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mqtt.c
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/*
* MQTT Protocol
*
* Copyright 2020 Baptiste Assmann <bedis9@gmail.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <haproxy/chunk.h>
#include <haproxy/mqtt.h>
uint8_t mqtt_cpt_flags[MQTT_CPT_ENTRIES] = {
[MQTT_CPT_INVALID] = 0x00,
[MQTT_CPT_CONNECT] = 0x00,
[MQTT_CPT_CONNACK] = 0x00,
/* MQTT_CPT_PUBLISH flags can have different values (DUP, QoS, RETAIN), must be
* check more carefully
*/
[MQTT_CPT_PUBLISH] = 0x0F,
[MQTT_CPT_PUBACK] = 0x00,
[MQTT_CPT_PUBREC] = 0x00,
[MQTT_CPT_PUBREL] = 0x02,
[MQTT_CPT_PUBCOMP] = 0x00,
[MQTT_CPT_SUBSCRIBE] = 0x02,
[MQTT_CPT_SUBACK] = 0x00,
[MQTT_CPT_UNSUBSCRIBE] = 0x02,
[MQTT_CPT_UNSUBACK] = 0x00,
[MQTT_CPT_PINGREQ] = 0x00,
[MQTT_CPT_PINGRESP] = 0x00,
[MQTT_CPT_DISCONNECT] = 0x00,
[MQTT_CPT_AUTH] = 0x00,
};
const struct ist mqtt_fields_string[MQTT_FN_ENTRIES] = {
[MQTT_FN_INVALID] = IST(""),
/* it's MQTT 3.1, 3.1.1 and 5.0, those fields have no unique id, so we use strings */
[MQTT_FN_FLAGS] = IST("flags"),
[MQTT_FN_REASON_CODE] = IST("reason_code"), /* MQTT 3.1 and 3.1.1: return_code */
[MQTT_FN_PROTOCOL_NAME] = IST("protocol_name"),
[MQTT_FN_PROTOCOL_VERSION] = IST("protocol_version"), /* MQTT 3.1.1: protocol_level */
[MQTT_FN_CLIENT_IDENTIFIER] = IST("client_identifier"),
[MQTT_FN_WILL_TOPIC] = IST("will_topic"),
[MQTT_FN_WILL_PAYLOAD] = IST("will_payload"), /* MQTT 3.1 and 3.1.1: will_message */
[MQTT_FN_USERNAME] = IST("username"),
[MQTT_FN_PASSWORD] = IST("password"),
[MQTT_FN_KEEPALIVE] = IST("keepalive"),
/* from here, it's MQTT 5.0 only */
[MQTT_FN_PAYLOAD_FORMAT_INDICATOR] = IST("1"),
[MQTT_FN_MESSAGE_EXPIRY_INTERVAL] = IST("2"),
[MQTT_FN_CONTENT_TYPE] = IST("3"),
[MQTT_FN_RESPONSE_TOPIC] = IST("8"),
[MQTT_FN_CORRELATION_DATA] = IST("9"),
[MQTT_FN_SUBSCRIPTION_IDENTIFIER] = IST("11"),
[MQTT_FN_SESSION_EXPIRY_INTERVAL] = IST("17"),
[MQTT_FN_ASSIGNED_CLIENT_IDENTIFIER] = IST("18"),
[MQTT_FN_SERVER_KEEPALIVE] = IST("19"),
[MQTT_FN_AUTHENTICATION_METHOD] = IST("21"),
[MQTT_FN_AUTHENTICATION_DATA] = IST("22"),
[MQTT_FN_REQUEST_PROBLEM_INFORMATION] = IST("23"),
[MQTT_FN_DELAY_INTERVAL] = IST("24"),
[MQTT_FN_REQUEST_RESPONSE_INFORMATION] = IST("25"),
[MQTT_FN_RESPONSE_INFORMATION] = IST("26"),
[MQTT_FN_SERVER_REFERENCE] = IST("28"),
[MQTT_FN_REASON_STRING] = IST("31"),
[MQTT_FN_RECEIVE_MAXIMUM] = IST("33"),
[MQTT_FN_TOPIC_ALIAS_MAXIMUM] = IST("34"),
[MQTT_FN_TOPIC_ALIAS] = IST("35"),
[MQTT_FN_MAXIMUM_QOS] = IST("36"),
[MQTT_FN_RETAIN_AVAILABLE] = IST("37"),
[MQTT_FN_USER_PROPERTY] = IST("38"),
[MQTT_FN_MAXIMUM_PACKET_SIZE] = IST("39"),
[MQTT_FN_WILDCARD_SUBSCRIPTION_AVAILABLE] = IST("40"),
[MQTT_FN_SUBSCRIPTION_IDENTIFIERS_AVAILABLE] = IST("41"),
[MQTT_FN_SHARED_SUBSCRIPTION_AVAILABLE] = IST("42"),
};
/* list of supported capturable field names for each MQTT control packet type */
const uint64_t mqtt_fields_per_packet[MQTT_CPT_ENTRIES] = {
[MQTT_CPT_INVALID] = 0,
[MQTT_CPT_CONNECT] = MQTT_FN_BIT_PROTOCOL_NAME | MQTT_FN_BIT_PROTOCOL_VERSION |
MQTT_FN_BIT_FLAGS | MQTT_FN_BIT_KEEPALIVE |
MQTT_FN_BIT_SESSION_EXPIRY_INTERVAL | MQTT_FN_BIT_RECEIVE_MAXIMUM |
MQTT_FN_BIT_MAXIMUM_PACKET_SIZE | MQTT_FN_BIT_TOPIC_ALIAS_MAXIMUM |
MQTT_FN_BIT_REQUEST_RESPONSE_INFORMATION | MQTT_FN_BIT_REQUEST_PROBLEM_INFORMATION |
