mirror of
https://github.com/processone/ejabberd.git
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03817de827
Using monitors instead of doint that from terminate() makes us immune to s2s handler processes being forcefully killed.
417 lines
14 KiB
Erlang
417 lines
14 KiB
Erlang
%%%-------------------------------------------------------------------
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%%% Created : 16 Dec 2016 by Evgeny Khramtsov <ekhramtsov@process-one.net>
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%%%
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%%%
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%%% ejabberd, Copyright (C) 2002-2021 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 along
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%%% with this program; if not, write to the Free Software Foundation, Inc.,
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%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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%%%
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%%%-------------------------------------------------------------------
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-module(ejabberd_s2s_out).
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-behaviour(xmpp_stream_out).
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%% xmpp_stream_out callbacks
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-export([tls_options/1, tls_required/1, tls_verify/1, tls_enabled/1,
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connect_options/3, connect_timeout/1, address_families/1, default_port/1,
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dns_retries/1, dns_timeout/1,
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handle_auth_success/2, handle_auth_failure/3, handle_packet/2,
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handle_stream_end/2, handle_stream_downgraded/2,
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handle_recv/3, handle_send/3, handle_cdata/2,
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handle_stream_established/1, handle_timeout/1]).
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-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
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terminate/2, code_change/3]).
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%% Hooks
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-export([process_auth_result/2, process_closed/2, handle_unexpected_info/2,
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handle_unexpected_cast/2, process_downgraded/2]).
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%% API
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-export([start/3, start_link/3, connect/1, close/1, close/2, stop_async/1, send/2,
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route/2, establish/1, update_state/2, host_up/1, host_down/1]).
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-include_lib("xmpp/include/xmpp.hrl").
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-include("logger.hrl").
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-include("translate.hrl").
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-type state() :: xmpp_stream_out:state().
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-export_type([state/0]).
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%%%===================================================================
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%%% API
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%%%===================================================================
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start(From, To, Opts) ->
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case proplists:get_value(supervisor, Opts, true) of
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true ->
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case supervisor:start_child(ejabberd_s2s_out_sup,
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[From, To, Opts]) of
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{ok, undefined} -> ignore;
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Res -> Res
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end;
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_ ->
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xmpp_stream_out:start(?MODULE, [From, To, Opts],
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ejabberd_config:fsm_limit_opts([]))
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end.
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start_link(From, To, Opts) ->
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xmpp_stream_out:start_link(?MODULE, [From, To, Opts],
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ejabberd_config:fsm_limit_opts([])).
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-spec connect(pid()) -> ok.
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connect(Ref) ->
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xmpp_stream_out:connect(Ref).
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-spec close(pid()) -> ok;
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(state()) -> state().
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close(Ref) ->
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xmpp_stream_out:close(Ref).
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-spec close(pid(), atom()) -> ok.
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close(Ref, Reason) ->
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xmpp_stream_out:close(Ref, Reason).
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-spec stop_async(pid()) -> ok.
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stop_async(Pid) ->
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xmpp_stream_out:stop_async(Pid).
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-spec send(pid(), xmpp_element()) -> ok;
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(state(), xmpp_element()) -> state().
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send(Stream, Pkt) ->
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xmpp_stream_out:send(Stream, Pkt).
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-spec route(pid(), xmpp_element()) -> ok.
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route(Ref, Pkt) ->
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Ref ! {route, Pkt},
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ok.
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-spec establish(state()) -> state().
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establish(State) ->
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xmpp_stream_out:establish(State).
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-spec update_state(pid(), fun((state()) -> state()) |
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{module(), atom(), list()}) -> ok.
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update_state(Ref, Callback) ->
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xmpp_stream_out:cast(Ref, {update_state, Callback}).
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-spec host_up(binary()) -> ok.
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host_up(Host) ->
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ejabberd_hooks:add(s2s_out_auth_result, Host, ?MODULE,
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process_auth_result, 100),
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ejabberd_hooks:add(s2s_out_closed, Host, ?MODULE,
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process_closed, 100),
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ejabberd_hooks:add(s2s_out_handle_info, Host, ?MODULE,
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handle_unexpected_info, 100),
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ejabberd_hooks:add(s2s_out_handle_cast, Host, ?MODULE,
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handle_unexpected_cast, 100),
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ejabberd_hooks:add(s2s_out_downgraded, Host, ?MODULE,
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process_downgraded, 100).
