/*

* Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:

*

*/

#include <sys/cdefs.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <stdapis/net/if.h>

#include <stdlib.h>

#include <string.h>

#include <errno.h>

#include <unistd.h>

/*

 * From RFC 2533:

 *

 * The second function maps an interface index into its corresponding

 * name.

 *

 *    #include <stdapis/net/if.h>

 *

 *    char  *if_indextoname(unsigned int ifindex, char *ifname);

 *

 * The ifname argument must point to a buffer of at least IF_NAMESIZE

 * bytes into which the interface name corresponding to the specified

 * index is returned.  (IF_NAMESIZE is also defined in <net/if.h> and

 * its value includes a terminating null byte at the end of the

 * interface name.) This pointer is also the return value of the

 * function.  If there is no interface corresponding to the specified

 * index, NULL is returned, and errno is set to ENXIO, if there was a

 * system error (such as running out of memory), if_indextoname returns

 * NULL and errno would be set to the proper value (e.g., ENOMEM).

 */

EXPORT_C char *

if_indextoname(unsigned int ifindex, char *ifname)

	{

	struct if_nameindex *ifi = NULL;

	struct if_nameindex *ifa;

	int found = 0;

	ifi = if_nameindex();

	if (ifi == NULL)

		{

		errno = ENXIO;

		return NULL;

		}

	for (ifa = ifi; ifa->if_index != 0; ifa++ )

		{

		if (ifindex == ifa->if_index)

			{

			strncpy(ifname, ifa->if_name, IFNAMSIZ);

			found = 1;

			break;

			}

		}

	if (found == 0) 

		{

		ifname = NULL;

		errno = ENXIO;

		}

	if_freenameindex(ifi);

	return(ifname);

	}