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mdns_lite

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A simple, no frills mDNS implementation in Elixir

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mdns_lite lib mdns_lite client.ex
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lib/mdns_lite/client.ex 

defmodule MdnsLite.Client do

  @moduledoc false



  import MdnsLite.DNS

  alias MdnsLite.DNS



  @doc """

  Helper for creating an A-record query

  """

  @spec query_a(String.t()) :: DNS.dns_query()

  def query_a(hostname) do

    dns_query(class: :in, type: :a, domain: to_charlist(hostname))

  end



  @doc """

  Helper for creating a AAAA-record query

  """

  @spec query_aaaa(String.t()) :: DNS.dns_query()

  def query_aaaa(hostname) do

    dns_query(class: :in, type: :aaaa, domain: to_charlist(hostname))

  end



  @spec encode(DNS.dns_query(), unicast: boolean()) :: binary()

  def encode(dns_query() = query, options \\ []) do

    dns_rec(

      # RFC6762: Query ID SHOULD be set to zero

      header: dns_header(id: 0, qr: false, aa: false, rcode: 0),

      # Query list. Must be empty according to RFC 6762 Section 6.

      qdlist: [request_unicast(query, options[:unicast])],

      # A list of answer entries. Can be empty.

      anlist: [],

      # nslist Can be empty.

      nslist: [],

      # arlist A list of resource entries. Can be empty.

      arlist: []

    )

    |> DNS.encode()

  end



  defp request_unicast(query, value) do

    dns_query(query, unicast_response: !!value)

  end

end