#ifndef DAT_DNS_H
#define DAT_DNS_H

#include <stdint.h>
#include "dat.h"

typedef int (*dat_dns_name_iter_fn)(const char *hostname,
				    const uint8_t key[DAT_KEY_BYTES], void *context);

/* Resolve a legacy Dat DNS TXT record such as datkey=<64 hex digits>. */
int dat_dns_resolve(const char *hostname, uint8_t key[DAT_KEY_BYTES],
		    uint32_t *ttl_seconds);

/* Local dat-dns aliases are stored in $HOME/.dat/dat-dns (or USERPROFILE on
 * native Windows) and override DNS TXT. */
int dat_dns_name_set(const char *hostname, const uint8_t key[DAT_KEY_BYTES]);
int dat_dns_name_remove(const char *hostname);
int dat_dns_name_resolve(const char *hostname, uint8_t key[DAT_KEY_BYTES]);
int dat_dns_name_for_key(const uint8_t key[DAT_KEY_BYTES], char *hostname,
			 size_t hostname_capacity);
int dat_dns_name_foreach(dat_dns_name_iter_fn callback, void *context);

/* Decode TXT record character strings from one DNS answer packet. */
int dat_dns_parse_answer(const uint8_t *packet, unsigned packet_len,
			uint8_t key[DAT_KEY_BYTES], uint32_t *ttl_seconds);

#endif