From owner-freebsd-ports  Mon Nov  6  4:15:17 2000
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From: Gerald Pfeifer <pfeifer@dbai.tuwien.ac.at>
To: <ports@freebsd.org>, <emulation@freebsd.org>
Subject: Wine port: How to obtain MAC address?
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For the Wine port I'd need to obtain the MAC address of an ethernet
interface, alas it seems that this is not easily possible the way it
is done in Linux/Solaris?

For Linux, the code in Wine looks as follows:

    strcpy(ifInfo.ifr_name, ifName);
    if (ioctl(sock, SIOCGIFHWADDR, &ifInfo) < 0)
    {
         ERR ("Error obtaining MAC Address!\n");
         close(sock);
         return (-1);
    }
    else
    {
         /* FIXME: Is it correct to assume size of 6? */
         memcpy(IntInfo->if_physaddr, ifInfo.ifr_hwaddr.sa_data, 6);
        IntInfo->if_physaddrlen=6;
    }

For FreeBSD I tried the following program, which doesn't really do what
I want. If I use SIOCSIFPHYADDR, I get errno=22, and SIOCGIFADDR leads
to a crash later on.

Any hints?  (Most probably I'm tried completely stupid things, but
unfortunately, that part of the system is not really documented apart
from the include files, so I had to take a guess&check approach. :-( )

-------- cut --------
#include <stdio.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
#include <errno.h>

main() {
    struct ifreq ifInfo;
    int sock;
    int status;

    if ( (sock = socket (AF_INET, SOCK_DGRAM, 0)) < 0 )
         {
         printf("Error creating socket!\n");
         return -1;
         }

    memset(&ifInfo,0,sizeof ifInfo);
    strcpy(ifInfo.ifr_name,"fxp0");
    if ( (status = ioctl(sock,/*SIOCSIFPHYADDR*/SIOCGIFADDR,&ifInfo)) < 0)
         {
         printf("Error %d obtaining MAC Address!\n",errno);
         close(sock);
         return -1;
         }
    else
         {
         char *p=ifInfo.ifr_data;
         unsigned u;
         printf("Pointer=%ld\nMAC Address=",(long int)p); fflush(stdout);
         for(u=0; u < 6; u++)
             printf("%d:",(int)*p);
         }
    }
-------- cut --------

Gerald
-- 
Gerald "Jerry" pfeifer@dbai.tuwien.ac.at http://www.dbai.tuwien.ac.at/~pfeifer/



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