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xmpp.chapril.org-ejabberd/src/ejabberd_listener.erl
Evgeniy Khramtsov 2d43c07c62 Get rid of ejabberd receiver 
ejabberd receivers were meant to serve connections from frontends
to backends. However, this approach was not popular and frontend
related code was removed in previous releases. Now, ejabberd receiver's
code was also removed, making the code shorter and cleaner. Also, in
stress tests ejabberd now handles load more robustly, without
c2s processes overload (even with disabled shapers).

ejabberd_socket.erl is renamed to xmpp_socket.erl: it's supposed to
be finally moved into stand-alone xmpp library.
2017-12-26 18:55:57 +03:00

669 lines
21 KiB
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%%%----------------------------------------------------------------------
%%% File : ejabberd_listener.erl
%%% Author : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : Manage socket listener
%%% Created : 16 Nov 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_listener).
-behaviour(ejabberd_config).
-author('alexey@process-one.net').
-export([start_link/0, init/1, start/3, init/3,
start_listeners/0, start_listener/3, stop_listeners/0,
stop_listener/2, parse_listener_portip/2,
add_listener/3, delete_listener/2, transform_options/1,
validate_cfg/1, opt_type/1, config_reloaded/0]).
-include("ejabberd.hrl").
-include("logger.hrl").
%% We do not block on send anymore.
-define(TCP_SEND_TIMEOUT, 15000).
start_link() ->
supervisor:start_link({local, ?MODULE}, ?MODULE, []).
init(_) ->
ets:new(?MODULE, [named_table, public]),
ejabberd_hooks:add(config_reloaded, ?MODULE, config_reloaded, 50),
{ok, {{one_for_one, 10, 1}, listeners_childspec()}}.
listeners_childspec() ->
Ls = ejabberd_config:get_option(listen, []),
Specs = lists:map(
fun({Port, Module, Opts}) ->
ets:insert(?MODULE, {Port, Module, Opts}),
{Port,
{?MODULE, start, [Port, Module, Opts]},
transient,
brutal_kill,
worker,
[?MODULE]}
end, Ls),
report_duplicated_portips(Ls),
Specs.
start_listeners() ->
lists:foreach(
fun(Spec) ->
supervisor:start_child(?MODULE, Spec)
end, listeners_childspec()).
report_duplicated_portips(L) ->
LKeys = [Port || {Port, _, _} <- L],
LNoDupsKeys = proplists:get_keys(L),
case LKeys -- LNoDupsKeys of
[] -> ok;
Dups ->
?CRITICAL_MSG("In the ejabberd configuration there are duplicated "
"Port number + IP address:~n ~p",
[Dups])
end.
start(Port, Module, Opts) ->
NewOpts = validate_module_options(Module, Opts),
%% Check if the module is an ejabberd listener or an independent listener
case Module:socket_type() of
independent -> Module:start_listener(Port, NewOpts);
_ -> start_dependent(Port, Module, NewOpts)
end.
%% @spec(Port, Module, Opts) -> {ok, Pid} | {error, ErrorMessage}
start_dependent(Port, Module, Opts) ->
proc_lib:start_link(?MODULE, init, [Port, Module, Opts]).
init(PortIP, Module, RawOpts) ->
{Port, IPT, IPS, IPV, Proto, OptsClean} = parse_listener_portip(PortIP, RawOpts),
{Opts, SockOpts} = prepare_opts(IPT, IPV, OptsClean),
if Proto == udp ->
init_udp(PortIP, Module, Opts, SockOpts, Port, IPS);
true ->
init_tcp(PortIP, Module, Opts, SockOpts, Port, IPS)
end.
