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#include <stdio.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <string.h>
int main(int argc, char *argv[]) {
int s;
struct ifreq ifr;
s = socket(PF_INET, SOCK_DGRAM, 0);
memset(&ifr, 0x00, sizeof(ifr));
strcpy(ifr.ifr_name, "eth0");
ioctl(s, SIOCGIFHWADDR, &ifr);
close(s);
unsigned char mac_address[6];
sprintf(mac_address, "%.2X%.2X%.2X%.2X%.2X%.2X",
(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]);
printf("%s", mac_address);
}
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