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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.auth import *
from pysnmp.hlapi.v1arch.asyncore import *
from pysnmp.hlapi.varbinds import *
from pysnmp.smi.rfc1902 import *
from pysnmp.proto import api
from pysnmp.proto.proxy import rfc2576
from pysnmp import error
__all__ = ['sendNotification']
VB_PROCESSOR = NotificationOriginatorVarBinds()
def sendNotification(snmpDispatcher, authData, transportTarget,
notifyType, *varBinds, **options):
"""Send SNMP notification.
Based on passed parameters, prepares SNMP TRAP or INFORM
notification (:RFC:`1905#section-4.2.6`) and schedules its
transmission by I/O framework at a later point of time.
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`.
* `cbFun` (callable) - user-supplied callable that is invoked
to pass SNMP response data or error to user at a later point
of time. Default is `None`.
* `cbCtx` (object) - user-supplied object passing additional
parameters to/from `cbFun`. Default is `None`.
Note
----
The `SnmpDispatcher` object may be expensive to create, therefore it is
advised to maintain it for the lifecycle of the application/thread for
as long as possible.
Returns
-------
sendRequestHandle: int
Unique request identifier. Can be used for matching received
responses with ongoing *INFORM* requests. Returns `None` for
*TRAP* notifications.
Raises
------
PySnmpError
Or its derivative indicating that an error occurred while
performing SNMP operation.
Examples
--------
>>> from pysnmp.hlapi.v1arch.asyncore import *
>>>
>>> snmpDispatcher = SnmpDispatcher()
>>>
>>> sendNotification(
>>> snmpDispatcher,
>>> CommunityData('public'),
>>> UdpTransportTarget(('demo.snmplabs.com', 162)),
>>> 'trap',
>>> NotificationType(ObjectIdentity('SNMPv2-MIB', 'coldStart')),
>>> lookupMib=True
>>> )
>>> snmpDispatcher.transportDispatcher.runDispatcher()
"""
def _cbFun(snmpDispatcher, stateHandle, errorIndication, rspPdu, _cbCtx):
if not cbFun:
return
if errorIndication:
cbFun(errorIndication, pMod.Integer(0), pMod.Integer(0), None,
cbCtx=cbCtx, snmpDispatcher=snmpDispatcher, stateHandle=stateHandle)
return
errorStatus = pMod.apiTrapPDU.getErrorStatus(rspPdu)
errorIndex = pMod.apiTrapPDU.getErrorIndex(rspPdu)
varBinds = pMod.apiTrapPDU.getVarBinds(rspPdu)
if lookupMib:
varBinds = VB_PROCESSOR.unmakeVarBinds(snmpDispatcher.cache, varBinds)
nextStateHandle = pMod.getNextRequestID()
nextVarBinds = cbFun(errorIndication, errorStatus, errorIndex, varBinds,
cbCtx=cbCtx,
snmpDispatcher=snmpDispatcher,
stateHandle=stateHandle,
nextStateHandle=nextStateHandle)
if not nextVarBinds:
return
pMod.apiTrapPDU.setRequestID(reqPdu, nextStateHandle)
pMod.apiTrapPDU.setVarBinds(reqPdu, nextVarBinds)
return snmpDispatcher.sendPdu(authData, transportTarget, reqPdu, cbFun=_cbFun)
lookupMib, cbFun, cbCtx = [options.get(x) for x in ('lookupMib', 'cbFun', 'cbCtx')]
if lookupMib:
varBinds = VB_PROCESSOR.makeVarBinds(snmpDispatcher.cache, varBinds)
# # make sure required PDU payload is in place
# completeVarBinds = []
#
# # ensure sysUpTime
# if len(varBinds) < 1 or varBinds[0][0] != pMod.apiTrapPDU.sysUpTime:
# varBinds.insert(0, (ObjectIdentifier(pMod.apiTrapPDU.sysUpTime), pMod.Integer(0)))
#
# # ensure sysUpTime
# if len(varBinds) < 1 or varBinds[0][0] != pMod.apiTrapPDU.sysUpTime:
# varBinds.insert(0, (ObjectIdentifier(pMod.apiTrapPDU.sysUpTime), pMod.Integer(0)))
#
# # ensure snmpTrapOID
# if len(varBinds) < 2 or varBinds[1][0] != pMod.apiTrapPDU.snmpTrapOID:
# varBinds.insert(0, (ObjectIdentifier(pMod.apiTrapPDU.sysUpTime), pMod.Integer(0)))
# input PDU is always v2c
pMod = api.PROTOCOL_MODULES[api.SNMP_VERSION_2C]
if notifyType == 'trap':
reqPdu = pMod.TrapPDU()
else:
reqPdu = pMod.InformRequestPDU()
pMod.apiTrapPDU.setDefaults(reqPdu)
pMod.apiTrapPDU.setVarBinds(reqPdu, varBinds)
if authData.mpModel == 0:
reqPdu = rfc2576.v2ToV1(reqPdu)
return snmpDispatcher.sendPdu(authData, transportTarget, reqPdu, cbFun=_cbFun)
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