/*
* 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);
}