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%%% Copyright (c) 2016, NORDUnet A/S.
%%% See LICENSE for licensing information.
-module(dnssecport).
-behaviour(gen_server).
-export([start_link/0, stop/0]).
-export([validate/1]).
%% gen_server callbacks.
-export([init/1, handle_call/3, terminate/2, handle_cast/2, handle_info/2,
code_change/3]).
-include_lib("eunit/include/eunit.hrl").
start_link() ->
gen_server:start_link({local, ?MODULE}, ?MODULE,
[code:priv_dir(catlfish) ++ "/dnssecport"], []).
stop() ->
gen_server:call(?MODULE, stop).
validate(Data) ->
gen_server:call(?MODULE, {validate, Data}).
-record(state, {port :: port()}).
-spec trust_anchors() -> string().
trust_anchors() ->
case application:get_env(catlfish, trust_anchors_file) of
{ok, Filename} -> Filename;
undefined -> []
end.
init(Program) ->
lager:debug("starting dnssec service"),
Port = create_port(Program, [trust_anchors()]),
{ok, #state{port = Port}}.
decode_response(Response) ->
<<Status:16/integer, RRSet/binary>> = Response,
{ok, Status, dns:decode_rrset(RRSet)}.
-define(DNSSEC_VALIDATION_TIME_SKEW, 30).
handle_call(stop, _From, State) ->
lager:debug("dnssec stop request received"),
stop_port(State);
handle_call({validate, RRset}, _From, State) ->
case dns:validate(RRset) of
{valid, ValidationTime} ->
case State#state.port of
undefined ->
{reply, {error, noport}, State};
Port when is_port(Port) ->
portcommand(RRset, ValidationTime,
?DNSSEC_VALIDATION_TIME_SKEW, State)
end;
{invalid, Reason} ->
{reply, {invalid, Reason}, State}
end.
handle_info(_Info, State) ->
{noreply, State}.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
handle_cast(_Request, State) ->
{noreply, State}.
terminate(Reason, _State) ->
lager:info("dnssec port terminating: ~p", [Reason]),
ok.
%%%%%%%%%%%%%%%%%%%%
-spec portcommand(binary(), integer(), integer(), #state{}) ->
{stop, portexit|timeout, #state{}} |
{reply, tuple(), #state{}}.
portcommand(Data, ValidationTime, Skew, State) ->
Port = State#state.port,
Port ! {self(), {command,
<<ValidationTime:32/integer,
Skew:32/integer,
Data/binary>>}},
receive
{Port, {data, Response}} ->
case decode_response(list_to_binary(Response)) of
{ok, 400, RRset} ->
C14N_RRset = dns:canonicalize(RRset),
{reply, {valid, dns:encode_rrset(C14N_RRset)}, State};
{ok, Code, _} ->
{reply, {invalid, Code}, State}
end;
{Port, {exit_status, ExitStatus}} ->
lager:error("dnssec port ~p exiting with status ~p",
[Port, ExitStatus]),
{stop, portexit, State#state{port = undefined}}
after
3000 ->
lager:error("dnssec port timeout"),
{stop, timeout, State}
end.
create_port(Program, Args) ->
open_port({spawn_executable, Program},
[{args, Args},
exit_status, % Let us know if process dies.
{packet, 4}]).
stop_port(State) ->
Port = State#state.port,
Port ! {self(), close},
receive
{Port, closed} ->
{stop, closed, State#state{port = undefined}};
{Port, Msg} ->
lager:debug("message received from dying port: ~p", [Msg]),
{stop, unknown, State#state{port = undefined}}
after
2000 ->
lager:error("dnssec port ~p refuses to die", [Port]),
{stop, timeout, State}
end.
%%%%%%%%%%%%%%%%%%%%
%% Unit tests.
-define(TA_FILE, "test/testdata/dnssec/trust_anchors").
-define(REQ1_FILE, "test/testdata/dnssec/testrrsets/req-basic").
-define(REQ2_FILE, "test/testdata/dnssec/testrrsets/req-lowttl").
start_test_port(Args) ->
create_port("priv/dnssecport", Args).
stop_test_port(Port) ->
{stop, closed, _State} = stop_port(#state{port = Port}),
ok.
read_submission_from_file(Filename) ->
{ok, Data} = file:read_file(Filename),
Data.
read_dec_enc_test_() ->
DecodedRRset = dns:decode_rrset(read_submission_from_file(?REQ1_FILE)),
{ok, FileContent} = file:read_file(?REQ1_FILE),
[?_assertEqual(FileContent, dns:encode_rrset(DecodedRRset))].
%% TODO: These tests are a bit lame. Room for improvement!
full_test_() ->
{setup,
fun() ->
start_test_port([?TA_FILE]) end,
fun(Port) ->
stop_test_port(Port) end,
fun(Port) ->
R1 = handle_call({validate, read_submission_from_file(?REQ1_FILE)},
self(), #state{port = Port}),
R2 = handle_call({validate, read_submission_from_file(?REQ2_FILE)},
self(), #state{port = Port}),
{reply, {valid, ChainBin}, _} = R2,
{DS, _} = dns:decode_rr(ChainBin),
[
?_assertMatch({reply, {valid, _}, _State}, R1),
?_assertMatch({reply, {valid, _}, _State}, R2),
?_assertMatch({rr, _Name, _Type, _Class, 3600, _RDATA}, DS)
] end
}.
no_trust_anchors_test_() ->
{setup,
fun() -> start_test_port([]) end,
fun(Port) -> stop_test_port(Port) end,
fun(Port) ->
R = handle_call({validate, read_submission_from_file(?REQ1_FILE)},
self(), #state{port = Port}),
[?_assertMatch({reply, {invalid, 401}, _}, R)] end}.
%% start_test_port(TestType) ->
%% Port = create_port("priv/dnssecport", ["--testmode", atom_to_list(TestType)]),
%% ?debugFmt("Port: ~p", [Port]),
%% Port.
%% stop_test_port(Port) ->
%% {stop, closed, _State} = stop_port(#state{port = Port}),
%% ok.
%% err_test_() ->
%% {setup,
%% fun() -> start_test_port(err) end,
%% fun(Port) -> stop_test_port(Port) end,
%% fun(Port) ->
%% R = handle_call({validate, [<<"invalid-DS">>, []]},
%% self(), #state{port = Port}),
%% [
%% ?_assertMatch({reply, {error, "err"}, _State}, R)
%% ]
%% end}.
%% ok_test_() ->
%% {setup,
%% fun() -> start_test_port(ok) end,
%% fun(Port) -> stop_test_port(Port) end,
%% fun(Port) ->
%% R = handle_call({validate, [<<"invalid-DS">>, []]},
%% self(), #state{port = Port}),
%% [
%% ?_assertMatch({reply, ok, _State}, R)
%% ]
%% end}.
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