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packet-mqtt.c
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/* packet-mqtt.c
* Routines for MQTT Protocol dissection
*
* MQTT v5.0 support sponsored by 1byt3 <customers at 1byt3.com>
*
* By Lakshmi Narayana Madala <[email protected]>
* Stig Bjorlykke <[email protected]>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <[email protected]>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
/*
* Protocol description:
*
* MQTT is a Client Server publish/subscribe messaging transport
* protocol. The protocol runs over TCP/IP, or over other network
* protocols that provide ordered, lossless, bi-directional
* connections.
*
* MQTT v3.1 specification:
* http://public.dhe.ibm.com/software/dw/webservices/ws-mqtt/mqtt-v3r1.html
*
* MQTT v3.1.1 specification:
* http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/
*
* MQTT v5.0 specification:
* http://docs.oasis-open.org/mqtt/mqtt/v5.0/
*
*/
#include "config.h"
#include <epan/expert.h>
#include <epan/packet.h>
#include <epan/tfs.h>
#include <wsutil/array.h>
#include <epan/uat.h>
#include "packet-tcp.h"
#include "packet-tls.h"
#define MQTT_DEFAULT_PORT 1883 /* IANA registered under service name as mqtt */
#define MQTT_SSL_DEFAULT_PORT 8883 /* IANA registered under service name secure-mqtt */
/* MQTT Protocol Versions */
#define MQTT_PROTO_V31 3
#define MQTT_PROTO_V311 4
#define MQTT_PROTO_V50 5
#define MQTT_HDR_SIZE_BEFORE_LEN 1
/* MQTT Message Types */
#define MQTT_RESERVED 0
#define MQTT_CONNECT 1
#define MQTT_CONNACK 2
#define MQTT_PUBLISH 3
#define MQTT_PUBACK 4
#define MQTT_PUBREC 5
#define MQTT_PUBREL 6
#define MQTT_PUBCOMP 7
#define MQTT_SUBSCRIBE 8
#define MQTT_SUBACK 9
#define MQTT_UNSUBSCRIBE 10
#define MQTT_UNSUBACK 11
#define MQTT_PINGREQ 12
#define MQTT_PINGRESP 13
#define MQTT_DISCONNECT 14
#define MQTT_AUTH 15
#define MQTT_RESERVED_16 16
/* Flag Values to extract fields */
#define MQTT_MASK_MSG_TYPE 0xF0
#define MQTT_MASK_HDR_RESERVED 0x0F
#define MQTT_MASK_HDR_DUP_RESERVED 0x07
#define MQTT_MASK_QOS 0x06
#define MQTT_MASK_DUP_FLAG 0x08
#define MQTT_MASK_RETAIN 0x01
/* MQTT v5.0 Flag Values for the Subscription Options @ Subscribe Packet */
#define MQTT_MASK_SUBS_QOS 0x03
#define MQTT_MASK_SUBS_NL 0x04
#define MQTT_MASK_SUBS_RAP 0x08
#define MQTT_MASK_SUBS_RETAIN 0x30
#define MQTT_MASK_SUBS_RESERVED 0xC0
void proto_register_mqtt(void);
void proto_reg_handoff_mqtt(void);
static dissector_table_t media_type_dissector_table;
static const value_string mqtt_protocol_version_vals[] = {
{ MQTT_PROTO_V31, "MQTT v3.1" },
{ MQTT_PROTO_V311, "MQTT v3.1.1" },
{ MQTT_PROTO_V50, "MQTT v5.0" },
{ 0, NULL }
};
static const enum_val_t mqtt_protocol_version_enumvals[] = {
{ "none", "None", 0 },
{ "v31", "MQTT v3.1", MQTT_PROTO_V31 },
{ "v311", "MQTT v3.1.1", MQTT_PROTO_V311 },
{ "v50", "MQTT v5.0", MQTT_PROTO_V50 },
{ NULL, NULL, 0 }
};
static const value_string mqtt_msgtype_vals[] = {
{ MQTT_RESERVED, "Reserved" },
{ MQTT_CONNECT, "Connect Command" },
{ MQTT_CONNACK, "Connect Ack" },
{ MQTT_PUBLISH, "Publish Message" },
{ MQTT_PUBACK, "Publish Ack" },
{ MQTT_PUBREC, "Publish Received" },
{ MQTT_PUBREL, "Publish Release" },
{ MQTT_PUBCOMP, "Publish Complete" },
{ MQTT_SUBSCRIBE, "Subscribe Request" },
{ MQTT_SUBACK, "Subscribe Ack" },
{ MQTT_UNSUBSCRIBE, "Unsubscribe Request" },
{ MQTT_UNSUBACK, "Unsubscribe Ack" },
{ MQTT_PINGREQ, "Ping Request" },
{ MQTT_PINGRESP, "Ping Response" },
{ MQTT_DISCONNECT, "Disconnect Req" },
{ MQTT_AUTH, "Authentication Exchange" },
{ MQTT_RESERVED_16, "Reserved" },
{ 0, NULL }
};
static value_string_ext mqtt_msgtype_vals_ext = VALUE_STRING_EXT_INIT(mqtt_msgtype_vals);
#define MQTT_QOS_ATMOST_ONCE 0
#define MQTT_QOS_ATLEAST_ONCE 1
#define MQTT_QOS_EXACTLY_ONCE 2
#define MQTT_QOS_RESERVED 3
static const value_string mqtt_qos_vals[] = {
{ MQTT_QOS_ATMOST_ONCE, "At most once delivery (Fire and Forget)" },
{ MQTT_QOS_ATLEAST_ONCE, "At least once delivery (Acknowledged deliver)" },
{ MQTT_QOS_EXACTLY_ONCE, "Exactly once delivery (Assured Delivery)" },
{ MQTT_QOS_RESERVED, "Reserved" },
{ 0, NULL }
};
#define MQTT_SUBACK_FAILURE 128
static const value_string mqtt_subqos_vals[] = {
{ MQTT_QOS_ATMOST_ONCE, "At most once delivery (Fire and Forget)" },
