86 lines
2.4 KiB
Python
86 lines
2.4 KiB
Python
"""
|
|
Implementing scalar MIB objects
|
|
+++++++++++++++++++++++++++++++
|
|
|
|
Listen and respond to SNMP GET/SET/GETNEXT/GETBULK queries with
|
|
the following options:
|
|
|
|
* SNMPv2c
|
|
* with SNMP community "public"
|
|
* serving custom Managed Object Instance defined within this script
|
|
* allow read access only to the subtree where the custom MIB object resides
|
|
* over IPv4/UDP, listening at 127.0.0.1:161
|
|
|
|
The following Net-SNMP commands will walk this Agent:
|
|
|
|
| $ snmpwalk -v2c -c public 127.0.0.1 .1.3.6
|
|
|
|
"""#
|
|
import sys
|
|
from pysnmp.entity import engine, config
|
|
from pysnmp.entity.rfc3413 import cmdrsp, context
|
|
from pysnmp.carrier.asyncore.dgram import udp
|
|
from pysnmp.proto.api import v2c
|
|
|
|
# Create SNMP engine
|
|
snmpEngine = engine.SnmpEngine()
|
|
|
|
# Transport setup
|
|
|
|
# UDP over IPv4
|
|
config.addTransport(
|
|
snmpEngine,
|
|
udp.domainName,
|
|
udp.UdpTransport().openServerMode(('127.0.0.1', 161))
|
|
)
|
|
|
|
# SNMPv2c setup
|
|
|
|
# SecurityName <-> CommunityName mapping.
|
|
config.addV1System(snmpEngine, 'my-area', 'public')
|
|
|
|
# Allow read MIB access for this user / securityModels at VACM
|
|
config.addVacmUser(snmpEngine, 2, 'my-area', 'noAuthNoPriv', (1, 3, 6, 5))
|
|
|
|
# Create an SNMP context
|
|
snmpContext = context.SnmpContext(snmpEngine)
|
|
|
|
# --- create custom Managed Object Instance ---
|
|
|
|
mibBuilder = snmpContext.getMibInstrum().getMibBuilder()
|
|
|
|
MibScalar, MibScalarInstance = mibBuilder.importSymbols(
|
|
'SNMPv2-SMI', 'MibScalar', 'MibScalarInstance'
|
|
)
|
|
|
|
|
|
class MyStaticMibScalarInstance(MibScalarInstance):
|
|
# noinspection PyUnusedLocal,PyUnusedLocal
|
|
def getValue(self, name, idx, **context):
|
|
return self.getSyntax().clone(
|
|
'Python %s running on a %s platform' % (sys.version, sys.platform)
|
|
)
|
|
|
|
|
|
mibBuilder.exportSymbols(
|
|
'__MY_MIB', MibScalar((1, 3, 6, 5, 1), v2c.OctetString()),
|
|
MyStaticMibScalarInstance((1, 3, 6, 5, 1), (0,), v2c.OctetString())
|
|
)
|
|
|
|
# --- end of Managed Object Instance initialization ----
|
|
|
|
# Register SNMP Applications at the SNMP engine for particular SNMP context
|
|
cmdrsp.GetCommandResponder(snmpEngine, snmpContext)
|
|
cmdrsp.NextCommandResponder(snmpEngine, snmpContext)
|
|
cmdrsp.BulkCommandResponder(snmpEngine, snmpContext)
|
|
|
|
# Register an imaginary never-ending job to keep I/O dispatcher running forever
|
|
snmpEngine.transportDispatcher.jobStarted(1)
|
|
|
|
# Run I/O dispatcher which would receive queries and send responses
|
|
try:
|
|
snmpEngine.transportDispatcher.runDispatcher()
|
|
except:
|
|
snmpEngine.transportDispatcher.closeDispatcher()
|
|
raise
|