Chapril/xmpp.chapril.org-ejabberd
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xmpp.chapril.org-ejabberd/src/ejabberd_local.erl

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%%%----------------------------------------------------------------------
%%% File : ejabberd_local.erl
%%% Author : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : Route local packets
%%% Created : 30 Nov 2002 by Alexey Shchepin <alexey@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2010 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., 59 Temple Place, Suite 330, Boston, MA
%%% 02111-1307 USA
%%%
%%%----------------------------------------------------------------------
-module(ejabberd_local).
-author('alexey@process-one.net').
-behaviour(gen_server).
%% API
-export([start_link/0]).
-export([route/3,
route_iq/4,
process_iq_reply/3,
register_iq_handler/4,
register_iq_handler/5,
register_iq_response_handler/4,
unregister_iq_handler/2,
unregister_iq_response_handler/2,
refresh_iq_handlers/0,
bounce_resource_packet/3
]).
%% gen_server callbacks
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-include_lib("exmpp/include/exmpp.hrl").
-include("ejabberd.hrl").
-record(state, {}).
-record(iq_response, {id, module, function, timer}).
-define(IQTABLE, local_iqtable).
%% This value is used in SIP and Megaco for a transaction lifetime.
-define(IQ_TIMEOUT, 32000).
% These are the namespace already declared by the stream opening. This is
% used at serialization time.
-define(DEFAULT_NS, ?NS_JABBER_CLIENT).
-define(PREFIXED_NS, [
{?NS_XMPP, ?NS_XMPP_pfx}, {?NS_DIALBACK, ?NS_DIALBACK_pfx}
]).
%%====================================================================
%% API
%%====================================================================
%%--------------------------------------------------------------------
%% Function: start_link() -> {ok,Pid} | ignore | {error,Error}
%% Description: Starts the server
%%--------------------------------------------------------------------
start_link() ->
gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
process_iq(From, To, Packet) ->
case exmpp_iq:xmlel_to_iq(Packet) of
#iq{kind = request, ns = XMLNS} = IQ_Rec ->
Host = exmpp_jid:prep_domain(To),
case ets:lookup(?IQTABLE, {XMLNS, Host}) of
[{_, Module, Function}] ->
ResIQ = Module:Function(From, To, IQ_Rec),
if
ResIQ /= ignore ->
Reply = exmpp_iq:iq_to_xmlel(ResIQ, To, From),
ejabberd_router:route(To, From, Reply);
true ->
ok
end;
[{_, Module, Function, Opts}] ->
gen_iq_handler:handle(Host, Module, Function, Opts,
From, To, IQ_Rec);
[] ->
Err = exmpp_iq:error(Packet, 'feature-not-implemented'),
ejabberd_router:route(To, From, Err)
end;
#iq{kind = response} = IQReply ->
%%IQReply = jlib:iq_query_or_response_info(IQ_Rec),
process_iq_reply(From, To, IQReply);
_ ->
Err = exmpp_iq:error(Packet, 'bad-request'),
ejabberd_router:route(To, From, Err),
ok
end.
process_iq_reply(From, To, #iq{id = ID} = IQ) ->
case get_iq_callback(ID) of
{ok, undefined, Function} ->
Function(IQ),
ok;
{ok, Module, Function} ->
Module:Function(From, To, IQ),
ok;
_ ->
nothing
end.
%% #xmlelement{} used for retro-compatibility
route(FromOld, ToOld, #xmlelement{} = PacketOld) ->
catch throw(for_stacktrace), % To have a stacktrace.
io:format("~nLOCAL: old #xmlelement:~n~p~n~p~n~n",
[PacketOld, erlang:get_stacktrace()]),
% XXX OLD FORMAT: From, To, Packet.
