Linux C获取网卡状态

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

int get_network_status(const char *interface) {
    int sockfd;
    struct ifreq ifr;

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

    strncpy(ifr.ifr_name, interface, IFNAMSIZ - 1);

    // 获取IP地址
    if (ioctl(sockfd, SIOCGIFADDR, &ifr) == 0) {
        struct sockaddr_in *ipaddr = (struct sockaddr_in *)&ifr.ifr_addr;
        printf("IP Address: %s\n", inet_ntoa(ipaddr->sin_addr));
    } else {
        perror("ioctl SIOCGIFADDR");
    }

    // 获取网卡状态
    if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) == 0) {
        if (ifr.ifr_flags & IFF_UP) {
            printf("Interface %s is UP\n", interface);
        } else {
            printf("Interface %s is DOWN\n", interface);
        }
    } else {
        perror("ioctl SIOCGIFFLAGS");
    }

    close(sockfd);
    return 0;
}

int main() {
    get_network_status("eth0");
    return 0;
}