mirror of
https://github.com/processone/ejabberd.git
synced 2024-12-28 17:38:54 +01:00
533 lines
16 KiB
Erlang
533 lines
16 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : ejabberd_s2s_out.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_out).
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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/3, start_link/3, send_text/2, send_element/2]).
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%% gen_fsm callbacks
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-export([init/1,
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open_socket/2,
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wait_for_stream/2,
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wait_for_validation/2,
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stream_established/2,
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handle_event/3,
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handle_sync_event/4,
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handle_info/3,
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terminate/3,
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code_change/4]).
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-include("ejabberd.hrl").
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-include("jlib.hrl").
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-record(state, {socket, receiver, streamid,
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myname, server, xmlpid, queue,
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new = false, verify = false,
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timer}).
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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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"to='~s'>"
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).
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-define(STREAM_TRAILER, "</stream:stream>").
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-define(INVALID_NAMESPACE_ERR,
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xml:element_to_string(?SERR_INVALID_NAMESPACE)).
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-define(HOST_UNKNOWN_ERR,
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xml:element_to_string(?SERR_HOST_UNKNOWN)).
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-define(INVALID_XML_ERR,
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xml:element_to_string(?SERR_XML_NOT_WELL_FORMED)).
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%%%----------------------------------------------------------------------
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%%% API
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%%%----------------------------------------------------------------------
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start(From, Host, Type) ->
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supervisor:start_child(ejabberd_s2s_out_sup, [From, Host, Type]).
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start_link(From, Host, Type) ->
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gen_fsm:start_link(ejabberd_s2s_out, [From, Host, Type], ?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([From, Server, Type]) ->
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?INFO_MSG("started: ~p", [{From, Server, Type}]),
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gen_fsm:send_event(self(), init),
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{New, Verify} = case Type of
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{new, Key} ->
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{Key, false};
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{verify, Pid, Key, SID} ->
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{false, {Pid, Key, SID}}
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end,
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Timer = erlang:start_timer(?S2STIMEOUT, self(), []),
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{ok, open_socket, #state{queue = queue:new(),
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myname = From,
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server = Server,
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new = New,
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verify = Verify,
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timer = Timer}}.
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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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open_socket(init, StateData) ->
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{Addr, Port} = get_addr_port(StateData#state.server),
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Res = case idna:domain_utf8_to_ascii(Addr) of
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false -> {error, badarg};
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ASCIIAddr ->
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?DEBUG("s2s_out: connecting to ~s:~p~n", [ASCIIAddr, Port]),
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case gen_tcp:connect(ASCIIAddr, Port,
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[binary, {packet, 0}]) of
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{ok, _Socket} = R -> R;
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{error, Reason1} ->
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?DEBUG("s2s_out: connect return ~p~n", [Reason1]),
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catch gen_tcp:connect(Addr, Port,
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[binary, {packet, 0}, inet6])
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end
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end,
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case Res of
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{ok, Socket} ->
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XMLStreamPid = xml_stream:start(self()),
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send_text(Socket, io_lib:format(?STREAM_HEADER,
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[StateData#state.server])),
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{next_state, wait_for_stream,
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StateData#state{socket = Socket,
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xmlpid = XMLStreamPid,
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streamid = new_id()}};
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{error, Reason} ->
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?DEBUG("s2s_out: inet6 connect return ~p~n", [Reason]),
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Error = ?ERR_REMOTE_SERVER_NOT_FOUND,
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bounce_messages(Error),
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{stop, normal, StateData};
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{'EXIT', Reason} ->
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?DEBUG("s2s_out: inet6 connect crashed ~p~n", [Reason]),
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Error = ?ERR_REMOTE_SERVER_NOT_FOUND,
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bounce_messages(Error),
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{stop, normal, StateData}
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end.
