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"""
Implementing MIB objects
++++++++++++++++++++++++
This script explains how SNMP Agent application could model
real-world data as Managed Objects defined in MIB.
"""#
from pysnmp.smi import builder
# MIB Builder is normally pre-created by SNMP engine
mibBuilder = builder.MibBuilder()
#
# This may be done in a stand-alone file and then loaded up
# by SNMP Agent
#
# A base class for a custom Managed Object
MibScalarInstance, = mibBuilder.importSymbols(
'SNMPv2-SMI', 'MibScalarInstance'
)
# Managed object specification
sysLocation, = mibBuilder.importSymbols('SNMPv2-MIB', 'sysLocation')
# Custom Managed Object
class MySysLocationInstance(MibScalarInstance):
# noinspection PyUnusedLocal
def readGet(self, varBind, **context):
cbFun = context['cbFun']
# Just return a custom value
cbFun((varBind[0], self.syntax.clone('The Leaky Cauldron')), **context)
sysLocationInstance = MySysLocationInstance(
sysLocation.name, (0,), sysLocation.syntax
)
# Register Managed Object with a MIB tree
mibBuilder.exportSymbols(
# '__' prefixed MIB modules take precedence on indexing
'__MY-LOCATION-MIB', sysLocationInstance=sysLocationInstance
)
if __name__ == '__main__':
#
# This is what is done internally by Agent.
#
from pysnmp.smi import instrum, exval
mibInstrum = instrum.MibInstrumController(mibBuilder)
def cbFun(varBinds, **context):
for oid, val in varBinds:
if exval.endOfMib.isSameTypeWith(val):
context['app']['stop'] = True
print('%s = %s' % ('.'.join([str(x) for x in oid]), not val.isValue and 'N/A' or val.prettyPrint()))
context['app']['varBinds'] = varBinds
app_context = {
'varBinds': [((1, 3, 6), None)],
'stop': False
}
print('Remote manager read access to MIB instrumentation (table walk)')
while not app_context['stop']:
mibInstrum.readNextMibObjects(*app_context['varBinds'], cbFun=cbFun, app=app_context)
print('done')
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