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

    /*====================================================================*
     *
     *   pev.c - QCA Plug-in Electric Vehicle Emulator;
     *
     *   This program, in the current state, is not a finished product;
     *   It has been released so that interested parties can begin to
     *   see how the SLAC protocol might be implemented;
     *
     *   Some key design features are:
     *
     *   1) the use of a channel variable to abstract ISO Layer 2 I/O;
     *      the variable is used by functions openchannel, readmessage,
     *      sendmessage and closechannel;
     *
     *   2) the use of a message variable to represent an IEEE 802.3
     *      Ethernet frame; the variable allows one frame to be used
     *      and re-used throughout the program but supports multiple
     *      frame buffers if needed;
     *
     *   3) the use of a session variable to support multiple PEV-EVSE
     *      interactions without using threads or subrocesses; this has
     *      not demonstrated in this version of the program; some more
     *      work is needed;
     *
     *   4) the absence of threads or subprocesses so that the  program
     *      can be ported to hosts without a multi-tasking operating
     *      system;
     *
     *   5) lots of debugging messages; these can be suppressed or
     *      deleted if not wanted;
     *
     *   6) simplified state machine;
     *
     *--------------------------------------------------------------------*/

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

    #include <unistd.h>
    #include <stdlib.h>
    #include <limits.h>
    #include <string.h>
    #include <errno.h>
    #include <time.h>

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

    #include "../tools/getoptv.h"
    #include "../tools/putoptv.h"
    #include "../tools/memory.h"
    #include "../tools/number.h"
    #include "../tools/types.h"
    #include "../tools/flags.h"
    #include "../tools/files.h"
    #include "../tools/error.h"
    #include "../tools/config.h"
    #include "../ether/channel.h"
    #include "../iso15118/slac.h"

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

    #ifndef MAKEFILE
    #include "../tools/getoptv.c"
    #include "../tools/putoptv.c"
    #include "../tools/version.c"
    #include "../tools/hexdump.c"
    #include "../tools/hexdecode.c"
    #include "../tools/hexencode.c"
    #include "../tools/hexstring.c"
    #include "../tools/decdecode.c"
    #include "../tools/decstring.c"
    #include "../tools/uintspec.c"
    #include "../tools/todigit.c"
    #include "../tools/strfbits.c"
    #include "../tools/config.c"
    #include "../tools/memincr.c"
    #include "../tools/error.c"
    #endif

    #ifndef MAKEFILE
    #include "../plc/Devices.c"
    #endif

    #ifndef MAKEFILE
    #include "../mme/EthernetHeader.c"
    #include "../mme/QualcommHeader.c"
    #include "../mme/HomePlugHeader1.c"
    #include "../mme/UnwantedMessage.c"
    #include "../mme/readmessage.c"
    #include "../mme/sendmessage.c"
    #endif

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

    #ifndef MAKEFILE
    #include "../iso15118/slac_session.c"
    #include "../iso15118/slac_connect.c"
    #include "../iso15118/slac_debug.c"
    #include "../iso15118/pev_cm_slac_param.c"
    #include "../iso15118/pev_cm_start_atten_char.c"
    #include "../iso15118/pev_cm_atten_char.c"
    #include "../iso15118/pev_cm_mnbc_sound.c"
    #include "../iso15118/pev_cm_slac_match.c"
    #include "../iso15118/pev_cm_set_key.c"
    #endif

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

    #define PLCDEVICE "PLC"
    #define PROFILE "pev.ini"
    #define SECTION "default"

    #define PEV_STATE_DISCONNECTED 1
    #define PEV_STATE_UNMATCHED 2
    #define PEV_STATE_MATCHED 3

    #define PEV_VID "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA" // VehicleIdentifier
    #define PEV_NMK "50D3E4933F855B7040784DF815AA8DB7"   // HomePlugAV
    #define PEV_NID "B0F2E695666B03"		     // HomePlugAV

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

    unsigned state = 0;

    /*====================================================================*
     *
     *   static void configure ();
     *
     *   print template PEV-HLE configuration file on stdout so that
     *   profile, section and element names match;
     *
     *--------------------------------------------------------------------*/

    static void configure ()

    {
    	printf ("# file: %s\n", PROFILE);
    	printf ("# ====================================================================\n");
    	printf ("# PEV-HLE initialization;\n");
    	printf ("# --------------------------------------------------------------------\n");
    	printf ("[%s]\n", SECTION);
    	printf ("vehicle identifier = %s\n", PEV_VID);
    	printf ("network membership key = %s\n", PEV_NMK);
    	printf ("network identifier = %s\n", PEV_NID);
    	printf ("attenuation threshold = %d\n", SLAC_LIMIT);
    	printf ("msound pause = %d\n", SLAC_PAUSE);
    	printf ("charge time = %d\n", SLAC_CHARGETIME);
    	printf ("settle time = %d\n", SLAC_SETTLETIME);
    	return;
    }