From = jlib:from_old_jid(FromOld),
To = jlib:from_old_jid(ToOld),
Packet = exmpp_xml:xmlelement_to_xmlel(PacketOld, [?NS_JABBER_CLIENT],
[{?NS_XMPP, ?NS_XMPP_pfx}]),
route(From, To, Packet);
route(From, To, Packet) ->
case catch do_route(From, To, Packet) of
{'EXIT', Reason} ->
?ERROR_MSG("~p~nwhen processing: ~p",
[Reason, {From, To, Packet}]);
_ ->
ok
end.
route_iq(From, To, #iq{type = Type} = IQ, F) when is_function(F) ->
Packet = if Type == set; Type == get ->
ID = list_to_binary(ejabberd_router:make_id()),
Host = exmpp_jid:prep_domain(From),
register_iq_response_handler(Host, ID, undefined, F),
exmpp_iq:iq_to_xmlel(IQ#iq{id = ID});
true ->
exmpp_iq:iq_to_xmlel(IQ)
end,
ejabberd_router:route(From, To, Packet).
register_iq_response_handler(_Host, ID, Module, Function) ->
TRef = erlang:start_timer(?IQ_TIMEOUT, ejabberd_local, ID),
ets:insert(iq_response, #iq_response{id = ID,
module = Module,
function = Function,
timer = TRef}).
register_iq_handler(Host, XMLNS, Module, Fun) ->
ejabberd_local ! {register_iq_handler, Host, XMLNS, Module, Fun}.
register_iq_handler(Host, XMLNS, Module, Fun, Opts) ->
ejabberd_local ! {register_iq_handler, Host, XMLNS, Module, Fun, Opts}.
unregister_iq_response_handler(_Host, ID) ->
catch get_iq_callback(ID),
ok.
unregister_iq_handler(Host, XMLNS) ->
ejabberd_local ! {unregister_iq_handler, Host, XMLNS}.
refresh_iq_handlers() ->
ejabberd_local ! refresh_iq_handlers.
bounce_resource_packet(From, To, Packet) ->
Err = exmpp_stanza:reply_with_error(Packet, 'item-not-found'),
ejabberd_router:route(To, From, Err),
stop.
%%====================================================================
%% gen_server callbacks
%%====================================================================
%%--------------------------------------------------------------------
%% Function: init(Args) -> {ok, State} |
%% {ok, State, Timeout} |
%% ignore |
%% {stop, Reason}
%% Description: Initiates the server
%%--------------------------------------------------------------------
init([]) ->
lists:foreach(
fun(Host) ->
ejabberd_router:register_route(Host, {apply, ?MODULE, route}),
ejabberd_hooks:add(local_send_to_resource_hook, list_to_binary(Host),
?MODULE, bounce_resource_packet, 100)
end, ?MYHOSTS),
catch ets:new(?IQTABLE, [named_table, public]),
mnesia:delete_table(iq_response),
catch ets:new(iq_response, [named_table, public,
{keypos, #iq_response.id}]),
{ok, #state{}}.
%%--------------------------------------------------------------------
%% Function: %% handle_call(Request, From, State) -> {reply, Reply, State} |
%% {reply, Reply, State, Timeout} |
%% {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, Reply, State} |
%% {stop, Reason, State}
%% Description: Handling call messages
%%--------------------------------------------------------------------
handle_call(_Request, _From, State) ->
Reply = ok,
{reply, Reply, State}.
%%--------------------------------------------------------------------
%% Function: handle_cast(Msg, State) -> {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, State}
%% Description: Handling cast messages
%%--------------------------------------------------------------------
handle_cast(_Msg, State) ->
{noreply, State}.
%%--------------------------------------------------------------------
%% Function: handle_info(Info, State) -> {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, State}
%% Description: Handling all non call/cast messages
%%--------------------------------------------------------------------
%% #xmlelement{} used for retro-compatibility
handle_info({route, FromOld, ToOld, #xmlelement{} = PacketOld}, State) ->
catch throw(for_stacktrace), % To have a stacktrace.
io:format("~nLOCAL: old #xmlelement:~n~p~n~p~n~n",
[PacketOld, erlang:get_stacktrace()]),
% XXX OLD FORMAT: From, To, Packet.
