Modifying variables#
SET string and integer scalars (SNMPv2c)#
Perform SNMP SET operation with the following options:
with SNMPv2c, community ‘public’
over IPv4/UDP
to an Agent at demo.pysnmp.com:161
for OIDs in string form and values in form of pyasn1 objects
This script performs similar to the following Net-SNMP command:
$ snmpset -v2c -c public -ObentU demo.pysnmp.com 1.3.6.1.2.1.1.9.1.3.1 s ‘New description’ 1.3.6.1.2.1.1.9.1.4.1 t 12
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
from time import time
# Protocol version to use
# pMod = api.protoModules[api.protoVersion1]
pMod = api.PROTOCOL_MODULES[api.SNMP_VERSION_1]
# Build PDU
reqPDU = pMod.SetRequestPDU()
pMod.apiPDU.setDefaults(reqPDU)
pMod.apiPDU.setVarBinds(
reqPDU,
# A list of Var-Binds to SET
(
("1.3.6.1.2.1.1.9.1.3.1", pMod.OctetString("New system description")),
("1.3.6.1.2.1.1.9.1.4.1", pMod.TimeTicks(12)),
),
)
# Build message
reqMsg = pMod.Message()
pMod.apiMessage.setDefaults(reqMsg)
pMod.apiMessage.setCommunity(reqMsg, "public")
pMod.apiMessage.setPDU(reqMsg, reqPDU)
# noinspection PyUnusedLocal,PyUnusedLocal
def cbRecvFun(
transportDispatcher, transportDomain, transportAddress, wholeMsg, reqPDU=reqPDU
):
while wholeMsg:
rspMsg, wholeMsg = decoder.decode(wholeMsg, asn1Spec=pMod.Message())
rspPDU = pMod.apiMessage.getPDU(rspMsg)
# Match response to request
if pMod.apiPDU.getRequestID(reqPDU) == pMod.apiPDU.getRequestID(rspPDU):
# Check for SNMP errors reported
errorStatus = pMod.apiPDU.getErrorStatus(rspPDU)
if errorStatus:
print(errorStatus.prettyPrint())
else:
for oid, val in pMod.apiPDU.getVarBinds(rspPDU):
print(f"{oid.prettyPrint()} = {val.prettyPrint()}")
transportDispatcher.jobFinished(1)
return wholeMsg
transportDispatcher = AsyncioDispatcher()
transportDispatcher.registerRecvCbFun(cbRecvFun)
# UDP/IPv4
transportDispatcher.registerTransport(
udp.DOMAIN_NAME, udp.UdpAsyncioTransport().openClientMode()
)
# Pass message to dispatcher
transportDispatcher.sendMessage(
encoder.encode(reqMsg), udp.DOMAIN_NAME, ("demo.pysnmp.com", 161)
)
transportDispatcher.jobStarted(1)
# Dispatcher will finish as job#1 counter reaches zero
transportDispatcher.runDispatcher(3)
transportDispatcher.closeDispatcher()
Download
script.
See also: library reference.