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xmpp.chapril.org-ejabberd/src/mod_mqtt.erl

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%%%-------------------------------------------------------------------
%%% @author Evgeny Khramtsov <ekhramtsov@process-one.net>
%%% @copyright (C) 2002-2024 ProcessOne, SARL. All Rights Reserved.
%%%
%%% Licensed under the Apache License, Version 2.0 (the "License");
%%% you may not use this file except in compliance with the License.
%%% You may obtain a copy of the License at
%%%
%%% http://www.apache.org/licenses/LICENSE-2.0
%%%
%%% Unless required by applicable law or agreed to in writing, software
%%% distributed under the License is distributed on an "AS IS" BASIS,
%%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%%% See the License for the specific language governing permissions and
%%% limitations under the License.
%%%
%%%-------------------------------------------------------------------
-module(mod_mqtt).
-behaviour(p1_server).
-behaviour(gen_mod).
-behaviour(ejabberd_listener).
-dialyzer({no_improper_lists, join_filter/1}).
%% gen_mod API
-export([start/2, stop/1, reload/3, depends/2, mod_options/1, mod_opt_type/1]).
-export([mod_doc/0]).
%% gen_server callbacks
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
%% ejabberd_listener API
-export([start/3, start_link/3, listen_opt_type/1, listen_options/0, accept/1]).
%% ejabberd_http API
-export([socket_handoff/3]).
%% Legacy ejabberd_listener API
-export([become_controller/2, socket_type/0]).
%% API
-export([open_session/1, close_session/1, lookup_session/1,
publish/3, subscribe/4, unsubscribe/2, select_retained/4,
check_publish_access/2, check_subscribe_access/2]).
%% ejabberd_hooks
-export([remove_user/2]).
-include("logger.hrl").
-include("mqtt.hrl").
-include("translate.hrl").
-define(MQTT_TOPIC_CACHE, mqtt_topic_cache).
-define(MQTT_PAYLOAD_CACHE, mqtt_payload_cache).
-type continuation() :: term().
-type seconds() :: non_neg_integer().
%% RAM backend callbacks
-callback init() -> ok | {error, any()}.
-callback open_session(jid:ljid()) -> ok | {error, db_failure}.
-callback close_session(jid:ljid()) -> ok | {error, db_failure}.
-callback lookup_session(jid:ljid()) -> {ok, pid()} | {error, notfound | db_failure}.
-callback get_sessions(binary(), binary()) -> [jid:ljid()].
-callback subscribe(jid:ljid(), binary(), sub_opts(), non_neg_integer()) -> ok | {error, db_failure}.
-callback unsubscribe(jid:ljid(), binary()) -> ok | {error, notfound | db_failure}.
-callback find_subscriber(binary(), binary() | continuation()) ->
{ok, {pid(), qos()}, continuation()} | {error, notfound | db_failure}.
%% Disc backend callbacks
-callback init(binary(), gen_mod:opts()) -> ok | {error, any()}.
-callback publish(jid:ljid(), binary(), binary(), qos(), properties(), seconds()) ->
ok | {error, db_failure}.
-callback delete_published(jid:ljid(), binary()) -> ok | {error, db_failure}.
-callback lookup_published(jid:ljid(), binary()) ->
{ok, {binary(), qos(), properties(), seconds()}} |
{error, notfound | db_failure}.
-callback list_topics(binary()) -> {ok, [binary()]} | {error, db_failure}.
-callback use_cache(binary()) -> boolean().
-callback cache_nodes(binary()) -> [node()].
-optional_callbacks([use_cache/1, cache_nodes/1]).
-record(state, {host :: binary()}).