{ MQTT_QOS_ATLEAST_ONCE, "At least once delivery (Acknowledged deliver)" },
{ MQTT_QOS_EXACTLY_ONCE, "Exactly once delivery (Assured Delivery)" },
{ MQTT_QOS_RESERVED, "Reserved" },
{ MQTT_SUBACK_FAILURE, "Failure" },
{ 0, NULL }
};
#define MQTT_CON_ACCEPTED 0
#define MQTT_CON_REFUSED_VERSION_MISMATCH 1
#define MQTT_CON_REFUSED_ID_REJECTED 2
#define MQTT_CON_REFUSED_SERVER_UNAVAILABLE 3
#define MQTT_CON_REFUSED_BAD_USER_PASSWD 4
#define MQTT_CON_REFUSED_UNAUTHORIZED 5
static const value_string mqtt_conack_vals[] = {
{ MQTT_CON_ACCEPTED, "Connection Accepted" },
{ MQTT_CON_REFUSED_VERSION_MISMATCH, "Connection Refused: unacceptable protocol version" },
{ MQTT_CON_REFUSED_ID_REJECTED, "Connection Refused: identifier rejected" },
{ MQTT_CON_REFUSED_SERVER_UNAVAILABLE, "Connection Refused: server unavailable" },
{ MQTT_CON_REFUSED_BAD_USER_PASSWD, "Connection Refused: bad user name or password" },
{ MQTT_CON_REFUSED_UNAUTHORIZED, "Connection Refused: not authorized" },
{ 0, NULL }
};
#define MQTT_CONMASK_USER 0x80
#define MQTT_CONMASK_PASSWD 0x40
#define MQTT_CONMASK_RETAIN 0x20
#define MQTT_CONMASK_QOS 0x18
#define MQTT_CONMASK_WILLFLAG 0x04
#define MQTT_CONMASK_CLEANSESS 0x02
#define MQTT_CONMASK_RESERVED 0x01
#define MQTT_CONACKMASK_RESERVED 0xFE
#define MQTT_CONACKMASK_SP 0x01
/* The protocol version is present in the CONNECT message. */
typedef struct {
uint8_t runtime_proto_version;
wmem_map_t *topic_alias_map;
} mqtt_conv_t;
typedef struct _mqtt_message_decode_t {
unsigned match_criteria;
char *topic_pattern;
GRegex *topic_regex;
unsigned msg_decoding;
char *payload_proto_name;
dissector_handle_t payload_proto;
} mqtt_message_decode_t;
typedef struct _mqtt_properties_t {
const uint8_t *content_type;
uint32_t topic_alias;
} mqtt_properties_t;
#define MATCH_CRITERIA_EQUAL 0
#define MATCH_CRITERIA_CONTAINS 1
#define MATCH_CRITERIA_STARTS_WITH 2
#define MATCH_CRITERIA_ENDS_WITH 3
#define MATCH_CRITERIA_REGEX 4
static const value_string match_criteria[] = {
{ MATCH_CRITERIA_EQUAL, "Equal to" },
{ MATCH_CRITERIA_CONTAINS, "Contains" },
{ MATCH_CRITERIA_STARTS_WITH, "Starts with" },
{ MATCH_CRITERIA_ENDS_WITH, "Ends with" },
{ MATCH_CRITERIA_REGEX, "Regular Expression" },
{ 0, NULL }
};
#define MSG_DECODING_NONE 0
#define MSG_DECODING_COMPRESSED 1
static const value_string msg_decoding[] = {
{ MSG_DECODING_NONE, "none" },
{ MSG_DECODING_COMPRESSED, "compressed" },
{ 0, NULL }
};
#define PROP_PAYLOAD_FORMAT_INDICATOR 0x01
#define PROP_PUBLICATION_EXPIRY_INTERVAL 0x02
#define PROP_CONTENT_TYPE 0x03
#define PROP_RESPONSE_TOPIC 0x08
#define PROP_CORRELATION_DATA 0x09
#define PROP_SUBSCRIPTION_IDENTIFIER 0x0B
#define PROP_SESSION_EXPIRY_INTERVAL 0x11
#define PROP_ASSIGNED_CLIENT_IDENTIFIER 0x12
#define PROP_SERVER_KEEP_ALIVE 0x13
#define PROP_AUTH_METHOD 0x15
#define PROP_AUTH_DATA 0x16
#define PROP_REQUEST_PROBLEM_INFORMATION 0x17
#define PROP_WILL_DELAY_INTERVAL 0x18
#define PROP_REQUEST_RESPONSE_INFORMATION 0x19
#define PROP_RESPONSE_INFORMATION 0x1A
#define PROP_SERVER_REFERENCE 0x1C
#define PROP_REASON_STRING 0x1F
#define PROP_RECEIVE_MAXIMUM 0x21
#define PROP_TOPIC_ALIAS_MAXIMUM 0x22
#define PROP_TOPIC_ALIAS 0x23
#define PROP_MAXIMUM_QOS 0x24
#define PROP_RETAIN_AVAILABLE 0x25
#define PROP_USER_PROPERTY 0x26
#define PROP_MAXIMUM_PACKET_SIZE 0x27
#define PROP_WILDCARD_SUBSCRIPTION_AVAILABLE 0x28
#define PROP_SUBSCRIPTION_IDENTIFIER_AVAILABLE 0x29
#define PROP_SHARED_SUBSCRIPTION_AVAILABLE 0x2A
static const value_string mqtt_property_vals[] = {
{ PROP_PAYLOAD_FORMAT_INDICATOR, "Payload Format Indicator" },
{ PROP_PUBLICATION_EXPIRY_INTERVAL, "Publication Expiry Interval" },
{ PROP_CONTENT_TYPE, "Content Type" },
{ PROP_RESPONSE_TOPIC, "Response Topic" },
{ PROP_CORRELATION_DATA, "Correlation Data" },
{ PROP_SUBSCRIPTION_IDENTIFIER, "Subscription Identifier" },
{ PROP_SESSION_EXPIRY_INTERVAL, "Session Expiry Interval" },
{ PROP_ASSIGNED_CLIENT_IDENTIFIER, "Assigned Client Identifier" },
{ PROP_SERVER_KEEP_ALIVE, "Server Keep Alive" },
{ PROP_AUTH_METHOD, "Authentication Method" },
{ PROP_AUTH_DATA, "Authentication Data" },
{ PROP_REQUEST_PROBLEM_INFORMATION, "Request Problem Information" },
{ PROP_WILL_DELAY_INTERVAL, "Will Delay Interval" },
{ PROP_REQUEST_RESPONSE_INFORMATION, "Request Response Information" },
