golang编写判断ip是否能够ping通

package main

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

func (ip string) (bool) {
  recvBuf1 := make([]byte, 2048)
    payload:=[]byte{0x08,0x00,0x4d,0x4b,0x00,0x01,0x00,0x10,0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x6b,0x6c,0x6d,0x6e,0x6f,0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69}
    Time, _ := time.ParseDuration("3s")
  conn, err := net.DialTimeout("ip4:icmp", ip,Time)
    if err !=nil {
     fmt.Println("bibi")
      return false
   }
    _,err=conn.Write(payload)
    if err !=nil {
     return false
   }
    conn.SetReadDeadline(time.Now().Add(time.Second * 2))
    num, err := conn.Read(recvBuf1[0:])
  if err !=nil {
     
     Timetcp, _ := time.ParseDuration("1s")
       conn1, err := net.DialTimeout("tcp", ip+":80",Timetcp)
       if err == nil {
            defer conn1.Close()
         return true
        }

       conn2, err := net.DialTimeout("tcp", ip+":443",Timetcp)
      if err == nil {
            defer conn2.Close()
         return true
        }

       conn3, err := net.DialTimeout("tcp", ip+":3389",Timetcp)
     if err == nil {
            defer conn3.Close()
         return true
        }

       conn4, err := net.DialTimeout("tcp", ip+":22",Timetcp)
       if err == nil {
            defer conn4.Close()
         return true
        }

       return false
   }
    conn.SetReadDeadline(time.Time{})
    if string(recvBuf1[0:num]) !="" {
      return  true
   }
    return false

}

func main()  {
  ip := "172.8.47.213"
 fmt.Println(isping(ip))
}