LocalDevices.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.
     *
     *--------------------------------------------------------------------*/

    /*====================================================================*
     *
     *   unsigned LocalDevices (struct channel * channel,  struct message * message, void * memory, size_t extent);
     *
     *   plc.h
     *
     *   populate a memory region with consecutive Ethernet addresses;
     *   the addresses belong to Atheros powerline devices connected to
     *   the host interface specified in struct channel; each bridge may
     *   be connected to one or more HomePlug AV devices via powerline;
     *
     *   each powerline bridge normally belongs to a different powerline
     *   network but is is possible for multiple bridges to belong to the
     *   same powerline network thus leading to confusing configurations;
     *
     *   use function NetworkDevices() to discover all devices on each
     *   powerline network;
     *
     *   although this function accepts a channel structure, it ignores
     *   the channel peer address and sends a VS_SW_VER request message
     *   to the Local Management Address; this causes all local devices
     *   to respond; the list is a collection of source addresses taken
     *   from all responses;
     *
     *
     *   Contributor(s):
     *      Charles Maier <cmaier@qca.qualcomm.com>
     *      Matthieu Poullet <m.poullet@avm.de>
     *
     *--------------------------------------------------------------------*/

    #ifndef NETWORKBRIDGES_SOURCE
    #define NETWORKBRIDGES_SOURCE

    #include <memory.h>
    #include <errno.h>

    #include "../plc/plc.h"
    #include "../ether/channel.h"
    #include "../tools/types.h"
    #include "../tools/error.h"

    unsigned LocalDevices (struct channel const * channel, struct message * message, void * memory, size_t extent)

    {
    	extern const byte localcast [ETHER_ADDR_LEN];
    	struct vs_sw_ver_request
    	{
    		struct ethernet_hdr ethernet;
    		struct qualcomm_hdr qualcomm;
    	}
    	* request = (struct vs_sw_ver_request *)(message);
    	uint8_t * origin = (uint8_t *)(memory);
    	uint8_t * offset = (uint8_t *)(memory);
    	ssize_t packetsize;
    	memset (memory, 0, extent);
    	memset (message, 0, sizeof (* message));
    	EthernetHeader (&request->ethernet, localcast, channel->host, channel->type);
    	QualcommHeader (&request->qualcomm, 0, (VS_SW_VER | MMTYPE_REQ));
    	if (sendpacket (channel, message, (ETHER_MIN_LEN - ETHER_CRC_LEN)) <= 0)
    	{
    		return (0);
    	}
    	while ((packetsize = readpacket (channel, message, sizeof (* message))) > 0)
    	{
    		if (UnwantedMessage (message, packetsize, 0, (VS_SW_VER | MMTYPE_CNF)))
    		{
    			continue;
    		}
    		if (extent >= sizeof (message->ethernet.OSA))
    		{
    			memcpy (offset, message->ethernet.OSA, sizeof (message->ethernet.OSA));
    			offset += sizeof (message->ethernet.OSA);
    			extent -= sizeof (message->ethernet.OSA);
    		}
    	}
    	return ((unsigned)(offset - origin) / ETHER_ADDR_LEN);
    }

    #endif

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