/* * include/haproxy/mqtt.h * This file contains structure declarations for MQTT protocol. * * Copyright 2020 Baptiste Assmann * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation, version 2.1 * exclusively. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef _HAPROXY_MQTT_T_H #define _HAPROXY_MQTT_T_H #include /* MQTT protocol version * In MQTT 3.1.1, version is called "level" */ #define MQTT_VERSION_3_1_1 4 #define MQTT_VERSION_5_0 5 /* * return code when parsing / validating MQTT messages */ #define MQTT_INVALID_MESSAGE -1 #define MQTT_NEED_MORE_DATA 0 #define MQTT_VALID_MESSAGE 1 /* * MQTT Control Packet Type: MQTT_CPT_* * * Part of the fixed headers, encoded on the first packet byte : * * +-------+-----------+-----------+-----------+---------+----------+----------+---------+------------+ * | bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | * +-------+-----------+-----------+-----------+---------+----------+----------+---------+------------+ * | field | MQTT Control Packet Type | Flags specific to each Control Packet type | * +-------+---------------------------------------------+--------------------------------------------+ * * Don't forget to "left offset by 4 bits (<< 4)" the values below when matching against the fixed * header collected in a MQTT packet. * * value 0x0 is reserved and forbidden */ enum { MQTT_CPT_INVALID = 0, MQTT_CPT_CONNECT, MQTT_CPT_CONNACK, MQTT_CPT_PUBLISH, MQTT_CPT_PUBACK, MQTT_CPT_PUBREC, MQTT_CPT_PUBREL, MQTT_CPT_PUBCOMP, MQTT_CPT_SUBSCRIBE, MQTT_CPT_SUBACK, MQTT_CPT_UNSUBSCRIBE, MQTT_CPT_UNSUBACK, MQTT_CPT_PINGREQ, MQTT_CPT_PINGRESP, MQTT_CPT_DISCONNECT, MQTT_CPT_AUTH, MQTT_CPT_ENTRIES /* used to mark the end/size of our MQTT_CPT_* list */ }; /* MQTT CONNECT packet flags */ #define MQTT_CONNECT_FL_RESERVED 0x01 #define MQTT_CONNECT_FL_CLEAN_SESSION 0x02 #define MQTT_CONNECT_FL_WILL 0x04 #define MQTT_CONNECT_FL_WILL_QOS 0x18 /* covers 2 bits 00011000 */ #define MQTT_CONNECT_FL_WILL_RETAIN 0x20 #define MQTT_CONNECT_FL_PASSWORD 0x40 #define MQTT_CONNECT_FL_USERNAME 0x80 /* MQTT packet properties indentifiers * https://docs.oasis-open.org/mqtt/mqtt/v5.0/os/mqtt-v5.0-os.html#_Toc3901029 */ #define MQTT_PROP_PAYLOAD_FORMAT_INDICATOR 0x01 #define MQTT_PROP_MESSAGE_EXPIRY_INTERVAL 0x02 #define MQTT_PROP_CONTENT_TYPE 0x03 #define MQTT_PROP_RESPONSE_TOPIC 0x08 #define MQTT_PROP_CORRELATION_DATA 0x09 #define MQTT_PROP_SESSION_EXPIRY_INTERVAL 0x11 #define MQTT_PROP_ASSIGNED_CLIENT_IDENTIFIER 0x12 #define MQTT_PROP_SERVER_KEEPALIVE 0x13 #define MQTT_PROP_AUTHENTICATION_METHOD 0x15 #define MQTT_PROP_AUTHENTICATION_DATA 0x16 #define MQTT_PROP_REQUEST_PROBLEM_INFORMATION 0x17 #define MQTT_PROP_WILL_DELAY_INTERVAL 0x18 #define MQTT_PROP_REQUEST_RESPONSE_INFORMATION 0x19 #define MQTT_PROP_RESPONSE_INFORMATION 0x1A #define MQTT_PROP_SERVER_REFERENCE 0x1C #define MQTT_PROP_RECEIVE_MAXIMUM 0x21 #define MQTT_PROP_TOPIC_ALIAS_MAXIMUM 0x22 #define MQTT_PROP_MAXIMUM_QOS 0x24 #define MQTT_PROP_RETAIN_AVAILABLE 0x25 #define MQTT_PROP_USER_PROPERTIES 0x26 #define MQTT_PROP_MAXIMUM_PACKET_SIZE 0x27 #define MQTT_PROP_WILDCARD_SUBSCRIPTION_AVAILABLE 0x28 #define MQTT_PROP_SUBSCRIPTION_IDENTIFIERS_AVAILABLE 