[英]How to get data from SNMP with python?
如何从fdb表获取值mac和vlan使用python?
在bash snmpwalk工作正常:
snmpwalk -v2c -c pub 192.168.0.100 1.3.6.1.2.1.17.7.1.2.2.1.2
pysnmp:
import os, sys
import socket
import random
from struct import pack, unpack
from datetime import datetime as dt
from pysnmp.entity.rfc3413.oneliner import cmdgen
from pysnmp.proto.rfc1902 import Integer, IpAddress, OctetString
ip='192.168.0.100'
community='pub'
value=(1,3,6,1,2,1,17,7,1,2,2,1,2)
generator = cmdgen.CommandGenerator()
comm_data = cmdgen.CommunityData('server', community, 1) # 1 means version SNMP v2c
transport = cmdgen.UdpTransportTarget((ip, 161))
real_fun = getattr(generator, 'getCmd')
res = (errorIndication, errorStatus, errorIndex, varBinds)\
= real_fun(comm_data, transport, value)
if not errorIndication is None or errorStatus is True:
print "Error: %s %s %s %s" % res
else:
print "%s" % varBinds
输出:[(ObjectName(1.3.6.1.2.1.17.7.1.2.2.1.2),NoSuchInstance(''))]
import netsnmp
def getmac():
oid = netsnmp.VarList(netsnmp.Varbind('.1.3.6.1.2.1.17.7.1.2.2.1.2'))
res = netsnmp.snmpgetbulk(oid, Version = 2, DestHost='192.168.0.100',
Community='pub')
return res
print getmac()
输出:('27','27','25','27','27','27','24','27','25','18','4','27' ,'25','27','27','25','27','27','27','27','27','27','27','27',' 27','27','27','27','27','27','27','27','23','25','27','27','27' ,'25','27','25','27','27','25','27','27','27','27','27','27',' 27','27','27','25','27','27','27','27','27','27','27','27','27' ,'27','27','27','25','25','25','7','27','27','9','25','27',' 20','19','27','27','27','27','27','27','27','27','27','27','27' ,'27','27','27','11','25','27','27','27','27','27','27','27',' 27','27','27','27','27','27','27','25','27','27','27','27','27' ,'27','27','27','27','2','27','5','27','0','27','27','27',' 27','27')
第一个脚本(pysnmp)返回NoSuchInstance。 第二个脚本(netsnmp)返回端口列表但没有mac和vlan。 怎么了?
在pysnmp示例中,您正在执行SNMPGET(snmpget),而不是GETNEXT(snmpwalk)。 如果你改变了,
real_fun = getattr(generator, 'getCmd')
至
real_fun = getattr(generator, 'nextCmd')
你会开始看到有用的结果。
至于你在snmpwalk
和python net-snmp
绑定结果之间的结果中看到的差异: snmpwalk
和snmpbulkget
表现不同。 如果您使用与snmpwalk
相同的选项从命令行执行snmpbulkget
,您将收到与python net-snmp
示例相同的结果。
如果您在python net-snmp
示例中更新以下行,
res = netsnmp.snmpgetbulk(oid, Version=2, DestHost='192.168.0.100',
Community='pub')
至
res = netsnmp.snmpwalk(oid, Version=2, DestHost='192.168.0.100',
Community='pub')
那么你现在应该从python net-snmp
示例获得相同的结果列表,就像在命令行上执行snmpwalk
时所看到的那样。
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