tcp端口扫描器

package tcpScanner

import (
    "fmt"
    "net"
    "sort"
)

/*
多通道通信
*/

func workerL(ports, results chan int) {
    for p := range ports {
        addr := fmt.Sprintf("124.223.113.130:%d", p)
        conn, err := net.Dial("tcp", addr)
        if err != nil {
            results <- 0
            continue
        }
        conn.Close()
        results <- p
    }
}

func Demo5() {
    ports := make(chan int, 100)
    results := make(chan int)

    var openports []int

    for i := 0; i < cap(ports); i++ {
        go workerL(ports, results)
    }
    go func() {
        for i := 0; i < 65535; i++ {
            ports <- i
        }
    }()
    for i := 0; i < 65535; i++ {
        port := <-results
        if port != 0 {
            openports = append(openports, port)
        }
    }
    close(ports)
    close(results)
    sort.Ints(openports)

    for _, port := range openports {
        fmt.Printf("%d open\n", port)
    }
}

package main

import "tcpScanner/tcpScanner"

func main() {
    tcpScanner.Demo5()
}