{ PROP_RESPONSE_INFORMATION, "Response Information" },
{ PROP_SERVER_REFERENCE, "Server Reference" },
{ PROP_REASON_STRING, "Reason String" },
{ PROP_RECEIVE_MAXIMUM, "Receive Maximum" },
{ PROP_TOPIC_ALIAS_MAXIMUM, "Topic Alias Maximum" },
{ PROP_TOPIC_ALIAS, "Topic Alias" },
{ PROP_MAXIMUM_QOS, "Maximum QoS" },
{ PROP_RETAIN_AVAILABLE, "Retain Available" },
{ PROP_USER_PROPERTY, "User Property" },
{ PROP_MAXIMUM_PACKET_SIZE, "Maximum Packet Size" },
{ PROP_WILDCARD_SUBSCRIPTION_AVAILABLE, "Wildcard Subscription Available" },
{ PROP_SUBSCRIPTION_IDENTIFIER_AVAILABLE, "Subscription Identifier Available" },
{ PROP_SHARED_SUBSCRIPTION_AVAILABLE, "Shared Subscription Available" },
{ 0, NULL }
};
/* MQTT v5.0 Subscription Options, Retain Handling option */
#define SUBSCRIPTION_RETAIN_SEND 0x00
#define SUBSCRIPTION_RETAIN_SEND_DONT_EXIST 0x01
#define SUBSCRIPTION_RETAIN_DONT_SEND 0x02
#define SUBSCRIPTION_RETAIN_RESERVED 0x03
static const value_string mqtt_subscription_retain_handling[] = {
{ SUBSCRIPTION_RETAIN_SEND, "Send msgs at subscription time" },
{ SUBSCRIPTION_RETAIN_SEND_DONT_EXIST, "Send msgs if subscription does not exist" },
{ SUBSCRIPTION_RETAIN_DONT_SEND, "Do not send msgs at subscription time" },
{ SUBSCRIPTION_RETAIN_RESERVED, "Reserved" },
{ 0, NULL }
};
/* MQTT v5.0 Reason Codes */
#define RC_SUCCESS 0x00
#define RC_NORMAL_DISCONNECTION 0x00
#define RC_GRANTED_QOS0 0x00
#define RC_GRANTED_QOS1 0x01
#define RC_GRANTED_QOS2 0x02
#define RC_DISCONNECT_WILL 0x04
#define RC_NO_MATCHING_SUBSCRIBERS 0x10
#define RC_NO_SUBSCRIPTION_EXISTED 0x11
#define RC_CONTINUE_AUTHENTICATION 0x18
#define RC_RE_AUTHENTICATE 0x19
#define RC_UNSPECIFIED_ERROR 0x80
#define RC_MALFORMED_PACKET 0x81
#define RC_PROTOCOL_ERROR 0x82
#define RC_IMPLEMENTATION_SPECIFIC_ERROR 0x83
#define RC_UNSUPPORTED_PROTOCOL_VERSION 0x84
#define RC_CLIENT_IDENTIFIER_NOT_VALID 0x85
#define RC_BAD_USER_NAME_OR_PASSWORD 0x86
#define RC_NOT_AUTHORIZED 0x87
#define RC_SERVER_UNAVAILABLE 0x88
#define RC_SERVER_BUSY 0x89
#define RC_BANNED 0x8A
#define RC_SERVER_SHUTTING_DOWN 0x8B
#define RC_BAD_AUTHENTICATION_METHOD 0x8C
#define RC_KEEP_ALIVE_TIMEOUT 0x8D
#define RC_SESSION_TAKEN_OVER 0x8E
#define RC_TOPIC_FILTER_INVALID 0x8F
#define RC_TOPIC_NAME_INVALID 0x90
#define RC_PACKET_IDENTIFIER_IN_USE 0x91
#define RC_PACKET_IDENTIFIER_NOT_FOUND 0x92
#define RC_RECEIVE_MAXIMUM_EXCEEDED 0x93
#define RC_TOPIC_ALIAS_INVALID 0x94
#define RC_PACKET_TOO_LARGE 0x95
#define RC_MESSAGE_RATE_TOO_HIGH 0x96
#define RC_QUOTA_EXCEEDED 0x97
#define RC_ADMINISTRATIVE_ACTION 0x98
#define RC_PAYLOAD_FORMAT_INVALID 0x99
#define RC_RETAIN_NOT_SUPPORTED 0x9A
#define RC_QOS_NOT_SUPPORTED 0x9B
#define RC_USE_ANOTHER_SERVER 0x9C
#define RC_SERVER_MOVED 0x9D
#define RC_SHARED_SUBSCRIPTION_NOT_SUPPORTED 0x9E
#define RC_CONNECTION_RATE_EXCEEDED 0x9F
#define RC_MAXIMUM_CONNECT_TIME 0xA0
#define RC_SUBSCRIPTION_IDENTIFIERS_NOT_SUPPORTED 0xA1
#define RC_WILDCARD_SUBSCRIPTION_NOT_SUPPORTED 0xA2
#define RC_SUCCESS_STR "Success"
#define RC_NORMAL_DISCONNECTION_STR "Normal disconnection"
#define RC_GRANTED_QOS0_STR "Granted QoS 0"
#define RC_GRANTED_QOS1_STR "Granted QoS 1"
#define RC_GRANTED_QOS2_STR "Granted QoS 2"
#define RC_DISCONNECT_WILL_STR "Disconnect with Will Message"
#define RC_NO_MATCHING_SUBSCRIBERS_STR "No matching subscribers"
#define RC_NO_SUBSCRIPTION_EXISTED_STR "No subscription existed"
#define RC_CONTINUE_AUTHENTICATION_STR "Continue authentication"
#define RC_RE_AUTHENTICATE_STR "Re-authenticate"
#define RC_UNSPECIFIED_ERROR_STR "Unspecified error"
#define RC_MALFORMED_PACKET_STR "Malformed Packet"
#define RC_PROTOCOL_ERROR_STR "Protocol Error"
#define RC_IMPLEMENTATION_SPECIFIC_ERROR_STR "Implementation specific error"
#define RC_UNSUPPORTED_PROTOCOL_VERSION_STR "Unsupported Protocol Version"
#define RC_CLIENT_IDENTIFIER_NOT_VALID_STR "Client Identifier not valid"
#define RC_BAD_USER_NAME_OR_PASSWORD_STR "Bad User Name or Password"
#define RC_NOT_AUTHORIZED_STR "Not authorized"
#define RC_SERVER_UNAVAILABLE_STR "Server unavailable"
#define RC_SERVER_BUSY_STR "Server busy"
#define RC_BANNED_STR "Banned"
#define RC_SERVER_SHUTTING_DOWN_STR "Server shutting down"
#define RC_BAD_AUTHENTICATION_METHOD_STR "Bad authentication method"
#define RC_KEEP_ALIVE_TIMEOUT_STR "Keep Alive timeout"
