mirror of
https://github.com/processone/ejabberd.git
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647 lines
20 KiB
Erlang
647 lines
20 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : ejabberd_s2s.erl
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%%% Author : Alexey Shchepin <alexey@process-one.net>
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%%% Purpose : S2S connections manager
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%%% Created : 7 Dec 2002 by Alexey Shchepin <alexey@process-one.net>
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%%%
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%%%
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%%% ejabberd, Copyright (C) 2002-2019 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).
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-protocol({xep, 220, '1.1'}).
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-author('alexey@process-one.net').
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-behaviour(gen_server).
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%% API
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-export([start_link/0, route/1, have_connection/1,
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get_connections_pids/1, try_register/1,
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remove_connection/2, start_connection/2, start_connection/3,
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dirty_get_connections/0, allow_host/2,
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incoming_s2s_number/0, outgoing_s2s_number/0,
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stop_s2s_connections/0,
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clean_temporarily_blocked_table/0,
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list_temporarily_blocked_hosts/0,
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external_host_overloaded/1, is_temporarly_blocked/1,
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get_commands_spec/0, zlib_enabled/1, get_idle_timeout/1,
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tls_required/1, tls_enabled/1, tls_options/2,
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host_up/1, host_down/1, queue_type/1]).
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%% gen_server callbacks
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-export([init/1, handle_call/3, handle_cast/2,
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handle_info/2, terminate/2, code_change/3]).
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-export([get_info_s2s_connections/1]).
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-include("logger.hrl").
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-include("xmpp.hrl").
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-include("ejabberd_commands.hrl").
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-include_lib("public_key/include/public_key.hrl").
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-include("ejabberd_stacktrace.hrl").
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-define(PKIXEXPLICIT, 'OTP-PUB-KEY').
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-define(PKIXIMPLICIT, 'OTP-PUB-KEY').
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-include("XmppAddr.hrl").
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-define(DEFAULT_MAX_S2S_CONNECTIONS_NUMBER, 1).
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-define(DEFAULT_MAX_S2S_CONNECTIONS_NUMBER_PER_NODE, 1).
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-define(S2S_OVERLOAD_BLOCK_PERIOD, 60).
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%% once a server is temporarly blocked, it stay blocked for 60 seconds
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-record(s2s, {fromto = {<<"">>, <<"">>} :: {binary(), binary()} | '_',
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pid = self() :: pid() | '_' | '$1'}).
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-record(state, {}).
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-record(temporarily_blocked, {host = <<"">> :: binary(),
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timestamp :: integer()}).
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-type temporarily_blocked() :: #temporarily_blocked{}.
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start_link() ->
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gen_server:start_link({local, ?MODULE}, ?MODULE, [],
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[]).
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-spec route(stanza()) -> ok.
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route(Packet) ->
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try do_route(Packet)
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catch ?EX_RULE(E, R, St) ->
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?ERROR_MSG("failed to route packet:~n~s~nReason = ~p",
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[xmpp:pp(Packet), {E, {R, ?EX_STACK(St)}}])
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end.
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clean_temporarily_blocked_table() ->
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mnesia:clear_table(temporarily_blocked).
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-spec list_temporarily_blocked_hosts() -> [temporarily_blocked()].
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list_temporarily_blocked_hosts() ->
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ets:tab2list(temporarily_blocked).
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-spec external_host_overloaded(binary()) -> {aborted, any()} | {atomic, ok}.
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external_host_overloaded(Host) ->
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?INFO_MSG("Disabling connections from ~s for ~p "
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"seconds",
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[Host, ?S2S_OVERLOAD_BLOCK_PERIOD]),
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mnesia:transaction(fun () ->
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Time = erlang:monotonic_time(),
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mnesia:write(#temporarily_blocked{host = Host,
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timestamp = Time})
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end).
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-spec is_temporarly_blocked(binary()) -> boolean().
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is_temporarly_blocked(Host) ->
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case mnesia:dirty_read(temporarily_blocked, Host) of
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[] -> false;
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[#temporarily_blocked{timestamp = T} = Entry] ->
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Diff = erlang:monotonic_time() - T,
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case erlang:convert_time_unit(Diff, native, microsecond) of
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N when N > (?S2S_OVERLOAD_BLOCK_PERIOD) * 1000 * 1000 ->
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mnesia:dirty_delete_object(Entry), false;
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_ -> true
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end
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end.
