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/*

 * 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.

 *

 * This file is part of the lwIP TCP/IP stack.

 *

 * Author: Simon Goldschmidt

 *

 */

#include "lwip/opt.h"

#if LWIP_DNS && LWIP_SOCKET

#include <stddef.h> /* for size_t */

#include "lwip/sockets.h"

/* some rarely used options */

#ifndef LWIP_DNS_API_DECLARE_H_ERRNO

#define LWIP_DNS_API_DECLARE_H_ERRNO 1

#endif

#ifndef LWIP_DNS_API_DEFINE_ERRORS

#define LWIP_DNS_API_DEFINE_ERRORS 1

#endif

#ifndef LWIP_DNS_API_DECLARE_STRUCTS

#define LWIP_DNS_API_DECLARE_STRUCTS 1

#endif

#if LWIP_DNS_API_DEFINE_ERRORS

/** Errors used by the DNS API functions, h_errno can be one of them */

#define EAI_NONAME      200

#define EAI_SERVICE     201

#define EAI_FAIL        202

#define EAI_MEMORY      203

#define HOST_NOT_FOUND  210

#define NO_DATA         211

#define NO_RECOVERY     212

#define TRY_AGAIN       213

#endif /* LWIP_DNS_API_DEFINE_ERRORS */

#if LWIP_DNS_API_DECLARE_STRUCTS

struct hostent {

    char  *h_name;      /* Official name of the host. */

    char **h_aliases;   /* A pointer to an array of pointers to alternative host names,

                           terminated by a null pointer. */

    int    h_addrtype;  /* Address type. */

    int    h_length;    /* The length, in bytes, of the address. */

    char **h_addr_list; /* A pointer to an array of pointers to network addresses (in

                           network byte order) for the host, terminated by a null pointer. */

#define h_addr h_addr_list[0] /* for backward compatibility */

};

struct addrinfo {

    int               ai_flags;      /* Input flags. */

    int               ai_family;     /* Address family of socket. */

    int               ai_socktype;   /* Socket type. */

    int               ai_protocol;   /* Protocol of socket. */

    socklen_t         ai_addrlen;    /* Length of socket address. */

    struct sockaddr  *ai_addr;       /* Socket address of socket. */

    char             *ai_canonname;  /* Canonical name of service location. */

    struct addrinfo  *ai_next;       /* Pointer to next in list. */

};

#endif /* LWIP_DNS_API_DECLARE_STRUCTS */

#if LWIP_DNS_API_DECLARE_H_ERRNO

/* application accessable error code set by the DNS API functions */

extern int h_errno;

#endif /* LWIP_DNS_API_DECLARE_H_ERRNO*/

struct hostent *lwip_gethostbyname(const char *name);

int lwip_gethostbyname_r(const char *name, struct hostent *ret, char *buf,

                size_t buflen, struct hostent **result, int *h_errnop);

void lwip_freeaddrinfo(struct addrinfo *ai);

int lwip_getaddrinfo(const char *nodename,

       const char *servname,

       const struct addrinfo *hints,

       struct addrinfo **res);

#if LWIP_COMPAT_SOCKETS

#define gethostbyname(name) lwip_gethostbyname(name)

#define gethostbyname_r(name, ret, buf, buflen, result, h_errnop) \

       lwip_gethostbyname_r(name, ret, buf, buflen, result, h_errnop)

#define freeaddrinfo(addrinfo) lwip_freeaddrinfo(addrinfo)

#define getaddrinfo(nodname, servname, hints, res) \

       lwip_getaddrinfo(nodname, servname, hints, res)

#endif /* LWIP_COMPAT_SOCKETS */

#endif /* LWIP_DNS && LWIP_SOCKET */