mirror of
https://github.com/processone/ejabberd.git
synced 2024-12-06 16:42:56 +01:00
1226 lines
40 KiB
Erlang
1226 lines
40 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : ejabberd_s2s_out.erl
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%%% Author : Alexey Shchepin <alexey@process-one.net>
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%%% Purpose : Manage outgoing server-to-server connections
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%%% Created : 6 Dec 2002 by Alexey Shchepin <alexey@process-one.net>
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%%%
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%%%
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%%% ejabberd, Copyright (C) 2002-2010 ProcessOne
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%%%
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%%% This program is free software; you can redistribute it and/or
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%%% modify it under the terms of the GNU General Public License as
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%%% published by the Free Software Foundation; either version 2 of the
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%%% License, or (at your option) any later version.
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%%%
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%%% This program is distributed in the hope that it will be useful,
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%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
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%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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%%% General Public License for more details.
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%%%
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%%% You should have received a copy of the GNU General Public License
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%%% along with this program; if not, write to the Free Software
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%%% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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%%% 02111-1307 USA
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%%%
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%%%----------------------------------------------------------------------
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-module(ejabberd_s2s_out).
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-author('alexey@process-one.net').
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-behaviour(p1_fsm).
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%% External exports
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-export([start/3,
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start_link/3,
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start_connection/1,
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terminate_if_waiting_delay/2,
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stop_connection/1]).
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%% p1_fsm callbacks (same as gen_fsm)
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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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wait_for_features/2,
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wait_for_auth_result/2,
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wait_for_starttls_proceed/2,
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reopen_socket/2,
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wait_before_retry/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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print_state/1,
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code_change/4,
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test_get_addr_port/1,
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get_addr_port/1]).
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-include("ejabberd.hrl").
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-include("jlib.hrl").
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-record(state, {socket,
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streamid,
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use_v10,
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tls = false,
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tls_required = false,
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tls_enabled = false,
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tls_options = [],
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authenticated = false,
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db_enabled = true,
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try_auth = true,
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myname, server, queue,
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delay_to_retry = undefined_delay,
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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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%% Module start with or without supervisor:
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-ifdef(NO_TRANSIENT_SUPERVISORS).
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-define(SUPERVISOR_START, p1_fsm:start(ejabberd_s2s_out, [From, Host, Type],
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fsm_limit_opts() ++ ?FSMOPTS)).
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-else.
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-define(SUPERVISOR_START, supervisor:start_child(ejabberd_s2s_out_sup,
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[From, Host, Type])).
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-endif.
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-define(FSMTIMEOUT, 30000).
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%% We do not block on send anymore.
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-define(TCP_SEND_TIMEOUT, 15000).
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%% Maximum delay to wait before retrying to connect after a failed attempt.
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%% Specified in miliseconds. Default value is 5 minutes.
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-define(MAX_RETRY_DELAY, 300000).
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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'~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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-define(SOCKET_DEFAULT_RESULT, {error, badarg}).
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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.
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start_link(From, Host, Type) ->
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p1_fsm:start_link(ejabberd_s2s_out, [From, Host, Type],
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fsm_limit_opts() ++ ?FSMOPTS).
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start_connection(Pid) ->
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p1_fsm:send_event(Pid, init).
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stop_connection(Pid) ->
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p1_fsm:send_event(Pid, stop).
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%%%----------------------------------------------------------------------
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%%% Callback functions from p1_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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process_flag(trap_exit, true),
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?DEBUG("started: ~p", [{From, Server, Type}]),
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TLS = case ejabberd_config:get_local_option(s2s_use_starttls) of
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undefined ->
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false;
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UseStartTLS ->
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UseStartTLS
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end,
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UseV10 = TLS,
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TLSOpts = case ejabberd_config:get_local_option(s2s_certfile) of
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undefined ->
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[];
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CertFile ->
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[{certfile, CertFile}, connect]
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end,
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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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start_connection(self()),
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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{use_v10 = UseV10,
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tls = TLS,
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tls_options = TLSOpts,
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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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log_s2s_out(StateData#state.new,
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StateData#state.myname,
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StateData#state.server,
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StateData#state.tls),
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?DEBUG("open_socket: ~p", [{StateData#state.myname,
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StateData#state.server,
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StateData#state.new,
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StateData#state.verify}]),
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AddrList = case idna:domain_utf8_to_ascii(StateData#state.server) of
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false -> [];
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ASCIIAddr ->
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get_addr_port(ASCIIAddr)
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end,
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case lists:foldl(fun({Addr, Port}, Acc) ->
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case Acc of
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{ok, Socket} ->
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{ok, Socket};
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_ ->
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open_socket1(Addr, Port)
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end
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end, ?SOCKET_DEFAULT_RESULT, AddrList) of
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{ok, Socket} ->
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Version = if
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StateData#state.use_v10 ->
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" version='1.0'";
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true ->
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""
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end,
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NewStateData = StateData#state{socket = Socket,
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tls_enabled = false,
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streamid = new_id()},
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send_text(NewStateData, io_lib:format(?STREAM_HEADER,
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[StateData#state.server,
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Version])),
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{next_state, wait_for_stream, NewStateData, ?FSMTIMEOUT};
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{error, _Reason} ->
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?INFO_MSG("s2s connection: ~s -> ~s (remote server not found)",
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[StateData#state.myname, StateData#state.server]),
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wait_before_reconnect(StateData)
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%%{stop, normal, StateData}
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end;
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open_socket(stop, StateData) ->
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?INFO_MSG("s2s connection: ~s -> ~s (stopped in open socket)",
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[StateData#state.myname, StateData#state.server]),
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{stop, normal, StateData};
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open_socket(timeout, StateData) ->
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?INFO_MSG("s2s connection: ~s -> ~s (timeout in open socket)",
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[StateData#state.myname, StateData#state.server]),
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{stop, normal, StateData};
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open_socket(_, StateData) ->
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{next_state, open_socket, StateData}.