%%%===================================================================
%%% API
%%%===================================================================
start(SockMod, Sock, ListenOpts) ->
mod_mqtt_session:start(SockMod, Sock, ListenOpts).
start(Host, Opts) ->
gen_mod:start_child(?MODULE, Host, Opts).
start_link(SockMod, Sock, ListenOpts) ->
mod_mqtt_session:start_link(SockMod, Sock, ListenOpts).
stop(Host) ->
gen_mod:stop_child(?MODULE, Host).
reload(_Host, _NewOpts, _OldOpts) ->
ok.
depends(_Host, _Opts) ->
[].
socket_type() ->
raw.
become_controller(Pid, _) ->
accept(Pid).
accept(Pid) ->
mod_mqtt_session:accept(Pid).
socket_handoff(LocalPath, Request, Opts) ->
mod_mqtt_ws:socket_handoff(LocalPath, Request, Opts).
open_session({U, S, R}) ->
Mod = gen_mod:ram_db_mod(S, ?MODULE),
Mod:open_session({U, S, R}).
close_session({U, S, R}) ->
Mod = gen_mod:ram_db_mod(S, ?MODULE),
Mod:close_session({U, S, R}).
lookup_session({U, S, R}) ->
Mod = gen_mod:ram_db_mod(S, ?MODULE),
Mod:lookup_session({U, S, R}).
-spec publish(jid:ljid(), publish(), seconds()) ->
{ok, non_neg_integer()} | {error, db_failure | publish_forbidden}.
publish({_, S, _} = USR, Pkt, ExpiryTime) ->
case check_publish_access(Pkt#publish.topic, USR) of
allow ->
case retain(USR, Pkt, ExpiryTime) of
ok ->
ejabberd_hooks:run(mqtt_publish, S, [USR, Pkt, ExpiryTime]),
Mod = gen_mod:ram_db_mod(S, ?MODULE),
route(Mod, S, Pkt, ExpiryTime);
{error, _} = Err ->
Err
end;
deny ->
{error, publish_forbidden}
end.
-spec subscribe(jid:ljid(), binary(), sub_opts(), non_neg_integer()) ->
ok | {error, db_failure | subscribe_forbidden}.
subscribe({_, S, _} = USR, TopicFilter, SubOpts, ID) ->
Mod = gen_mod:ram_db_mod(S, ?MODULE),
Limit = mod_mqtt_opt:max_topic_depth(S),
case check_topic_depth(TopicFilter, Limit) of
allow ->
case check_subscribe_access(TopicFilter, USR) of
allow ->
ejabberd_hooks:run(mqtt_subscribe, S, [USR, TopicFilter, SubOpts, ID]),
Mod:subscribe(USR, TopicFilter, SubOpts, ID);
deny ->
{error, subscribe_forbidden}
end;
deny ->
{error, subscribe_forbidden}
end.
-spec unsubscribe(jid:ljid(), binary()) -> ok | {error, notfound | db_failure}.
unsubscribe({U, S, R}, Topic) ->
Mod = gen_mod:ram_db_mod(S, ?MODULE),
ejabberd_hooks:run(mqtt_unsubscribe, S, [{U, S, R}, Topic]),
Mod:unsubscribe({U, S, R}, Topic).
-spec select_retained(jid:ljid(), binary(), qos(), non_neg_integer()) ->
[{publish(), seconds()}].
select_retained({_, S, _} = USR, TopicFilter, QoS, SubID) ->
Mod = gen_mod:db_mod(S, ?MODULE),
Limit = mod_mqtt_opt:match_retained_limit(S),
select_retained(Mod, USR, TopicFilter, QoS, SubID, Limit).
remove_user(User, Server) ->
LUser = jid:nodeprep(User),
LServer = jid:nameprep(Server),
Mod = gen_mod:ram_db_mod(LServer, ?MODULE),
Sessions = Mod:get_sessions(LUser, LServer),
[close_session(Session) || Session <- Sessions].
%%%===================================================================
%%% gen_server callbacks
%%%===================================================================
init([Host|_]) ->
Opts = gen_mod:get_module_opts(Host, ?MODULE),
Mod = gen_mod:db_mod(Opts, ?MODULE),
RMod = gen_mod:ram_db_mod(Opts, ?MODULE),
ejabberd_hooks:add(remove_user, Host, ?MODULE, remove_user, 50),
try
ok = Mod:init(Host, Opts),
ok = RMod:init(),
ok = init_cache(Mod, Host, Opts),
{ok, #state{host = Host}}
catch _:{badmatch, {error, Why}} ->
{stop, Why}
end.
