/* * SPDX-FileCopyrightText: 2015-2022 Espressif Systems (Shanghai) CO LTD * * SPDX-License-Identifier: Apache-2.0 */ #ifndef ESP_MDNS_H_ #define ESP_MDNS_H_ #ifdef __cplusplus extern "C" { #endif #include #define MDNS_TYPE_A 0x0001 #define MDNS_TYPE_PTR 0x000C #define MDNS_TYPE_TXT 0x0010 #define MDNS_TYPE_AAAA 0x001C #define MDNS_TYPE_SRV 0x0021 #define MDNS_TYPE_OPT 0x0029 #define MDNS_TYPE_NSEC 0x002F #define MDNS_TYPE_ANY 0x00FF /** * @brief Asynchronous query handle */ typedef struct mdns_search_once_s mdns_search_once_t; /** * @brief mDNS enum to specify the ip_protocol type */ typedef enum { MDNS_IP_PROTOCOL_V4, MDNS_IP_PROTOCOL_V6, MDNS_IP_PROTOCOL_MAX } mdns_ip_protocol_t; /** * @brief mDNS basic text item structure * Used in mdns_service_add() */ typedef struct { const char * key; /*!< item key name */ const char * value; /*!< item value string */ } mdns_txt_item_t; /** * @brief mDNS query linked list IP item */ typedef struct mdns_ip_addr_s { esp_ip_addr_t addr; /*!< IP address */ struct mdns_ip_addr_s * next; /*!< next IP, or NULL for the last IP in the list */ } mdns_ip_addr_t; typedef enum mdns_if_internal { MDNS_IF_STA = 0, MDNS_IF_AP = 1, MDNS_IF_ETH = 2, MDNS_IF_MAX } mdns_if_t; /** * @brief mDNS query type to be explicitly set to either Unicast or Multicast */ typedef enum { MDNS_QUERY_UNICAST, MDNS_QUERY_MULTICAST, } mdns_query_transmission_type_t; /** * @brief mDNS query result structure */ typedef struct mdns_result_s { struct mdns_result_s * next; /*!< next result, or NULL for the last result in the list */ mdns_if_t tcpip_if; /*!< interface index */ uint32_t ttl; /*!< time to live */ mdns_ip_protocol_t ip_protocol; /*!< ip_protocol type of the interface (v4/v6) */ // PTR char * instance_name; /*!< instance name */ char * service_type; /*!< service type */ char * proto; /*!< srevice protocol */ // SRV char * hostname; /*!< hostname */ uint16_t port; /*!< service port */ // TXT mdns_txt_item_t * txt; /*!< txt record */ uint8_t *txt_value_len; /*!< array of txt value len of each record */ size_t txt_count; /*!< number of txt items */ // A and AAAA mdns_ip_addr_t * addr; /*!< linked list of IP addresses found */ } mdns_result_t; typedef void (*mdns_query_notify_t)(mdns_search_once_t *search); /** * @brief Initialize mDNS on given interface * * @return * - ESP_OK on success * - ESP_ERR_INVALID_STATE when failed to register event handler * - ESP_ERR_NO_MEM on memory error * - ESP_FAIL when failed to start mdns task */ esp_err_t mdns_init(void); /** * @brief Stop and free mDNS server * */ void mdns_free(void); /** * @brief Set the hostname for mDNS server * required if you want to advertise services * * @param hostname Hostname to set * * @return * - ESP_OK success * - ESP_ERR_INVALID_ARG Parameter error * - ESP_ERR_NO_MEM memory error */ esp_err_t mdns_hostname_set(const char * hostname); /** * @brief Adds a hostname and address to be delegated * A/AAAA queries will be replied for the hostname and * services can be added to this host. * * @param hostname Hostname to add * @param address_list The IP address list of the host * * @return * - ESP_OK success * - ESP_ERR_INVALID_STATE mDNS is not running * - ESP_ERR_INVALID_ARG Parameter error * - ESP_ERR_NO_MEM memory error * */ esp_err_t mdns_delegate_hostname_add(const char * hostname, const mdns_ip_addr_t *address_list); /** * @brief Remove a delegated hostname * All the services added to this host will also be removed. * * @param hostname Hostname to remove * * @return * - ESP_OK success * - ESP_ERR_INVALID_STATE mDNS is not running * - ESP_ERR_INVALID_ARG Parameter error * - ESP_ERR_NO_MEM memory error * */ esp_err_t mdns_delegate_hostname_remove(const char * hostname); /** * @brief Query whether a hostname has been added * * @param hostname Hostname to query * * @return * - true The hostname has been