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%%----------------------------------------------------------------------
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%% IPv4
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open_socket1({_,_,_,_} = Addr, Port) ->
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open_socket2(inet, Addr, Port);
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%% IPv6
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open_socket1({_,_,_,_,_,_,_,_} = Addr, Port) ->
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open_socket2(inet6, Addr, Port);
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%% Hostname
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open_socket1(Host, Port) ->
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lists:foldl(fun(_Family, {ok, _Socket} = R) ->
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R;
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(Family, _) ->
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Addrs = get_addrs(Host, Family),
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lists:foldl(fun(_Addr, {ok, _Socket} = R) ->
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R;
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(Addr, _) ->
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open_socket1(Addr, Port)
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end, ?SOCKET_DEFAULT_RESULT, Addrs)
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end, ?SOCKET_DEFAULT_RESULT, outgoing_s2s_families()).
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open_socket2(Type, Addr, Port) ->
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?DEBUG("s2s_out: connecting to ~p:~p~n", [Addr, Port]),
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Timeout = outgoing_s2s_timeout(),
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SockOpts = try erlang:system_info(otp_release) >= "R13B" of
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true -> [{send_timeout_close, true}];
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false -> []
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catch
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_:_ -> []
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end,
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case (catch ejabberd_socket:connect(Addr, Port,
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[binary, {packet, 0},
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{send_timeout, ?TCP_SEND_TIMEOUT},
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{active, false}, Type | SockOpts],
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Timeout)) of
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{ok, _Socket} = R -> R;
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{error, Reason} = R ->
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?DEBUG("s2s_out: connect return ~p~n", [Reason]),
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R;
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{'EXIT', Reason} ->
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?DEBUG("s2s_out: connect crashed ~p~n", [Reason]),
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{error, Reason}
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end.
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%%----------------------------------------------------------------------
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wait_for_stream({xmlstreamstart, _Name, Attrs}, StateData) ->
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case {xml:get_attr_s("xmlns", Attrs),
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xml:get_attr_s("xmlns:db", Attrs),
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xml:get_attr_s("version", Attrs) == "1.0"} of
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{"jabber:server", "jabber:server:dialback", false} ->
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send_db_request(StateData);
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{"jabber:server", "jabber:server:dialback", true} when
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StateData#state.use_v10 ->
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{next_state, wait_for_features, StateData, ?FSMTIMEOUT};
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{"jabber:server", "", true} when StateData#state.use_v10 ->
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{next_state, wait_for_features, StateData#state{db_enabled = false}, ?FSMTIMEOUT};
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{NSProvided, DB, _} ->
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send_text(StateData, ?INVALID_NAMESPACE_ERR),
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?INFO_MSG("Closing s2s connection: ~s -> ~s (invalid namespace).~n"
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"Namespace provided: ~p~nNamespace expected: \"jabber:server\"~n"
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"xmlns:db provided: ~p~nAll attributes: ~p",
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[StateData#state.myname, StateData#state.server, NSProvided, DB, Attrs]),
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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,
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?INVALID_XML_ERR ++ ?STREAM_TRAILER),
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?INFO_MSG("Closing s2s connection: ~s -> ~s (invalid xml)",
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[StateData#state.myname, StateData#state.server]),
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{stop, normal, StateData};
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wait_for_stream({xmlstreamend,_Name}, StateData) ->
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?INFO_MSG("Closing s2s connection: ~s -> ~s (xmlstreamend)",
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[StateData#state.myname, StateData#state.server]),
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{stop, normal, StateData};
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wait_for_stream(timeout, StateData) ->
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?INFO_MSG("Closing s2s connection: ~s -> ~s (timeout in wait_for_stream)",
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[StateData#state.myname, StateData#state.server]),
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{stop, normal, StateData};
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wait_for_stream(closed, StateData) ->
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?INFO_MSG("Closing s2s connection: ~s -> ~s (close in wait_for_stream)",
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[StateData#state.myname, StateData#state.server]),
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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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?DEBUG("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, StateData#state.queue),
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?INFO_MSG("Connection established: ~s -> ~s with TLS=~p",
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[StateData#state.myname, StateData#state.server, StateData#state.tls_enabled]),
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ejabberd_hooks:run(s2s_connect_hook,
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[StateData#state.myname,
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StateData#state.server]),
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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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?INFO_MSG("Closing s2s connection: ~s -> ~s (invalid dialback key)",
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[StateData#state.myname, StateData#state.server]),
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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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?DEBUG("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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NextState = wait_for_validation,
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%% TODO: Should'nt we close the connection here ?
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{next_state, NextState, StateData,
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get_timeout_interval(NextState)};
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{Pid, _Key, _SID} ->
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case Type of
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"valid" ->
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p1_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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p1_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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NextState = wait_for_validation,
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{next_state, NextState, StateData,
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get_timeout_interval(NextState)}
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end
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end;
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_ ->
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{next_state, wait_for_validation, StateData, ?FSMTIMEOUT*3}
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end;
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wait_for_validation({xmlstreamend, _Name}, StateData) ->
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?INFO_MSG("wait for validation: ~s -> ~s (xmlstreamend)",
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[StateData#state.myname, StateData#state.server]),
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{stop, normal, StateData};
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wait_for_validation({xmlstreamerror, _}, StateData) ->
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?INFO_MSG("wait for validation: ~s -> ~s (xmlstreamerror)",
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[StateData#state.myname, StateData#state.server]),
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send_text(StateData,
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?INVALID_XML_ERR ++ ?STREAM_TRAILER),
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{stop, normal, StateData};
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wait_for_validation(timeout, #state{verify = {VPid, VKey, SID}} = StateData)
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when is_pid(VPid) and is_list(VKey) and is_list(SID) ->
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%% This is an auxiliary s2s connection for dialback.
