Question

我使用pysnmp 4.3.1，使用Packet Level SNMP语法我试图在GetNext请求之后寻找一种更改为Get请求的有效方法例如，我需要走遍整个分支（1.3.6.1.2.1.11），然后我需要得到这两个oid（1.3.6.1.2.1.1.1.0,1.3.6.1.2.1.1.3.0）。
我还需要在SNMPv1上执行这些请求，而不需要任何varbinds。这是我的代码：

from pysnmp.carrier.asyncore.dispatch import AsyncoreDispatcher
from pysnmp.carrier.asyncore.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.protoModules[api.protoVersion2c]

# SNMP table header
headVars = [ pMod.ObjectIdentifier((1,3,6,1,2,1,11)) ]
next1 = '1.3.6.1.2.1.11'
get2 = '1.3.6.1.2.1.1.1.0'

# Build PDU
reqPDU =  pMod.GetNextRequestPDU()
pMod.apiPDU.setDefaults(reqPDU)
pMod.apiPDU.setVarBinds(reqPDU, [ (x, pMod.null) for x in 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 Exception("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 Exception(errorStatus)
            # Format var-binds table
            varBindTable = pMod.apiPDU.getVarBindTable(reqPDU, rspPDU)
            # Report SNMP table
            for tableRow in varBindTable:
                for name, val in tableRow:
                    print('from: %s, %s = %s' % (
                        transportAddress, name.prettyPrint(), val.prettyPrint()
                        )
                    )

            # Generate request for next row
            if(next1 in name.prettyPrint()):
                pMod.apiPDU.setVarBinds(
                    reqPDU, [ (x, pMod.null) for x,y in varBindTable[-1] ]
                    )
                pMod.apiPDU.setRequestID(reqPDU, pMod.getNextRequestID())
                transportDispatcher.sendMessage(
                    encoder.encode(reqMsg), transportDomain, transportAddress
                    )
            else:
                reqPDU = pMod.GetRequestPDU()
                pMod.apiPDU.setVarBinds(
                    reqPDU, [ (get2, pMod.null) ]
                    )
                pMod.apiPDU.setRequestID(reqPDU, pMod.getNextRequestID())
                transportDispatcher.sendMessage(
                    encoder.encode(reqMsg), transportDomain, transportAddress
                    )
            global startedAt
            if time() - startedAt > 3:
                raise Exception('Request timed out')
            startedAt = time()
    return wholeMsg

transportDispatcher = AsyncoreDispatcher()

transportDispatcher.registerRecvCbFun(cbRecvFun)
transportDispatcher.registerTimerCbFun(cbTimerFun)

transportDispatcher.registerTransport(
    udp.domainName, udp.UdpSocketTransport().openClientMode()
)
transportDispatcher.sendMessage(
    encoder.encode(reqMsg), udp.domainName, ('demo.snmplabs.com', 161)
)
transportDispatcher.jobStarted(1)

transportDispatcher.runDispatcher()

transportDispatcher.closeDispatcher()

此代码主要来自此GetNext示例如何使用SNMPv1而不使用varbinds从一系列GetNext请求更改为多个Get请求序列？

PYSNMP：如何有效地从GetNext请求更改为Get Request

0 个答案: