asyncio bulkwalk stuck in loop

I am having issues with a snmp bulkwalk stoping correctly in asyncio. To me, it seems like the part that is suppose to stop the loop is the value of the isEndOfMib var. However, it keeps scanning OIDs that are way beyond it’s range of the mib. I tried a couple other mibs, but it is the same issues.

Here is where I based my example off of.

http://snmplabs.com/pysnmp/examples/hlapi/asyncio/manager/cmdgen/walking-operations.html

import asyncio
from pysnmp.hlapi.asyncio import *


@asyncio.coroutine
def run(varBinds):
    snmpEngine = SnmpEngine()
    while True:
        (errorIndication,
         errorStatus,
         errorIndex,
         varBindTable) = yield from bulkCmd(
            snmpEngine,
            CommunityData('public', mpModel=0),
            UdpTransportTarget(('10.161.105.59', 161)),
            ContextData(),
            0, 50,
            *varBinds)

        if errorIndication:
            print(errorIndication)
            break
        elif errorStatus:
            print('%s at %s' % (
                errorStatus.prettyPrint(),
                errorIndex and varBinds[int(errorIndex) - 1][0] or '?'
            )
                  )
        else:
            for varBindRow in varBindTable:
                for varBind in varBindRow:
                    print(' = '.join([x.prettyPrint() for x in varBind]))

        varBinds = varBindTable[-1]
        if isEndOfMib(varBinds):
            break

    snmpEngine.transportDispatcher.closeDispatcher()


loop = asyncio.get_event_loop()
loop.run_until_complete(
    run([ObjectType(ObjectIdentity('SNMPv2-MIB', 'sysDescr'))])
)

SNMPv2-MIB::sysDescr.0 = Cisco IOS Software, IOSv Software (VIOS-ADVENTERPRISEK9-M), Version 15.6(2)T, RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2016 by Cisco Systems, Inc.
Compiled Tue 22-Mar-16 16:19 by prod_rel_team
SNMPv2-MIB::sysObjectID.0 = SNMPv2-SMI::enterprises.9.1.1041
SNMPv2-MIB::sysUpTime.0 = 239948
SNMPv2-MIB::sysContact.0 = 
SNMPv2-MIB::sysName.0 = IOS.test.com
SNMPv2-MIB::sysLocation.0 = 
SNMPv2-MIB::sysServices.0 = 78
SNMPv2-MIB::sysORLastChange.0 = 0
SNMPv2-MIB::sysORID.1 = SNMPv2-SMI::enterprises.9.7.129
SNMPv2-MIB::sysORID.2 = SNMPv2-SMI::enterprises.9.7.115
SNMPv2-MIB::sysORID.3 = SNMPv2-SMI::enterprises.9.7.265
SNMPv2-MIB::sysORID.4 = SNMPv2-SMI::enterprises.9.7.112
SNMPv2-MIB::sysORID.5 = SNMPv2-SMI::enterprises.9.7.106
SNMPv2-MIB::sysORID.6 = SNMPv2-SMI::enterprises.9.7.47
SNMPv2-MIB::sysORID.7 = SNMPv2-SMI::enterprises.9.7.122
SNMPv2-MIB::sysORID.8 = SNMPv2-SMI::enterprises.9.7.37
SNMPv2-MIB::sysORID.9 = SNMPv2-SMI::enterprises.9.7.92
SNMPv2-MIB::sysORID.10 = SNMPv2-SMI::enterprises.9.7.53
SNMPv2-MIB::sysORID.11 = SNMPv2-SMI::enterprises.9.7.54
SNMPv2-MIB::sysORID.12 = SNMPv2-SMI::enterprises.9.7.52
SNMPv2-MIB::sysORID.13 = SNMPv2-SMI::enterprises.9.7.93
SNMPv2-MIB::sysORID.14 = SNMPv2-SMI::enterprises.9.7.186
SNMPv2-MIB::sysORID.15 = SNMPv2-SMI::enterprises.9.7.128
SNMPv2-MIB::sysORID.16 = SNMPv2-SMI::enterprises.9.7.425
SNMPv2-MIB::sysORID.17 = SNMPv2-SMI::enterprises.9.7.517
SNMPv2-MIB::sysORID.18 = SNMPv2-SMI::enterprises.9.7.516
SNMPv2-MIB::sysORID.19 = SNMPv2-SMI::enterprises.9.7.518
Will not exit loop.

Here is a example when I ran it with snmpbulk command line.

[john@johnxps mibs]$ snmpbulkwalk -v2c -c public -Oq 10.161.105.59  sysDescr
SNMPv2-MIB::sysDescr.0 Cisco IOS Software, IOSv Software (VIOS-ADVENTERPRISEK9-M), Version 15.6(2)T, RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2016 by Cisco Systems, Inc.
Compiled Tue 22-Mar-16 16:19 by prod_rel_team

Any help is appreciated.

Thank you,

John

[etingof]

BTW, mpModel=0 means SNMP v1 which does not implement GETBULK so GETNEXT is being used instead.

[etingof]

Oh, I was wrong about lexicographicMode - this option is only available in synchronous API. Sorry about that!

So if you want similar behavior with asyncio I am thinking you should do something like this:

@asyncio.coroutine
def run(varBinds):
    snmpEngine = SnmpEngine()
    initialVarBinds = varBinds
    while True:
        (errorIndication,
         errorStatus,
         errorIndex,
         varBindTable) = yield from bulkCmd(
            snmpEngine,
            CommunityData('public', mpModel=0),
            UdpTransportTarget(('demo.snmplabs.com', 161)),
            ContextData(),
            0, 50,
            *varBinds)

        if errorIndication:
            print(errorIndication)
            break
        elif errorStatus:
            print('%s at %s' % (
                errorStatus.prettyPrint(),
                errorIndex and varBinds[int(errorIndex) - 1][0] or '?'
            )
                  )
        else:
            for varBindRow in varBindTable:
                for idx, varBind in enumerate(varBindRow):
                    print(' = '.join([x.prettyPrint() for x in varBind]))

        varBinds = varBindTable[-1]
        if isEndOfMib(varBinds):
            break

        for varBind in varBinds:
            if initialVarBinds[0][idx].isPrefixOf(varBind[0]):
                break

        else:
            break