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xmpp.chapril.org-ejabberd/src/ejabberd_s2s.erl
Evgeniy Khramtsov d7250111ce Reuse some translation strings
2017-09-24 14:32:37 +03:00

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%%%----------------------------------------------------------------------
%%% File : ejabberd_s2s.erl
%%% Author : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : S2S connections manager
%%% Created : 7 Dec 2002 by Alexey Shchepin <alexey@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2017 ProcessOne
%%%
%%% This program is free software; you can redistribute it and/or
%%% modify it under the terms of the GNU General Public License as
%%% published by the Free Software Foundation; either version 2 of the
%%% License, or (at your option) any later version.
%%%
%%% This program is distributed in the hope that it will be useful,
%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
%%% General Public License for more details.
%%%
%%% You should have received a copy of the GNU General Public License along
%%% with this program; if not, write to the Free Software Foundation, Inc.,
%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
%%%
%%%----------------------------------------------------------------------
-module(ejabberd_s2s).
-protocol({xep, 220, '1.1'}).
-behaviour(ejabberd_config).
-author('alexey@process-one.net').
-behaviour(gen_server).
%% API
-export([start_link/0, route/1, have_connection/1,
get_connections_pids/1, try_register/1,
remove_connection/2, start_connection/2, start_connection/3,
dirty_get_connections/0, allow_host/2,
incoming_s2s_number/0, outgoing_s2s_number/0,
stop_s2s_connections/0,
clean_temporarily_blocked_table/0,
list_temporarily_blocked_hosts/0,
external_host_overloaded/1, is_temporarly_blocked/1,
get_commands_spec/0, zlib_enabled/1, get_idle_timeout/1,
tls_required/1, tls_verify/1, tls_enabled/1, tls_options/2,
host_up/1, host_down/1, queue_type/1]).
%% gen_server callbacks
-export([init/1, handle_call/3, handle_cast/2,
handle_info/2, terminate/2, code_change/3]).
-export([get_info_s2s_connections/1,
transform_options/1, opt_type/1]).
-include("ejabberd.hrl").
-include("logger.hrl").
-include("xmpp.hrl").
-include("ejabberd_commands.hrl").
-include_lib("public_key/include/public_key.hrl").
-define(PKIXEXPLICIT, 'OTP-PUB-KEY').
-define(PKIXIMPLICIT, 'OTP-PUB-KEY').
-include("XmppAddr.hrl").
-define(DEFAULT_MAX_S2S_CONNECTIONS_NUMBER, 1).
-define(DEFAULT_MAX_S2S_CONNECTIONS_NUMBER_PER_NODE, 1).
-define(S2S_OVERLOAD_BLOCK_PERIOD, 60).
%% once a server is temporarly blocked, it stay blocked for 60 seconds
-record(s2s, {fromto = {<<"">>, <<"">>} :: {binary(), binary()} | '_',
pid = self() :: pid() | '_' | '$1'}).
-record(state, {}).
-record(temporarily_blocked, {host = <<"">> :: binary(),
timestamp :: integer()}).
-type temporarily_blocked() :: #temporarily_blocked{}.
start_link() ->
gen_server:start_link({local, ?MODULE}, ?MODULE, [],
[]).
-spec route(stanza()) -> ok.
route(Packet) ->
try do_route(Packet)
catch E:R ->
?ERROR_MSG("failed to route packet:~n~s~nReason = ~p",
[xmpp:pp(Packet), {E, {R, erlang:get_stacktrace()}}])
end.
clean_temporarily_blocked_table() ->
mnesia:clear_table(temporarily_blocked).
-spec list_temporarily_blocked_hosts() -> [temporarily_blocked()].
list_temporarily_blocked_hosts() ->
ets:tab2list(temporarily_blocked).
-spec external_host_overloaded(binary()) -> {aborted, any()} | {atomic, ok}.
external_host_overloaded(Host) ->
?INFO_MSG("Disabling connections from ~s for ~p "
"seconds",
[Host, ?S2S_OVERLOAD_BLOCK_PERIOD]),
mnesia:transaction(fun () ->
Time = p1_time_compat:monotonic_time(),
mnesia:write(#temporarily_blocked{host = Host,
timestamp = Time})
end).
