linux c 设置本机ip

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

int main() {
    int sockfd;
    struct ifreq ifr;
    const char *iface = "eth0"; // 替换为你的网络接口名称，如eth0、wlan0等
    const char *ip_addr = "192.168.1.100"; // 替换为你想要设置的IP地址
    const char *netmask = "255.255.255.0"; // 替换为你想要设置的子网掩码

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

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

    struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
    sin->sin_family = AF_INET;
    sin->sin_addr.s_addr = inet_addr(ip_addr);

    if (ioctl(sockfd, SIOCSIFADDR, &ifr) < 0) {
        perror("ioctl[SIOCSIFADDR]");
        close(sockfd);
        exit(EXIT_FAILURE);
    }

    sin->sin_family = AF_INET;
    sin->sin_addr.s_addr = inet_addr(netmask);
    if (ioctl(sockfd, SIOCSIFNETMASK, &ifr) < 0) {
        perror("ioctl[SIOCSIFNETMASK]");
        close(sockfd);
        exit(EXIT_FAILURE);
    }

    printf("IP address %s set on interface %s
", ip_addr, iface);
    close(sockfd);
    return 0;
}