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%% This timeout is normal and doesn't represent a problem.
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?DEBUG("wait_for_validation: ~s -> ~s (timeout in verify connection)",
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[StateData#state.myname, StateData#state.server]),
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{stop, normal, StateData};
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|
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wait_for_validation(timeout, StateData) ->
|
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?INFO_MSG("wait_for_validation: ~s -> ~s (connect timeout)",
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[StateData#state.myname, StateData#state.server]),
|
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{stop, normal, StateData};
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|
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wait_for_validation(closed, StateData) ->
|
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?INFO_MSG("wait for validation: ~s -> ~s (closed)",
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[StateData#state.myname, StateData#state.server]),
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{stop, normal, StateData}.
|
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|
|
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wait_for_features({xmlstreamelement, El}, StateData) ->
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case El of
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{xmlelement, "stream:features", _Attrs, Els} ->
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{SASLEXT, StartTLS, StartTLSRequired} =
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lists:foldl(
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fun({xmlelement, "mechanisms", Attrs1, Els1} = _El1,
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{_SEXT, STLS, STLSReq} = Acc) ->
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case xml:get_attr_s("xmlns", Attrs1) of
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?NS_SASL ->
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NewSEXT =
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lists:any(
|
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fun({xmlelement, "mechanism", _, Els2}) ->
|
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case xml:get_cdata(Els2) of
|
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"EXTERNAL" -> true;
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|
_ -> false
|
|
end;
|
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(_) -> false
|
|
end, Els1),
|
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{NewSEXT, STLS, STLSReq};
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_ ->
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Acc
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end;
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|
({xmlelement, "starttls", Attrs1, _Els1} = El1,
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{SEXT, _STLS, _STLSReq} = Acc) ->
|
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case xml:get_attr_s("xmlns", Attrs1) of
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?NS_TLS ->
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Req = case xml:get_subtag(El1, "required") of
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{xmlelement, _, _, _} -> true;
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false -> false
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end,
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{SEXT, true, Req};
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_ ->
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Acc
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end;
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(_, Acc) ->
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Acc
|
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end, {false, false, false}, Els),
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|
if
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(not SASLEXT) and (not StartTLS) and
|
|
StateData#state.authenticated ->
|
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send_queue(StateData, StateData#state.queue),
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?INFO_MSG("Connection established: ~s -> ~s",
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[StateData#state.myname, StateData#state.server]),
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|
ejabberd_hooks:run(s2s_connect_hook,
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[StateData#state.myname,
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StateData#state.server]),
|
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{next_state, stream_established,
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StateData#state{queue = queue:new()}};
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|
SASLEXT and StateData#state.try_auth and
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|
(StateData#state.new /= false) ->
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send_element(StateData,
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{xmlelement, "auth",
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[{"xmlns", ?NS_SASL},
|
|
{"mechanism", "EXTERNAL"}],
|
|
[{xmlcdata,
|
|
jlib:encode_base64(
|
|
StateData#state.myname)}]}),
|
|
{next_state, wait_for_auth_result,
|
|
StateData#state{try_auth = false}, ?FSMTIMEOUT};
|
|
StartTLS and StateData#state.tls and
|
|
(not StateData#state.tls_enabled) ->
|
|
send_element(StateData,
|
|
{xmlelement, "starttls",
|
|
[{"xmlns", ?NS_TLS}], []}),
|
|
{next_state, wait_for_starttls_proceed, StateData,
|
|
?FSMTIMEOUT};
|
|
StartTLSRequired and (not StateData#state.tls) ->
|
|
?DEBUG("restarted: ~p", [{StateData#state.myname,
|
|
StateData#state.server}]),
|
|
ejabberd_socket:close(StateData#state.socket),
|
|
{next_state, reopen_socket,
|
|
StateData#state{socket = undefined,
|
|
use_v10 = false}, ?FSMTIMEOUT};
|
|
StateData#state.db_enabled ->
|
|
send_db_request(StateData);
|
|
true ->
|
|
?DEBUG("restarted: ~p", [{StateData#state.myname,
|
|
StateData#state.server}]),
|
|
% TODO: clear message queue
|
|
ejabberd_socket:close(StateData#state.socket),
|
|
{next_state, reopen_socket, StateData#state{socket = undefined,
|
|
use_v10 = false}, ?FSMTIMEOUT}
|
|
end;
|
|
_ ->
|
|
send_text(StateData,
|
|
xml:element_to_string(?SERR_BAD_FORMAT) ++
|
|
?STREAM_TRAILER),
|
|
?INFO_MSG("Closing s2s connection: ~s -> ~s (bad format)",
|
|
[StateData#state.myname, StateData#state.server]),
|
|
{stop, normal, StateData}
|
|
end;
|
|
|
|
wait_for_features({xmlstreamend, _Name}, StateData) ->
|
|
?INFO_MSG("wait_for_features: xmlstreamend", []),
|
|
{stop, normal, StateData};
|
|
|
|
wait_for_features({xmlstreamerror, _}, StateData) ->
|
|
send_text(StateData,
|
|
?INVALID_XML_ERR ++ ?STREAM_TRAILER),
|
|
?INFO_MSG("wait for features: xmlstreamerror", []),
|
|
{stop, normal, StateData};
|
|
|
|
wait_for_features(timeout, StateData) ->
|
|
?INFO_MSG("wait for features: timeout", []),
|
|
{stop, normal, StateData};
|
|
|
|
wait_for_features(closed, StateData) ->
|
|
?INFO_MSG("wait for features: closed", []),
|
|
{stop, normal, StateData}.
