350 lines
11 KiB
Erlang
350 lines
11 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : ejabberd_s2s_in.erl
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%%% Author : Alexey Shchepin <alexey@sevcom.net>
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%%% Purpose :
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%%% Created : 6 Dec 2002 by Alexey Shchepin <alexey@sevcom.net>
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%%% Id : $Id$
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%%%----------------------------------------------------------------------
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-module(ejabberd_s2s_in).
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-author('alexey@sevcom.net').
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-vsn('$Revision$ ').
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-behaviour(gen_fsm).
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%% External exports
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-export([start/1, receiver/2, send_text/2, send_element/2]).
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%% gen_fsm callbacks
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-export([init/1,
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wait_for_stream/2,
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wait_for_key/2,
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wait_for_verification/2,
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stream_established/2,
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handle_info/3,
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terminate/3]).
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-include("ejabberd.hrl").
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-record(state, {socket, receiver, streamid,
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myself = ?MYNAME, server, queue}).
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-define(DBGFSM, true).
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-ifdef(DBGFSM).
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-define(FSMOPTS, [{debug, [trace]}]).
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-else.
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-define(FSMOPTS, []).
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-endif.
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-define(STREAM_HEADER,
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"<?xml version='1.0'?>"
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"<stream:stream "
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"xmlns:stream='http://etherx.jabber.org/streams' "
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"xmlns='jabber:server' "
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"xmlns:db='jabber:server:dialback'>"
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).
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-define(STREAM_TRAILER, "</stream:stream>").
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-define(INVALID_HEADER_ERR,
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"<stream:stream>"
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"<stream:error>Invalid Stream Header</stream:error>"
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"</stream:stream>"
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).
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%%%----------------------------------------------------------------------
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%%% API
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%%%----------------------------------------------------------------------
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start(Socket) ->
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gen_fsm:start(ejabberd_s2s_in, [Socket], ?FSMOPTS).
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%%%----------------------------------------------------------------------
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%%% Callback functions from gen_fsm
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%%%----------------------------------------------------------------------
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%%----------------------------------------------------------------------
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%% Func: init/1
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%% Returns: {ok, StateName, StateData} |
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%% {ok, StateName, StateData, Timeout} |
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%% ignore |
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%% {stop, StopReason}
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%%----------------------------------------------------------------------
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init([Socket]) ->
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ReceiverPid = spawn(?MODULE, receiver, [Socket, self()]),
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{ok, wait_for_stream, #state{socket = Socket,
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receiver = ReceiverPid,
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streamid = new_id(),
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queue = queue:new()}}.
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%%----------------------------------------------------------------------
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%% Func: StateName/2
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%% Returns: {next_state, NextStateName, NextStateData} |
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%% {next_state, NextStateName, NextStateData, Timeout} |
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%% {stop, Reason, NewStateData}
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%%----------------------------------------------------------------------
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state_name(Event, StateData) ->
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{next_state, state_name, StateData}.
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wait_for_stream({xmlstreamstart, Name, Attrs}, StateData) ->
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% TODO
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case {xml:get_attr_s("xmlns", Attrs), xml:get_attr_s("xmlns:db", Attrs)} of
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{"jabber:server", "jabber:server:dialback"} ->
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send_text(StateData#state.socket, ?STREAM_HEADER),
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{next_state, wait_for_key, StateData};
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_ ->
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send_text(StateData#state.socket, ?INVALID_HEADER_ERR),
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{stop, normal, StateData}
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end;
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wait_for_stream(closed, StateData) ->
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{stop, normal, StateData}.
