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.rebar3
_*
.eunit
*.o
*.beam
*.plt
*.swp
*.swo
.erlang.cookie
ebin
log
erl_crash.dump
.rebar
logs
_build
.idea
*.iml
rebar3.crashdump
*~

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emqtt
=====
An OTP library
Build
-----
$ rebar3 compile

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%%--------------------------------------------------------------------
%% Copyright (c) 2020 EMQ Technologies Co., Ltd. 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.
%%--------------------------------------------------------------------
-ifndef(EMQTT_HRL).
-define(EMQTT_HRL, true).
%%--------------------------------------------------------------------
%% MQTT Protocol Version and Names
%%--------------------------------------------------------------------
-define(MQTT_PROTO_V3, 3).
-define(MQTT_PROTO_V4, 4).
-define(MQTT_PROTO_V5, 5).
-define(PROTOCOL_NAMES, [
{?MQTT_PROTO_V3, <<"MQIsdp">>},
{?MQTT_PROTO_V4, <<"MQTT">>},
{?MQTT_PROTO_V5, <<"MQTT">>}]).
%%--------------------------------------------------------------------
%% MQTT QoS Levels
%%--------------------------------------------------------------------
-define(QOS_0, 0). %% At most once
-define(QOS_1, 1). %% At least once
-define(QOS_2, 2). %% Exactly once
-define(IS_QOS(I), (I >= ?QOS_0 andalso I =< ?QOS_2)).
-define(QOS_I(Name),
begin
(case Name of
?QOS_0 -> ?QOS_0;
qos0 -> ?QOS_0;
at_most_once -> ?QOS_0;
?QOS_1 -> ?QOS_1;
qos1 -> ?QOS_1;
at_least_once -> ?QOS_1;
?QOS_2 -> ?QOS_2;
qos2 -> ?QOS_2;
exactly_once -> ?QOS_2
end)
end).
-define(IS_QOS_NAME(I),
(I =:= qos0 orelse I =:= at_most_once orelse
I =:= qos1 orelse I =:= at_least_once orelse
I =:= qos2 orelse I =:= exactly_once)).
%%--------------------------------------------------------------------
%% Maximum ClientId Length.
%%--------------------------------------------------------------------
-define(MAX_CLIENTID_LEN, 65535).
%%--------------------------------------------------------------------
%% MQTT Control Packet Types
%%--------------------------------------------------------------------
-define(RESERVED, 0). %% Reserved
-define(CONNECT, 1). %% Client request to connect to Server
-define(CONNACK, 2). %% Server to Client: Connect acknowledgment
-define(PUBLISH, 3). %% Publish message
-define(PUBACK, 4). %% Publish acknowledgment
-define(PUBREC, 5). %% Publish received (assured delivery part 1)
-define(PUBREL, 6). %% Publish release (assured delivery part 2)
-define(PUBCOMP, 7). %% Publish complete (assured delivery part 3)
-define(SUBSCRIBE, 8). %% Client subscribe request
-define(SUBACK, 9). %% Server Subscribe acknowledgment
-define(UNSUBSCRIBE, 10). %% Unsubscribe request
-define(UNSUBACK, 11). %% Unsubscribe acknowledgment
-define(PINGREQ, 12). %% PING request
-define(PINGRESP, 13). %% PING response
-define(DISCONNECT, 14). %% Client or Server is disconnecting
-define(AUTH, 15). %% Authentication exchange
-define(TYPE_NAMES, [
'CONNECT',
'CONNACK',
'PUBLISH',
'PUBACK',
'PUBREC',
'PUBREL',
'PUBCOMP',
'SUBSCRIBE',
'SUBACK',
'UNSUBSCRIBE',
'UNSUBACK',
'PINGREQ',
'PINGRESP',
'DISCONNECT',
'AUTH']).
%%--------------------------------------------------------------------
%% MQTT V3.1.1 Connect Return Codes
%%--------------------------------------------------------------------
-define(CONNACK_ACCEPT, 0). %% Connection accepted
-define(CONNACK_PROTO_VER, 1). %% Unacceptable protocol version
-define(CONNACK_INVALID_ID, 2). %% Client Identifier is correct UTF-8 but not allowed by the Server
-define(CONNACK_SERVER, 3). %% Server unavailable
-define(CONNACK_CREDENTIALS, 4). %% Username or password is malformed
-define(CONNACK_AUTH, 5). %% Client is not authorized to connect
%%--------------------------------------------------------------------
%% MQTT V5.0 Reason Codes
%%--------------------------------------------------------------------
-define(RC_SUCCESS, 16#00).
-define(RC_NORMAL_DISCONNECTION, 16#00).
-define(RC_GRANTED_QOS_0, 16#00).
-define(RC_GRANTED_QOS_1, 16#01).
-define(RC_GRANTED_QOS_2, 16#02).
-define(RC_DISCONNECT_WITH_WILL_MESSAGE, 16#04).
-define(RC_NO_MATCHING_SUBSCRIBERS, 16#10).
-define(RC_NO_SUBSCRIPTION_EXISTED, 16#11).
-define(RC_CONTINUE_AUTHENTICATION, 16#18).
-define(RC_RE_AUTHENTICATE, 16#19).
-define(RC_UNSPECIFIED_ERROR, 16#80).
-define(RC_MALFORMED_PACKET, 16#81).
-define(RC_PROTOCOL_ERROR, 16#82).
-define(RC_IMPLEMENTATION_SPECIFIC_ERROR, 16#83).
-define(RC_UNSUPPORTED_PROTOCOL_VERSION, 16#84).
-define(RC_CLIENT_IDENTIFIER_NOT_VALID, 16#85).
-define(RC_BAD_USER_NAME_OR_PASSWORD, 16#86).
-define(RC_NOT_AUTHORIZED, 16#87).
-define(RC_SERVER_UNAVAILABLE, 16#88).
-define(RC_SERVER_BUSY, 16#89).
-define(RC_BANNED, 16#8A).
-define(RC_SERVER_SHUTTING_DOWN, 16#8B).
-define(RC_BAD_AUTHENTICATION_METHOD, 16#8C).
-define(RC_KEEP_ALIVE_TIMEOUT, 16#8D).
-define(RC_SESSION_TAKEN_OVER, 16#8E).
-define(RC_TOPIC_FILTER_INVALID, 16#8F).
-define(RC_TOPIC_NAME_INVALID, 16#90).
-define(RC_PACKET_IDENTIFIER_IN_USE, 16#91).
-define(RC_PACKET_IDENTIFIER_NOT_FOUND, 16#92).
-define(RC_RECEIVE_MAXIMUM_EXCEEDED, 16#93).
-define(RC_TOPIC_ALIAS_INVALID, 16#94).
-define(RC_PACKET_TOO_LARGE, 16#95).
-define(RC_MESSAGE_RATE_TOO_HIGH, 16#96).
-define(RC_QUOTA_EXCEEDED, 16#97).
-define(RC_ADMINISTRATIVE_ACTION, 16#98).
-define(RC_PAYLOAD_FORMAT_INVALID, 16#99).
-define(RC_RETAIN_NOT_SUPPORTED, 16#9A).
-define(RC_QOS_NOT_SUPPORTED, 16#9B).
-define(RC_USE_ANOTHER_SERVER, 16#9C).
-define(RC_SERVER_MOVED, 16#9D).
-define(RC_SHARED_SUBSCRIPTIONS_NOT_SUPPORTED, 16#9E).
-define(RC_CONNECTION_RATE_EXCEEDED, 16#9F).
-define(RC_MAXIMUM_CONNECT_TIME, 16#A0).
-define(RC_SUBSCRIPTION_IDENTIFIERS_NOT_SUPPORTED, 16#A1).
-define(RC_WILDCARD_SUBSCRIPTIONS_NOT_SUPPORTED, 16#A2).
%%--------------------------------------------------------------------
%% Maximum MQTT Packet ID and Length
%%--------------------------------------------------------------------
-define(MAX_PACKET_ID, 16#ffff).
-define(MAX_PACKET_SIZE, 16#fffffff).
%%--------------------------------------------------------------------
%% MQTT Frame Mask
%%--------------------------------------------------------------------
-define(HIGHBIT, 2#10000000).
-define(LOWBITS, 2#01111111).
%%--------------------------------------------------------------------
%% MQTT Packet Fixed Header
%%--------------------------------------------------------------------
-record(mqtt_packet_header, {
type = ?RESERVED,
dup = false,
qos = ?QOS_0,
retain = false
}).
