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#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
/* print the MAC address of eth0 (or other interface given as argument) */
int main(int argc, char *argv[]) {
unsigned char mac[IFHWADDRLEN];
struct ifreq ifr;
char *eth = "eth0";
if (argc > 1) eth = argv[1];
int fd = socket(AF_INET, SOCK_DGRAM, 0);
if (fd == -1) return -1;
strncpy(ifr.ifr_name, eth, sizeof(ifr.ifr_name));
if (ioctl(fd, SIOCGIFHWADDR, &ifr) == -1) return -1;
memcpy(mac, ifr.ifr_hwaddr.sa_data, IFHWADDRLEN);
assert(IFHWADDRLEN == 6);
printf("%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x\n",
(unsigned)mac[0],
(unsigned)mac[1],
(unsigned)mac[2],
(unsigned)mac[3],
(unsigned)mac[4],
(unsigned)mac[5]);
return 0;
}
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