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# -*- coding: binary -*-
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module Msf
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###
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#
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# This module provides methods for Distributed Reflective Denial of Service (DRDoS) attacks
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#
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###
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module Auxiliary::DRDoS
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  def initialize(info = {})
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    super
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    register_advanced_options(
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      [
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        OptAddress.new('SRCIP', [false, 'Use this source IP']),
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        OptInt.new('NUM_REQUESTS', [false, 'Number of requests to send', 1]),
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      ], self.class)
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  end
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  def setup
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    super
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    if spoofed? && datastore['NUM_REQUESTS'].to_i < 1
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      raise Msf::OptionValidateError.new(
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        {
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          'NUM_REQUESTS' => 'The number of requests must be >= 1'
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        }
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      )
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    end
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  end
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  def prove_amplification(response_map)
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    vulnerable = false
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    proofs = []
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    response_map.each do |request, responses|
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      responses ||= []
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      this_proof = ''
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      # compute packet amplification
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      if responses.size > 1
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        vulnerable = true
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        this_proof += "#{responses.size}x packet amplification"
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      else
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        this_proof += 'No packet amplification'
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      end
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      this_proof += ' and '
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      # compute bandwidth amplification
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      total_size = responses.map(&:size).reduce(:+)
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      bandwidth_amplification = total_size - request.size
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      if bandwidth_amplification > 0
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        vulnerable = true
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        if request.size == 0
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          multiplier = total_size
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        else
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          multiplier = total_size / request.size
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        end
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        this_proof += "a #{multiplier}x, #{bandwidth_amplification}-byte bandwidth amplification"
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      else
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        this_proof += 'no bandwidth amplification'
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      end
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      # TODO (maybe): show the request and responses in more detail?
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      proofs << this_proof
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    end
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    [ vulnerable, proofs.join(', ') ]
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  end
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  def spoofed?
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    !datastore['SRCIP'].nil?
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  end
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end
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end
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