init_udp(PortIP, Module, Opts, SockOpts, Port, IPS) ->
case gen_udp:open(Port, [binary,
{active, false},
{reuseaddr, true} |
SockOpts]) of
{ok, Socket} ->
%% Inform my parent that this port was opened succesfully
proc_lib:init_ack({ok, self()}),
application:ensure_started(ejabberd),
start_module_sup(Port, Module),
?INFO_MSG("Start accepting UDP connections at ~s for ~p",
[format_portip(PortIP), Module]),
case erlang:function_exported(Module, udp_init, 2) of
false ->
udp_recv(Socket, Module, Opts);
true ->
case catch Module:udp_init(Socket, Opts) of
{'EXIT', _} = Err ->
?ERROR_MSG("failed to process callback function "
"~p:~s(~p, ~p): ~p",
[Module, udp_init, Socket, Opts, Err]),
udp_recv(Socket, Module, Opts);
NewOpts ->
udp_recv(Socket, Module, NewOpts)
end
end;
{error, Reason} ->
socket_error(Reason, PortIP, Module, SockOpts, Port, IPS)
end.
init_tcp(PortIP, Module, Opts, SockOpts, Port, IPS) ->
ListenSocket = listen_tcp(PortIP, Module, SockOpts, Port, IPS),
%% Inform my parent that this port was opened succesfully
proc_lib:init_ack({ok, self()}),
application:ensure_started(ejabberd),
start_module_sup(Port, Module),
?INFO_MSG("Start accepting TCP connections at ~s for ~p",
[format_portip(PortIP), Module]),
case erlang:function_exported(Module, tcp_init, 2) of
false ->
accept(ListenSocket, Module, Opts);
true ->
case catch Module:tcp_init(ListenSocket, Opts) of
{'EXIT', _} = Err ->
?ERROR_MSG("failed to process callback function "
"~p:~s(~p, ~p): ~p",
[Module, tcp_init, ListenSocket, Opts, Err]),
accept(ListenSocket, Module, Opts);
NewOpts ->
accept(ListenSocket, Module, NewOpts)
end
end.
listen_tcp(PortIP, Module, SockOpts, Port, IPS) ->
Res = gen_tcp:listen(Port, [binary,
{packet, 0},
{active, false},
{reuseaddr, true},
{nodelay, true},
{send_timeout, ?TCP_SEND_TIMEOUT},
{send_timeout_close, true},
{keepalive, true} |
SockOpts]),
case Res of
{ok, ListenSocket} ->
ListenSocket;
{error, Reason} ->
socket_error(Reason, PortIP, Module, SockOpts, Port, IPS)
end.
%% @spec (PortIP, Opts) -> {Port, IPT, IPS, IPV, OptsClean}
%% where
%% PortIP = Port | {Port, IPT | IPS}
%% Port = integer()
%% IPT = tuple()
%% IPS = string()
%% IPV = inet | inet6
%% Opts = [IPV | {ip, IPT} | atom() | tuple()]
%% OptsClean = [atom() | tuple()]
%% @doc Parse any kind of ejabberd listener specification.
%% The parsed options are returned in several formats.
%% OptsClean does not include inet/inet6 or ip options.
%% Opts can include the options inet6 and {ip, Tuple},
%% but they are only used when no IP address was specified in the PortIP.
%% The IP version (either IPv4 or IPv6) is inferred from the IP address type,
%% so the option inet/inet6 is only used when no IP is specified at all.
parse_listener_portip(PortIP, Opts) ->
{IPOpt, Opts2} = strip_ip_option(Opts),
{IPVOpt, OptsClean} = case proplists:get_bool(inet6, Opts2) of
true -> {inet6, proplists:delete(inet6, Opts2)};
false -> {inet, Opts2}
end,
{Port, IPT, IPS, Proto} =
case add_proto(PortIP, Opts) of
{P, Prot} ->
T = get_ip_tuple(IPOpt, IPVOpt),
S = misc:ip_to_list(T),
{P, T, S, Prot};
{P, T, Prot} when is_integer(P) and is_tuple(T) ->
S = misc:ip_to_list(T),
{P, T, S, Prot};
{P, S, Prot} when is_integer(P) and is_binary(S) ->
[S | _] = str:tokens(S, <<"/">>),
{ok, T} = inet_parse:address(binary_to_list(S)),
{P, T, S, Prot}
end,
IPV = case tuple_size(IPT) of
4 -> inet;
8 -> inet6
end,
{Port, IPT, IPS, IPV, Proto, OptsClean}.
