discourse/lib/ip_addr.rb

class IPAddr

  def self.handle_wildcards(val)
    return if val.blank?

    num_wildcards = val.count('*')

    return val if num_wildcards == 0

    # strip ranges like "/16" from the end if present
    v = val.gsub(/\/.*/, '')

    return if v[v.index('*')..-1] =~ /[^\.\*]/

    parts = v.split('.')
    (4 - parts.size).times { parts << '*' } # support strings like 192.*
    v = parts.join('.')

    "#{v.gsub('*', '0')}/#{32 - (v.count('*') * 8)}"
  end

  def to_cidr_s
    if @addr
      mask = @mask_addr.to_s(2).count('1')
      if mask == 32
        to_s
      else
        "#{to_s}/#{mask}"
      end
    else
      nil
    end
  end

end