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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
#
from pysnmp.hlapi.v1arch.asyncore import ntforg
from pysnmp.hlapi.varbinds import *
__all__ = ['sendNotification']
def sendNotification(snmpDispatcher, authData, transportTarget,
notifyType, *varBinds, **options):
"""Creates a generator to send one or more SNMP notifications.
On each iteration, new SNMP TRAP or INFORM notification is send
(:RFC:`1905#section-4,2,6`). The iterator blocks waiting for
INFORM acknowledgement to arrive or error to occur.
Parameters
----------
snmpDispatcher: :py:class:`~pysnmp.hlapi.v1arch.asyncore.SnmpDispatcher`
Class instance representing asyncore-based asynchronous event loop and
associated state information.
authData: :py:class:`~pysnmp.hlapi.CommunityData` or :py:class:`~pysnmp.hlapi.UsmUserData`
Class instance representing SNMP credentials.
transportTarget: :py:class:`~pysnmp.hlapi.asyncore.UdpTransportTarget` or
:py:class:`~pysnmp.hlapi.asyncore.Udp6TransportTarget`
Class instance representing transport type along with SNMP peer address.
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 `False`.
Yields
------
errorIndication: str
True value indicates local SNMP error.
errorStatus: str
True value indicates SNMP PDU error reported by remote.
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.
Notes
-----
The `sendNotification` generator will be exhausted immediately unless
an instance of :py:class:`~pysnmp.smi.rfc1902.NotificationType` class
or a sequence of :py:class:`~pysnmp.smi.rfc1902.ObjectType` `varBinds`
are send back into running generator (supported since Python 2.6).
Examples
--------
>>> from pysnmp.hlapi.v1arch import *
>>>
>>> g = sendNotification(SnmpDispatcher(),
>>> CommunityData('public'),
>>> UdpTransportTarget(('demo.snmplabs.com', 162)),
>>> 'trap',
>>> NotificationType(ObjectIdentity('IF-MIB', 'linkDown')))
>>> next(g)
(None, 0, 0, [])
"""
def cbFun(*args, **kwargs):
response[:] = args
options['cbFun'] = cbFun
errorIndication, errorStatus, errorIndex = None, 0, 0
response = [None, 0, 0, []]
while True:
if varBinds:
ntforg.sendNotification(snmpDispatcher, authData, transportTarget,
notifyType, *varBinds, **options)
snmpDispatcher.transportDispatcher.runDispatcher()
errorIndication, errorStatus, errorIndex, varBinds = response
varBinds = (yield errorIndication, errorStatus, errorIndex, varBinds)
if not varBinds:
break
|
