python之运行 python 脚本解析 IOS 配置文件时出现错误消息

我已经能够编写一个解析 IOS 配置文件的 python 脚本，但我收到了一个错误。

脚本如下:

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，它似乎运行良好，然后出现以下错误:

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 
>>> 

请您参考如下方法:

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 的来源:

    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 

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

当您迭代 glob.glob("*-confg") 的结果时，您将需要打印出您当前正在使用的文件名，以查看哪个文件格式错误。然后更正此配置文件，或缩小您尝试解析的配置文件的范围。

您也可以忽略错误，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)