hostnics.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 hostnics (struct nic list [], unsigned size);
     *
     *   ether.h
     *
     *   encode an external memory region with a packed list of available
     *   nost network interfaces; return the number of interfaces found;
     *   each interface has an index, ethernet address, internet address,
     *   name and description;
     *
     *   this function is implemented for Linux and MacOSX;
     *
     *
     *   Contributor(s):
     *	Charles Maier <cmaier@qca.qualcomm.com>
     *
     *--------------------------------------------------------------------*/

    #ifndef HOSTNICS_SOURCE
    #define HOSTNICS_SOURCE

    #if defined (__linux__)
    #	include <net/if.h>
    #	include <net/ethernet.h>
    #	include <sys/ioctl.h>
    #elif defined (__linux__)
    #	include <net/if.h>
    #	include <netpacket/packet.h>
    #	include <ifaddrs.h>
    #elif defined (__APPLE__) || defined (__OpenBSD__)
    #	include <sys/types.h>
    #	include <sys/socket.h>
    #	include <net/if.h>
    #	include <net/if_dl.h>
    #	include <net/if_types.h>
    #	include <ifaddrs.h>
    #elif defined (WIN32)
    #error "Not implemented for Windows"
    #else
    #error "Unknown environment"
    #endif

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

    #include "../ether/ether.h"
    #include "../tools/error.h"

    unsigned hostnics (struct nic nics [], unsigned size)

    {

    #if defined (__linux__)

    /*
     *	native method on Linux systems;
     */

    	char buffer [1024];
    	struct ifconf ifconf;
    	struct ifreq * ifreq;
    	unsigned next;
    	signed fd;
    	memset (nics, 0, size * sizeof (struct nic));
    	ifconf.ifc_len = sizeof (buffer);
    	ifconf.ifc_buf = buffer;
    	if ((fd = socket (AF_INET, SOCK_DGRAM, 0)) < 0)
    	{
    		error (1, errno, "Can't open socket");
    	}
    	if (ioctl (fd, SIOCGIFCONF, &ifconf) < 0)
    	{
    		error (1, errno, "Can't read socket configuration");
    	}
    	ifreq = ifconf.ifc_req;
    	next = ifconf.ifc_len / sizeof (struct ifreq);
    	if (next > size)
    	{
    		next = size;
    	}
    	if (next < size)
    	{
    		size = next;
    	}
    	for (next = 0; next < size; next++)
    	{
    		struct nic * nic = &nics [next];
    		struct sockaddr_in * sockaddr_in = (struct sockaddr_in *)(&ifreq->ifr_addr);
    		memcpy (nic->ifname, ifreq->ifr_name, sizeof (nic->ifname));
    		memcpy (nic->ifdesc, ifreq->ifr_name, sizeof (nic->ifdesc));
    		memcpy (nic->internet, &sockaddr_in->sin_addr, sizeof (nic->internet));
    		if (ioctl (fd, SIOCGIFHWADDR, ifreq) == -1)
    		{
    			error (0, errno, "Can't read hardware address: %s", ifreq->ifr_name);
    		}
    		memcpy (nic->ethernet, ifreq->ifr_hwaddr.sa_data, sizeof (nic->ethernet));
    		if (ioctl (fd, SIOCGIFINDEX, ifreq) == -1)
    		{
    			error (0, errno, "Can't read interface index: %s", ifreq->ifr_name);
    		}
    		nic->ifindex = ifreq->ifr_ifindex;
    		ifreq++;
    	}
    	close (fd);

    #elif defined (__linux__) || defined (__APPLE__) || defined (__OpenBSD__)

    /*
     *	generic (POSIX) method for unix-like systems;
     */

    	struct ifaddrs * ifaddrs;
    	memset (nics, 0, size * sizeof (struct nic));
    	unsigned next = 0;
    	if (getifaddrs (&ifaddrs) != -1)
    	{
    		struct ifaddrs * ifaddr;
    		for (ifaddr = ifaddrs; ifaddr && size; ifaddr = ifaddr->ifa_next)
    		{
    			struct nic * nic = &nics [next];
    			struct nic * tmp = nics;
    			if (!ifaddr->ifa_addr)
    			{
    				continue;
    			}
    			nic->ifindex = if_nametoindex (ifaddr->ifa_name);
    			for (tmp = nics; tmp->ifindex != nic->ifindex; tmp++);
    			if (tmp == nic)
    			{
    				next++;
    				size--;
    			}
    			else
    			{
    				nic = tmp;
    			}
    			memcpy (nic->ifname, ifaddr->ifa_name, sizeof (nic->ifname));
    			memcpy (nic->ifdesc, ifaddr->ifa_name, sizeof (nic->ifdesc));
    			if (ifaddr->ifa_addr->sa_family == AF_INET)
    			{
    				struct sockaddr_in * sockaddr_in = (struct sockaddr_in *) (ifaddr->ifa_addr);
    				struct in_addr * in_addr = (struct in_addr *)(&sockaddr_in->sin_addr);
    				memcpy (nic->internet, &in_addr->s_addr, sizeof (nic->internet));
    			}

    #if defined (__linux__)
    #define LLADDR(socket) &(socket)->sll_addr

    			if (ifaddr->ifa_addr->sa_family == AF_PACKET)
    			{
    				struct sockaddr_ll * sockaddr_ll = (struct sockaddr_ll *) (ifaddr->ifa_addr);
    				memcpy (nic->ethernet, LLADDR (sockaddr_ll), sizeof (nic->ethernet));
    			}

    #elif defined (__APPLE__) || defined (__OpenBSD__)

    			if (ifaddr->ifa_addr->sa_family == AF_LINK)
    			{
    				struct sockaddr_dl * sockaddr_dl = (struct sockaddr_dl *) (ifaddr->ifa_addr);
    				if (sockaddr_dl->sdl_type == IFT_ETHER)
    				{

    #if 1

    					memcpy (nic->ethernet, LLADDR (sockaddr_dl), sizeof (nic->ethernet));

    #else

    					memcpy (nic->ethernet, LLADDR (sockaddr_dl), sockaddr_dl->sdl_alen);

    #endif

    				}
    			}

    #else
    #error "Abandon all hope!"
    #endif

    		}
    		freeifaddrs (ifaddrs);
    	}

    #else
    #error "Unknown environment"
    #endif

    	return (next);
    }

    #endif

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