Mercurial > prosody-modules

annotate mod_pubsub_mqtt/mqtt.lib.lua @ 5833:58df53eefa28

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mod_pubsub_mqtt: Update to MQTT 3.1.1
author Matthew Wild <mwild1@gmail.com>
date Wed, 07 Feb 2024 11:57:30 +0000
parents d2a84e6aed2b
children
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rev   line source
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58df53eefa28 mod_pubsub_mqtt: Update to MQTT 3.1.1
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diff changeset
1 local bit = require "util.bitcompat";
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2
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3 local stream_mt = {};
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4 stream_mt.__index = stream_mt;
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5
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6 function stream_mt:read_bytes(n_bytes)
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7 module:log("debug", "Reading %d bytes... (buffer: %d)", n_bytes, #self.buffer);
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8 local data = self.buffer;
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9 if not data then
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10 module:log("debug", "No data, pausing.");
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11 data = coroutine.yield();
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12 module:log("debug", "Have %d bytes of data now (want %d)", #data, n_bytes);
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13 end
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14 if #data >= n_bytes then
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15 data, self.buffer = data:sub(1, n_bytes), data:sub(n_bytes+1);
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16 elseif #data < n_bytes then
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17 module:log("debug", "Not enough data (only %d bytes out of %d), pausing.", #data, n_bytes);
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18 self.buffer = data..coroutine.yield();
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19 module:log("debug", "Now we have %d bytes, reading...", #data);
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20 return self:read_bytes(n_bytes);
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21 end
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22 module:log("debug", "Returning %d bytes (buffer: %d)", #data, #self.buffer);
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23 return data;
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24 end
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25
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26 function stream_mt:read_string()
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27 local len1, len2 = self:read_bytes(2):byte(1,2);
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28 local len = bit.lshift(len1, 8) + len2;
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29 return self:read_bytes(len), len+2;
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30 end
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31
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32 function stream_mt:read_word()
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33 local len1, len2 = self:read_bytes(2):byte(1,2);
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34 local result = bit.lshift(len1, 8) + len2;
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35 module:log("debug", "read_word(%02x, %02x) = %04x (%d)", len1, len2, result, result);
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36 return result;
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37 end
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38
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39 local function hasbit(byte, n_bit)
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40 return bit.band(byte, 2^n_bit) ~= 0;
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41 end
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42
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43 local function encode_string(str)
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44 return string.char(bit.band(#str, 0xff00), bit.band(#str, 0x00ff))..str;
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45 end
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46
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47 local packet_type_codes = {
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48 "connect", "connack",
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49 "publish", "puback", "pubrec", "pubrel", "pubcomp",
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50 "subscribe", "suback", "unsubscribe", "unsuback",
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51 "pingreq", "pingresp",
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52 "disconnect"
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53 };
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54
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55 function stream_mt:read_packet()
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56 local packet = {};
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57 local header = self:read_bytes(1):byte();
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58 packet.type = packet_type_codes[bit.rshift(bit.band(header, 0xf0), 4)];
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59 packet.dup = bit.band(header, 0x08) == 0x08;
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60 packet.qos = bit.rshift(bit.band(header, 0x06), 1);
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61 packet.retain = bit.band(header, 0x01) == 0x01;
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62
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63 -- Get length
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64 local length, multiplier = 0, 1;
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65 repeat
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66 local digit = self:read_bytes(1):byte();
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67 length = length + bit.band(digit, 0x7f)*multiplier;
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68 multiplier = multiplier*128;
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69 until bit.band(digit, 0x80) == 0;
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70 packet.length = length;
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71 if packet.type == "connect" then
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72 if self:read_string() ~= "MQTT" then
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73 module:log("warn", "Unexpected packet signature!");
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74 packet.type = nil; -- Invalid packet
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75 else
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76 packet.version = self:read_bytes(1):byte();
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77 module:log("debug", "ver: %02x", packet.version);
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78 if packet.version ~= 0x04 then
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79 module:log("warn", "MQTT version mismatch (got %02x, we support %02x", packet.version, 0x04);
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80 end
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81 local flags = self:read_bytes(1):byte();
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82 module:log("debug", "flags: %02x", flags);
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83 packet.keepalive_timer = self:read_bytes(2):byte();
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84 module:log("debug", "keepalive: %d", packet.keepalive_timer);
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85 packet.connect_flags = {};
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86 length = length - 11;
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87 packet.connect_flags = {
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88 clean_session = hasbit(flags, 1);
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89 will = hasbit(flags, 2);
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90 will_qos = bit.band(bit.rshift(flags, 2), 0x02);
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91 will_retain = hasbit(flags, 5);
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92 user_name = hasbit(flags, 7);
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93 password = hasbit(flags, 6);
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94 };
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95 module:log("debug", "%s", require "util.serialization".serialize(packet.connect_flags, "debug"));
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96 module:log("debug", "Reading client_id...");
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97 packet.client_id = self:read_string();
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98 if packet.connect_flags.will then
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99 module:log("debug", "Reading will...");
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100 packet.will = {
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101 topic = self:read_string();
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102 message = self:read_string();
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103 qos = packet.connect_flags.will_qos;
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104 retain = packet.connect_flags.will_retain;
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105 };
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106 end
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107 if packet.connect_flags.user_name then
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108 module:log("debug", "Reading username...");
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109 packet.username = self:read_string();
