====== Rilevare MAC address ======
Autore: **//Fabio Di Matteo//** \\ Ultima revisione: **//19/03/2008//** \\ \\

Stampa sullo stdout il mac address di eth0.

<code c>

#include <stdio.h>

#include <string.h> /* for strncpy */

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <net/if.h>

int
main()
{
 int fd;
 struct ifreq ifr;

 fd = socket(AF_INET, SOCK_DGRAM, 0);

 ifr.ifr_addr.sa_family = AF_INET;
 strncpy(ifr.ifr_name, "eth0", IFNAMSIZ-1);

 ioctl(fd, SIOCGIFHWADDR, &ifr);

 close(fd);

 /* display result */
 printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x\n",
         (unsigned char)ifr.ifr_hwaddr.sa_data[0],
         (unsigned char)ifr.ifr_hwaddr.sa_data[1],
         (unsigned char)ifr.ifr_hwaddr.sa_data[2],
         (unsigned char)ifr.ifr_hwaddr.sa_data[3],
         (unsigned char)ifr.ifr_hwaddr.sa_data[4],
         (unsigned char)ifr.ifr_hwaddr.sa_data[5]);

 return 0;
}
</code>