622 lines
20 KiB
Erlang
622 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) 2002-2013 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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-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/3, have_connection/1,
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has_key/2, get_connections_pids/1, try_register/1,
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remove_connection/3, find_connection/2,
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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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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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%% 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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%% ejabberd API
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-export([get_info_s2s_connections/1, transform_options/1]).
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-include("ejabberd.hrl").
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-include("logger.hrl").
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-include("jlib.hrl").
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-include("ejabberd_commands.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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key = <<"">> :: binary() | '_'}).
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-record(state, {}).
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-record(temporarily_blocked, {host = <<"">> :: binary(),
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timestamp = now() :: erlang:timestamp()}).
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-type temporarily_blocked() :: #temporarily_blocked{}.
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%%====================================================================
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%% API
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%%====================================================================
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%%--------------------------------------------------------------------
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%% Function: start_link() -> {ok,Pid} | ignore | {error,Error}
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%% Description: Starts the server
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%%--------------------------------------------------------------------
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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(jid(), jid(), xmlel()) -> ok.
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route(From, To, Packet) ->
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case catch do_route(From, To, Packet) of
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{'EXIT', Reason} ->
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?ERROR_MSG("~p~nwhen processing: ~p",
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[Reason, {From, To, Packet}]);
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_ -> ok
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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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mnesia:write(#temporarily_blocked{host = Host,
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timestamp =
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now()})
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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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case timer:now_diff(now(), T) 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()},
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pid(), binary()) -> {atomic, ok} |
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ok |
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{aborted, any()}.
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remove_connection(FromTo, Pid, Key) ->
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case catch mnesia:dirty_match_object(s2s,
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#s2s{fromto = FromTo, pid = Pid,
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_ = '_'})
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of
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[#s2s{pid = Pid, key = Key}] ->
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F = fun () ->
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mnesia:delete_object(#s2s{fromto = FromTo, pid = Pid,
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key = Key})
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end,
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mnesia:transaction(F);
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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 has_key({binary(), binary()}, binary()) -> boolean().
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has_key(FromTo, Key) ->
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case mnesia:dirty_select(s2s,
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[{#s2s{fromto = FromTo, key = Key, _ = '_'},
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[],
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['$_']}]) of
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[] ->
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false;
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_ ->
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true
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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()}) -> {key, binary()} | false.
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try_register(FromTo) ->
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Key = randoms:get_string(),
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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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key = Key}),
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{key, Key};
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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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%%====================================================================
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%% gen_server callbacks
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%%====================================================================
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%%--------------------------------------------------------------------
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%% Function: init(Args) -> {ok, State} |
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%% {ok, State, Timeout} |
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%% ignore |
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%% {stop, Reason}
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%% Description: Initiates the server
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%%--------------------------------------------------------------------
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init([]) ->
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update_tables(),
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mnesia:create_table(s2s, [{ram_copies, [node()]}, {type, bag},
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{attributes, record_info(fields, s2s)}]),
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mnesia:add_table_copy(s2s, node(), ram_copies),
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mnesia:subscribe(system),
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ejabberd_commands:register_commands(commands()),
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mnesia:create_table(temporarily_blocked, [{ram_copies, [node()]}, {attributes, record_info(fields, temporarily_blocked)}]),
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{ok, #state{}}.
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%%--------------------------------------------------------------------
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%% Function: %% handle_call(Request, From, State) -> {reply, Reply, State} |
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%% {reply, Reply, State, Timeout} |
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%% {noreply, State} |
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%% {noreply, State, Timeout} |
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%% {stop, Reason, Reply, State} |
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%% {stop, Reason, State}
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%% Description: Handling call messages
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%%--------------------------------------------------------------------
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handle_call(_Request, _From, State) ->
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Reply = ok,
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{reply, Reply, State}.
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%%--------------------------------------------------------------------
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%% Function: handle_cast(Msg, State) -> {noreply, State} |
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%% {noreply, State, Timeout} |
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%% {stop, Reason, State}
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%% Description: Handling cast messages
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%%--------------------------------------------------------------------
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handle_cast(_Msg, State) ->
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{noreply, State}.
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%%--------------------------------------------------------------------
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%% Function: handle_info(Info, State) -> {noreply, State} |
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%% {noreply, State, Timeout} |
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%% {stop, Reason, State}
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%% Description: Handling all non call/cast messages
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%%--------------------------------------------------------------------
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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, From, To, Packet}, State) ->
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case catch do_route(From, To, Packet) of
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{'EXIT', Reason} ->
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?ERROR_MSG("~p~nwhen processing: ~p",
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[Reason, {From, To, Packet}]);
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_ -> ok
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end,
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{noreply, State};
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handle_info(_Info, State) -> {noreply, State}.
