getifname.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 * getifname (signed number);
     *
     *   ether.h
     *
     *   return the PCAP interface name for a given interface number; this
     *   function is only needed when using LIBPCAP or WINPCAP libraries;
     *
     *
     *   Contributor(s):
     *      Nathaniel Houghton <nhoughto@qca.qualcomm.com>
     *      Charles Maier <cmaier@qca.qualcomm.com>
     *
     *--------------------------------------------------------------------*/

    #ifndef GETIFNAME_SOURCE
    #define GETIFNAME_SOURCE

    #include <string.h>

    #if defined (WINPCAP) || defined (LIBPCAP)
    #include <pcap.h>
    #endif

    #include "../ether/ether.h"
    #include "../tools/error.h"

    char * getifname (signed index)

    {
    	char * name = (char *)(0);

    #if defined (__linux__)

    #elif defined (__APPLE__) || defined (__OpenBSD__)

    #elif defined (WINPCAP) || defined (LIBPCAP)

    	char buffer [PCAP_ERRBUF_SIZE];
    	pcap_if_t *devices = (pcap_if_t *)(0);
    	pcap_if_t *device;
    	signed count;
    	if (pcap_findalldevs (&devices, buffer) == -1)
    	{
    		error (1, errno, "can't enumerate pcap devices");
    	}
    	for (device = devices, count = 1; device; device = device->next, count++)
    	{
    		if (count == index)
    		{
    			name = strdup (device->name);
    			break;
    		}
    	}
    	if (!device)
    	{
    		error (1, EINVAL, "invalid interface: %d", index);
    	}
    	pcap_freealldevs (devices);

    #else
    #error "Unknown environment"
    #endif

    	return (name);
    }

    #endif

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