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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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Server = StateData#state.server,
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New = case StateData#state.new of
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false ->
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case ejabberd_s2s:try_register(
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{StateData#state.myname, Server}) of
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{key, Key} ->
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Key;
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false ->
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false
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end;
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Key ->
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Key
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end,
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case New of
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false ->
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ok;
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Key1 ->
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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", StateData#state.myname},
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{"to", Server}],
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[{xmlcdata, Key1}]})
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end,
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case StateData#state.verify of
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false ->
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ok;
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{Pid, Key2, SID} ->
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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", StateData#state.myname},
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{"to", StateData#state.server},
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{"id", SID}],
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[{xmlcdata, Key2}]})
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end,
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{next_state, wait_for_validation, StateData#state{new = New}};
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_ ->
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send_text(StateData#state.socket, ?INVALID_NAMESPACE_ERR),
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{stop, normal, StateData}
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end;
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wait_for_stream({xmlstreamerror, _}, StateData) ->
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send_text(StateData#state.socket,
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?STREAM_HEADER ++ ?INVALID_XML_ERR ++ ?STREAM_TRAILER),
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{stop, normal, StateData};
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wait_for_stream(timeout, StateData) ->
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{stop, normal, StateData};
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wait_for_stream(closed, StateData) ->
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{stop, normal, StateData}.
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wait_for_validation({xmlstreamelement, El}, StateData) ->
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case is_verify_res(El) of
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{result, To, From, Id, Type} ->
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?INFO_MSG("recv result: ~p", [{From, To, Id, Type}]),
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case Type of
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"valid" ->
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send_queue(StateData#state.socket, StateData#state.queue),
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{next_state, stream_established,
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StateData#state{queue = queue:new()}};
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_ ->
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% TODO: bounce packets
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{stop, normal, StateData}
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end;
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{verify, To, From, Id, Type} ->
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?INFO_MSG("recv verify: ~p", [{From, To, Id, Type}]),
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case StateData#state.verify of
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false ->
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{next_state, wait_for_validation, StateData};
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{Pid, _Key, _SID} ->
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case Type of
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"valid" ->
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gen_fsm:send_event(
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Pid, {valid,
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StateData#state.server,
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StateData#state.myname});
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_ ->
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gen_fsm:send_event(
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Pid, {invalid,
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StateData#state.server,
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StateData#state.myname})
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end,
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if
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StateData#state.verify == false ->
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{stop, normal, StateData};
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true ->
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{next_state, wait_for_validation, StateData}
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end
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end;
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_ ->
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{next_state, wait_for_validation, StateData}
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end;
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wait_for_validation({xmlstreamend, Name}, StateData) ->
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{stop, normal, StateData};
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wait_for_validation({xmlstreamerror, _}, StateData) ->
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send_text(StateData#state.socket,
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?STREAM_HEADER ++ ?INVALID_XML_ERR ++ ?STREAM_TRAILER),
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{stop, normal, StateData};
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wait_for_validation(timeout, StateData) ->
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{stop, normal, StateData};
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wait_for_validation(closed, StateData) ->
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{stop, normal, StateData}.
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stream_established({xmlstreamelement, El}, StateData) ->
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?INFO_MSG("stream established", []),
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case is_verify_res(El) of
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{verify, VTo, VFrom, VId, VType} ->
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?INFO_MSG("recv verify: ~p", [{VFrom, VTo, VId, VType}]),
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case StateData#state.verify of
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{VPid, _VKey, _SID} ->
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case VType of
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"valid" ->
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gen_fsm:send_event(
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VPid, {valid,
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StateData#state.server,
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StateData#state.myname});
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_ ->
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gen_fsm:send_event(
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VPid, {invalid,
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StateData#state.server,
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StateData#state.myname})
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end;
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_ ->
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ok
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end;
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_ ->
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ok
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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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{stop, normal, StateData};
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stream_established({xmlstreamerror, _}, StateData) ->
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send_text(StateData#state.socket,
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?STREAM_HEADER ++ ?INVALID_XML_ERR ++ ?STREAM_TRAILER),
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{stop, normal, StateData};
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stream_established(timeout, StateData) ->
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{stop, normal, StateData};
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stream_established(closed, StateData) ->
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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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code_change(OldVsn, StateName, StateData, Extra) ->
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{ok, 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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cancel_timer(StateData#state.timer),
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Timer = erlang:start_timer(?S2STIMEOUT, self(), []),
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{next_state, StateName, StateData#state{timer = Timer}};
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handle_info({send_element, El}, StateName, StateData) ->
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cancel_timer(StateData#state.timer),
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Timer = erlang:start_timer(?S2STIMEOUT, self(), []),
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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#state{timer = Timer}};
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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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timer = Timer}}
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end;
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handle_info({tcp, Socket, Data}, StateName, StateData) ->
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xml_stream:send_text(StateData#state.xmlpid, Data),
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{next_state, StateName, StateData};
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handle_info({tcp_closed, Socket}, StateName, StateData) ->
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gen_fsm:send_event(self(), closed),
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{next_state, StateName, StateData};
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handle_info({tcp_error, Socket, Reason}, StateName, StateData) ->
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gen_fsm:send_event(self(), closed),
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{next_state, StateName, StateData};
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handle_info({timeout, Timer, _}, StateName,
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#state{timer = Timer} = StateData) ->
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{stop, normal, StateData};
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handle_info(_, StateName, StateData) ->
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{next_state, StateName, StateData}.
