ubuntu14.04 使用pysnmp SNMP trap接收_apipdu.getvarbindlist-优快云博客

本文链接：https://blog.youkuaiyun.com/cauckfgf/article/details/46723771

本文详细介绍了如何使用Python的pysnmp库接收SNMP v1/v2c/v3版本的trap消息，并解析其中的trap类型、企业标识、代理地址、时间戳等关键信息。通过自定义回调函数cbFun处理接收到的消息，实现对SNMP陷阱消息的高效处理。

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下载安装pysnmp-4.2.5.tar.gz (md5)

https://pypi.python.org/pypi/pysnmp/

from pysnmp.carrier.asynsock.dispatch import AsynsockDispatcher
from pysnmp.carrier.asynsock.dgram import udp, udp6
from pyasn1.codec.ber import decoder
from pysnmp.proto import api
from test_case_common import *

def cbFun(transportDispatcher, transportDomain, transportAddress, wholeMsg):
    while wholeMsg:
        msgVer = int(api.decodeMessageVersion(wholeMsg))
        if msgVer in api.protoModules:
            pMod = api.protoModules[msgVer]
        else:
            print('Unsupported SNMP version %s' % msgVer)
            return
        reqMsg, wholeMsg = decoder.decode(
            wholeMsg, asn1Spec=pMod.Message(),
            )
        print('Notification message from %s:%s: ' % (
            transportDomain, transportAddress
            )
        )
        reqPDU = pMod.apiMessage.getPDU(reqMsg)
        if reqPDU.isSameTypeWith(pMod.TrapPDU()):
            if msgVer == api.protoVersion1:
                print('Enterprise: %s' % (
                    pMod.apiTrapPDU.getEnterprise(reqPDU).prettyPrint()
                    )
                )
                print('Agent Address: %s' % (
                    pMod.apiTrapPDU.getAgentAddr(reqPDU).prettyPrint()
                    )
                )
                print('Generic Trap: %s' % (
                    pMod.apiTrapPDU.getGenericTrap(reqPDU).prettyPrint()
                    )
                )
                print('Specific Trap: %s' % (
                    pMod.apiTrapPDU.getSpecificTrap(reqPDU).prettyPrint()
                    )
                )
                print('Uptime: %s' % (
                    pMod.apiTrapPDU.getTimeStamp(reqPDU).prettyPrint()
                    )
                )
                varBinds = pMod.apiTrapPDU.getVarBindList(reqPDU)
            else:
                varBinds = pMod.apiPDU.getVarBindList(reqPDU)
            print('Var-binds:')
            for oid, val in varBinds:
                a = oid.prettyPrint().strip()
                b = val.prettyPrint().strip().split('\n')
                print a
                for line in b:
                    item = line.strip()
                    if item.startswith('string-value'):
                        print 'string-value='+item.replace('string-value=0x','').decode('hex')
                    else:
                        print item
    return wholeMsg

if __name__ == '__main__':
    transportDispatcher = AsynsockDispatcher()

    transportDispatcher.registerRecvCbFun(cbFun)

    # UDP/IPv4
    transportDispatcher.registerTransport(
        udp.domainName, udp.UdpSocketTransport().openServerMode(('0.0.0.0', 162))
    )

    # UDP/IPv6
    transportDispatcher.registerTransport(
        udp6.domainName, udp6.Udp6SocketTransport().openServerMode(('::1', 162))
    )

    transportDispatcher.jobStarted(1)

    try:
        # Dispatcher will never finish as job#1 never reaches zero
        transportDispatcher.runDispatcher()
    except:
        transportDispatcher.closeDispatcher()
        raise