-spec is_temporarly_blocked(binary()) -> boolean().
is_temporarly_blocked(Host) ->
case mnesia:dirty_read(temporarily_blocked, Host) of
[] -> false;
[#temporarily_blocked{timestamp = T} = Entry] ->
Diff = p1_time_compat:monotonic_time() - T,
case p1_time_compat:convert_time_unit(Diff, native, micro_seconds) of
N when N > (?S2S_OVERLOAD_BLOCK_PERIOD) * 1000 * 1000 ->
mnesia:dirty_delete_object(Entry), false;
_ -> true
end
end.
-spec remove_connection({binary(), binary()},
pid()) -> {atomic, ok} | ok | {aborted, any()}.
remove_connection(FromTo, Pid) ->
case catch mnesia:dirty_match_object(s2s,
#s2s{fromto = FromTo, pid = Pid})
of
[#s2s{pid = Pid}] ->
F = fun () ->
mnesia:delete_object(#s2s{fromto = FromTo, pid = Pid})
end,
mnesia:transaction(F);
_ -> ok
end.
-spec have_connection({binary(), binary()}) -> boolean().
have_connection(FromTo) ->
case catch mnesia:dirty_read(s2s, FromTo) of
[_] ->
true;
_ ->
false
end.
-spec get_connections_pids({binary(), binary()}) -> [pid()].
get_connections_pids(FromTo) ->
case catch mnesia:dirty_read(s2s, FromTo) of
L when is_list(L) ->
[Connection#s2s.pid || Connection <- L];
_ ->
[]
end.
-spec try_register({binary(), binary()}) -> boolean().
try_register(FromTo) ->
MaxS2SConnectionsNumber = max_s2s_connections_number(FromTo),
MaxS2SConnectionsNumberPerNode =
max_s2s_connections_number_per_node(FromTo),
F = fun () ->
L = mnesia:read({s2s, FromTo}),
NeededConnections = needed_connections_number(L,
MaxS2SConnectionsNumber,
MaxS2SConnectionsNumberPerNode),
if NeededConnections > 0 ->
mnesia:write(#s2s{fromto = FromTo, pid = self()}),
true;
true -> false
end
end,
case mnesia:transaction(F) of
{atomic, Res} -> Res;
_ -> false
end.
-spec dirty_get_connections() -> [{binary(), binary()}].
dirty_get_connections() ->
mnesia:dirty_all_keys(s2s).
-spec tls_options(binary(), [proplists:property()]) -> [proplists:property()].
tls_options(LServer, DefaultOpts) ->
TLSOpts1 = case ejabberd_config:get_option(
{domain_certfile, LServer},
ejabberd_config:get_option(
{s2s_certfile, LServer})) of
undefined -> DefaultOpts;
CertFile -> lists:keystore(certfile, 1, DefaultOpts,
{certfile, CertFile})
end,
TLSOpts2 = case ejabberd_config:get_option(
{s2s_ciphers, LServer}) of
undefined -> TLSOpts1;
Ciphers -> lists:keystore(ciphers, 1, TLSOpts1,
{ciphers, Ciphers})
end,
TLSOpts3 = case ejabberd_config:get_option(
{s2s_protocol_options, LServer}) of
undefined -> TLSOpts2;
ProtoOpts -> lists:keystore(protocol_options, 1, TLSOpts2,
{protocol_options, ProtoOpts})
end,
TLSOpts4 = case ejabberd_config:get_option(
{s2s_dhfile, LServer}) of
undefined -> TLSOpts3;
DHFile -> lists:keystore(dhfile, 1, TLSOpts3,
{dhfile, DHFile})
end,
TLSOpts5 = case ejabberd_config:get_option(
{s2s_cafile, LServer}) of
undefined -> TLSOpts4;
CAFile -> lists:keystore(cafile, 1, TLSOpts4,
{cafile, CAFile})
end,
case ejabberd_config:get_option({s2s_tls_compression, LServer}) of
undefined -> TLSOpts5;
false -> [compression_none | TLSOpts5];
true -> lists:delete(compression_none, TLSOpts5)
end.