MQTT_FN_BIT_USER_PROPERTY | MQTT_FN_BIT_AUTHENTICATION_METHOD |
MQTT_FN_BIT_AUTHENTICATION_DATA | MQTT_FN_BIT_CLIENT_IDENTIFIER |
MQTT_FN_BIT_DELAY_INTERVAL | MQTT_FN_BIT_PAYLOAD_FORMAT_INDICATOR |
MQTT_FN_BIT_MESSAGE_EXPIRY_INTERVAL | MQTT_FN_BIT_CONTENT_TYPE |
MQTT_FN_BIT_RESPONSE_TOPIC | MQTT_FN_BIT_CORRELATION_DATA |
MQTT_FN_BIT_USER_PROPERTY | MQTT_FN_BIT_WILL_TOPIC |
MQTT_FN_BIT_WILL_PAYLOAD | MQTT_FN_BIT_USERNAME |
MQTT_FN_BIT_PASSWORD,
[MQTT_CPT_CONNACK] = MQTT_FN_BIT_FLAGS | MQTT_FN_BIT_PROTOCOL_VERSION |
MQTT_FN_BIT_REASON_CODE | MQTT_FN_BIT_SESSION_EXPIRY_INTERVAL |
MQTT_FN_BIT_RECEIVE_MAXIMUM | MQTT_FN_BIT_MAXIMUM_QOS |
MQTT_FN_BIT_RETAIN_AVAILABLE | MQTT_FN_BIT_MAXIMUM_PACKET_SIZE |
MQTT_FN_BIT_ASSIGNED_CLIENT_IDENTIFIER | MQTT_FN_BIT_TOPIC_ALIAS_MAXIMUM |
MQTT_FN_BIT_REASON_STRING | MQTT_FN_BIT_WILDCARD_SUBSCRIPTION_AVAILABLE |
MQTT_FN_BIT_SUBSCRIPTION_IDENTIFIERS_AVAILABLE| MQTT_FN_BIT_SHARED_SUBSCRIPTION_AVAILABLE |
MQTT_FN_BIT_SERVER_KEEPALIVE | MQTT_FN_BIT_RESPONSE_INFORMATION |
MQTT_FN_BIT_SERVER_REFERENCE | MQTT_FN_BIT_USER_PROPERTY |
MQTT_FN_BIT_AUTHENTICATION_METHOD | MQTT_FN_BIT_AUTHENTICATION_DATA,
[MQTT_CPT_PUBLISH] = MQTT_FN_BIT_PAYLOAD_FORMAT_INDICATOR | MQTT_FN_BIT_MESSAGE_EXPIRY_INTERVAL |
MQTT_FN_BIT_CONTENT_TYPE | MQTT_FN_BIT_RESPONSE_TOPIC |
MQTT_FN_BIT_CORRELATION_DATA | MQTT_FN_BIT_SUBSCRIPTION_IDENTIFIER |
MQTT_FN_BIT_TOPIC_ALIAS | MQTT_FN_BIT_USER_PROPERTY,
[MQTT_CPT_PUBACK] = MQTT_FN_BIT_REASON_CODE | MQTT_FN_BIT_REASON_STRING | MQTT_FN_BIT_USER_PROPERTY,
[MQTT_CPT_PUBREC] = MQTT_FN_BIT_REASON_CODE | MQTT_FN_BIT_REASON_STRING | MQTT_FN_BIT_USER_PROPERTY,
[MQTT_CPT_PUBREL] = MQTT_FN_BIT_REASON_CODE | MQTT_FN_BIT_REASON_STRING | MQTT_FN_BIT_USER_PROPERTY,
[MQTT_CPT_PUBCOMP] = MQTT_FN_BIT_REASON_CODE | MQTT_FN_BIT_REASON_STRING | MQTT_FN_BIT_USER_PROPERTY,
[MQTT_CPT_SUBSCRIBE] = MQTT_FN_BIT_SUBSCRIPTION_IDENTIFIER | MQTT_FN_BIT_USER_PROPERTY,
[MQTT_CPT_SUBACK] = MQTT_FN_BIT_REASON_STRING | MQTT_FN_BIT_USER_PROPERTY,
[MQTT_CPT_UNSUBSCRIBE] = MQTT_FN_BIT_USER_PROPERTY,
[MQTT_CPT_UNSUBACK] = MQTT_FN_BIT_REASON_STRING | MQTT_FN_BIT_USER_PROPERTY,
[MQTT_CPT_PINGREQ] = 0,
[MQTT_CPT_PINGRESP] = 0,
[MQTT_CPT_DISCONNECT] = MQTT_FN_BIT_REASON_CODE | MQTT_FN_BIT_SESSION_EXPIRY_INTERVAL |
MQTT_FN_BIT_SERVER_REFERENCE | MQTT_FN_BIT_REASON_STRING |
MQTT_FN_BIT_USER_PROPERTY,
[MQTT_CPT_AUTH] = MQTT_FN_BIT_AUTHENTICATION_METHOD | MQTT_FN_BIT_AUTHENTICATION_DATA |
MQTT_FN_BIT_REASON_STRING | MQTT_FN_BIT_USER_PROPERTY,
};
/* Checks the first byte of a message to read the fixed header and extract the
* packet type and flags. <parser> is supposed to point to the fix header byte.
*
* Fix header looks like:
* +-------+-----------+-----------+-----------+---------+----------+----------+---------+------------+
* | bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
* +-------+-----------+-----------+-----------+---------+----------+----------+---------+------------+
* | field | MQTT Control Packet Type | Flags specific to each Control Packet type |
* +-------+---------------------------------------------+--------------------------------------------+
*
* On success, <ptk> is updated with the packet type and flags and the new parser
* state is returned. On error, IST_NULL is returned.
