#include <iostream>
#include <cstring>
#include <arpa/inet.h>
#include <netdb.h>
#include <unistd.h>
 
int main() {
    char hostname[256];
    struct addrinfo hints, *res;
 
    // 获取主机名
    if (gethostname(hostname, sizeof(hostname)) == -1) {
        perror("获取主机名失败");
        return 1;
    }
 
    // 设置addrinfo结构体参数
    memset(&hints, 0, sizeof(hints));
    hints.ai_family = AF_INET;
    hints.ai_socktype = SOCK_STREAM;
 
    // 获取IP地址
    if (getaddrinfo(hostname, NULL, &hints, &res) != 0) {
        perror("获取IP地址失败");
        return 1;
    }
 
    // 遍历IP地址列表
    for (struct addrinfo *p = res; p != NULL; p = p->ai_next) {
        struct sockaddr_in *ip_addr = (struct sockaddr_in*)p->ai_addr;
        char ip[INET_ADDRSTRLEN];
        inet_ntop(AF_INET, &(ip_addr->sin_addr), ip, INET_ADDRSTRLEN);
        std::cout << "IP地址: " << ip << std::endl;
    }
 
    freeaddrinfo(res);
    return 0;
}