#define RC_SESSION_TAKEN_OVER_STR "Session taken over"
#define RC_TOPIC_FILTER_INVALID_STR "Topic Filter invalid"
#define RC_TOPIC_NAME_INVALID_STR "Topic Name invalid"
#define RC_PACKET_IDENTIFIER_IN_USE_STR "Packet Identifier in use"
#define RC_PACKET_IDENTIFIER_NOT_FOUND_STR "Packet Identifier not found"
#define RC_RECEIVE_MAXIMUM_EXCEEDED_STR "Receive Maximum exceeded"
#define RC_TOPIC_ALIAS_INVALID_STR "Topic Alias invalid"
#define RC_PACKET_TOO_LARGE_STR "Packet too large"
#define RC_MESSAGE_RATE_TOO_HIGH_STR "Message rate too high"
#define RC_QUOTA_EXCEEDED_STR "Quota exceeded"
#define RC_ADMINISTRATIVE_ACTION_STR "Administrative action"
#define RC_PAYLOAD_FORMAT_INVALID_STR "Payload format invalid"
#define RC_RETAIN_NOT_SUPPORTED_STR "Retain not supported"
#define RC_QOS_NOT_SUPPORTED_STR "QoS not supported"
#define RC_USE_ANOTHER_SERVER_STR "Use another server"
#define RC_SERVER_MOVED_STR "Server moved"
#define RC_SHARED_SUBSCRIPTION_NOT_SUPPORTED_STR "Shared Subscription not supported"
#define RC_CONNECTION_RATE_EXCEEDED_STR "Connection rate exceeded"
#define RC_MAXIMUM_CONNECT_TIME_STR "Maximum connect time"
#define RC_SUBSCRIPTION_IDENTIFIERS_NOT_SUPPORTED_STR "Subscription Identifiers not supported"
#define RC_WILDCARD_SUBSCRIPTION_NOT_SUPPORTED_STR "Wildcard Subscription not supported"
static const value_string mqtt_reason_code_connack_vals[] = {
{ RC_SUCCESS, RC_SUCCESS_STR },
{ RC_UNSPECIFIED_ERROR, RC_UNSPECIFIED_ERROR_STR },
{ RC_MALFORMED_PACKET, RC_MALFORMED_PACKET_STR },
{ RC_PROTOCOL_ERROR, RC_PROTOCOL_ERROR_STR },
{ RC_IMPLEMENTATION_SPECIFIC_ERROR, RC_IMPLEMENTATION_SPECIFIC_ERROR_STR },
{ RC_UNSUPPORTED_PROTOCOL_VERSION, RC_UNSUPPORTED_PROTOCOL_VERSION_STR },
{ RC_CLIENT_IDENTIFIER_NOT_VALID, RC_CLIENT_IDENTIFIER_NOT_VALID_STR },
{ RC_BAD_USER_NAME_OR_PASSWORD, RC_BAD_USER_NAME_OR_PASSWORD_STR },
{ RC_NOT_AUTHORIZED, RC_NOT_AUTHORIZED_STR },
{ RC_SERVER_UNAVAILABLE, RC_SERVER_UNAVAILABLE_STR },
{ RC_SERVER_BUSY, RC_SERVER_BUSY_STR },
{ RC_BANNED, RC_BANNED_STR },
{ RC_BAD_AUTHENTICATION_METHOD, RC_BAD_AUTHENTICATION_METHOD_STR },
{ RC_TOPIC_NAME_INVALID, RC_TOPIC_NAME_INVALID_STR },
{ RC_PACKET_TOO_LARGE, RC_PACKET_TOO_LARGE_STR },
{ RC_QUOTA_EXCEEDED, RC_QUOTA_EXCEEDED_STR },
{ RC_RETAIN_NOT_SUPPORTED, RC_RETAIN_NOT_SUPPORTED_STR },
{ RC_QOS_NOT_SUPPORTED, RC_QOS_NOT_SUPPORTED_STR },
{ RC_USE_ANOTHER_SERVER, RC_USE_ANOTHER_SERVER_STR },
{ RC_SERVER_MOVED, RC_SERVER_MOVED_STR },
{ RC_CONNECTION_RATE_EXCEEDED, RC_CONNECTION_RATE_EXCEEDED_STR },
{ 0, NULL }
};
static const value_string mqtt_reason_code_puback_vals[] = {
{ RC_SUCCESS, RC_SUCCESS_STR },
{ RC_NO_MATCHING_SUBSCRIBERS, RC_NO_MATCHING_SUBSCRIBERS_STR },
{ RC_UNSPECIFIED_ERROR, RC_UNSPECIFIED_ERROR_STR },
{ RC_IMPLEMENTATION_SPECIFIC_ERROR, RC_IMPLEMENTATION_SPECIFIC_ERROR_STR },
{ RC_NOT_AUTHORIZED, RC_NOT_AUTHORIZED_STR },
{ RC_TOPIC_NAME_INVALID, RC_TOPIC_NAME_INVALID_STR },
{ RC_PACKET_IDENTIFIER_IN_USE, RC_PACKET_IDENTIFIER_IN_USE_STR },
{ RC_QUOTA_EXCEEDED, RC_QUOTA_EXCEEDED_STR },
{ RC_PAYLOAD_FORMAT_INVALID, RC_PAYLOAD_FORMAT_INVALID_STR },
{ 0, NULL }
};
static const value_string mqtt_reason_code_pubrel_vals[] = {
{ RC_SUCCESS, RC_SUCCESS_STR },
{ RC_PACKET_IDENTIFIER_NOT_FOUND, RC_PACKET_IDENTIFIER_NOT_FOUND_STR },
{ 0, NULL }
};
static const value_string mqtt_reason_code_suback_vals[] = {
{ RC_GRANTED_QOS0, RC_GRANTED_QOS0_STR },
{ RC_GRANTED_QOS1, RC_GRANTED_QOS1_STR },
{ RC_GRANTED_QOS2, RC_GRANTED_QOS2_STR },
{ RC_UNSPECIFIED_ERROR, RC_UNSPECIFIED_ERROR_STR },
{ RC_IMPLEMENTATION_SPECIFIC_ERROR, RC_IMPLEMENTATION_SPECIFIC_ERROR_STR },
{ RC_NOT_AUTHORIZED, RC_NOT_AUTHORIZED_STR },
{ RC_TOPIC_FILTER_INVALID, RC_TOPIC_FILTER_INVALID_STR },
{ RC_PACKET_IDENTIFIER_IN_USE, RC_PACKET_IDENTIFIER_IN_USE_STR },
{ RC_QUOTA_EXCEEDED, RC_QUOTA_EXCEEDED_STR },
{ RC_SHARED_SUBSCRIPTION_NOT_SUPPORTED, RC_SHARED_SUBSCRIPTION_NOT_SUPPORTED_STR },
{ RC_SUBSCRIPTION_IDENTIFIERS_NOT_SUPPORTED, RC_SUBSCRIPTION_IDENTIFIERS_NOT_SUPPORTED_STR },
{ RC_WILDCARD_SUBSCRIPTION_NOT_SUPPORTED, RC_WILDCARD_SUBSCRIPTION_NOT_SUPPORTED_STR },
{ 0, NULL }
};
static const value_string mqtt_reason_code_unsuback_vals[] = {
{ RC_SUCCESS, RC_SUCCESS_STR },
{ RC_NO_SUBSCRIPTION_EXISTED, RC_NO_SUBSCRIPTION_EXISTED_STR },
