#include "lwip/opt.h"
#include "lwip/ip_addr.h"
#include "lwip/err.h"

Macros
#define	DNS_TMR_INTERVAL 1000

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

Functions
void	dns_init (void)
void	dns_tmr (void)
void	dns_setserver (u8_t numdns, const ip_addr_t *dnsserver)
const 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)

Detailed Description

DNS API

Macro Definition Documentation

#define DNS_TMR_INTERVAL 1000

lwip DNS resolver header file.

Author: Jim Pettinato April 2007 DNS timer period

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

Callback which is invoked when a hostname is found. A function of this type must be implemented by the application using the DNS resolver.

Parameters

name	pointer to the name that was looked up.
ipaddr	pointer to an ip_addr_t containing the IP address of the hostname, or NULL if the name could not be found (or on any other error).
callback_arg	a user-specified callback argument passed to dns_gethostbyname

void dns_init ( void )

Initialize the resolver: set up the UDP pcb and configure the default server (if DNS_SERVER_ADDRESS is set).

void dns_tmr ( void )

The DNS resolver client timer - handle retries and timeouts and should be called every DNS_TMR_INTERVAL milliseconds (every second by default).