%%--------------------------------------------------------------------
%% MQTT Packets
%%--------------------------------------------------------------------
-define(DEFAULT_SUBOPTS, #{rh => 0, %% Retain Handling
rap => 0, %% Retain as Publish
nl => 0, %% No Local
qos => 0 %% QoS
}).
-record(mqtt_packet_connect, {
proto_name = <<"MQTT">>,
proto_ver = ?MQTT_PROTO_V4,
is_bridge = false,
clean_start = true,
will_flag = false,
will_qos = ?QOS_0,
will_retain = false,
keepalive = 0,
properties = undefined,
clientid = <<>>,
will_props = undefined,
will_topic = undefined,
will_payload = undefined,
username = undefined,
password = undefined
}).
-record(mqtt_packet_connack, {
ack_flags,
reason_code,
properties
}).
-record(mqtt_packet_publish, {
topic_name,
packet_id,
properties
}).
-record(mqtt_packet_puback, {
packet_id,
reason_code,
properties
}).
-record(mqtt_packet_subscribe, {
packet_id,
properties,
topic_filters
}).
-record(mqtt_packet_suback, {
packet_id,
properties,
reason_codes
}).
-record(mqtt_packet_unsubscribe, {
packet_id,
properties,
topic_filters
}).
-record(mqtt_packet_unsuback, {
packet_id,
properties,
reason_codes
}).
-record(mqtt_packet_disconnect, {
reason_code,
properties
}).
-record(mqtt_packet_auth, {
reason_code,
properties
}).
%%--------------------------------------------------------------------
%% MQTT Message
%%--------------------------------------------------------------------
-record(mqtt_msg, {
qos = ?QOS_0 :: emqtt:qos(),
retain = false :: boolean(),
dup = false :: boolean(),
packet_id :: emqtt:packet_id(),
topic :: emqtt:topic(),
props :: emqtt:properties(),
payload :: binary()
}).
%%--------------------------------------------------------------------
%% MQTT Control Packet
%%--------------------------------------------------------------------
-record(mqtt_packet, {
header :: #mqtt_packet_header{},
variable :: #mqtt_packet_connect{}
| #mqtt_packet_connack{}
| #mqtt_packet_publish{}
| #mqtt_packet_puback{}
| #mqtt_packet_subscribe{}
| #mqtt_packet_suback{}
| #mqtt_packet_unsubscribe{}
| #mqtt_packet_unsuback{}
| #mqtt_packet_disconnect{}
| #mqtt_packet_auth{}
| pos_integer()
| undefined,
payload :: binary() | undefined
}).
%%--------------------------------------------------------------------
%% MQTT Packet Match
%%--------------------------------------------------------------------
-define(CONNECT_PACKET(Var),
#mqtt_packet{header = #mqtt_packet_header{type = ?CONNECT},
variable = Var}).
-define(CONNACK_PACKET(ReasonCode),
#mqtt_packet{header = #mqtt_packet_header{type = ?CONNACK},
variable = #mqtt_packet_connack{ack_flags = 0,
reason_code = ReasonCode}
}).
-define(CONNACK_PACKET(ReasonCode, SessPresent),
#mqtt_packet{header = #mqtt_packet_header{type = ?CONNACK},
variable = #mqtt_packet_connack{ack_flags = SessPresent,
reason_code = ReasonCode}
}).
-define(CONNACK_PACKET(ReasonCode, SessPresent, Properties),
#mqtt_packet{header = #mqtt_packet_header{type = ?CONNACK},
variable = #mqtt_packet_connack{ack_flags = SessPresent,
reason_code = ReasonCode,
properties = Properties}
}).
-define(AUTH_PACKET(),
#mqtt_packet{header = #mqtt_packet_header{type = ?AUTH},
variable = #mqtt_packet_auth{reason_code = 0}
}).
-define(AUTH_PACKET(ReasonCode),
#mqtt_packet{header = #mqtt_packet_header{type = ?AUTH},
variable = #mqtt_packet_auth{reason_code = ReasonCode}
}).
-define(AUTH_PACKET(ReasonCode, Properties),
#mqtt_packet{header = #mqtt_packet_header{type = ?AUTH},
variable = #mqtt_packet_auth{reason_code = ReasonCode,
properties = Properties}
}).
-define(PUBLISH_PACKET(QoS),
#mqtt_packet{header = #mqtt_packet_header{type = ?PUBLISH, qos = QoS}}).
-define(PUBLISH_PACKET(QoS, PacketId),
#mqtt_packet{header = #mqtt_packet_header{type = ?PUBLISH,
qos = QoS},
variable = #mqtt_packet_publish{packet_id = PacketId}
}).
-define(PUBLISH_PACKET(QoS, Topic, PacketId, Payload),
#mqtt_packet{header = #mqtt_packet_header{type = ?PUBLISH,
qos = QoS},
variable = #mqtt_packet_publish{topic_name = Topic,
packet_id = PacketId},
payload = Payload
}).
-define(PUBLISH_PACKET(QoS, Topic, PacketId, Properties, Payload),
#mqtt_packet{header = #mqtt_packet_header{type = ?PUBLISH,
qos = QoS},
variable = #mqtt_packet_publish{topic_name = Topic,
packet_id = PacketId,
properties = Properties},
payload = Payload
}).
-define(PUBACK_PACKET(PacketId),
#mqtt_packet{header = #mqtt_packet_header{type = ?PUBACK},
variable = #mqtt_packet_puback{packet_id = PacketId,
reason_code = 0}
}).
-define(PUBACK_PACKET(PacketId, ReasonCode),
#mqtt_packet{header = #mqtt_packet_header{type = ?PUBACK},
variable = #mqtt_packet_puback{packet_id = PacketId,
reason_code = ReasonCode}
}).
-define(PUBACK_PACKET(PacketId, ReasonCode, Properties),
#mqtt_packet{header = #mqtt_packet_header{type = ?PUBACK},
variable = #mqtt_packet_puback{packet_id = PacketId,
reason_code = ReasonCode,
properties = Properties}
}).
-define(PUBREC_PACKET(PacketId),
#mqtt_packet{header = #mqtt_packet_header{type = ?PUBREC},
variable = #mqtt_packet_puback{packet_id = PacketId,
reason_code = 0}
}).
-define(PUBREC_PACKET(PacketId, ReasonCode),
#mqtt_packet{header = #mqtt_packet_header{type = ?PUBREC},
variable = #mqtt_packet_puback{packet_id = PacketId,
reason_code = ReasonCode}
}).
-define(PUBREC_PACKET(PacketId, ReasonCode, Properties),
#mqtt_packet{header = #mqtt_packet_header{type = ?PUBREC},
variable = #mqtt_packet_puback{packet_id = PacketId,
reason_code = ReasonCode,
properties = Properties}
}).
-define(PUBREL_PACKET(PacketId),
#mqtt_packet{header = #mqtt_packet_header{type = ?PUBREL,
qos = ?QOS_1},
variable = #mqtt_packet_puback{packet_id = PacketId,
reason_code = 0}
}).
-define(PUBREL_PACKET(PacketId, ReasonCode),
#mqtt_packet{header = #mqtt_packet_header{type = ?PUBREL,
qos = ?QOS_1},
variable = #mqtt_packet_puback{packet_id = PacketId,
reason_code = ReasonCode}
}).
-define(PUBREL_PACKET(PacketId, ReasonCode, Properties),
#mqtt_packet{header = #mqtt_packet_header{type = ?PUBREL,
qos = ?QOS_1},
variable = #mqtt_packet_puback{packet_id = PacketId,
reason_code = ReasonCode,
properties = Properties}
}).
-define(PUBCOMP_PACKET(PacketId),
#mqtt_packet{header = #mqtt_packet_header{type = ?PUBCOMP},
variable = #mqtt_packet_puback{packet_id = PacketId,
reason_code = 0}
}).
-define(PUBCOMP_PACKET(PacketId, ReasonCode),
#mqtt_packet{header = #mqtt_packet_header{type = ?PUBCOMP},
variable = #mqtt_packet_puback{packet_id = PacketId,
reason_code = ReasonCode}
}).
-define(PUBCOMP_PACKET(PacketId, ReasonCode, Properties),
#mqtt_packet{header = #mqtt_packet_header{type = ?PUBCOMP},
variable = #mqtt_packet_puback{packet_id = PacketId,
reason_code = ReasonCode,
properties = Properties}
}).