-spec tls_required(binary()) -> boolean().
tls_required(LServer) ->
TLS = use_starttls(LServer),
TLS == required orelse TLS == required_trusted.
-spec tls_verify(binary()) -> boolean().
tls_verify(LServer) ->
TLS = use_starttls(LServer),
TLS == required_trusted.
-spec tls_enabled(binary()) -> boolean().
tls_enabled(LServer) ->
TLS = use_starttls(LServer),
TLS /= false.
-spec zlib_enabled(binary()) -> boolean().
zlib_enabled(LServer) ->
ejabberd_config:get_option({s2s_zlib, LServer}, false).
-spec use_starttls(binary()) -> boolean() | optional | required | required_trusted.
use_starttls(LServer) ->
ejabberd_config:get_option({s2s_use_starttls, LServer}, false).
-spec get_idle_timeout(binary()) -> non_neg_integer() | infinity.
get_idle_timeout(LServer) ->
ejabberd_config:get_option({s2s_timeout, LServer}, timer:minutes(10)).
-spec queue_type(binary()) -> ram | file.
queue_type(LServer) ->
ejabberd_config:get_option(
{s2s_queue_type, LServer},
ejabberd_config:default_queue_type(LServer)).
%%====================================================================
%% gen_server callbacks
%%====================================================================
init([]) ->
update_tables(),
ejabberd_mnesia:create(?MODULE, s2s,
[{ram_copies, [node()]},
{type, bag},
{attributes, record_info(fields, s2s)}]),
mnesia:subscribe(system),
ejabberd_commands:register_commands(get_commands_spec()),
ejabberd_mnesia:create(?MODULE, temporarily_blocked,
[{ram_copies, [node()]},
{attributes, record_info(fields, temporarily_blocked)}]),
ejabberd_hooks:add(host_up, ?MODULE, host_up, 50),
ejabberd_hooks:add(host_down, ?MODULE, host_down, 60),
lists:foreach(fun host_up/1, ?MYHOSTS),
{ok, #state{}}.
handle_call(_Request, _From, State) ->
{reply, ok, State}.
handle_cast(_Msg, State) ->
{noreply, State}.
handle_info({mnesia_system_event, {mnesia_down, Node}}, State) ->
clean_table_from_bad_node(Node),
{noreply, State};
handle_info({route, Packet}, State) ->
route(Packet),
{noreply, State};
handle_info(_Info, State) -> {noreply, State}.
terminate(_Reason, _State) ->
ejabberd_commands:unregister_commands(get_commands_spec()),
lists:foreach(fun host_down/1, ?MYHOSTS),
ejabberd_hooks:delete(host_up, ?MODULE, host_up, 50),
ejabberd_hooks:delete(host_down, ?MODULE, host_down, 60),
ok.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%%--------------------------------------------------------------------
%%% Internal functions
%%--------------------------------------------------------------------
host_up(Host) ->
ejabberd_s2s_in:host_up(Host),
ejabberd_s2s_out:host_up(Host).
host_down(Host) ->
lists:foreach(
fun(#s2s{fromto = {From, _}, pid = Pid}) when node(Pid) == node() ->
case ejabberd_router:host_of_route(From) of
Host ->
ejabberd_s2s_out:send(Pid, xmpp:serr_system_shutdown()),
ejabberd_s2s_out:stop(Pid);
_ ->
ok
end;
(_) ->
ok
end, ets:tab2list(s2s)),
ejabberd_s2s_in:host_down(Host),
ejabberd_s2s_out:host_down(Host).
-spec clean_table_from_bad_node(node()) -> any().
clean_table_from_bad_node(Node) ->
F = fun() ->
Es = mnesia:select(
s2s,
[{#s2s{pid = '$1', _ = '_'},
[{'==', {node, '$1'}, Node}],
['$_']}]),
lists:foreach(fun(E) ->
mnesia:delete_object(E)
end, Es)
end,
mnesia:async_dirty(F).
