Python-正则表达式从snmp walk输出中提取IP和掩码 [英] Python - regex to extract IP and Mask from snmp walk output

问题描述

我正努力使用正则表达式从snmp walk输出中提取IP和子网掩码信息.这是输出的样子.

I am struggling with regex to extract IP and subnet mask info from a snmp walk output. Here is how output looks like.

[<SNMPVariable value='255.255.255.0' (oid='iso.3.6.1.2.1.4.21.1.11.10.10.2.0', oid_index='', snmp_type='IPADDR')>, <SNMPVariable value='255.255.255.192' (oid='iso.3.6.1.2.1.4.21.1.11.10.0.0.0', oid_index='', snmp_type='IPADDR')>, <SNMPVariable value='255.255.255.0' (oid='iso.3.6.1.2.1.4.21.1.11.10.10.10.0', oid_index='', snmp_type='IPADDR')>, <SNMPVariable value='255.255.255.252' (oid='iso.3.6.1.2.1.4.21.1.11.10.11.0.0', oid_index='', snmp_type='IPADDR')>,

我将输出组织在不同的行中，这样很容易理解(我的代码中的实际输出是上面没有行的输出):

I have organized the output in different lines just so it is easy to understand (actual output in my code is the above one without lines):

[<SNMPVariable value='255.255.255.0' (oid='iso.3.6.1.2.1.4.21.1.11.10.10.2.0', oid_index='', snmp_type='IPADDR')>, 
<SNMPVariable value='255.255.255.192' (oid='iso.3.6.1.2.1.4.21.1.11.10.0.0.0', oid_index='', snmp_type='IPADDR')>, 
<SNMPVariable value='255.255.255.0' (oid='iso.3.6.1.2.1.4.21.1.11.10.10.10.0', oid_index='', snmp_type='IPADDR')>, 
<SNMPVariable value='255.255.255.252' (oid='iso.3.6.1.2.1.4.21.1.11.10.11.0.0', oid_index='', snmp_type='IPADDR')>,

因此，在每个块之间，我们都有子网掩码(value ='255.255.255.0')和ip地址(oid ='iso.3.6.1.2.1.4.21.1.11. 10.10.2.0 ')

So between each block, we have subnet mask (value='255.255.255.0') and ip address (oid='iso.3.6.1.2.1.4.21.1.11.10.10.2.0')

我需要提取该信息并将其保存在数组/列表中，这样它将看起来像这样:

I need to to extract that info and save it in an array/list so it will look like this:

(10.10.2.0/255.255.255.0, 10.0.0.0/255.255.255.192, and so on ...)

我相信正则表达式将是最好的解决方案，但是尽管进行了许多小时的研究，但尝试似乎无法找到解决方案.

I believe regex would be the best solution but despite many hours of research and trying I can't seem to find a solution.

这是我到目前为止所拥有的:

Here is what I have so far:

<some code omitted ..>
# contains SNMP output displayed above
print snmp_output
str_result = ''.join(str(snmp_output))
regex = re.findall(r"\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b", str_result)
print regex

它给了我这个输出:

['255.255.255.0', '3.6.1.2', '1.4.21.1', '11.10.10.2', '255.255.255.192', '3.6.1.2', '1.4.21.1', '11.10.0.0', '255.255.255.0', and so on ...]

我想第一步是要走出去，那只会给我面具和IP，而中间没有#.

I guess the first step would be to get out that only gives me mask and IP and not there #s in between.

任何帮助将不胜感激.

谢谢达蒙

for item in system_items:
    print '{oid}.{oid_index} {snmp_type} = {value}'.format(
        oid=item.oid,
        oid_index=item.oid_index,
        snmp_type=item.snmp_type,
        value=item.value

推荐答案

要获得问题中的输出，请按以下步骤操作:

To get the output as you have it in your question:

>>> import re
>>> regex = re.compile(r'(?:\d+\.){3}\d+$')
>>> tuple('{}/{}'.format(regex.search(item.oid).group(0), item.value)
...       for item in system_items)

我没有安装 PySNMP ，但这是一个测试:

I don't have PySNMP installed, but here's a test:

>>> class SNMPVariable(object):
...     def __init__(self, value, oid):
...         self.value = value
...         self.oid = oid
...         

>>> s1 = SNMPVariable('255.255.255.0', 'iso.3.6.1.2.1.4.21.1.11.10.10.2.0')

>>> s2 = SNMPVariable('255.255.255.252', 'iso.3.6.1.2.1.4.21.1.11.10.11.0.0')

>>> system_items = [s1, s2]

>>> tuple('{}/{}'.format(regex.search(item.oid).group(0), item.value)
...       for item in system_items)
...       
('10.10.2.0/255.255.255.0', '10.11.0.0/255.255.255.252')

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