%%%----------------------------------------------------------------------
%%% 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/2, 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_event/3,
handle_sync_event/4,
code_change/4,
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,
"<?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>"
).
-define(INVALID_DOMAIN_ERR,
"<stream:stream>"
"<stream:error>Invalid Destination</stream:error>"
"</stream:stream>"
).
%%%----------------------------------------------------------------------
%%% API
%%%----------------------------------------------------------------------
start(Socket, Opts) ->
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}
%%----------------------------------------------------------------------
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, ?S2STIMEOUT};
stream_established({xmlstreamend, Name}, StateData) ->
% TODO
{stop, normal, StateData};
stream_established(timeout, StateData) ->
{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) ->
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.
