运行python脚本解析IOS配置文件时出现错误消息

Question

我已经能够编写一个python脚本来解析IOS配置文件，但是我得到了一个错误。

以下是脚本：

import glob, os
from ciscoconfparse import CiscoConfParse
os.chdir("T:/")
for cfgfile in glob.glob("*-confg"):
    parse = CiscoConfParse("T:/" + cfgfile, factory=True, syntax='ios')
    host = parse.find_objects_dna(r'Hostname') 
    interfaces_with_helpers = parse.find_parents_w_child( "^interf", "ip helper-address 10.194.35.201")
    if interfaces_with_helpers:
        print (host[0].hostname)
    for interface in interfaces_with_helpers:
        print (interface)

当我运行脚本时，它似乎运行得很好，然后得到以下错误：

Traceback (most recent call last):
File "<stdin>", line 2, in <module>
File "C:\Python34\lib\site-packages\ciscoconfparse-1.2.37-py3.4.egg\ciscoconfparse\ciscoconfparse.py", line 186, in __init__ CiscoConfParse=self)
File "C:\Python34\lib\site-packages\ciscoconfparse-1.2.37-py3.4.egg\ciscoconfparse\ciscoconfparse.py", line 2209, in __init__
self._list = self._bootstrap_obj_init(data)
File "C:\Python34\lib\site-packages\ciscoconfparse-1.2.37-py3.4.egg\ciscoconfparse\ciscoconfparse.py", line 2433, in _bootstrap_obj_init
syntax='ios')
File "C:\Python34\lib\site-packages\ciscoconfparse-1.2.37-py3.4.egg\ciscoconfparse\ciscoconfparse.py", line 2982, in ConfigLineFactory
comment_delimiter=comment_delimiter) # instance of the proper subclass
File "C:\Python34\lib\site-packages\ciscoconfparse-1.2.37-py3.4.egg\ciscoconfparse\models_cisco.py", line 1758, in __init__raise ValueError
ValueError
>>>

Answer 1

在我看来，这是一种意想不到的配置文件格式。如果您查看CiscoConfParse库中抛出ValueError的源代码：

    REGEX = r'^aaa\sgroup\sserver\s(?P<protocol>\S+)\s(?P<group>\S+)$'
    mm = re.search(REGEX, self.text)
    if not (mm is None):
        groups = mm.groupdict()
        self.protocol = groups.get('protocol', '')
        self.group = groups.get('group', '')
    else:
        raise ValueError

它看起来像是偶然发现了一个配置文件，在该文件中它希望该行满足正则表达式^aaa\sgroup\sserver\s(?P<protocol>\S+)\s(?P<group>\S+)$，但失败了。

当您迭代glob.glob("*-confg")的结果时，您需要打印出当前正在处理的文件名，以查看哪个文件格式不正确。然后更正此配置文件，或缩小您要解析的配置文件的范围。

您也可以忽略该错误，如下所示：

import glob, os
from ciscoconfparse import CiscoConfParse
os.chdir("T:/")
for cfgfile in glob.glob("*-confg"):
    try:
        parse = CiscoConfParse("T:/" + cfgfile, factory=True, syntax='ios')
    except ValueError:
        print "Malformed config file found. Skipping " + cfgfile
        continue
    host = parse.find_objects_dna(r'Hostname') 
    interfaces_with_helpers = parse.find_parents_w_child( "^interf", "ip helper-address 10.194.35.201")
    if interfaces_with_helpers:
        print (host[0].hostname)
    for interface in interfaces_with_helpers:
        print (interface)