Some quick code to use UDP-only (no TCP) with mBed. Echos received packets and sends packets when a button is pressed
dns.h
00001 /** 00002 * lwip DNS resolver header file. 00003 00004 * Author: Jim Pettinato 00005 * April 2007 00006 00007 * ported from uIP resolv.c Copyright (c) 2002-2003, Adam Dunkels. 00008 * 00009 * Redistribution and use in source and binary forms, with or without 00010 * modification, are permitted provided that the following conditions 00011 * are met: 00012 * 1. Redistributions of source code must retain the above copyright 00013 * notice, this list of conditions and the following disclaimer. 00014 * 2. Redistributions in binary form must reproduce the above copyright 00015 * notice, this list of conditions and the following disclaimer in the 00016 * documentation and/or other materials provided with the distribution. 00017 * 3. The name of the author may not be used to endorse or promote 00018 * products derived from this software without specific prior 00019 * written permission. 00020 * 00021 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 00022 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 00023 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 00024 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 00025 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 00026 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 00027 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 00028 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 00029 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 00030 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 00031 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00032 */ 00033 00034 #ifndef __LWIP_DNS_H__ 00035 #define __LWIP_DNS_H__ 00036 00037 #include "lwip/opt.h" 00038 00039 #if LWIP_DNS /* don't build if not configured for use in lwipopts.h */ 00040 00041 #include "lwip/err.h" 00042 00043 #ifdef __cplusplus 00044 extern "C" { 00045 #endif 00046 00047 /** DNS timer period */ 00048 #define DNS_TMR_INTERVAL 1000 00049 00050 /** DNS field TYPE used for "Resource Records" */ 00051 #define DNS_RRTYPE_A 1 /* a host address */ 00052 #define DNS_RRTYPE_NS 2 /* an authoritative name server */ 00053 #define DNS_RRTYPE_MD 3 /* a mail destination (Obsolete - use MX) */ 00054 #define DNS_RRTYPE_MF 4 /* a mail forwarder (Obsolete - use MX) */ 00055 #define DNS_RRTYPE_CNAME 5 /* the canonical name for an alias */ 00056 #define DNS_RRTYPE_SOA 6 /* marks the start of a zone of authority */ 00057 #define DNS_RRTYPE_MB 7 /* a mailbox domain name (EXPERIMENTAL) */ 00058 #define DNS_RRTYPE_MG 8 /* a mail group member (EXPERIMENTAL) */ 00059 #define DNS_RRTYPE_MR 9 /* a mail rename domain name (EXPERIMENTAL) */ 00060 #define DNS_RRTYPE_NULL 10 /* a null RR (EXPERIMENTAL) */ 00061 #define DNS_RRTYPE_WKS 11 /* a well known service description */ 00062 #define DNS_RRTYPE_PTR 12 /* a domain name pointer */ 00063 #define DNS_RRTYPE_HINFO 13 /* host information */ 00064 #define DNS_RRTYPE_MINFO 14 /* mailbox or mail list information */ 00065 #define DNS_RRTYPE_MX 15 /* mail exchange */ 00066 #define DNS_RRTYPE_TXT 16 /* text strings */ 00067 00068 /** DNS field CLASS used for "Resource Records" */ 00069 #define DNS_RRCLASS_IN 1 /* the Internet */ 00070 #define DNS_RRCLASS_CS 2 /* the CSNET class (Obsolete - used only for examples in some obsolete RFCs) */ 00071 #define DNS_RRCLASS_CH 3 /* the CHAOS class */ 00072 #define DNS_RRCLASS_HS 4 /* Hesiod [Dyer 87] */ 00073 #define DNS_RRCLASS_FLUSH 0x800 /* Flush bit */ 00074 00075 /** Callback which is invoked when a hostname is found. 00076 * A function of this type must be implemented by the application using the DNS resolver. 00077 * @param name pointer to the name that was looked up. 00078 * @param ipaddr pointer to a struct ip_addr containing the IP address of the hostname, 00079 * or NULL if the name could not be found (or on any other error). 00080 * @param callback_arg a user-specified callback argument passed to dns_gethostbyname 00081 */ 00082 typedef void (*dns_found_callback)(const char *name, struct ip_addr *ipaddr, void *callback_arg); 00083 00084 00085 void dns_init(void); 00086 00087 void dns_tmr(void); 00088 00089 void dns_setserver(u8_t numdns, struct ip_addr *dnsserver); 00090 00091 struct ip_addr dns_getserver(u8_t numdns); 00092 00093 err_t dns_gethostbyname(const char *hostname, struct ip_addr *addr, 00094 dns_found_callback found, void *callback_arg); 00095 00096 #if DNS_LOCAL_HOSTLIST && DNS_LOCAL_HOSTLIST_IS_DYNAMIC 00097 int dns_local_removehost(const char *hostname, const struct ip_addr *addr); 00098 err_t dns_local_addhost(const char *hostname, const struct ip_addr *addr); 00099 #endif /* DNS_LOCAL_HOSTLIST && DNS_LOCAL_HOSTLIST_IS_DYNAMIC */ 00100 00101 #ifdef __cplusplus 00102 }; 00103 #endif 00104 00105 #endif /* LWIP_DNS */ 00106 00107 #endif /* __LWIP_DNS_H__ */
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