如何在C++中查找带套接字的局域网服务器

#include <iostream>
#include <cstring>
#include <sys/socket.h>
#include <arpa/inet.h>

#define SERVER_PORT 8888
#define BUFFER_SIZE 1024

int main() {
    int sockfd;
    struct sockaddr_in server_addr;
    char buffer[BUFFER_SIZE];

    // 创建套接字
    sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    if (sockfd < 0) {
        std::cerr << "Failed to create socket" << std::endl;
        return -1;
    }

    // 设置套接字选项
    int broadcast = 1;
    if (setsockopt(sockfd, SOL_SOCKET, SO_BROADCAST, &broadcast, sizeof(broadcast)) < 0) {
        std::cerr << "Failed to set socket options" << std::endl;
        return -1;
    }

    // 绑定套接字
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(SERVER_PORT);
    server_addr.sin_addr.s_addr = INADDR_ANY;
    if (bind(sockfd, (struct sockaddr*)&server_addr, sizeof(server_addr)) < 0) {
        std::cerr << "Failed to bind socket" << std::endl;
        return -1;
    }

    // 发送广播消息
    const char* broadcast_msg = "Hello, server!";
    struct sockaddr_in broadcast_addr;
    broadcast_addr.sin_family = AF_INET;
    broadcast_addr.sin_port = htons(SERVER_PORT);
    broadcast_addr.sin_addr.s_addr = inet_addr("255.255.255.255");
    if (sendto(sockfd, broadcast_msg, strlen(broadcast_msg), 0, (struct sockaddr*)&broadcast_addr, sizeof(broadcast_addr)) < 0) {
        std::cerr << "Failed to send broadcast message" << std::endl;
        return -1;
    }

    // 接收服务器响应
    struct sockaddr_in server_response_addr;
    socklen_t server_response_len = sizeof(server_response_addr);
    memset(buffer, 0, sizeof(buffer));
    if (recvfrom(sockfd, buffer, sizeof(buffer), 0, (struct sockaddr*)&server_response_addr, &server_response_len) < 0) {
        std::cerr << "Failed to receive server response" << std::endl;
        return -1;
    }

    // 解析服务器响应
    std::string server_ip = inet_ntoa(server_response_addr.sin_addr);
    int server_port = ntohs(server_response_addr.sin_port);
    std::cout << "Server IP: " << server_ip << std::endl;
    std::cout << "Server Port: " << server_port << std::endl;

    // 连接服务器
    // ...

    close(sockfd);
    return 0;
}