msg.h

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/*
 * SPDX-FileCopyrightText: 2021 Freie Universität Berlin
 * SPDX-License-Identifier: LGPL-2.1-only
 */
 
#pragma once

 
#include <stdint.h>
#include <stdlib.h>
 
#ifdef __cplusplus
extern "C" {
#endif

#ifndef CONFIG_DNS_MSG_LEN
#define CONFIG_DNS_MSG_LEN         (128U)
#endif  /* CONFIG_DNS_MSG_LEN */

typedef struct __attribute__((packed)) {
    uint16_t id;        
    uint16_t flags;
    uint16_t qdcount;   
    uint16_t ancount;   
    uint16_t nscount;   
    uint16_t arcount;   
    uint8_t payload[];  
} dns_hdr_t;

size_t dns_msg_compose_query(void *dns_buf, const char *domain_name,
                             uint16_t id, int family);

int dns_msg_parse_reply(const uint8_t *buf, size_t len, int family,
                        void *addr_out, uint32_t *ttl);
 
#ifdef __cplusplus
}
#endif