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%%% Copyright (c) 2019, Sunet.
%%% See LICENSE for licensing information.
%% Create an AF_UNIX socket and accept connections. On connect, spawn
%% another p11p_server process.
-module(p11p_server).
-behaviour(gen_server).
-include("p11p_rpc.hrl").
%% API.
-export([start_link/1]).
-export([reply/2, token_gone/2]).
%% Genserver callbacks.
-export([init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2,
code_change/3]).
%% Records and types.
-record(state, {
tokname :: string(),
client :: pid() | undefined,
socket :: gen_tcp:socket(),
req_in :: p11rpc_msg() | undefined,
req_out :: p11rpc_msg() | undefined,
recv_count = 0 :: non_neg_integer(), % received from app
send_count = 0 :: non_neg_integer() % sent to token
}).
%% API.
-spec start_link(gen_tcp:socket()) -> {ok, pid()} | {error, term()}.
start_link(Args) ->
gen_server:start_link(?MODULE, Args, []).
-spec reply(pid(), p11rpc_msg()) -> {ok, non_neg_integer()}.
reply(Pid, Response) ->
gen_server:call(Pid, {respond, Response}).
-spec token_gone(pid(), boolean()) -> ok.
token_gone(Pid, Hangup) ->
case process_info(Pid) of undefined -> error(bad_server_pid); _ -> nop end,
gen_server:cast(Pid, {token_gone, Hangup}).
%% Genserver callbacks.
init([Token, Socket]) ->
lager:debug("~p: p11p_server starting for ~s", [self(), Token]),
process_flag(trap_exit, true), % Need terminate/2.
gen_server:cast(self(), accept), % Invoke accept, returning a socket in state.
{ok, #state{tokname = Token, socket = Socket}}.
%% FIXME: make this a cast
handle_call({respond, Resp}, _, State = #state{send_count = Sent}) ->
N = send_response(State#state.socket, p11p_rpc:serialise(Resp), Sent),
{reply, {ok, N}, State#state{req_out = undefined,
send_count = Sent + 1}};
handle_call(Call, _, S) ->
lager:debug("~p: Unhandled call: ~p~n", [self(), Call]),
{reply, unhandled, S}.
%% Wait for new connection.
handle_cast(accept, State = #state{tokname = TokName, socket = ListenSocket}) ->
%% Blocking until client connects or timeout fires.
%% Without a timeout our supervisor cannot terminate us.
%% On timeout, just invoke ourselves again.
case gen_tcp:accept(ListenSocket, 900) of
{ok, Sock} ->
lager:debug("~p: ~p: new connection accepted", [self(), Sock]),
%% Start a new acceptor and return with new socket in state.
p11p_server_sup:start_server([TokName, ListenSocket]),
{noreply, State#state{socket = Sock}};
{error, timeout} ->
gen_server:cast(self(), accept),
{noreply, State};
{error, closed} ->
lager:debug("~p: listening socket closed", [self()]),
{stop, normal, State}
end;
handle_cast({token_gone, Hangup}, State = #state{send_count = Sent}) ->
Resp = p11p_rpc:error(State#state.req_out#p11rpc_msg.call_code,
?CKR_DEVICE_ERROR),
{ok, _} = send_response(State#state.socket, p11p_rpc:serialise(Resp), Sent),
NewState = State#state{client = undefined,
req_out = undefined,
send_count = Sent + 1},
case Hangup of
true ->
{close, NewState};
false ->
{noreply, NewState}
end;
handle_cast(Cast, State) ->
lager:debug("~p: Unhandled cast: ~p~n", [self(), Cast]),
{noreply, State}.
%% First packet from P11 client.
handle_info({tcp, Port, DataIn}, #state{tokname = TokName} = S)
when S#state.client == undefined ->
%%lager:debug("~p: received ~B octets from client on socket ~p, from new client", [self(), size(Data), Port]),
<<RPCVersion:8, Data/binary>> = DataIn,
case RPCVersion of
?RPC_VERSION ->
{noreply,
p11_app_data(
S#state{client = p11p_manager:client_for_token(TokName)},
p11p_rpc:new(),
Data)};
BadVersion ->
lager:info("~p: ~p: invalid RPC version: ~p", [self(), Port,
BadVersion]),
{stop, bad_proto, S}
end;
%% Subsequent packages from P11 client.
handle_info({tcp, _Port, DataIn}, #state{req_in = Msg} = S) ->
%%lager:debug("~p: received ~B octets from client on socket ~p, with ~B octets already in buffer", [self(), size(Data), Port, size(Msg#p11rpc_msg.buffer)]),
{noreply, p11_app_data(S, Msg, DataIn)};
handle_info({tcp_closed, Port}, S) ->
lager:debug("~p: socket ~p closed", [self(), Port]),
{stop, normal, S};
handle_info(Info, S) ->
lager:debug("~p: Unhandled info: ~p~n", [self(), Info]),
{noreply, S}.
terminate(Reason, #state{socket = Sock, tokname = TokName}) ->
ok = gen_tcp:close(Sock),
%% FIXME: tell manager, so that the client can be stopped. we
%% don't want to risk that another app (socket client) uses it
p11p_manager:server_event(server_gone, TokName),
lager:debug("~p: terminated with reason ~p", [self(), Reason]),
ignored.
code_change(_OldVersion, State, _Extra) ->
{ok, State}.
%% Private functions.
p11_app_data(#state{client = Client, recv_count = Recv} = S, MsgIn,
DataIn) ->
case p11p_rpc:parse(MsgIn, DataIn) of
{needmore, Msg} ->
S#state{req_in = Msg};
{done, Msg} ->
lager:debug("~p: -> ~s", [self(), p11p_rpc:dump(Msg)]),
{ok, _BytesSent} = p11p_client:request(Client, Msg),
S#state{req_out = Msg,
req_in = p11p_rpc:new(Msg#p11rpc_msg.buffer),
recv_count = Recv + 1}
end.
send_response(Sock, Inbuf, Sent) ->
Buf = case Sent of
0 -> <<?RPC_VERSION:8, Inbuf/binary>>;
_ -> Inbuf
end,
%%lager:debug("~p: sending ~B octets as response", [self(), size(Inbuf)]),
ok = gen_tcp:send(Sock, Buf),
{ok, size(Inbuf)}.
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