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"""
Walk Agent MIB (SNMPv1)
+++++++++++++++++++++++
Perform SNMP GETNEXT operation with the following options:
* with SNMPv1, community 'public'
* over IPv4/UDP
* to an Agent at demo.pysnmp.com:161
* for OID in tuple form
This script performs similar to the following Net-SNMP command:
| $ snmpwalk -v1 -c public -ObentU demo.pysnmp.com 1.3.6
""" #
from pysnmp.carrier.asyncio.dispatch import AsyncioDispatcher
from pysnmp.carrier.asyncio.dgram import udp
from pyasn1.codec.ber import encoder, decoder
from pysnmp.proto import api
# Protocol version to use
pMod = api.PROTOCOL_MODULES[api.SNMP_VERSION_1]
# pMod = api.PROTOCOL_MODULES[api.SNMP_VERSION_2C]
# SNMP table header
headVars = [pMod.ObjectIdentifier((1, 3, 6))]
# Build PDU
reqPDU = pMod.GetNextRequestPDU()
pMod.apiPDU.set_defaults(reqPDU)
pMod.apiPDU.set_varbinds(reqPDU, [(x, pMod.null) for x in headVars])
# Build message
reqMsg = pMod.Message()
pMod.apiMessage.set_defaults(reqMsg)
pMod.apiMessage.set_community(reqMsg, "public")
pMod.apiMessage.set_pdu(reqMsg, reqPDU)
# noinspection PyUnusedLocal
def cbRecvFun(
transportDispatcher,
transportDomain,
transportAddress,
wholeMsg,
reqPDU=reqPDU,
headVars=headVars,
):
while wholeMsg:
rspMsg, wholeMsg = decoder.decode(wholeMsg, asn1Spec=pMod.Message())
rspPDU = pMod.apiMessage.get_pdu(rspMsg)
# Match response to request
if pMod.apiPDU.get_request_id(reqPDU) == pMod.apiPDU.get_request_id(rspPDU):
# Check for SNMP errors reported
errorStatus = pMod.apiPDU.get_error_status(rspPDU)
if errorStatus and errorStatus != 2:
raise Exception(errorStatus)
# Format var-binds table
varBindTable = pMod.apiPDU.get_varbind_table(reqPDU, rspPDU)
# Report SNMP table
for tableRow in varBindTable:
for name, val in tableRow:
print(
"from: {}, {} = {}".format(
transportAddress, name.prettyPrint(), val.prettyPrint()
)
)
# Stop on EOM
for oid, val in varBindTable[-1]:
if not isinstance(val, pMod.Null):
break
else:
transportDispatcher.job_finished(1)
continue
# Generate request for next row
pMod.apiPDU.set_varbinds(
reqPDU, [(x, pMod.null) for x, y in varBindTable[-1]]
)
pMod.apiPDU.set_request_id(reqPDU, pMod.get_next_request_id())
transportDispatcher.send_message(
encoder.encode(reqMsg), transportDomain, transportAddress
)
return wholeMsg
transportDispatcher = AsyncioDispatcher()
transportDispatcher.register_recv_callback(cbRecvFun)
transportDispatcher.register_transport(
udp.DOMAIN_NAME, udp.UdpAsyncioTransport().open_client_mode()
)
transportDispatcher.send_message(
encoder.encode(reqMsg), udp.DOMAIN_NAME, ("demo.pysnmp.com", 161)
)
transportDispatcher.job_started(1)
transportDispatcher.run_dispatcher(3)
transportDispatcher.close_dispatcher()
|