    /*====================================================================*
     *
     *   void initialize (struct session * session, char const * profile, char const * section);
     *
     *   read PEV-HLE configuration profile; initialize session variable;
     *
     *--------------------------------------------------------------------*/

    static void initialize (struct session * session, char const * profile, char const * section)

    {
    	session->next = session->prev = session;
    	hexencode (session->PEV_ID, sizeof (session->PEV_ID), configstring (profile, section, "VehicleIdentifier", PEV_VID));
    	hexencode (session->NMK, sizeof (session->NMK), configstring (profile, section, "NetworkMembershipKey", PEV_NMK));
    	hexencode (session->NID, sizeof (session->NID), configstring (profile, section, "NetworkIdentifier", PEV_NID));
    	session->limit = confignumber_range (profile, section, "AttenuationThreshold", SLAC_LIMIT, 0, UINT_MAX);
    	session->pause = confignumber_range (profile, section, "MSoundPause", SLAC_PAUSE, 0, UINT_MAX);
    	session->settletime = confignumber_range (profile, section, "SettleTime", SLAC_SETTLETIME, 0, UINT_MAX);
    	session->chargetime = confignumber_range (profile, section, "ChargeTime", SLAC_CHARGETIME, 0, UINT_MAX);
    	session->state = PEV_STATE_DISCONNECTED;
    	memcpy (session->original_nmk, session->NMK, sizeof (session->original_nmk));
    	memcpy (session->original_nid, session->NID, sizeof (session->original_nid));
    	slac_session (session);
    	return;
    }

    /*====================================================================*
     *
     *   signed identifier (struct session * session, struct channel * channel);
     *
     *   generate the run identifier and store in session variable;
     *
     *   copy channel host address to session PEV MAC address; set session
     *   PEV identifier to zeros;
     *
     *--------------------------------------------------------------------*/

    static signed identifier (struct session * session, struct channel * channel)

    {
    	time_t now;
    	time (& now);
    	memset (session->RunID, 0, sizeof (session->RunID));
    	memcpy (session->RunID, channel->host, ETHER_ADDR_LEN);
    	memcpy (session->PEV_MAC, channel->host, sizeof (session->PEV_MAC));
    	return (0);
    }

    /*====================================================================*
     *
     *   void DisconnectedState (struct session * session, struct channel * channel, struct message * message);
     *
     *--------------------------------------------------------------------*/

    static void DisconnectedState (struct session * session, struct channel * channel, struct message * message)

    {
    	slac_session (session);
    	slac_debug (session, 0, __func__, "Probing ...");
    	memincr (session->RunID, sizeof (session->RunID));
    	while (pev_cm_slac_param (session, channel, message));
    	session->state = PEV_STATE_UNMATCHED;
    	return;
    }

    /*====================================================================*
     *
     *   void MatchingState (struct session * session, struct channel * channel, struct message * message);
     *
     *   The PEV-EVSE perform GreenPPEA protocol in this state;
     *
     *   the cm_start_atten_char and cm_mnbc_sound messages are sent
     *   broadcast; the application may receive multiple cm_atten_char
     *   messages before sending the cm_slac_match message;
     *
     *--------------------------------------------------------------------*/

    static void UnmatchedState (struct session * session, struct channel * channel, struct message * message)

    {
    	slac_session (session);
    	slac_debug (session, 0, __func__, "Sounding ...");
    	if (pev_cm_start_atten_char (session, channel, message))
    	{
    		session->state = PEV_STATE_DISCONNECTED;
    		return;
    	}
    	if (pev_cm_mnbc_sound (session, channel, message))
    	{
    		session->state = PEV_STATE_DISCONNECTED;
    		return;
    	}
    	if (pev_cm_atten_char (session, channel, message))
    	{
    		session->state = PEV_STATE_DISCONNECTED;
    		return;
    	}
    	if (slac_connect (session))
    	{
    		session->state = PEV_STATE_DISCONNECTED;
    		return;
    	}
    	slac_debug (session, 0, __func__, "Matching ...");
    	if (pev_cm_slac_match (session, channel, message))
    	{
    		session->state = PEV_STATE_DISCONNECTED;
    		return;
    	}
    	session->state = PEV_STATE_MATCHED;
    	return;
    }

    /*====================================================================*
     *
     *   void MatchedState (struct session * session, struct channel * channel, struct message * message);
     *
     *   charge vehicle; restore original NMK/NID and disconnect; loop
     *   if SLAC_CONTINUE is set;
     *
     *--------------------------------------------------------------------*/

    static void MatchedState (struct session * session, struct channel * channel, struct message * message)

