dns_sd.h

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/*
 * Copyright (c) 2020 Friedt Professional Engineering Services, Inc
 *
 * SPDX-License-Identifier: Apache-2.0
 */
 
#ifndef ZEPHYR_INCLUDE_NET_DNS_SD_H_
#define ZEPHYR_INCLUDE_NET_DNS_SD_H_
 
#include <stdint.h>
#include <sys/byteorder.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
#define DNS_SD_INSTANCE_MIN_SIZE 1
#define DNS_SD_INSTANCE_MAX_SIZE 63
#define DNS_SD_SERVICE_MIN_SIZE 2
#define DNS_SD_SERVICE_MAX_SIZE 16
#define DNS_SD_SERVICE_PREFIX '_'
#define DNS_SD_PROTO_SIZE 4
#define DNS_SD_DOMAIN_MIN_SIZE 2
#define DNS_SD_DOMAIN_MAX_SIZE 63
 
#define DNS_SD_REGISTER_SERVICE(id, instance, service, proto, domain, \
                                text, port)                           \
        static const STRUCT_SECTION_ITERABLE(dns_sd_rec, id) = {      \
                instance,                                             \
                service,                                              \
                proto,                                                \
                domain,                                               \
                (const char *)text,                                   \
                sizeof(text) - 1,                                     \
                port                                                  \
        }
 
#define DNS_SD_REGISTER_TCP_SERVICE(id, instance, service, domain, text, \
                                    port)                                \
        static const uint16_t id ## _port = sys_cpu_to_be16(port); \
        DNS_SD_REGISTER_SERVICE(id, instance, service, "_tcp", domain,   \
                                text, &id ## _port)
 
#define DNS_SD_REGISTER_UDP_SERVICE(id, instance, service, domain, text, \
                                    port)                                \
        static const uint16_t id ## _port = sys_cpu_to_be16(port); \
        DNS_SD_REGISTER_SERVICE(id, instance, service, "_udp", domain,   \
                                text, &id ## _port)
 
#define DNS_SD_EMPTY_TXT dns_sd_empty_txt
 
struct dns_sd_rec {
        const char *instance;
        const char *service;
        const char *proto;
        const char *domain;
        const char *text;
        size_t text_size;
        const uint16_t *port;
};
 
extern const char dns_sd_empty_txt[1];
 
static inline size_t dns_sd_txt_size(const struct dns_sd_rec *rec)
{
        return rec->text_size;
}
 
#ifdef __cplusplus
};
#endif
 
#endif /* ZEPHYR_INCLUDE_NET_DNS_SD_H_ */