{ RC_IMPLEMENTATION_SPECIFIC_ERROR, RC_IMPLEMENTATION_SPECIFIC_ERROR_STR },
{ RC_NOT_AUTHORIZED, RC_NOT_AUTHORIZED_STR },
{ RC_TOPIC_FILTER_INVALID, RC_TOPIC_FILTER_INVALID_STR },
{ RC_PACKET_IDENTIFIER_IN_USE, RC_PACKET_IDENTIFIER_IN_USE_STR },
{ 0, NULL }
};
static const value_string mqtt_reason_code_disconnect_vals[] = {
{ RC_NORMAL_DISCONNECTION, RC_NORMAL_DISCONNECTION_STR },
{ RC_DISCONNECT_WILL, RC_DISCONNECT_WILL_STR },
{ RC_UNSPECIFIED_ERROR, RC_UNSPECIFIED_ERROR_STR },
{ RC_MALFORMED_PACKET, RC_MALFORMED_PACKET_STR },
{ RC_PROTOCOL_ERROR, RC_PROTOCOL_ERROR_STR },
{ RC_IMPLEMENTATION_SPECIFIC_ERROR, RC_IMPLEMENTATION_SPECIFIC_ERROR_STR },
{ RC_NOT_AUTHORIZED, RC_NOT_AUTHORIZED_STR },
{ RC_SERVER_BUSY, RC_SERVER_BUSY_STR },
{ RC_SERVER_SHUTTING_DOWN, RC_SERVER_SHUTTING_DOWN_STR },
/* Bad authentication method: check Table 2.6 and Table 3.13 */
{ RC_BAD_AUTHENTICATION_METHOD, RC_BAD_AUTHENTICATION_METHOD_STR },
{ RC_KEEP_ALIVE_TIMEOUT, RC_KEEP_ALIVE_TIMEOUT_STR },
{ RC_SESSION_TAKEN_OVER, RC_SESSION_TAKEN_OVER_STR },
{ RC_TOPIC_FILTER_INVALID, RC_TOPIC_FILTER_INVALID_STR },
{ RC_TOPIC_NAME_INVALID, RC_TOPIC_NAME_INVALID_STR },
{ RC_RECEIVE_MAXIMUM_EXCEEDED, RC_RECEIVE_MAXIMUM_EXCEEDED_STR },
{ RC_TOPIC_ALIAS_INVALID, RC_TOPIC_ALIAS_INVALID_STR },
{ RC_PACKET_TOO_LARGE, RC_PACKET_TOO_LARGE_STR },
{ RC_MESSAGE_RATE_TOO_HIGH, RC_MESSAGE_RATE_TOO_HIGH_STR },
{ RC_QUOTA_EXCEEDED, RC_QUOTA_EXCEEDED_STR },
{ RC_ADMINISTRATIVE_ACTION, RC_ADMINISTRATIVE_ACTION_STR },
{ RC_PAYLOAD_FORMAT_INVALID, RC_PAYLOAD_FORMAT_INVALID_STR },
{ RC_RETAIN_NOT_SUPPORTED, RC_RETAIN_NOT_SUPPORTED_STR },
{ RC_QOS_NOT_SUPPORTED, RC_QOS_NOT_SUPPORTED_STR },
{ RC_USE_ANOTHER_SERVER, RC_USE_ANOTHER_SERVER_STR },
{ RC_SERVER_MOVED, RC_SERVER_MOVED_STR },
{ RC_SHARED_SUBSCRIPTION_NOT_SUPPORTED, RC_SHARED_SUBSCRIPTION_NOT_SUPPORTED_STR },
{ RC_CONNECTION_RATE_EXCEEDED, RC_CONNECTION_RATE_EXCEEDED_STR },
{ RC_MAXIMUM_CONNECT_TIME, RC_MAXIMUM_CONNECT_TIME_STR },
{ RC_SUBSCRIPTION_IDENTIFIERS_NOT_SUPPORTED, RC_SUBSCRIPTION_IDENTIFIERS_NOT_SUPPORTED_STR },
{ RC_WILDCARD_SUBSCRIPTION_NOT_SUPPORTED, RC_WILDCARD_SUBSCRIPTION_NOT_SUPPORTED_STR },
{ 0, NULL }
};
static const value_string mqtt_reason_code_auth_vals[] = {
{ RC_SUCCESS, RC_SUCCESS_STR },
{ RC_CONTINUE_AUTHENTICATION, RC_CONTINUE_AUTHENTICATION_STR },
{ RC_RE_AUTHENTICATE, RC_RE_AUTHENTICATE_STR },
{ 0, NULL }
};
static mqtt_message_decode_t *mqtt_message_decodes;
static unsigned num_mqtt_message_decodes;
static int default_protocol_version;
static dissector_handle_t mqtt_handle;
static heur_dissector_list_t mqtt_topic_subdissector;
/* Initialize the protocol and registered fields */
static int proto_mqtt;
/* Message */
static int hf_mqtt_hdrflags;
static int hf_mqtt_msg_len;
static int hf_mqtt_msg_type;
static int hf_mqtt_reserved;
static int hf_mqtt_dup_flag;
static int hf_mqtt_qos_level;
static int hf_mqtt_retain;
static int hf_mqtt_retain_reserved;
static int hf_mqtt_conack_reserved;
static int hf_mqtt_conack_flags;
static int hf_mqtt_conackflag_reserved;
static int hf_mqtt_conackflag_sp;
static int hf_mqtt_conack_code;
static int hf_mqtt_msgid;
static int hf_mqtt_sub_qos;
static int hf_mqtt_suback_qos;
static int hf_mqtt_topic_len;
static int hf_mqtt_topic;
static int hf_mqtt_will_topic_len;
static int hf_mqtt_will_topic;
static int hf_mqtt_will_msg_len;
static int hf_mqtt_will_msg;
static int hf_mqtt_will_msg_text;
static int hf_mqtt_username_len;
static int hf_mqtt_username;
static int hf_mqtt_passwd_len;
static int hf_mqtt_passwd;
static int hf_mqtt_pubmsg;
static int hf_mqtt_pubmsg_text;
static int hf_mqtt_pubmsg_decoded;
static int hf_mqtt_proto_len;
static int hf_mqtt_proto_name;
static int hf_mqtt_client_id_len;
static int hf_mqtt_client_id;
static int hf_mqtt_proto_ver;
static int hf_mqtt_conflags;
static int hf_mqtt_conflag_user;
static int hf_mqtt_conflag_passwd;
static int hf_mqtt_conflag_will_retain;
static int hf_mqtt_conflag_will_qos;
static int hf_mqtt_conflag_will_flag;
static int hf_mqtt_conflag_clean_sess;
static int hf_mqtt_conflag_reserved;
static int hf_mqtt_keep_alive;
static int hf_mqtt_subscription_options;
/* MQTT v5.0 Reason Codes */
static int hf_mqtt_reason_code_connack;
static int hf_mqtt_reason_code_puback;
static int hf_mqtt_reason_code_pubrec;
