pcapdevs.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.
     *
     *--------------------------------------------------------------------*/

    /*====================================================================*
     *
     *   pcapdevs.c - pcap device enumerator;
     *
     *
     *   Contributor(s):
     *      Nathaniel Houghton <nhoughto@qca.qualcomm.com>
     *	Charles Maier <cmaier@qca.qualcomm.com>
     *
     *--------------------------------------------------------------------*/

    /*====================================================================*
     *   system header files;
     *--------------------------------------------------------------------*/

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

    #if defined (__linux__)
    #elif defined (__APPLE__)
    #elif defined (__OpenBSD__)
    #	include <sys/types.h>
    #	include <sys/socket.h>
    #	include <net/if.h>
    #	include <netinet/in.h>
    #	include <netinet/if_ether.h>
    #elif defined (WINPCAP) || defined (LIBPCAP)
    #else
    #error "Unknown environment"
    #endif

    /*====================================================================*
     *   custom header files;
     *--------------------------------------------------------------------*/

    #include "../tools/getoptv.h"
    #include "../tools/putoptv.h"
    #include "../tools/version.h"
    #include "../tools/memory.h"
    #include "../tools/flags.h"
    #include "../tools/types.h"
    #include "../tools/error.h"
    #include "../ether/ether.h"

    /*====================================================================*
     *   custom source files;
     *--------------------------------------------------------------------*/

    #ifndef MAKEFILE
    #include "../tools/getoptv.c"
    #include "../tools/putoptv.c"
    #include "../tools/version.c"
    #include "../tools/error.c"
    #include "../tools/hexdecode.c"
    #endif

    /*====================================================================*
     *   program constants;
     *--------------------------------------------------------------------*/

    #define PCAP_VERBOSE (1 << 0)
    #define PCAP_SILENCE (1 << 1)
    #define PCAP_DEVICES (1 << 2)
    #define PCAP_NICS (1 << 3)
    #define PCAP_MACS (1 << 4)

    /*====================================================================*
     *
     *   void pcap_enum (flag_t flags);
     *
     *   pcap_enum available pcap devices on stdout;
     *
     *
     *   Contributor(s):
     *      Nathaniel Houghton <nhoughto@qca.qualcomm.com>
     *
     *--------------------------------------------------------------------*/

    void pcap_enum (flag_t flags)

    {
    	char report [PCAP_ERRBUF_SIZE];
    	char string [ETHER_ADDR_LEN * 3];
    	byte number [ETHER_ADDR_LEN];
    	pcap_if_t * device;
    	pcap_if_t * devices = (pcap_if_t *)(0);
    	unsigned index;
    	if (pcap_findalldevs (&devices, report) == -1)
    	{
    		error (1, 0, "Can't enumerate interfaces");
    	}
    	if (!devices)
    	{
    		error (1, 0, "No interfaces available");
    	}
    	if (_anyset (flags, PCAP_DEVICES))
    	{
    		for (device = devices, index = 1; device; device = device->next, index++)
    		{
    			gethwaddr (number, device->name);
    			hexdecode (number, sizeof (number), string, sizeof (string));
    			printf ("%2d %s %s", index, string, device->name);
    			if (device->description)
    			{
    				printf ("\t(%s)", device->description);
    			}
    			printf ("\n");
    		}
    	}
    	if (_anyset (flags, PCAP_NICS))
    	{
    		for (device = devices, index = 1; device; device = device->next, index++)
    		{

    #if defined (WIN32)

    			printf ("ETH%d=%d", index, index);

    #else

    			printf ("ETH%d=%s", index, device->name);

    #endif

    			if (device->description)
    			{
    				printf ("\t# %s", device->description);
    			}
    			printf ("\n");
    		}
    		printf ("\n");
    	}
    	if (_anyset (flags, PCAP_MACS))
    	{
    		for (device = devices, index = 1; device; device = device->next, index++)
    		{
    			gethwaddr (number, device->name);
    			hexdecode (number, sizeof (number), string, sizeof (string));
    			printf ("NIC%d=%s", index, string);
    			if (device->description)
    			{
    				printf ("\t# %s", device->description);
    			}
    			printf ("\n");
    		}
    		printf ("\n");
    	}
    	pcap_freealldevs (devices);
    	return;
    }

    /*====================================================================*
     *
     *   int main (int argc, char const * argv [])
     *
     *
     *--------------------------------------------------------------------*/

    int main (int argc, char const * argv [])

    {
    	static char const * optv [] =
    	{
    		"hqv",
    		"",
    		"enumerate available pcap devices on stdout",
    		"h\tprint host definitions for scripting",
    		"q\tquiet",
    		"v\tverbose messages",
    		(char const *) (0)
    	};
    	flag_t flags = PCAP_DEVICES;
    	signed c;
    	optind = 1;
    	while ((c = getoptv (argc, argv, optv)) != -1)
    	{
    		switch ((char) (c))
    		{
    		case 'h':
    			_clrbits (flags, (PCAP_DEVICES));
    			_setbits (flags, (PCAP_NICS | PCAP_MACS));
    			break;
    		case 'q':
    			_setbits (flags, PCAP_SILENCE);
    			break;
    		case 'v':
    			_setbits (flags, PCAP_VERBOSE);
    			break;
    		default:
    			break;
    		}
    	}
    	argc -= optind;
    	argv += optind;
    	if (argc)
    	{
    		error (1, ECANCELED, ERROR_TOOMANY);
    	}
    	pcap_enum (flags);
    	return (0);
    }

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