-define(SUBSCRIBE_PACKET(PacketId, TopicFilters),
#mqtt_packet{header = #mqtt_packet_header{type = ?SUBSCRIBE,
qos = ?QOS_1},
variable = #mqtt_packet_subscribe{packet_id = PacketId,
topic_filters = TopicFilters}
}).
-define(SUBSCRIBE_PACKET(PacketId, Properties, TopicFilters),
#mqtt_packet{header = #mqtt_packet_header{type = ?SUBSCRIBE,
qos = ?QOS_1},
variable = #mqtt_packet_subscribe{packet_id = PacketId,
properties = Properties,
topic_filters = TopicFilters}
}).
-define(SUBACK_PACKET(PacketId, ReasonCodes),
#mqtt_packet{header = #mqtt_packet_header{type = ?SUBACK},
variable = #mqtt_packet_suback{packet_id = PacketId,
reason_codes = ReasonCodes}
}).
-define(SUBACK_PACKET(PacketId, Properties, ReasonCodes),
#mqtt_packet{header = #mqtt_packet_header{type = ?SUBACK},
variable = #mqtt_packet_suback{packet_id = PacketId,
properties = Properties,
reason_codes = ReasonCodes}
}).
-define(UNSUBSCRIBE_PACKET(PacketId, TopicFilters),
#mqtt_packet{header = #mqtt_packet_header{type = ?UNSUBSCRIBE,
qos = ?QOS_1},
variable = #mqtt_packet_unsubscribe{packet_id = PacketId,
topic_filters = TopicFilters}
}).
-define(UNSUBSCRIBE_PACKET(PacketId, Properties, TopicFilters),
#mqtt_packet{header = #mqtt_packet_header{type = ?UNSUBSCRIBE,
qos = ?QOS_1},
variable = #mqtt_packet_unsubscribe{packet_id = PacketId,
properties = Properties,
topic_filters = TopicFilters}
}).
-define(UNSUBACK_PACKET(PacketId),
#mqtt_packet{header = #mqtt_packet_header{type = ?UNSUBACK},
variable = #mqtt_packet_unsuback{packet_id = PacketId}
}).
-define(UNSUBACK_PACKET(PacketId, ReasonCodes),
#mqtt_packet{header = #mqtt_packet_header{type = ?UNSUBACK},
variable = #mqtt_packet_unsuback{packet_id = PacketId,
reason_codes = ReasonCodes}
}).
-define(UNSUBACK_PACKET(PacketId, Properties, ReasonCodes),
#mqtt_packet{header = #mqtt_packet_header{type = ?UNSUBACK},
variable = #mqtt_packet_unsuback{packet_id = PacketId,
properties = Properties,
reason_codes = ReasonCodes}
}).
-define(DISCONNECT_PACKET(),
#mqtt_packet{header = #mqtt_packet_header{type = ?DISCONNECT},
variable = #mqtt_packet_disconnect{reason_code = 0}
}).
-define(DISCONNECT_PACKET(ReasonCode),
#mqtt_packet{header = #mqtt_packet_header{type = ?DISCONNECT},
variable = #mqtt_packet_disconnect{reason_code = ReasonCode}
}).
-define(DISCONNECT_PACKET(ReasonCode, Properties),
#mqtt_packet{header = #mqtt_packet_header{type = ?DISCONNECT},
variable = #mqtt_packet_disconnect{reason_code = ReasonCode,
properties = Properties}
}).
-define(PACKET(Type), #mqtt_packet{header = #mqtt_packet_header{type = Type}}).
-endif.

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{erl_opts, [debug_info]}.
{deps, []}.

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[].

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{application, emqtt,
[{description, "An OTP library"},
{vsn, "0.1.0"},
{registered, []},
{applications,
[kernel,
stdlib
]},
{env,[]},
{modules, []},
{licenses, ["Apache-2.0"]},
{links, []}
]}.

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%%--------------------------------------------------------------------
%% Copyright (c) 2020 EMQ Technologies Co., Ltd. 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(emqtt_frame).
-include("emqtt.hrl").
-export([initial_parse_state/0, initial_parse_state/1]).
-export([parse/1, parse/2, serialize_fun/0, serialize_fun/1, serialize/1, serialize/2 ]).
-export_type([options/0, parse_state/0, parse_result/0, serialize_fun/0]).
-type(version() :: ?MQTT_PROTO_V3
| ?MQTT_PROTO_V4
| ?MQTT_PROTO_V5).
-type(options() :: #{strict_mode => boolean(),
max_size => 1..?MAX_PACKET_SIZE,
version => version()}).
-opaque(parse_state() :: {none, options()} | cont_fun()).
-opaque(parse_result() :: {more, cont_fun()}
| {ok, #mqtt_packet{}, binary(), parse_state()}).
-type(cont_fun() :: fun((binary()) -> parse_result())).
-type(serialize_fun() :: fun((emqx_types:packet()) -> iodata())).
-define(none(Options), {none, Options}).
-define(DEFAULT_OPTIONS,
#{strict_mode => false,
max_size => ?MAX_PACKET_SIZE,
version => ?MQTT_PROTO_V4
}).
%%--------------------------------------------------------------------
%% Init Parse State
%%--------------------------------------------------------------------
-spec(initial_parse_state() -> {none, options()}).
initial_parse_state() ->
initial_parse_state(#{}).
-spec(initial_parse_state(options()) -> {none, options()}).
initial_parse_state(Options) when is_map(Options) ->
?none(merge_opts(Options)).
%% @pivate
merge_opts(Options) ->
maps:merge(?DEFAULT_OPTIONS, Options).
%%--------------------------------------------------------------------
%% Parse MQTT Frame
%%--------------------------------------------------------------------
-spec(parse(binary()) -> parse_result()).
parse(Bin) ->
parse(Bin, initial_parse_state()).
-spec(parse(binary(), parse_state()) -> parse_result()).
parse(<<>>, {none, Options}) ->
{more, fun(Bin) -> parse(Bin, {none, Options}) end};
parse(<<Type:4, Dup:1, QoS:2, Retain:1, Rest/binary>>,
{none, Options = #{strict_mode := StrictMode}}) ->
%% Validate header if strict mode.
StrictMode andalso validate_header(Type, Dup, QoS, Retain),
Header = #mqtt_packet_header{type = Type,
dup = bool(Dup),
qos = QoS,
retain = bool(Retain)
},
Header1 = case fixqos(Type, QoS) of
QoS -> Header;
FixedQoS -> Header#mqtt_packet_header{qos = FixedQoS}
end,
parse_remaining_len(Rest, Header1, Options);
parse(Bin, Cont) when is_binary(Bin), is_function(Cont) ->
Cont(Bin).
parse_remaining_len(<<>>, Header, Options) ->
{more, fun(Bin) -> parse_remaining_len(Bin, Header, Options) end};
parse_remaining_len(Rest, Header, Options) ->
parse_remaining_len(Rest, Header, 1, 0, Options).
parse_remaining_len(_Bin, _Header, _Multiplier, Length, #{max_size := MaxSize}) when Length > MaxSize ->
error(frame_too_large);
parse_remaining_len(<<>>, Header, Multiplier, Length, Options) ->
{more, fun(Bin) -> parse_remaining_len(Bin, Header, Multiplier, Length, Options) end};
%% Match DISCONNECT without payload
parse_remaining_len(<<0:8, Rest/binary>>, Header = #mqtt_packet_header{type = ?DISCONNECT}, 1, 0, Options) ->
Packet = packet(Header, #mqtt_packet_disconnect{reason_code = ?RC_SUCCESS}),
{ok, Packet, Rest, ?none(Options)};
%% Match PINGREQ.
parse_remaining_len(<<0:8, Rest/binary>>, Header, 1, 0, Options) ->
parse_frame(Rest, Header, 0, Options);
%% Match PUBACK, PUBREC, PUBREL, PUBCOMP, UNSUBACK...
parse_remaining_len(<<0:1, 2:7, Rest/binary>>, Header, 1, 0, Options) ->
parse_frame(Rest, Header, 2, Options);
parse_remaining_len(<<1:1, Len:7, Rest/binary>>, Header, Multiplier, Value, Options) ->
parse_remaining_len(Rest, Header, Multiplier * ?HIGHBIT, Value + Len * Multiplier, Options);
parse_remaining_len(<<0:1, Len:7, Rest/binary>>, Header, Multiplier, Value,
Options = #{max_size := MaxSize}) ->
FrameLen = Value + Len * Multiplier,
if
FrameLen > MaxSize ->
error(frame_too_large);
true ->
parse_frame(Rest, Header, FrameLen, Options)
end.
parse_frame(Bin, Header, 0, Options) ->
{ok, packet(Header), Bin, ?none(Options)};
parse_frame(Bin, Header, Length, Options) ->
case Bin of
<<FrameBin:Length/binary, Rest/binary>> ->
case parse_packet(Header, FrameBin, Options) of
{Variable, Payload} ->
{ok, packet(Header, Variable, Payload), Rest, ?none(Options)};
Variable = #mqtt_packet_connect{proto_ver = Ver} ->
{ok, packet(Header, Variable), Rest, ?none(Options#{version := Ver})};
Variable ->
{ok, packet(Header, Variable), Rest, ?none(Options)}
end;
TooShortBin ->
{more, fun(BinMore) ->
parse_frame(<<TooShortBin/binary, BinMore/binary>>, Header, Length, Options)
end}
end.