static int hf_mqtt_reason_code_pubrel;
static int hf_mqtt_reason_code_pubcomp;
static int hf_mqtt_reason_code_suback;
static int hf_mqtt_reason_code_unsuback;
static int hf_mqtt_reason_code_disconnect;
static int hf_mqtt_reason_code_auth;
/* MQTT v5.0 Subscribe Options */
static int hf_mqtt_subscription_qos;
static int hf_mqtt_subscription_nl;
static int hf_mqtt_subscription_rap;
static int hf_mqtt_subscription_retain;
static int hf_mqtt_subscription_reserved;
/* MQTT v5.0 Properties */
static int hf_mqtt_property_len;
static int hf_mqtt_property;
static int hf_mqtt_will_property;
static int hf_mqtt_property_id;
static int hf_mqtt_prop_num;
static int hf_mqtt_prop_content_type;
static int hf_mqtt_prop_max_qos;
static int hf_mqtt_prop_topic_alias;
static int hf_mqtt_prop_unknown;
static int hf_mqtt_prop_string_len;
static int hf_mqtt_prop_string;
static int hf_mqtt_prop_key_len;
static int hf_mqtt_prop_key;
static int hf_mqtt_prop_value_len;
static int hf_mqtt_prop_value;
/* Initialize the subtree pointers */
static int ett_mqtt_hdr;
static int ett_mqtt_msg;
static int ett_mqtt_hdr_flags;
static int ett_mqtt_con_flags;
static int ett_mqtt_conack_flags;
static int ett_mqtt_property;
static int ett_mqtt_subscription_flags;
/* Initialize the expert fields */
static expert_field ei_illegal_length;
static expert_field ei_unknown_version;
static expert_field ei_unknown_topic_alias;
/* Reassemble SMPP TCP segments */
static bool reassemble_mqtt_over_tcp = true;
/* Show Publish Message as text */
static bool show_msg_as_text;
static unsigned get_mqtt_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb,
int offset, void *data _U_)
{
uint64_t msg_len;
unsigned len_offset;
len_offset = tvb_get_varint(tvb, (offset + MQTT_HDR_SIZE_BEFORE_LEN), FT_VARINT_MAX_LEN, &msg_len, ENC_VARINT_PROTOBUF);
/* Explicitly downcast the value, because the length can never be more than 4 bytes */
return (unsigned)(msg_len + len_offset + MQTT_HDR_SIZE_BEFORE_LEN);
}
static void *mqtt_message_decode_copy_cb(void *dest, const void *orig, size_t len _U_)
{
const mqtt_message_decode_t *o = (const mqtt_message_decode_t *)orig;
mqtt_message_decode_t *d = (mqtt_message_decode_t *)dest;
d->match_criteria = o->match_criteria;
d->topic_pattern = g_strdup(o->topic_pattern);
d->msg_decoding = o->msg_decoding;
d->payload_proto_name = g_strdup(o->payload_proto_name);
d->payload_proto = o->payload_proto;
return d;
}
static bool mqtt_message_decode_update_cb(void *record, char **error)
{
mqtt_message_decode_t *u = (mqtt_message_decode_t *)record;
if (u->topic_pattern == NULL || strlen(u->topic_pattern) == 0)
{
*error = g_strdup("Missing topic pattern");
return false;
}
if (u->payload_proto_name == NULL || strlen(u->payload_proto_name) == 0)
{
*error = g_strdup("Missing payload protocol");
return false;
}
if (u->match_criteria == MATCH_CRITERIA_REGEX)
{
u->topic_regex = g_regex_new(u->topic_pattern, (GRegexCompileFlags) G_REGEX_OPTIMIZE, (GRegexMatchFlags) 0, NULL);
if (!u->topic_regex)
{
*error = ws_strdup_printf("Invalid regex: %s", u->topic_pattern);
return false;
}
}
return true;
}
static void mqtt_message_decode_free_cb(void *record)
{
mqtt_message_decode_t *u = (mqtt_message_decode_t *)record;
g_free(u->topic_pattern);
if (u->topic_regex)
{
g_regex_unref(u->topic_regex);
}
g_free(u->payload_proto_name);
}
UAT_VS_DEF(message_decode, match_criteria, mqtt_message_decode_t, unsigned, MATCH_CRITERIA_EQUAL, "Equal to")
UAT_CSTRING_CB_DEF(message_decode, topic_pattern, mqtt_message_decode_t)
UAT_VS_DEF(message_decode, msg_decoding, mqtt_message_decode_t, unsigned, MSG_DECODING_NONE, "none")
UAT_DISSECTOR_DEF(message_decode, payload_proto, payload_proto, payload_proto_name, mqtt_message_decode_t)
static bool mqtt_user_decode_message(proto_tree *tree, proto_tree *mqtt_tree, packet_info *pinfo, const uint8_t *topic_str, tvbuff_t *msg_tvb)
{
mqtt_message_decode_t *message_decode_entry = NULL;
size_t topic_str_len = strlen(topic_str);
size_t topic_pattern_len;
bool match_found = false;
if (topic_str_len == 0)
{
/* No topic to match */
return false;
}
for (unsigned i = 0; i < num_mqtt_message_decodes && !match_found; i++)
{
message_decode_entry = &mqtt_message_decodes[i];
switch (message_decode_entry->match_criteria)
{
case MATCH_CRITERIA_EQUAL:
