/** | |
* 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__ */ |