-SMI::snmpTrapOID.0 = {SNMPv2-MIB::coldStart, ...}
Optional variable-bindings (applicable to SNMP v1 TRAP):
2. SNMP-COMMUNITY-MIB::snmpTrapAddress.0 = <agent-IP>
3. SNMP-COMMUNITY-MIB::snmpTrapCommunity.0 = <snmp-community-name>
4. SNMP-COMMUNITY-MIB::snmpTrapEnterprise.0 = <enterprise-OID>
Informational variable-bindings:
* SNMPv2-SMI::NOTIFICATION-TYPE
* SNMPv2-SMI::OBJECT-TYPE
Other Parameters
----------------
\*\*options :
Request options:
* `lookupMib` - load MIB and resolve response MIB variables at
the cost of slightly reduced performance. Default is `True`.
Yields
------
errorIndication : str
True value indicates SNMP engine error.
errorStatus : str
True 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.
Raises
------
PySnmpError
Or its derivative indicating that an error occurred while
performing SNMP operation.
Examples
--------
>>> import asyncio
>>> from pysnmp.hlapi.asyncio import *
>>>
>>> @asyncio.coroutine
... def run():
... errorIndication, errorStatus, errorIndex, varBinds = yield from sendNotification(
... SnmpEngine(),
... CommunityData('public'),
... UdpTransportTarget(('demo.snmplabs.com', 162)),
... ContextData(),
... 'trap',
... NotificationType(ObjectIdentity('IF-MIB', 'linkDown')))
... print(errorIndication, errorStatus, errorIndex, varBinds)
...
>>> asyncio.get_event_loop().run_until_complete(run())
(None, 0, 0, [])
>>>
"""
def __cbFun(snmpEngine, sendRequestHandle,
errorIndication, errorStatus, errorIndex,
varBinds, cbCtx):
lookupMib, future = cbCtx
if future.cancelled():
return
try:
varBindsUnmade = VB_PROCESSOR.unmakeVarBinds(snmpEngine.cache, varBinds,
lookupMib)
except Exception as e:
future.set_exception(e)
else:
future.set_result(
(errorIndication, errorStatus, errorIndex, varBindsUnmade)
)
notifyName = LCD.configure(
snmpEngine, authData, transportTarget, notifyType,
contextData.contextName)
future = asyncio.Future()
ntforg.NotificationOriginator().sendVarBinds(
snmpEngine,
notifyName,
contextData.contextEngineId,
contextData.contextName,
VB_PROCESSOR.makeVarBinds(snmpEngine.cache, varBinds),
__cbFun,
(options.get('lookupMib', True), future)
)
if notifyType == 'trap':
def __trapFun(future):
if future.cancelled():
return
future.set_result((None, 0, 0, []))
loop = asyncio.get_event_loop()
loop.call_soon(__trapFun, future)
return future
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