package main

import (
	"fmt"
	"net"
	"time"
)

// 检查指定的 IP 和端口是否可达
func test_port(ip string, port int, timeout time.Duration) bool {
	address := fmt.Sprintf("%s:%d", ip, port)
	conn, err := net.DialTimeout("tcp", address, timeout)
	if err != nil {
		fmt.Printf("无法连接到 %s: %v\n", address, err)
		return false
	}
	defer conn.Close()
	return true
}