added. * - false The hostname has not been added. * */ bool mdns_hostname_exists(const char * hostname); /** * @brief Set the default instance name for mDNS server * * @param instance_name Instance name to set * * @return * - ESP_OK success * - ESP_ERR_INVALID_ARG Parameter error * - ESP_ERR_NO_MEM memory error */ esp_err_t mdns_instance_name_set(const char * instance_name); /** * @brief Add service to mDNS server * * @note The value length of txt items will be automatically decided by strlen * * @param instance_name instance name to set. If NULL, * global instance name or hostname will be used. * Note that MDNS_MULTIPLE_INSTANCE config option * needs to be enabled for adding multiple instances * with the same instance type. * @param service_type service type (_http, _ftp, etc) * @param proto service protocol (_tcp, _udp) * @param port service port * @param txt string array of TXT data (eg. {{"var","val"},{"other","2"}}) * @param num_items number of items in TXT data * * @return * - ESP_OK success * - ESP_ERR_INVALID_ARG Parameter error * - ESP_ERR_NO_MEM memory error * - ESP_FAIL failed to add service */ esp_err_t mdns_service_add(const char * instance_name, const char * service_type, const char * proto, uint16_t port, mdns_txt_item_t txt[], size_t num_items); /** * @brief Add service to mDNS server with a delegated hostname * * @note The value length of txt items will be automatically decided by strlen * * @param instance_name instance name to set. If NULL, * global instance name or hostname will be used * Note that MDNS_MULTIPLE_INSTANCE config option * needs to be enabled for adding multiple instances * with the same instance type. * @param service_type service type (_http, _ftp, etc) * @param proto service protocol (_tcp, _udp) * @param hostname service hostname. If NULL, local hostname will be used. * @param port service port * @param txt string array of TXT data (eg. {{"var","val"},{"other","2"}}) * @param num_items number of items in TXT data * * @return * - ESP_OK success * - ESP_ERR_INVALID_ARG Parameter error * - ESP_ERR_NO_MEM memory error * - ESP_FAIL failed to add service */ esp_err_t mdns_service_add_for_host(const char * instance_name, const char * service_type, const char * proto, const char * hostname, uint16_t port, mdns_txt_item_t txt[], size_t num_items); /** * @brief Check whether a service has been added. * * @param service_type service type (_http, _ftp, etc) * @param proto service protocol (_tcp, _udp) * @param hostname service hostname. If NULL, checks for the local hostname. * * @return * - true Correspondding service has been added. * - false Service not found. */ bool mdns_service_exists(const char * service_type, const char * proto, const char * hostname); /** * @brief Check whether a service has been added. * * @param instance instance name * @param service_type service type (_http, _ftp, etc) * @param proto service protocol (_tcp, _udp) * @param hostname service hostname. If NULL, checks for the local hostname. * * @return * - true Correspondding service has been added. * - false Service not found. */ bool mdns_service_exists_with_instance(const char *instance, const char *service_type, const char *proto, const char *hostname); /** * @brief Remove service from mDNS server * * @param service_type service type (_http, _ftp, etc) * @param proto service protocol (_tcp, _udp) * * @return * - ESP_OK success * - ESP_ERR_INVALID_ARG Parameter error * - ESP_ERR_NOT_FOUND Service not found * - ESP_ERR_NO_MEM memory error */ esp_err_t mdns_service_remove(const char * service_type, const char * proto); /** * @brief Remove service from mDNS server with hostname * * @param instance instance name * @param service_type service type (_http, _ftp, etc) * @param proto service protocol (_tcp, _udp) * @param hostname service hostname. If NULL, local hostname will be