dongliyan9190 2019-08-28 20:37
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在Go中将网络掩码转换为CIDR

I'm looking for a way to convert a netmask string into CIDR notation in Go.

For instance, "255.255.255.0" -> "/24"

I'm currently obtaining an IP address and the net mask string with the below logic, which may just be complicating things.

I've been perusing the net library trying to see if there is a different function to use to accomplish what I'd like, which is really just a IP address in CIDR notation:

192.168.1.2/24
var mgmtInterface *net.Interface
var err error

mgmtInterface, err = net.InterfaceByName("eth0")
if err != nil {
  log.Println("Unable to find interface eth0, trying en0")
  mgmtInterface, err = net.InterfaceByName("en0")
}

addrs, err := mgmtInterface.Addrs()
if err != nil {
  log.Println("interface has no address")
}

for _, addr := range addrs {
  var ip net.IP
  var mask net.IPMask
  switch v := addr.(type) {
  case *net.IPNet:
    ip = v.IP
    mask = v.Mask
  case *net.IPAddr:
    ip = v.IP
    mask = ip.DefaultMask()
  }

  if ip == nil {
    continue
  }

  ip = ip.To4()
  if ip == nil {
    continue
  }

  // create the netmask
  cleanMask := fmt.Sprintf("%d.%d.%d.%d", mask[0], mask[1], mask[2], mask[3])

} 
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2条回答 默认 最新

  • douguangxiang0363 2019-08-28 22:53
    关注

    This isn't very obvious at first, but:

    addr := ip.To4()
    sz, _ := net.IPV4Mask(addr[0], addr[1], addr[2], addr[3]).Size()
    
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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