Re: MAC address for Ethernet interface

[Sean Estabrooks <seanlkml@xxxxxxxxxx>]

On 12 Dec 2003 08:31:32 -0000
"anil  garrepally" <anilgarrepally@xxxxxxxxxxxxxx> wrote:

> Hi,
> 
> Is there any system call available for getting the MAC address of
> ethernet interface. I need it in my program.
> 
> Anil.

Sure,

You can make a "SIOCGIFHWADDR" ioctl call on an open socket.
Here's a small example _without_ proper error checking:

#include <sys/socket.h>
#include <linux/sockios.h>
#include <linux/if.h>
main()
{
     int sd, i;
    struct ifreq buff;

    sd = socket(PF_INET,SOCK_DGRAM,0);
    strncpy(buff.ifr_name, "eth0", IFNAMSIZ);
    ioctl(sd,SIOCGIFHWADDR,&buff);

    for (i=0; i < 6; i++)
      printf("%02X:", (unsigned char)buff.ifr_hwaddr.sa_data[i]);
    printf("\n");
}
 
Regards,
Sean


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