Class: IPTables::ChainComparison

Inherits:
Object
  • Object
show all
Defined in:
lib/iptables/tables.rb

Instance Method Summary collapse

Constructor Details

#initialize(chain1, chain2) ⇒ ChainComparison

Returns a new instance of ChainComparison.



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# File 'lib/iptables/tables.rb', line 517

def initialize(chain1, chain2)
  raise "must provide two chains" unless (chain1.class == IPTables::Chain) and (chain2.class == IPTables::Chain)
  raise "first and second chain should have same name" unless chain1.name == chain2.name
  @chain1 = chain1
  @chain2 = chain2

  @including_comments = true
  @compared = false
end

Instance Method Details

#as_array ⇒ Object 



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# File 'lib/iptables/tables.rb', line 583

def as_array
  self.compare
  array = []
  return array if self.equal?
  array << "Changed chain: #{@chain1.name}"
  array << "New policy: #{@chain2.policy}" if self.new_policy?
  if self.missing.any?
    self.missing.keys.sort.each{ |rule_num|
      array << "-#{rule_num}: #{self.missing[rule_num]}"
    }
  end
  if self.new.any?
    self.new.keys.sort.each{ |rule_num|
      array << "+#{rule_num}: #{self.new[rule_num]}"
    }
  end
  return array
end

#compare ⇒ Object 



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# File 'lib/iptables/tables.rb', line 537

def compare
  return if @compared

  @equal = true

  @missing_rules = {}
  @new_rules = {}
  Diff::LCS.diff(
    @chain1.as_array(@including_comments), 
    @chain2.as_array(@including_comments)
  ).each{ |diffgroup|
    diffgroup.each{ |diff|
      if diff.action == '-'
        @missing_rules[diff.position] = diff.element
      else
        @new_rules[diff.position] = diff.element
      end
      @equal = false
    }
  }

  @new_policy = false
  unless @chain1.policy == @chain2.policy
    @new_policy = true
    @equal = false
  end

  @compared = true
  return nil
end

#equal? ⇒ Boolean

Returns:



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# File 'lib/iptables/tables.rb', line 568

def equal?
  self.compare
  return @equal
end

#ignore_comments ⇒ Object 



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# File 'lib/iptables/tables.rb', line 527

def ignore_comments
  @including_comments = false
  @compared = false
end

#include_comments ⇒ Object 



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# File 'lib/iptables/tables.rb', line 532

def include_comments
  @including_comments = true
  @compared = false
end

#missing ⇒ Object 



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# File 'lib/iptables/tables.rb', line 573

def missing
  self.compare
  return @missing_rules
end

#new ⇒ Object 



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# File 'lib/iptables/tables.rb', line 578

def new
  self.compare
  return @new_rules
end

#new_policy? ⇒ Boolean

Returns:



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# File 'lib/iptables/tables.rb', line 602

def new_policy?
  self.compare
  return @new_policy
end