|
|
|
|
|
|
wait_for_auth_result({xmlstreamelement, El}, StateData) ->
|
|
case El of
|
|
{xmlelement, "success", Attrs, _Els} ->
|
|
case xml:get_attr_s("xmlns", Attrs) of
|
|
?NS_SASL ->
|
|
?DEBUG("auth: ~p", [{StateData#state.myname,
|
|
StateData#state.server}]),
|
|
ejabberd_socket:reset_stream(StateData#state.socket),
|
|
send_text(StateData,
|
|
io_lib:format(?STREAM_HEADER,
|
|
[StateData#state.server,
|
|
" version='1.0'"])),
|
|
{next_state, wait_for_stream,
|
|
StateData#state{streamid = new_id(),
|
|
authenticated = true
|
|
}, ?FSMTIMEOUT};
|
|
_ ->
|
|
send_text(StateData,
|
|
xml:element_to_string(?SERR_BAD_FORMAT) ++
|
|
?STREAM_TRAILER),
|
|
?INFO_MSG("Closing s2s connection: ~s -> ~s (bad format)",
|
|
[StateData#state.myname, StateData#state.server]),
|
|
{stop, normal, StateData}
|
|
end;
|
|
{xmlelement, "failure", Attrs, _Els} ->
|
|
case xml:get_attr_s("xmlns", Attrs) of
|
|
?NS_SASL ->
|
|
?DEBUG("restarted: ~p", [{StateData#state.myname,
|
|
StateData#state.server}]),
|
|
ejabberd_socket:close(StateData#state.socket),
|
|
{next_state, reopen_socket,
|
|
StateData#state{socket = undefined}, ?FSMTIMEOUT};
|
|
_ ->
|
|
send_text(StateData,
|
|
xml:element_to_string(?SERR_BAD_FORMAT) ++
|
|
?STREAM_TRAILER),
|
|
?INFO_MSG("Closing s2s connection: ~s -> ~s (bad format)",
|
|
[StateData#state.myname, StateData#state.server]),
|
|
{stop, normal, StateData}
|
|
end;
|
|
_ ->
|
|
send_text(StateData,
|
|
xml:element_to_string(?SERR_BAD_FORMAT) ++
|
|
?STREAM_TRAILER),
|
|
?INFO_MSG("Closing s2s connection: ~s -> ~s (bad format)",
|
|
[StateData#state.myname, StateData#state.server]),
|
|
{stop, normal, StateData}
|
|
end;
|
|
|
|
wait_for_auth_result({xmlstreamend, _Name}, StateData) ->
|
|
?INFO_MSG("wait for auth result: xmlstreamend", []),
|
|
{stop, normal, StateData};
|
|
|
|
wait_for_auth_result({xmlstreamerror, _}, StateData) ->
|
|
send_text(StateData,
|
|
?INVALID_XML_ERR ++ ?STREAM_TRAILER),
|
|
?INFO_MSG("wait for auth result: xmlstreamerror", []),
|
|
{stop, normal, StateData};
|
|
|
|
wait_for_auth_result(timeout, StateData) ->
|
|
?INFO_MSG("wait for auth result: timeout", []),
|
|
{stop, normal, StateData};
|
|
|
|
wait_for_auth_result(closed, StateData) ->
|
|
?INFO_MSG("wait for auth result: closed", []),
|
|
{stop, normal, StateData}.
|
|
|
|
|
|
wait_for_starttls_proceed({xmlstreamelement, El}, StateData) ->
|
|
case El of
|
|
{xmlelement, "proceed", Attrs, _Els} ->
|
|
case xml:get_attr_s("xmlns", Attrs) of
|
|
?NS_TLS ->
|
|
?DEBUG("starttls: ~p", [{StateData#state.myname,
|
|
StateData#state.server}]),
|
|
Socket = StateData#state.socket,
|
|
TLSOpts = case ejabberd_config:get_local_option(
|
|
{domain_certfile,
|
|
StateData#state.server}) of
|
|
undefined ->
|
|
StateData#state.tls_options;
|
|
CertFile ->
|
|
[{certfile, CertFile} |
|
|
lists:keydelete(
|
|
certfile, 1,
|
|
StateData#state.tls_options)]
|
|
end,
|
|
TLSSocket = ejabberd_socket:starttls(Socket, TLSOpts),
|
|
NewStateData = StateData#state{socket = TLSSocket,
|
|
streamid = new_id(),
|
|
tls_enabled = true
|
|
},
|
|
send_text(NewStateData,
|
|
io_lib:format(?STREAM_HEADER,
|
|
[StateData#state.server,
|
|
" version='1.0'"])),
|
|
{next_state, wait_for_stream, NewStateData, ?FSMTIMEOUT};
|
|
_ ->
|
|
send_text(StateData,
|
|
xml:element_to_string(?SERR_BAD_FORMAT) ++
|
|
?STREAM_TRAILER),
|
|
?INFO_MSG("Closing s2s connection: ~s -> ~s (bad format)",
|
|
[StateData#state.myname, StateData#state.server]),
|
|
{stop, normal, StateData}
|
|
end;
|
|
_ ->
|
|
?INFO_MSG("Closing s2s connection: ~s -> ~s (bad format)",
|
|
[StateData#state.myname, StateData#state.server]),
|
|
{stop, normal, StateData}
|
|
end;
|
|
|
|
wait_for_starttls_proceed({xmlstreamend, _Name}, StateData) ->
|
|
?INFO_MSG("wait for starttls proceed: xmlstreamend", []),
|
|
{stop, normal, StateData};
|
|
|
|
wait_for_starttls_proceed({xmlstreamerror, _}, StateData) ->
|
|
send_text(StateData,
|
|
?INVALID_XML_ERR ++ ?STREAM_TRAILER),
|
|
?INFO_MSG("wait for starttls proceed: xmlstreamerror", []),
|
|
{stop, normal, StateData};
|
|
|
|
wait_for_starttls_proceed(timeout, StateData) ->
|
|
?INFO_MSG("wait for starttls proceed: timeout", []),
|
|
{stop, normal, StateData};
|
|
|
|
wait_for_starttls_proceed(closed, StateData) ->
|
|
?INFO_MSG("wait for starttls proceed: closed", []),
|
|
{stop, normal, StateData}.
