%%%---------------------------------------------------------------------- %%% File : ejabberd_s2s_in.erl %%% Author : Alexey Shchepin %%% Purpose : %%% Created : 6 Dec 2002 by Alexey Shchepin %%% Id : $Id$ %%%---------------------------------------------------------------------- -module(ejabberd_s2s_in). -author('alexey@sevcom.net'). -vsn('$Revision$ '). -behaviour(gen_fsm). %% External exports -export([start/1, receiver/2, send_text/2, send_element/2]). %% gen_fsm callbacks -export([init/1, wait_for_stream/2, wait_for_key/2, wait_for_verification/2, stream_established/2, handle_info/3, terminate/3]). -include("ejabberd.hrl"). -record(state, {socket, receiver, streamid, myname, server, queue}). -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_DOMAIN_ERR, "" "Invalid Destination" "" ). %%%---------------------------------------------------------------------- %%% API %%%---------------------------------------------------------------------- start(Socket) -> gen_fsm:start(ejabberd_s2s_in, [Socket], ?FSMOPTS). %%%---------------------------------------------------------------------- %%% Callback functions from gen_fsm %%%---------------------------------------------------------------------- %%---------------------------------------------------------------------- %% Func: init/1 %% Returns: {ok, StateName, StateData} | %% {ok, StateName, StateData, Timeout} | %% ignore | %% {stop, StopReason} %%---------------------------------------------------------------------- init([Socket]) -> ReceiverPid = spawn(?MODULE, receiver, [Socket, self()]), {ok, wait_for_stream, #state{socket = Socket, receiver = ReceiverPid, streamid = new_id(), queue = queue:new()}}. %%---------------------------------------------------------------------- %% 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), xml:get_attr_s("xmlns:db", Attrs)} of {"jabber:server", "jabber:server:dialback"} -> Me = case xml:get_attr_s("to", Attrs) of "" -> ?MYNAME; Dom -> Dom end, case lists:member(Me, ejabberd_router:dirty_get_all_domains()) of true -> send_text(StateData#state.socket, ?STREAM_HEADER), {next_state, wait_for_key, StateData#state{myname = Me}}; _ -> send_text(StateData#state.socket, ?INVALID_DOMAIN_ERR), {stop, normal, StateData} end; _ -> send_text(StateData#state.socket, ?INVALID_HEADER_ERR), {stop, normal, StateData} end; wait_for_stream(closed, StateData) -> {stop, normal, StateData}. wait_for_key({xmlstreamelement, El}, StateData) -> case is_key_packet(El) of {key, To, From, Id, Key} -> io:format("GET KEY: ~p~n", [{To, From, Id, Key}]), ejabberd_s2s_out:start(StateData#state.myname, From, {verify, self(), Key}), {next_state, wait_for_verification, StateData#state{server = From}}; {verify, To, From, Id, Key} -> io:format("VERIFY KEY: ~p~n", [{To, From, Id, Key}]), Key1 = ejabberd_s2s:get_key({StateData#state.myname, From}), Type = if Key == Key1 -> "valid"; true -> "invalid" end, send_element(StateData#state.socket, {xmlelement, "db:verify", [{"from", StateData#state.myname}, {"to", From}, {"id", Id}, {"type", Type}], []}), {next_state, wait_for_key, StateData}; _ -> {next_state, wait_for_key, StateData} end; wait_for_key({xmlstreamend, Name}, StateData) -> % TODO {stop, normal, StateData}; wait_for_key(closed, StateData) -> {stop, normal, StateData}. wait_for_verification(valid, StateData) -> send_element(StateData#state.socket, {xmlelement, "db:result", [{"from", StateData#state.myname}, {"to", StateData#state.server}, {"type", "valid"}], []}), send_queue(StateData#state.socket, StateData#state.queue), {next_state, stream_established, StateData}; wait_for_verification(invalid, StateData) -> send_element(StateData#state.socket, {xmlelement, "db:result", [{"from", StateData#state.myname}, {"to", StateData#state.server}, {"type", "invalid"}], []}), {stop, normal, StateData}; wait_for_verification({xmlstreamelement, El}, StateData) -> case is_key_packet(El) of {verify, To, From, Id, Key} -> io:format("VERIFY KEY: ~p~n", [{To, From, Id, Key}]), Key1 = ejabberd_s2s:get_key({StateData#state.myname, From}), Type = if Key == Key1 -> "valid"; true -> "invalid" end, send_element(StateData#state.socket, {xmlelement, "db:verify", [{"from", StateData#state.myname}, {"to", From}, {"id", Id}, {"type", Type}], []}), {next_state, wait_for_verification, StateData}; _ -> {next_state, wait_for_verification, StateData} end; wait_for_verification({xmlstreamend, Name}, StateData) -> % TODO {stop, normal, StateData}; wait_for_verification(closed, StateData) -> {stop, normal, StateData}. stream_established({xmlstreamelement, El}, StateData) -> {xmlelement, Name, Attrs, Els} = El, case Name of "db:verify" -> case is_key_packet(El) of {verify, To, From, Id, Key} -> io:format("VERIFY KEY: ~p~n", [{To, From, Id, Key}]), Key1 = ejabberd_s2s:get_key({StateData#state.myname, From}), Type = if Key == Key1 -> "valid"; true -> "invalid" end, send_element(StateData#state.socket, {xmlelement, "db:verify", [{"from", StateData#state.myname}, {"to", From}, {"id", Id}, {"type", Type}], []}); _ -> ok end; _ -> From = xml:get_attr_s("from", Attrs), FromJID1 = jlib:string_to_jid(From), FromJID = case FromJID1 of {Node, Server, Resource} -> if Server == StateData#state.server -> 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 -> error end end, {next_state, stream_established, StateData}; stream_established({xmlstreamend, Name}, StateData) -> % TODO {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}. %%---------------------------------------------------------------------- %% 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) -> case StateName of stream_established -> send_element(StateData#state.socket, El), {next_state, StateName, StateData}; _ -> Q = queue:in(El, StateData#state.queue), {next_state, StateName, StateData#state{queue = Q}} end. %%---------------------------------------------------------------------- %% Func: terminate/3 %% Purpose: Shutdown the fsm %% Returns: any %%---------------------------------------------------------------------- terminate(Reason, StateName, StateData) -> % case StateData#state.user of % "" -> % ok; % _ -> % %ejabberd_sm:close_session(StateData#state.user, % % StateData#state.resource) % end, %ejabberd_s2s ! {closed_conection, StateData#state.server}, 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)). send_queue(Socket, Q) -> case queue:out(Q) of {{value, El}, Q1} -> send_element(Socket, El), send_queue(Socket, Q1); {empty, Q1} -> ok end. new_id() -> randoms:get_string(). is_key_packet({xmlelement, Name, Attrs, Els}) when Name == "db:result" -> {key, xml:get_attr_s("to", Attrs), xml:get_attr_s("from", Attrs), xml:get_attr_s("id", Attrs), xml:get_cdata(Els)}; is_key_packet({xmlelement, Name, Attrs, Els}) when Name == "db:verify" -> {verify, xml:get_attr_s("to", Attrs), xml:get_attr_s("from", Attrs), xml:get_attr_s("id", Attrs), xml:get_cdata(Els)}; is_key_packet(_) -> false.