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-spec remove_connection({binary(), binary()}, pid()) -> ok.
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remove_connection(FromTo, Pid) ->
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case mnesia:dirty_match_object(s2s, #s2s{fromto = FromTo, pid = Pid}) of
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[#s2s{pid = Pid}] ->
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F = fun() ->
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mnesia:delete_object(#s2s{fromto = FromTo, pid = Pid})
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end,
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case mnesia:transaction(F) of
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{atomic, _} -> ok;
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{aborted, Reason} ->
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?ERROR_MSG("Failed to unregister s2s connection: "
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"Mnesia failure: ~p", [Reason])
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end;
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_ ->
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ok
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end.
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-spec have_connection({binary(), binary()}) -> boolean().
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have_connection(FromTo) ->
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case catch mnesia:dirty_read(s2s, FromTo) of
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[_] ->
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true;
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_ ->
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false
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end.
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-spec get_connections_pids({binary(), binary()}) -> [pid()].
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get_connections_pids(FromTo) ->
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case catch mnesia:dirty_read(s2s, FromTo) of
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L when is_list(L) ->
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[Connection#s2s.pid || Connection <- L];
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_ ->
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[]
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end.
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-spec try_register({binary(), binary()}) -> boolean().
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try_register(FromTo) ->
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MaxS2SConnectionsNumber = max_s2s_connections_number(FromTo),
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MaxS2SConnectionsNumberPerNode =
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max_s2s_connections_number_per_node(FromTo),
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F = fun () ->
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L = mnesia:read({s2s, FromTo}),
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NeededConnections = needed_connections_number(L,
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MaxS2SConnectionsNumber,
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MaxS2SConnectionsNumberPerNode),
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if NeededConnections > 0 ->
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mnesia:write(#s2s{fromto = FromTo, pid = self()}),
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true;
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true -> false
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end
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end,
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case mnesia:transaction(F) of
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{atomic, Res} -> Res;
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_ -> false
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end.
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-spec dirty_get_connections() -> [{binary(), binary()}].
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dirty_get_connections() ->
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mnesia:dirty_all_keys(s2s).
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-spec tls_options(binary(), [proplists:property()]) -> [proplists:property()].
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tls_options(LServer, DefaultOpts) ->
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TLSOpts1 = case ejabberd_pkix:get_certfile(LServer) of
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error -> DefaultOpts;
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{ok, CertFile} ->
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lists:keystore(certfile, 1, DefaultOpts,
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{certfile, CertFile})
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end,
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TLSOpts2 = case ejabberd_option:s2s_ciphers(LServer) of
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undefined -> TLSOpts1;
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Ciphers -> lists:keystore(ciphers, 1, TLSOpts1,
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{ciphers, Ciphers})
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end,
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TLSOpts3 = case ejabberd_option:s2s_protocol_options(LServer) of
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undefined -> TLSOpts2;
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ProtoOpts -> lists:keystore(protocol_options, 1, TLSOpts2,
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{protocol_options, ProtoOpts})
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end,
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TLSOpts4 = case ejabberd_option:s2s_dhfile(LServer) of
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undefined -> TLSOpts3;
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DHFile -> lists:keystore(dhfile, 1, TLSOpts3,
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{dhfile, DHFile})
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end,
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TLSOpts5 = case lists:keymember(cafile, 1, TLSOpts4) of
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true -> TLSOpts4;
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false -> [{cafile, get_cafile(LServer)}|TLSOpts4]
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end,
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case ejabberd_option:s2s_tls_compression(LServer) of
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undefined -> TLSOpts5;
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false -> [compression_none | TLSOpts5];
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true -> lists:delete(compression_none, TLSOpts5)
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end.
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-spec tls_required(binary()) -> boolean().
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tls_required(LServer) ->
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TLS = use_starttls(LServer),
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TLS == required.
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-spec tls_enabled(binary()) -> boolean().
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tls_enabled(LServer) ->
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TLS = use_starttls(LServer),
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TLS /= false.
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-spec zlib_enabled(binary()) -> boolean().
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zlib_enabled(LServer) ->
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ejabberd_option:s2s_zlib(LServer).
