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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.import_symbols("SNMPv2-SMI", "MibScalarInstance")
# Managed object specification
(sysLocation,) = mibBuilder.import_symbols("SNMPv2-MIB", "sysLocation")
# Custom Managed Object
class MySysLocationInstance(MibScalarInstance):
# noinspection PyUnusedLocal
def readGet(self, varBind, **context):
# Just return a custom value
return varBind[0], self.syntax.clone("The Leaky Cauldron")
sysLocationInstance = MySysLocationInstance(sysLocation.name, (0,), sysLocation.syntax)
# Register Managed Object with a MIB tree
mibBuilder.export_symbols(
# '__' 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)
print("Remote manager read access to MIB instrumentation (table walk)")
varBinds = [((), None)]
while True:
varBinds = mibInstrum.read_next_variables(*varBinds)
oid, val = varBinds[0]
if exval.endOfMib.isSameTypeWith(val):
break
print(oid, val.prettyPrint())
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