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%%%-------------------------------------------------------------------
%%% File : ejabberd_stun.erl
%%% Author : Evgeny Khramtsov <ekhramtsov@process-one.net>
%%% Purpose : STUN RFC-5766
%%% Created : 8 May 2014 by Evgeny Khramtsov <ekhramtsov@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2013-2017 ProcessOne
%%%
%%% This program is free software; you can redistribute it and/or
%%% modify it under the terms of the GNU General Public License as
%%% published by the Free Software Foundation; either version 2 of the
%%% License, or (at your option) any later version.
%%%
%%% This program is distributed in the hope that it will be useful,
%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
%%% General Public License for more details.
%%%
%%% You should have received a copy of the GNU General Public License along
%%% with this program; if not, write to the Free Software Foundation, Inc.,
%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
%%%-------------------------------------------------------------------
-module(ejabberd_stun).
-protocol({rfc, 5766}).
-protocol({xep, 176, '1.0'}).
-export([tcp_init/2, udp_init/2, udp_recv/5, start/2,
socket_type/0, listen_opt_type/1]).
-include("ejabberd.hrl").
-include("logger.hrl").
%%%===================================================================
%%% API
%%%===================================================================
tcp_init(Socket, Opts) ->
ejabberd:start_app(stun),
stun:tcp_init(Socket, prepare_turn_opts(Opts)).
udp_init(Socket, Opts) ->
ejabberd:start_app(stun),
stun:udp_init(Socket, prepare_turn_opts(Opts)).
udp_recv(Socket, Addr, Port, Packet, Opts) ->
stun:udp_recv(Socket, Addr, Port, Packet, Opts).
start(Opaque, Opts) ->
stun:start(Opaque, Opts).
socket_type() ->
raw.
%%%===================================================================
%%% Internal functions
%%%===================================================================
prepare_turn_opts(Opts) ->
UseTurn = proplists:get_bool(use_turn, Opts),
prepare_turn_opts(Opts, UseTurn).
prepare_turn_opts(Opts, _UseTurn = false) ->
Opts;
prepare_turn_opts(Opts, _UseTurn = true) ->
NumberOfMyHosts = length(?MYHOSTS),
case proplists:get_value(turn_ip, Opts) of
undefined ->
?WARNING_MSG("option 'turn_ip' is undefined, "
"more likely the TURN relay won't be working "
"properly", []);
_ ->
ok
end,
AuthFun = fun ejabberd_auth:get_password_s/2,
Shaper = proplists:get_value(shaper, Opts, none),
AuthType = proplists:get_value(auth_type, Opts, user),
Realm = case proplists:get_value(auth_realm, Opts) of
undefined when AuthType == user ->
if NumberOfMyHosts > 1 ->
?WARNING_MSG("you have several virtual "
"hosts configured, but option "
"'auth_realm' is undefined and "
"'auth_type' is set to 'user', "
"more likely the TURN relay won't "
"be working properly. Using ~s as "
"a fallback", [?MYNAME]);
true ->
ok
end,
[{auth_realm, ?MYNAME}];
_ ->
[]
end,
MaxRate = shaper:get_max_rate(Shaper),
Realm ++ [{auth_fun, AuthFun},{shaper, MaxRate} |
lists:keydelete(shaper, 1, Opts)].
listen_opt_type(use_turn) ->
fun(B) when is_boolean(B) -> B end;
listen_opt_type(turn_ip) ->
fun(S) ->
{ok, Addr} = inet_parse:ipv4_address(binary_to_list(S)),
Addr
end;
listen_opt_type(shaper) ->
fun acl:shaper_rules_validator/1;
listen_opt_type(auth_type) ->
fun(anonymous) -> anonymous;
(user) -> user
end;
listen_opt_type(auth_realm) ->
fun iolist_to_binary/1;
listen_opt_type(tls) ->
fun(B) when is_boolean(B) -> B end;
listen_opt_type(certfile) ->
fun(S) ->
ejabberd_pkix:add_certfile(S),
iolist_to_binary(S)
end;
listen_opt_type(turn_min_port) ->
fun(P) when is_integer(P), P > 0, P =< 65535 -> P end;
listen_opt_type(turn_max_port) ->
fun(P) when is_integer(P), P > 0, P =< 65535 -> P end;
listen_opt_type(turn_max_allocations) ->
fun(I) when is_integer(I), I>0 -> I;
(unlimited) -> infinity;
(infinity) -> infinity
end;
listen_opt_type(turn_max_permissions) ->
fun(I) when is_integer(I), I>0 -> I;
(unlimited) -> infinity;
(infinity) -> infinity
end;
listen_opt_type(server_name) ->
fun iolist_to_binary/1;
listen_opt_type(_) ->
[shaper, auth_type, auth_realm, tls, certfile, turn_min_port,
turn_max_port, turn_max_allocations, turn_max_permissions,
server_name].
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