linux下C语言读取网卡MAC地址

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

int main(int argc, char *argv[])
{
    struct ifreq ifreq;
    int sock = 0;
    char mac[32] = "";

    if(argc < 2){
        printf("Usage: ./main eth0");
        return 1;
    }

    sock = socket(AF_INET,SOCK_STREAM,0);
    if(sock < 0)
    {
        perror("error sock");
        return 2;
    }

    strcpy(ifreq.ifr_name,argv[1]);
    if(ioctl(sock,SIOCGIFHWADDR,&ifreq) < 0)
    {
        perror("error ioctl");
        return 3;
    }

    int i = 0;
    for(i = 0; i < 6; i++){
        sprintf(mac+3*i, "%02X:", (unsigned char)ifreq.ifr_hwaddr.sa_data[i]);
    }
    mac[strlen(mac) - 1] = 0;
    printf("MAC: %s\n", mac);
                
    return 0;
}

 

输入:./mac eth0

显示eth0的MAC地址.