/*

 * 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;

#endif

	int h_error;

	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;

}