used. * * @return * - ESP_OK success * - ESP_ERR_INVALID_ARG Parameter error * - ESP_ERR_NOT_FOUND Service not found * - ESP_ERR_NO_MEM memory error */ esp_err_t mdns_service_remove_for_host(const char *instance, const char * service_type, const char * proto, const char *hostname); /** * @brief Set instance name for service * * @param service_type service type (_http, _ftp, etc) * @param proto service protocol (_tcp, _udp) * @param instance_name instance name to set * * @return * - ESP_OK success * - ESP_ERR_INVALID_ARG Parameter error * - ESP_ERR_NOT_FOUND Service not found * - ESP_ERR_NO_MEM memory error */ esp_err_t mdns_service_instance_name_set(const char * service_type, const char * proto, const char * instance_name); /** * @brief Set instance name for service with hostname * * @param instance_old original instance name * @param service_type service type (_http, _ftp, etc) * @param proto service protocol (_tcp, _udp) * @param hostname service hostname. If NULL, local hostname will be used. * @param instance_name instance name to set * * @return * - ESP_OK success * - ESP_ERR_INVALID_ARG Parameter error * - ESP_ERR_NOT_FOUND Service not found * - ESP_ERR_NO_MEM memory error */ esp_err_t mdns_service_instance_name_set_for_host(const char * instance_old, const char * service_type, const char * proto, const char * hostname, const char * instance_name); /** * @brief Set service port * * @param service_type service type (_http, _ftp, etc) * @param proto service protocol (_tcp, _udp) * @param port service port * * @return * - ESP_OK success * - ESP_ERR_INVALID_ARG Parameter error * - ESP_ERR_NOT_FOUND Service not found * - ESP_ERR_NO_MEM memory error */ esp_err_t mdns_service_port_set(const char * service_type, const char * proto, uint16_t port); /** * @brief Set service port with hostname * * @param instance instance name * @param service_type service type (_http, _ftp, etc) * @param proto service protocol (_tcp, _udp) * @param hostname service hostname. If NULL, local hostname will be used. * @param port service port * * @return * - ESP_OK success * - ESP_ERR_INVALID_ARG Parameter error * - ESP_ERR_NOT_FOUND Service not found * - ESP_ERR_NO_MEM memory error */ esp_err_t mdns_service_port_set_for_host(const char * instance, const char * service_type, const char * proto, const char * hostname, uint16_t port); /** * @brief Replace all TXT items for service * * @note The value length of txt items will be automatically decided by strlen * * @param service_type service type (_http, _ftp, etc) * @param proto service protocol (_tcp, _udp) * @param txt array of TXT data (eg. {{"var","val"},{"other","2"}}) * @param num_items number of items in TXT data * * @return * - ESP_OK success * - ESP_ERR_INVALID_ARG Parameter error * - ESP_ERR_NOT_FOUND Service not found * - ESP_ERR_NO_MEM memory error */ esp_err_t mdns_service_txt_set(const char * service_type, const char * proto, mdns_txt_item_t txt[], uint8_t num_items); /** * @brief Replace all TXT items for service with hostname * * @note The value length of txt items will be automatically decided by strlen * * @param instance instance name * @param service_type service type (_http, _ftp, etc) * @param proto service protocol (_tcp, _udp) * @param hostname service hostname. If NULL, local hostname will be used. * @param txt array of TXT data (eg. {{"var","val"},{"other","2"}}) * @param num_items number of items in TXT data * * @return * - ESP_OK success * - ESP_ERR_INVALID_ARG Parameter error * - ESP_ERR_NOT_FOUND Service not found * - ESP_ERR_NO_MEM memory error */ esp_err_t mdns_service_txt_set_for_host(const char * instance, const char * service_type, const char * proto, const char * hostname, mdns_txt_item_t txt[], uint8_t num_items); /** * @brief Set/Add TXT item for service TXT record * * @note The value length will be automatically decided by