-compile({inline, [packet/1, packet/2, packet/3]}).
packet(Header) ->
#mqtt_packet{header = Header}.
packet(Header, Variable) ->
#mqtt_packet{header = Header, variable = Variable}.
packet(Header, Variable, Payload) ->
#mqtt_packet{header = Header, variable = Variable, payload = Payload}.
parse_packet(#mqtt_packet_header{type = ?CONNECT}, FrameBin, _Options) ->
{ProtoName, Rest} = parse_utf8_string(FrameBin),
<<BridgeTag:4, ProtoVer:4, Rest1/binary>> = Rest,
% Note: Crash when reserved flag doesn't equal to 0, there is no strict
% compliance with the MQTT5.0.
<<UsernameFlag : 1,
PasswordFlag : 1,
WillRetain : 1,
WillQoS : 2,
WillFlag : 1,
CleanStart : 1,
0 : 1,
KeepAlive : 16/big,
Rest2/binary>> = Rest1,
{Properties, Rest3} = parse_properties(Rest2, ProtoVer),
{ClientId, Rest4} = parse_utf8_string(Rest3),
ConnPacket = #mqtt_packet_connect{proto_name = ProtoName,
proto_ver = ProtoVer,
is_bridge = (BridgeTag =:= 8),
clean_start = bool(CleanStart),
will_flag = bool(WillFlag),
will_qos = WillQoS,
will_retain = bool(WillRetain),
keepalive = KeepAlive,
properties = Properties,
clientid = ClientId
},
{ConnPacket1, Rest5} = parse_will_message(ConnPacket, Rest4),
{Username, Rest6} = parse_utf8_string(Rest5, bool(UsernameFlag)),
{Passsword, <<>>} = parse_utf8_string(Rest6, bool(PasswordFlag)),
ConnPacket1#mqtt_packet_connect{username = Username, password = Passsword};
parse_packet(#mqtt_packet_header{type = ?CONNACK},
<<AckFlags:8, ReasonCode:8, Rest/binary>>, #{version := Ver}) ->
{Properties, <<>>} = parse_properties(Rest, Ver),
#mqtt_packet_connack{ack_flags = AckFlags,
reason_code = ReasonCode,
properties = Properties
};
parse_packet(#mqtt_packet_header{type = ?PUBLISH, qos = QoS}, Bin,
#{strict_mode := StrictMode, version := Ver}) ->
{TopicName, Rest} = parse_utf8_string(Bin),
{PacketId, Rest1} = case QoS of
?QOS_0 -> {undefined, Rest};
_ -> parse_packet_id(Rest)
end,
(PacketId =/= undefined) andalso
StrictMode andalso validate_packet_id(PacketId),
{Properties, Payload} = parse_properties(Rest1, Ver),
Publish = #mqtt_packet_publish{topic_name = TopicName,
packet_id = PacketId,
properties = Properties
},
{Publish, Payload};
parse_packet(#mqtt_packet_header{type = PubAck}, <<PacketId:16/big>>, #{strict_mode := StrictMode})
when ?PUBACK =< PubAck, PubAck =< ?PUBCOMP ->
StrictMode andalso validate_packet_id(PacketId),
#mqtt_packet_puback{packet_id = PacketId, reason_code = 0};
parse_packet(#mqtt_packet_header{type = PubAck}, <<PacketId:16/big, ReasonCode, Rest/binary>>,
#{strict_mode := StrictMode, version := Ver = ?MQTT_PROTO_V5})
when ?PUBACK =< PubAck, PubAck =< ?PUBCOMP ->
StrictMode andalso validate_packet_id(PacketId),
{Properties, <<>>} = parse_properties(Rest, Ver),
#mqtt_packet_puback{packet_id = PacketId,
reason_code = ReasonCode,
properties = Properties
};
parse_packet(#mqtt_packet_header{type = ?SUBSCRIBE}, <<PacketId:16/big, Rest/binary>>,
#{strict_mode := StrictMode, version := Ver}) ->
StrictMode andalso validate_packet_id(PacketId),
{Properties, Rest1} = parse_properties(Rest, Ver),
TopicFilters = parse_topic_filters(subscribe, Rest1),
ok = validate_subqos([QoS || {_, #{qos := QoS}} <- TopicFilters]),
#mqtt_packet_subscribe{packet_id = PacketId,
properties = Properties,
topic_filters = TopicFilters
};
parse_packet(#mqtt_packet_header{type = ?SUBACK}, <<PacketId:16/big, Rest/binary>>,
#{strict_mode := StrictMode, version := Ver}) ->
StrictMode andalso validate_packet_id(PacketId),
{Properties, Rest1} = parse_properties(Rest, Ver),
ReasonCodes = parse_reason_codes(Rest1),
#mqtt_packet_suback{packet_id = PacketId,
properties = Properties,
reason_codes = ReasonCodes
};
parse_packet(#mqtt_packet_header{type = ?UNSUBSCRIBE}, <<PacketId:16/big, Rest/binary>>,
#{strict_mode := StrictMode, version := Ver}) ->
StrictMode andalso validate_packet_id(PacketId),
{Properties, Rest1} = parse_properties(Rest, Ver),
TopicFilters = parse_topic_filters(unsubscribe, Rest1),
#mqtt_packet_unsubscribe{packet_id = PacketId,
properties = Properties,
topic_filters = TopicFilters
};
parse_packet(#mqtt_packet_header{type = ?UNSUBACK}, <<PacketId:16/big>>,
#{strict_mode := StrictMode}) ->
StrictMode andalso validate_packet_id(PacketId),
#mqtt_packet_unsuback{packet_id = PacketId};
parse_packet(#mqtt_packet_header{type = ?UNSUBACK}, <<PacketId:16/big, Rest/binary>>,
#{strict_mode := StrictMode, version := Ver}) ->
StrictMode andalso validate_packet_id(PacketId),
{Properties, Rest1} = parse_properties(Rest, Ver),
ReasonCodes = parse_reason_codes(Rest1),
#mqtt_packet_unsuback{packet_id = PacketId,
properties = Properties,
reason_codes = ReasonCodes
};
parse_packet(#mqtt_packet_header{type = ?DISCONNECT}, <<ReasonCode, Rest/binary>>,
#{version := ?MQTT_PROTO_V5}) ->
{Properties, <<>>} = parse_properties(Rest, ?MQTT_PROTO_V5),
#mqtt_packet_disconnect{reason_code = ReasonCode,
properties = Properties
};
parse_packet(#mqtt_packet_header{type = ?AUTH}, <<ReasonCode, Rest/binary>>,
#{version := ?MQTT_PROTO_V5}) ->
{Properties, <<>>} = parse_properties(Rest, ?MQTT_PROTO_V5),
#mqtt_packet_auth{reason_code = ReasonCode, properties = Properties}.
parse_will_message(Packet = #mqtt_packet_connect{will_flag = true,
proto_ver = Ver}, Bin) ->
{Props, Rest} = parse_properties(Bin, Ver),
{Topic, Rest1} = parse_utf8_string(Rest),
{Payload, Rest2} = parse_binary_data(Rest1),
{Packet#mqtt_packet_connect{will_props = Props,
will_topic = Topic,
will_payload = Payload
}, Rest2};
parse_will_message(Packet, Bin) -> {Packet, Bin}.