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-spec use_starttls(binary()) -> boolean() | optional | required.
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use_starttls(LServer) ->
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ejabberd_option:s2s_use_starttls(LServer).
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-spec get_idle_timeout(binary()) -> non_neg_integer() | infinity.
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get_idle_timeout(LServer) ->
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ejabberd_option:s2s_timeout(LServer).
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-spec queue_type(binary()) -> ram | file.
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queue_type(LServer) ->
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ejabberd_option:s2s_queue_type(LServer).
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-spec get_cafile(binary()) -> file:filename_all() | undefined.
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get_cafile(LServer) ->
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case ejabberd_option:s2s_cafile(LServer) of
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undefined ->
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ejabberd_option:ca_file();
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File ->
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File
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end.
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%%====================================================================
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%% gen_server callbacks
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%%====================================================================
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init([]) ->
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update_tables(),
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ejabberd_mnesia:create(?MODULE, s2s,
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[{ram_copies, [node()]},
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{type, bag},
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{attributes, record_info(fields, s2s)}]),
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case mnesia:subscribe(system) of
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{ok, _} ->
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ejabberd_commands:register_commands(get_commands_spec()),
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ejabberd_mnesia:create(
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?MODULE, temporarily_blocked,
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[{ram_copies, [node()]},
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{attributes, record_info(fields, temporarily_blocked)}]),
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ejabberd_hooks:add(host_up, ?MODULE, host_up, 50),
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ejabberd_hooks:add(host_down, ?MODULE, host_down, 60),
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lists:foreach(fun host_up/1, ejabberd_option:hosts()),
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{ok, #state{}};
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{error, Reason} ->
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{stop, Reason}
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end.
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handle_call(_Request, _From, State) ->
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{reply, ok, State}.
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handle_cast(_Msg, State) ->
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{noreply, State}.
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handle_info({mnesia_system_event, {mnesia_down, Node}}, State) ->
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clean_table_from_bad_node(Node),
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{noreply, State};
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handle_info({route, Packet}, State) ->
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route(Packet),
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{noreply, State};
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handle_info(_Info, State) -> {noreply, State}.
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terminate(_Reason, _State) ->
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ejabberd_commands:unregister_commands(get_commands_spec()),
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lists:foreach(fun host_down/1, ejabberd_option:hosts()),
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ejabberd_hooks:delete(host_up, ?MODULE, host_up, 50),
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ejabberd_hooks:delete(host_down, ?MODULE, host_down, 60),
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ok.
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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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host_up(Host) ->
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ejabberd_s2s_in:host_up(Host),
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ejabberd_s2s_out:host_up(Host).
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host_down(Host) ->
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lists:foreach(
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fun(#s2s{fromto = {From, _}, pid = Pid}) when node(Pid) == node() ->
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case ejabberd_router:host_of_route(From) of
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Host ->
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ejabberd_s2s_out:send(Pid, xmpp:serr_system_shutdown()),
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ejabberd_s2s_out:stop(Pid);
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_ ->
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ok
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end;
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(_) ->
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ok
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end, ets:tab2list(s2s)),
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ejabberd_s2s_in:host_down(Host),
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ejabberd_s2s_out:host_down(Host).
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-spec clean_table_from_bad_node(node()) -> any().
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clean_table_from_bad_node(Node) ->
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F = fun() ->
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Es = mnesia:select(
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s2s,
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[{#s2s{pid = '$1', _ = '_'},
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[{'==', {node, '$1'}, Node}],
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['$_']}]),
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lists:foreach(fun(E) ->
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mnesia:delete_object(E)
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end, Es)
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end,
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mnesia:async_dirty(F).
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-spec do_route(stanza()) -> ok.
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do_route(Packet) ->
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?DEBUG("local route:~n~s", [xmpp:pp(Packet)]),
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From = xmpp:get_from(Packet),
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To = xmpp:get_to(Packet),
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case start_connection(From, To) of
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{ok, Pid} when is_pid(Pid) ->
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?DEBUG("sending to process ~p~n", [Pid]),
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#jid{lserver = MyServer} = From,
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ejabberd_hooks:run(s2s_send_packet, MyServer, [Packet]),
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ejabberd_s2s_out:route(Pid, Packet);
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{error, Reason} ->
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Lang = xmpp:get_lang(Packet),
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Err = case Reason of
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policy_violation ->
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xmpp:err_policy_violation(
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<<"Server connections to local "
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"subdomains are forbidden">>, Lang);
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forbidden ->
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xmpp:err_forbidden(<<"Access denied by service policy">>, Lang);
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internal_server_error ->
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xmpp:err_internal_server_error()
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end,
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ejabberd_router:route_error(Packet, Err)
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end.