strlen * * @param service_type service type (_http, _ftp, etc) * @param proto service protocol (_tcp, _udp) * @param key the key that you want to add/update * @param value the new value of the key * * @return * - ESP_OK success * - ESP_ERR_INVALID_ARG Parameter error * - ESP_ERR_NOT_FOUND Service not found * - ESP_ERR_NO_MEM memory error */ esp_err_t mdns_service_txt_item_set(const char * service_type, const char * proto, const char * key, const char * value); /** * @brief Set/Add TXT item for service TXT record * * @param service_type service type (_http, _ftp, etc) * @param proto service protocol (_tcp, _udp) * @param key the key that you want to add/update * @param value the new value of the key * @param value_len the length of the value * * @return * - ESP_OK success * - ESP_ERR_INVALID_ARG Parameter error * - ESP_ERR_NOT_FOUND Service not found * - ESP_ERR_NO_MEM memory error */ esp_err_t mdns_service_txt_item_set_with_explicit_value_len(const char *service_type, const char *proto, const char *key, const char *value, uint8_t value_len); /** * @brief Set/Add TXT item for service TXT record with hostname * * @note The value length will be automatically decided by strlen * * @param instance instance name * @param service_type service type (_http, _ftp, etc) * @param proto service protocol (_tcp, _udp) * @param hostname service hostname. If NULL, local hostname will be used. * @param key the key that you want to add/update * @param value the new value of the key * * @return * - ESP_OK success * - ESP_ERR_INVALID_ARG Parameter error * - ESP_ERR_NOT_FOUND Service not found * - ESP_ERR_NO_MEM memory error */ esp_err_t mdns_service_txt_item_set_for_host(const char * instance, const char * service_type, const char * proto, const char * hostname, const char * key, const char * value); /** * @brief Set/Add TXT item for service TXT record with hostname and txt value length * * @param instance instance name * @param service_type service type (_http, _ftp, etc) * @param proto service protocol (_tcp, _udp) * @param hostname service hostname. If NULL, local hostname will be used. * @param key the key that you want to add/update * @param value the new value of the key * @param value_len the length of the value * * @return * - ESP_OK success * - ESP_ERR_INVALID_ARG Parameter error * - ESP_ERR_NOT_FOUND Service not found * - ESP_ERR_NO_MEM memory error */ esp_err_t mdns_service_txt_item_set_for_host_with_explicit_value_len(const char * instance, const char *service_type, const char *proto, const char *hostname, const char *key, const char *value, uint8_t value_len); /** * @brief Remove TXT item for service TXT record * * @param service_type service type (_http, _ftp, etc) * @param proto service protocol (_tcp, _udp) * @param key the key that you want to remove * * @return * - ESP_OK success * - ESP_ERR_INVALID_ARG Parameter error * - ESP_ERR_NOT_FOUND Service not found * - ESP_ERR_NO_MEM memory error */ esp_err_t mdns_service_txt_item_remove(const char * service_type, const char * proto, const char * key); /** * @brief Remove TXT item for service TXT record with hostname * * @param instance instance name * @param service_type service type (_http, _ftp, etc) * @param proto service protocol (_tcp, _udp) * @param hostname service hostname. If NULL, local hostname will be used. * @param key the key that you want to remove * * @return * - ESP_OK success * - ESP_ERR_INVALID_ARG Parameter error * - ESP_ERR_NOT_FOUND Service not found * - ESP_ERR_NO_MEM memory error */ esp_err_t mdns_service_txt_item_remove_for_host(const char * instance, const char * service_type, const char * proto, const char * hostname, const char * key); /** * @brief Add subtype for service. * * @param instance_name instance name. If NULL, will find the first service with the same service type and protocol. * @param service_type