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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/2]).
%% 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(ValidateRR, SupportRRs) ->
gen_server:call(?MODULE, {validate, [ValidateRR, SupportRRs]}).
-record(state, {port :: port()}).
init(Program) ->
lager:debug("starting dnssec service"),
Port = create_port(Program, []), % TODO: Pass path to dir with trust root.
{ok, #state{port = Port}}.
handle_call(stop, _From, State) ->
lager:debug("dnssec stop request received"),
stop_port(State);
handle_call({validate, [ValidateRR, SupportRRs]}, _From, State) ->
lager:debug("dnssec validate incoming request: ~p", [ValidateRR]),
case State#state.port of
undefined ->
{error, noport};
Port when is_port(Port) ->
S = list_to_binary(SupportRRs),
Port ! {self(), {command, <<ValidateRR/binary, S/binary>>}},
receive
{Port, {data, Response}} ->
lager:debug("received response from dnssec port: ~p",
[Response]),
case Response of
"valid" ->
{reply, ok, State};
Err ->
{reply, {error, Err}, 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
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.
%%%%%%%%%%%%%%%%%%%%
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.
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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