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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 working with NFS
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  #
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  ###
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  module Auxiliary::Nfs
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    include Auxiliary::Scanner
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    def initialize(info = {})
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      super
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      register_options(
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        [
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          OptAddressLocal.new('LHOST', [false, 'IP to match shares against', Rex::Socket.source_address]),
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          OptString.new('HOSTNAME', [false, 'Hostname to match shares against', ''])
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        ]
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      )
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    end
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    def can_mount?(locations, mountable = true, hostname = '', lhost = '')
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      # attempts to validate if we'll be able to open it or not based on:
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      # 1. its a wildcard, thus we can open it
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      # 2. hostname isn't blank and its in the list
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      # 3. our IP is explicitly listed
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      # 4. theres a CIDR notation that we're included in.
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      return true unless mountable
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      return true if locations.include? '*'
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      return true if !hostname.blank? && locations.include?(hostname)
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      return true if !lhost.empty? && locations.include?(lhost)
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      locations.each do |location|
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        # if it has a subnet mask, convert it to cidr
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        if %r{(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}/)(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})} =~ location
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          location = "#{Regexp.last_match(1)}#{Rex::Socket.addr_atoc(Regexp.last_match(2))}"
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        end
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        return true if Rex::Socket::RangeWalker.new(location).include?(lhost)
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        # at this point we assume its a hostname, so we use Ruby's File fnmatch so that it processes the wildcards
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        # as its a quick and easy way to use glob matching for wildcards and get a boolean response
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        return true if File.fnmatch(location, hostname)
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      end
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      false
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    end
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  end
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end
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