*/
static inline struct ist mqtt_read_fixed_hdr(struct ist parser, struct mqtt_pkt *pkt)
{
uint8_t type = (uint8_t)*istptr(parser);
uint8_t ptype = (type & 0xF0) >> 4;
uint8_t flags = type & 0x0F;
if (ptype == MQTT_CPT_INVALID || ptype >= MQTT_CPT_ENTRIES || flags != mqtt_cpt_flags[ptype])
return IST_NULL;
pkt->fixed_hdr.type = ptype;
pkt->fixed_hdr.flags = flags;
return istnext(parser);
}
/* Reads a one byte integer. more information here :
* https://docs.oasis-open.org/mqtt/mqtt/v5.0/os/mqtt-v5.0-os.html#_Toc3901007
*
* <parser> is supposed to point to the first byte of the integer. On success
* the integer is stored in <*i>, if provided, and the new parser state is returned. On
* error, IST_NULL is returned.
*/
static inline struct ist mqtt_read_1byte_int(struct ist parser, uint8_t *i)
{
if (istlen(parser) < 1)
return IST_NULL;
if (i)
*i = (uint8_t)*istptr(parser);
parser = istnext(parser);
return parser;
}
/* Reads a two byte integer. more information here :
* https://docs.oasis-open.org/mqtt/mqtt/v5.0/os/mqtt-v5.0-os.html#_Toc3901008
*
* <parser> is supposed to point to the first byte of the integer. On success
* the integer is stored in <*i>, if provided, and the new parser state is returned. On
* error, IST_NULL is returned.
*/
static inline struct ist mqtt_read_2byte_int(struct ist parser, uint16_t *i)
{
if (istlen(parser) < 2)
return IST_NULL;
if (i) {
*i = (uint8_t)*istptr(parser) << 8;
*i += (uint8_t)*(istptr(parser) + 1);
}
parser = istadv(parser, 2);
return parser;
}
/* Reads a four byte integer. more information here :
* https://docs.oasis-open.org/mqtt/mqtt/v5.0/os/mqtt-v5.0-os.html#_Toc3901009
*
* <parser> is supposed to point to the first byte of the integer. On success
* the integer is stored in <*i>, if provided, and the new parser state is returned. On
* error, IST_NULL is returned.
*/
static inline struct ist mqtt_read_4byte_int(struct ist parser, uint32_t *i)
{
if (istlen(parser) < 4)
return IST_NULL;
if (i) {
*i = (uint8_t)*istptr(parser) << 24;
*i += (uint8_t)*(istptr(parser) + 1) << 16;
*i += (uint8_t)*(istptr(parser) + 2) << 8;
*i += (uint8_t)*(istptr(parser) + 3);
}
parser = istadv(parser, 4);
return parser;
}
/* Reads a variable byte integer. more information here :
* https://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html#_Toc398718023
* https://docs.oasis-open.org/mqtt/mqtt/v5.0/os/mqtt-v5.0-os.html#_Toc3901011
*
* It is encoded using a variable length encoding scheme which uses a single
* byte for values up to 127. Larger values are handled as follows. The least
* significant seven bits of each byte encode the data, and the most significant
* bit is used to indicate that there are following bytes in the representation.
* Thus each byte encodes 128 values and a "continuation bit".
*
* The maximum number of bytes in the Remaining Length field is four
* (MQTT_REMAINING_LENGHT_MAX_SIZE).
*
* <parser> is supposed to point to the first byte of the integer. On success
* the integer is stored in <*i> and the new parser state is returned. On
* error, IST_NULL is returned.
*/
static inline struct ist mqtt_read_varint(struct ist parser, uint32_t *i)
{
int off, m;
off = m = 0;
if (i)
*i = 0;
for (off = 0; off < MQTT_REMAINING_LENGHT_MAX_SIZE && istlen(parser); off++) {
uint8_t byte = (uint8_t)*istptr(parser);
if (i) {
*i += (byte & 127) << m;
m += 7; /* preparing <m> for next byte */
}
parser = istnext(parser);
/* we read the latest byte for the remaining length field */
if (byte <= 127)
break;
}
if (off == MQTT_REMAINING_LENGHT_MAX_SIZE)
return IST_NULL;
return parser;
}
/* Reads a MQTT string. more information here :
* http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html#_Toc398718016
* https://docs.oasis-open.org/mqtt/mqtt/v5.0/os/mqtt-v5.0-os.html#_Toc3901010
*
* In MQTT, strings are prefixed by their size, encoded over 2 bytes:
* byte 1: length MSB
* byte 2: length LSB
* byte 3: string
* ...
*
* string size is MSB * 256 + LSB
*
* <parser> is supposed to point to the first byte of the string. On success the
* string is stored in <*str>, if provided, and the new parser state is
* returned. On error, IST_NULL is returned.
*/
static inline struct ist mqtt_read_string(struct ist parser, struct ist *str)
{
uint16_t len = 0;
/* read and compute the string length */
if (istlen(parser) < 2)
goto error;
parser = mqtt_read_2byte_int(parser, &len);
if (!isttest(parser) || istlen(parser) < len)
goto error;
if (str) {
str->ptr = istptr(parser);
str->len = len;
}
return istadv(parser, len);
error:
return IST_NULL;
}
/* Helper function to convert a unsigned integer to a string. The result is
* written in <buf>. On success, the written size is returned, otherwise, on
* error, 0 is returned.
*/
static inline size_t mqtt_uint2str(struct buffer *buf, uint32_t i)
{
char *end;
end = ultoa_o(i, buf->area, buf->size);
if (!end)
return 0;
buf->data = end - buf->area;
return buf->data;
}
/* Extracts the value of a <fieldname_id> of type <type> from a given MQTT
* message <msg>. IST_NULL is returned if an error occurred while parsing or if
* the field could not be found. If more data are required, the message with a
* length set to 0 is returned. If the field is found, the response is returned
* as a struct ist.
