old_contents: # coding: utf-8
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  from __future__ import unicode_literals
  
  from testinfra.modules.base import InstanceModule
  
  
  class Iptables(InstanceModule):
      """Test iptables rule exists"""
  
      def rules(self, table='filter', chain=None):
          """Returns list of iptables rules
  
             Based on ouput of `iptables -t TABLE -S CHAIN` command
  
               optionally takes takes the following arguments:
                 - table: defaults to `filter`
                 - chain: defaults to all chains
  
          >>> host.iptables.rules()
          [
              '-P INPUT ACCEPT',
              '-P FORWARD ACCEPT',
              '-P OUTPUT ACCEPT',
              '-A INPUT -i lo -j ACCEPT',
              '-A INPUT -j REJECT'
              '-A FORWARD -j REJECT'
          ]
          >>> host.iptables().get_rules("nat", "INPUT")
          ['-P PREROUTING ACCEPT']
  
          """
  
          rules = []
          if chain:
              cmd = "iptables -t {0} -S {1}".format(table, chain)
          else:
              cmd = "iptables -t {0} -S".format(table)
  
          for line in self.check_output(cmd).splitlines():
              line = line.replace("\t", " ")
              rules.append(line)
          return rules
  
new_contents: # coding: utf-8
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  from __future__ import unicode_literals
  
  from testinfra.modules.base import InstanceModule
  
  
  class Iptables(InstanceModule):
      """Test iptables rule exists"""
  
      def rules(self, table='filter', chain=None):
          """Returns list of iptables rules
  
             Based on ouput of `iptables -t TABLE -S CHAIN` command
  
               optionally takes takes the following arguments:
                 - table: defaults to `filter`
                 - chain: defaults to all chains
  
          >>> host.iptables.rules()
          [
              '-P INPUT ACCEPT',
              '-P FORWARD ACCEPT',
              '-P OUTPUT ACCEPT',
              '-A INPUT -i lo -j ACCEPT',
              '-A INPUT -j REJECT'
              '-A FORWARD -j REJECT'
          ]
          >>> host.iptables.rules("nat", "INPUT")
          ['-P PREROUTING ACCEPT']
  
          """
  
          rules = []
          if chain:
              cmd = "iptables -t {0} -S {1}".format(table, chain)
          else:
              cmd = "iptables -t {0} -S".format(table)
  
          for line in self.check_output(cmd).splitlines():
              line = line.replace("\t", " ")
              rules.append(line)
          return rules
  
subject: Fix iptables doc example