FreeRTOS/Common/ethernet/lwIP_130/src/include/lwip/dns.h

   1 /**
   2  * lwip DNS resolver header file.
   3
   4  * Author: Jim Pettinato
   5  *   April 2007
   6
   7  * ported from uIP resolv.c Copyright (c) 2002-2003, Adam Dunkels.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. The name of the author may not be used to endorse or promote
  18  *    products derived from this software without specific prior
  19  *    written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
  22  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  23  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  25  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  27  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  28  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  29  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  30  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  31  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #ifndef __LWIP_DNS_H__
  35 #define __LWIP_DNS_H__
  36
  37 #include "lwip/opt.h"
  38
  39 #if LWIP_DNS /* don't build if not configured for use in lwipopts.h */
  40
  41 /** DNS timer period */
  42 #define DNS_TMR_INTERVAL          1000
  43
  44 /** DNS field TYPE used for "Resource Records" */
  45 #define DNS_RRTYPE_A              1     /* a host address */
  46 #define DNS_RRTYPE_NS             2     /* an authoritative name server */
  47 #define DNS_RRTYPE_MD             3     /* a mail destination (Obsolete - use MX) */
  48 #define DNS_RRTYPE_MF             4     /* a mail forwarder (Obsolete - use MX) */
  49 #define DNS_RRTYPE_CNAME          5     /* the canonical name for an alias */
  50 #define DNS_RRTYPE_SOA            6     /* marks the start of a zone of authority */
  51 #define DNS_RRTYPE_MB             7     /* a mailbox domain name (EXPERIMENTAL) */
  52 #define DNS_RRTYPE_MG             8     /* a mail group member (EXPERIMENTAL) */
  53 #define DNS_RRTYPE_MR             9     /* a mail rename domain name (EXPERIMENTAL) */
  54 #define DNS_RRTYPE_NULL           10    /* a null RR (EXPERIMENTAL) */
  55 #define DNS_RRTYPE_WKS            11    /* a well known service description */
  56 #define DNS_RRTYPE_PTR            12    /* a domain name pointer */
  57 #define DNS_RRTYPE_HINFO          13    /* host information */
  58 #define DNS_RRTYPE_MINFO          14    /* mailbox or mail list information */
  59 #define DNS_RRTYPE_MX             15    /* mail exchange */
  60 #define DNS_RRTYPE_TXT            16    /* text strings */
  61
  62 /** DNS field CLASS used for "Resource Records" */
  63 #define DNS_RRCLASS_IN            1     /* the Internet */
  64 #define DNS_RRCLASS_CS            2     /* the CSNET class (Obsolete - used only for examples in some obsolete RFCs) */
  65 #define DNS_RRCLASS_CH            3     /* the CHAOS class */
  66 #define DNS_RRCLASS_HS            4     /* Hesiod [Dyer 87] */
  67 #define DNS_RRCLASS_FLUSH         0x800 /* Flush bit */
  68
  69 /** Callback which is invoked when a hostname is found.
  70  * A function of this type must be implemented by the application using the DNS resolver.
  71  * @param name pointer to the name that was looked up.
  72  * @param ipaddr pointer to a struct ip_addr containing the IP address of the hostname,
  73  *        or NULL if the name could not be found (or on any other error).
  74  * @param callback_arg a user-specified callback argument passed to dns_gethostbyname
  75 */
  76 typedef void (*dns_found_callback)(const char *name, struct ip_addr *ipaddr, void *callback_arg);
  77
  78
  79 void           dns_init(void);
  80
  81 void           dns_tmr(void);
  82
  83 void           dns_setserver(u8_t numdns, struct ip_addr *dnsserver);
  84
  85 struct ip_addr dns_getserver(u8_t numdns);
  86
  87 err_t          dns_gethostbyname(const char *hostname, struct ip_addr *addr,
  88                                  dns_found_callback found, void *callback_arg);
  89
  90 #endif /* LWIP_DNS */
  91
  92 #endif /* __LWIP_DNS_H__ */