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Erlang Authoritative DNS Server

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erldns src pipes erldns_empty_verification.erl
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src/pipes/erldns_empty_verification.erl 

-module(erldns_empty_verification).

-moduledoc """

Raise an event if the given message is empty or refused.

""".



-include_lib("kernel/include/logger.hrl").

-include_lib("dns_erlang/include/dns.hrl").



-behaviour(erldns_pipeline).



-export([call/2]).



-spec call(dns:message(), erldns_pipeline:opts()) ->

    dns:message() | {dns:message(), erldns_pipeline:opts()} | {stop, dns:message()}.

call(#dns_message{rc = RC, anc = ANC, auc = AUC, adc = ADC} = Msg, #{resolved := true}) ->

    case {RC, ANC, AUC, ADC} of

        {?DNS_RCODE_REFUSED, _, _, _} ->

            telemetry:execute([erldns, handler, refused], #{count => 1}, #{}),

            Msg;

        {_, 0, 0, 0} ->

            ?LOG_INFO(#{what => empty_response, message => Msg}),

            telemetry:execute([erldns, handler, empty], #{count => 1}, #{}),

            Msg;

        _ ->

            Msg

    end;

call(Msg, _) ->

    Msg.