#!/usr/bin/perl
use Inline 'C';
get_mac('eth0');
__END__
__C__
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>

void get_mac( char *iface )
{
    int s;
    struct ifreq buffer;
    memset(&buffer, 0x00, sizeof(buffer));
    s = socket(PF_INET, SOCK_DGRAM, 0);
    strcpy(buffer.ifr_name, iface);
    ioctl(s, SIOCGIFHWADDR, &buffer);
    close(s);
    for( s = 0; s < 5; s++ )
        printf("%.2X:", (unsigned char)buffer.ifr_hwaddr.sa_data[s]);
    printf("%.2X\n", (unsigned char)buffer.ifr_hwaddr.sa_data[s]);

}