-compile({inline, [parse_packet_id/1]}).
parse_packet_id(<<PacketId:16/big, Rest/binary>>) ->
{PacketId, Rest}.
parse_properties(Bin, Ver) when Ver =/= ?MQTT_PROTO_V5 ->
{undefined, Bin};
%% TODO: version mess?
parse_properties(<<>>, ?MQTT_PROTO_V5) ->
{#{}, <<>>};
parse_properties(<<0, Rest/binary>>, ?MQTT_PROTO_V5) ->
{#{}, Rest};
parse_properties(Bin, ?MQTT_PROTO_V5) ->
{Len, Rest} = parse_variable_byte_integer(Bin),
<<PropsBin:Len/binary, Rest1/binary>> = Rest,
{parse_property(PropsBin, #{}), Rest1}.
parse_property(<<>>, Props) ->
Props;
parse_property(<<16#01, Val, Bin/binary>>, Props) ->
parse_property(Bin, Props#{'Payload-Format-Indicator' => Val});
parse_property(<<16#02, Val:32/big, Bin/binary>>, Props) ->
parse_property(Bin, Props#{'Message-Expiry-Interval' => Val});
parse_property(<<16#03, Bin/binary>>, Props) ->
{Val, Rest} = parse_utf8_string(Bin),
parse_property(Rest, Props#{'Content-Type' => Val});
parse_property(<<16#08, Bin/binary>>, Props) ->
{Val, Rest} = parse_utf8_string(Bin),
parse_property(Rest, Props#{'Response-Topic' => Val});
parse_property(<<16#09, Len:16/big, Val:Len/binary, Bin/binary>>, Props) ->
parse_property(Bin, Props#{'Correlation-Data' => Val});
parse_property(<<16#0B, Bin/binary>>, Props) ->
{Val, Rest} = parse_variable_byte_integer(Bin),
parse_property(Rest, Props#{'Subscription-Identifier' => Val});
parse_property(<<16#11, Val:32/big, Bin/binary>>, Props) ->
parse_property(Bin, Props#{'Session-Expiry-Interval' => Val});
parse_property(<<16#12, Bin/binary>>, Props) ->
{Val, Rest} = parse_utf8_string(Bin),
parse_property(Rest, Props#{'Assigned-Client-Identifier' => Val});
parse_property(<<16#13, Val:16, Bin/binary>>, Props) ->
parse_property(Bin, Props#{'Server-Keep-Alive' => Val});
parse_property(<<16#15, Bin/binary>>, Props) ->
{Val, Rest} = parse_utf8_string(Bin),
parse_property(Rest, Props#{'Authentication-Method' => Val});
parse_property(<<16#16, Len:16/big, Val:Len/binary, Bin/binary>>, Props) ->
parse_property(Bin, Props#{'Authentication-Data' => Val});
parse_property(<<16#17, Val, Bin/binary>>, Props) ->
parse_property(Bin, Props#{'Request-Problem-Information' => Val});
parse_property(<<16#18, Val:32, Bin/binary>>, Props) ->
parse_property(Bin, Props#{'Will-Delay-Interval' => Val});
parse_property(<<16#19, Val, Bin/binary>>, Props) ->
parse_property(Bin, Props#{'Request-Response-Information' => Val});
parse_property(<<16#1A, Bin/binary>>, Props) ->
{Val, Rest} = parse_utf8_string(Bin),
parse_property(Rest, Props#{'Response-Information' => Val});
parse_property(<<16#1C, Bin/binary>>, Props) ->
{Val, Rest} = parse_utf8_string(Bin),
parse_property(Rest, Props#{'Server-Reference' => Val});
parse_property(<<16#1F, Bin/binary>>, Props) ->
{Val, Rest} = parse_utf8_string(Bin),
parse_property(Rest, Props#{'Reason-String' => Val});
parse_property(<<16#21, Val:16/big, Bin/binary>>, Props) ->
parse_property(Bin, Props#{'Receive-Maximum' => Val});
parse_property(<<16#22, Val:16/big, Bin/binary>>, Props) ->
parse_property(Bin, Props#{'Topic-Alias-Maximum' => Val});
parse_property(<<16#23, Val:16/big, Bin/binary>>, Props) ->
parse_property(Bin, Props#{'Topic-Alias' => Val});
parse_property(<<16#24, Val, Bin/binary>>, Props) ->
parse_property(Bin, Props#{'Maximum-QoS' => Val});
parse_property(<<16#25, Val, Bin/binary>>, Props) ->
parse_property(Bin, Props#{'Retain-Available' => Val});
parse_property(<<16#26, Bin/binary>>, Props) ->
{Pair, Rest} = parse_utf8_pair(Bin),
case maps:find('User-Property', Props) of
{ok, UserProps} ->
UserProps1 = lists:append(UserProps, [Pair]),
parse_property(Rest, Props#{'User-Property' := UserProps1});
error ->
parse_property(Rest, Props#{'User-Property' => [Pair]})
end;
parse_property(<<16#27, Val:32, Bin/binary>>, Props) ->
parse_property(Bin, Props#{'Maximum-Packet-Size' => Val});
parse_property(<<16#28, Val, Bin/binary>>, Props) ->
parse_property(Bin, Props#{'Wildcard-Subscription-Available' => Val});
parse_property(<<16#29, Val, Bin/binary>>, Props) ->
parse_property(Bin, Props#{'Subscription-Identifier-Available' => Val});
parse_property(<<16#2A, Val, Bin/binary>>, Props) ->
parse_property(Bin, Props#{'Shared-Subscription-Available' => Val}).
parse_variable_byte_integer(Bin) ->
parse_variable_byte_integer(Bin, 1, 0).
parse_variable_byte_integer(<<1:1, Len:7, Rest/binary>>, Multiplier, Value) ->
parse_variable_byte_integer(Rest, Multiplier * ?HIGHBIT, Value + Len * Multiplier);
parse_variable_byte_integer(<<0:1, Len:7, Rest/binary>>, Multiplier, Value) ->
{Value + Len * Multiplier, Rest}.
parse_topic_filters(subscribe, Bin) ->
[{Topic, #{rh => Rh, rap => Rap, nl => Nl, qos => QoS}}
|| <<Len:16/big, Topic:Len/binary, _:2, Rh:2, Rap:1, Nl:1, QoS:2>> <= Bin];
parse_topic_filters(unsubscribe, Bin) ->
[Topic || <<Len:16/big, Topic:Len/binary>> <= Bin].
parse_reason_codes(Bin) ->
[Code || <<Code>> <= Bin].
parse_utf8_pair(<<Len1:16/big, Key:Len1/binary,
Len2:16/big, Val:Len2/binary, Rest/binary>>) ->
{{Key, Val}, Rest}.
parse_utf8_string(Bin, false) ->
{undefined, Bin};
parse_utf8_string(Bin, true) ->
parse_utf8_string(Bin).
parse_utf8_string(<<Len:16/big, Str:Len/binary, Rest/binary>>) ->
{Str, Rest}.
parse_binary_data(<<Len:16/big, Data:Len/binary, Rest/binary>>) ->
{Data, Rest}.
%%--------------------------------------------------------------------
%% Serialize MQTT Packet
%%--------------------------------------------------------------------
serialize_fun() -> serialize_fun(?DEFAULT_OPTIONS).
serialize_fun(#mqtt_packet_connect{proto_ver = ProtoVer, properties = ConnProps}) ->
MaxSize = get_property('Maximum-Packet-Size', ConnProps, ?MAX_PACKET_SIZE),
serialize_fun(#{version => ProtoVer, max_size => MaxSize});
serialize_fun(#{version := Ver, max_size := MaxSize}) ->
fun(Packet) ->
IoData = serialize(Packet, Ver),
case is_too_large(IoData, MaxSize) of
true -> <<>>;
false -> IoData
end
end.
-spec(serialize(#mqtt_packet{}) -> iodata()).
serialize(Packet) -> serialize(Packet, ?MQTT_PROTO_V4).