prepare_opts(IPT, IPV, OptsClean) ->
%% The first inet|inet6 and the last {ip, _} work,
%% so overriding those in Opts
Opts = [IPV | OptsClean] ++ [{ip, IPT}],
SockOpts = lists:filter(fun({ip, _}) -> true;
(inet6) -> true;
(inet) -> true;
({backlog, _}) -> true;
(_) -> false
end, Opts),
{Opts, SockOpts}.
add_proto(Port, Opts) when is_integer(Port) ->
{Port, get_proto(Opts)};
add_proto({Port, Proto}, _Opts) when is_atom(Proto) ->
{Port, normalize_proto(Proto)};
add_proto({Port, Addr}, Opts) ->
{Port, Addr, get_proto(Opts)};
add_proto({Port, Addr, Proto}, _Opts) ->
{Port, Addr, normalize_proto(Proto)}.
strip_ip_option(Opts) ->
{IPL, OptsNoIP} = lists:partition(
fun({ip, _}) -> true;
(_) -> false
end,
Opts),
case IPL of
%% Only the first ip option is considered
[{ip, T1} | _] ->
{T1, OptsNoIP};
[] ->
{no_ip_option, OptsNoIP}
end.
get_ip_tuple(no_ip_option, inet) ->
{0, 0, 0, 0};
get_ip_tuple(no_ip_option, inet6) ->
{0, 0, 0, 0, 0, 0, 0, 0};
get_ip_tuple(IPOpt, _IPVOpt) ->
IPOpt.
accept(ListenSocket, Module, Opts) ->
IntervalOpt =
case proplists:get_value(accept_interval, Opts) of
[{linear, [I1_, T1_, T2_, I2_]}] ->
{linear, I1_, T1_, T2_, I2_};
I_ -> I_
end,
Interval =
case IntervalOpt of
undefined ->
0;
I when is_integer(I), I >= 0 ->
I;
{linear, I1, T1, T2, I2}
when is_integer(I1),
is_integer(T1),
is_integer(T2),
is_integer(I2),
I1 >= 0,
I2 >= 0,
T2 > 0 ->
{MSec, Sec, _USec} = os:timestamp(),
TS = MSec * 1000000 + Sec,
{linear, I1, TS + T1, T2, I2};
I ->
?WARNING_MSG("There is a problem in the configuration: "
"~p is a wrong accept_interval value. "
"Using 0 as fallback",
[I]),
0
end,
accept(ListenSocket, Module, Opts, Interval).
accept(ListenSocket, Module, Opts, Interval) ->
NewInterval = check_rate_limit(Interval),
case gen_tcp:accept(ListenSocket) of
{ok, Socket} ->
case {inet:sockname(Socket), inet:peername(Socket)} of
{{ok, {Addr, Port}}, {ok, {PAddr, PPort}}} ->
Receiver = case xmpp_socket:start(Module,
gen_tcp, Socket, Opts) of
{ok, RecvPid} -> RecvPid;
_ -> none
end,
?INFO_MSG("(~p) Accepted connection ~s:~p -> ~s:~p",
[Receiver,
ejabberd_config:may_hide_data(inet_parse:ntoa(PAddr)),
PPort, inet_parse:ntoa(Addr), Port]);
_ ->
gen_tcp:close(Socket)
end,
accept(ListenSocket, Module, Opts, NewInterval);
{error, Reason} ->
?ERROR_MSG("(~w) Failed TCP accept: ~s",
[ListenSocket, inet:format_error(Reason)]),
accept(ListenSocket, Module, Opts, NewInterval)
end.
udp_recv(Socket, Module, Opts) ->
case gen_udp:recv(Socket, 0) of
{ok, {Addr, Port, Packet}} ->
case catch Module:udp_recv(Socket, Addr, Port, Packet, Opts) of
{'EXIT', Reason} ->
?ERROR_MSG("failed to process UDP packet:~n"
"** Source: {~p, ~p}~n"
"** Reason: ~p~n** Packet: ~p",
[Addr, Port, Reason, Packet]),
udp_recv(Socket, Module, Opts);
NewOpts ->
udp_recv(Socket, Module, NewOpts)
end;
{error, Reason} ->
?ERROR_MSG("unexpected UDP error: ~s", [format_error(Reason)]),
throw({error, Reason})
end.