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-spec start_connection(jid(), jid())
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-> {ok, pid()} | {error, policy_violation | forbidden | internal_server_error}.
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start_connection(From, To) ->
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start_connection(From, To, []).
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-spec start_connection(jid(), jid(), [proplists:property()])
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-> {ok, pid()} | {error, policy_violation | forbidden | internal_server_error}.
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start_connection(From, To, Opts) ->
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#jid{lserver = MyServer} = From,
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#jid{lserver = Server} = To,
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FromTo = {MyServer, Server},
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MaxS2SConnectionsNumber =
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max_s2s_connections_number(FromTo),
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MaxS2SConnectionsNumberPerNode =
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max_s2s_connections_number_per_node(FromTo),
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?DEBUG("Finding connection for ~p~n", [FromTo]),
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case mnesia:dirty_read(s2s, FromTo) of
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[] ->
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%% We try to establish all the connections if the host is not a
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%% service and if the s2s host is not blacklisted or
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%% is in whitelist:
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LServer = ejabberd_router:host_of_route(MyServer),
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case is_service(From, To) of
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true ->
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{error, policy_violation};
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false ->
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case allow_host(LServer, Server) of
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true ->
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NeededConnections = needed_connections_number(
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[],
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MaxS2SConnectionsNumber,
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MaxS2SConnectionsNumberPerNode),
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open_several_connections(NeededConnections, MyServer,
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Server, From, FromTo,
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MaxS2SConnectionsNumber,
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MaxS2SConnectionsNumberPerNode, Opts);
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false ->
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{error, forbidden}
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end
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end;
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L when is_list(L) ->
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NeededConnections = needed_connections_number(L,
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MaxS2SConnectionsNumber,
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MaxS2SConnectionsNumberPerNode),
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if NeededConnections > 0 ->
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%% We establish the missing connections for this pair.
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open_several_connections(NeededConnections, MyServer,
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Server, From, FromTo,
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MaxS2SConnectionsNumber,
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MaxS2SConnectionsNumberPerNode, Opts);
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true ->
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%% We choose a connexion from the pool of opened ones.
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{ok, choose_connection(From, L)}
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end
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end.
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-spec choose_connection(jid(), [#s2s{}]) -> pid().
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choose_connection(From, Connections) ->
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choose_pid(From, [C#s2s.pid || C <- Connections]).
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-spec choose_pid(jid(), [pid()]) -> pid().
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choose_pid(From, Pids) ->
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Pids1 = case [P || P <- Pids, node(P) == node()] of
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[] -> Pids;
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Ps -> Ps
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end,
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Pid =
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lists:nth(erlang:phash(jid:remove_resource(From),
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length(Pids1)),
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Pids1),
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?DEBUG("Using ejabberd_s2s_out ~p~n", [Pid]),
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Pid.
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open_several_connections(N, MyServer, Server, From,
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FromTo, MaxS2SConnectionsNumber,
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MaxS2SConnectionsNumberPerNode, Opts) ->
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case lists:flatmap(
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fun(_) ->
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new_connection(MyServer, Server,
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From, FromTo, MaxS2SConnectionsNumber,
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MaxS2SConnectionsNumberPerNode, Opts)
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end, lists:seq(1, N)) of
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[] ->
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{error, internal_server_error};
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PIDs ->
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{ok, choose_pid(From, PIDs)}
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end.