-spec(serialize(#mqtt_packet{}, version()) -> iodata()).
serialize(#mqtt_packet{header = Header,
variable = Variable,
payload = Payload}, Ver) ->
serialize(Header, serialize_variable(Variable, Ver), serialize_payload(Payload)).
serialize(#mqtt_packet_header{type = Type,
dup = Dup,
qos = QoS,
retain = Retain
}, VariableBin, PayloadBin)
when ?CONNECT =< Type andalso Type =< ?AUTH ->
Len = iolist_size(VariableBin) + iolist_size(PayloadBin),
[<<Type:4, (flag(Dup)):1, (flag(QoS)):2, (flag(Retain)):1>>,
serialize_remaining_len(Len), VariableBin, PayloadBin].
serialize_variable(#mqtt_packet_connect{
proto_name = ProtoName,
proto_ver = ProtoVer,
is_bridge = IsBridge,
clean_start = CleanStart,
will_flag = WillFlag,
will_qos = WillQoS,
will_retain = WillRetain,
keepalive = KeepAlive,
properties = Properties,
clientid = ClientId,
will_props = WillProps,
will_topic = WillTopic,
will_payload = WillPayload,
username = Username,
password = Password}, _Ver) ->
[serialize_binary_data(ProtoName),
<<(case IsBridge of
true -> 16#80 + ProtoVer;
false -> ProtoVer
end):8,
(flag(Username)):1,
(flag(Password)):1,
(flag(WillRetain)):1,
WillQoS:2,
(flag(WillFlag)):1,
(flag(CleanStart)):1,
0:1,
KeepAlive:16/big-unsigned-integer>>,
serialize_properties(Properties, ProtoVer),
serialize_utf8_string(ClientId),
case WillFlag of
true -> [serialize_properties(WillProps, ProtoVer),
serialize_utf8_string(WillTopic),
serialize_binary_data(WillPayload)];
false -> <<>>
end,
serialize_utf8_string(Username, true),
serialize_utf8_string(Password, true)];
serialize_variable(#mqtt_packet_connack{ack_flags = AckFlags,
reason_code = ReasonCode,
properties = Properties}, Ver) ->
[AckFlags, ReasonCode, serialize_properties(Properties, Ver)];
serialize_variable(#mqtt_packet_publish{topic_name = TopicName,
packet_id = PacketId,
properties = Properties}, Ver) ->
[serialize_utf8_string(TopicName),
if
PacketId =:= undefined -> <<>>;
true -> <<PacketId:16/big-unsigned-integer>>
end,
serialize_properties(Properties, Ver)];
serialize_variable(#mqtt_packet_puback{packet_id = PacketId}, Ver)
when Ver == ?MQTT_PROTO_V3; Ver == ?MQTT_PROTO_V4 ->
<<PacketId:16/big-unsigned-integer>>;
serialize_variable(#mqtt_packet_puback{packet_id = PacketId,
reason_code = ReasonCode,
properties = Properties
},
Ver = ?MQTT_PROTO_V5) ->
[<<PacketId:16/big-unsigned-integer>>, ReasonCode,
serialize_properties(Properties, Ver)];
serialize_variable(#mqtt_packet_subscribe{packet_id = PacketId,
properties = Properties,
topic_filters = TopicFilters}, Ver) ->
[<<PacketId:16/big-unsigned-integer>>, serialize_properties(Properties, Ver),
serialize_topic_filters(subscribe, TopicFilters, Ver)];
serialize_variable(#mqtt_packet_suback{packet_id = PacketId,
properties = Properties,
reason_codes = ReasonCodes}, Ver) ->
[<<PacketId:16/big-unsigned-integer>>, serialize_properties(Properties, Ver),
serialize_reason_codes(ReasonCodes)];
serialize_variable(#mqtt_packet_unsubscribe{packet_id = PacketId,
properties = Properties,
topic_filters = TopicFilters}, Ver) ->
[<<PacketId:16/big-unsigned-integer>>, serialize_properties(Properties, Ver),
serialize_topic_filters(unsubscribe, TopicFilters, Ver)];
serialize_variable(#mqtt_packet_unsuback{packet_id = PacketId,
properties = Properties,
reason_codes = ReasonCodes}, Ver) ->
[<<PacketId:16/big-unsigned-integer>>, serialize_properties(Properties, Ver),
serialize_reason_codes(ReasonCodes)];
serialize_variable(#mqtt_packet_disconnect{}, Ver)
when Ver == ?MQTT_PROTO_V3; Ver == ?MQTT_PROTO_V4 ->
<<>>;
serialize_variable(#mqtt_packet_disconnect{reason_code = ReasonCode,
properties = Properties},
Ver = ?MQTT_PROTO_V5) ->
[ReasonCode, serialize_properties(Properties, Ver)];
serialize_variable(#mqtt_packet_disconnect{}, _Ver) ->
<<>>;
serialize_variable(#mqtt_packet_auth{reason_code = ReasonCode,
properties = Properties},
Ver = ?MQTT_PROTO_V5) ->
[ReasonCode, serialize_properties(Properties, Ver)];
serialize_variable(PacketId, ?MQTT_PROTO_V3) when is_integer(PacketId) ->
<<PacketId:16/big-unsigned-integer>>;
serialize_variable(PacketId, ?MQTT_PROTO_V4) when is_integer(PacketId) ->
<<PacketId:16/big-unsigned-integer>>;
serialize_variable(undefined, _Ver) ->
<<>>.
serialize_payload(undefined) -> <<>>;
serialize_payload(Bin) -> Bin.
serialize_properties(_Props, Ver) when Ver =/= ?MQTT_PROTO_V5 ->
<<>>;
serialize_properties(Props, ?MQTT_PROTO_V5) ->
serialize_properties(Props).
serialize_properties(undefined) ->
<<0>>;
serialize_properties(Props) when map_size(Props) == 0 ->
<<0>>;
serialize_properties(Props) when is_map(Props) ->
Bin = << <<(serialize_property(Prop, Val))/binary>> || {Prop, Val} <- maps:to_list(Props) >>,
[serialize_variable_byte_integer(byte_size(Bin)), Bin].
serialize_property(_, undefined) ->
<<>>;
serialize_property('Payload-Format-Indicator', Val) ->
<<16#01, Val>>;
serialize_property('Message-Expiry-Interval', Val) ->
<<16#02, Val:32/big>>;
serialize_property('Content-Type', Val) ->
<<16#03, (serialize_utf8_string(Val))/binary>>;
serialize_property('Response-Topic', Val) ->
<<16#08, (serialize_utf8_string(Val))/binary>>;
serialize_property('Correlation-Data', Val) ->
<<16#09, (byte_size(Val)):16, Val/binary>>;
serialize_property('Subscription-Identifier', Val) ->
<<16#0B, (serialize_variable_byte_integer(Val))/binary>>;
serialize_property('Session-Expiry-Interval', Val) ->
<<16#11, Val:32/big>>;
serialize_property('Assigned-Client-Identifier', Val) ->
<<16#12, (serialize_utf8_string(Val))/binary>>;
serialize_property('Server-Keep-Alive', Val) ->
<<16#13, Val:16/big>>;
serialize_property('Authentication-Method', Val) ->
<<16#15, (serialize_utf8_string(Val))/binary>>;
serialize_property('Authentication-Data', Val) ->
<<16#16, (iolist_size(Val)):16, Val/binary>>;
serialize_property('Request-Problem-Information', Val) ->
<<16#17, Val>>;
serialize_property('Will-Delay-Interval', Val) ->
<<16#18, Val:32/big>>;
serialize_property('Request-Response-Information', Val) ->
<<16#19, Val>>;
serialize_property('Response-Information', Val) ->
<<16#1A, (serialize_utf8_string(Val))/binary>>;
serialize_property('Server-Reference', Val) ->
<<16#1C, (serialize_utf8_string(Val))/binary>>;
serialize_property('Reason-String', Val) ->
<<16#1F, (serialize_utf8_string(Val))/binary>>;
serialize_property('Receive-Maximum', Val) ->
<<16#21, Val:16/big>>;
serialize_property('Topic-Alias-Maximum', Val) ->
<<16#22, Val:16/big>>;
serialize_property('Topic-Alias', Val) ->
<<16#23, Val:16/big>>;
serialize_property('Maximum-QoS', Val) ->
<<16#24, Val>>;
serialize_property('Retain-Available', Val) ->
<<16#25, Val>>;
serialize_property('User-Property', {Key, Val}) ->
<<16#26, (serialize_utf8_pair({Key, Val}))/binary>>;
serialize_property('User-Property', Props) when is_list(Props) ->
<< <<(serialize_property('User-Property', {Key, Val}))/binary>>
|| {Key, Val} <- Props >>;
serialize_property('Maximum-Packet-Size', Val) ->
<<16#27, Val:32/big>>;
serialize_property('Wildcard-Subscription-Available', Val) ->
<<16#28, Val>>;
serialize_property('Subscription-Identifier-Available', Val) ->
<<16#29, Val>>;
serialize_property('Shared-Subscription-Available', Val) ->
<<16#2A, Val>>.