handle_call(Request, From, State) ->
?WARNING_MSG("Unexpected call from ~p: ~p", [From, Request]),
{noreply, State}.
handle_cast(Msg, State) ->
?WARNING_MSG("Unexpected cast: ~p", [Msg]),
{noreply, State}.
handle_info(Info, State) ->
?WARNING_MSG("Unexpected info: ~p", [Info]),
{noreply, State}.
terminate(_Reason, #state{host = Host}) ->
ejabberd_hooks:delete(remove_user, Host, ?MODULE, remove_user, 50),
ok.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%%%===================================================================
%%% Options
%%%===================================================================
-spec mod_options(binary()) -> [{access_publish, [{[binary()], acl:acl()}]} |
{access_subscribe, [{[binary()], acl:acl()}]} |
{atom(), any()}].
mod_options(Host) ->
[{match_retained_limit, 1000},
{max_topic_depth, 8},
{max_topic_aliases, 100},
{session_expiry, timer:minutes(5)},
{max_queue, 5000},
{access_subscribe, []},
{access_publish, []},
{db_type, ejabberd_config:default_db(Host, ?MODULE)},
{ram_db_type, ejabberd_config:default_ram_db(Host, ?MODULE)},
{queue_type, ejabberd_option:queue_type(Host)},
{use_cache, ejabberd_option:use_cache(Host)},
{cache_size, ejabberd_option:cache_size(Host)},
{cache_missed, ejabberd_option:cache_missed(Host)},
{cache_life_time, ejabberd_option:cache_life_time(Host)}].
mod_opt_type(max_queue) ->
econf:pos_int(unlimited);
mod_opt_type(session_expiry) ->
econf:either(
econf:int(0, 0),
econf:timeout(second));
mod_opt_type(match_retained_limit) ->
econf:pos_int(infinity);
mod_opt_type(max_topic_depth) ->
econf:pos_int(infinity);
mod_opt_type(max_topic_aliases) ->
econf:int(0, 65535);
mod_opt_type(access_subscribe) ->
topic_access_validator();
mod_opt_type(access_publish) ->
topic_access_validator();
mod_opt_type(queue_type) ->
econf:queue_type();
mod_opt_type(db_type) ->
econf:db_type(?MODULE);
mod_opt_type(ram_db_type) ->
econf:db_type(?MODULE);
mod_opt_type(use_cache) ->
econf:bool();
mod_opt_type(cache_size) ->
econf:pos_int(infinity);
mod_opt_type(cache_missed) ->
econf:bool();
mod_opt_type(cache_life_time) ->
econf:timeout(second, infinity).
listen_opt_type(tls_verify) ->
econf:bool();
listen_opt_type(max_payload_size) ->
econf:pos_int(infinity).
listen_options() ->
[{max_fsm_queue, 10000},
{max_payload_size, infinity},
{tls, false},
{tls_verify, false}].