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%%--------------------------------------------------------------------
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%% Function: terminate(Reason, State) -> void()
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%% Description: This function is called by a gen_server when it is about to
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%% terminate. It should be the opposite of Module:init/1 and do any necessary
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%% cleaning up. When it returns, the gen_server terminates with Reason.
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%% The return value is ignored.
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%%--------------------------------------------------------------------
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terminate(_Reason, _State) ->
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ejabberd_commands:unregister_commands(commands()),
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ok.
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%%--------------------------------------------------------------------
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%% Func: code_change(OldVsn, State, Extra) -> {ok, NewState}
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%% Description: Convert process state when code is changed
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%%--------------------------------------------------------------------
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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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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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do_route(From, To, Packet) ->
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?DEBUG("s2s manager~n\tfrom ~p~n\tto ~p~n\tpacket "
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"~P~n",
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[From, To, Packet, 8]),
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case find_connection(From, To) of
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{atomic, Pid} when is_pid(Pid) ->
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?DEBUG("sending to process ~p~n", [Pid]),
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#xmlel{name = Name, attrs = Attrs, children = Els} =
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Packet,
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NewAttrs =
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jlib:replace_from_to_attrs(jlib:jid_to_string(From),
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jlib:jid_to_string(To), Attrs),
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#jid{lserver = MyServer} = From,
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ejabberd_hooks:run(s2s_send_packet, MyServer,
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[From, To, Packet]),
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send_element(Pid,
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#xmlel{name = Name, attrs = NewAttrs, children = Els}),
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ok;
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{aborted, _Reason} ->
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case xml:get_tag_attr_s(<<"type">>, Packet) of
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<<"error">> -> ok;
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<<"result">> -> ok;
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_ ->
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Err = jlib:make_error_reply(Packet,
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?ERR_SERVICE_UNAVAILABLE),
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ejabberd_router:route(To, From, Err)
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end,
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false
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end.
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-spec find_connection(jid(), jid()) -> {aborted, any()} | {atomic, pid()}.
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find_connection(From, To) ->
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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 catch mnesia:dirty_read(s2s, FromTo) of
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{'EXIT', Reason} -> {aborted, Reason};
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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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case not is_service(From, To) andalso
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allow_host(MyServer, Server)
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of
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true ->
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NeededConnections = needed_connections_number([],
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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);
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false -> {aborted, error}
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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);
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true ->
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%% We choose a connexion from the pool of opened ones.
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{atomic, choose_connection(From, L)}
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end
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end.
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choose_connection(From, Connections) ->
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choose_pid(From, [C#s2s.pid || C <- Connections]).
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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(jlib: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) ->
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ConnectionsResult = [new_connection(MyServer, Server,
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From, FromTo, MaxS2SConnectionsNumber,
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MaxS2SConnectionsNumberPerNode)
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|| _N <- lists:seq(1, N)],
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case [PID || {atomic, PID} <- ConnectionsResult] of
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[] -> hd(ConnectionsResult);
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PIDs -> {atomic, 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) ->
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Key = randoms:get_string(),
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{ok, Pid} = ejabberd_s2s_out:start(
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MyServer, Server, {new, Key}),
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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,
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key = Key}),
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?INFO_MSG("New s2s connection started ~p", [Pid]),
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Pid;
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true -> choose_connection(From, L)
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end
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end,
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TRes = mnesia:transaction(F),
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case TRes of
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{atomic, Pid} -> ejabberd_s2s_out:start_connection(Pid);
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_ -> ejabberd_s2s_out:stop_connection(Pid)
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end,
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TRes.
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max_s2s_connections_number({From, To}) ->
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case acl:match_rule(From, max_s2s_connections,
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jlib:make_jid(<<"">>, To, <<"">>))
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of
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Max when is_integer(Max) -> Max;
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_ -> ?DEFAULT_MAX_S2S_CONNECTIONS_NUMBER
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end.
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max_s2s_connections_number_per_node({From, To}) ->
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case acl:match_rule(From, max_s2s_connections_per_node,
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jlib:make_jid(<<"">>, To, <<"">>))
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of
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Max when is_integer(Max) -> Max;
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_ -> ?DEFAULT_MAX_S2S_CONNECTIONS_NUMBER_PER_NODE
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end.
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needed_connections_number(Ls, MaxS2SConnectionsNumber,
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MaxS2SConnectionsNumberPerNode) ->
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LocalLs = [L || L <- Ls, node(L#s2s.pid) == node()],
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lists:min([MaxS2SConnectionsNumber - length(Ls),
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MaxS2SConnectionsNumberPerNode - length(LocalLs)]).
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%%--------------------------------------------------------------------
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%% Function: is_service(From, To) -> true | false
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%% Description: Return true if the destination must be considered as a
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%% service.