serialize_topic_filters(subscribe, TopicFilters, ?MQTT_PROTO_V5) ->
<< <<(serialize_utf8_string(Topic))/binary,
?RESERVED:2, Rh:2, (flag(Rap)):1,(flag(Nl)):1, QoS:2 >>
|| {Topic, #{rh := Rh, rap := Rap, nl := Nl, qos := QoS}} <- TopicFilters >>;
serialize_topic_filters(subscribe, TopicFilters, _Ver) ->
<< <<(serialize_utf8_string(Topic))/binary, ?RESERVED:6, QoS:2>>
|| {Topic, #{qos := QoS}} <- TopicFilters >>;
serialize_topic_filters(unsubscribe, TopicFilters, _Ver) ->
<< <<(serialize_utf8_string(Topic))/binary>> || Topic <- TopicFilters >>.
serialize_reason_codes(undefined) ->
<<>>;
serialize_reason_codes(ReasonCodes) when is_list(ReasonCodes) ->
<< <<Code>> || Code <- ReasonCodes >>.
serialize_utf8_pair({Name, Value}) ->
<< (serialize_utf8_string(Name))/binary, (serialize_utf8_string(Value))/binary >>.
serialize_binary_data(Bin) ->
[<<(byte_size(Bin)):16/big-unsigned-integer>>, Bin].
serialize_utf8_string(undefined, false) ->
error(utf8_string_undefined);
serialize_utf8_string(undefined, true) ->
<<>>;
serialize_utf8_string(String, _AllowNull) ->
serialize_utf8_string(String).
serialize_utf8_string(String) ->
StringBin = unicode:characters_to_binary(String),
Len = byte_size(StringBin),
true = (Len =< 16#ffff),
<<Len:16/big, StringBin/binary>>.
serialize_remaining_len(I) ->
serialize_variable_byte_integer(I).
serialize_variable_byte_integer(N) when N =< ?LOWBITS ->
<<0:1, N:7>>;
serialize_variable_byte_integer(N) ->
<<1:1, (N rem ?HIGHBIT):7, (serialize_variable_byte_integer(N div ?HIGHBIT))/binary>>.
%% Is the frame too large?
-spec(is_too_large(iodata(), pos_integer()) -> boolean()).
is_too_large(IoData, MaxSize) ->
iolist_size(IoData) >= MaxSize.
get_property(_Key, undefined, Default) ->
Default;
get_property(Key, Props, Default) ->
maps:get(Key, Props, Default).
%% Validate header if sctrict mode. See: mqtt-v5.0: 2.1.3 Flags
validate_header(?CONNECT, 0, 0, 0) -> ok;
validate_header(?CONNACK, 0, 0, 0) -> ok;
validate_header(?PUBLISH, 0, ?QOS_0, _) -> ok;
validate_header(?PUBLISH, _, ?QOS_1, _) -> ok;
validate_header(?PUBLISH, 0, ?QOS_2, _) -> ok;
validate_header(?PUBACK, 0, 0, 0) -> ok;
validate_header(?PUBREC, 0, 0, 0) -> ok;
validate_header(?PUBREL, 0, 1, 0) -> ok;
validate_header(?PUBCOMP, 0, 0, 0) -> ok;
validate_header(?SUBSCRIBE, 0, 1, 0) -> ok;
validate_header(?SUBACK, 0, 0, 0) -> ok;
validate_header(?UNSUBSCRIBE, 0, 1, 0) -> ok;
validate_header(?UNSUBACK, 0, 0, 0) -> ok;
validate_header(?PINGREQ, 0, 0, 0) -> ok;
validate_header(?PINGRESP, 0, 0, 0) -> ok;
validate_header(?DISCONNECT, 0, 0, 0) -> ok;
validate_header(?AUTH, 0, 0, 0) -> ok;
validate_header(_Type, _Dup, _QoS, _Rt) -> error(bad_frame_header).
-compile({inline, [validate_packet_id/1]}).
validate_packet_id(0) -> error(bad_packet_id);
validate_packet_id(_) -> ok.
validate_subqos([3|_]) -> error(bad_subqos);
validate_subqos([_|T]) -> validate_subqos(T);
validate_subqos([]) -> ok.
bool(0) -> false;
bool(1) -> true.
flag(undefined) -> ?RESERVED;
flag(false) -> 0;
flag(true) -> 1;
flag(X) when is_integer(X) -> X;
flag(B) when is_binary(B) -> 1.
fixqos(?PUBREL, 0) -> 1;
fixqos(?SUBSCRIBE, 0) -> 1;
fixqos(?UNSUBSCRIBE, 0) -> 1;
fixqos(_Type, QoS) -> QoS.

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%%--------------------------------------------------------------------
%% Copyright (c) 2020 EMQ Technologies Co., Ltd. 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.
%%--------------------------------------------------------------------
%% @doc MQTT5 Properties
-module(emqtt_props).
-include("emqtt.hrl").
-export([id/1, name/1, filter/2, validate/1]).
%% For tests
-export([all/0]).
-type(prop_name() :: atom()).
-type(prop_id() :: pos_integer()).
-define(PROPS_TABLE,
#{16#01 => {'Payload-Format-Indicator', 'Byte', [?PUBLISH]},
16#02 => {'Message-Expiry-Interval', 'Four-Byte-Integer', [?PUBLISH]},
16#03 => {'Content-Type', 'UTF8-Encoded-String', [?PUBLISH]},
16#08 => {'Response-Topic', 'UTF8-Encoded-String', [?PUBLISH]},
16#09 => {'Correlation-Data', 'Binary-Data', [?PUBLISH]},
16#0B => {'Subscription-Identifier', 'Variable-Byte-Integer', [?PUBLISH, ?SUBSCRIBE]},
16#11 => {'Session-Expiry-Interval', 'Four-Byte-Integer', [?CONNECT, ?CONNACK, ?DISCONNECT]},
16#12 => {'Assigned-Client-Identifier', 'UTF8-Encoded-String', [?CONNACK]},
16#13 => {'Server-Keep-Alive', 'Two-Byte-Integer', [?CONNACK]},
16#15 => {'Authentication-Method', 'UTF8-Encoded-String', [?CONNECT, ?CONNACK, ?AUTH]},
16#16 => {'Authentication-Data', 'Binary-Data', [?CONNECT, ?CONNACK, ?AUTH]},
16#17 => {'Request-Problem-Information', 'Byte', [?CONNECT]},
16#18 => {'Will-Delay-Interval', 'Four-Byte-Integer', ['WILL']},
16#19 => {'Request-Response-Information', 'Byte', [?CONNECT]},
16#1A => {'Response-Information', 'UTF8-Encoded-String', [?CONNACK]},
16#1C => {'Server-Reference', 'UTF8-Encoded-String', [?CONNACK, ?DISCONNECT]},
16#1F => {'Reason-String', 'UTF8-Encoded-String', [?CONNACK, ?DISCONNECT, ?PUBACK,
?PUBREC, ?PUBREL, ?PUBCOMP,
?SUBACK, ?UNSUBACK, ?AUTH]},
16#21 => {'Receive-Maximum', 'Two-Byte-Integer', [?CONNECT, ?CONNACK]},
16#22 => {'Topic-Alias-Maximum', 'Two-Byte-Integer', [?CONNECT, ?CONNACK]},
16#23 => {'Topic-Alias', 'Two-Byte-Integer', [?PUBLISH]},
16#24 => {'Maximum-QoS', 'Byte', [?CONNACK]},
16#25 => {'Retain-Available', 'Byte', [?CONNACK]},
16#26 => {'User-Property', 'UTF8-String-Pair', 'ALL'},
16#27 => {'Maximum-Packet-Size', 'Four-Byte-Integer', [?CONNECT, ?CONNACK]},
16#28 => {'Wildcard-Subscription-Available', 'Byte', [?CONNACK]},
16#29 => {'Subscription-Identifier-Available', 'Byte', [?CONNACK]},
16#2A => {'Shared-Subscription-Available', 'Byte', [?CONNACK]}
}).
-spec(id(prop_name()) -> prop_id()).
id('Payload-Format-Indicator') -> 16#01;
id('Message-Expiry-Interval') -> 16#02;
id('Content-Type') -> 16#03;
id('Response-Topic') -> 16#08;
id('Correlation-Data') -> 16#09;
id('Subscription-Identifier') -> 16#0B;
id('Session-Expiry-Interval') -> 16#11;
id('Assigned-Client-Identifier') -> 16#12;
id('Server-Keep-Alive') -> 16#13;
id('Authentication-Method') -> 16#15;
id('Authentication-Data') -> 16#16;
id('Request-Problem-Information') -> 16#17;
id('Will-Delay-Interval') -> 16#18;
id('Request-Response-Information') -> 16#19;
id('Response-Information') -> 16#1A;
id('Server-Reference') -> 16#1C;
id('Reason-String') -> 16#1F;
id('Receive-Maximum') -> 16#21;
id('Topic-Alias-Maximum') -> 16#22;
id('Topic-Alias') -> 16#23;
id('Maximum-QoS') -> 16#24;
id('Retain-Available') -> 16#25;
id('User-Property') -> 16#26;
id('Maximum-Packet-Size') -> 16#27;
id('Wildcard-Subscription-Available') -> 16#28;
id('Subscription-Identifier-Available') -> 16#29;
id('Shared-Subscription-Available') -> 16#2A;
id(Name) -> error({bad_property, Name}).
