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Date: Wed, 19 Feb 1997 20:36:28 -0600
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To: freebsd-bugs@FreeBSD.ORG
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X-Personal_name: Edward L. Haletky
From: elh@astroarch.com
Subject: SIOCGIFPHYS
Cc: elh@secretariat.astroarch.com
Sender: owner-bugs@FreeBSD.ORG
X-Loop: FreeBSD.org
Precedence: bulk

I am in need of code that can query the physical hardware address of an ethernet. I have written the following code but it is to no avail.

The SIOCIFPHYS and ifi_physical return 0. I am running 2.1 of FreeBSD. The code follows:

#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <sys/time.h>

#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/route.h>
        
/* IP */
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <arpa/inet.h>
#include <netdb.h> 
                        
main()
{
        size_t needed;  
        int mib[6];
        char *buf, *lim, *next;
        struct if_msghdr *ifm;
        struct sockaddr_dl *sdl;
        int s,flags;
        int af = AF_INET;
        char name[32];
        struct  ifreq       ifr;

        mib[0] = CTL_NET;
        mib[1] = PF_ROUTE;
        mib[2] = 0;
        mib[3] = 0; /* address family */
        mib[4] = NET_RT_IFLIST;
        mib[5] = 0;

        /* if particular family specified, only ask about it */
        sysctl(mib, 6, NULL, &needed, NULL, 0);
        buf = (char *)malloc(needed);
        sysctl(mib, 6, buf, &needed, NULL, 0);
        lim=buf+needed;
        for (next = buf; next < lim; next += ifm->ifm_msglen) {
                ifm = (struct if_msghdr *)next;
                /* XXX: Swallow up leftover NEWADDR messages */
                if (ifm->ifm_type == RTM_NEWADDR)
                        continue;
                if (ifm->ifm_type == RTM_IFINFO) {
                        sdl = (struct sockaddr_dl *)(ifm + 1);
                        flags = ifm->ifm_flags;
                }
                strncpy(name, sdl->sdl_data, sdl->sdl_nlen);
                name[sdl->sdl_nlen] = '\0';
                printf("%s %s\n",name,ifm->ifm_data.ifi_physical);

                s = socket(af, SOCK_DGRAM, 0);
                strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
                ioctl(s, SIOCGIFPHYS, (caddr_t)&ifr);
                printf("%s %d\n",name,ifr.ifr_phys);
        }
}


Suggestions are welcome. :)

Best regards,
Ed Haletky