*/
struct ist mqtt_field_value(struct ist msg, int type, int fieldname_id)
{
struct buffer *trash = get_trash_chunk();
struct mqtt_pkt mpkt;
struct ist res;
switch (mqtt_validate_message(msg, &mpkt)) {
case MQTT_VALID_MESSAGE:
if (mpkt.fixed_hdr.type != type)
goto not_found_or_invalid;
break;
case MQTT_NEED_MORE_DATA:
goto need_more;
case MQTT_INVALID_MESSAGE:
goto not_found_or_invalid;
}
switch (type) {
case MQTT_CPT_CONNECT:
switch (fieldname_id) {
case MQTT_FN_FLAGS:
if (!mqtt_uint2str(trash, mpkt.data.connect.var_hdr.flags))
goto not_found_or_invalid;
res = ist2(trash->area, trash->data);
goto end;
case MQTT_FN_PROTOCOL_NAME:
if (!istlen(mpkt.data.connect.var_hdr.protocol_name))
goto not_found_or_invalid;
res = mpkt.data.connect.var_hdr.protocol_name;
goto end;
case MQTT_FN_PROTOCOL_VERSION:
if (!mqtt_uint2str(trash, mpkt.data.connect.var_hdr.protocol_version))
goto not_found_or_invalid;
res = ist2(trash->area, trash->data);
goto end;
case MQTT_FN_CLIENT_IDENTIFIER:
if (!istlen(mpkt.data.connect.payload.client_identifier))
goto not_found_or_invalid;
res = mpkt.data.connect.payload.client_identifier;
goto end;
case MQTT_FN_WILL_TOPIC:
if (!istlen(mpkt.data.connect.payload.will_topic))
goto not_found_or_invalid;
res = mpkt.data.connect.payload.will_topic;
goto end;
case MQTT_FN_WILL_PAYLOAD:
if (!istlen(mpkt.data.connect.payload.will_payload))
goto not_found_or_invalid;
res = mpkt.data.connect.payload.will_payload;
goto end;
case MQTT_FN_USERNAME:
if (!istlen(mpkt.data.connect.payload.username))
goto not_found_or_invalid;
res = mpkt.data.connect.payload.username;
goto end;
case MQTT_FN_PASSWORD:
if (!istlen(mpkt.data.connect.payload.password))
goto not_found_or_invalid;
res = mpkt.data.connect.payload.password;
goto end;
case MQTT_FN_KEEPALIVE:
if (!mqtt_uint2str(trash, mpkt.data.connect.var_hdr.keepalive))
goto not_found_or_invalid;
res = ist2(trash->area, trash->data);
goto end;
case MQTT_FN_PAYLOAD_FORMAT_INDICATOR:
if ((mpkt.data.connect.var_hdr.protocol_version != MQTT_VERSION_5_0) ||
!(mpkt.data.connect.var_hdr.flags & MQTT_CONNECT_FL_WILL))
goto not_found_or_invalid;
if (!mqtt_uint2str(trash, mpkt.data.connect.payload.will_props.payload_format_indicator))
goto not_found_or_invalid;
res = ist2(trash->area, trash->data);
goto end;
case MQTT_FN_MESSAGE_EXPIRY_INTERVAL:
if ((mpkt.data.connect.var_hdr.protocol_version != MQTT_VERSION_5_0) ||
!(mpkt.data.connect.var_hdr.flags & MQTT_CONNECT_FL_WILL))
goto not_found_or_invalid;
if (!mqtt_uint2str(trash, mpkt.data.connect.payload.will_props.message_expiry_interval))
goto not_found_or_invalid;
res = ist2(trash->area, trash->data);
goto end;
case MQTT_FN_CONTENT_TYPE:
if ((mpkt.data.connect.var_hdr.protocol_version != MQTT_VERSION_5_0) ||
!(mpkt.data.connect.var_hdr.flags & MQTT_CONNECT_FL_WILL))
goto not_found_or_invalid;
if (!istlen(mpkt.data.connect.payload.will_props.content_type))
goto not_found_or_invalid;
res = mpkt.data.connect.payload.will_props.content_type;
goto end;
case MQTT_FN_RESPONSE_TOPIC:
if ((mpkt.data.connect.var_hdr.protocol_version != MQTT_VERSION_5_0) ||
!(mpkt.data.connect.var_hdr.flags & MQTT_CONNECT_FL_WILL))
goto not_found_or_invalid;
if (!istlen(mpkt.data.connect.payload.will_props.response_topic))
goto not_found_or_invalid;
res = mpkt.data.connect.payload.will_props.response_topic;
goto end;
case MQTT_FN_CORRELATION_DATA:
if ((mpkt.data.connect.var_hdr.protocol_version != MQTT_VERSION_5_0) ||
!(mpkt.data.connect.var_hdr.flags & MQTT_CONNECT_FL_WILL))
goto not_found_or_invalid;
if (!istlen(mpkt.data.connect.payload.will_props.correlation_data))
goto not_found_or_invalid;
res = mpkt.data.connect.payload.will_props.correlation_data;
goto end;
case MQTT_FN_SESSION_EXPIRY_INTERVAL:
if (mpkt.data.connect.var_hdr.protocol_version != MQTT_VERSION_5_0)
goto not_found_or_invalid;
if (!mqtt_uint2str(trash, mpkt.data.connect.var_hdr.props.session_expiry_interval))
goto not_found_or_invalid;
res = ist2(trash->area, trash->data);
goto end;
case MQTT_FN_AUTHENTICATION_METHOD:
if (mpkt.data.connect.var_hdr.protocol_version != MQTT_VERSION_5_0)