0x29 #define MQTT_PROP_SHARED_SUBSRIPTION_AVAILABLE 0x2A #define MQTT_PROP_REASON_STRING 0x1F #define MQTT_PROP_LAST 0xFF /* MQTT minimal packet size */ #define MQTT_MIN_PKT_SIZE 2 #define MQTT_REMAINING_LENGHT_MAX_SIZE 4 /* list of supported capturable Field Names and configuration file string */ enum { MQTT_FN_INVALID = 0, MQTT_FN_FLAGS, MQTT_FN_REASON_CODE, MQTT_FN_PROTOCOL_NAME, MQTT_FN_PROTOCOL_VERSION, MQTT_FN_CLIENT_IDENTIFIER, MQTT_FN_WILL_TOPIC, MQTT_FN_WILL_PAYLOAD, MQTT_FN_USERNAME, MQTT_FN_PASSWORD, MQTT_FN_KEEPALIVE, /* MQTT 5.0 properties * https://docs.oasis-open.org/mqtt/mqtt/v5.0/os/mqtt-v5.0-os.html#_Toc3901029 */ MQTT_FN_PAYLOAD_FORMAT_INDICATOR, MQTT_FN_MESSAGE_EXPIRY_INTERVAL, MQTT_FN_CONTENT_TYPE, MQTT_FN_RESPONSE_TOPIC, MQTT_FN_CORRELATION_DATA, MQTT_FN_SUBSCRIPTION_IDENTIFIER, MQTT_FN_SESSION_EXPIRY_INTERVAL, MQTT_FN_ASSIGNED_CLIENT_IDENTIFIER, MQTT_FN_SERVER_KEEPALIVE, MQTT_FN_AUTHENTICATION_METHOD, MQTT_FN_AUTHENTICATION_DATA, MQTT_FN_REQUEST_PROBLEM_INFORMATION, MQTT_FN_DELAY_INTERVAL, MQTT_FN_REQUEST_RESPONSE_INFORMATION, MQTT_FN_RESPONSE_INFORMATION, MQTT_FN_SERVER_REFERENCE, MQTT_FN_REASON_STRING, MQTT_FN_RECEIVE_MAXIMUM, MQTT_FN_TOPIC_ALIAS_MAXIMUM, MQTT_FN_TOPIC_ALIAS, MQTT_FN_MAXIMUM_QOS, MQTT_FN_RETAIN_AVAILABLE, MQTT_FN_USER_PROPERTY, MQTT_FN_MAXIMUM_PACKET_SIZE, MQTT_FN_WILDCARD_SUBSCRIPTION_AVAILABLE, MQTT_FN_SUBSCRIPTION_IDENTIFIERS_AVAILABLE, MQTT_FN_SHARED_SUBSCRIPTION_AVAILABLE, MQTT_FN_ENTRIES /* this one must always be the latest one */ }; /* MQTT field string bit, for easy match using bitmasks * ATTENTION: "user-properties" are not supported for now */ enum { MQTT_FN_BIT_FLAGS = (1ULL << MQTT_FN_FLAGS), MQTT_FN_BIT_REASON_CODE = (1ULL << MQTT_FN_REASON_CODE), MQTT_FN_BIT_PROTOCOL_NAME = (1ULL << MQTT_FN_PROTOCOL_NAME), MQTT_FN_BIT_PROTOCOL_VERSION = (1ULL << MQTT_FN_PROTOCOL_VERSION), MQTT_FN_BIT_CLIENT_IDENTIFIER = (1ULL << MQTT_FN_CLIENT_IDENTIFIER), MQTT_FN_BIT_WILL_TOPIC = (1ULL << MQTT_FN_WILL_TOPIC), MQTT_FN_BIT_WILL_PAYLOAD = (1ULL << MQTT_FN_WILL_PAYLOAD), MQTT_FN_BIT_USERNAME = (1ULL << MQTT_FN_USERNAME), MQTT_FN_BIT_PASSWORD = (1ULL << MQTT_FN_PASSWORD), MQTT_FN_BIT_KEEPALIVE = (1ULL << MQTT_FN_KEEPALIVE), MQTT_FN_BIT_PAYLOAD_FORMAT_INDICATOR = (1ULL << MQTT_FN_PAYLOAD_FORMAT_INDICATOR), MQTT_FN_BIT_MESSAGE_EXPIRY_INTERVAL = (1ULL << MQTT_FN_MESSAGE_EXPIRY_INTERVAL), MQTT_FN_BIT_CONTENT_TYPE = (1ULL << MQTT_FN_CONTENT_TYPE), MQTT_FN_BIT_RESPONSE_TOPIC = (1ULL << MQTT_FN_RESPONSE_TOPIC), MQTT_FN_BIT_CORRELATION_DATA = (1ULL << MQTT_FN_CORRELATION_DATA), MQTT_FN_BIT_SUBSCRIPTION_IDENTIFIER = (1ULL << MQTT_FN_SUBSCRIPTION_IDENTIFIER), MQTT_FN_BIT_SESSION_EXPIRY_INTERVAL = (1ULL << MQTT_FN_SESSION_EXPIRY_INTERVAL), MQTT_FN_BIT_ASSIGNED_CLIENT_IDENTIFIER = (1ULL << MQTT_FN_ASSIGNED_CLIENT_IDENTIFIER), MQTT_FN_BIT_SERVER_KEEPALIVE = (1ULL << MQTT_FN_SERVER_KEEPALIVE), MQTT_FN_BIT_AUTHENTICATION_METHOD = (1ULL << MQTT_FN_AUTHENTICATION_METHOD), MQTT_FN_BIT_AUTHENTICATION_DATA = (1ULL << MQTT_FN_AUTHENTICATION_DATA), MQTT_FN_BIT_REQUEST_PROBLEM_INFORMATION = (1ULL << MQTT_FN_REQUEST_PROBLEM_INFORMATION), MQTT_FN_BIT_DELAY_INTERVAL = (1ULL << MQTT_FN_DELAY_INTERVAL), MQTT_FN_BIT_REQUEST_RESPONSE_INFORMATION = (1ULL << MQTT_FN_REQUEST_RESPONSE_INFORMATION), MQTT_FN_BIT_RESPONSE_INFORMATION = (1ULL << MQTT_FN_RESPONSE_INFORMATION), MQTT_FN_BIT_SERVER_REFERENCE = (1ULL << MQTT_FN_SERVER_REFERENCE), MQTT_FN_BIT_REASON_STRING = (1ULL << MQTT_FN_REASON_STRING), MQTT_FN_BIT_RECEIVE_MAXIMUM = (1ULL << MQTT_FN_RECEIVE_MAXIMUM), MQTT_FN_BIT_TOPIC_ALIAS_MAXIMUM = (1ULL << MQTT_FN_TOPIC_ALIAS_MAXIMUM), MQTT_FN_BIT_TOPIC_ALIAS = (1ULL << MQTT_FN_TOPIC_ALIAS), MQTT_FN_BIT_MAXIMUM_QOS = (1ULL << MQTT_FN_MAXIMUM_QOS), MQTT_FN_BIT_RETAIN_AVAILABLE = (1ULL << MQTT_FN_RETAIN_AVAILABLE), MQTT_FN_BIT_USER_PROPERTY = (1ULL << MQTT_FN_USER_PROPERTY), MQTT_FN_BIT_MAXIMUM_PACKET_SIZE = (1ULL << MQTT_FN_MAXIMUM_PACKET_SIZE), MQTT_FN_BIT_WILDCARD_SUBSCRIPTION_AVAILABLE = (1ULL << MQTT_FN_WILDCARD_SUBSCRIPTION_AVAILABLE), MQTT_FN_BIT_SUBSCRIPTION_IDENTIFIERS_AVAILABLE= (1ULL << MQTT_FN_SUBSCRIPTION_IDENTIFIERS_AVAILABLE), MQTT_FN_BIT_SHARED_SUBSCRIPTION_AVAILABLE = (1ULL << MQTT_FN_SHARED_SUBSCRIPTION_AVAILABLE), }; /* structure to host fields for a MQTT CONNECT packet */ #define MQTT_PROP_USER_PROPERTY_ENTRIES 5 struct connect { struct { struct ist protocol_name; uint8_t protocol_version; uint8_t flags; uint16_t keepalive; struct { uint32_t session_expiry_interval; uint16_t receive_maximum; uint32_t maximum_packet_size; uint16_t topic_alias_maximum; uint8_t request_response_information; uint8_t request_problem_information; struct { struct ist name; struct ist value; } user_props[MQTT_PROP_USER_PROPERTY_ENTRIES]; struct ist authentication_method; struct ist authentication_data; } props; } var_hdr; struct { struct ist client_identifier; struct { uint32_t delay_interval; uint8_t payload_format_indicator; uint32_t message_expiry_interval; struct ist content_type; struct ist response_topic; struct ist correlation_data; struct { struct ist name; struct ist value; } user_props[MQTT_PROP_USER_PROPERTY_ENTRIES]; } will_props; struct ist will_topic; struct ist will_payload; struct ist username; struct ist password; } payload; }; /* structure to host fields for a MQTT CONNACK packet */ struct connack { struct { uint8_t protocol_version; uint8_t flags; uint8_t reason_code; struct { uint32_t session_expiry_interval; uint16_t receive_maximum; uint8_t maximum_qos; uint8_t retain_available; uint32_t maximum_packet_size; struct ist assigned_client_identifier; uint16_t topic_alias_maximum; struct ist reason_string; struct { struct ist name; struct ist value; } user_props[MQTT_PROP_USER_PROPERTY_ENTRIES]; uint8_t wildcard_subscription_available; uint8_t subscription_identifiers_available; uint8_t shared_subsription_available; uint16_t server_keepalive; struct ist response_information; struct ist server_reference; struct ist authentication_method; struct ist authentication_data; } props; } var_hdr; }; /* structure to host a MQTT packet */ struct mqtt_pkt { struct { uint8_t type; /* MQTT_CPT_* */ uint8_t flags; /* MQTT_CPT_FL* */ uint32_t remaining_length; } fixed_hdr; union { struct connect connect; struct connack connack; } data; }; #endif /* _HAPROXY_MQTT_T_H */ /* * Local variables: * c-indent-level: 8 * c-basic-offset: 8 * End: */