这段代码主要来自网络,源代码存在问题,现在已经修复,可以直接编译运行
package main import ( "net" "fmt" "os" "runtime" "time" "strconv" ) func loop(startport, endport int, inport chan int) { for i := startport; i <= endport; i++{ inport <- i } } func scanner(inport, outport, out chan int, ip net.IP, endport int){ for{ in := <- inport tcpaddr := &net.TCPAddr{IP:ip,Port:in} conn, err := net.DialTCP("tcp", nil, tcpaddr) if err != nil { outport <- 0 }else{ outport <- in conn.Close() } if in == endport{ out <- in } } } func main() { runtime.GOMAXPROCS(4) inport := make(chan int) starttime := time.Now().Unix() outport := make(chan int) out := make(chan int) collect := []int{} if len(os.Args) != 4 { fmt.Println("Usage: scanner.exe IP startport endport") fmt.Println("Endport must be larger than startport") os.Exit(0) } ip := net.ParseIP(os.Args[1]) if(os.Args[3] < os.Args[2]) { fmt.Println("Usage: scanner IP startport endport") fmt.Println("Endport must be larger than startport") os.Exit(0) } fmt.Printf("the ip is %s \r\n",ip) startport, _:= strconv.Atoi(os.Args[2]) endport, _ := strconv.Atoi(os.Args[3]) fmt.Printf("%d---------%d\r\n",startport,endport) go loop(startport, endport, inport) for{ select { case <-out: fmt.Println(collect) endtime := time.Now().Unix() fmt.Println("The scan process has spent ",endtime - starttime,"second") os.Exit(0) default: go scanner(inport, outport, out, ip, endport) port := <- outport if port != 0{ collect = append(collect, port) } } } }
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