Set I/O Control: Socket Interface Hardware Address

Sets the interface hardware address.

EXAMPLE

 #include <sys/types.h>  /* for socket(2) and related bits and pieces */
 #include <sys/socket.h> /* for socket(2) */
 #include <net/if.h>     /* for struct ifreq */
 #include <net/if_arp.h> /* for ARPHRD_ETHER */
 #include <sys/ioctl.h>  /* for IOCTL's */
 #include <stdio.h>      /* for fprintf etc */
 #include <unistd.h>     /* for close */

 int main(int argc,char **argv)
 {
        struct ifreq ifr;
        int skfd;

        if (argc<3) {
                fprintf(stderr,"usage:\n%s interface hwaddr\n",argv[1]);
                return 1;
        }

        /* Fill in the structure */
        snprintf(ifr.ifr_name, IFNAMSIZ, "%s", argv[1]);
        ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
        /* TODO: write some code to parse argv[2] into ifr.ifr_hwaddr.sa_data */
        /* memcpy(&ifr.ifr_hwaddr.sa_data, argv[2], sizeof(ether.address)); */

        /* Create a socket fd */
        skfd = socket(PF_INET,SOCK_STREAM,0);

        /* call the IOCTL */
        if (ioctl(skfd, SIOCSIFHWADDR, &ifr) < 0) {
                perror("ioctl(SIOCSIFHWADDR)");
                return 1;
        }

        /* cleanup */
        close(skfd);

        /* we're out of here! */
        return 0;
 }