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-spec host_down(binary()) -> ok.
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host_down(Host) ->
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ejabberd_hooks:delete(s2s_out_auth_result, Host, ?MODULE,
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process_auth_result, 100),
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ejabberd_hooks:delete(s2s_out_closed, Host, ?MODULE,
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process_closed, 100),
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ejabberd_hooks:delete(s2s_out_handle_info, Host, ?MODULE,
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handle_unexpected_info, 100),
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ejabberd_hooks:delete(s2s_out_handle_cast, Host, ?MODULE,
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handle_unexpected_cast, 100),
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ejabberd_hooks:delete(s2s_out_downgraded, Host, ?MODULE,
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process_downgraded, 100).
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%%%===================================================================
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%%% Hooks
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%%%===================================================================
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process_auth_result(#{server := LServer, remote_server := RServer} = State,
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{false, Reason}) ->
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Delay = get_delay(),
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?WARNING_MSG("Failed to establish outbound s2s connection ~ts -> ~ts: "
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"authentication failed; bouncing for ~p seconds",
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[LServer, RServer, Delay div 1000]),
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State1 = State#{on_route => bounce, stop_reason => Reason},
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State2 = close(State1),
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State3 = bounce_queue(State2),
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xmpp_stream_out:set_timeout(State3, Delay);
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process_auth_result(State, true) ->
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State.
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process_closed(#{server := LServer, remote_server := RServer,
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on_route := send} = State,
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Reason) ->
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?INFO_MSG("Closing outbound s2s connection ~ts -> ~ts: ~ts",
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[LServer, RServer, format_error(Reason)]),
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stop_async(self()),
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State;
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process_closed(#{server := LServer, remote_server := RServer} = State,
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Reason) ->
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Delay = get_delay(),
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?WARNING_MSG("Failed to establish outbound s2s connection ~ts -> ~ts: ~ts; "
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"bouncing for ~p seconds",
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[LServer, RServer, format_error(Reason), Delay div 1000]),
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State1 = State#{on_route => bounce},
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State2 = bounce_queue(State1),
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xmpp_stream_out:set_timeout(State2, Delay).
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handle_unexpected_info(State, Info) ->
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?WARNING_MSG("Unexpected info: ~p", [Info]),
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State.
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handle_unexpected_cast(State, Msg) ->
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?WARNING_MSG("Unexpected cast: ~p", [Msg]),
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State.
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process_downgraded(State, _StreamStart) ->
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send(State, xmpp:serr_unsupported_version()).
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%%%===================================================================
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%%% xmpp_stream_out callbacks
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%%%===================================================================
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tls_options(#{server := LServer, server_host := ServerHost}) ->
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ejabberd_s2s:tls_options(LServer, ServerHost, []).
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tls_required(#{server_host := ServerHost}) ->
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ejabberd_s2s:tls_required(ServerHost).
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tls_verify(#{server_host := ServerHost} = State) ->
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ejabberd_hooks:run_fold(s2s_out_tls_verify, ServerHost, true, [State]).
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tls_enabled(#{server_host := ServerHost}) ->
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ejabberd_s2s:tls_enabled(ServerHost).
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connect_options(Addr, Opts, #{server_host := ServerHost}) ->
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BindAddr = case get_addr_type(Addr) of
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inet ->
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ejabberd_option:outgoing_s2s_ipv4_address(ServerHost);
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inet6 ->
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ejabberd_option:outgoing_s2s_ipv6_address(ServerHost)
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end,
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case BindAddr of
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undefined ->
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Opts;
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_ ->
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[{ip, BindAddr} | Opts]
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end.
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connect_timeout(#{server_host := ServerHost}) ->
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ejabberd_option:outgoing_s2s_timeout(ServerHost).
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default_port(#{server_host := ServerHost}) ->
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ejabberd_option:outgoing_s2s_port(ServerHost).
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address_families(#{server_host := ServerHost}) ->
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ejabberd_option:outgoing_s2s_families(ServerHost).
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dns_retries(#{server_host := ServerHost}) ->
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ejabberd_option:s2s_dns_retries(ServerHost).
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dns_timeout(#{server_host := ServerHost}) ->
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ejabberd_option:s2s_dns_timeout(ServerHost).