goto not_found_or_invalid;
if (!istlen(mpkt.data.connect.var_hdr.props.authentication_method))
goto not_found_or_invalid;
res = mpkt.data.connect.var_hdr.props.authentication_method;
goto end;
case MQTT_FN_AUTHENTICATION_DATA:
if (mpkt.data.connect.var_hdr.protocol_version != MQTT_VERSION_5_0)
goto not_found_or_invalid;
if (!istlen(mpkt.data.connect.var_hdr.props.authentication_data))
goto not_found_or_invalid;
res = mpkt.data.connect.var_hdr.props.authentication_data;
goto end;
case MQTT_FN_REQUEST_PROBLEM_INFORMATION:
if (mpkt.data.connect.var_hdr.protocol_version != MQTT_VERSION_5_0)
goto not_found_or_invalid;
if (!mqtt_uint2str(trash, mpkt.data.connect.var_hdr.props.request_problem_information))
goto not_found_or_invalid;
res = ist2(trash->area, trash->data);
goto end;
case MQTT_FN_DELAY_INTERVAL:
if ((mpkt.data.connect.var_hdr.protocol_version != MQTT_VERSION_5_0) ||
!(mpkt.data.connect.var_hdr.flags & MQTT_CONNECT_FL_WILL))
goto not_found_or_invalid;
if (!mqtt_uint2str(trash, mpkt.data.connect.payload.will_props.delay_interval))
goto not_found_or_invalid;
res = ist2(trash->area, trash->data);
goto end;
case MQTT_FN_REQUEST_RESPONSE_INFORMATION:
if (mpkt.data.connect.var_hdr.protocol_version != MQTT_VERSION_5_0)
goto not_found_or_invalid;
if (!mqtt_uint2str(trash, mpkt.data.connect.var_hdr.props.request_response_information))
goto not_found_or_invalid;
res = ist2(trash->area, trash->data);
goto end;
case MQTT_FN_RECEIVE_MAXIMUM:
if (mpkt.data.connect.var_hdr.protocol_version != MQTT_VERSION_5_0)
goto not_found_or_invalid;
if (!mqtt_uint2str(trash, mpkt.data.connect.var_hdr.props.receive_maximum))
goto not_found_or_invalid;
res = ist2(trash->area, trash->data);
goto end;
case MQTT_FN_TOPIC_ALIAS_MAXIMUM:
if (mpkt.data.connect.var_hdr.protocol_version != MQTT_VERSION_5_0)
goto not_found_or_invalid;
if (!mqtt_uint2str(trash, mpkt.data.connect.var_hdr.props.topic_alias_maximum))
goto not_found_or_invalid;
res = ist2(trash->area, trash->data);
goto end;
case MQTT_FN_MAXIMUM_PACKET_SIZE:
if (mpkt.data.connect.var_hdr.protocol_version != MQTT_VERSION_5_0)
goto not_found_or_invalid;
if (!mqtt_uint2str(trash, mpkt.data.connect.var_hdr.props.maximum_packet_size))
goto not_found_or_invalid;
res = ist2(trash->area, trash->data);
goto end;
default:
goto not_found_or_invalid;
}
break;
case MQTT_CPT_CONNACK:
switch (fieldname_id) {
case MQTT_FN_FLAGS:
if (!mqtt_uint2str(trash, mpkt.data.connack.var_hdr.flags))
goto not_found_or_invalid;
res = ist2(trash->area, trash->data);
goto end;
case MQTT_FN_REASON_CODE:
if (!mqtt_uint2str(trash, mpkt.data.connack.var_hdr.reason_code))
goto not_found_or_invalid;
res = ist2(trash->area, trash->data);
goto end;
case MQTT_FN_PROTOCOL_VERSION:
if (!mqtt_uint2str(trash, mpkt.data.connack.var_hdr.protocol_version))
goto not_found_or_invalid;
res = ist2(trash->area, trash->data);
goto end;
case MQTT_FN_SESSION_EXPIRY_INTERVAL:
if (mpkt.data.connack.var_hdr.protocol_version != MQTT_VERSION_5_0)
goto not_found_or_invalid;
if (!mqtt_uint2str(trash, mpkt.data.connack.var_hdr.props.session_expiry_interval))
goto not_found_or_invalid;
res = ist2(trash->area, trash->data);
goto end;
case MQTT_FN_ASSIGNED_CLIENT_IDENTIFIER:
if (mpkt.data.connack.var_hdr.protocol_version != MQTT_VERSION_5_0)
goto not_found_or_invalid;
if (!istlen(mpkt.data.connack.var_hdr.props.assigned_client_identifier))
goto not_found_or_invalid;
res = mpkt.data.connack.var_hdr.props.assigned_client_identifier;
goto end;
case MQTT_FN_SERVER_KEEPALIVE:
if (mpkt.data.connack.var_hdr.protocol_version != MQTT_VERSION_5_0)
goto not_found_or_invalid;
if (!mqtt_uint2str(trash, mpkt.data.connack.var_hdr.props.server_keepalive))
goto not_found_or_invalid;
res = ist2(trash->area, trash->data);
goto end;
case MQTT_FN_AUTHENTICATION_METHOD:
if (mpkt.data.connack.var_hdr.protocol_version != MQTT_VERSION_5_0)
goto not_found_or_invalid;
if (!istlen(mpkt.data.connack.var_hdr.props.authentication_method))
goto not_found_or_invalid;
res = mpkt.data.connack.var_hdr.props.authentication_method;
goto end;
case MQTT_FN_AUTHENTICATION_DATA:
