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/**
 * lwip DNS resolver header file.
 
 * Author: Jim Pettinato
 *   April 2007
 
 * ported from uIP resolv.c Copyright (c) 2002-2003, Adam Dunkels.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote
 *    products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
#ifndef __LWIP_DNS_H__
#define __LWIP_DNS_H__
 
#include "lwip/opt.h"
 
#if LWIP_DNS /* don't build if not configured for use in lwipopts.h */
 
/** DNS timer period */
#define DNS_TMR_INTERVAL          1000
 
/** DNS field TYPE used for "Resource Records" */
#define DNS_RRTYPE_A              1     /* a host address */
#define DNS_RRTYPE_NS             2     /* an authoritative name server */
#define DNS_RRTYPE_MD             3     /* a mail destination (Obsolete - use MX) */
#define DNS_RRTYPE_MF             4     /* a mail forwarder (Obsolete - use MX) */
#define DNS_RRTYPE_CNAME          5     /* the canonical name for an alias */
#define DNS_RRTYPE_SOA            6     /* marks the start of a zone of authority */
#define DNS_RRTYPE_MB             7     /* a mailbox domain name (EXPERIMENTAL) */
#define DNS_RRTYPE_MG             8     /* a mail group member (EXPERIMENTAL) */
#define DNS_RRTYPE_MR             9     /* a mail rename domain name (EXPERIMENTAL) */
#define DNS_RRTYPE_NULL           10    /* a null RR (EXPERIMENTAL) */
#define DNS_RRTYPE_WKS            11    /* a well known service description */
#define DNS_RRTYPE_PTR            12    /* a domain name pointer */
#define DNS_RRTYPE_HINFO          13    /* host information */
#define DNS_RRTYPE_MINFO          14    /* mailbox or mail list information */
#define DNS_RRTYPE_MX             15    /* mail exchange */
#define DNS_RRTYPE_TXT            16    /* text strings */
 
/** DNS field CLASS used for "Resource Records" */
#define DNS_RRCLASS_IN            1     /* the Internet */
#define DNS_RRCLASS_CS            2     /* the CSNET class (Obsolete - used only for examples in some obsolete RFCs) */
#define DNS_RRCLASS_CH            3     /* the CHAOS class */
#define DNS_RRCLASS_HS            4     /* Hesiod [Dyer 87] */
#define DNS_RRCLASS_FLUSH         0x800 /* Flush bit */
 
/** Callback which is invoked when a hostname is found.
 * A function of this type must be implemented by the application using the DNS resolver.
 * @param name pointer to the name that was looked up.
 * @param ipaddr pointer to a struct ip_addr containing the IP address of the hostname,
 *        or NULL if the name could not be found (or on any other error).
 * @param callback_arg a user-specified callback argument passed to dns_gethostbyname
*/
typedef void (*dns_found_callback)(const char *name, struct ip_addr *ipaddr, void *callback_arg);
 
 
void           dns_init(void);
 
void           dns_tmr(void);
 
void           dns_setserver(u8_t numdns, struct ip_addr *dnsserver);
 
struct ip_addr dns_getserver(u8_t numdns);
 
err_t          dns_gethostbyname(const char *hostname, struct ip_addr *addr,
                                 dns_found_callback found, void *callback_arg);
 
#endif /* LWIP_DNS */
 
#endif /* __LWIP_DNS_H__ */