125 lines
5.6 KiB
C
125 lines
5.6 KiB
C
|
/**
|
||
|
|
* 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 */
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
extern "C" {
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/** 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 */
|
||
|
|
|
||
|
|
/* The size used for the next line is rather a hack, but it prevents including socket.h in all files
|
||
|
|
that include memp.h, and that would possibly break portability (since socket.h defines some types
|
||
|
|
and constants possibly already define by the OS).
|
||
|
|
Calculation rule:
|
||
|
|
sizeof(struct addrinfo) + sizeof(struct sockaddr_in) + DNS_MAX_NAME_LENGTH + 1 byte zero-termination */
|
||
|
|
#define NETDB_ELEM_SIZE (32 + 16 + DNS_MAX_NAME_LENGTH + 1)
|
||
|
|
|
||
|
|
#if DNS_LOCAL_HOSTLIST
|
||
|
|
/** struct used for local host-list */
|
||
|
|
struct local_hostlist_entry {
|
||
|
|
/** static hostname */
|
||
|
|
const char *name;
|
||
|
|
/** static host address in network byteorder */
|
||
|
|
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 */
|
||
|
|
|
||
|
|
/** 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 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).
|
||
|
|
* @param callback_arg a user-specified callback argument passed to dns_gethostbyname
|
||
|
|
*/
|
||
|
|
typedef void (*dns_found_callback)(const char *name, ip_addr_t *ipaddr, void *callback_arg);
|
||
|
|
|
||
|
|
void dns_init(void);
|
||
|
|
void dns_tmr(void);
|
||
|
|
void dns_setserver(u8_t numdns, 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);
|
||
|
|
|
||
|
|
#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_DNS_H__ */
|