if (mpkt.data.connack.var_hdr.protocol_version != MQTT_VERSION_5_0)
goto not_found_or_invalid;
if (!istlen(mpkt.data.connack.var_hdr.props.authentication_data))
goto not_found_or_invalid;
res = mpkt.data.connack.var_hdr.props.authentication_data;
goto end;
case MQTT_FN_RESPONSE_INFORMATION:
if (mpkt.data.connack.var_hdr.protocol_version != MQTT_VERSION_5_0)
goto not_found_or_invalid;
if (!istlen(mpkt.data.connack.var_hdr.props.response_information))
goto not_found_or_invalid;
res = mpkt.data.connack.var_hdr.props.response_information;
goto end;
case MQTT_FN_SERVER_REFERENCE:
if (mpkt.data.connack.var_hdr.protocol_version != MQTT_VERSION_5_0)
goto not_found_or_invalid;
if (!istlen(mpkt.data.connack.var_hdr.props.server_reference))
goto not_found_or_invalid;
res = mpkt.data.connack.var_hdr.props.server_reference;
goto end;
case MQTT_FN_REASON_STRING:
if (mpkt.data.connack.var_hdr.protocol_version != MQTT_VERSION_5_0)
goto not_found_or_invalid;
if (!istlen(mpkt.data.connack.var_hdr.props.reason_string))
goto not_found_or_invalid;
res = mpkt.data.connack.var_hdr.props.reason_string;
goto end;
case MQTT_FN_RECEIVE_MAXIMUM:
if (mpkt.data.connack.var_hdr.protocol_version != MQTT_VERSION_5_0)
goto not_found_or_invalid;
if (!mqtt_uint2str(trash, mpkt.data.connack.var_hdr.props.receive_maximum))
goto not_found_or_invalid;
res = ist2(trash->area, trash->data);
goto end;
case MQTT_FN_TOPIC_ALIAS_MAXIMUM:
if (mpkt.data.connack.var_hdr.protocol_version != MQTT_VERSION_5_0)
goto not_found_or_invalid;
if (!mqtt_uint2str(trash, mpkt.data.connack.var_hdr.props.topic_alias_maximum))
goto not_found_or_invalid;
res = ist2(trash->area, trash->data);
goto end;
case MQTT_FN_MAXIMUM_QOS:
if (mpkt.data.connack.var_hdr.protocol_version != MQTT_VERSION_5_0)
goto not_found_or_invalid;
if (!mqtt_uint2str(trash, mpkt.data.connack.var_hdr.props.maximum_qos))
goto not_found_or_invalid;
res = ist2(trash->area, trash->data);
goto end;
case MQTT_FN_RETAIN_AVAILABLE:
if (mpkt.data.connack.var_hdr.protocol_version != MQTT_VERSION_5_0)
goto not_found_or_invalid;
if (!mqtt_uint2str(trash, mpkt.data.connack.var_hdr.props.retain_available))
goto not_found_or_invalid;
res = ist2(trash->area, trash->data);
goto end;
case MQTT_FN_MAXIMUM_PACKET_SIZE:
if (mpkt.data.connack.var_hdr.protocol_version != MQTT_VERSION_5_0)
goto not_found_or_invalid;
if (!mqtt_uint2str(trash, mpkt.data.connack.var_hdr.props.maximum_packet_size))
goto not_found_or_invalid;
res = ist2(trash->area, trash->data);
goto end;
case MQTT_FN_WILDCARD_SUBSCRIPTION_AVAILABLE:
if (mpkt.data.connack.var_hdr.protocol_version != MQTT_VERSION_5_0)
goto not_found_or_invalid;
if (!mqtt_uint2str(trash, mpkt.data.connack.var_hdr.props.wildcard_subscription_available))
goto not_found_or_invalid;
res = ist2(trash->area, trash->data);
goto end;
case MQTT_FN_SUBSCRIPTION_IDENTIFIERS_AVAILABLE:
if (mpkt.data.connack.var_hdr.protocol_version != MQTT_VERSION_5_0)
goto not_found_or_invalid;
if (!mqtt_uint2str(trash, mpkt.data.connack.var_hdr.props.subscription_identifiers_available))
goto not_found_or_invalid;
res = ist2(trash->area, trash->data);
goto end;
case MQTT_FN_SHARED_SUBSCRIPTION_AVAILABLE:
if (mpkt.data.connack.var_hdr.protocol_version != MQTT_VERSION_5_0)
goto not_found_or_invalid;
if (!mqtt_uint2str(trash, mpkt.data.connack.var_hdr.props.shared_subsription_available))
goto not_found_or_invalid;
res = ist2(trash->area, trash->data);
goto end;
default:
goto not_found_or_invalid;
}
break;
default:
goto not_found_or_invalid;
}
end:
return res;
need_more:
return ist2(istptr(msg), 0);
not_found_or_invalid:
return IST_NULL;
}
/* Parses a CONNECT packet :
* https://public.dhe.ibm.com/software/dw/webservices/ws-mqtt/mqtt-v3r1.html#connect
* https://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html#_Toc398718028
* https://docs.oasis-open.org/mqtt/mqtt/v5.0/os/mqtt-v5.0-os.html#_Toc3901033
*
* <parser> should point right after the MQTT fixed header. The remaining length
* was already checked, thus missing data is an error. On success, the result of
* the parsing is stored in <mpkt>.
