sfatables/commands/List.py

   1 import os, time
   2 import libxml2
   3
   4 from sfatables.globals import *
   5 from sfatables.pretty import Pretty
   6 from sfatables.command import Command
   7
   8 class List(Command):
   9
  10     def __init__(self):
  11         self.options = [('-L','--list')]
  12         self.help = 'List a chain'
  13         self.key='list_rule'
  14         self.matches = False
  15         self.targets = False
  16
  17         return
  18
  19     def get_info(self, type, xmlextension_path):
  20         xmldoc = libxml2.parseFile(xmlextension_path)
  21         p = xmldoc.xpathNewContext()
  22
  23         ext_name_node = p.xpathEval("/%s/@name"%type)
  24         ext_name = ext_name_node[0].content
  25
  26         name_nodes = p.xpathEval("//rule/argument[value!='']/name")
  27         value_nodes = p.xpathEval("//rule/argument[value!='']/value")
  28         element_nodes = p.xpathEval("//argument[value!='']/parent::rule/@element")
  29
  30         if (len(element_nodes)>1):
  31             raise Exception("Invalid rule %s contains multiple elements."%xmlextension_path)
  32
  33         element = []
  34         argument_str = ""
  35         if element_nodes:
  36             element = element_nodes[0].content
  37
  38             names = [n.content for n in name_nodes]
  39             values = [v.content for v in value_nodes]
  40
  41             name_values = zip(names,values)
  42             name_value_pairs = map(lambda (n,v):n+'='+v, name_values)
  43
  44             argument_str = ",".join(name_value_pairs)
  45
  46         p.xpathFreeContext()
  47         xmldoc.freeDoc()
  48
  49         return {'name':ext_name, 'arguments':argument_str, 'element':element}
  50
  51     def get_rule_list(self, chain_dir_path):
  52         broken_semantics = os.walk(chain_dir_path)
  53         rule_numbers = {}
  54
  55         for (root, dirs, files) in broken_semantics:
  56             for file in files:
  57                 if (file.startswith('sfatables')):
  58                     (magic,number,type) = file.split('-')
  59                     rule_numbers[int(number)]=1
  60
  61         rule_list = rule_numbers.keys()
  62         rule_list.sort()
  63         return rule_list
  64
  65     def call(self, command_options, match_options, target_options):
  66         if (len(command_options.args) < 1):
  67             print "Please specify the name of the chain you would like to list, e.g. sfatables -L INCOMING."
  68             return
  69
  70         chain = command_options.args[0]
  71         chain_dir = os.path.join(sfatables_config, chain)
  72
  73         rule_list = self.get_rule_list(chain_dir)
  74
  75         pretty = Pretty(['Rule','Match','Arguments','Target','Element','Arguments'])
  76
  77         for number in rule_list:
  78             match_file = "sfatables-%d-%s"%(number,'match')
  79             target_file = "sfatables-%d-%s"%(number,'target')
  80
  81             match_path = sfatables_config + '/' + chain + '/' + match_file
  82             target_path = sfatables_config + '/' + chain + '/' + target_file
  83
  84             match_info = self.get_info ('match',match_path)
  85             target_info = self.get_info ('target',target_path)
  86
  87             pretty.push_row(["%d"%number,
  88                              match_info['name'],
  89                              match_info['arguments'],
  90                              target_info['name'],
  91                              target_info['element'],
  92                              target_info['arguments']])
  93
  94         pretty.pprint()
  95
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