    {
    	slac_session (session);
    	slac_debug (session, 0, __func__, "Connecting ...");

    #if SLAC_AVLN_EVSE

    	slac_debug (session, 0, __func__, "waiting for evse to settle ...");
    	sleep (session->settletime);

    #endif
    #if SLAC_AVLN_PEV

    	if (pev_cm_set_key (session, channel, message))
    	{
    		session->state = PEV_STATE_DISCONNECTED;
    		return;
    	}
    	sleep (session->settletime);

    #endif

    	slac_debug (session, 0, __func__, "Charging (%d) ...\n\n", session->counter++);
    	sleep (session->chargetime);
    	slac_debug (session, 0, __func__, "Disconnecting ...");

    #if SLAC_AVLN_EVSE

    	slac_debug (session, 0, __func__, "waiting for evse to settle ...");
    	sleep (session->settletime);

    #endif

    #if SLAC_AVLN_PEV

    	memcpy (session->NMK, session->original_nmk, sizeof (session->NMK));
    	memcpy (session->NID, session->original_nid, sizeof (session->NID));
    	if (pev_cm_set_key (session, channel, message))
    	{
    		session->state = PEV_STATE_DISCONNECTED;
    		return;
    	}
    	sleep (session->settletime);

    #endif

    	session->state = state;
    	return;
    }

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

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

    {
    	extern struct channel channel;
    	static char const * optv [] =
    	{
    		"cCdi:lp:qs:t:vx",
    		"",
    		"Plug-in Electric Vehicle Emulator",
    		"c\tprint template configuration file on stdout",
    		"C\tstop on count mismatch",
    		"d\tdisplay debug information",

    #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\tloop indefinitely",
    		"p s\tconfiguration profile is (s) [" LITERAL (PROFILE) "]",
    		"q\tsuppress normal output",
    		"s s\tconfiguration section is (s) [" LITERAL (SECTION) "]",
    		"t n\tread timeout is (n) milliseconds [" LITERAL (SLAC_TIMEOUT) "]",
    		"v\tverbose messages on stdout",
    		"x\texit on error",
    		(char const *) (0)
    	};
    	struct session session;
    	struct message message;
    	char const * profile = PROFILE;
    	char const * section = SECTION;
    	signed c;
    	memset (& session, 0, sizeof (session));
    	memset (& message, 0, sizeof (message));
    	channel.timeout = SLAC_TIMEOUT;
    	if (getenv (PLCDEVICE))
    	{

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

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

    #else

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

    #endif

    	}
    	optind = 1;
    	while (~ (c = getoptv (argc, argv, optv)))
    	{
    		switch (c)
    		{
    		case 'c':
    			configure ();
    			return (0);
    		case 'C':
    			_setbits (session.flags, SLAC_COMPARE);
    			break;
    		case 'd':
    			_setbits (session.flags, (SLAC_VERBOSE | SLAC_SESSION));
    			break;
    		case 'i':

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

    			channel.ifindex = atoi (optarg);

    #else

    			channel.ifname = optarg;

    #endif

    			break;
    		case 'l':
    			state = PEV_STATE_DISCONNECTED;
    			break;
    		case 'p':
    			profile = optarg;
    			break;
    		case 's':
    			section = optarg;
    			break;
    		case 'q':
    			_setbits (channel.flags, CHANNEL_SILENCE);
    			_setbits (session.flags, SLAC_SILENCE);
    			break;
    		case 't':
    			channel.timeout = (unsigned) (uintspec (optarg, 0, UINT_MAX));
    			break;
    		case 'v':
    			_setbits (channel.flags, CHANNEL_VERBOSE);
    			break;
    		case 'x':
    			session.exit = session.exit? 0: 1;
    			break;
    		default:
    			break;
    		}
    	}
    	argc -= optind;
    	argv += optind;
    	if (argc)
    	{
    		slac_debug (& session, 1, __func__, ERROR_TOOMANY);
    	}
    	openchannel (& channel);
    	identifier (& session, & channel);
    	initialize (& session, profile, section);
    	if (pev_cm_set_key (& session, & channel, & message))
    	{
    		slac_debug (& session, 1, __func__, "Can't set key");
    	}
    	sleep (session.settletime);
    	while (session.state)
    	{
    		if (session.state == PEV_STATE_DISCONNECTED)
    		{
    			DisconnectedState (& session, & channel, & message);
    			continue;
    		}
    		if (session.state == PEV_STATE_UNMATCHED)
    		{
    			UnmatchedState (& session, & channel, & message);
    			continue;
    		}
    		if (session.state == PEV_STATE_MATCHED)
    		{
    			MatchedState (& session, & channel, & message);
    			continue;
    		}
    		slac_debug (& session, 1, __func__, "Illegal state!");
    	}
    	closechannel (& channel);
    	return (0);
    }

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