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new_connection(MyServer, Server, From, FromTo,
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MaxS2SConnectionsNumber, MaxS2SConnectionsNumberPerNode, Opts) ->
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{ok, Pid} = ejabberd_s2s_out:start(MyServer, Server, Opts),
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F = fun() ->
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L = mnesia:read({s2s, FromTo}),
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NeededConnections = needed_connections_number(L,
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MaxS2SConnectionsNumber,
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MaxS2SConnectionsNumberPerNode),
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if NeededConnections > 0 ->
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mnesia:write(#s2s{fromto = FromTo, pid = Pid}),
|
|
Pid;
|
|
true -> choose_connection(From, L)
|
|
end
|
|
end,
|
|
TRes = mnesia:transaction(F),
|
|
case TRes of
|
|
{atomic, Pid1} ->
|
|
if Pid1 == Pid ->
|
|
ejabberd_s2s_out:connect(Pid);
|
|
true ->
|
|
ejabberd_s2s_out:stop(Pid)
|
|
end,
|
|
[Pid1];
|
|
{aborted, Reason} ->
|
|
?ERROR_MSG("failed to register connection ~s -> ~s: ~p",
|
|
[MyServer, Server, Reason]),
|
|
ejabberd_s2s_out:stop(Pid),
|
|
[]
|
|
end.
|
|
|
|
-spec max_s2s_connections_number({binary(), binary()}) -> pos_integer().
|
|
max_s2s_connections_number({From, To}) ->
|
|
case ejabberd_shaper:match(From, max_s2s_connections, jid:make(To)) of
|
|
Max when is_integer(Max) -> Max;
|
|
_ -> ?DEFAULT_MAX_S2S_CONNECTIONS_NUMBER
|
|
end.
|
|
|
|
-spec max_s2s_connections_number_per_node({binary(), binary()}) -> pos_integer().
|
|
max_s2s_connections_number_per_node({From, To}) ->
|
|
case ejabberd_shaper:match(From, max_s2s_connections_per_node, jid:make(To)) of
|
|
Max when is_integer(Max) -> Max;
|
|
_ -> ?DEFAULT_MAX_S2S_CONNECTIONS_NUMBER_PER_NODE
|
|
end.
|
|
|
|
-spec needed_connections_number([#s2s{}], integer(), integer()) -> integer().
|
|
needed_connections_number(Ls, MaxS2SConnectionsNumber,
|
|
MaxS2SConnectionsNumberPerNode) ->
|
|
LocalLs = [L || L <- Ls, node(L#s2s.pid) == node()],
|
|
lists:min([MaxS2SConnectionsNumber - length(Ls),
|
|
MaxS2SConnectionsNumberPerNode - length(LocalLs)]).
|
|
|
|
%%--------------------------------------------------------------------
|
|
%% Function: is_service(From, To) -> true | false
|
|
%% Description: Return true if the destination must be considered as a
|
|
%% service.
|
|
%% --------------------------------------------------------------------
|
|
-spec is_service(jid(), jid()) -> boolean().
|
|
is_service(From, To) ->
|
|
LFromDomain = From#jid.lserver,
|
|
case ejabberd_option:route_subdomains(LFromDomain) of
|
|
s2s -> % bypass RFC 3920 10.3
|
|
false;
|
|
local ->
|
|
Hosts = ejabberd_option:hosts(),
|
|
P = fun (ParentDomain) ->
|
|
lists:member(ParentDomain, Hosts)
|
|
end,
|
|
lists:any(P, parent_domains(To#jid.lserver))
|
|
end.
|
|
|
|
parent_domains(Domain) ->
|
|
lists:foldl(fun (Label, []) -> [Label];
|
|
(Label, [Head | Tail]) ->
|
|
[<<Label/binary, ".", Head/binary>>, Head | Tail]
|
|
end,
|
|
[], lists:reverse(str:tokens(Domain, <<".">>))).
|
|
|
|
%%%----------------------------------------------------------------------
|
|
%%% ejabberd commands
|
|
|
|
get_commands_spec() ->
|
|
[#ejabberd_commands{
|
|
name = incoming_s2s_number, tags = [stats, s2s],
|
|
desc = "Number of incoming s2s connections on the node",
|
|
policy = admin,
|
|
module = ?MODULE, function = incoming_s2s_number,
|
|
args = [], result = {s2s_incoming, integer}},
|
|
#ejabberd_commands{
|
|
name = outgoing_s2s_number, tags = [stats, s2s],
|
|
desc = "Number of outgoing s2s connections on the node",
|
|
policy = admin,
|
|
module = ?MODULE, function = outgoing_s2s_number,
|
|
args = [], result = {s2s_outgoing, integer}},
|
|
#ejabberd_commands{
|
|
name = stop_s2s_connections, tags = [s2s],
|
|
desc = "Stop all s2s outgoing and incoming connections",
|
|
policy = admin,
|
|
module = ?MODULE, function = stop_s2s_connections,
|
|
args = [], result = {res, rescode}}].