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wait_for_key({xmlstreamelement, El}, StateData) ->
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case is_key_packet(El) of
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{key, To, From, Id, Key} ->
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io:format("GET KEY: ~p~n", [{To, From, Id, Key}]),
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ejabberd_s2s_out:start(From, {verify, self(), Key}),
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{next_state,
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wait_for_verification,
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StateData#state{server = From}};
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{verify, To, From, Id, Key} ->
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io:format("VERIFY KEY: ~p~n", [{To, From, Id, Key}]),
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Key1 = ejabberd_s2s:get_key(From),
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Type = if Key == Key1 -> "valid";
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true -> "invalid"
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end,
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send_element(StateData#state.socket,
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{xmlelement,
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"db:verify",
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[{"from", ?MYNAME},
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{"to", From},
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{"id", Id},
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{"type", Type}],
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[]}),
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{next_state, wait_for_key, StateData};
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_ ->
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{next_state, wait_for_key, StateData}
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end;
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wait_for_key({xmlstreamend, Name}, StateData) ->
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% TODO
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{stop, normal, StateData};
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wait_for_key(closed, StateData) ->
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{stop, normal, StateData}.
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wait_for_verification(valid, StateData) ->
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send_element(StateData#state.socket,
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{xmlelement,
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"db:result",
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[{"from", ?MYNAME},
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{"to", StateData#state.server},
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{"type", "valid"}],
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[]}),
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send_queue(StateData#state.socket, StateData#state.queue),
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{next_state, stream_established, StateData};
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wait_for_verification(invalid, StateData) ->
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send_element(StateData#state.socket,
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{xmlelement,
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"db:result",
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[{"from", ?MYNAME},
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{"to", StateData#state.server},
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{"type", "invalid"}],
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[]}),
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{stop, normal, StateData};
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wait_for_verification({xmlstreamelement, El}, StateData) ->
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case is_key_packet(El) of
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{verify, To, From, Id, Key} ->
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io:format("VERIFY KEY: ~p~n", [{To, From, Id, Key}]),
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Key1 = ejabberd_s2s:get_key(From),
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Type = if Key == Key1 -> "valid";
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true -> "invalid"
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end,
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send_element(StateData#state.socket,
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{xmlelement,
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"db:verify",
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[{"from", ?MYNAME},
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{"to", From},
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{"id", Id},
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{"type", Type}],
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[]}),
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{next_state, wait_for_verification, StateData};
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_ ->
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{next_state, wait_for_verification, StateData}
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end;
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wait_for_verification({xmlstreamend, Name}, StateData) ->
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% TODO
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{stop, normal, StateData};
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wait_for_verification(closed, StateData) ->
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{stop, normal, StateData}.
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stream_established({xmlstreamelement, El}, StateData) ->
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{xmlelement, Name, Attrs, Els} = El,
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% TODO
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From = xml:get_attr_s("from", Attrs),
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FromJID1 = jlib:string_to_jid(From),
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FromJID = case FromJID1 of
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{Node, Server, Resource} ->
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if Server == StateData#state.server -> FromJID1;
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true -> error
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end;
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_ -> error
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end,
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To = xml:get_attr_s("to", Attrs),
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ToJID = case To of
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"" -> error;
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_ -> jlib:string_to_jid(To)
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end,
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if ((Name == "iq") or (Name == "message") or (Name == "presence")) and
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(ToJID /= error) and (FromJID /= error) ->
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ejabberd_router:route(FromJID, ToJID, El);
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true ->
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error
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end,
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{next_state, stream_established, StateData};
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stream_established({xmlstreamend, Name}, StateData) ->
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% TODO
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{stop, normal, StateData};
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stream_established(closed, StateData) ->
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% TODO
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{stop, normal, StateData}.
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%%----------------------------------------------------------------------
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%% Func: StateName/3
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%% Returns: {next_state, NextStateName, NextStateData} |
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%% {next_state, NextStateName, NextStateData, Timeout} |
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%% {reply, Reply, NextStateName, NextStateData} |
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%% {reply, Reply, NextStateName, NextStateData, Timeout} |
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%% {stop, Reason, NewStateData} |
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%% {stop, Reason, Reply, NewStateData}
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%%----------------------------------------------------------------------
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state_name(Event, From, StateData) ->
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Reply = ok,
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{reply, Reply, state_name, StateData}.