|
|
|
|
|
|
reopen_socket({xmlstreamelement, _El}, StateData) ->
|
|
{next_state, reopen_socket, StateData, ?FSMTIMEOUT};
|
|
reopen_socket({xmlstreamend, _Name}, StateData) ->
|
|
{next_state, reopen_socket, StateData, ?FSMTIMEOUT};
|
|
reopen_socket({xmlstreamerror, _}, StateData) ->
|
|
{next_state, reopen_socket, StateData, ?FSMTIMEOUT};
|
|
reopen_socket(timeout, StateData) ->
|
|
?INFO_MSG("reopen socket: timeout", []),
|
|
{stop, normal, StateData};
|
|
reopen_socket(closed, StateData) ->
|
|
p1_fsm:send_event(self(), init),
|
|
{next_state, open_socket, StateData, ?FSMTIMEOUT}.
|
|
|
|
%% This state is use to avoid reconnecting to often to bad sockets
|
|
wait_before_retry(_Event, StateData) ->
|
|
{next_state, wait_before_retry, StateData, ?FSMTIMEOUT}.
|
|
|
|
stream_established({xmlstreamelement, El}, StateData) ->
|
|
?DEBUG("s2S stream established", []),
|
|
case is_verify_res(El) of
|
|
{verify, VTo, VFrom, VId, VType} ->
|
|
?DEBUG("recv verify: ~p", [{VFrom, VTo, VId, VType}]),
|
|
case StateData#state.verify of
|
|
{VPid, _VKey, _SID} ->
|
|
case VType of
|
|
"valid" ->
|
|
p1_fsm:send_event(
|
|
VPid, {valid,
|
|
StateData#state.server,
|
|
StateData#state.myname});
|
|
_ ->
|
|
p1_fsm:send_event(
|
|
VPid, {invalid,
|
|
StateData#state.server,
|
|
StateData#state.myname})
|
|
end;
|
|
_ ->
|
|
ok
|
|
end;
|
|
_ ->
|
|
ok
|
|
end,
|
|
{next_state, stream_established, StateData};
|
|
|
|
stream_established({xmlstreamend, _Name}, StateData) ->
|
|
?INFO_MSG("Connection closed in stream established: ~s -> ~s (xmlstreamend)",
|
|
[StateData#state.myname, StateData#state.server]),
|
|
{stop, normal, StateData};
|
|
|
|
stream_established({xmlstreamerror, _}, StateData) ->
|
|
send_text(StateData,
|
|
?INVALID_XML_ERR ++ ?STREAM_TRAILER),
|
|
?INFO_MSG("stream established: ~s -> ~s (xmlstreamerror)",
|
|
[StateData#state.myname, StateData#state.server]),
|
|
{stop, normal, StateData};
|
|
|
|
stream_established(timeout, StateData) ->
|
|
?INFO_MSG("stream established: ~s -> ~s (timeout)",
|
|
[StateData#state.myname, StateData#state.server]),
|
|
{stop, normal, StateData};
|
|
|
|
stream_established(closed, StateData) ->
|
|
?INFO_MSG("stream established: ~s -> ~s (closed)",
|
|
[StateData#state.myname, StateData#state.server]),
|
|
{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, get_timeout_interval(StateName)}.
|
|
|
|
%%----------------------------------------------------------------------
|
|
%% Func: handle_sync_event/4
|
|
%% Returns: The associated StateData for this connection
|
|
%% {reply, Reply, NextStateName, NextStateData}
|
|
%% Reply = {state_infos, [{InfoName::atom(), InfoValue::any()]
|
|
%%----------------------------------------------------------------------
|
|
handle_sync_event(get_state_infos, _From, StateName, StateData) ->
|
|
{Addr,Port} = try ejabberd_socket:peername(StateData#state.socket) of
|
|
{ok, {A,P}} -> {A,P};
|
|
{error, _} -> {unknown,unknown}
|
|
catch
|
|
_:_ ->
|
|
{unknown,unknown}
|
|
end,
|
|
Infos = [
|
|
{direction, out},
|
|
{statename, StateName},
|
|
{addr, Addr},
|
|
{port, Port},
|
|
{streamid, StateData#state.streamid},
|
|
{use_v10, StateData#state.use_v10},
|
|
{tls, StateData#state.tls},
|
|
{tls_required, StateData#state.tls_required},
|
|
{tls_enabled, StateData#state.tls_enabled},
|
|
{tls_options, StateData#state.tls_options},
|
|
{authenticated, StateData#state.authenticated},
|
|
{db_enabled, StateData#state.db_enabled},
|
|
{try_auth, StateData#state.try_auth},
|
|
{myname, StateData#state.myname},
|
|
{server, StateData#state.server},
|
|
{delay_to_retry, StateData#state.delay_to_retry},
|
|
{verify, StateData#state.verify}
|
|
],
|
|
Reply = {state_infos, Infos},
|
|
{reply,Reply,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, get_timeout_interval(StateName)}.
