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Erlang Authoritative DNS Server

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erldns src erldns_decoder.erl
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src/erldns_decoder.erl 

%% Copyright (c) 2012-2020, DNSimple Corporation

%%

%% Permission to use, copy, modify, and/or distribute this software for any

%% purpose with or without fee is hereby granted, provided that the above

%% copyright notice and this permission notice appear in all copies.

%%

%% THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES

%% WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

%% MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR

%% ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

%% WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN

%% ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF

%% OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.



%% @doc Safe response decoding, where exceptions will not result in a full

%% system crash

-module(erldns_decoder).



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

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



-export([decode_message/1]).



%% @doc Decode the binary data into its Erlang representation.

%%

%% Note that if the erldns catch_exceptions property is set in the

%% configuration, then this function should never throw an

%% exception.

-spec decode_message(dns:message_bin()) -> {dns:decode_error(), dns:message() | undefined, binary()} | dns:message().

decode_message(Bin) ->

    case application:get_env(erldns, catch_exceptions) of

        {ok, false} ->

            dns:decode_message(Bin);

        _ ->

            try dns:decode_message(Bin) of

                M ->

                    M

            catch

                Exception:Reason ->

                    ?LOG_ERROR(

                        "Error decoding message (module: ~p, event: ~p, data: ~p, exception: ~p, reason: ~p)",

                        [?MODULE, decode_message_error, Bin, Exception, Reason]

                    ),

                    {formerr, Reason, Bin}

            end

    end.