帶互動的telnet小工具,golang版

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package netTools //main //import ("fmt""net""strconv""strings""time")func smain() {lis, err := net.Listen("tcp", ":1789")if err != nil {fmt.Println(err)}defer lis.Close()for {con, _ := lis.Accept()go handler(con)}}func handler(con net.Conn) {defer con.Close()buf := make([]byte, 20)n, _ := con.Read(buf)fmt.Println(string(buf[:n]))con.Write(buf)con.Write(buf)}//func main() {//buf, err := Telnet([]string{"w_Hello World", "r_50", "r_30"}, "127.0.0.1:1789", 20)//fmt.Println(err)//fmt.Println(string(buf))//}func PortIsOpen(ip string, timeout int) bool {con, err := net.DialTimeout("tcp", ip, time.Duration(timeout))if err != nil {return false}con.Close()return true}func Telnet(action []string, ip string, timeout int) (buf []byte, err error) {con, err := net.DialTimeout("tcp", ip, time.Duration(timeout)*time.Second)if err != nil {return}defer con.Close()con.SetReadDeadline(time.Now().Add(time.Second * 5))for _, v := range action {l := strings.SplitN(v, "_", 2)if len(l) < 2 {return}switch l[0] {case "r":var n intn, err = strconv.Atoi(l[1])if err != nil {return}p := make([]byte, n)n, err = con.Read(p)if err != nil {return}buf = append(buf, p[:n]...)fmt.Println(buf)case "w":_, err = con.Write([]byte(l[1]))}}return}