From = jlib:from_old_jid(FromOld),
To = jlib:from_old_jid(ToOld),
Packet = exmpp_xml:xmlelement_to_xmlel(PacketOld, [?NS_JABBER_CLIENT],
[{?NS_XMPP, ?NS_XMPP_pfx}]),
handle_info({route, From, To, Packet}, State);
handle_info({route, From, To, Packet}, State) ->
case catch do_route(From, To, Packet) of
{'EXIT', Reason} ->
?ERROR_MSG("~p~nwhen processing: ~p",
[Reason, {From, To, Packet}]);
_ ->
ok
end,
{noreply, State};
handle_info({register_iq_handler, Host, XMLNS, Module, Function}, State) ->
ets:insert(?IQTABLE, {{XMLNS, Host}, Module, Function}),
catch mod_disco:register_feature(Host, XMLNS),
{noreply, State};
handle_info({register_iq_handler, Host, XMLNS, Module, Function, Opts}, State) ->
ets:insert(?IQTABLE, {{XMLNS, Host}, Module, Function, Opts}),
catch mod_disco:register_feature(Host, XMLNS),
{noreply, State};
handle_info({unregister_iq_handler, Host, XMLNS}, State) ->
case ets:lookup(?IQTABLE, {XMLNS, Host}) of
[{_, Module, Function, Opts}] ->
gen_iq_handler:stop_iq_handler(Module, Function, Opts);
_ ->
ok
end,
ets:delete(?IQTABLE, {XMLNS, Host}),
catch mod_disco:unregister_feature(Host, XMLNS),
{noreply, State};
handle_info(refresh_iq_handlers, State) ->
lists:foreach(
fun(T) ->
case T of
{{XMLNS, Host}, _Module, _Function, _Opts} ->
catch mod_disco:register_feature(Host, XMLNS);
{{XMLNS, Host}, _Module, _Function} ->
catch mod_disco:register_feature(Host, XMLNS);
_ ->
ok
end
end, ets:tab2list(?IQTABLE)),
{noreply, State};
handle_info({timeout, _TRef, ID}, State) ->
spawn(fun() -> process_iq_timeout(ID) end),
{noreply, State};
handle_info(_Info, State) ->
{noreply, State}.
%%--------------------------------------------------------------------
%% Function: terminate(Reason, State) -> void()
%% Description: This function is called by a gen_server when it is about to
%% terminate. It should be the opposite of Module:init/1 and do any necessary
%% cleaning up. When it returns, the gen_server terminates with Reason.
%% The return value is ignored.
%%--------------------------------------------------------------------
terminate(_Reason, _State) ->
ok.
%%--------------------------------------------------------------------
%% Func: code_change(OldVsn, State, Extra) -> {ok, NewState}
%% Description: Convert process state when code is changed
%%--------------------------------------------------------------------
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%%--------------------------------------------------------------------
%%% Internal functions
%%--------------------------------------------------------------------
do_route(From, To, Packet) ->
?DEBUG("local route~n\tfrom ~p~n\tto ~p~n\tpacket ~P~n",
[From, To, Packet, 8]),
LNode = exmpp_jid:prep_node(To),
LResource = exmpp_jid:prep_resource(To),
if
LNode /= undefined ->
ejabberd_sm:route(From, To, Packet);
LResource == undefined ->
case Packet of
_ when ?IS_IQ(Packet) ->
process_iq(From, To, Packet);
_ when ?IS_MESSAGE(Packet) ->
ok;
_ when ?IS_PRESENCE(Packet) ->
ok;
_ ->
ok
end;
true ->
case exmpp_stanza:get_type(Packet) of
<<"error">> -> ok;
<<"result">> -> ok;
_ ->
ejabberd_hooks:run(local_send_to_resource_hook,
exmpp_jid:prep_domain(To),
[From, To, Packet])
end
end.
get_iq_callback(ID) ->
case ets:lookup(iq_response, ID) of
[#iq_response{module = Module, timer = TRef,
function = Function}] ->
cancel_timer(TRef),
ets:delete(iq_response, ID),
{ok, Module, Function};
_ ->
error
end.
process_iq_timeout(ID) ->
case get_iq_callback(ID) of
{ok, undefined, Function} ->
Function(timeout);
_ ->
ok
end.
cancel_timer(TRef) ->
case erlang:cancel_timer(TRef) of
false ->
receive
{timeout, TRef, _} ->
ok
after 0 ->
ok
end;
_ ->
ok
end.
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