sfatables/commands/Add.py

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