%%%===================================================================
%%% Doc
%%%===================================================================
mod_doc() ->
#{desc =>
?T("This module adds "
"_`../guide/mqtt/index.md|support for the MQTT`_ "
"protocol version '3.1.1' and '5.0'. Remember to configure "
"'mod_mqtt' in 'modules' and 'listen' sections."),
opts =>
[{access_subscribe,
#{value => "{TopicFilter: AccessName}",
desc =>
?T("Access rules to restrict access to topics "
"for subscribers. By default there are no restrictions.")}},
{access_publish,
#{value => "{TopicFilter: AccessName}",
desc =>
?T("Access rules to restrict access to topics "
"for publishers. By default there are no restrictions.")}},
{max_queue,
#{value => ?T("Size"),
desc =>
?T("Maximum queue size for outgoing packets. "
"The default value is '5000'.")}},
{session_expiry,
#{value => "timeout()",
desc =>
?T("The option specifies how long to wait for "
"an MQTT session resumption. When '0' is set, "
"the session gets destroyed when the underlying "
"client connection is closed. The default value is "
"'5' minutes.")}},
{max_topic_depth,
#{value => ?T("Depth"),
desc =>
?T("The maximum topic depth, i.e. the number of "
"slashes ('/') in the topic. The default "
"value is '8'.")}},
{max_topic_aliases,
#{value => "0..65535",
desc =>
?T("The maximum number of aliases a client "
"is able to associate with the topics. "
"The default value is '100'.")}},
{match_retained_limit,
#{value => "pos_integer() | infinity",
desc =>
?T("The option limits the number of retained messages "
"returned to a client when it subscribes to some "
"topic filter. The default value is '1000'.")}},
{queue_type,
#{value => "ram | file",
desc =>
?T("Same as top-level _`queue_type`_ option, "
"but applied to this module only.")}},
{ram_db_type,
#{value => "mnesia",
desc =>
?T("Same as top-level _`default_ram_db`_ option, "
"but applied to this module only.")}},
{db_type,
#{value => "mnesia | sql",
desc =>
?T("Same as top-level _`default_db`_ option, "
"but applied to this module only.")}},
{use_cache,
#{value => "true | false",
desc =>
?T("Same as top-level _`use_cache`_ option, "
"but applied to this module only.")}},
{cache_size,
#{value => "pos_integer() | infinity",
desc =>
?T("Same as top-level _`cache_size`_ option, "
"but applied to this module only.")}},
{cache_missed,
#{value => "true | false",
desc =>
?T("Same as top-level _`cache_missed`_ option, "
"but applied to this module only.")}},
{cache_life_time,
#{value => "timeout()",
desc =>
?T("Same as top-level _`cache_life_time`_ option, "
"but applied to this module only.")}}]}.
%%%===================================================================
%%% Internal functions
%%%===================================================================
route(Mod, LServer, Pkt, ExpiryTime) ->
route(Mod, LServer, Pkt, ExpiryTime, Pkt#publish.topic, 0).
route(Mod, LServer, Pkt, ExpiryTime, Continuation, Num) ->
case Mod:find_subscriber(LServer, Continuation) of
{ok, {Pid, #sub_opts{no_local = true}, _}, Continuation1}
when Pid == self() ->
route(Mod, LServer, Pkt, ExpiryTime, Continuation1, Num);
{ok, {Pid, SubOpts, ID}, Continuation1} ->
?DEBUG("Route to ~p: ~ts", [Pid, Pkt#publish.topic]),
MinQoS = min(SubOpts#sub_opts.qos, Pkt#publish.qos),
Retain = case SubOpts#sub_opts.retain_as_published of
false -> false;
true -> Pkt#publish.retain
end,
Props = set_sub_id(ID, Pkt#publish.properties),
mod_mqtt_session:route(
Pid, {Pkt#publish{qos = MinQoS,
dup = false,
retain = Retain,
properties = Props},
ExpiryTime}),
route(Mod, LServer, Pkt, ExpiryTime, Continuation1, Num+1);
{error, _} ->
{ok, Num}
end.
select_retained(Mod, {_, LServer, _} = USR, TopicFilter, QoS, SubID, Limit) ->
Topics = match_topics(TopicFilter, LServer, Limit),
lists:filtermap(
fun({{Filter, _}, Topic}) ->
case lookup_published(Mod, USR, Topic) of
{ok, {Payload, QoS1, Props, ExpiryTime}} ->
Props1 = set_sub_id(SubID, Props),
{true, {#publish{topic = Topic,
payload = Payload,
retain = true,
properties = Props1,
qos = min(QoS, QoS1)},
ExpiryTime}};
error ->
ets:delete(?MQTT_TOPIC_CACHE, {Filter, LServer}),
false;
_ ->
false
end
end, Topics).
match_topics(Topic, LServer, Limit) ->
Filter = topic_filter(Topic),
case Limit of
infinity ->
ets:match_object(?MQTT_TOPIC_CACHE, {{Filter, LServer}, '_'});
_ ->
case ets:select(?MQTT_TOPIC_CACHE,
[{{{Filter, LServer}, '_'}, [], ['$_']}], Limit) of
{Topics, _} -> Topics;
'$end_of_table' -> []
end
end.
