pcap_indextoname.c
Author: cmaier@cmassoc.net

    /*====================================================================*
     *
     *   Copyright (c) 2013 Qualcomm Atheros, Inc.
     *
     *   All rights reserved.
     *
     *   Redistribution and use in source and binary forms, with or
     *   without modification, are permitted (subject to the limitations
     *   in the disclaimer below) provided that the following conditions
     *   are met:
     *
     *   * Redistributions of source code must retain the above copyright
     *     notice, this list of conditions and the following disclaimer.
     *
     *   * 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.
     *
     *   * Neither the name of Qualcomm Atheros nor the names of
     *     its contributors may be used to endorse or promote products
     *     derived from this software without specific prior written
     *     permission.
     *
     *   NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE
     *   GRANTED BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE
     *   COPYRIGHT HOLDERS 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 COPYRIGHT OWNER
     *   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.
     *
     *--------------------------------------------------------------------*/

    /*====================================================================*
     *
     *   char * pcap_indextoname (unsigned ifindex, char * ifname);
     *
     *   ether.h
     *
     *   a WinPcap version of POSIX if_indextoname function; return error
     *   in non-pcap environments; set errno to ENXIO on error on MacOSX;
     *
     *   see The Open Group Base Specifications Issue 6 IEEE Std 1003.1,
     *   2004 Edition for a description of this function;
     *
     *
     *--------------------------------------------------------------------*/

    #ifndef PCAP_INDEXTONAME_SOURCE
    #define PCAP_INDEXTONAME_SOURCE

    #include <pcap.h>
    #include <string.h>
    #include <errno.h>

    #include "../ether/ether.h"

    char * pcap_indextoname (unsigned ifindex, char * ifname)

    {

    #if defined (WINPCAP) || defined (LIBPCAP)

    	char buffer [PCAP_ERRBUF_SIZE];
    	pcap_if_t * devices = (pcap_if_t *)(0);
    	pcap_if_t * device;
    	if ((index--) && (pcap_findalldevs (&devices, buffer) != -1))
    	{
    		for (device = devices; device; device = device->next)
    		{
    			if (!index--)
    			{
    				memcpy (ifname, device->name, strlen (device->name));
    				pcap_freealldevs (devices);
    				return (ifname);
    			}
    		}
    		pcap_freealldevs (devices);
    	}

    #endif
    #if defined (__APPLE__)

    	errno = ENXIO;

    #endif

    	return ((char *)(0));
    }

    #endif

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