How to get mac address in Android native code

Question

I can get mac address with this C code:

struct ifreq s;
char buffer[12 + 1];
int fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
int i, j;
memset(buffer, 0 , sizeof(buffer));
strcpy(s.ifr_name, "wlan0");

if (0 == ioctl(fd, SIOCGIFHWADDR, &s)) {
    memcpy(mac, s.ifr_addr.sa_data, 6);
    return 1;
}

I want to get mac address in Android. but this code does not give MAC address. if (0 == ioctl(fd, SIOCGIFHWADDR, &s) is always false.

I found a code in https://groups.google.com/d/msg/android-ndk/6Y-0Eid3mGw/6bFvtap8xJIJ

But this code gives error:

ioctl(SIOCGIFHWADDR) error

and it gives wrong mac address like 00:00:00:7C::00:01

How can I get mac address in Android native code ?

FYI, this used to work before Android M, consider getting it in Java and passing it. See http://stackoverflow.com/questions/33159224/getting-mac-address-in-android-6-0 (5th answer down works) — Michael, May 04 '17 at 20:46

score 1 · Answer 1 · answered Jul 12 '17 at 16:11

This code works good on Nexus 5:

#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <linux/sockios.h>
#include <linux/if.h>
#include <linux/in.h>


int get_mac_addr(char *mac_addr)
{
  int sockfd;
  struct ifreq ifr;

  if ((sockfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP)) >= 0) {
    //strncpy(ifr.ifr_name, "eth0", IFNAMESIZE);
    strncpy(ifr.ifr_name, "wlan0", IFNAMSIZ);

    ifr.ifr_addr.sa_family = AF_INET;

    if (ioctl(sockfd, SIOCGIFHWADDR, (char*) &ifr) == 0) {
      sprintf(mac_addr, "%02X:%02X:%02X:%02X:%02X:%02X", 
              (unsigned char) ifr.ifr_ifru.ifru_hwaddr.sa_data[0], (unsigned char) ifr.ifr_ifru.ifru_hwaddr.sa_data[1],
              (unsigned char) ifr.ifr_ifru.ifru_hwaddr.sa_data[2], (unsigned char) ifr.ifr_ifru.ifru_hwaddr.sa_data[3],
              (unsigned char) ifr.ifr_ifru.ifru_hwaddr.sa_data[4], (unsigned char) ifr.ifr_ifru.ifru_hwaddr.sa_data[5]);
      return 0;  
    }
  }
  /* error */
  return -1;
}



int main(int argc, char *argv[], char *envp[])
{
  char mac_addr[80] = {0};
  printf( "MAC = %d, %s\n", get_mac_addr(mac_addr), mac_addr );

  return 0;
}

score 0 · Answer 2 · answered Dec 16 '16 at 14:37

0

You must connect to a WiFi network, then try to get mac address.

answered Dec 16 '16 at 14:37

Behrouz.M

3,445
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How to get mac address in Android native code

2 Answers2