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SVN Revision: 12

1 files changed, 274 insertions, 0 deletions

diff --git a/src/ejabberd_s2s_in.erl b/src/ejabberd_s2s_in.erl
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+++ b/src/ejabberd_s2s_in.erl
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+%%%----------------------------------------------------------------------
+%%% File    : ejabberd_s2s_in.erl
+%%% Author  : Alexey Shchepin <alexey@sevcom.net>
+%%% Purpose : 
+%%% Created :  6 Dec 2002 by Alexey Shchepin <alexey@sevcom.net>
+%%% 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, session_established/2,
+	 handle_info/3,
+	 terminate/3]).
+
+-record(state, {socket, receiver, streamid,
+		myself = "localhost", server}).
+
+-include("ejabberd.hrl").
+
+-define(DBGFSM, true).
+
+-ifdef(DBGFSM).
+-define(FSMOPTS, [{debug, [trace]}]).
+-else.
+-define(FSMOPTS, []).
+-endif.
+
+-define(STREAM_HEADER,
+	"<?xml version='1.0'?>"
+	"<stream:stream "
+	"xmlns:stream='http://etherx.jabber.org/streams' "
+	"xmlns='jabber:server' "
+	"xmlns:db='jabber:server:dialback'>"
+       ).
+
+-define(STREAM_TRAILER, "</stream:stream>").
+
+-define(INVALID_HEADER_ERR,
+	"<stream:stream>"
+	"<stream:error>Invalid Stream Header</stream:error>"
+	"</stream:stream>"
+       ).
+
+%%%----------------------------------------------------------------------
+%%% 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()}}.
+
+%%----------------------------------------------------------------------
+%% 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"} ->
+	    send_text(StateData#state.socket, ?STREAM_HEADER),
+	    {next_state, wait_for_key, StateData};
+	_ ->
+	    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}]),
+	    % TODO
+	    ejabberd_s2s_out:start(From, {verify, self(), Key}),
+	    {next_state, wait_for_key, StateData};
+	{verify, To, From, Id, Key} ->
+	    io:format("VERIFY KEY: ~p~n", [{To, From, Id, Key}]),
+	    % TODO
+	    {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}.
+
+session_established({xmlstreamelement, El}, StateData) ->
+    {xmlelement, Name, Attrs, Els} = El,
+    % TODO
+    FromJID = {StateData#state.server},
+    To = xml:get_attr_s("to", Attrs),
+    ToJID = case To of
+		"" ->
+		    {"", StateData#state.server, ""};
+		_ ->
+		    jlib:string_to_jid(To)
+	    end,
+    case ToJID of
+	error ->
+	    % TODO
+	    error;
+	_ ->
+	    %?DEBUG("FromJID=~w, ToJID=~w, El=~w~n", [FromJID, ToJID, El]),
+	    ejabberd_router:route(FromJID, ToJID, El)
+    end,
+    {next_state, session_established, StateData};
+
+session_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}.
+
+%%----------------------------------------------------------------------
+%% 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,
+    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, closed} ->
+	    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() ->
+    lists:flatten(io_lib:format("~p", [random:uniform(65536*65536)])).
+
+
+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.
+
+get_auth_tags([{xmlelement, Name, Attrs, Els}| L], U, P, D, R) ->
+    CData = xml:get_cdata(Els),
+    case Name of
+	"username" ->
+	    get_auth_tags(L, CData, P, D, R);
+	"password" ->
+	    get_auth_tags(L, U, CData, D, R);
+	"digest" ->
+	    get_auth_tags(L, U, P, CData, R);
+	"resource" ->
+	    get_auth_tags(L, U, P, D, CData);
+	_ ->
+	    get_auth_tags(L, U, P, D, R)
+    end;
+get_auth_tags([_ | L], U, P, D, R) ->
+    get_auth_tags(L, U, P, D, R);
+get_auth_tags([], U, P, D, R) ->
+    {U, P, D, R}.
+
+
+
+