-spec do_route(stanza()) -> ok.
do_route(Packet) ->
?DEBUG("local route:~n~s", [xmpp:pp(Packet)]),
From = xmpp:get_from(Packet),
To = xmpp:get_to(Packet),
case start_connection(From, To) of
{ok, Pid} when is_pid(Pid) ->
?DEBUG("sending to process ~p~n", [Pid]),
#jid{lserver = MyServer} = From,
ejabberd_hooks:run(s2s_send_packet, MyServer, [Packet]),
ejabberd_s2s_out:route(Pid, Packet);
{error, Reason} ->
Lang = xmpp:get_lang(Packet),
Err = case Reason of
policy_violation ->
xmpp:err_policy_violation(
<<"Server connections to local "
"subdomains are forbidden">>, Lang);
forbidden ->
xmpp:err_forbidden(<<"Access denied by service policy">>, Lang);
internal_server_error ->
xmpp:err_internal_server_error()
end,
ejabberd_router:route_error(Packet, Err)
end.
-spec start_connection(jid(), jid())
-> {ok, pid()} | {error, policy_violation | forbidden | internal_server_error}.
start_connection(From, To) ->
start_connection(From, To, []).
-spec start_connection(jid(), jid(), [proplists:property()])
-> {ok, pid()} | {error, policy_violation | forbidden | internal_server_error}.
start_connection(From, To, Opts) ->
#jid{lserver = MyServer} = From,
#jid{lserver = Server} = To,
FromTo = {MyServer, Server},
MaxS2SConnectionsNumber =
max_s2s_connections_number(FromTo),
MaxS2SConnectionsNumberPerNode =
max_s2s_connections_number_per_node(FromTo),
?DEBUG("Finding connection for ~p~n", [FromTo]),
case mnesia:dirty_read(s2s, FromTo) of
[] ->
%% We try to establish all the connections if the host is not a
%% service and if the s2s host is not blacklisted or
%% is in whitelist:
LServer = ejabberd_router:host_of_route(MyServer),
case is_service(From, To) of
true ->
{error, policy_violation};
false ->
case allow_host(LServer, Server) of
true ->
NeededConnections = needed_connections_number(
[],
MaxS2SConnectionsNumber,
MaxS2SConnectionsNumberPerNode),
open_several_connections(NeededConnections, MyServer,
Server, From, FromTo,
MaxS2SConnectionsNumber,
MaxS2SConnectionsNumberPerNode, Opts);
false ->
{error, forbidden}
end
end;
L when is_list(L) ->
NeededConnections = needed_connections_number(L,
MaxS2SConnectionsNumber,
MaxS2SConnectionsNumberPerNode),
if NeededConnections > 0 ->
%% We establish the missing connections for this pair.
open_several_connections(NeededConnections, MyServer,
Server, From, FromTo,
MaxS2SConnectionsNumber,
MaxS2SConnectionsNumberPerNode, Opts);
true ->
%% We choose a connexion from the pool of opened ones.
{ok, choose_connection(From, L)}
end
end.
-spec choose_connection(jid(), [#s2s{}]) -> pid().
choose_connection(From, Connections) ->
choose_pid(From, [C#s2s.pid || C <- Connections]).
-spec choose_pid(jid(), [pid()]) -> pid().
choose_pid(From, Pids) ->
Pids1 = case [P || P <- Pids, node(P) == node()] of
[] -> Pids;
Ps -> Ps
end,
Pid =
lists:nth(erlang:phash(jid:remove_resource(From),
length(Pids1)),
Pids1),
?DEBUG("Using ejabberd_s2s_out ~p~n", [Pid]),
Pid.
open_several_connections(N, MyServer, Server, From,
FromTo, MaxS2SConnectionsNumber,
MaxS2SConnectionsNumberPerNode, Opts) ->
case lists:flatmap(
fun(_) ->
new_connection(MyServer, Server,
From, FromTo, MaxS2SConnectionsNumber,
MaxS2SConnectionsNumberPerNode, Opts)
end, lists:seq(1, N)) of
[] ->
{error, internal_server_error};
PIDs ->
{ok, choose_pid(From, PIDs)}
end.