|
|
|
|
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, Text),
|
|
cancel_timer(StateData#state.timer),
|
|
Timer = erlang:start_timer(?S2STIMEOUT, self(), []),
|
|
{next_state, StateName, StateData#state{timer = Timer},
|
|
get_timeout_interval(StateName)};
|
|
|
|
handle_info({send_element, El}, StateName, StateData) ->
|
|
case StateName of
|
|
stream_established ->
|
|
cancel_timer(StateData#state.timer),
|
|
Timer = erlang:start_timer(?S2STIMEOUT, self(), []),
|
|
send_element(StateData, El),
|
|
{next_state, StateName, StateData#state{timer = Timer}};
|
|
%% In this state we bounce all message: We are waiting before
|
|
%% trying to reconnect
|
|
wait_before_retry ->
|
|
bounce_element(El, ?ERR_REMOTE_SERVER_NOT_FOUND),
|
|
{next_state, StateName, StateData};
|
|
_ ->
|
|
Q = queue:in(El, StateData#state.queue),
|
|
{next_state, StateName, StateData#state{queue = Q},
|
|
get_timeout_interval(StateName)}
|
|
end;
|
|
|
|
handle_info({timeout, Timer, _}, wait_before_retry,
|
|
#state{timer = Timer} = StateData) ->
|
|
?INFO_MSG("Reconnect delay expired: Will now retry to connect to ~s when needed.", [StateData#state.server]),
|
|
{stop, normal, StateData};
|
|
|
|
handle_info({timeout, Timer, _}, _StateName,
|
|
#state{timer = Timer} = StateData) ->
|
|
?INFO_MSG("Closing connection with ~s: timeout", [StateData#state.server]),
|
|
{stop, normal, StateData};
|
|
|
|
handle_info(terminate_if_waiting_before_retry, wait_before_retry, StateData) ->
|
|
{stop, normal, StateData};
|
|
|
|
handle_info(terminate_if_waiting_before_retry, StateName, StateData) ->
|
|
{next_state, StateName, StateData, get_timeout_interval(StateName)};
|
|
|
|
handle_info(_, StateName, StateData) ->
|
|
{next_state, StateName, StateData, get_timeout_interval(StateName)}.
|
|
|
|
%%----------------------------------------------------------------------
|
|
%% Func: terminate/3
|
|
%% Purpose: Shutdown the fsm
|
|
%% Returns: any
|
|
%%----------------------------------------------------------------------
|
|
terminate(Reason, StateName, StateData) ->
|
|
?DEBUG("terminated: ~p", [{Reason, StateName}]),
|
|
case StateData#state.new of
|
|
false ->
|
|
ok;
|
|
Key ->
|
|
ejabberd_s2s:remove_connection(
|
|
{StateData#state.myname, StateData#state.server}, self(), Key)
|
|
end,
|
|
%% bounce queue manage by process and Erlang message queue
|
|
bounce_queue(StateData#state.queue, ?ERR_REMOTE_SERVER_NOT_FOUND),
|
|
bounce_messages(?ERR_REMOTE_SERVER_NOT_FOUND),
|
|
case StateData#state.socket of
|
|
undefined ->
|
|
ok;
|
|
_Socket ->
|
|
ejabberd_socket:close(StateData#state.socket)
|
|
end,
|
|
ok.
|
|
|
|
%%----------------------------------------------------------------------
|
|
%% Func: print_state/1
|
|
%% Purpose: Prepare the state to be printed on error log
|
|
%% Returns: State to print
|
|
%%----------------------------------------------------------------------
|
|
print_state(State) ->
|
|
State.
|
|
|
|
%%%----------------------------------------------------------------------
|
|
%%% Internal functions
|
|
%%%----------------------------------------------------------------------
|
|
|
|
send_text(StateData, Text) ->
|
|
ejabberd_socket:send(StateData#state.socket, Text).
|
|
|
|
send_element(StateData, El) ->
|
|
send_text(StateData, xml:element_to_binary(El)).
|
|
|
|
send_queue(StateData, Q) ->
|
|
case queue:out(Q) of
|
|
{{value, El}, Q1} ->
|
|
send_element(StateData, El),
|
|
send_queue(StateData, Q1);
|
|
{empty, _Q1} ->
|
|
ok
|
|
end.
|
|
|
|
%% Bounce a single message (xmlelement)
|
|
bounce_element(El, Error) ->
|
|
{xmlelement, _Name, Attrs, _SubTags} = El,
|
|
case xml:get_attr_s("type", Attrs) of
|
|
"error" -> ok;
|
|
"result" -> ok;
|
|
_ ->
|
|
Err = jlib:make_error_reply(El, Error),
|
|
From = jlib:string_to_jid(xml:get_tag_attr_s("from", El)),
|
|
To = jlib:string_to_jid(xml:get_tag_attr_s("to", El)),
|
|
ejabberd_router:route(To, From, Err)
|
|
end.
|
|
|
|
bounce_queue(Q, Error) ->
|
|
case queue:out(Q) of
|
|
{{value, El}, Q1} ->
|
|
bounce_element(El, Error),
|
|
bounce_queue(Q1, Error);
|
|
{empty, _} ->
|
|
ok
|
|
end.
|
|
|
|
new_id() ->
|
|
randoms:get_string().
|
|
|
|
cancel_timer(Timer) ->
|
|
erlang:cancel_timer(Timer),
|
|
receive
|
|
{timeout, Timer, _} ->
|
|
ok
|
|
after 0 ->
|
|
ok
|
|
end.
|
|
|
|
bounce_messages(Error) ->
|
|
receive
|
|
{send_element, El} ->
|
|
bounce_element(El, Error),
|
|
bounce_messages(Error)
|
|
after 0 ->
|
|
ok
|
|
end.
