linux c 获取网卡参数

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

int main(int argc, char *argv[]) {
    int sockfd;
    struct ifreq ifr;
    const char *iface = "eth0"; // 网卡名称

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

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

    // 获取IP地址
    if (ioctl(sockfd, SIOCGIFADDR, &ifr) == -1) {
        perror("ioctl");
        close(sockfd);
        exit(1);
    }
    printf("IP Address: %s
", inet_ntoa(((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr));

    // 获取MAC地址
    if (ioctl(sockfd, SIOCGIFHWADDR, &ifr) == -1) {
        perror("ioctl");
        close(sockfd);
        exit(1);
    }
    printf("MAC Address: %02x:%02x:%02x:%02x:%02x:%02x
",
           (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]);

    close(sockfd);
    return 0;
}