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

    /*====================================================================*
     *
     *   hpavd.c - Qualcomm Atheros Homeplug AV Packet Daemon;
     *
     *   prints incoming Qualcomm Atheros HomePlug AV vendor-specific
     *   management messages on stdout in hex dump format for analysis;
     *
     *   the program can be run in foreground or background, as a daemon;
     *
     *   this program receives raw ethernet frames and so requires root
     *   privileges; if you install it using "chmod 555" and "chown
     *   root:root" then you must login as root to run it; otherwise, you
     *   can install it using "chmod 4555" and "chown root:root" so that
     *   anyone can run it; the program will refuse to run until you get
     *   thing right;
     *
     *
     *   Contributor(s):
     *      Charles Maier <cmaier@qca.qualcomm.com>
     *
     *--------------------------------------------------------------------*/

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

    #include <fcntl.h>
    #include <stdio.h>
    #include <ctype.h>
    #include <unistd.h>
    #include <stdint.h>
    #include <stdlib.h>
    #include <string.h>
    #include <sys/signal.h>
    #include <sys/ioctl.h>
    #include <errno.h>

    #ifdef __linux__
    #include <net/if.h>
    #include <net/if_arp.h>
    #include <netpacket/packet.h>
    #include <signal.h>
    #endif

    /*====================================================================*
     *   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/error.h"
    #include "../plc/plc.h"
    #include "../mme/mme.h"

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

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

    #ifndef MAKEFILE
    #include "../mme/MMEPeek.c"
    #include "../mme/MMEName.c"
    #include "../mme/MMEMode.c"
    #endif

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

    #define HPAVD_DAEMON (1 << 0)
    #define HPAVD_VERBOSE (1 << 1)
    #define HPAVD_SILENCE (1 << 2)
    #define HPAVD_ERROR (1 << 3)

    #define PLCDEVICE "PLC"
    #define ETHDEVICE "eth1"
    #define ETHNUMBER 2

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

    static bool done = false;

    /*====================================================================*
     *
     *   void terminate (signo_t signal);
     *
     *   terminate the program; we want to ensure an orgaized program
     *   exit so that the original Ethernet adapter state is restored;
     *
     *
     *--------------------------------------------------------------------*/

    static void terminate (signo_t signal)

