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"""
Bulk walk Agent MIB (SNMPv2c)
+++++++++++++++++++++++++++++
Perform SNMP GETBULK operation with the following options:
* with SNMPv2c, community 'public'
* over IPv4/UDP
* to an Agent at demo.pysnmp.com:161
* for OID in tuple form
* with non-repeaters=0 and max-repeaters=25
This script performs similar to the following Net-SNMP command:
| $ snmpbulkwalk -v2c -c public -ObentU -Cn0 -Cr25 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.api import v2c
# SNMP table header
headVars = [v2c.ObjectIdentifier((1, 3, 6))]
# Build PDU
reqPDU = v2c.GetBulkRequestPDU()
v2c.apiBulkPDU.set_defaults(reqPDU)
v2c.apiBulkPDU.set_non_repeaters(reqPDU, 0)
v2c.apiBulkPDU.set_max_repetitions(reqPDU, 25)
v2c.apiBulkPDU.set_varbinds(reqPDU, [(x, v2c.null) for x in headVars])
# Build message
reqMsg = v2c.Message()
v2c.apiMessage.set_defaults(reqMsg)
v2c.apiMessage.set_community(reqMsg, "public")
v2c.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=v2c.Message())
rspPDU = v2c.apiMessage.get_pdu(rspMsg)
# Match response to request
if v2c.apiBulkPDU.get_request_id(reqPDU) == v2c.apiBulkPDU.get_request_id(
rspPDU
):
# Format var-binds table
varBindTable = v2c.apiBulkPDU.get_varbind_table(reqPDU, rspPDU)
# Check for SNMP errors reported
errorStatus = v2c.apiBulkPDU.get_error_status(rspPDU)
if errorStatus and errorStatus != 2:
errorIndex = v2c.apiBulkPDU.get_error_index(rspPDU)
print(
"{} at {}".format(
errorStatus.prettyPrint(),
errorIndex and varBindTable[int(errorIndex) - 1] or "?",
)
)
transportDispatcher.job_finished(1)
break
# 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, v2c.Null):
break
else:
transportDispatcher.job_finished(1)
continue
# Generate request for next row
v2c.apiBulkPDU.set_varbinds(
reqPDU, [(x, v2c.null) for x, y in varBindTable[-1]]
)
v2c.apiBulkPDU.set_request_id(reqPDU, v2c.getNextRequestID())
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)
# Dispatcher will finish as job#1 counter reaches zero
transportDispatcher.run_dispatcher(3)
transportDispatcher.close_dispatcher()
|