%% @spec (Port, Module, Opts) -> {ok, Pid} | {error, Error}
start_listener(Port, Module, Opts) ->
case start_listener2(Port, Module, Opts) of
{ok, _Pid} = R -> R;
{error, {{'EXIT', {undef, [{M, _F, _A}|_]}}, _} = Error} ->
?ERROR_MSG("Error starting the ejabberd listener: ~p.~n"
"It could not be loaded or is not an ejabberd listener.~n"
"Error: ~p~n", [Module, Error]),
{error, {module_not_available, M}};
{error, {already_started, Pid}} ->
{ok, Pid};
{error, Error} ->
{error, Error}
end.
%% @spec (Port, Module, Opts) -> {ok, Pid} | {error, Error}
start_listener2(Port, Module, Opts) ->
%% It is only required to start the supervisor in some cases.
%% But it doesn't hurt to attempt to start it for any listener.
%% So, it's normal (and harmless) that in most cases this call returns: {error, {already_started, pid()}}
start_listener_sup(Port, Module, Opts).
start_module_sup(_Port, Module) ->
Proc1 = gen_mod:get_module_proc(<<"sup">>, Module),
ChildSpec1 =
{Proc1,
{ejabberd_tmp_sup, start_link, [Proc1, Module]},
permanent,
infinity,
supervisor,
[ejabberd_tmp_sup]},
supervisor:start_child(ejabberd_sup, ChildSpec1).
start_listener_sup(Port, Module, Opts) ->
ChildSpec = {Port,
{?MODULE, start, [Port, Module, Opts]},
transient,
brutal_kill,
worker,
[?MODULE]},
supervisor:start_child(?MODULE, ChildSpec).
stop_listeners() ->
Ports = ejabberd_config:get_option(listen, []),
lists:foreach(
fun({PortIpNetp, Module, _Opts}) ->
delete_listener(PortIpNetp, Module)
end,
Ports).
stop_listener({_, _, Transport} = PortIP, Module) ->
case supervisor:terminate_child(?MODULE, PortIP) of
ok ->
?INFO_MSG("Stop accepting ~s connections at ~s for ~p",
[case Transport of udp -> "UDP"; tcp -> "TCP" end,
format_portip(PortIP), Module]),
ets:delete(?MODULE, PortIP),
supervisor:delete_child(?MODULE, PortIP);
Err ->
Err
end.
add_listener(PortIP, Module, Opts) ->
{Port, IPT, _, _, Proto, _} = parse_listener_portip(PortIP, Opts),
PortIP1 = {Port, IPT, Proto},
case start_listener(PortIP1, Module, Opts) of
{ok, _Pid} ->
ok;
{error, {already_started, _Pid}} ->
{error, {already_started, PortIP}};
{error, Error} ->
{error, Error}
end.
delete_listener(PortIP, Module) ->
delete_listener(PortIP, Module, []).
%% @spec (PortIP, Module, Opts) -> ok
%% where
%% PortIP = {Port, IPT | IPS}
%% Port = integer()
%% IPT = tuple()
%% IPS = string()
%% Module = atom()
%% Opts = [term()]
delete_listener(PortIP, Module, Opts) ->
{Port, IPT, _, _, Proto, _} = parse_listener_portip(PortIP, Opts),
PortIP1 = {Port, IPT, Proto},
stop_listener(PortIP1, Module).
config_reloaded() ->
New = ejabberd_config:get_option(listen, []),
Old = ets:tab2list(?MODULE),
lists:foreach(
fun({PortIP, Module, _Opts}) ->
case lists:keyfind(PortIP, 1, New) of
false ->
stop_listener(PortIP, Module);
_ ->
ok
end
end, Old),
lists:foreach(
fun({PortIP, Module, Opts}) ->
case lists:keyfind(PortIP, 1, Old) of
{_, Module, Opts} ->
ok;
{_, OldModule, _} ->
stop_listener(PortIP, OldModule),
ets:insert(?MODULE, {PortIP, Module, Opts}),
start_listener(PortIP, Module, Opts);
false ->
ets:insert(?MODULE, {PortIP, Module, Opts}),
start_listener(PortIP, Module, Opts)
end
end, New).
