java如何检测是否被nmap扫描？

Question

xaing'fa'shi当namp对一台电脑开始扫描时，我能探测到，在namp进行SYN，Null，Xmas扫描的时候是发送SYN包，空标志位包，Fin
等各种包，java有没有办法获取tcp连接中的包呢，非常迷。。。。。

Answer 1

import java.io.IOException;
import java.net.Socket;

public class NmapDetection {

    public static boolean isNmapScanning(String host, int[] ports) {
        for (int port : ports) {
            try (Socket socket = new Socket(host, port)) {
                // 如果连接成功，表示该端口被打开，可能被nmap扫描
                System.out.println("Port " + port + " is open");
                return true;
            } catch (IOException e) {
                // 如果连接失败，表示该端口被关闭或被防火墙保护
                System.out.println("Port " + port + " is closed");
            }
        }
        return false;
    }

    public static void main(String[] args) {
        String host = "your-host";
        int[] ports = {80, 443, 8080}; // 常见的HTTP/HTTPS端口

        boolean isScanned = isNmapScanning(host, ports);
        if (isScanned) {
            System.out.println("Detected nmap scanning");
        } else {
            System.out.println("No nmap scanning detected");
        }
    }
}