|
|
|
|
|
|
send_db_request(StateData) ->
|
|
Server = StateData#state.server,
|
|
New = case StateData#state.new of
|
|
false ->
|
|
case ejabberd_s2s:try_register(
|
|
{StateData#state.myname, Server}) of
|
|
{key, Key} ->
|
|
Key;
|
|
false ->
|
|
false
|
|
end;
|
|
Key ->
|
|
Key
|
|
end,
|
|
NewStateData = StateData#state{new = New},
|
|
try
|
|
case New of
|
|
false ->
|
|
ok;
|
|
Key1 ->
|
|
send_element(StateData,
|
|
{xmlelement,
|
|
"db:result",
|
|
[{"from", StateData#state.myname},
|
|
{"to", Server}],
|
|
[{xmlcdata, Key1}]})
|
|
end,
|
|
case StateData#state.verify of
|
|
false ->
|
|
ok;
|
|
{_Pid, Key2, SID} ->
|
|
send_element(StateData,
|
|
{xmlelement,
|
|
"db:verify",
|
|
[{"from", StateData#state.myname},
|
|
{"to", StateData#state.server},
|
|
{"id", SID}],
|
|
[{xmlcdata, Key2}]})
|
|
end,
|
|
{next_state, wait_for_validation, NewStateData, ?FSMTIMEOUT*6}
|
|
catch
|
|
_:_ ->
|
|
{stop, normal, NewStateData}
|
|
end.
|
|
|
|
|
|
is_verify_res({xmlelement, Name, Attrs, _Els}) when Name == "db:result" ->
|
|
{result,
|
|
xml:get_attr_s("to", Attrs),
|
|
xml:get_attr_s("from", Attrs),
|
|
xml:get_attr_s("id", Attrs),
|
|
xml:get_attr_s("type", Attrs)};
|
|
is_verify_res({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_attr_s("type", Attrs)};
|
|
is_verify_res(_) ->
|
|
false.
|
|
|
|
|
|
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
%% SRV support
|
|
|
|
-include_lib("kernel/include/inet.hrl").
|
|
|
|
get_addr_port(Server) ->
|
|
Res = srv_lookup(Server),
|
|
case Res of
|
|
{error, Reason} ->
|
|
?DEBUG("srv lookup of '~s' failed: ~p~n", [Server, Reason]),
|
|
[{Server, outgoing_s2s_port()}];
|
|
{ok, HEnt} ->
|
|
?DEBUG("srv lookup of '~s': ~p~n",
|
|
[Server, HEnt#hostent.h_addr_list]),
|
|
case HEnt#hostent.h_addr_list of
|
|
[] ->
|
|
[{Server, outgoing_s2s_port()}];
|
|
AddrList ->
|
|
%% Probabilities are not exactly proportional to weights
|
|
%% for simplicity (higher weigths are overvalued)
|
|
{A1, A2, A3} = now(),
|
|
random:seed(A1, A2, A3),
|
|
case (catch lists:map(
|
|
fun({Priority, Weight, Port, Host}) ->
|
|
N = case Weight of
|
|
0 -> 0;
|
|
_ -> (Weight + 1) * random:uniform()
|
|
end,
|
|
{Priority * 65536 - N, Host, Port}
|
|
end, AddrList)) of
|
|
{'EXIT', _Reason} ->
|
|
[{Server, outgoing_s2s_port()}];
|
|
SortedList ->
|
|
List = lists:map(
|
|
fun({_, Host, Port}) ->
|
|
{Host, Port}
|
|
end, lists:keysort(1, SortedList)),
|
|
?DEBUG("srv lookup of '~s': ~p~n", [Server, List]),
|
|
List
|
|
end
|
|
end
|
|
end.
|
|
|
|
srv_lookup(Server) ->
|
|
Options = case ejabberd_config:get_local_option(s2s_dns_options) of
|
|
L when is_list(L) -> L;
|
|
_ -> []
|
|
end,
|
|
TimeoutMs = timer:seconds(proplists:get_value(timeout, Options, 10)),
|
|
Retries = proplists:get_value(retries, Options, 2),
|
|
srv_lookup(Server, TimeoutMs, Retries).
|
|
|
|
%% XXX - this behaviour is suboptimal in the case that the domain
|
|
%% has a "_xmpp-server._tcp." but not a "_jabber._tcp." record and
|
|
%% we don't get a DNS reply for the "_xmpp-server._tcp." lookup. In this
|
|
%% case we'll give up when we get the "_jabber._tcp." nxdomain reply.
|
|
srv_lookup(_Server, _Timeout, Retries) when Retries < 1 ->
|
|
{error, timeout};
|
|
srv_lookup(Server, Timeout, Retries) ->
|
|
case inet_res:getbyname("_xmpp-server._tcp." ++ Server, srv, Timeout) of
|
|
{error, _Reason} ->
|
|
case inet_res:getbyname("_jabber._tcp." ++ Server, srv, Timeout) of
|
|
{error, timeout} ->
|
|
?ERROR_MSG("The DNS servers~n ~p~ntimed out on request"
|
|
" for ~p IN SRV."
|
|
" You should check your DNS configuration.",
|
|
[inet_db:res_option(nameserver), Server]),
|
|
srv_lookup(Server, Timeout, Retries - 1);
|
|
R -> R
|
|
end;
|
|
{ok, _HEnt} = R -> R
|
|
end.
|
|
|
|
test_get_addr_port(Server) ->
|
|
lists:foldl(
|
|
fun(_, Acc) ->
|
|
[HostPort | _] = get_addr_port(Server),
|
|
case lists:keysearch(HostPort, 1, Acc) of
|
|
false ->
|
|
[{HostPort, 1} | Acc];
|
|
{value, {_, Num}} ->
|
|
lists:keyreplace(HostPort, 1, Acc, {HostPort, Num + 1})
|
|
end
|
|
end, [], lists:seq(1, 100000)).