%%%
%%% Check options
%%%
get_proto(Opts) ->
case proplists:get_value(proto, Opts) of
undefined ->
tcp;
Proto ->
normalize_proto(Proto)
end.
normalize_proto(tcp) -> tcp;
normalize_proto(udp) -> udp;
normalize_proto(UnknownProto) ->
?WARNING_MSG("There is a problem in the configuration: "
"~p is an unknown IP protocol. Using tcp as fallback",
[UnknownProto]),
tcp.
socket_error(Reason, PortIP, Module, SockOpts, Port, IPS) ->
ReasonT = case Reason of
eaddrnotavail ->
"IP address not available: " ++ binary_to_list(IPS);
eaddrinuse ->
"IP address and port number already used: "
++binary_to_list(IPS)++" "++integer_to_list(Port);
_ ->
format_error(Reason)
end,
?ERROR_MSG("Failed to open socket:~n ~p~nReason: ~s",
[{Port, Module, SockOpts}, ReasonT]),
throw({Reason, PortIP}).
format_error(Reason) ->
case inet:format_error(Reason) of
"unknown POSIX error" ->
atom_to_list(Reason);
ReasonStr ->
ReasonStr
end.
format_portip({Port, IP, _Transport}) ->
IPStr = case tuple_size(IP) of
4 -> inet:ntoa(IP);
8 -> "[" ++ inet:ntoa(IP) ++ "]"
end,
IPStr ++ ":" ++ integer_to_list(Port).
check_rate_limit(Interval) ->
NewInterval = receive
{rate_limit, AcceptInterval} ->
AcceptInterval
after 0 ->
Interval
end,
case NewInterval of
0 -> ok;
Ms when is_integer(Ms) ->
timer:sleep(Ms);
{linear, I1, T1, T2, I2} ->
{MSec, Sec, _USec} = os:timestamp(),
TS = MSec * 1000000 + Sec,
I =
if
TS =< T1 -> I1;
TS >= T1 + T2 -> I2;
true ->
round((I2 - I1) * (TS - T1) / T2 + I1)
end,
timer:sleep(I)
end,
NewInterval.
-define(IS_CHAR(C), (is_integer(C) and (C >= 0) and (C =< 255))).
-define(IS_UINT(U), (is_integer(U) and (U >= 0) and (U =< 65535))).
-define(IS_PORT(P), (is_integer(P) and (P > 0) and (P =< 65535))).
-define(IS_TRANSPORT(T), ((T == tcp) or (T == udp))).
transform_option({{Port, IP, Transport}, Mod, Opts}) ->
IPStr = if is_tuple(IP) ->
list_to_binary(inet_parse:ntoa(IP));
true ->
IP
end,
Opts1 = lists:map(
fun({ip, IPT}) when is_tuple(IPT) ->
{ip, list_to_binary(inet_parse:ntoa(IP))};
(ssl) -> {tls, true};
(A) when is_atom(A) -> {A, true};
(Opt) -> Opt
end, Opts),
Opts2 = lists:foldl(
fun(Opt, Acc) ->
try
Mod:transform_listen_option(Opt, Acc)
catch error:undef ->
[Opt|Acc]
end
end, [], Opts1),
TransportOpt = if Transport == tcp -> [];
true -> [{transport, Transport}]
end,
IPOpt = if IPStr == <<"0.0.0.0">> -> [];
true -> [{ip, IPStr}]
end,
IPOpt ++ TransportOpt ++ [{port, Port}, {module, Mod} | Opts2];
transform_option({{Port, Transport}, Mod, Opts})
when ?IS_TRANSPORT(Transport) ->
transform_option({{Port, all_zero_ip(Opts), Transport}, Mod, Opts});
transform_option({{Port, IP}, Mod, Opts}) ->
transform_option({{Port, IP, tcp}, Mod, Opts});
transform_option({Port, Mod, Opts}) ->
transform_option({{Port, all_zero_ip(Opts), tcp}, Mod, Opts});
transform_option(Opt) ->
Opt.
transform_options(Opts) ->
lists:foldl(fun transform_options/2, [], Opts).
transform_options({listen, LOpts}, Opts) ->
[{listen, lists:map(fun transform_option/1, LOpts)} | Opts];
transform_options(Opt, Opts) ->
[Opt|Opts].
