Marco Zecchini
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Example_RTOS
Rtos API example
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dns.h
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00001 /** 00002 * @file 00003 * DNS API 00004 */ 00005 00006 /** 00007 * lwip DNS resolver header file. 00008 00009 * Author: Jim Pettinato 00010 * April 2007 00011 00012 * ported from uIP resolv.c Copyright (c) 2002-2003, Adam Dunkels. 00013 * 00014 * Redistribution and use in source and binary forms, with or without 00015 * modification, are permitted provided that the following conditions 00016 * are met: 00017 * 1. Redistributions of source code must retain the above copyright 00018 * notice, this list of conditions and the following disclaimer. 00019 * 2. Redistributions in binary form must reproduce the above copyright 00020 * notice, this list of conditions and the following disclaimer in the 00021 * documentation and/or other materials provided with the distribution. 00022 * 3. The name of the author may not be used to endorse or promote 00023 * products derived from this software without specific prior 00024 * written permission. 00025 * 00026 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 00027 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 00028 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 00029 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 00030 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 00031 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 00032 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 00033 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 00034 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 00035 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 00036 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00037 */ 00038 00039 #ifndef LWIP_HDR_DNS_H 00040 #define LWIP_HDR_DNS_H 00041 00042 #include "lwip/opt.h" 00043 00044 #if LWIP_DNS 00045 00046 #include "lwip/ip_addr.h" 00047 00048 #ifdef __cplusplus 00049 extern "C" { 00050 #endif 00051 00052 /** DNS timer period */ 00053 #define DNS_TMR_INTERVAL 1000 00054 00055 /* DNS resolve types: */ 00056 #define LWIP_DNS_ADDRTYPE_IPV4 0 00057 #define LWIP_DNS_ADDRTYPE_IPV6 1 00058 #define LWIP_DNS_ADDRTYPE_IPV4_IPV6 2 /* try to resolve IPv4 first, try IPv6 if IPv4 fails only */ 00059 #define LWIP_DNS_ADDRTYPE_IPV6_IPV4 3 /* try to resolve IPv6 first, try IPv4 if IPv6 fails only */ 00060 #if LWIP_IPV4 && LWIP_IPV6 00061 #ifndef LWIP_DNS_ADDRTYPE_DEFAULT 00062 #define LWIP_DNS_ADDRTYPE_DEFAULT LWIP_DNS_ADDRTYPE_IPV4_IPV6 00063 #endif 00064 #elif LWIP_IPV4 00065 #define LWIP_DNS_ADDRTYPE_DEFAULT LWIP_DNS_ADDRTYPE_IPV4 00066 #else 00067 #define LWIP_DNS_ADDRTYPE_DEFAULT LWIP_DNS_ADDRTYPE_IPV6 00068 #endif 00069 00070 #if DNS_LOCAL_HOSTLIST 00071 /** struct used for local host-list */ 00072 struct local_hostlist_entry { 00073 /** static hostname */ 00074 const char *name; 00075 /** static host address in network byteorder */ 00076 ip_addr_t addr; 00077 struct local_hostlist_entry *next; 00078 }; 00079 #define DNS_LOCAL_HOSTLIST_ELEM(name, addr_init) {name, addr_init, NULL} 00080 #if DNS_LOCAL_HOSTLIST_IS_DYNAMIC 00081 #ifndef DNS_LOCAL_HOSTLIST_MAX_NAMELEN 00082 #define DNS_LOCAL_HOSTLIST_MAX_NAMELEN DNS_MAX_NAME_LENGTH 00083 #endif 00084 #define LOCALHOSTLIST_ELEM_SIZE ((sizeof(struct local_hostlist_entry) + DNS_LOCAL_HOSTLIST_MAX_NAMELEN + 1)) 00085 #endif /* DNS_LOCAL_HOSTLIST_IS_DYNAMIC */ 00086 #endif /* DNS_LOCAL_HOSTLIST */ 00087 00088 #if LWIP_IPV4 00089 extern const ip_addr_t dns_mquery_v4group; 00090 #endif /* LWIP_IPV4 */ 00091 #if LWIP_IPV6 00092 extern const ip_addr_t dns_mquery_v6group; 00093 #endif /* LWIP_IPV6 */ 00094 00095 /** Callback which is invoked when a hostname is found. 00096 * A function of this type must be implemented by the application using the DNS resolver. 00097 * @param name pointer to the name that was looked up. 00098 * @param ipaddr pointer to an ip_addr_t containing the IP address of the hostname, 00099 * or NULL if the name could not be found (or on any other error). 00100 * @param callback_arg a user-specified callback argument passed to dns_gethostbyname 00101 */ 00102 typedef void (*dns_found_callback)(const char *name, const ip_addr_t *ipaddr, void *callback_arg); 00103 00104 void dns_init(void); 00105 void dns_tmr(void); 00106 void dns_setserver(u8_t numdns, const ip_addr_t *dnsserver); 00107 const ip_addr_t* dns_getserver(u8_t numdns); 00108 err_t dns_gethostbyname(const char *hostname, ip_addr_t *addr, 00109 dns_found_callback found, void *callback_arg); 00110 err_t dns_gethostbyname_addrtype(const char *hostname, ip_addr_t *addr, 00111 dns_found_callback found, void *callback_arg, 00112 u8_t dns_addrtype); 00113 00114 00115 #if DNS_LOCAL_HOSTLIST 00116 size_t dns_local_iterate(dns_found_callback iterator_fn, void *iterator_arg); 00117 err_t dns_local_lookup(const char *hostname, ip_addr_t *addr, u8_t dns_addrtype); 00118 #if DNS_LOCAL_HOSTLIST_IS_DYNAMIC 00119 int dns_local_removehost(const char *hostname, const ip_addr_t *addr); 00120 err_t dns_local_addhost(const char *hostname, const ip_addr_t *addr); 00121 #endif /* DNS_LOCAL_HOSTLIST_IS_DYNAMIC */ 00122 #endif /* DNS_LOCAL_HOSTLIST */ 00123 00124 #ifdef __cplusplus 00125 } 00126 #endif 00127 00128 #endif /* LWIP_DNS */ 00129 00130 #endif /* LWIP_HDR_DNS_H */
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