*
* Returns:
* MQTT_INVALID_MESSAGE if the CONNECT message is invalid
* MQTT_VALID_MESSAGE if the CONNECT message looks valid
*/
static int mqtt_parse_connect(struct ist parser, struct mqtt_pkt *mpkt)
{
/* The parser length is stored to be sure exactly consumed the announced
* remaining length. */
size_t orig_len = istlen(parser);
int ret = MQTT_INVALID_MESSAGE;
/*
* parsing variable header
*/
/* read protocol_name */
parser = mqtt_read_string(parser, &mpkt->data.connect.var_hdr.protocol_name);
if (!isttest(parser) || !(isteqi(mpkt->data.connect.var_hdr.protocol_name, ist("MQTT")) || isteqi(mpkt->data.connect.var_hdr.protocol_name, ist("MQIsdp"))))
goto end;
/* read protocol_version */
parser = mqtt_read_1byte_int(parser, &mpkt->data.connect.var_hdr.protocol_version);
if (!isttest(parser))
goto end;
if (mpkt->data.connect.var_hdr.protocol_version != MQTT_VERSION_3_1 &&
mpkt->data.connect.var_hdr.protocol_version != MQTT_VERSION_3_1_1 &&
mpkt->data.connect.var_hdr.protocol_version != MQTT_VERSION_5_0)
goto end;
/* read flags */
/* bit 1 is 'reserved' and must be set to 0 in CONNECT message flags */
parser = mqtt_read_1byte_int(parser, &mpkt->data.connect.var_hdr.flags);
if (!isttest(parser) || (mpkt->data.connect.var_hdr.flags & MQTT_CONNECT_FL_RESERVED))
goto end;
/* if WILL flag must be set to have WILL_QOS flag or WILL_RETAIN set */
if ((mpkt->data.connect.var_hdr.flags & (MQTT_CONNECT_FL_WILL|MQTT_CONNECT_FL_WILL_QOS|MQTT_CONNECT_FL_WILL_RETAIN)) == MQTT_CONNECT_FL_WILL_QOS)
goto end;
/* read keepalive */
parser = mqtt_read_2byte_int(parser, &mpkt->data.connect.var_hdr.keepalive);
if (!isttest(parser))
goto end;
/* read properties, only available in MQTT_VERSION_5_0 */
if (mpkt->data.connect.var_hdr.protocol_version == MQTT_VERSION_5_0) {
struct ist props;
unsigned int user_prop_idx = 0;
uint64_t fields = 0;
uint32_t plen = 0;
parser = mqtt_read_varint(parser, &plen);
if (!isttest(parser) || istlen(parser) < plen)
goto end;
props = ist2(istptr(parser), plen);
parser = istadv(parser, props.len);
while (istlen(props) > 0) {
switch (*istptr(props)) {
case MQTT_PROP_SESSION_EXPIRY_INTERVAL:
if (fields & MQTT_FN_BIT_SESSION_EXPIRY_INTERVAL)
goto end;
props = mqtt_read_4byte_int(istnext(props), &mpkt->data.connect.var_hdr.props.session_expiry_interval);
fields |= MQTT_FN_BIT_SESSION_EXPIRY_INTERVAL;
break;
case MQTT_PROP_RECEIVE_MAXIMUM:
if (fields & MQTT_FN_BIT_RECEIVE_MAXIMUM)
goto end;
props = mqtt_read_2byte_int(istnext(props), &mpkt->data.connect.var_hdr.props.receive_maximum);
/* cannot be 0 */
if (!mpkt->data.connect.var_hdr.props.receive_maximum)
goto end;
fields |= MQTT_FN_BIT_RECEIVE_MAXIMUM;
break;
case MQTT_PROP_MAXIMUM_PACKET_SIZE:
if (fields & MQTT_FN_BIT_MAXIMUM_PACKET_SIZE)
goto end;
props = mqtt_read_4byte_int(istnext(props), &mpkt->data.connect.var_hdr.props.maximum_packet_size);
/* cannot be 0 */
if (!mpkt->data.connect.var_hdr.props.maximum_packet_size)
goto end;
fields |= MQTT_FN_BIT_MAXIMUM_PACKET_SIZE;
break;
case MQTT_PROP_TOPIC_ALIAS_MAXIMUM:
if (fields & MQTT_FN_BIT_TOPIC_ALIAS)
goto end;
props = mqtt_read_2byte_int(istnext(props), &mpkt->data.connect.var_hdr.props.topic_alias_maximum);
fields |= MQTT_FN_BIT_TOPIC_ALIAS;
break;
case MQTT_PROP_REQUEST_RESPONSE_INFORMATION:
if (fields & MQTT_FN_BIT_REQUEST_RESPONSE_INFORMATION)
goto end;
props = mqtt_read_1byte_int(istnext(props), &mpkt->data.connect.var_hdr.props.request_response_information);
/* can have only 2 values: 0 or 1 */
if (mpkt->data.connect.var_hdr.props.request_response_information > 1)
goto end;
fields |= MQTT_FN_BIT_REQUEST_RESPONSE_INFORMATION;
break;
case MQTT_PROP_REQUEST_PROBLEM_INFORMATION:
if (fields & MQTT_FN_BIT_REQUEST_PROBLEM_INFORMATION)
goto end;
props = mqtt_read_1byte_int(istnext(props), &mpkt->data.connect.var_hdr.props.request_problem_information);
/* can have only 2 values: 0 or 1 */
if (mpkt->data.connect.var_hdr.props.request_problem_information > 1)
goto end;
fields |= MQTT_FN_BIT_REQUEST_PROBLEM_INFORMATION;
break;
case MQTT_PROP_USER_PROPERTIES:
/* if we reached MQTT_PROP_USER_PROPERTY_ENTRIES already, then
* we start writing over the first property */
if (user_prop_idx >= MQTT_PROP_USER_PROPERTY_ENTRIES)
user_prop_idx = 0;
/* read user property name and value */
props = mqtt_read_string(istnext(props), &mpkt->data.connect.var_hdr.props.user_props[user_prop_idx].name);
if (!isttest(props))
goto end;
props = mqtt_read_string(props, &mpkt->data.connect.var_hdr.props.user_props[user_prop_idx].value);
++user_prop_idx;
break;
case MQTT_PROP_AUTHENTICATION_METHOD:
if (fields & MQTT_FN_BIT_AUTHENTICATION_METHOD)
goto end;
props = mqtt_read_string(istnext(props), &mpkt->data.connect.var_hdr.props.authentication_method);
fields |= MQTT_FN_BIT_AUTHENTICATION_METHOD;
break;
case MQTT_PROP_AUTHENTICATION_DATA:
if (fields & MQTT_FN_BIT_AUTHENTICATION_DATA)
goto end;
