diff options
Diffstat (limited to 'lwip/src/include/lwip/dns.h')
| -rw-r--r-- | lwip/src/include/lwip/dns.h | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/lwip/src/include/lwip/dns.h b/lwip/src/include/lwip/dns.h new file mode 100644 index 0000000..0913415 --- /dev/null +++ b/lwip/src/include/lwip/dns.h @@ -0,0 +1,131 @@ +/** + * @file + * DNS API + */ + +/** + * 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_HDR_DNS_H +#define LWIP_HDR_DNS_H + +#include "lwip/opt.h" + +#if LWIP_DNS + +#include "lwip/ip_addr.h" +#include "lwip/err.h" + +#ifdef __cplusplus +extern "C" { +#endif + +/** DNS timer period */ +#define DNS_TMR_INTERVAL 1000 + +/* DNS resolve types: */ +#define LWIP_DNS_ADDRTYPE_IPV4 0 +#define LWIP_DNS_ADDRTYPE_IPV6 1 +#define LWIP_DNS_ADDRTYPE_IPV4_IPV6 2 /* try to resolve IPv4 first, try IPv6 if IPv4 fails only */ +#define LWIP_DNS_ADDRTYPE_IPV6_IPV4 3 /* try to resolve IPv6 first, try IPv4 if IPv6 fails only */ +#if LWIP_IPV4 && LWIP_IPV6 +#ifndef LWIP_DNS_ADDRTYPE_DEFAULT +#define LWIP_DNS_ADDRTYPE_DEFAULT LWIP_DNS_ADDRTYPE_IPV4_IPV6 +#endif +#elif LWIP_IPV4 +#define LWIP_DNS_ADDRTYPE_DEFAULT LWIP_DNS_ADDRTYPE_IPV4 +#else +#define LWIP_DNS_ADDRTYPE_DEFAULT LWIP_DNS_ADDRTYPE_IPV6 +#endif + +#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; +}; +#define DNS_LOCAL_HOSTLIST_ELEM(name, addr_init) {name, addr_init, NULL} +#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 */ + +#if LWIP_IPV4 +extern const ip_addr_t dns_mquery_v4group; +#endif /* LWIP_IPV4 */ +#if LWIP_IPV6 +extern const ip_addr_t dns_mquery_v6group; +#endif /* LWIP_IPV6 */ + +/** 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, const ip_addr_t *ipaddr, void *callback_arg); + +void dns_init(void); +void dns_tmr(void); +void dns_setserver(u8_t numdns, const ip_addr_t *dnsserver); +const 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); +err_t dns_gethostbyname_addrtype(const char *hostname, ip_addr_t *addr, + dns_found_callback found, void *callback_arg, + u8_t dns_addrtype); + + +#if DNS_LOCAL_HOSTLIST +size_t dns_local_iterate(dns_found_callback iterator_fn, void *iterator_arg); +err_t dns_local_lookup(const char *hostname, ip_addr_t *addr, u8_t dns_addrtype); +#if 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_IS_DYNAMIC */ +#endif /* DNS_LOCAL_HOSTLIST */ + +#ifdef __cplusplus +} +#endif + +#endif /* LWIP_DNS */ + +#endif /* LWIP_HDR_DNS_H */ |