package main

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

func scanPort(host string, port int, wg *sync.WaitGroup) {
	defer wg.Done()

	address := fmt.Sprintf("%s:%d", host, port)
	conn, err := net.DialTimeout("tcp", address, 500*time.Millisecond)
	if err == nil {
		fmt.Printf("[OPEN] %s\n", address)
		conn.Close()
	}
}

func main() {
	var wg sync.WaitGroup

	host := "134.185.113.169" // 스캔할 IP 주소
	startPort := 1
	endPort := 1024

	for port := startPort; port <= endPort; port++ {
		wg.Add(1)
		go scanPort(host, port, &wg)
	}

	wg.Wait()
	fmt.Println("✅ 스캔 완료.")
}