GETNEXT Command Generator

from pysnmp.carrier.asynsock.dispatch import AsynsockDispatcher
from pysnmp.carrier.asynsock.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]

SNMP table header

headVars = [ pMod.ObjectIdentifier((1.3.6.1.2.1.3.1.1.2)) ]

Build PDU

reqPDU = pMod.GetNextRequestPDU()
pMod.apiPDU.setDefaults(reqPDU)
pMod.apiPDU.setVarBinds(
reqPDU, map(lambda x, pMod=pMod: (x, pMod.Null()), headVars)
)

Build message

reqMsg = pMod.Message()
pMod.apiMessage.setDefaults(reqMsg)
pMod.apiMessage.setCommunity(reqMsg, 'public')
pMod.apiMessage.setPDU(reqMsg, reqPDU)

startedAt = time()

def cbTimerFun(timeNow):
if timeNow - startedAt > 3:
raise "Request timed out"

def cbRecvFun(transportDispatcher, transportDomain, transportAddress,
wholeMsg, reqPDU=reqPDU, headVars=headVars):
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 and errorStatus != 2:
raise errorStatus
# Format var-binds table
varBindTable = pMod.apiPDU.getVarBindTable(reqPDU, rspPDU)
# Report SNMP table
for tableRow in varBindTable:
for name, val in tableRow:
if val is None:
continue
print 'from: %s, %s = %s' % (
transportAddress, name.prettyPrint(), val.prettyPrint()
)
# Stop on EOM
for oid, val in varBindTable[-1]:
if val is not None:
break
else:
transportDispatcher.jobFinished(1)

        # Generate request for next row
        pMod.apiPDU.setVarBinds(
            reqPDU, map(lambda (x,y),n=pMod.Null(): (x,n), varBindTable[-1])
            )
        pMod.apiPDU.setRequestID(reqPDU, pMod.getNextRequestID())
        transportDispatcher.sendMessage(
            encoder.encode(reqMsg), transportDomain, transportAddress
            )
        global startedAt
        if time() - startedAt > 3:
            raise 'Request timed out'
        startedAt = time()
return wholeMsg

transportDispatcher = AsynsockDispatcher()
transportDispatcher.registerTransport(
udp.domainName, udp.UdpSocketTransport().openClientMode()
)
transportDispatcher.registerRecvCbFun(cbRecvFun)
transportDispatcher.registerTimerCbFun(cbTimerFun)
transportDispatcher.sendMessage(
encoder.encode(reqMsg), udp.domainName, ('192.168.255.5', 161)
)
transportDispatcher.jobStarted(1)
transportDispatcher.runDispatcher()
transportDispatcher.closeDispatcher()

คือมันจะได้ OID อื่นติดมาด้วยครับ คือผมอยากเฉพาะ OID 1.3.6.1.2.1.3.1.1.2 เท่านั้นครับต้องเพิ่มคำสั่งอะไรครับช่วยแนะนำด้วยครับ ขอบคุณครับ