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

    /*====================================================================*
     *
     *   efsu.c - Ethernet Frame Send Utility;
     *
     *   convert hexadecimal text files to ethernet frames and transmit
     *   them over the network; basically, it is a 'send your own frame'
     *   utility;
     *
     *   the program works like cat, sending file after file to a given
     *   interface; as each file is read, all hexadecimal octets in the
     *   file are converted to bytes and buffered; a semicolon causes a
     *   buffer transmit as does the end of file; script-style comments
     *   starting with hash (#) and c-language-style comments starting
     *   with slash-slash or slash-asterisk are consumed and discard as
     *   the file is read; the errors that can occur are non-hex digits
     *   and odd number of hex digits;
     *
     *
     *--------------------------------------------------------------------*/

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

    #include <stdlib.h>
    #include <string.h>
    #include <limits.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/hexencode.c"
    #include "../tools/hexload.c"
    #include "../tools/hexdump.c"
    #include "../tools/todigit.c"
    #include "../tools/uintspec.c"
    #include "../tools/basespec.c"
    #include "../tools/synonym.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 EFSU_INTERFACE "PLC"
    #define EFSU_ETHERTYPE 0x88E1
    #define EFSU_PAUSE 0
    #define EFSU_DELAY 0
    #define EFSU_LOOP 1

    #ifndef ETHER_CRC_LEN
    #define ETHER_CRC_LEN 4
    #endif

    /*====================================================================*
     *   program variables;
     *--------------------------------------------------------------------*/

    static const struct _term_ protocols [] =

    {
    	{
    		"hp10",
    		"887B"
    	},
    	{
    		"hpav",
    		"88E1"
    	}
    };

    /*====================================================================*
     *
     *   void function (struct channel * channel, void * memory, ssize_t extent);
     *
     *   read Ethernet frame descriptions from stdin and transmit them
     *   as raw ethernet frames; wait for a response if CHANNEL_LISTEN
     *   flagword bit is set;
     *
     *
     *--------------------------------------------------------------------*/

    static void function (struct channel * channel, void * memory, ssize_t extent)

    {
    	struct ether_header * frame = (struct ether_header *)(memory);
    	unsigned length;
    	while ((length = (unsigned)(hexload (memory, extent, stdin))) > 0)
    	{
    		if (length < (ETHER_MIN_LEN - ETHER_CRC_LEN))
    		{
    			error (1, ENOTSUP, "Frame size of %d is less than %d bytes", length, (ETHER_MIN_LEN - ETHER_CRC_LEN));
    		}
    		if (length > (ETHER_MAX_LEN - ETHER_CRC_LEN))
    		{
    			error (1, ENOTSUP, "Frame size of %d is more than %d bytes", length, (ETHER_MAX_LEN - ETHER_CRC_LEN));
    		}
    		if (_anyset (channel->flags, CHANNEL_UPDATE_TARGET))
    		{
    			memcpy (frame->ether_dhost, channel->peer, sizeof (frame->ether_dhost));
    		}
    		if (_anyset (channel->flags, CHANNEL_UPDATE_SOURCE))
    		{
    			memcpy (frame->ether_shost, channel->host, sizeof (frame->ether_shost));
    		}
    		sendpacket (channel, memory, length);
    		if (_anyset (channel->flags, CHANNEL_LISTEN))
    		{
    			while (readpacket (channel, memory, extent) > 0);
    		}
    	}
    	return;
    }

    /*====================================================================*
     *
     *   void iterate (int argc, char const * argv [], void * memory, ssize_t extent, unsigned pause);
     *
     *
     *
     *--------------------------------------------------------------------*/

    static void iterate (int argc, char const * argv [], struct channel * channel, unsigned pause)

    {
    	byte buffer [ETHER_MAX_LEN];
    	if (!argc)
    	{
    		function (channel, buffer, sizeof (buffer));
    	}
    	while ((argc) && (* argv))
    	{
    		if (!freopen (* argv, "rb", stdin))
    		{
    			error (1, errno, "Can't open %s", * argv);
    		}
    		function (channel, buffer, sizeof (buffer));
    		argc--;
    		argv++;
    		if ((argc) && (* argv))
    		{
    			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 [] =
    	{
    		"d:e:hi:l:p:t:vw:",
    		PUTOPTV_S_FUNNEL,
    		"Ethernet Frame Send Utility",
    		"d x\treplace destination address with (x)",
    		"e x\techo return frames having ethertype (x) [" LITERAL (EFSU_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

    		"l n\trepeat file sequence (n) times [" LITERAL (EFSU_LOOP) "]",
    		"p n\twait (n) seconds between files [" LITERAL (EFSU_PAUSE) "]",
    		"t n\tread timeout is (n) milliseconds [" LITERAL (CHANNEL_TIMEOUT) "]",
    		"v\tverbose messages",
    		"w n\twait (n) seconds between loops [" LITERAL (EFSU_DELAY) "]",
    		(char const *) (0)
    	};
    	unsigned pause = EFSU_PAUSE;
    	unsigned delay = EFSU_DELAY;
    	unsigned loop = EFSU_LOOP;
    	signed c;
    	channel.type = EFSU_ETHERTYPE;
    	if (getenv (EFSU_INTERFACE))
    	{

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

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

    #else

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

    #endif

    	}
    	optind = 1;
    	while ((c = getoptv (argc, argv, optv)) != -1)
    	{
    		switch (c)
    		{
    		case 'd':
    			_setbits (channel.flags, CHANNEL_UPDATE_TARGET);
    			if (!hexencode (channel.peer, sizeof (channel.peer), optarg))
    			{
    				error (1, errno, "%s", optarg);
    			}
    			break;
    		case 'e':
    			_setbits (channel.flags, CHANNEL_LISTEN);
    			channel.type = (uint16_t)(basespec (synonym (optarg, protocols, SIZEOF (protocols)), 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 'l':
    			loop = (unsigned)(uintspec (optarg, 0, UINT_MAX));
    			break;
    		case 'p':
    			pause = (unsigned)(uintspec (optarg, 0, 1200));
    			break;
    		case 'q':
    			_setbits (channel.flags, CHANNEL_SILENCE);
    			break;
    		case 't':
    			channel.timeout = (signed)(uintspec (optarg, 0, UINT_MAX));
    			break;
    		case 'v':
    			_setbits (channel.flags, CHANNEL_VERBOSE);
    			break;
    		case 'w':
    			delay = (unsigned)(uintspec (optarg, 0, 1200));
    			break;
    		default:
    			break;
    		}
    	}
    	argc -= optind;
    	argv += optind;
    	openchannel (&channel);
    	while (loop--)
    	{
    		iterate (argc, argv, &channel, pause);
    		if (loop)
    		{
    			sleep (delay);
    		}
    	}
    	closechannel (&channel);
    	return (0);
    }

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