sfatables/commands/Add.py

   1 import os, time
   2 import libxml2
   3 from sfatables.command import Command
   4 from sfatables.globals import *
   5
   6 class Add(Command):
   7     options = [('-A','--add')]
   8     help = 'Add a rule to a chain'
   9     matches = True
  10     targets = True
  11
  12     def __init__(self):
  13         return
  14
  15     def getnextfilename(self,type,chain):
  16         dir = sfatables_config + "/"+chain;
  17         last_rule_number = 0
  18
  19         for (root, dirs, files) in os.walk(dir):
  20             for file in files:
  21                 if (file.startswith('sfatables-') and file.endswith(type)):
  22                     number_str = file.split('-')[1]
  23                     number = int(number_str)
  24                     if (number>last_rule_number):
  25                         last_rule_number = number
  26
  27         return "sfatables-%d-%s"%(last_rule_number+1,type)
  28
  29     def call_gen(self, chain, type, dir, options):
  30         filename = os.path.join(dir, options.name+".xml")
  31         xmldoc = libxml2.parseFile(filename)
  32
  33         p = xmldoc.xpathNewContext()
  34
  35         supplied_arguments = options.arguments
  36         if (hasattr(options,'element') and options.element):
  37             element = options.element
  38         else:
  39             element='*'
  40
  41         for option in supplied_arguments:
  42             option_name = option['name']
  43             option_value = getattr(options,option_name)
  44
  45             if (hasattr(options,option_name)):
  46                 context = p.xpathEval("//rule[@element='%s' or @element='*']/argument[name='%s']"%(element, option_name))
  47                 if (not context):
  48                     raise Exception('Unknown option %s for match %s and element %s'%(option,option['name'], element))
  49                 else:
  50                     # Add the value of option
  51                     valueNode = libxml2.newNode('value')
  52                     valueNode.addContent(option_value)
  53                     context[0].addChild(valueNode)
  54
  55         filename = self.getnextfilename(type,chain)
  56         file_path = os.path.join(sfatables_config, chain, filename)
  57         if not os.path.isdir(os.path.dirname(file_path)):
  58             os.makedirs(os.path.dirname(file_path))
  59         xmldoc.saveFile(file_path)
  60         p.xpathFreeContext()
  61         xmldoc.freeDoc()
  62
  63         return True
  64
  65     def call(self, command_options, match_options, target_options):
  66         chain = command_options.args[0]
  67         ret = self.call_gen(chain, 'match',match_dir, match_options)
  68         if (ret):
  69             ret = self.call_gen(chain, 'target',target_dir, target_options)
  70
  71         return ret