C linux get Mac Address

 In my case, I failed to get Mac from eth0 devices.

So I need to check all devices to get Mac address.

This is my solution example code:

(study.marearts.com)

..

#include <sys/ioctl.h>

#include <net/if.h>

#include <unistd.h>

#include <netinet/in.h>

#include <string.h>

#include <stdio.h>

#include <sstream>

#include <string>

#include <iostream>

std::string getMac(){

struct ifreq ifr;

struct ifconf ifc;

char buf[1024];

int success = 0;

int sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);

if (sock == -1) { /* handle error*/ };

ifc.ifc_len = sizeof(buf);

ifc.ifc_buf = buf;

if (ioctl(sock, SIOCGIFCONF, &ifc) == -1) { /* handle error */ }

struct ifreq* it = ifc.ifc_req;

const struct ifreq* const end = it + (ifc.ifc_len / sizeof(struct ifreq));

int a=0;

for (; it != end; ++it) {

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) {

success = 1;

break;

}

}

}

else {

/* handle error */

return "0";

}

}

unsigned char mac_address[6];

if (success)

{

memcpy(mac_address, ifr.ifr_hwaddr.sa_data, 6);

std::stringstream ss;

std::string target;

char buffer [50];

sprintf (buffer, "%x-%x-%x-%x-%x-%x", mac_address[0], mac_address[1], mac_address[2], mac_address[3], mac_address[4], mac_address[5]);

ss << buffer;

ss >> target;

return target;

}

return "0";

}

int main()

{

std::cout<< getMac() << std::endl;

}

..

Output is

44-a5-6e-63-a4-bb

Thank you.

marearts