1 /* 2 * Redistribution and use in source and binary forms, with or without modification, 3 * are permitted provided that the following conditions are met: 4 * 5 * 1. Redistributions of source code must retain the above copyright notice, 6 * this list of conditions and the following disclaimer. 7 * 2. Redistributions in binary form must reproduce the above copyright notice, 8 * this list of conditions and the following disclaimer in the documentation 9 * and/or other materials provided with the distribution. 10 * 3. The name of the author may not be used to endorse or promote products 11 * derived from this software without specific prior written permission. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 14 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 15 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 16 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 17 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 18 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 19 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 20 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 21 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 22 * OF SUCH DAMAGE. 23 * 24 * This file is part of the lwIP TCP/IP stack. 25 * 26 * Author: Simon Goldschmidt 27 * 28 */ 29 30 #include "lwip/opt.h" 31 32 #if LWIP_DNS && LWIP_SOCKET 33 34 #include <stddef.h> /* for size_t */ 35 36 #include "lwip/sockets.h" 37 38 /* some rarely used options */ 39 #ifndef LWIP_DNS_API_DECLARE_H_ERRNO 40 #define LWIP_DNS_API_DECLARE_H_ERRNO 1 41 #endif 42 43 #ifndef LWIP_DNS_API_DEFINE_ERRORS 44 #define LWIP_DNS_API_DEFINE_ERRORS 1 45 #endif 46 47 #ifndef LWIP_DNS_API_DECLARE_STRUCTS 48 #define LWIP_DNS_API_DECLARE_STRUCTS 1 49 #endif 50 51 #if LWIP_DNS_API_DEFINE_ERRORS 52 /** Errors used by the DNS API functions, h_errno can be one of them */ 53 #define EAI_NONAME 200 54 #define EAI_SERVICE 201 55 #define EAI_FAIL 202 56 #define EAI_MEMORY 203 57 58 #define HOST_NOT_FOUND 210 59 #define NO_DATA 211 60 #define NO_RECOVERY 212 61 #define TRY_AGAIN 213 62 #endif /* LWIP_DNS_API_DEFINE_ERRORS */ 63 64 #if LWIP_DNS_API_DECLARE_STRUCTS 65 struct hostent { 66 char *h_name; /* Official name of the host. */ 67 char **h_aliases; /* A pointer to an array of pointers to alternative host names, 68 terminated by a null pointer. */ 69 int h_addrtype; /* Address type. */ 70 int h_length; /* The length, in bytes, of the address. */ 71 char **h_addr_list; /* A pointer to an array of pointers to network addresses (in 72 network byte order) for the host, terminated by a null pointer. */ 73 #define h_addr h_addr_list[0] /* for backward compatibility */ 74 }; 75 76 struct addrinfo { 77 int ai_flags; /* Input flags. */ 78 int ai_family; /* Address family of socket. */ 79 int ai_socktype; /* Socket type. */ 80 int ai_protocol; /* Protocol of socket. */ 81 socklen_t ai_addrlen; /* Length of socket address. */ 82 struct sockaddr *ai_addr; /* Socket address of socket. */ 83 char *ai_canonname; /* Canonical name of service location. */ 84 struct addrinfo *ai_next; /* Pointer to next in list. */ 85 }; 86 #endif /* LWIP_DNS_API_DECLARE_STRUCTS */ 87 88 #if LWIP_DNS_API_DECLARE_H_ERRNO 89 /* application accessable error code set by the DNS API functions */ 90 extern int h_errno; 91 #endif /* LWIP_DNS_API_DECLARE_H_ERRNO*/ 92 93 struct hostent *lwip_gethostbyname(const char *name); 94 int lwip_gethostbyname_r(const char *name, struct hostent *ret, char *buf, 95 size_t buflen, struct hostent **result, int *h_errnop); 96 void lwip_freeaddrinfo(struct addrinfo *ai); 97 int lwip_getaddrinfo(const char *nodename, 98 const char *servname, 99 const struct addrinfo *hints, 100 struct addrinfo **res); 101 102 #if LWIP_COMPAT_SOCKETS 103 #define gethostbyname(name) lwip_gethostbyname(name) 104 #define gethostbyname_r(name, ret, buf, buflen, result, h_errnop) \ 105 lwip_gethostbyname_r(name, ret, buf, buflen, result, h_errnop) 106 #define freeaddrinfo(addrinfo) lwip_freeaddrinfo(a) 107 #define getaddrinfo(nodname, servname, hints, res) \ 108 lwip_getaddrinfo(nodname, servname, hints, res) 109 #endif /* LWIP_COMPAT_SOCKETS */ 110 111 #endif /* LWIP_DNS && LWIP_SOCKET */ 112