%%%---------------------------------------------------------------------- %%% File : ejabberd_service.erl %%% Author : Alexey Shchepin %%% Purpose : %%% Created : 6 Dec 2002 by Alexey Shchepin %%% Id : $Id$ %%%---------------------------------------------------------------------- -module(ejabberd_service). -author('alexey@sevcom.net'). -vsn('$Revision$ '). -behaviour(gen_fsm). %% External exports -export([start_link/2, receiver/2, send_text/2, send_element/2]). %% 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, receiver, streamid, host, password}). %-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_link(SockData, Opts) -> gen_fsm:start_link(ejabberd_service, [SockData, Opts], ?FSMOPTS). %%%---------------------------------------------------------------------- %%% Callback functions from gen_fsm %%%---------------------------------------------------------------------- %%---------------------------------------------------------------------- %% Func: init/1 %% Returns: {ok, StateName, StateData} | %% {ok, StateName, StateData, Timeout} | %% ignore | %% {stop, StopReason} %%---------------------------------------------------------------------- init([{SockMod, Socket}, Opts]) -> {Host, Password} = 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, ReceiverPid = spawn(?MODULE, receiver, [Socket, self()]), {ok, wait_for_stream, #state{socket = Socket, receiver = ReceiverPid, streamid = new_id(), host = Host, password = Password }}. %%---------------------------------------------------------------------- %% Func: StateName/2 %% Returns: {next_state, NextStateName, NextStateData} | %% {next_state, NextStateName, NextStateData, Timeout} | %% {stop, Reason, NewStateData} %%---------------------------------------------------------------------- %state_name(Event, StateData) -> % {next_state, state_name, StateData}. wait_for_stream({xmlstreamstart, Name, Attrs}, StateData) -> % TODO case xml:get_attr_s("xmlns", Attrs) of "jabber:component:accept" -> Header = io_lib:format(?STREAM_HEADER, [StateData#state.streamid, ?MYNAME]), send_text(StateData#state.socket, Header), {next_state, wait_for_handshake, StateData}; _ -> send_text(StateData#state.socket, ?INVALID_HEADER_ERR), {stop, normal, StateData} end; wait_for_stream({xmlstreamerror, _}, StateData) -> Header = io_lib:format(?STREAM_HEADER, ["none", ?MYNAME]), send_text(StateData#state.socket, 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#state.socket, ""), ejabberd_router:register_local_route(StateData#state.host), {next_state, stream_established, StateData}; _ -> send_text(StateData#state.socket, ?INVALID_HEADER_ERR), {stop, normal, StateData} end; _ -> {next_state, wait_for_key, StateData} end; wait_for_handshake({xmlstreamend, Name}, StateData) -> {stop, normal, StateData}; wait_for_handshake({xmlstreamerror, _}, StateData) -> send_text(StateData#state.socket, ?INVALID_XML_ERR ++ ?STREAM_TRAILER), {stop, normal, StateData}; wait_for_handshake(closed, StateData) -> {stop, normal, StateData}. stream_established({xmlstreamelement, El}, StateData) -> {xmlelement, Name, Attrs, Els} = El, From = xml:get_attr_s("from", Attrs), FromJID1 = jlib:string_to_jid(From), FromJID = case FromJID1 of {Node, Server, Resource} -> if Server == StateData#state.host -> FromJID1; true -> error end; _ -> error 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, El); true -> Err = jlib:make_error_reply(El, ?ERR_BAD_REQUEST), send_element(StateData#state.socket, Err), error end, {next_state, stream_established, StateData}; stream_established({xmlstreamend, Name}, StateData) -> % TODO {stop, normal, StateData}; stream_established({xmlstreamerror, _}, StateData) -> send_text(StateData#state.socket, ?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#state.socket, Text), {next_state, StateName, StateData}; handle_info({send_element, El}, StateName, StateData) -> send_element(StateData#state.socket, El), {next_state, StateName, StateData}; handle_info({route, From, To, Packet}, StateName, StateData) -> {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#state.socket, Text), {next_state, StateName, StateData}. %%---------------------------------------------------------------------- %% Func: terminate/3 %% Purpose: Shutdown the fsm %% Returns: any %%---------------------------------------------------------------------- terminate(Reason, StateName, StateData) -> case StateName of stream_established -> ejabberd_router:unregister_local_route(StateData#state.host); _ -> ok end, gen_tcp:close(StateData#state.socket), ok. %%%---------------------------------------------------------------------- %%% Internal functions %%%---------------------------------------------------------------------- receiver(Socket, C2SPid) -> XMLStreamPid = xml_stream:start(C2SPid), receiver(Socket, C2SPid, XMLStreamPid). receiver(Socket, C2SPid, XMLStreamPid) -> case gen_tcp:recv(Socket, 0) of {ok, Text} -> xml_stream:send_text(XMLStreamPid, Text), receiver(Socket, C2SPid, XMLStreamPid); {error, Reason} -> exit(XMLStreamPid, closed), gen_fsm:send_event(C2SPid, closed), ok end. send_text(Socket, Text) -> gen_tcp:send(Socket,Text). send_element(Socket, El) -> send_text(Socket, xml:element_to_string(El)). new_id() -> randoms:get_string().