The mac address or the hardware address or the ethernet address of an interface is a 48 bit number that looks like this : 00:1c:c0:f8:79:ee
The mac address of an interface can be found given its name. The function to use is ioctl.
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#include <stdio.h> //printf
#include <string.h> //strncpy
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h> //ifreq
#include <unistd.h> //close
int
main()
{
int
fd;
struct
ifreq ifr;
char
*iface =
"eth0"
;
unsigned
char
*mac;
fd = socket(AF_INET, SOCK_DGRAM, 0);
ifr.ifr_addr.sa_family = AF_INET;
strncpy
(ifr.ifr_name , iface , IFNAMSIZ-1);
ioctl(fd, SIOCGIFHWADDR, &ifr);
close(fd);
mac = (unsigned
char
*)ifr.ifr_hwaddr.sa_data;
//display mac address
printf
(
"Mac : %.2x:%.2x:%.2x:%.2x:%.2x:%.2x\n"
, mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
return
0;
}
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Output
1 |
$ gcc interface_mac.c && ./a.out |
2 |
Mac : 00:1c:c0:f8:79:ee |
