[457] | 1 | /**
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| 2 | * @file
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| 3 | * DNS API
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| 4 | */
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| 5 |
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| 6 | /**
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| 7 | * lwip DNS resolver header file.
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| 8 |
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| 9 | * Author: Jim Pettinato
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| 10 | * April 2007
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| 11 |
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| 12 | * ported from uIP resolv.c Copyright (c) 2002-2003, Adam Dunkels.
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| 13 | *
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| 14 | * Redistribution and use in source and binary forms, with or without
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| 15 | * modification, are permitted provided that the following conditions
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| 16 | * are met:
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| 17 | * 1. Redistributions of source code must retain the above copyright
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| 18 | * notice, this list of conditions and the following disclaimer.
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| 19 | * 2. Redistributions in binary form must reproduce the above copyright
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| 20 | * notice, this list of conditions and the following disclaimer in the
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| 21 | * documentation and/or other materials provided with the distribution.
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| 22 | * 3. The name of the author may not be used to endorse or promote
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| 23 | * products derived from this software without specific prior
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| 24 | * written permission.
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| 25 | *
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| 26 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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| 27 | * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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| 28 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 29 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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| 30 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 31 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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| 32 | * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 33 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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| 34 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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| 35 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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| 36 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 37 | */
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| 38 |
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| 39 | #ifndef LWIP_HDR_DNS_H
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| 40 | #define LWIP_HDR_DNS_H
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| 41 |
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| 42 | #include "lwip/opt.h"
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| 43 |
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| 44 | #if LWIP_DNS
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| 45 |
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| 46 | #include "lwip/ip_addr.h"
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| 47 | #include "lwip/err.h"
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| 48 |
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| 49 | #ifdef __cplusplus
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| 50 | extern "C" {
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| 51 | #endif
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| 52 |
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| 53 | /** DNS timer period */
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| 54 | #define DNS_TMR_INTERVAL 1000
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| 55 |
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| 56 | /* DNS resolve types: */
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| 57 | #define LWIP_DNS_ADDRTYPE_IPV4 0
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| 58 | #define LWIP_DNS_ADDRTYPE_IPV6 1
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| 59 | #define LWIP_DNS_ADDRTYPE_IPV4_IPV6 2 /* try to resolve IPv4 first, try IPv6 if IPv4 fails only */
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| 60 | #define LWIP_DNS_ADDRTYPE_IPV6_IPV4 3 /* try to resolve IPv6 first, try IPv4 if IPv6 fails only */
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| 61 | #if LWIP_IPV4 && LWIP_IPV6
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| 62 | #ifndef LWIP_DNS_ADDRTYPE_DEFAULT
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| 63 | #define LWIP_DNS_ADDRTYPE_DEFAULT LWIP_DNS_ADDRTYPE_IPV4_IPV6
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| 64 | #endif
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| 65 | #elif LWIP_IPV4
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| 66 | #define LWIP_DNS_ADDRTYPE_DEFAULT LWIP_DNS_ADDRTYPE_IPV4
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| 67 | #else
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| 68 | #define LWIP_DNS_ADDRTYPE_DEFAULT LWIP_DNS_ADDRTYPE_IPV6
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| 69 | #endif
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| 70 |
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| 71 | #if DNS_LOCAL_HOSTLIST
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| 72 | /** struct used for local host-list */
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| 73 | struct local_hostlist_entry {
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| 74 | /** static hostname */
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| 75 | const char *name;
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| 76 | /** static host address in network byteorder */
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| 77 | ip_addr_t addr;
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| 78 | struct local_hostlist_entry *next;
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| 79 | };
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| 80 | #define DNS_LOCAL_HOSTLIST_ELEM(name, addr_init) {name, addr_init, NULL}
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| 81 | #if DNS_LOCAL_HOSTLIST_IS_DYNAMIC
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| 82 | #ifndef DNS_LOCAL_HOSTLIST_MAX_NAMELEN
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| 83 | #define DNS_LOCAL_HOSTLIST_MAX_NAMELEN DNS_MAX_NAME_LENGTH
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| 84 | #endif
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| 85 | #define LOCALHOSTLIST_ELEM_SIZE ((sizeof(struct local_hostlist_entry) + DNS_LOCAL_HOSTLIST_MAX_NAMELEN + 1))
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| 86 | #endif /* DNS_LOCAL_HOSTLIST_IS_DYNAMIC */
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| 87 | #endif /* DNS_LOCAL_HOSTLIST */
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| 88 |
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| 89 | #if LWIP_IPV4
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| 90 | extern const ip_addr_t dns_mquery_v4group;
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| 91 | #endif /* LWIP_IPV4 */
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| 92 | #if LWIP_IPV6
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| 93 | extern const ip_addr_t dns_mquery_v6group;
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| 94 | #endif /* LWIP_IPV6 */
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| 95 |
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| 96 | /** Callback which is invoked when a hostname is found.
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| 97 | * A function of this type must be implemented by the application using the DNS resolver.
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| 98 | * @param name pointer to the name that was looked up.
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| 99 | * @param ipaddr pointer to an ip_addr_t containing the IP address of the hostname,
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| 100 | * or NULL if the name could not be found (or on any other error).
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| 101 | * @param callback_arg a user-specified callback argument passed to dns_gethostbyname
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| 102 | */
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| 103 | typedef void (*dns_found_callback)(const char *name, const ip_addr_t *ipaddr, void *callback_arg);
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| 104 |
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| 105 | void dns_init(void);
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| 106 | void dns_tmr(void);
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| 107 | void dns_setserver(u8_t numdns, const ip_addr_t *dnsserver);
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| 108 | const ip_addr_t* dns_getserver(u8_t numdns);
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| 109 | err_t dns_gethostbyname(const char *hostname, ip_addr_t *addr,
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| 110 | dns_found_callback found, void *callback_arg);
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| 111 | err_t dns_gethostbyname_addrtype(const char *hostname, ip_addr_t *addr,
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| 112 | dns_found_callback found, void *callback_arg,
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| 113 | u8_t dns_addrtype);
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| 114 |
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| 115 |
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| 116 | #if DNS_LOCAL_HOSTLIST
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| 117 | size_t dns_local_iterate(dns_found_callback iterator_fn, void *iterator_arg);
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| 118 | err_t dns_local_lookup(const char *hostname, ip_addr_t *addr, u8_t dns_addrtype);
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| 119 | #if DNS_LOCAL_HOSTLIST_IS_DYNAMIC
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| 120 | int dns_local_removehost(const char *hostname, const ip_addr_t *addr);
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| 121 | err_t dns_local_addhost(const char *hostname, const ip_addr_t *addr);
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| 122 | #endif /* DNS_LOCAL_HOSTLIST_IS_DYNAMIC */
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| 123 | #endif /* DNS_LOCAL_HOSTLIST */
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| 124 |
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| 125 | #ifdef __cplusplus
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| 126 | }
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| 127 | #endif
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| 128 |
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| 129 | #endif /* LWIP_DNS */
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| 130 |
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| 131 | #endif /* LWIP_HDR_DNS_H */
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