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#include <netdb.h> 36 37#include "lwip/sockets.h" 38 39/* some rarely used options */ 40#ifndef LWIP_DNS_API_DECLARE_H_ERRNO 41#define LWIP_DNS_API_DECLARE_H_ERRNO 1 42#endif 43 44#ifndef LWIP_DNS_API_DEFINE_ERRORS 45//#define LWIP_DNS_API_DEFINE_ERRORS 1 46#endif 47 48#ifndef LWIP_DNS_API_DECLARE_STRUCTS 49// #define LWIP_DNS_API_DECLARE_STRUCTS 1 50#endif 51 52#if LWIP_DNS_API_DEFINE_ERRORS 53/** Errors used by the DNS API functions, h_errno can be one of them */ 54#define EAI_NONAME 200 55#define EAI_SERVICE 201 56#define EAI_FAIL 202 57#define EAI_MEMORY 203 58#define EAI_FAMILY 204 59 60#define HOST_NOT_FOUND 210 61#define NO_DATA 211 62#define NO_RECOVERY 212 63#define TRY_AGAIN 213 64#define EAI_AGAIN TRY_AGAIN 65#endif /* LWIP_DNS_API_DEFINE_ERRORS */ 66 67#if LWIP_DNS_API_DECLARE_STRUCTS 68struct hostent { 69 char *h_name; /* Official name of the host. */ 70 char **h_aliases; /* A pointer to an array of pointers to alternative host names, 71 terminated by a null pointer. */ 72 int h_addrtype; /* Address type. */ 73 int h_length; /* The length, in bytes, of the address. */ 74 char **h_addr_list; /* A pointer to an array of pointers to network addresses (in 75 network byte order) for the host, terminated by a null pointer. */ 76#define h_addr h_addr_list[0] /* for backward compatibility */ 77}; 78 79struct addrinfo { 80 int ai_flags; /* Input flags. */ 81 int ai_family; /* Address family of socket. */ 82 int ai_socktype; /* Socket type. */ 83 int ai_protocol; /* Protocol of socket. */ 84 socklen_t ai_addrlen; /* Length of socket address. */ 85 struct sockaddr *ai_addr; /* Socket address of socket. */ 86 char *ai_canonname; /* Canonical name of service location. */ 87 struct addrinfo *ai_next; /* Pointer to next in list. */ 88}; 89#endif /* LWIP_DNS_API_DECLARE_STRUCTS */ 90 91#if LWIP_DNS_API_DECLARE_H_ERRNO 92/* application accessable error code set by the DNS API functions */ 93extern int h_errno; 94#endif /* LWIP_DNS_API_DECLARE_H_ERRNO */ 95 96struct hostent *lwip_gethostbyname(const char *name); 97int lwip_gethostbyname_r(const char *name, struct hostent *ret, char *buf, 98 size_t buflen, struct hostent **result, int *h_errnop); 99void lwip_freeaddrinfo(struct addrinfo *ai); 100int lwip_getaddrinfo(const char *nodename, 101 const char *servname, 102 const struct addrinfo *hints, struct addrinfo **res); 103 104#if LWIP_COMPAT_SOCKETS 105#define gethostbyname(name) lwip_gethostbyname(name) 106#define gethostbyname_r(name, ret, buf, buflen, result, h_errnop) \ 107 lwip_gethostbyname_r(name, ret, buf, buflen, result, h_errnop) 108#define freeaddrinfo(addrinfo) lwip_freeaddrinfo(a) 109#define getaddrinfo(nodname, servname, hints, res) \ 110 lwip_getaddrinfo(nodname, servname, hints, res) 111#endif /* LWIP_COMPAT_SOCKETS */ 112 113#endif /* LWIP_DNS && LWIP_SOCKET */ 114