match_found = (strcmp(topic_str, message_decode_entry->topic_pattern) == 0);
break;
case MATCH_CRITERIA_CONTAINS:
match_found = (strstr(topic_str, message_decode_entry->topic_pattern) != NULL);
break;
case MATCH_CRITERIA_STARTS_WITH:
topic_pattern_len = strlen(message_decode_entry->topic_pattern);
match_found = ((topic_str_len >= topic_pattern_len) &&
(strncmp(topic_str, message_decode_entry->topic_pattern, topic_pattern_len) == 0));
break;
case MATCH_CRITERIA_ENDS_WITH:
topic_pattern_len = strlen(message_decode_entry->topic_pattern);
match_found = ((topic_str_len >= topic_pattern_len) &&
(strcmp(topic_str + (topic_str_len - topic_pattern_len), message_decode_entry->topic_pattern) == 0));
break;
case MATCH_CRITERIA_REGEX:
if (message_decode_entry->topic_regex)
{
GMatchInfo *match_info = NULL;
/* DISSECTOR_ASSERT(g_utf8_validate(topic_str, -1, NULL)); */
g_regex_match(message_decode_entry->topic_regex, topic_str, (GRegexMatchFlags) 0, &match_info);
match_found = g_match_info_matches(match_info);
g_match_info_free(match_info);
}
break;
default:
/* Unknown match criteria */
break;
}
}
if (match_found)
{
if (message_decode_entry->msg_decoding == MSG_DECODING_COMPRESSED)
{
msg_tvb = tvb_child_uncompress_zlib(msg_tvb, msg_tvb, 0, tvb_reported_length(msg_tvb));
if (msg_tvb)
{
add_new_data_source(pinfo, msg_tvb, "Uncompressed Message");
}
}
if (msg_tvb)
{
proto_item *ti = proto_tree_add_string(mqtt_tree, hf_mqtt_pubmsg_decoded, msg_tvb, 0, -1,
message_decode_entry->payload_proto_name);
proto_item_set_generated(ti);
call_dissector(message_decode_entry->payload_proto, msg_tvb, pinfo, tree);
}
}
return match_found;
}
static unsigned dissect_string(tvbuff_t *tvb, proto_tree *tree, unsigned offset, int hf_len, int hf_value)
{
uint32_t prop_len;
proto_tree_add_item_ret_uint(tree, hf_len, tvb, offset, 2, ENC_BIG_ENDIAN, &prop_len);
proto_tree_add_item(tree, hf_value, tvb, offset + 2, prop_len, ENC_UTF_8|ENC_NA);
return 2 + prop_len;
}
/* MQTT v5.0: Reason Codes */
static void dissect_mqtt_reason_code(proto_tree *mqtt_tree, tvbuff_t *tvb, unsigned offset, uint8_t mqtt_msg_type)
{
static int * const hf_rcode[] = {
NULL, /* RESERVED */
NULL, /* CONNECT */
&hf_mqtt_reason_code_connack,
NULL, /* PUBLISH */
&hf_mqtt_reason_code_puback,
&hf_mqtt_reason_code_pubrec,
&hf_mqtt_reason_code_pubrel,
&hf_mqtt_reason_code_pubcomp,
NULL, /* SUBSCRIBE */
&hf_mqtt_reason_code_suback,
NULL, /* UNSUBSCRIBE */
&hf_mqtt_reason_code_unsuback,
NULL, /* PINGREQ */
NULL, /* PINGRESP */
&hf_mqtt_reason_code_disconnect,
&hf_mqtt_reason_code_auth
};
if (mqtt_msg_type < array_length(hf_rcode))
{
const int *hfindex = hf_rcode[mqtt_msg_type];
if (hfindex)
{
proto_tree_add_item(mqtt_tree, *hfindex, tvb, offset, 1, ENC_BIG_ENDIAN);
}
}
}
/* MQTT v5.0: dissect the MQTT properties */
static unsigned dissect_mqtt_properties(tvbuff_t *tvb, packet_info *pinfo, proto_tree *mqtt_tree, unsigned offset, int hf_property, mqtt_properties_t *mqtt_properties)
{
proto_tree *mqtt_prop_tree;
proto_item *ti;
uint64_t vbi;
const unsigned mqtt_prop_offset = tvb_get_varint(tvb, offset, FT_VARINT_MAX_LEN, &vbi, ENC_VARINT_PROTOBUF);
/* Property Length field can be stored in uint32 */
const unsigned mqtt_prop_len = (int)vbi;
/* Add the MQTT branch to the main tree */
/* hf_property is usually hf_mqtt_property, but can also be
* hf_mqtt_will_property when a Will is provided in a CONNECT packet */
ti = proto_tree_add_item(mqtt_tree, hf_property, tvb, offset, mqtt_prop_offset + mqtt_prop_len, ENC_NA);
mqtt_prop_tree = proto_item_add_subtree(ti, ett_mqtt_property);
proto_tree_add_item(mqtt_prop_tree, hf_mqtt_property_len, tvb, offset, mqtt_prop_offset, ENC_LITTLE_ENDIAN|ENC_VARINT_PROTOBUF);
offset += mqtt_prop_offset;
const unsigned bytes_to_read = offset + mqtt_prop_len;
while (offset < bytes_to_read)
{
uint32_t prop_id;
proto_tree_add_item_ret_uint(mqtt_prop_tree, hf_mqtt_property_id, tvb, offset, 1, ENC_BIG_ENDIAN, &prop_id);
offset += 1;
switch (prop_id)
{
case PROP_PAYLOAD_FORMAT_INDICATOR:
case PROP_REQUEST_PROBLEM_INFORMATION:
case PROP_REQUEST_RESPONSE_INFORMATION:
case PROP_RETAIN_AVAILABLE:
case PROP_WILDCARD_SUBSCRIPTION_AVAILABLE:
case PROP_SUBSCRIPTION_IDENTIFIER_AVAILABLE:
case PROP_SHARED_SUBSCRIPTION_AVAILABLE:
proto_tree_add_item(mqtt_prop_tree, hf_mqtt_prop_num, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
break;
case PROP_MAXIMUM_QOS:
proto_tree_add_item(mqtt_prop_tree, hf_mqtt_prop_max_qos, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
break;
case PROP_TOPIC_ALIAS:
proto_tree_add_item_ret_uint(mqtt_prop_tree, hf_mqtt_prop_topic_alias, tvb, offset, 2, ENC_BIG_ENDIAN, &mqtt_properties->topic_alias);
offset += 2;
break;
case PROP_SERVER_KEEP_ALIVE:
case PROP_RECEIVE_MAXIMUM:
case PROP_TOPIC_ALIAS_MAXIMUM:
proto_tree_add_item(mqtt_prop_tree, hf_mqtt_prop_num, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
break;
case PROP_PUBLICATION_EXPIRY_INTERVAL:
case PROP_SESSION_EXPIRY_INTERVAL:
case PROP_WILL_DELAY_INTERVAL:
case PROP_MAXIMUM_PACKET_SIZE:
proto_tree_add_item(mqtt_prop_tree, hf_mqtt_prop_num, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
break;
case PROP_SUBSCRIPTION_IDENTIFIER:
{
int vbi_len;
proto_tree_add_item_ret_length(mqtt_prop_tree, hf_mqtt_prop_num, tvb, offset, -1, ENC_LITTLE_ENDIAN|ENC_VARINT_PROTOBUF, &vbi_len);
offset += vbi_len;
break;
}
case PROP_CONTENT_TYPE:
{
int length;
proto_tree_add_item_ret_string_and_length(mqtt_prop_tree, hf_mqtt_prop_content_type, tvb, offset, 2, ENC_UTF_8, pinfo->pool, &mqtt_properties->content_type, &length);
offset += length;
break;
}
case PROP_RESPONSE_TOPIC:
case PROP_CORRELATION_DATA:
case PROP_ASSIGNED_CLIENT_IDENTIFIER:
case PROP_AUTH_METHOD:
case PROP_AUTH_DATA:
case PROP_RESPONSE_INFORMATION:
case PROP_SERVER_REFERENCE:
case PROP_REASON_STRING:
offset += dissect_string(tvb, mqtt_prop_tree, offset, hf_mqtt_prop_string_len, hf_mqtt_prop_string);
break;
case PROP_USER_PROPERTY:
offset += dissect_string(tvb, mqtt_prop_tree, offset, hf_mqtt_prop_key_len, hf_mqtt_prop_key);
offset += dissect_string(tvb, mqtt_prop_tree, offset, hf_mqtt_prop_value_len, hf_mqtt_prop_value);
break;
default:
proto_tree_add_item(mqtt_prop_tree, hf_mqtt_prop_unknown, tvb, offset, bytes_to_read - offset, ENC_UTF_8);
offset += (bytes_to_read - offset);
break;
}
}
return mqtt_prop_offset + mqtt_prop_len;
}
/* Dissect the MQTT message */
static int dissect_mqtt(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
uint8_t mqtt_fixed_hdr;
uint8_t mqtt_msg_type;
proto_item *ti;
const uint8_t *topic_str = "";
proto_item *mqtt_ti;
proto_tree *mqtt_tree;
uint64_t mqtt_con_flags;
uint64_t msg_len = 0;
int mqtt_msg_len = 0;
uint32_t mqtt_str_len;
uint16_t mqtt_len_offset;
int mqtt_payload_len;
uint32_t mqtt_msgid;
conversation_t *conv;
mqtt_conv_t *mqtt;
mqtt_properties_t mqtt_properties = { 0 };
mqtt_properties_t mqtt_will_properties = { 0 };
unsigned offset = 0;
bool msg_handled = false;
static int * const publish_fields[] = {
&hf_mqtt_msg_type,
&hf_mqtt_dup_flag,
&hf_mqtt_qos_level,
&hf_mqtt_retain,
NULL
};
static int * const v31_pubrel_sub_unsub_fields[] = {
&hf_mqtt_msg_type,
&hf_mqtt_dup_flag,
&hf_mqtt_qos_level,
&hf_mqtt_retain_reserved,
NULL
};
static int * const other_fields[] = {
&hf_mqtt_msg_type,
&hf_mqtt_reserved,
NULL
};
static int * const connect_flags[] = {
&hf_mqtt_conflag_user,
&hf_mqtt_conflag_passwd,
&hf_mqtt_conflag_will_retain,
&hf_mqtt_conflag_will_qos,
&hf_mqtt_conflag_will_flag,
&hf_mqtt_conflag_clean_sess,
&hf_mqtt_conflag_reserved,
NULL
};
static int * const connack_flags[] = {
&hf_mqtt_conackflag_reserved,
&hf_mqtt_conackflag_sp,
NULL
};
static int * const v50_subscription_flags[] = {
&hf_mqtt_subscription_reserved,
&hf_mqtt_subscription_retain,
&hf_mqtt_subscription_rap,
&hf_mqtt_subscription_nl,
&hf_mqtt_subscription_qos,
NULL
};
/* Extract the message ID */
mqtt_fixed_hdr = tvb_get_uint8(tvb, offset);
mqtt_msg_type = mqtt_fixed_hdr >> 4;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "MQTT");
col_append_sep_str(pinfo->cinfo, COL_INFO, ", ", val_to_str_ext(mqtt_msg_type, &mqtt_msgtype_vals_ext, "Unknown (0x%02x)"));
/* Add the MQTT branch to the main tree */
mqtt_ti = proto_tree_add_item(tree, proto_mqtt, tvb, 0, -1, ENC_NA);
mqtt_tree = proto_item_add_subtree(mqtt_ti, ett_mqtt_hdr);
conv = find_or_create_conversation(pinfo);
mqtt = (mqtt_conv_t *)conversation_get_proto_data(conv, proto_mqtt);
if (mqtt == NULL)
{
mqtt = wmem_new0(wmem_file_scope(), mqtt_conv_t);
mqtt->runtime_proto_version = default_protocol_version;
conversation_add_proto_data(conv, proto_mqtt, mqtt);