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110 end
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111 if packet.connect_flags.password then
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112 module:log("debug", "Reading password...");
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113 packet.password = self:read_string();
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114 end
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115 module:log("debug", "Done parsing connect!");
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116 length = 0; -- No payload left
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117 end
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118 elseif packet.type == "publish" then
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
119 packet.topic = self:read_string();
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
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parents:
diff changeset
120 length = length - (#packet.topic+2);
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Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
121 if packet.qos == 1 or packet.qos == 2 then
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
122 packet.id = self:read_bytes(2);
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
123 length = length - 2;
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
124 end
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
125 elseif packet.type == "subscribe" then
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
126 if packet.qos == 1 or packet.qos == 2 then
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
127 packet.id = self:read_bytes(2);
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
128 length = length - 2;
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
129 end
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
130 local topics = {};
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Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
131 while length > 0 do
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parents:
diff changeset
132 local topic, len = self:read_string();
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Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
133 table.insert(topics, topic);
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
134 self:read_bytes(1); -- QoS not used
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Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
135 length = length - (len+1);
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
136 end
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
137 packet.topics = topics;
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
138 end
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
139 if length > 0 then
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
140 packet.data = self:read_bytes(length);
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Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
141 end
5833
58df53eefa28 mod_pubsub_mqtt: Update to MQTT 3.1.1
Matthew Wild <mwild1@gmail.com>
parents: 5114
diff changeset
142 module:log("debug", "MQTT packet complete!");
1240
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Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
143 return packet;
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Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
144 end
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
145
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
146 local function new_parser(self)
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Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
147 return coroutine.wrap(function (data)
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parents:
diff changeset
148 self.buffer = data;
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parents:
diff changeset
149 while true do
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
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parents:
diff changeset
150 data = coroutine.yield(self:read_packet());
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parents:
diff changeset
151 module:log("debug", "Parser: %d new bytes", #data);
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parents:
diff changeset
152 self.buffer = (self.buffer or "")..data;
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Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
153 end
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
154 end);
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
155 end
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
156
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
157 function stream_mt:feed(data)
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Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
158 local packets = {};
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
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parents:
diff changeset
159 local packet = self.parser(data);
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
160 while packet do
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
161 module:log("debug", "Received packet");
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
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parents:
diff changeset
162 table.insert(packets, packet);
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
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parents:
diff changeset
163 packet = self.parser("");
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
164 end
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
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parents:
diff changeset
165 module:log("debug", "Returning %d packets", #packets);
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
166 return packets;
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
167 end
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
168
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
169 local function new_stream()
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
170 local stream = setmetatable({}, stream_mt);
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
171 stream.parser = new_parser(stream);
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
172 return stream;
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
173 end
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
174
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
175 local function serialize_packet(packet)
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
176 local type_num = 0;
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
177 for i, v in ipairs(packet_type_codes) do -- FIXME: I'm so tired right now.
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
178 if v == packet.type then
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
179 type_num = i;
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
180 break;
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
181 end
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
182 end
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
183 local header = string.char(bit.lshift(type_num, 4));
1343
7dbde05b48a9 all the things: Remove trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 1240
diff changeset
184
1240
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
185 if packet.type == "publish" then
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
186 local topic = packet.topic or "";
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
187 packet.data = string.char(bit.band(#topic, 0xff00), bit.band(#topic, 0x00ff))..topic..packet.data;
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
188 elseif packet.type == "suback" then
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
189 local t = {};
5833
58df53eefa28 mod_pubsub_mqtt: Update to MQTT 3.1.1
Matthew Wild <mwild1@gmail.com>
parents: 5114
diff changeset
190 for i, result_code in ipairs(packet.results) do
58df53eefa28 mod_pubsub_mqtt: Update to MQTT 3.1.1
Matthew Wild <mwild1@gmail.com>
parents: 5114
diff changeset
191 table.insert(t, string.char(result_code));
1240
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
192 end
5833
58df53eefa28 mod_pubsub_mqtt: Update to MQTT 3.1.1
Matthew Wild <mwild1@gmail.com>
parents: 5114
diff changeset
193 packet.data = packet.id..table.concat(t);
1240
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
194 end
1343
7dbde05b48a9 all the things: Remove trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 1240
diff changeset
195
1240
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
196 -- Get length
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
197 local length = #(packet.data or "");
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
198 repeat
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
199 local digit = length%128;
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
200 length = math.floor(length/128);
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
201 if length > 0 then
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
202 digit = bit.bor(digit, 0x80);
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
203 end
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
204 header = header..string.char(digit); -- FIXME: ...
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
205 until length <= 0;
1343
7dbde05b48a9 all the things: Remove trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 1240
diff changeset
206
1240
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
207 return header..(packet.data or "");
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
208 end
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
209
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
210 return {
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
211 new_stream = new_stream;
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
212 serialize_packet = serialize_packet;
e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
213 };