After getting a list of network interfaces,
This code will print MAC address per each interface except loopback.
#include <sys/ioctl.h>
#include <net/if.h>
#include <unistd.h>
#include <netinet/in.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <iostream>
#define MAC_STRING_LENGTH 13
int main()
{
char mac_address[MAC_STRING_LENGTH];
struct ifreq ifr;
struct ifconf ifc;
char buf[1024];
int success = 0;
int sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
if (sock == -1) { return -1;}
ifc.ifc_len = sizeof(buf);
ifc.ifc_buf = buf;
if (ioctl(sock, SIOCGIFCONF, &ifc) == -1)
{
std::cout << "error" << std::endl;
return 0;
}
struct ifreq* it = ifc.ifc_req;
const struct ifreq* const end = it + (ifc.ifc_len / sizeof(struct ifreq));
for (; it != end; ++it) {
std::cout << it->ifr_name << std::endl;
strcpy(ifr.ifr_name, it->ifr_name);
if (ioctl(sock, SIOCGIFFLAGS, &ifr) == 0) {
if (! (ifr.ifr_flags & IFF_LOOPBACK)) { // don't count loopback
if (ioctl(sock, SIOCGIFHWADDR, &ifr) == 0) {
for (int i = 0; i < 6; ++i)
snprintf(mac_address+i*2,MAC_STRING_LENGTH-i*2,"%02x",(unsigned char) ifr.ifr_addr.sa_data[i]);
std::cout << mac_address << std::endl;
}
}
}
else {
std::cout << "error" << std::endl;
return 0;
}
}
}