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%% --------------------------------------------------------------------
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is_service(From, To) ->
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LFromDomain = From#jid.lserver,
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case ejabberd_config:get_option(
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{route_subdomains, LFromDomain},
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fun(s2s) -> s2s; (local) -> local end, local) of
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s2s -> % bypass RFC 3920 10.3
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false;
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local ->
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Hosts = (?MYHOSTS),
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P = fun (ParentDomain) ->
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lists:member(ParentDomain, Hosts)
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end,
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lists:any(P, parent_domains(To#jid.lserver))
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end.
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parent_domains(Domain) ->
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lists:foldl(fun (Label, []) -> [Label];
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(Label, [Head | Tail]) ->
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[<<Label/binary, ".", Head/binary>>, Head | Tail]
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end,
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[], lists:reverse(str:tokens(Domain, <<".">>))).
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send_element(Pid, El) -> Pid ! {send_element, El}.
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%%%----------------------------------------------------------------------
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%%% ejabberd commands
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commands() ->
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[#ejabberd_commands{name = incoming_s2s_number,
|
|
tags = [stats, s2s],
|
|
desc =
|
|
"Number of incoming s2s connections on "
|
|
"the node",
|
|
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",
|
|
module = ?MODULE, function = outgoing_s2s_number,
|
|
args = [], result = {s2s_outgoing, integer}}].
|
|
|
|
incoming_s2s_number() ->
|
|
length(supervisor:which_children(ejabberd_s2s_in_sup)).
|
|
|
|
outgoing_s2s_number() ->
|
|
length(supervisor:which_children(ejabberd_s2s_out_sup)).
|
|
|
|
%%%----------------------------------------------------------------------
|
|
%%% Update Mnesia tables
|
|
|
|
update_tables() ->
|
|
case catch mnesia:table_info(s2s, type) of
|
|
bag -> ok;
|
|
{'EXIT', _} -> ok;
|
|
_ -> mnesia:delete_table(s2s)
|
|
end,
|
|
case catch mnesia:table_info(s2s, attributes) of
|
|
[fromto, node, key] ->
|
|
mnesia:transform_table(s2s, ignore, [fromto, pid, key]),
|
|
mnesia:clear_table(s2s);
|
|
[fromto, pid, key] -> ok;
|
|
{'EXIT', _} -> ok
|
|
end,
|
|
case lists:member(local_s2s, mnesia:system_info(tables)) of
|
|
true ->
|
|
mnesia:delete_table(local_s2s);
|
|
false ->
|
|
ok
|
|
end.
|
|
|
|
%% Check if host is in blacklist or white list
|
|
allow_host(MyServer, S2SHost) ->
|
|
allow_host2(MyServer, S2SHost) andalso
|
|
not is_temporarly_blocked(S2SHost).
|
|
|
|
allow_host2(MyServer, S2SHost) ->
|
|
Hosts = (?MYHOSTS),
|
|
case lists:dropwhile(fun (ParentDomain) ->
|
|
not lists:member(ParentDomain, Hosts)
|
|
end,
|
|
parent_domains(MyServer))
|
|
of
|
|
[MyHost | _] -> allow_host1(MyHost, S2SHost);
|
|
[] -> allow_host1(MyServer, S2SHost)
|
|
end.
|
|
|
|
allow_host1(MyHost, S2SHost) ->
|
|
Rule = ejabberd_config:get_option(
|
|
s2s_access,
|
|
fun(A) when is_atom(A) -> A end,
|
|
all),
|
|
JID = jlib:make_jid(<<"">>, 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.
|
|
|
|
transform_options(Opts) ->
|
|
lists:foldl(fun transform_options/2, [], Opts).
|
|
|
|
transform_options({{s2s_host, Host}, Action}, Opts) ->
|
|
?WARNING_MSG("Option 's2s_host' is deprecated. "
|
|
"The option is still supported but it is better to "
|
|
"fix your config: use access rules instead.", []),
|
|
ACLName = jlib:binary_to_atom(
|
|
iolist_to_binary(["s2s_access_", Host])),
|
|
[{acl, ACLName, {server, Host}},
|
|
{access, s2s, [{Action, ACLName}]},
|
|
{s2s_access, s2s} |
|
|
Opts];
|
|
transform_options({s2s_default_policy, Action}, Opts) ->
|
|
?WARNING_MSG("Option 's2s_default_policy' is deprecated. "
|
|
"The option is still supported but it is better to "
|
|
"fix your config: "
|
|
"use 's2s_access' with an access rule.", []),
|
|
[{access, s2s, [{Action, all}]},
|
|
{s2s_access, s2s} |
|
|
Opts];
|
|
transform_options(Opt, Opts) ->
|
|
[Opt|Opts].
|
|
|
|
%% 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 gen_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].
|