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%%----------------------------------------------------------------------
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%% Func: handle_event/3
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%% Returns: {next_state, NextStateName, NextStateData} |
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%% {next_state, NextStateName, NextStateData, Timeout} |
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%% {stop, Reason, NewStateData}
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%%----------------------------------------------------------------------
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handle_event(Event, StateName, StateData) ->
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{next_state, StateName, StateData}.
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%%----------------------------------------------------------------------
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%% Func: handle_sync_event/4
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%% Returns: {next_state, NextStateName, NextStateData} |
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%% {next_state, NextStateName, NextStateData, Timeout} |
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%% {reply, Reply, NextStateName, NextStateData} |
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%% {reply, Reply, NextStateName, NextStateData, Timeout} |
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%% {stop, Reason, NewStateData} |
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%% {stop, Reason, Reply, NewStateData}
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%%----------------------------------------------------------------------
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handle_sync_event(Event, From, StateName, StateData) ->
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Reply = ok,
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{reply, Reply, StateName, StateData}.
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%%----------------------------------------------------------------------
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%% Func: handle_info/3
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%% Returns: {next_state, NextStateName, NextStateData} |
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%% {next_state, NextStateName, NextStateData, Timeout} |
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%% {stop, Reason, NewStateData}
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%%----------------------------------------------------------------------
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handle_info({send_text, Text}, StateName, StateData) ->
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send_text(StateData#state.socket, Text),
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{next_state, StateName, StateData};
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handle_info({send_element, El}, StateName, StateData) ->
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case StateName of
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stream_established ->
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send_element(StateData#state.socket, El),
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{next_state, StateName, StateData};
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_ ->
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Q = queue:in(El, StateData#state.queue),
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{next_state, StateName, StateData#state{queue = Q}}
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end.
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%%----------------------------------------------------------------------
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%% Func: terminate/3
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%% Purpose: Shutdown the fsm
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%% Returns: any
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%%----------------------------------------------------------------------
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terminate(Reason, StateName, StateData) ->
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% case StateData#state.user of
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% "" ->
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% ok;
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% _ ->
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% %ejabberd_sm:close_session(StateData#state.user,
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% % StateData#state.resource)
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% end,
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%ejabberd_s2s ! {closed_conection, StateData#state.server},
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gen_tcp:close(StateData#state.socket),
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ok.
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%%%----------------------------------------------------------------------
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%%% Internal functions
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%%%----------------------------------------------------------------------
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receiver(Socket, C2SPid) ->
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XMLStreamPid = xml_stream:start(C2SPid),
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receiver(Socket, C2SPid, XMLStreamPid).
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receiver(Socket, C2SPid, XMLStreamPid) ->
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case gen_tcp:recv(Socket, 0) of
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{ok, Text} ->
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xml_stream:send_text(XMLStreamPid, Text),
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receiver(Socket, C2SPid, XMLStreamPid);
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{error, closed} ->
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exit(XMLStreamPid, closed),
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gen_fsm:send_event(C2SPid, closed),
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ok
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end.
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send_text(Socket, Text) ->
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gen_tcp:send(Socket,Text).
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send_element(Socket, El) ->
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send_text(Socket, xml:element_to_string(El)).
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send_queue(Socket, Q) ->
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case queue:out(Q) of
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{{value, El}, Q1} ->
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send_element(Socket, El),
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send_queue(Socket, Q1);
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{empty, Q1} ->
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ok
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end.
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new_id() ->
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lists:flatten(io_lib:format("~p", [random:uniform(65536*65536)])).
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is_key_packet({xmlelement, Name, Attrs, Els}) when Name == "db:result" ->
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{key,
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xml:get_attr_s("to", Attrs),
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xml:get_attr_s("from", Attrs),
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xml:get_attr_s("id", Attrs),
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xml:get_cdata(Els)};
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is_key_packet({xmlelement, Name, Attrs, Els}) when Name == "db:verify" ->
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{verify,
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xml:get_attr_s("to", Attrs),
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xml:get_attr_s("from", Attrs),
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xml:get_attr_s("id", Attrs),
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xml:get_cdata(Els)};
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is_key_packet(_) ->
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false.
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