service type (_http, _ftp, etc) * @param proto service protocol (_tcp, _udp) * @param hostname service hostname. If NULL, local hostname will be used. * @param subtype The subtype to add. * * @return * - ESP_OK success * - ESP_ERR_INVALID_ARG Parameter error * - ESP_ERR_NOT_FOUND Service not found * - ESP_ERR_NO_MEM memory error */ esp_err_t mdns_service_subtype_add_for_host(const char *instance_name, const char *service_type, const char *proto, const char *hostname, const char *subtype); /** * @brief Remove and free all services from mDNS server * * @return * - ESP_OK success * - ESP_ERR_INVALID_ARG Parameter error */ esp_err_t mdns_service_remove_all(void); /** * @brief Deletes the finished query. Call this only after the search has ended! * * @param search pointer to search object * * @return * - ESP_OK success * - ESP_ERR_INVALID_STATE search has not finished * - ESP_ERR_INVALID_ARG pointer to search object is NULL */ esp_err_t mdns_query_async_delete(mdns_search_once_t* search); /** * @brief Get results from search pointer. Results available as a pointer to the output parameter. * Pointer to search object has to be deleted via `mdns_query_async_delete` once the query has finished. * The results although have to be freed manually. * * @param search pointer to search object * @param timeout time in milliseconds to wait for answers * @param results pointer to the results of the query * @param num_results pointer to the number of the actual result items (set to NULL to ignore this return value) * * @return * True if search has finished before or at timeout * False if search timeout is over */ bool mdns_query_async_get_results(mdns_search_once_t* search, uint32_t timeout, mdns_result_t ** results, uint8_t * num_results); /** * @brief Query mDNS for host or service asynchronousely. * Search has to be tested for progress and deleted manually! * * @param name service instance or host name (NULL for PTR queries) * @param service_type service type (_http, _arduino, _ftp etc.) (NULL for host queries) * @param proto service protocol (_tcp, _udp, etc.) (NULL for host queries) * @param type type of query (MDNS_TYPE_*) * @param timeout time in milliseconds during which mDNS query is active * @param max_results maximum results to be collected * @param notifier Notification function to be called when the result is ready, can be NULL * * @return mdns_search_once_s pointer to new search object if query initiated successfully. * NULL otherwise. */ mdns_search_once_t *mdns_query_async_new(const char *name, const char *service_type, const char *proto, uint16_t type, uint32_t timeout, size_t max_results, mdns_query_notify_t notifier); /** * @brief Generic mDNS query * All following query methods are derived from this one * * @param name service instance or host name (NULL for PTR queries) * @param service_type service type (_http, _arduino, _ftp etc.) (NULL for host queries) * @param proto service protocol (_tcp, _udp, etc.) (NULL for host queries) * @param type type of query (MDNS_TYPE_*) * @param transmission_type either Unicast query, or Multicast query * @param timeout time in milliseconds to wait for answers. * @param max_results maximum results to be collected * @param results pointer to the results of the query * results must be freed using mdns_query_results_free below * * @return * - ESP_OK success * - ESP_ERR_INVALID_STATE mDNS is not running * - ESP_ERR_NO_MEM memory error * - ESP_ERR_INVALID_ARG timeout was not given */ esp_err_t mdns_query_generic(const char * name, const char * service_type, const char * proto, uint16_t type, mdns_query_transmission_type_t transmission_type, uint32_t timeout, size_t max_results, mdns_result_t ** results); /** * @brief Query mDNS for host or service * * Note that querying PTR types sends Multicast query, all other types send Unicast queries * * @param