pysnmp Agent with HOST-RESOURCES-MIB

Question

我試圖監視一個使用opennms的python進程。爲此，我需要實現支持HOST-RESOURCES-MIB的代理。 Opennms通過檢查HOST-RESOURCES-MIB的hrSwRunTable來檢查進程的狀態。該測試通過將給定進程與hrSwRunState的數值匹配爲hrSwRunName來完成。

pysnmp給出了一些編寫我試圖修改的代理的例子，但我沒有太大的成功。

我的代碼的相關部分如下

import logging 

from pysnmp import debug 
from pysnmp.carrier.asyncore.dgram import udp 
from pysnmp.entity import engine, config 
from pysnmp.entity.rfc3413 import cmdrsp, context 
from pysnmp.proto.api import v2c 
from pysnmp.smi import builder, instrum, exval 


debug.setLogger(debug.Debug('all')) 

formatting = '[%(asctime)s-%(levelname)s]-(%(module)s) %(message)s' 
logging.basicConfig(level=logging.DEBUG, format=formatting,) 

logging.info("Starting....") 

# Create SNMP engine 
snmpEngine = engine.SnmpEngine() 

# Transport setup 

# UDP over IPv4 
config.addTransport(
    snmpEngine, 
    udp.domainName, 
    udp.UdpTransport().openServerMode(('mypc', 12345)) 
) 

# SNMPv2c setup 

# SecurityName <-> CommunityName mapping. 
config.addV1System(snmpEngine, 'my-area', 'public') 

# Allow read MIB access for this user/securityModels at VACM 
config.addVacmUser(snmpEngine, 2, 'my-area', 'noAuthNoPriv', (1, 3, 6, 1, 2, 1, 25, 4, 2), (1, 3, 6, 1, 2, 1, 25, 4, 2)) 

# Create an SNMP context 
snmpContext = context.SnmpContext(snmpEngine) 

# --- define custom SNMP Table within a newly defined EXAMPLE-MIB --- 

# ================================================================== 
logging.debug('Loading SNMP-TARGET-MIB module...'), 
mibBuilder1 = builder.MibBuilder().loadModules('SNMP-TARGET-MIB') 
logging.debug('done') 

logging.debug('Building MIB tree...'), 
mibInstrum1 = instrum.MibInstrumController(mibBuilder1) 
logging.debug('done') 

logging.debug('Building table entry index from human-friendly representation...') 

snmpTargetAddrEntry, = mibBuilder1.importSymbols('SNMP-TARGET-MIB', 'snmpTargetAddrEntry') 
instanceId1 = snmpTargetAddrEntry.getInstIdFromIndices('my-area') 
# ================================================================== 


logging.debug('Loading HOST-RESOURCES-MIB module...'), 
mibBuilder = builder.MibBuilder().loadModules('HOST-RESOURCES-MIB') 
logging.debug('done') 

logging.debug('Building MIB tree...'), 
mibInstrum = instrum.MibInstrumController(mibBuilder) 
logging.debug('done') 

logging.debug('Building table entry index from human-friendly representation...') 

# see http://www.oidview.com/mibs/0/HOST-RESOURCES-MIB.html 
hostRunTable, = mibBuilder.importSymbols('HOST-RESOURCES-MIB', 'hrSWRunEntry') 
instanceId = hostRunTable.getInstIdFromIndices('my-area') 
logging.debug('done') 

你會看到，在代碼的最後我想產生的「SNMP-TARGET-MIB-> snmpTargetAddrEntry」和「一個實例HOST-RESOURCES-MIB-> hrSWRunEntry」。 SNMP-TARGET-MIB（位於pysnmp文檔中）的代碼工作正常，但嘗試生成HOST-RESOURCES-MIB的代碼在嘗試生成線路上的實例時失敗instanceId = hostRunTable.getInstIdFromIndices('my-area')

錯誤是pyasn1.error.PyAsn1Error: Can't coerce 'my-area' into integer: invalid literal for int() with base 10: 'my-area'

任何人都可以闡明我做錯了什麼？我知道我是新來的SNMP，因此它很可能它是一個愚蠢的錯誤

Answer 1

按照HOST-RESOURCES-MIB，hrSWRunTable由hrSWRunIndex列索引，其值屬於Integer32類型：

hrSWRunEntry OBJECT-TYPE 
    SYNTAX  HrSWRunEntry 
    INDEX { hrSWRunIndex } 
    ::= { hrSWRunTable 1 } 

hrSWRunIndex OBJECT-TYPE 
    SYNTAX  Integer32 (1..2147483647) 
    ::= { hrSWRunEntry 1 } 

你是試圖根據字符串類型的索引值而不是整數來構建OID索引。這導致與字符串> INT轉換錯誤：

instanceId = hostRunTable.getInstIdFromIndices('my-area') 

所以你可能希望你的第一行有1作爲指標值：

instanceId = hostRunTable.getInstIdFromIndices(1) 

在這裏，我假設你計算instanceId爲目的爲您的新表格對象創建OID（例如MibScalarInstance）。