/** @file
  Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>
  This program and the accompanying materials are licensed and made available under
  the terms and conditions of the BSD License that accompanies this distribution.
  The full text of the license may be found at
  http://opensource.org/licenses/bsd-license.php.

  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.


 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 * All rights reserved.
 *
 * 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. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``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 PROJECT OR CONTRIBUTORS 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.

 * Issues to be discussed:
 * - Thread safe-ness must be checked
 * - Return values.  There seems to be no standard for return value (RFC2133)
 *   but INRIA implementation returns EAI_xxx defined for getaddrinfo().
**/

#if 0
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <arpa/nameser.h>
#include <netdb.h>
#include <resolv.h>
#include <string.h>
#include <stddef.h>

#include "addrinfo.h"
#endif

#define SUCCESS 0
#define YES 1
#define NO  0

static struct gni_afd {
    int a_af;
    int a_addrlen;
    int a_socklen;
    int a_off;
} gni_afdl [] = {
#ifdef ENABLE_IPV6
    {PF_INET6, sizeof(struct in6_addr), sizeof(struct sockaddr_in6),
        offsetof(struct sockaddr_in6, sin6_addr)},
#endif
    {PF_INET, sizeof(struct in_addr), sizeof(struct sockaddr_in),
        offsetof(struct sockaddr_in, sin_addr)},
    {0, 0, 0},
};

struct gni_sockinet {
    u_char      si_len;
    u_char      si_family;
    u_short     si_port;
};

#define ENI_NOSOCKET    0
#define ENI_NOSERVNAME  1
#define ENI_NOHOSTNAME  2
#define ENI_MEMORY      3
#define ENI_SYSTEM      4
#define ENI_FAMILY      5
#define ENI_SALEN       6

/* forward declaration to make gcc happy */
int getnameinfo Py_PROTO((const struct sockaddr *, size_t, char *, size_t,
                          char *, size_t, int));

int
getnameinfo(sa, salen, host, hostlen, serv, servlen, flags)
    const struct sockaddr *sa;
    size_t salen;
    char *host;
    size_t hostlen;
    char *serv;
    size_t servlen;
    int flags;
{
    struct gni_afd *gni_afd;
    struct servent *sp;
    struct hostent *hp;
    u_short port;
    int family, len, i;
    char *addr, *p;
    u_long v4a;
#ifdef ENABLE_IPV6
    u_char pfx;
    int h_error;
#endif
    char numserv[512];
    char numaddr[512];

    if (sa == NULL)
        return ENI_NOSOCKET;

#ifdef HAVE_SOCKADDR_SA_LEN
    len = sa->sa_len;
    if (len != salen) return ENI_SALEN;
#else
    len = salen;
#endif

    family = sa->sa_family;
    for (i = 0; gni_afdl[i].a_af; i++)
        if (gni_afdl[i].a_af == family) {
            gni_afd = &gni_afdl[i];
            goto found;
        }
    return ENI_FAMILY;

 found:
    if (len != gni_afd->a_socklen) return ENI_SALEN;

    port = ((struct gni_sockinet *)sa)->si_port; /* network byte order */
    addr = (char *)sa + gni_afd->a_off;

    if (serv == NULL || servlen == 0) {
        /* what we should do? */
    } else if (flags & NI_NUMERICSERV) {
        sprintf(numserv, "%d", ntohs(port));
        if (strlen(numserv) > servlen)
            return ENI_MEMORY;
        strcpy(serv, numserv);
    } else {
        sp = getservbyport(port, (flags & NI_DGRAM) ? "udp" : "tcp");
        if (sp) {
            if (strlen(sp->s_name) > servlen)
                return ENI_MEMORY;
            strcpy(serv, sp->s_name);
        } else
            return ENI_NOSERVNAME;
    }

    switch (sa->sa_family) {
    case AF_INET:
        v4a = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
        if (IN_MULTICAST(v4a) || IN_EXPERIMENTAL(v4a))
            flags |= NI_NUMERICHOST;
        v4a >>= IN_CLASSA_NSHIFT;
        if (v4a == 0 || v4a == IN_LOOPBACKNET)
            flags |= NI_NUMERICHOST;
        break;
#ifdef ENABLE_IPV6
    case AF_INET6:
        pfx = ((struct sockaddr_in6 *)sa)->sin6_addr.s6_addr8[0];
        if (pfx == 0 || pfx == 0xfe || pfx == 0xff)
            flags |= NI_NUMERICHOST;
        break;
#endif
    }
    if (host == NULL || hostlen == 0) {
        /* what should we do? */
    } else if (flags & NI_NUMERICHOST) {
        if (inet_ntop(gni_afd->a_af, addr, numaddr, sizeof(numaddr))
            == NULL)
            return ENI_SYSTEM;
        if (strlen(numaddr) > hostlen)
            return ENI_MEMORY;
        strcpy(host, numaddr);
    } else {
#ifdef ENABLE_IPV6
        hp = getipnodebyaddr(addr, gni_afd->a_addrlen, gni_afd->a_af, &h_error);
#else
        hp = gethostbyaddr(addr, gni_afd->a_addrlen, gni_afd->a_af);
        //h_error = h_errno;
#endif

        if (hp) {
            if (flags & NI_NOFQDN) {
                p = strchr(hp->h_name, '.');
                if (p) *p = '\0';
            }
            if (strlen(hp->h_name) > hostlen) {
#ifdef ENABLE_IPV6
                freehostent(hp);
#endif
                return ENI_MEMORY;
            }
            strcpy(host, hp->h_name);
#ifdef ENABLE_IPV6
            freehostent(hp);
#endif
        } else {
            if (flags & NI_NAMEREQD)
                return ENI_NOHOSTNAME;
            if (inet_ntop(gni_afd->a_af, addr, numaddr, sizeof(numaddr))
                == NULL)
                return ENI_NOHOSTNAME;
            if (strlen(numaddr) > hostlen)
                return ENI_MEMORY;
            strcpy(host, numaddr);
        }
    }
    return SUCCESS;
}