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toolshed lib_src core nslookup.ex
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lib_src/core/nslookup.ex 

defmodule Toolshed.Core.Nslookup do

  @doc """

  Lookup the specified hostname in the DNS and print out the addresses.



  ## Examples



      iex> nslookup "google.com"

      Name:     google.com

      Address:  172.217.7.238

      Address:  2607:f8b0:4004:804::200e

  """

  @spec nslookup(String.t()) :: :"do not show this result in output"

  def nslookup(name) do

    IO.puts("Name:     #{name}")

    name_charlist = to_charlist(name)



    case get_hosts_by_name(name_charlist, :inet) do

      [] -> IO.puts("IPv4 lookup failed")

      v4 -> print_addresses(v4)

    end



    case get_hosts_by_name(name_charlist, :inet6) do

      [] -> IO.puts("IPv6 lookup failed")

      v6 -> print_addresses(v6)

    end



    IEx.dont_display_result()

  end



  defp print_addresses(addresses) do

    Enum.each(addresses, &IO.puts("Address:  #{:inet.ntoa(&1)}"))

  end

end