new_connection(MyServer, Server, From, FromTo,
MaxS2SConnectionsNumber, MaxS2SConnectionsNumberPerNode, Opts) ->
{ok, Pid} = ejabberd_s2s_out:start(MyServer, Server, Opts),
F = fun() ->
L = mnesia:read({s2s, FromTo}),
NeededConnections = needed_connections_number(L,
MaxS2SConnectionsNumber,
MaxS2SConnectionsNumberPerNode),
if NeededConnections > 0 ->
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()}) -> integer().
max_s2s_connections_number({From, To}) ->
case acl:match_rule(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()}) -> integer().
max_s2s_connections_number_per_node({From, To}) ->
case acl:match_rule(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_config:get_option({route_subdomains, LFromDomain}, local) of
s2s -> % bypass RFC 3920 10.3
false;
local ->
Hosts = (?MYHOSTS),
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() ->
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]),
mnesia:clear_table(s2s);
[fromto, pid, key] ->
mnesia:transform_table(s2s, ignore, [fromto, pid]),
mnesia:clear_table(s2s);
[fromto, pid] -> 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_host1(MyServer, S2SHost) andalso
not is_temporarly_blocked(S2SHost).
allow_host1(MyHost, S2SHost) ->
Rule = ejabberd_config:get_option({s2s_access, MyHost}, all),
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.
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 = misc: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 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].
-type use_starttls() :: boolean() | optional | required | required_trusted.
-spec opt_type(route_subdomains) -> fun((s2s | local) -> s2s | local);
(s2s_access) -> fun((any()) -> any());
(s2s_certfile) -> fun((binary()) -> binary());
(s2s_ciphers) -> fun((binary()) -> binary());
(s2s_dhfile) -> fun((binary()) -> binary());
(s2s_cafile) -> fun((binary()) -> binary());
(s2s_protocol_options) -> fun(([binary()]) -> binary());
(s2s_tls_compression) -> fun((boolean()) -> boolean());
(s2s_use_starttls) -> fun((use_starttls()) -> use_starttls());
(s2s_zlib) -> fun((boolean()) -> boolean());
(s2s_timeout) -> fun((timeout()) -> timeout());
(s2s_queue_type) -> fun((ram | file) -> ram | file);
(atom()) -> [atom()].
opt_type(route_subdomains) ->
fun (s2s) -> s2s;
(local) -> local
end;
opt_type(s2s_access) ->
fun acl:access_rules_validator/1;
opt_type(s2s_certfile) -> fun misc:try_read_file/1;
opt_type(s2s_ciphers) -> fun iolist_to_binary/1;
opt_type(s2s_dhfile) -> fun misc:try_read_file/1;
opt_type(s2s_cafile) -> fun misc:try_read_file/1;
opt_type(s2s_protocol_options) ->
fun (Options) -> str:join(Options, <<"|">>) end;
opt_type(s2s_tls_compression) ->
fun (true) -> true;
(false) -> false
end;
opt_type(s2s_use_starttls) ->
fun (true) -> true;
(false) -> false;
(optional) -> optional;
(required) -> required;
(required_trusted) ->
?WARNING_MSG("The value 'required_trusted' of option "
"'s2s_use_starttls' is deprected and will be "
"unsupported in future releases. Instead, "
"set it to 'required' and make sure "
"mod_s2s_dialback is *NOT* loaded", []),
required_trusted
end;
opt_type(s2s_zlib) ->
fun(B) when is_boolean(B) -> B end;
opt_type(s2s_timeout) ->
fun(I) when is_integer(I), I >= 0 -> timer:seconds(I);
(infinity) -> infinity;
(unlimited) -> infinity
end;
opt_type(s2s_queue_type) ->
fun(ram) -> ram; (file) -> file end;
opt_type(_) ->
[route_subdomains, s2s_access, s2s_certfile, s2s_zlib,
s2s_ciphers, s2s_dhfile, s2s_cafile, s2s_protocol_options,
s2s_tls_compression, s2s_use_starttls, s2s_timeout, s2s_queue_type].
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