    /*====================================================================*
     *
     *   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.
     *
     *--------------------------------------------------------------------*/

    /*====================================================================*
     *
     *   efbu.c - Ethernet Frame Blast Utility;
     *
     *   transmit an IP broadcast frame of maximum length at maximum rate
     *   for a given period of time in seconds;
     *
     *
     *--------------------------------------------------------------------*/

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

    #include <stdlib.h>
    #include <string.h>
    #include <limits.h>
    #include <time.h>
    #include <sys/time.h>

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

    #include "../tools/getoptv.h"
    #include "../tools/putoptv.h"
    #include "../tools/error.h"
    #include "../tools/memory.h"
    #include "../tools/number.h"
    #include "../tools/symbol.h"
    #include "../tools/flags.h"
    #include "../ether/channel.h"

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

    #ifndef MAKEFILE
    #include "../tools/getoptv.c"
    #include "../tools/putoptv.c"
    #include "../tools/version.c"
    #include "../tools/error.c"
    #include "../tools/basespec.c"
    #include "../tools/uintspec.c"
    #include "../tools/hexencode.c"
    #include "../tools/hexdump.c"
    #include "../tools/todigit.c"
    #endif

    #ifndef MAKEFILE
    #include "../ether/openchannel.c"
    #include "../ether/closechannel.c"
    #include "../ether/readpacket.c"
    #include "../ether/sendpacket.c"
    #include "../ether/channel.c"
    #endif

    /*====================================================================*
     *   program contants;
     *--------------------------------------------------------------------*/

    #define EFBU_VLAN_TAG 0
    #define EFBU_INTERFACE "PLC"
    #define EFBU_ETHERTYPE ETH_P_802_2
    #define EFBU_BINARY 0xAA
    #define EFBU_TIMER 1000
    #define EFBU_PAUSE 50

    #ifndef ETHER_CRC_LEN
    #define ETHER_CRC_LEN 4
    #endif

    #if defined (WIN32)
    #define SLEEP(milliseconds) Sleep(milliseconds)
    #else
    #define SLEEP(milliseconds) usleep(1000*(milliseconds))
    #endif

    /*====================================================================*
     *
     *   void function (struct channel * channel, void * memory, unsigned extent, unsigned timer, unsigned pause);
     *
     *   transmit an IP broadcast frame of given length at maximum rate
     *   for a given period of time in seconds;
     *
     *
     *--------------------------------------------------------------------*/

    static void function (struct channel * channel, void * memory, ssize_t extent, byte binary, unsigned timer, unsigned pause)

    {

    #if EFBU_VLAN_TAG

    	struct ether_header
    	{
    		uint8_t ether_dhost [ETH_ALEN];
    		uint8_t ether_shost [ETH_ALEN];
    		uint32_t ether_vlan;
    		uint16_t ether_type;
    	}
    	__attribute__ ((__packed__)) * frame = (struct ether_header *)(memory);

    #else

    	struct ether_header * frame = (struct ether_header *)(memory);

    #endif

    	struct timeval ts;
    	struct timeval tc;
    	unsigned since;
    	memset (memory, binary, extent);
    	if (extent > (ETHER_MAX_LEN - ETHER_CRC_LEN))
    	{
    		extent = ETHER_MAX_LEN - ETHER_CRC_LEN;
    	}
    	memcpy (frame->ether_dhost, channel->peer, sizeof (frame->ether_dhost));
    	memcpy (frame->ether_shost, channel->host, sizeof (frame->ether_shost));

    #if EFBU_VLAN_TAG

    	frame->ether_vlan = htonl (0x8100A000);

    #endif

    	frame->ether_type = htons (channel->type);
    	if (gettimeofday (&ts, NULL) == -1)
    	{
    		error (1, errno, CANT_START_TIMER);
    	}
    	for (since = 0; since < timer; since = (tc.tv_sec - ts.tv_sec) * 1000 + ((tc.tv_usec - ts.tv_usec) / 1000))
    	{
    		sendpacket (channel, memory, extent);
    		if (gettimeofday (&tc, NULL) == -1)
    		{
    			error (1, errno, CANT_RESET_TIMER);
    		}
    		SLEEP (pause);
    	}
    	return;
    }

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

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

    {
    	extern struct channel channel;
    	static char const * optv [] =
    	{
    		"b:d:e:hi:p:t:v",
    		"",
    		"Ethernet Frame Blast Utility",
    		"b n\tbinary byte value is (n) [" LITERAL (EFBU_BINARY) "]",
    		"d x\treplace destination address with (x)",
    		"e x\tethertype is (x) [" LITERAL (EFBU_ETHERTYPE) "]",
    		"h\treplace source address with host address",

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

    		"i n\thost interface is (n) [" LITERAL (CHANNEL_ETHNUMBER) "]",

    #else

    		"i s\thost interface is (s) [" LITERAL (CHANNEL_ETHDEVICE) "]",

    #endif

    		"t n\ttransmit for (n) milliseconds [" LITERAL (EFBU_TIMER) "]",
    		"p n\tpause (n) milliseconds between frames [" LITERAL (EFBU_PAUSE) "]",
    		"v\tverbose messages",
    		(char const *) (0)
    	};
    	byte buffer [ETHER_MAX_LEN];
    	byte binary = EFBU_BINARY;
    	unsigned timer = EFBU_TIMER;
    	unsigned pause = EFBU_PAUSE;
    	signed c;
    	if (getenv (EFBU_INTERFACE))
    	{

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

    		channel.ifindex = atoi (getenv (EFBU_INTERFACE));

    #else

    		channel.ifname = strdup (getenv (EFBU_INTERFACE));

    #endif

    	}
    	optind = 1;
    	memset (channel.peer, 0xFF, sizeof (channel.peer));
    	memset (channel.host, 0xFF, sizeof (channel.host));
    	channel.type = EFBU_ETHERTYPE;
    	while ((c = getoptv (argc, argv, optv)) != -1)
    	{
    		switch (c)
    		{
    		case 'b':
    			binary = (uint8_t)(uintspec (optarg, 0, 255));
    			break;
    		case 'd':
    			_setbits (channel.flags, CHANNEL_UPDATE_TARGET);
    			if (!hexencode (channel.peer, sizeof (channel.peer), optarg))
    			{
    				error (1, errno, "%s", optarg);
    			}
    			break;
    		case 'e':
    			channel.type = (uint16_t)(basespec (optarg, 16, sizeof (channel.type)));
    			break;
    		case 'h':
    			_setbits (channel.flags, CHANNEL_UPDATE_SOURCE);
    			break;
    		case 'i':

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

    			channel.ifindex = atoi (optarg);

    #else

    			channel.ifname = optarg;

    #endif

    			break;
    		case 'p':
    			pause = (unsigned)(uintspec (optarg, 0, UINT_MAX));
    			break;
    		case 'q':
    			_setbits (channel.flags, CHANNEL_SILENCE);
    			break;
    		case 't':
    			timer = (unsigned)(uintspec (optarg, 0, UINT_MAX));
    			break;
    		case 'v':
    			_setbits (channel.flags, CHANNEL_VERBOSE);
    			break;
    		default:
    			break;
    		}
    	}
    	argc -= optind;
    	argv += optind;
    	if (argc)
    	{
    		error (1, ECANCELED, ERROR_TOOMANY);
    	}
    	openchannel (&channel);
    	function (&channel, buffer, sizeof (buffer), binary, timer, pause);
    	closechannel (&channel);
    	return (0);
    }

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