-spec(name(prop_id()) -> prop_name()).
name(16#01) -> 'Payload-Format-Indicator';
name(16#02) -> 'Message-Expiry-Interval';
name(16#03) -> 'Content-Type';
name(16#08) -> 'Response-Topic';
name(16#09) -> 'Correlation-Data';
name(16#0B) -> 'Subscription-Identifier';
name(16#11) -> 'Session-Expiry-Interval';
name(16#12) -> 'Assigned-Client-Identifier';
name(16#13) -> 'Server-Keep-Alive';
name(16#15) -> 'Authentication-Method';
name(16#16) -> 'Authentication-Data';
name(16#17) -> 'Request-Problem-Information';
name(16#18) -> 'Will-Delay-Interval';
name(16#19) -> 'Request-Response-Information';
name(16#1A) -> 'Response-Information';
name(16#1C) -> 'Server-Reference';
name(16#1F) -> 'Reason-String';
name(16#21) -> 'Receive-Maximum';
name(16#22) -> 'Topic-Alias-Maximum';
name(16#23) -> 'Topic-Alias';
name(16#24) -> 'Maximum-QoS';
name(16#25) -> 'Retain-Available';
name(16#26) -> 'User-Property';
name(16#27) -> 'Maximum-Packet-Size';
name(16#28) -> 'Wildcard-Subscription-Available';
name(16#29) -> 'Subscription-Identifier-Available';
name(16#2A) -> 'Shared-Subscription-Available';
name(Id) -> error({unsupported_property, Id}).
filter(PacketType, Props) when is_map(Props) ->
maps:from_list(filter(PacketType, maps:to_list(Props)));
filter(PacketType, Props) when ?CONNECT =< PacketType, PacketType =< ?AUTH, is_list(Props) ->
Filter = fun(Name) ->
case maps:find(id(Name), ?PROPS_TABLE) of
{ok, {Name, _Type, 'ALL'}} ->
true;
{ok, {Name, _Type, AllowedTypes}} ->
lists:member(PacketType, AllowedTypes);
error -> false
end
end,
[Prop || Prop = {Name, _} <- Props, Filter(Name)].
validate(Props) when is_map(Props) ->
lists:foreach(fun validate_prop/1, maps:to_list(Props)).
validate_prop(Prop = {Name, Val}) ->
case maps:find(id(Name), ?PROPS_TABLE) of
{ok, {Name, Type, _}} ->
validate_value(Type, Val)
orelse error(bad_property, Prop);
error ->
error({bad_property, Prop})
end.
validate_value('Byte', Val) ->
is_integer(Val) andalso Val =< 16#FF;
validate_value('Two-Byte-Integer', Val) ->
is_integer(Val) andalso 0 =< Val andalso Val =< 16#FFFF;
validate_value('Four-Byte-Integer', Val) ->
is_integer(Val) andalso 0 =< Val andalso Val =< 16#FFFFFFFF;
validate_value('Variable-Byte-Integer', Val) ->
is_integer(Val) andalso 0 =< Val andalso Val =< 16#7FFFFFFF;
validate_value('UTF8-String-Pair', {Name, Val}) ->
validate_value('UTF8-Encoded-String', Name)
andalso validate_value('UTF8-Encoded-String', Val);
validate_value('UTF8-String-Pair', Pairs) when is_list(Pairs) ->
lists:foldl(fun(Pair, OK) ->
OK andalso validate_value('UTF8-String-Pair', Pair)
end, true, Pairs);
validate_value('UTF8-Encoded-String', Val) ->
is_binary(Val);
validate_value('Binary-Data', Val) ->
is_binary(Val);
validate_value(_Type, _Val) -> false.
-spec(all() -> map()).
all() -> ?PROPS_TABLE.

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%%--------------------------------------------------------------------
%% Copyright (c) 2020 EMQ Technologies Co., Ltd. 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(emqtt_sock).
-export([connect/4, send/2, recv/2, close/1 ]).
-export([ sockname/1, setopts/2, getstat/2 ]).
-record(ssl_socket, {
tcp,
ssl
}).
-type(socket() :: inet:socket() | #ssl_socket{}).
-type(sockname() :: {inet:ip_address(), inet:port_number()}).
-type(option() :: gen_tcp:connect_option() | {ssl_opts, [ssl:ssl_option()]}).
-export_type([socket/0, option/0]).
-define(DEFAULT_TCP_OPTIONS, [binary, {packet, raw}, {active, false},
{nodelay, true}]).
-spec(connect(inet:ip_address() | inet:hostname(),
inet:port_number(), [option()], timeout())
-> {ok, socket()} | {error, term()}).
connect(Host, Port, SockOpts, Timeout) ->
TcpOpts = merge_opts(?DEFAULT_TCP_OPTIONS,
lists:keydelete(ssl_opts, 1, SockOpts)),
case gen_tcp:connect(Host, Port, TcpOpts, Timeout) of
{ok, Sock} ->
case lists:keyfind(ssl_opts, 1, SockOpts) of
{ssl_opts, SslOpts} ->
ssl_upgrade(Sock, SslOpts, Timeout);
false ->
{ok, Sock}
end;
{error, Reason} ->
{error, Reason}
end.
ssl_upgrade(Sock, SslOpts, Timeout) ->
TlsVersions = proplists:get_value(versions, SslOpts, []),
Ciphers = proplists:get_value(ciphers, SslOpts, default_ciphers(TlsVersions)),
SslOpts2 = merge_opts(SslOpts, [{ciphers, Ciphers}]),
case ssl:connect(Sock, SslOpts2, Timeout) of
{ok, SslSock} ->
ok = ssl:controlling_process(SslSock, self()),
{ok, #ssl_socket{tcp = Sock, ssl = SslSock}};
{error, Reason} ->
{error, Reason}
end.
-spec(send(socket(), iodata()) -> ok | {error, einval | closed}).
send(Sock, Data) when is_port(Sock) ->
gen_tcp:send(Sock, Data);
send(#ssl_socket{ssl = SslSock}, Data) ->
ssl:send(SslSock, Data).
-spec(recv(socket(), non_neg_integer())
-> {ok, iodata()} | {error, closed | inet:posix()}).
recv(Sock, Length) when is_port(Sock) ->
gen_tcp:recv(Sock, Length);
recv(#ssl_socket{ssl = SslSock}, Length) ->
ssl:recv(SslSock, Length).
-spec(close(socket()) -> ok).
close(Sock) when is_port(Sock) ->
gen_tcp:close(Sock);
close(#ssl_socket{ssl = SslSock}) ->
ssl:close(SslSock).
-spec(setopts(socket(), [gen_tcp:option() | ssl:socketoption()]) -> ok).
setopts(Sock, Opts) when is_port(Sock) ->
inet:setopts(Sock, Opts);
setopts(#ssl_socket{ssl = SslSock}, Opts) ->
ssl:setopts(SslSock, Opts).
-spec(getstat(socket(), [atom()])
-> {ok, [{atom(), integer()}]} | {error, term()}).
getstat(Sock, Options) when is_port(Sock) ->
inet:getstat(Sock, Options);
getstat(#ssl_socket{tcp = Sock}, Options) ->
inet:getstat(Sock, Options).
-spec(sockname(socket()) -> {ok, sockname()} | {error, term()}).
sockname(Sock) when is_port(Sock) ->
inet:sockname(Sock);
sockname(#ssl_socket{ssl = SslSock}) ->
ssl:sockname(SslSock).
-spec(merge_opts(list(), list()) -> list()).
merge_opts(Defaults, Options) ->
lists:foldl(
fun({Opt, Val}, Acc) ->
lists:keystore(Opt, 1, Acc, {Opt, Val});
(Opt, Acc) ->
lists:usort([Opt | Acc])
end, Defaults, Options).
default_ciphers(TlsVersions) ->
lists:foldl(
fun(TlsVer, Ciphers) ->
Ciphers ++ ssl:cipher_suites(all, TlsVer)
end, [], TlsVersions).