go检测端口开放情况

package main

import (
	"bufio"
	"fmt"
	"net"
	"os"
)

func main() {
	fmt.Print("请输入要检测的目标IP地址: ")
	reader := bufio.NewReader(os.Stdin)
	targetIP, _ := reader.ReadString('\n')
	targetIP = targetIP[:len(targetIP)-1] // 移除输入中的换行符

	fmt.Print("请输入要检测的端口号: ")
	portInput, _ := reader.ReadString('\n')
	portInput = portInput[:len(portInput)-1] // 移除输入中的换行符

	// 将端口号转换为整数
	var port int
	_, err := fmt.Sscanf(portInput, "%d", &port)
	if err != nil {
		fmt.Println("无效的端口号")
		return
	}

	targetAddr := fmt.Sprintf("%s:%d", targetIP, port)
	if isOpen(targetAddr) {
		fmt.Printf("检测IP地址为 %s，端口 %d 是开放状态\n", targetIP, port)
	} else {
		fmt.Printf("检测IP地址为 %s，端口 %d 是关闭状态\n", targetIP, port)
	}
}

func isOpen(targetAddr string) bool {
	conn, err := net.Dial("tcp", targetAddr)
	if err != nil {
		return false
	}
	defer conn.Close()
	return true
}