linux c 获取mac地址

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

int main() {
    int sockfd;
    struct ifreq ifr;
    char *iface = "eth0"; // 替换为你的网络接口名称，如eth0、wlan0等

    if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
        perror("socket");
        exit(EXIT_FAILURE);
    }

    memset(&ifr, 0, sizeof(ifr));
    strncpy(ifr.ifr_name, iface, IFNAMSIZ - 1);

    if (ioctl(sockfd, SIOCGIFHWADDR, &ifr) == -1) {
        perror("ioctl");
        close(sockfd);
        exit(EXIT_FAILURE);
    }

    close(sockfd);

    unsigned char *mac = (unsigned char *)ifr.ifr_hwaddr.sa_data;
    printf("MAC地址: %02x:%02x:%02x:%02x:%02x:%02x
",
           mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);

    return 0;
}