%%%---------------------------------------------------------------------- %%% File : ejabberd_service.erl %%% Author : Alexey Shchepin %%% Purpose : External component management (XEP-0114) %%% Created : 6 Dec 2002 by Alexey Shchepin %%% %%% %%% ejabberd, Copyright (C) 2002-2008 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_service). -author('alexey@process-one.net'). -behaviour(gen_fsm). %% External exports -export([start/2, start_link/2, send_text/2, send_element/2, socket_type/0]). %% gen_fsm callbacks -export([init/1, wait_for_stream/2, wait_for_handshake/2, stream_established/2, handle_event/3, handle_sync_event/4, code_change/4, handle_info/3, terminate/3]). -include("ejabberd.hrl"). -include("jlib.hrl"). -record(state, {socket, sockmod, streamid, hosts, password, access, check_from}). %-define(DBGFSM, true). -ifdef(DBGFSM). -define(FSMOPTS, [{debug, [trace]}]). -else. -define(FSMOPTS, []). -endif. -define(STREAM_HEADER, "" "" ). -define(STREAM_TRAILER, ""). -define(INVALID_HEADER_ERR, "" "Invalid Stream Header" "" ). -define(INVALID_HANDSHAKE_ERR, "Invalid Handshake" "" ). -define(INVALID_XML_ERR, xml:element_to_string(?SERR_XML_NOT_WELL_FORMED)). -define(INVALID_NS_ERR, xml:element_to_string(?SERR_INVALID_NAMESPACE)). %%%---------------------------------------------------------------------- %%% API %%%---------------------------------------------------------------------- start(SockData, Opts) -> supervisor:start_child(ejabberd_service_sup, [SockData, Opts]). start_link(SockData, Opts) -> gen_fsm:start_link(ejabberd_service, [SockData, Opts], ?FSMOPTS). socket_type() -> xml_stream. %%%---------------------------------------------------------------------- %%% Callback functions from gen_fsm %%%---------------------------------------------------------------------- %%---------------------------------------------------------------------- %% Func: init/1 %% Returns: {ok, StateName, StateData} | %% {ok, StateName, StateData, Timeout} | %% ignore | %% {stop, StopReason} %%---------------------------------------------------------------------- init([{SockMod, Socket}, Opts]) -> ?INFO_MSG("(~w) External service connected", [Socket]), Access = case lists:keysearch(access, 1, Opts) of {value, {_, A}} -> A; _ -> all end, {Hosts, Password} = case lists:keysearch(hosts, 1, Opts) of {value, {_, Hs, HOpts}} -> case lists:keysearch(password, 1, HOpts) of {value, {_, P}} -> {Hs, P}; _ -> % TODO: generate error false end; _ -> case lists:keysearch(host, 1, Opts) of {value, {_, H, HOpts}} -> case lists:keysearch(password, 1, HOpts) of {value, {_, P}} -> {[H], P}; _ -> % TODO: generate error false end; _ -> % TODO: generate error false end end, Shaper = case lists:keysearch(shaper_rule, 1, Opts) of {value, {_, S}} -> S; _ -> none end, CheckFrom = case lists:keysearch(service_check_from, 1, Opts) of {value, {_, CF}} -> CF; _ -> true end, SockMod:change_shaper(Socket, Shaper), {ok, wait_for_stream, #state{socket = Socket, sockmod = SockMod, streamid = new_id(), hosts = Hosts, password = Password, access = Access, check_from = CheckFrom }}. %%---------------------------------------------------------------------- %% Func: StateName/2 %% Returns: {next_state, NextStateName, NextStateData} | %% {next_state, NextStateName, NextStateData, Timeout} | %% {stop, Reason, NewStateData} %%---------------------------------------------------------------------- wait_for_stream({xmlstreamstart, _Name, Attrs}, StateData) -> case xml:get_attr_s("xmlns", Attrs) of "jabber:component:accept" -> %% Note: XEP-0114 requires to check that destination is a Jabber %% component served by this Jabber server. %% However several transports don't respect that, %% so ejabberd doesn't check 'to' attribute (EJAB-717) To = xml:get_attr_s("to", Attrs), Header = io_lib:format(?STREAM_HEADER, [StateData#state.streamid, xml:crypt(To)]), send_text(StateData, Header), {next_state, wait_for_handshake, StateData}; _ -> send_text(StateData, ?INVALID_HEADER_ERR), {stop, normal, StateData} end; wait_for_stream({xmlstreamerror, _}, StateData) -> Header = io_lib:format(?STREAM_HEADER, ["none", ?MYNAME]), send_text(StateData, Header ++ ?INVALID_XML_ERR ++ ?STREAM_TRAILER), {stop, normal, StateData}; wait_for_stream(closed, StateData) -> {stop, normal, StateData}. wait_for_handshake({xmlstreamelement, El}, StateData) -> {xmlelement, Name, _Attrs, Els} = El, case {Name, xml:get_cdata(Els)} of {"handshake", Digest} -> case sha:sha(StateData#state.streamid ++ StateData#state.password) of Digest -> send_text(StateData, ""), lists:foreach( fun(H) -> ejabberd_router:register_route(H), ?INFO_MSG("Route registered for service ~p~n", [H]) end, StateData#state.hosts), {next_state, stream_established, StateData}; _ -> send_text(StateData, ?INVALID_HANDSHAKE_ERR), {stop, normal, StateData} end; _ -> {next_state, wait_for_handshake, StateData} end; wait_for_handshake({xmlstreamend, _Name}, StateData) -> {stop, normal, StateData}; wait_for_handshake({xmlstreamerror, _}, StateData) -> send_text(StateData, ?INVALID_XML_ERR ++ ?STREAM_TRAILER), {stop, normal, StateData}; wait_for_handshake(closed, StateData) -> {stop, normal, StateData}. stream_established({xmlstreamelement, El}, StateData) -> NewEl = jlib:remove_attr("xmlns", El), {xmlelement, Name, Attrs, _Els} = NewEl, From = xml:get_attr_s("from", Attrs), FromJID = case StateData#state.check_from of %% If the admin does not want to check the from field %% when accept packets from any address. %% In this case, the component can send packet of %% behalf of the server users. false -> jlib:string_to_jid(From); %% The default is the standard behaviour in XEP-0114 _ -> FromJID1 = jlib:string_to_jid(From), case FromJID1 of #jid{lserver = Server} -> case lists:member(Server, StateData#state.hosts) of true -> FromJID1; false -> error end; _ -> error end end, To = xml:get_attr_s("to", Attrs), ToJID = case To of "" -> error; _ -> jlib:string_to_jid(To) end, if ((Name == "iq") or (Name == "message") or (Name == "presence")) and (ToJID /= error) and (FromJID /= error) -> ejabberd_router:route(FromJID, ToJID, NewEl); true -> Err = jlib:make_error_reply(NewEl, ?ERR_BAD_REQUEST), send_element(StateData, Err), error end, {next_state, stream_established, StateData}; stream_established({xmlstreamend, _Name}, StateData) -> % TODO {stop, normal, StateData}; stream_established({xmlstreamerror, _}, StateData) -> send_text(StateData, ?INVALID_XML_ERR ++ ?STREAM_TRAILER), {stop, normal, StateData}; stream_established(closed, StateData) -> % TODO {stop, normal, StateData}. %%---------------------------------------------------------------------- %% Func: StateName/3 %% Returns: {next_state, NextStateName, NextStateData} | %% {next_state, NextStateName, NextStateData, Timeout} | %% {reply, Reply, NextStateName, NextStateData} | %% {reply, Reply, NextStateName, NextStateData, Timeout} | %% {stop, Reason, NewStateData} | %% {stop, Reason, Reply, NewStateData} %%---------------------------------------------------------------------- %state_name(Event, From, StateData) -> % Reply = ok, % {reply, Reply, state_name, StateData}. %%---------------------------------------------------------------------- %% Func: handle_event/3 %% Returns: {next_state, NextStateName, NextStateData} | %% {next_state, NextStateName, NextStateData, Timeout} | %% {stop, Reason, NewStateData} %%---------------------------------------------------------------------- handle_event(_Event, StateName, StateData) -> {next_state, StateName, StateData}. %%---------------------------------------------------------------------- %% Func: handle_sync_event/4 %% Returns: {next_state, NextStateName, NextStateData} | %% {next_state, NextStateName, NextStateData, Timeout} | %% {reply, Reply, NextStateName, NextStateData} | %% {reply, Reply, NextStateName, NextStateData, Timeout} | %% {stop, Reason, NewStateData} | %% {stop, Reason, Reply, NewStateData} %%---------------------------------------------------------------------- handle_sync_event(_Event, _From, StateName, StateData) -> Reply = ok, {reply, Reply, StateName, StateData}. code_change(_OldVsn, StateName, StateData, _Extra) -> {ok, StateName, StateData}. %%---------------------------------------------------------------------- %% Func: handle_info/3 %% Returns: {next_state, NextStateName, NextStateData} | %% {next_state, NextStateName, NextStateData, Timeout} | %% {stop, Reason, NewStateData} %%---------------------------------------------------------------------- handle_info({send_text, Text}, StateName, StateData) -> send_text(StateData, Text), {next_state, StateName, StateData}; handle_info({send_element, El}, StateName, StateData) -> send_element(StateData, El), {next_state, StateName, StateData}; handle_info({route, From, To, Packet}, StateName, StateData) -> case acl:match_rule(global, StateData#state.access, From) of allow -> {xmlelement, Name, Attrs, Els} = Packet, Attrs2 = jlib:replace_from_to_attrs(jlib:jid_to_string(From), jlib:jid_to_string(To), Attrs), Text = xml:element_to_string({xmlelement, Name, Attrs2, Els}), send_text(StateData, Text); deny -> Err = jlib:make_error_reply(Packet, ?ERR_NOT_ALLOWED), ejabberd_router:route(To, From, Err) end, {next_state, StateName, StateData}. %%---------------------------------------------------------------------- %% Func: terminate/3 %% Purpose: Shutdown the fsm %% Returns: any %%---------------------------------------------------------------------- terminate(Reason, StateName, StateData) -> ?INFO_MSG("terminated: ~p", [Reason]), case StateName of stream_established -> lists:foreach( fun(H) -> ejabberd_router:unregister_route(H) end, StateData#state.hosts); _ -> ok end, (StateData#state.sockmod):close(StateData#state.socket), ok. %%%---------------------------------------------------------------------- %%% Internal functions %%%---------------------------------------------------------------------- send_text(StateData, Text) -> (StateData#state.sockmod):send(StateData#state.socket, Text). send_element(StateData, El) -> send_text(StateData, xml:element_to_string(El)). new_id() -> randoms:get_string().