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