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handle_auth_success(Mech, #{socket := Socket, ip := IP,
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remote_server := RServer,
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server_host := ServerHost,
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server := LServer} = State) ->
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?INFO_MSG("(~ts) Accepted outbound s2s ~ts authentication ~ts -> ~ts (~ts)",
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[xmpp_socket:pp(Socket), Mech, LServer, RServer,
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ejabberd_config:may_hide_data(misc:ip_to_list(IP))]),
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ejabberd_hooks:run_fold(s2s_out_auth_result, ServerHost, State, [true]).
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handle_auth_failure(Mech, Reason,
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#{socket := Socket, ip := IP,
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remote_server := RServer,
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server_host := ServerHost,
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server := LServer} = State) ->
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?WARNING_MSG("(~ts) Failed outbound s2s ~ts authentication ~ts -> ~ts (~ts): ~ts",
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[xmpp_socket:pp(Socket), Mech, LServer, RServer,
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ejabberd_config:may_hide_data(misc:ip_to_list(IP)),
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xmpp_stream_out:format_error(Reason)]),
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ejabberd_hooks:run_fold(s2s_out_auth_result, ServerHost, State, [{false, Reason}]).
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handle_packet(Pkt, #{server_host := ServerHost} = State) ->
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ejabberd_hooks:run_fold(s2s_out_packet, ServerHost, State, [Pkt]).
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handle_stream_end(Reason, #{server_host := ServerHost} = State) ->
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State1 = State#{stop_reason => Reason},
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ejabberd_hooks:run_fold(s2s_out_closed, ServerHost, State1, [Reason]).
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handle_stream_downgraded(StreamStart, #{server_host := ServerHost} = State) ->
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ejabberd_hooks:run_fold(s2s_out_downgraded, ServerHost, State, [StreamStart]).
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handle_stream_established(State) ->
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State1 = State#{on_route => send},
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State2 = resend_queue(State1),
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set_idle_timeout(State2).
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handle_cdata(Data, #{server_host := ServerHost} = State) ->
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ejabberd_hooks:run_fold(s2s_out_handle_cdata, ServerHost, State, [Data]).
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handle_recv(El, Pkt, #{server_host := ServerHost} = State) ->
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ejabberd_hooks:run_fold(s2s_out_handle_recv, ServerHost, State, [El, Pkt]).
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handle_send(El, Pkt, #{server_host := ServerHost} = State) ->
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ejabberd_hooks:run_fold(s2s_out_handle_send, ServerHost, State, [El, Pkt]).
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handle_timeout(#{on_route := Action, lang := Lang} = State) ->
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case Action of
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bounce ->
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stop_async(self()),
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State;
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_ ->
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Txt = ?T("Idle connection"),
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send(State, xmpp:serr_connection_timeout(Txt, Lang))
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end.
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init([#{server := LServer, remote_server := RServer} = State, Opts]) ->
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ServerHost = ejabberd_router:host_of_route(LServer),
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QueueType = ejabberd_s2s:queue_type(ServerHost),
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QueueLimit = case lists:keyfind(
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max_queue, 1, ejabberd_config:fsm_limit_opts([])) of
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{_, N} -> N;
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false -> unlimited
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end,
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Timeout = ejabberd_option:negotiation_timeout(),
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State1 = State#{on_route => queue,
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queue => p1_queue:new(QueueType, QueueLimit),
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xmlns => ?NS_SERVER,
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lang => ejabberd_option:language(),
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server_host => ServerHost,
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shaper => none},
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State2 = xmpp_stream_out:set_timeout(State1, Timeout),
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?INFO_MSG("Outbound s2s connection started: ~ts -> ~ts",
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[LServer, RServer]),
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ejabberd_hooks:run_fold(s2s_out_init, ServerHost, {ok, State2}, [Opts]).
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handle_call(Request, From, #{server_host := ServerHost} = State) ->
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ejabberd_hooks:run_fold(s2s_out_handle_call, ServerHost, State, [Request, From]).
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handle_cast({update_state, Fun}, State) ->
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case Fun of
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{M, F, A} -> erlang:apply(M, F, [State|A]);
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_ when is_function(Fun) -> Fun(State)
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end;
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handle_cast(Msg, #{server_host := ServerHost} = State) ->
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ejabberd_hooks:run_fold(s2s_out_handle_cast, ServerHost, State, [Msg]).
