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Erlang Authoritative DNS Server
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Files
src/pipes/erldns_empty_verification.erl
-module(erldns_empty_verification).
-moduledoc """
Raise an event if the given message is empty or refused.
## Telemetry events
May emit the following telemetry events:
### `[erldns, pipeline, refused]`
Emitted when the empty verification pipe sees a resolved response with rcode REFUSED.
- **Measurements:** `#{count => 1}`
- **Metadata:** `#{}`
### `[erldns, pipeline, empty]`
Emitted when the empty verification pipe sees a resolved response with zero answer,
authority, and additional records.
- **Measurements:** `#{count => 1}`
- **Metadata:** `#{}`
""".
-include_lib("kernel/include/logger.hrl").
-include_lib("dns_erlang/include/dns.hrl").
-behaviour(erldns_pipeline).
-export([call/2]).
-doc "`c:erldns_pipeline:call/2` callback.".
-spec call(dns:message(), erldns_pipeline:opts()) -> 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, pipeline, refused], #{count => 1}, #{}),
Msg;
{_, 0, 0, 0} ->
?LOG_INFO(#{what => empty_response, message => Msg}, #{domain => [erldns, pipeline]}),
telemetry:execute([erldns, pipeline, empty], #{count => 1}, #{}),
Msg;
_ ->
Msg
end;
call(Msg, _) ->
Msg.