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