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erldns

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Erlang Authoritative DNS Server

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erldns src erldns_edns.erl
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src/erldns_edns.erl 

-module(erldns_edns).

-moduledoc false.



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



-export([get_opts/1, get_ede_errors/1]).



%% Get a property list of EDNS0 options.

%%

%% Supported options are:

%%

%% * {dnssec, true}

-spec get_opts(dns:message()) -> [proplists:property()].

get_opts(Message) ->

    get_opts(Message#dns_message.additional, []).



-spec get_opts([dns:rr() | dns:optrr()], [proplists:property()]) -> [proplists:property()].

get_opts([#dns_optrr{dnssec = true} | Rest], Opts) ->

    get_opts(Rest, [{dnssec, true} | Opts]);

get_opts([_RR | Rest], Opts) ->

    get_opts(Rest, Opts);

get_opts([], Opts) ->

    lists:reverse(Opts).



%% Extract Extended DNS Errors from a message.

%%

%% Returns a list of {InfoCode, ExtraText} tuples for all EDE options

%% found in the message's OPT RR.

-spec get_ede_errors(dns:message()) -> [{non_neg_integer(), binary()}].

get_ede_errors(Message) ->

    get_ede_errors(Message#dns_message.additional, []).



-spec get_ede_errors([dns:rr() | dns:optrr()], [{non_neg_integer(), binary()}]) ->

    [{non_neg_integer(), binary()}].

get_ede_errors([#dns_optrr{data = Data} | Rest], Acc) ->

    EDEList = [

        {InfoCode, ExtraText}

     || #dns_opt_ede{info_code = InfoCode, extra_text = ExtraText} <- Data

    ],

    get_ede_errors(Rest, EDEList ++ Acc);

get_ede_errors([_RR | Rest], Acc) ->

    get_ede_errors(Rest, Acc);

get_ede_errors([], Acc) ->

    lists:reverse(Acc).