|
|
|
|
get_addrs(Host, Family) ->
|
|
Type = case Family of
|
|
inet4 -> inet;
|
|
ipv4 -> inet;
|
|
inet6 -> inet6;
|
|
ipv6 -> inet6
|
|
end,
|
|
case inet:gethostbyname(Host, Type) of
|
|
{ok, #hostent{h_addr_list = Addrs}} ->
|
|
?DEBUG("~s of ~s resolved to: ~p~n", [Type, Host, Addrs]),
|
|
Addrs;
|
|
{error, Reason} ->
|
|
?DEBUG("~s lookup of '~s' failed: ~p~n", [Type, Host, Reason]),
|
|
[]
|
|
end.
|
|
|
|
|
|
outgoing_s2s_port() ->
|
|
case ejabberd_config:get_local_option(outgoing_s2s_port) of
|
|
Port when is_integer(Port) ->
|
|
Port;
|
|
undefined ->
|
|
5269
|
|
end.
|
|
|
|
outgoing_s2s_families() ->
|
|
case ejabberd_config:get_local_option(outgoing_s2s_options) of
|
|
{Families, _} when is_list(Families) ->
|
|
Families;
|
|
undefined ->
|
|
%% DISCUSSION: Why prefer IPv4 first?
|
|
%%
|
|
%% IPv4 connectivity will be available for everyone for
|
|
%% many years to come. So, there's absolutely no benefit
|
|
%% in preferring IPv6 connections which are flaky at best
|
|
%% nowadays.
|
|
%%
|
|
%% On the other hand content providers hesitate putting up
|
|
%% AAAA records for their sites due to the mentioned
|
|
%% quality of current IPv6 connectivity. Making IPv6 the a
|
|
%% `fallback' may avoid these problems elegantly.
|
|
[ipv4, ipv6]
|
|
end.
|
|
|
|
outgoing_s2s_timeout() ->
|
|
case ejabberd_config:get_local_option(outgoing_s2s_options) of
|
|
{_, Timeout} when is_integer(Timeout) ->
|
|
Timeout;
|
|
{_, infinity} ->
|
|
infinity;
|
|
undefined ->
|
|
%% 10 seconds
|
|
10000
|
|
end.
|
|
|
|
%% Human readable S2S logging: Log only new outgoing connections as INFO
|
|
%% Do not log dialback
|
|
log_s2s_out(false, _, _, _) -> ok;
|
|
%% Log new outgoing connections:
|
|
log_s2s_out(_, Myname, Server, Tls) ->
|
|
?INFO_MSG("Trying to open s2s connection: ~s -> ~s with TLS=~p", [Myname, Server, Tls]).
|
|
|
|
%% Calculate timeout depending on which state we are in:
|
|
%% Can return integer > 0 | infinity
|
|
get_timeout_interval(StateName) ->
|
|
case StateName of
|
|
%% Validation implies dialback: Networking can take longer:
|
|
wait_for_validation ->
|
|
?FSMTIMEOUT*6;
|
|
%% When stream is established, we only rely on S2S Timeout timer:
|
|
stream_established ->
|
|
infinity;
|
|
_ ->
|
|
?FSMTIMEOUT
|
|
end.
|
|
|
|
%% This function is intended to be called at the end of a state
|
|
%% function that want to wait for a reconnect delay before stopping.
|
|
wait_before_reconnect(StateData) ->
|
|
%% bounce queue manage by process and Erlang message queue
|
|
bounce_queue(StateData#state.queue, ?ERR_REMOTE_SERVER_NOT_FOUND),
|
|
bounce_messages(?ERR_REMOTE_SERVER_NOT_FOUND),
|
|
cancel_timer(StateData#state.timer),
|
|
Delay = case StateData#state.delay_to_retry of
|
|
undefined_delay ->
|
|
%% The initial delay is random between 1 and 15 seconds
|
|
%% Return a random integer between 1000 and 15000
|
|
{_, _, MicroSecs} = now(),
|
|
(MicroSecs rem 14000) + 1000;
|
|
D1 ->
|
|
%% Duplicate the delay with each successive failed
|
|
%% reconnection attempt, but don't exceed the max
|
|
lists:min([D1 * 2, get_max_retry_delay()])
|
|
end,
|
|
Timer = erlang:start_timer(Delay, self(), []),
|
|
{next_state, wait_before_retry, StateData#state{timer=Timer,
|
|
delay_to_retry = Delay,
|
|
queue = queue:new()}}.
|
|
|
|
%% @doc Get the maximum allowed delay for retry to reconnect (in miliseconds).
|
|
%% The default value is 5 minutes.
|
|
%% The option {s2s_max_retry_delay, Seconds} can be used (in seconds).
|
|
%% @spec () -> integer()
|
|
get_max_retry_delay() ->
|
|
case ejabberd_config:get_local_option(s2s_max_retry_delay) of
|
|
Seconds when is_integer(Seconds) ->
|
|
Seconds*1000;
|
|
_ ->
|
|
?MAX_RETRY_DELAY
|
|
end.
|
|
|
|
%% Terminate s2s_out connections that are in state wait_before_retry
|
|
terminate_if_waiting_delay(From, To) ->
|
|
FromTo = {From, To},
|
|
Pids = ejabberd_s2s:get_connections_pids(FromTo),
|
|
lists:foreach(
|
|
fun(Pid) ->
|
|
Pid ! terminate_if_waiting_before_retry
|
|
end,
|
|
Pids).
|
|
|
|
fsm_limit_opts() ->
|
|
case ejabberd_config:get_local_option(max_fsm_queue) of
|
|
N when is_integer(N) ->
|
|
[{max_queue, N}];
|
|
_ ->
|
|
[]
|
|
end.
|