props = mqtt_read_string(istnext(props), &mpkt->data.connect.var_hdr.props.authentication_data);
fields |= MQTT_FN_BIT_AUTHENTICATION_DATA;
break;
default:
goto end;
}
if (!isttest(props))
goto end;
}
}
/* cannot have auth data without auth method */
if (!istlen(mpkt->data.connect.var_hdr.props.authentication_method) &&
istlen(mpkt->data.connect.var_hdr.props.authentication_data))
goto end;
/* parsing payload
*
* Content of payload is related to flags parsed above and the field order is pre-defined:
* Client Identifier, Will Topic, Will Message, User Name, Password
*/
/* read client identifier */
parser = mqtt_read_string(parser, &mpkt->data.connect.payload.client_identifier);
if (!isttest(parser))
goto end;
/* read Will Properties, for MQTT v5 only
* https://docs.oasis-open.org/mqtt/mqtt/v5.0/os/mqtt-v5.0-os.html#_Toc3901060
*/
if ((mpkt->data.connect.var_hdr.protocol_version == MQTT_VERSION_5_0) &&
(mpkt->data.connect.var_hdr.flags & MQTT_CONNECT_FL_WILL)) {
struct ist props;
unsigned int user_prop_idx = 0;
uint64_t fields = 0;
uint32_t plen = 0;
parser = mqtt_read_varint(parser, &plen);
if (!isttest(parser) || istlen(parser) < plen)
goto end;
props = ist2(istptr(parser), plen);
parser = istadv(parser, props.len);
while (istlen(props) > 0) {
switch (*istptr(props)) {
case MQTT_PROP_WILL_DELAY_INTERVAL:
if (fields & MQTT_FN_BIT_DELAY_INTERVAL)
goto end;
props = mqtt_read_4byte_int(istnext(props), &mpkt->data.connect.payload.will_props.delay_interval);
fields |= MQTT_FN_BIT_DELAY_INTERVAL;
break;
case MQTT_PROP_PAYLOAD_FORMAT_INDICATOR:
if (fields & MQTT_FN_BIT_PAYLOAD_FORMAT_INDICATOR)
goto end;
props = mqtt_read_1byte_int(istnext(props), &mpkt->data.connect.payload.will_props.payload_format_indicator);
/* can have only 2 values: 0 or 1 */
if (mpkt->data.connect.payload.will_props.payload_format_indicator > 1)
goto end;
fields |= MQTT_FN_BIT_PAYLOAD_FORMAT_INDICATOR;
break;
case MQTT_PROP_MESSAGE_EXPIRY_INTERVAL:
if (fields & MQTT_FN_BIT_MESSAGE_EXPIRY_INTERVAL)
goto end;
props = mqtt_read_4byte_int(istnext(props), &mpkt->data.connect.payload.will_props.message_expiry_interval);
fields |= MQTT_FN_BIT_MESSAGE_EXPIRY_INTERVAL;
break;
case MQTT_PROP_CONTENT_TYPE:
if (fields & MQTT_FN_BIT_CONTENT_TYPE)
goto end;
props = mqtt_read_string(istnext(props), &mpkt->data.connect.payload.will_props.content_type);
fields |= MQTT_FN_BIT_CONTENT_TYPE;
break;
case MQTT_PROP_RESPONSE_TOPIC:
if (fields & MQTT_FN_BIT_RESPONSE_TOPIC)
goto end;
props = mqtt_read_string(istnext(props), &mpkt->data.connect.payload.will_props.response_topic);
fields |= MQTT_FN_BIT_RESPONSE_TOPIC;
break;
case MQTT_PROP_CORRELATION_DATA:
if (fields & MQTT_FN_BIT_CORRELATION_DATA)
goto end;
props = mqtt_read_string(istnext(props), &mpkt->data.connect.payload.will_props.correlation_data);
fields |= MQTT_FN_BIT_CORRELATION_DATA;
break;
case MQTT_PROP_USER_PROPERTIES:
/* if we reached MQTT_PROP_USER_PROPERTY_ENTRIES already, then
* we start writing over the first property */
if (user_prop_idx >= MQTT_PROP_USER_PROPERTY_ENTRIES)
user_prop_idx = 0;
/* read user property name and value */
props = mqtt_read_string(istnext(props), &mpkt->data.connect.payload.will_props.user_props[user_prop_idx].name);
if (!isttest(props))
goto end;
props = mqtt_read_string(props, &mpkt->data.connect.payload.will_props.user_props[user_prop_idx].value);
++user_prop_idx;
break;
default:
goto end;
}
if (!isttest(props))
goto end;
}
}
/* read Will Topic and Will Message (MQTT 3.1.1) or Payload (MQTT 5.0) */
if (mpkt->data.connect.var_hdr.flags & MQTT_CONNECT_FL_WILL) {
parser = mqtt_read_string(parser, &mpkt->data.connect.payload.will_topic);
if (!isttest(parser))
goto end;
parser = mqtt_read_string(parser, &mpkt->data.connect.payload.will_payload);
if (!isttest(parser))
goto end;
}
/* read User Name */
if (mpkt->data.connect.var_hdr.flags & MQTT_CONNECT_FL_USERNAME) {
parser = mqtt_read_string(parser, &mpkt->data.connect.payload.username);
if (!isttest(parser))
goto end;
}
/* read Password */
if (mpkt->data.connect.var_hdr.flags & MQTT_CONNECT_FL_PASSWORD) {
parser = mqtt_read_string(parser, &mpkt->data.connect.payload.password);
if (!isttest(parser))
goto end;
}
if ((orig_len - istlen(parser)) == mpkt->fixed_hdr.remaining_length)
ret = MQTT_VALID_MESSAGE;
end:
return ret;
}
/* Parses a CONNACK packet :
* https://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html#_Toc398718033
* https://docs.oasis-open.org/mqtt/mqtt/v5.0/os/mqtt-v5.0-os.html#_Toc3901074
*
* <parser> should point right after the MQTT fixed header. The remaining length
* was already checked, thus missing data is an error. On success, the result of
* the parsing is stored in <mpkt>.
*
* Returns:
* MQTT_INVALID_MESSAGE if the CONNECT message is invalid
* MQTT_VALID_MESSAGE if the CONNECT message looks valid
*/
static int mqtt_parse_connack(struct ist parser, struct mqtt_pkt *mpkt)
{