    {
    	done = true;
    	return;
    }

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

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

    {
    	struct sigaction sa;
    	struct ifreq ifreq;
    	struct sockaddr_ll sockaddr =
    	{
    		PF_PACKET,
    		htons (ETH_P_HPAV),
    		0x0000,
    		ARPHRD_ETHER,
    		PACKET_OTHERHOST,
    		ETHER_ADDR_LEN,
    		{
    			0x00,
    			0x00,
    			0x00,
    			0x00,
    			0x00,
    			0x00,
    			0x00,
    			0x00
    		}
    	};
    	static char const * optv [] =
    	{
    		"di:qv",
    		PUTOPTV_S_DIVINE,
    		"Qualcomm Atheros HomePlug AV Packet Daemon",
    		"d\trun in background as daemon",
    		"i s\thost interface is (s) [" ETHDEVICE "]",
    		"q\tsuppress normal output",
    		"v\tverbose messages on stdout",
    		(char const *) (0)
    	};
    	uint8_t packet [ETHER_MAX_LEN];
    	flag_t state = (flag_t)(0);
    	flag_t flags = (flag_t)(0);
    	sock_t fd = -1;
    	signed c;
    	memset (&ifreq, 0, sizeof (ifreq));
    	memcpy (ifreq.ifr_name, ETHDEVICE, sizeof (ETHDEVICE));
    	if (getenv (PLCDEVICE))
    	{
    		memcpy (ifreq.ifr_name, getenv (PLCDEVICE), sizeof (ifreq.ifr_name));
    	}
    	optind = 1;
    	while ((c = getoptv (argc, argv, optv)) != -1)
    	{
    		switch ((char) (c))
    		{
    		case 'd':
    			_setbits (flags, HPAVD_DAEMON);
    			break;
    		case 'i':
    			memcpy (ifreq.ifr_name, optarg, sizeof (ifreq.ifr_name));
    			break;
    		case 'q':
    			_setbits (flags, HPAVD_SILENCE);
    			break;
    		case 'v':
    			_setbits (flags, HPAVD_VERBOSE);
    			break;
    		default:
    			break;
    		}
    	}
    	argc -= optind;
    	argv += optind;
    	if (geteuid ())
    	{
    		error (1, EPERM, ERROR_NOTROOT);
    	}
    	if (_anyset (flags, HPAVD_DAEMON))
    	{
    		pid_t pid = fork ();
    		if (pid < 0)
    		{
    			error (1, errno, "razzlefrats!");
    		}
    		if (pid > 0)
    		{
    			exit (0);
    		}
    	}
    	memset (&sa, 0, sizeof (struct sigaction));
    	sa.sa_handler = terminate;
    	sigaction (SIGTERM, &sa, (struct sigaction *)(0));
    	sigaction (SIGQUIT, &sa, (struct sigaction *)(0));
    	sigaction (SIGTSTP, &sa, (struct sigaction *)(0));
    	sigaction (SIGINT, &sa, (struct sigaction *)(0));
    	sigaction (SIGHUP, &sa, (struct sigaction *)(0));
    	if ((fd = socket (sockaddr.sll_family, SOCK_RAW, sockaddr.sll_protocol)) == -1)
    	{
    		error (1, errno, "Can't create socket for %s", ifreq.ifr_name);
    	}
    	if (ioctl (fd, SIOCGIFFLAGS, &ifreq) < 0)
    	{
    		error (1, errno, "Can't read %s device state", ifreq.ifr_name);
    	}
    	state = ifreq.ifr_flags;
    	_setbits (ifreq.ifr_flags, (IFF_UP | IFF_BROADCAST));
    	_clrbits (ifreq.ifr_flags, (IFF_MULTICAST | IFF_ALLMULTI | IFF_PROMISC));
    	if (ioctl (fd, SIOCSIFFLAGS, &ifreq) < 0)
    	{
    		error (1, errno, "Can't change %s device state", ifreq.ifr_name);
    	}
    	if (ioctl (fd, SIOCGIFINDEX, &ifreq) == -1)
    	{
    		error (1, errno, "Can't get %s interface index", ifreq.ifr_name);
    	}
    	sockaddr.sll_ifindex = ifreq.ifr_ifindex;
    	if (ioctl (fd, SIOCGIFHWADDR, &ifreq) == -1)
    	{
    		error (1, errno, "Can't get %s hardware address", ifreq.ifr_name);
    	}
    	memcpy (sockaddr.sll_addr, ifreq.ifr_ifru.ifru_hwaddr.sa_data, sizeof (sockaddr.sll_addr));
    	if (bind (fd, (struct sockaddr *) (&sockaddr), sizeof (struct sockaddr_ll)) == -1)
    	{
    		error (1, errno, "Can't bind socket to %s", ifreq.ifr_name);
    	}
    	while (!done)
    	{
    		signed length = recvfrom (fd, packet, sizeof (packet), 0, (struct sockaddr *) (0), (socklen_t *)(0));
    		if (length > 0)
    		{
    			if (_allclr (flags, HPAVD_SILENCE))
    			{
    				MMEPeek (&packet, length, stdout);
    			}
    			if (_anyset (flags, HPAVD_VERBOSE))
    			{
    				hexdump (&packet, 0, length, stdout);
    			}
    		}
    	}
    	ifreq.ifr_flags = state;
    	if (ioctl (fd, SIOCSIFFLAGS, &ifreq) < 0)
    	{
    		error (1, errno, "Can't restore %s device state", ifreq.ifr_name);
    	}
    	close (fd);
    	return (0);
    }

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