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handle_info({route, Pkt}, #{queue := Q, on_route := Action} = State) ->
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case Action of
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queue ->
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try State#{queue => p1_queue:in(Pkt, Q)}
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catch error:full ->
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Q1 = p1_queue:set_limit(Q, unlimited),
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Q2 = p1_queue:in(Pkt, Q1),
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handle_stream_end(queue_full, State#{queue => Q2})
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end;
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bounce -> bounce_packet(Pkt, State);
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send -> set_idle_timeout(send(State, Pkt))
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end;
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handle_info(Info, #{server_host := ServerHost} = State) ->
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ejabberd_hooks:run_fold(s2s_out_handle_info, ServerHost, State, [Info]).
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terminate(Reason, #{server := LServer,
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remote_server := RServer} = State) ->
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State1 = case Reason of
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normal -> State;
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_ -> State#{stop_reason => internal_failure}
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end,
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State2 = bounce_queue(State1),
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bounce_message_queue({LServer, RServer}, State2).
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code_change(_OldVsn, State, _Extra) ->
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{ok, State}.
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%%%===================================================================
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%%% Internal functions
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%%%===================================================================
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-spec get_addr_type(inet:ip_address()) -> inet:address_family().
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get_addr_type({_, _, _, _}) -> inet;
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get_addr_type({_, _, _, _, _, _, _, _}) -> inet6.
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-spec resend_queue(state()) -> state().
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resend_queue(State) ->
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queue_fold(
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fun(Pkt, AccState) ->
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send(AccState, Pkt)
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end, State).
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-spec bounce_queue(state()) -> state().
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bounce_queue(State) ->
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queue_fold(
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fun(Pkt, AccState) ->
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bounce_packet(Pkt, AccState)
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end, State).
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-spec bounce_message_queue({binary(), binary()}, state()) -> state().
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bounce_message_queue(FromTo, State) ->
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receive {route, Pkt} ->
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State1 = bounce_packet(Pkt, State),
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bounce_message_queue(FromTo, State1)
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after 0 ->
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State
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end.
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-spec bounce_packet(xmpp_element(), state()) -> state().
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bounce_packet(Pkt, State) when ?is_stanza(Pkt) ->
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Lang = xmpp:get_lang(Pkt),
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Err = mk_bounce_error(Lang, State),
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ejabberd_router:route_error(Pkt, Err),
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State;
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bounce_packet(_, State) ->
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State.
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-spec mk_bounce_error(binary(), state()) -> stanza_error().
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mk_bounce_error(Lang, #{stop_reason := Why}) ->
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Reason = format_error(Why),
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case Why of
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internal_failure ->
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xmpp:err_internal_server_error(Reason, Lang);
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queue_full ->
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xmpp:err_resource_constraint(Reason, Lang);
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{dns, _} ->
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xmpp:err_remote_server_not_found(Reason, Lang);
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{idna, _} ->
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xmpp:err_remote_server_not_found(Reason, Lang);
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_ ->
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xmpp:err_remote_server_timeout(Reason, Lang)
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end;
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mk_bounce_error(_Lang, _State) ->
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%% We should not be here. Probably :)
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xmpp:err_remote_server_not_found().
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-spec get_delay() -> non_neg_integer().
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get_delay() ->
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MaxDelay = ejabberd_option:s2s_max_retry_delay(),
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p1_rand:uniform(MaxDelay).
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-spec set_idle_timeout(state()) -> state().
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set_idle_timeout(#{on_route := send, server_host := ServerHost} = State) ->
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Timeout = ejabberd_s2s:get_idle_timeout(ServerHost),
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xmpp_stream_out:set_timeout(State, Timeout);
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set_idle_timeout(State) ->
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State.
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-spec queue_fold(fun((xmpp_element(), state()) -> state()), state()) -> state().
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queue_fold(F, #{queue := Q} = State) ->
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case p1_queue:out(Q) of
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{{value, Pkt}, Q1} ->
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State1 = F(Pkt, State#{queue => Q1}),
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queue_fold(F, State1);
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{empty, Q1} ->
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State#{queue => Q1}
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end.
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format_error(internal_failure) ->
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<<"Internal server error">>;
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format_error(queue_full) ->
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<<"Stream queue is overloaded">>;
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format_error(Reason) ->
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xmpp_stream_out:format_error(Reason).
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