dns.h

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#ifndef LWIP_HDR_DNS_H
#define LWIP_HDR_DNS_H

#include "lwip/opt.h"

#if LWIP_DNS

#include "lwip/ip_addr.h"

#ifdef __cplusplus
extern "C" {
#endif

#define DNS_TMR_INTERVAL          1000

/* DNS resolve types: */
#define LWIP_DNS_ADDRTYPE_IPV4      0
#define LWIP_DNS_ADDRTYPE_IPV6      1
#define LWIP_DNS_ADDRTYPE_IPV4_IPV6 2 /* try to resolve IPv4 first, try IPv6 if IPv4 fails only */
#define LWIP_DNS_ADDRTYPE_IPV6_IPV4 3 /* try to resolve IPv6 first, try IPv4 if IPv6 fails only */
#if LWIP_IPV4 && LWIP_IPV6
#ifndef LWIP_DNS_ADDRTYPE_DEFAULT
#define LWIP_DNS_ADDRTYPE_DEFAULT   LWIP_DNS_ADDRTYPE_IPV4_IPV6
#endif
#elif defined(LWIP_IPV4)
#define LWIP_DNS_ADDRTYPE_DEFAULT   LWIP_DNS_ADDRTYPE_IPV4
#else
#define LWIP_DNS_ADDRTYPE_DEFAULT   LWIP_DNS_ADDRTYPE_IPV6
#endif

#if DNS_LOCAL_HOSTLIST

struct local_hostlist_entry {
  const char *name;
  ip_addr_t addr;
  struct local_hostlist_entry *next;
};
#if DNS_LOCAL_HOSTLIST_IS_DYNAMIC
#ifndef DNS_LOCAL_HOSTLIST_MAX_NAMELEN
#define DNS_LOCAL_HOSTLIST_MAX_NAMELEN  DNS_MAX_NAME_LENGTH
#endif
#define LOCALHOSTLIST_ELEM_SIZE ((sizeof(struct local_hostlist_entry) + DNS_LOCAL_HOSTLIST_MAX_NAMELEN + 1))
#endif /* DNS_LOCAL_HOSTLIST_IS_DYNAMIC */
#endif /* DNS_LOCAL_HOSTLIST */

typedef void (*dns_found_callback)(const char *name, const ip_addr_t *ipaddr, void *callback_arg);

void           dns_init(void);
void           dns_tmr(void);
void           dns_setserver(u8_t numdns, const ip_addr_t *dnsserver);
ip_addr_t      dns_getserver(u8_t numdns);
err_t          dns_gethostbyname(const char *hostname, ip_addr_t *addr,
                                 dns_found_callback found, void *callback_arg);
err_t          dns_gethostbyname_addrtype(const char *hostname, ip_addr_t *addr,
                                 dns_found_callback found, void *callback_arg,
                                 u8_t dns_addrtype);


#if DNS_LOCAL_HOSTLIST && DNS_LOCAL_HOSTLIST_IS_DYNAMIC
int            dns_local_removehost(const char *hostname, const ip_addr_t *addr);
err_t          dns_local_addhost(const char *hostname, const ip_addr_t *addr);
#endif /* DNS_LOCAL_HOSTLIST && DNS_LOCAL_HOSTLIST_IS_DYNAMIC */

#ifdef __cplusplus
}
#endif

#endif /* LWIP_DNS */

#endif /* LWIP_HDR_DNS_H */