|
|
|
|
%% TODO Move those stats commands to ejabberd stats command ?
|
|
incoming_s2s_number() ->
|
|
supervisor_count(ejabberd_s2s_in_sup).
|
|
|
|
outgoing_s2s_number() ->
|
|
supervisor_count(ejabberd_s2s_out_sup).
|
|
|
|
supervisor_count(Supervisor) ->
|
|
case catch supervisor:which_children(Supervisor) of
|
|
{'EXIT', _} -> 0;
|
|
Result ->
|
|
length(Result)
|
|
end.
|
|
|
|
-spec stop_s2s_connections() -> ok.
|
|
stop_s2s_connections() ->
|
|
lists:foreach(
|
|
fun({_Id, Pid, _Type, _Module}) ->
|
|
supervisor:terminate_child(ejabberd_s2s_in_sup, Pid)
|
|
end, supervisor:which_children(ejabberd_s2s_in_sup)),
|
|
lists:foreach(
|
|
fun({_Id, Pid, _Type, _Module}) ->
|
|
supervisor:terminate_child(ejabberd_s2s_out_sup, Pid)
|
|
end, supervisor:which_children(ejabberd_s2s_out_sup)),
|
|
_ = mnesia:clear_table(s2s),
|
|
ok.
|
|
|
|
%%%----------------------------------------------------------------------
|
|
%%% Update Mnesia tables
|
|
|
|
update_tables() ->
|
|
_ = mnesia:delete_table(local_s2s),
|
|
ok.
|
|
|
|
%% Check if host is in blacklist or white list
|
|
allow_host(MyServer, S2SHost) ->
|
|
allow_host1(MyServer, S2SHost) andalso
|
|
not is_temporarly_blocked(S2SHost).
|
|
|
|
allow_host1(MyHost, S2SHost) ->
|
|
Rule = ejabberd_option:s2s_access(MyHost),
|
|
JID = jid:make(S2SHost),
|
|
case acl:match_rule(MyHost, Rule, JID) of
|
|
deny -> false;
|
|
allow ->
|
|
case ejabberd_hooks:run_fold(s2s_allow_host, MyHost,
|
|
allow, [MyHost, S2SHost]) of
|
|
deny -> false;
|
|
allow -> true;
|
|
_ -> true
|
|
end
|
|
end.
|
|
|
|
%% Get information about S2S connections of the specified type.
|
|
%% @spec (Type) -> [Info]
|
|
%% where Type = in | out
|
|
%% Info = [{InfoName::atom(), InfoValue::any()}]
|
|
get_info_s2s_connections(Type) ->
|
|
ChildType = case Type of
|
|
in -> ejabberd_s2s_in_sup;
|
|
out -> ejabberd_s2s_out_sup
|
|
end,
|
|
Connections = supervisor:which_children(ChildType),
|
|
get_s2s_info(Connections, Type).
|
|
|
|
get_s2s_info(Connections, Type) ->
|
|
complete_s2s_info(Connections, Type, []).
|
|
|
|
complete_s2s_info([], _, Result) -> Result;
|
|
complete_s2s_info([Connection | T], Type, Result) ->
|
|
{_, PID, _, _} = Connection,
|
|
State = get_s2s_state(PID),
|
|
complete_s2s_info(T, Type, [State | Result]).
|
|
|
|
-spec get_s2s_state(pid()) -> [{status, open | closed | error} | {s2s_pid, pid()}].
|
|
|
|
get_s2s_state(S2sPid) ->
|
|
Infos = case p1_fsm:sync_send_all_state_event(S2sPid,
|
|
get_state_infos)
|
|
of
|
|
{state_infos, Is} -> [{status, open} | Is];
|
|
{noproc, _} -> [{status, closed}]; %% Connection closed
|
|
{badrpc, _} -> [{status, error}]
|
|
end,
|
|
[{s2s_pid, S2sPid} | Infos].
|