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%% A remote spawns an Erlang port running the 'remote' program from
%% p11-kit.
%% Receive p11 requests from p11p_server, forward them to the remote,
%% wait for a reply. If a reply is received within a timeout period,
%% forward the reply to the requesting p11p_server. If the request
%% times out, inform the remote manager (our parent).
%% TODO: "remote" is not a great name and we shouldn't just inherit it
%% from p11p-kit
-module(p11p_remote).
-behaviour(gen_server).
%% API.
-export([start_link/3]).
-export([send/3]).
%% Genserver callbacks.
-export([init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2,
code_change/3]).
%% Records and types.
-record(state, {
port :: port(),
replyto :: pid() | undefined,
timer :: reference() | undefined,
token :: string()
}).
-define(P11KITREMOTE_PATH, "/home/linus/usr/libexec/p11-kit/p11-kit-remote").
%% API.
-spec start_link(atom(), string(), string()) -> {ok, pid()} | {error, term()}.
start_link(ServName, TokName, ModPath) ->
lager:info("~p: p11p_remote starting for ~s", [ServName, ModPath]),
gen_server:start_link({local, ServName}, ?MODULE, [TokName, ModPath], []).
-spec send(pid(), pid(), iodata()) -> ok.
send(From, Remote, Data) ->
gen_server:cast(Remote, {send, From, Data}).
%% Genserver callbacks.
init([TokName, ModPath]) ->
Port = open_port({spawn_executable, ?P11KITREMOTE_PATH},
[stream, exit_status, {args, [ModPath, "-v"]}]),
lager:debug("~s: New port: ~p", [?P11KITREMOTE_PATH, Port]),
{ok, #state{port = Port, token = TokName}}.
handle_call(Request, _From, State) ->
lager:debug("Unhandled call: ~p~n", [Request]),
{reply, unhandled, State}.
handle_cast({send, From, Data}, #state{port = Port} = State) ->
lager:debug("~p: sending ~B octets to remote ~p",
[self(), length(binary_to_list(Data)), Port]),
port_command(Port, Data),
%% TODO: move timing to server, measuring time for a p11 response
%% rather than this
Timer = erlang:start_timer(3000, self(), Port),
NewState = State#state{replyto = From, timer = Timer},
{noreply, NewState};
handle_cast(Request, State) ->
lager:debug("Unhandled cast: ~p~n", [Request]),
{noreply, State}.
handle_info({Port, {data, Data}}, #state{replyto = Pid, timer = Timer} = State) ->
if
Port == State#state.port ->
erlang:cancel_timer(Timer, [{async, true}, {info, false}]),
p11p_server:reply(Pid, Data);
true ->
lager:debug("~p: data from unknown port ~p", [self(), Port])
end,
{noreply, State};
handle_info({timeout, Timer, Port}, #state{token = TokName} = State) ->
NewState =
if
Port == State#state.port andalso Timer == State#state.timer ->
p11p_remote_manager:timeout(TokName),
State#state{timer = undefined};
true ->
lager:debug("~p: unknown timer ~p fired for port ~p",
[self(), Timer, Port]),
State
end,
{noreply, NewState};
handle_info(Info, State) ->
lager:debug("Unhandled info: ~p~n", [Info]),
{noreply, State}.
terminate(_Reason, _State) ->
ok.
code_change(_OldVersion, State, _Extra) ->
{ok, State}.
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