c language to get MAC address, run on Raspberry Pi/Raspbian Jessie

c language to get MAC address, run on Raspberry Pi/Raspbian Jessie:


reference: http://www.geekpage.jp/en/programming/linux-network/get-macaddr.php

cMAC.c

#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <net/if.h>

int
main()
{
    int fd;
    struct ifreq ifr;
    
    fd = socket(AF_INET, SOCK_DGRAM, 0);
    
    ifr.ifr_addr.sa_family = AF_INET;
    strncpy(ifr.ifr_name, "eth0", IFNAMSIZ-1);
    
    ioctl(fd, SIOCGIFHWADDR, &ifr);
    close(fd);
    
    printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x\n",
        (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]);
        
    return 0;
}

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