retain({_, S, _} = USR, #publish{retain = true,
topic = Topic, payload = Data,
qos = QoS, properties = Props},
ExpiryTime) ->
Mod = gen_mod:db_mod(S, ?MODULE),
TopicKey = topic_key(Topic),
case Data of
<<>> ->
ets:delete(?MQTT_TOPIC_CACHE, {TopicKey, S}),
case use_cache(Mod, S) of
true ->
ets_cache:delete(?MQTT_PAYLOAD_CACHE, {S, Topic},
cache_nodes(Mod, S));
false ->
ok
end,
Mod:delete_published(USR, Topic);
_ ->
ets:insert(?MQTT_TOPIC_CACHE, {{TopicKey, S}, Topic}),
case use_cache(Mod, S) of
true ->
case ets_cache:update(
?MQTT_PAYLOAD_CACHE, {S, Topic},
{ok, {Data, QoS, Props, ExpiryTime}},
fun() ->
Mod:publish(USR, Topic, Data,
QoS, Props, ExpiryTime)
end, cache_nodes(Mod, S)) of
{ok, _} -> ok;
{error, _} = Err -> Err
end;
false ->
Mod:publish(USR, Topic, Data, QoS, Props, ExpiryTime)
end
end;
retain(_, _, _) ->
ok.
lookup_published(Mod, {_, LServer, _} = USR, Topic) ->
case use_cache(Mod, LServer) of
true ->
ets_cache:lookup(
?MQTT_PAYLOAD_CACHE, {LServer, Topic},
fun() ->
Mod:lookup_published(USR, Topic)
end);
false ->
Mod:lookup_published(USR, Topic)
end.
set_sub_id(0, Props) ->
Props;
set_sub_id(ID, Props) ->
Props#{subscription_identifier => [ID]}.
%%%===================================================================
%%% Matching functions
%%%===================================================================
topic_key(S) ->
Parts = split_path(S),
case join_key(Parts) of
[<<>>|T] -> T;
T -> T
end.
topic_filter(S) ->
Parts = split_path(S),
case join_filter(Parts) of
[<<>>|T] -> T;
T -> T
end.
join_key([X,Y|T]) ->
[X, $/|join_key([Y|T])];
join_key([X]) ->
[X];
join_key([]) ->
[].
join_filter([X, <<$#>>]) ->
[wildcard(X)|'_'];
join_filter([X,Y|T]) ->
[wildcard(X), $/|join_filter([Y|T])];
join_filter([<<>>]) ->
[];
join_filter([<<$#>>]) ->
'_';
join_filter([X]) ->
[wildcard(X)];
join_filter([]) ->
[].
wildcard(<<$+>>) -> '_';
wildcard(Bin) -> Bin.
check_topic_depth(_Topic, infinity) ->
allow;
check_topic_depth(_, N) when N=<0 ->
deny;
check_topic_depth(<<$/, T/binary>>, N) ->
check_topic_depth(T, N-1);
check_topic_depth(<<_, T/binary>>, N) ->
check_topic_depth(T, N);
check_topic_depth(<<>>, _) ->
allow.
split_path(Path) ->
binary:split(Path, <<$/>>, [global]).
%%%===================================================================
%%% Validators
%%%===================================================================
-spec topic_access_validator() -> econf:validator().
topic_access_validator() ->
econf:and_then(
econf:map(
fun(TF) ->
try split_path(mqtt_codec:topic_filter(TF))
catch _:{mqtt_codec, _} = Reason ->
econf:fail(Reason)
end
end,
econf:acl(),
[{return, orddict}]),
fun lists:reverse/1).