name service instance or host name (NULL for PTR queries) * @param service_type service type (_http, _arduino, _ftp etc.) (NULL for host queries) * @param proto service protocol (_tcp, _udp, etc.) (NULL for host queries) * @param type type of query (MDNS_TYPE_*) * @param timeout time in milliseconds to wait for answers. * @param max_results maximum results to be collected * @param results pointer to the results of the query * results must be freed using mdns_query_results_free below * * @return * - ESP_OK success * - ESP_ERR_INVALID_STATE mDNS is not running * - ESP_ERR_NO_MEM memory error * - ESP_ERR_INVALID_ARG timeout was not given */ esp_err_t mdns_query(const char * name, const char * service_type, const char * proto, uint16_t type, uint32_t timeout, size_t max_results, mdns_result_t ** results); /** * @brief Free query results * * @param results linked list of results to be freed */ void mdns_query_results_free(mdns_result_t * results); /** * @brief Query mDNS for service * * @param service_type service type (_http, _arduino, _ftp etc.) * @param proto service protocol (_tcp, _udp, etc.) * @param timeout time in milliseconds to wait for answer. * @param max_results maximum results to be collected * @param results pointer to the results of the query * * @return * - ESP_OK success * - ESP_ERR_INVALID_STATE mDNS is not running * - ESP_ERR_NO_MEM memory error * - ESP_ERR_INVALID_ARG parameter error */ esp_err_t mdns_query_ptr(const char * service_type, const char * proto, uint32_t timeout, size_t max_results, mdns_result_t ** results); /** * @brief Query mDNS for SRV record * * @param instance_name service instance name * @param service_type service type (_http, _arduino, _ftp etc.) * @param proto service protocol (_tcp, _udp, etc.) * @param timeout time in milliseconds to wait for answer. * @param result pointer to the result of the query * * @return * - ESP_OK success * - ESP_ERR_INVALID_STATE mDNS is not running * - ESP_ERR_NO_MEM memory error * - ESP_ERR_INVALID_ARG parameter error */ esp_err_t mdns_query_srv(const char * instance_name, const char * service_type, const char * proto, uint32_t timeout, mdns_result_t ** result); /** * @brief Query mDNS for TXT record * * @param instance_name service instance name * @param service_type service type (_http, _arduino, _ftp etc.) * @param proto service protocol (_tcp, _udp, etc.) * @param timeout time in milliseconds to wait for answer. * @param result pointer to the result of the query * * @return * - ESP_OK success * - ESP_ERR_INVALID_STATE mDNS is not running * - ESP_ERR_NO_MEM memory error * - ESP_ERR_INVALID_ARG parameter error */ esp_err_t mdns_query_txt(const char * instance_name, const char * service_type, const char * proto, uint32_t timeout, mdns_result_t ** result); /** * @brief Query mDNS for A record * * @param host_name host name to look for * @param timeout time in milliseconds to wait for answer. * @param addr pointer to the resulting IP4 address * * @return * - ESP_OK success * - ESP_ERR_INVALID_STATE mDNS is not running * - ESP_ERR_NO_MEM memory error * - ESP_ERR_INVALID_ARG parameter error */ esp_err_t mdns_query_a(const char * host_name, uint32_t timeout, esp_ip4_addr_t * addr); #if CONFIG_LWIP_IPV6 /** * @brief Query mDNS for A record * * Please note that hostname must not contain domain name, as mDNS uses '.local' domain. * * @param host_name host name to look for * @param timeout time in milliseconds to wait for answer. If 0, max_results needs to be defined * @param addr pointer to the resulting IP6 address * * @return * - ESP_OK success * - ESP_ERR_INVALID_STATE mDNS is not running * - ESP_ERR_NO_MEM memory error * - ESP_ERR_INVALID_ARG parameter error */ esp_err_t mdns_query_aaaa(const char * host_name, uint32_t timeout, esp_ip6_addr_t * addr); #endif #ifdef __cplusplus } #endif #endif /* ESP_MDNS_H_ */