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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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?INFO_MSG("terminated: ~p", [Reason]),
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Error = ?ERR_REMOTE_SERVER_NOT_FOUND,
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bounce_queue(StateData#state.queue, Error),
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case StateData#state.new of
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false ->
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ok;
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Key ->
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ejabberd_s2s ! {closed_conection, {StateData#state.myname,
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StateData#state.server}}
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end,
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case StateData#state.socket of
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undefined ->
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ok;
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Socket ->
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gen_tcp:close(Socket),
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exit(StateData#state.xmlpid, closed)
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end,
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ok.
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%%%----------------------------------------------------------------------
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%%% Internal functions
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%%%----------------------------------------------------------------------
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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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bounce_queue(Q, Error) ->
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case queue:out(Q) of
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{{value, El}, Q1} ->
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Err = jlib:make_error_reply(El, Error),
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From = jlib:string_to_jid(xml:get_tag_attr_s("from", El)),
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To = jlib:string_to_jid(xml:get_tag_attr_s("to", El)),
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ejabberd_router:route(To, From, Err),
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bounce_queue(Q1, Error);
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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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randoms:get_string().
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cancel_timer(Timer) ->
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erlang:cancel_timer(Timer),
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receive
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{timeout, Timer, _} ->
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ok
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after 0 ->
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ok
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end.
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bounce_messages(Error) ->
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receive
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{send_element, El} ->
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{xmlelement, _Name, Attrs, _SubTags} = El,
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case xml:get_attr_s("type", Attrs) of
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"error" ->
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ok;
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_ ->
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Err = jlib:make_error_reply(El, Error),
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From = jlib:string_to_jid(xml:get_attr_s("from", Attrs)),
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To = jlib:string_to_jid(xml:get_attr_s("to", Attrs)),
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ejabberd_router:route(To, From, Err)
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end,
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bounce_messages(Error)
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after 0 ->
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ok
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end.
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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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is_verify_res({xmlelement, Name, Attrs, Els}) when Name == "db:result" ->
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{result,
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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_attr_s("type", Attrs)};
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is_verify_res({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_attr_s("type", Attrs)};
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is_verify_res(_) ->
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false.
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% SRV support
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-include_lib("kernel/include/inet.hrl").
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get_addr_port(Server) ->
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Res = case inet_res:getbyname("_xmpp-server._tcp." ++ Server, srv) of
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{error, _Reason} ->
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inet_res:getbyname("_jabber._tcp." ++ Server, srv);
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{ok, _HEnt} = R -> R
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end,
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case Res of
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{error, Reason} ->
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?DEBUG("srv lookup of '~s' failed: ~p~n", [Server, Reason]),
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{Server, ejabberd_config:get_local_option(outgoing_s2s_port)};
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{ok, HEnt} ->
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?DEBUG("srv lookup of '~s': ~p~n",
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[Server, HEnt#hostent.h_addr_list]),
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case HEnt#hostent.h_addr_list of
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[] ->
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{Server,
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ejabberd_config:get_local_option(outgoing_s2s_port)};
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[{_, _, Port, Host} | _] ->
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{Host, Port}
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end
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end.
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