-spec validate_module_options(module(), [{atom(), any()}]) -> [{atom(), any()}].
validate_module_options(Module, Opts) ->
try Module:listen_opt_type('') of
_ ->
lists:filtermap(
fun({Opt, Val}) ->
case validate_module_option(Module, Opt, Val) of
{ok, NewVal} -> {true, {Opt, NewVal}};
error -> false
end
end, Opts)
catch _:undef ->
?WARNING_MSG("module '~s' doesn't export listen_opt_type/1",
[Module]),
Opts
end.
-spec validate_module_option(module(), atom(), any()) -> {ok, any()} | error.
validate_module_option(Module, Opt, Val) ->
case Module:listen_opt_type(Opt) of
VFun when is_function(VFun) ->
try VFun(Val) of
NewVal -> {ok, NewVal}
catch {invalid_syntax, Error} ->
?ERROR_MSG("ignoring listen option '~s' with "
"invalid value: ~p: ~s",
[Opt, Val, Error]),
error;
_:_ ->
?ERROR_MSG("ignoring listen option '~s' with "
"invalid value: ~p",
[Opt, Val]),
error
end;
[] ->
?ERROR_MSG("unknown listen option '~s' for '~s' will be likely "
"ignored because the listening module doesn't have "
"any options", [Opt, Module]),
{ok, Val};
KnownOpts when is_list(KnownOpts) ->
?ERROR_MSG("unknown listen option '~s' for '~s' will be likely "
"ignored, available options are: ~s",
[Opt, Module, misc:join_atoms(KnownOpts, <<", ">>)]),
{ok, Val}
end.
-type transport() :: udp | tcp.
-type port_ip_transport() :: inet:port_number() |
{inet:port_number(), transport()} |
{inet:port_number(), inet:ip_address()} |
{inet:port_number(), inet:ip_address(),
transport()}.
-spec validate_cfg(list()) -> [{port_ip_transport(), module(), list()}].
validate_cfg(L) ->
lists:map(
fun(LOpts) ->
lists:foldl(
fun({port, Port}, {{_, IP, T}, Mod, Opts}) ->
true = ?IS_PORT(Port),
{{Port, IP, T}, Mod, Opts};
({ip, IP}, {{Port, _, T}, Mod, Opts}) ->
{{Port, prepare_ip(IP), T}, Mod, Opts};
({transport, T}, {{Port, IP, _}, Mod, Opts}) ->
true = ?IS_TRANSPORT(T),
{{Port, IP, T}, Mod, Opts};
({module, Mod}, {Port, _, Opts}) ->
{Port, Mod, Opts};
(Opt, {Port, Mod, Opts}) ->
{Port, Mod, [Opt|Opts]}
end, {{5222, all_zero_ip(LOpts), tcp}, ejabberd_c2s, []}, LOpts)
end, L).
prepare_ip({A, B, C, D} = IP)
when ?IS_CHAR(A) and ?IS_CHAR(B) and ?IS_CHAR(C) and ?IS_CHAR(D) ->
IP;
prepare_ip({A, B, C, D, E, F, G, H} = IP)
when ?IS_UINT(A) and ?IS_UINT(B) and ?IS_UINT(C) and ?IS_UINT(D)
and ?IS_UINT(E) and ?IS_UINT(F) and ?IS_UINT(G) and ?IS_UINT(H) ->
IP;
prepare_ip(IP) when is_list(IP) ->
{ok, Addr} = inet_parse:address(IP),
Addr;
prepare_ip(IP) when is_binary(IP) ->
prepare_ip(binary_to_list(IP)).
all_zero_ip(Opts) ->
case proplists:get_bool(inet6, Opts) of
true -> {0,0,0,0,0,0,0,0};
false -> {0,0,0,0}
end.
opt_type(listen) -> fun validate_cfg/1;
opt_type(_) -> [listen].
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