%%%===================================================================
%%% ACL checks
%%%===================================================================
check_subscribe_access(Topic, {_, S, _} = USR) ->
Rules = mod_mqtt_opt:access_subscribe(S),
check_access(Topic, USR, Rules).
check_publish_access(<<$$, _/binary>>, _) ->
deny;
check_publish_access(Topic, {_, S, _} = USR) ->
Rules = mod_mqtt_opt:access_publish(S),
check_access(Topic, USR, Rules).
check_access(_, _, []) ->
allow;
check_access(Topic, {U, S, R} = USR, FilterRules) ->
TopicParts = binary:split(Topic, <<$/>>, [global]),
case lists:any(
fun({FilterParts, Rule}) ->
case match(TopicParts, FilterParts, U, S, R) of
true ->
allow == acl:match_rule(S, Rule, USR);
false ->
false
end
end, FilterRules) of
true -> allow;
false -> deny
end.
match(_, [<<"#">>|_], _, _, _) ->
true;
match([], [<<>>, <<"#">>|_], _, _, _) ->
true;
match([_|T1], [<<"+">>|T2], U, S, R) ->
match(T1, T2, U, S, R);
match([H|T1], [<<"%u">>|T2], U, S, R) ->
case jid:nodeprep(H) of
U -> match(T1, T2, U, S, R);
_ -> false
end;
match([H|T1], [<<"%d">>|T2], U, S, R) ->
case jid:nameprep(H) of
S -> match(T1, T2, U, S, R);
_ -> false
end;
match([H|T1], [<<"%c">>|T2], U, S, R) ->
case jid:resourceprep(H) of
R -> match(T1, T2, U, S, R);
_ -> false
end;
match([H|T1], [<<"%g">>|T2], U, S, R) ->
case jid:resourceprep(H) of
H ->
case acl:loaded_shared_roster_module(S) of
undefined -> false;
Mod ->
case Mod:get_group_opts(S, H) of
error -> false;
_ ->
case Mod:is_user_in_group({U, S}, H, S) of
true -> match(T1, T2, U, S, R);
_ -> false
end
end
end;
_ -> false
end;
match([H|T1], [H|T2], U, S, R) ->
match(T1, T2, U, S, R);
match([], [], _, _, _) ->
true;
match(_, _, _, _, _) ->
false.
%%%===================================================================
%%% Cache stuff
%%%===================================================================
-spec init_cache(module(), binary(), gen_mod:opts()) -> ok | {error, db_failure}.
init_cache(Mod, Host, Opts) ->
init_payload_cache(Mod, Host, Opts),
init_topic_cache(Mod, Host).
-spec init_topic_cache(module(), binary()) -> ok | {error, db_failure}.
init_topic_cache(Mod, Host) ->
catch ets:new(?MQTT_TOPIC_CACHE,
[named_table, ordered_set, public,
{heir, erlang:group_leader(), none}]),
?INFO_MSG("Building MQTT cache for ~ts, this may take a while", [Host]),
case Mod:list_topics(Host) of
{ok, Topics} ->
lists:foreach(
fun(Topic) ->
ets:insert(?MQTT_TOPIC_CACHE,
{{topic_key(Topic), Host}, Topic})
end, Topics);
{error, _} = Err ->
Err
end.
-spec init_payload_cache(module(), binary(), gen_mod:opts()) -> ok.
init_payload_cache(Mod, Host, Opts) ->
case use_cache(Mod, Host) of
true ->
CacheOpts = cache_opts(Opts),
ets_cache:new(?MQTT_PAYLOAD_CACHE, CacheOpts);
false ->
ets_cache:delete(?MQTT_PAYLOAD_CACHE)
end.
-spec cache_opts(gen_mod:opts()) -> [proplists:property()].
cache_opts(Opts) ->
MaxSize = mod_mqtt_opt:cache_size(Opts),
CacheMissed = mod_mqtt_opt:cache_missed(Opts),
LifeTime = mod_mqtt_opt:cache_life_time(Opts),
[{max_size, MaxSize}, {cache_missed, CacheMissed}, {life_time, LifeTime}].
-spec use_cache(module(), binary()) -> boolean().
use_cache(Mod, Host) ->
case erlang:function_exported(Mod, use_cache, 1) of
true -> Mod:use_cache(Host);
false -> mod_mqtt_opt:use_cache(Host)
end.
-spec cache_nodes(module(), binary()) -> [node()].
cache_nodes(Mod, Host) ->
case erlang:function_exported(Mod, cache_nodes, 1) of
true -> Mod:cache_nodes(Host);
false -> ejabberd_cluster:get_nodes()
end.
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