/
ip.go
executable file
·74 lines (61 loc) · 1.38 KB
/
ip.go
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// -*- coding: utf-8 -*-
// Copyright (C) 2018 Nippon Telegraph and Telephone Corporation.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ncnet
import (
"net"
)
const (
IPVER4 = 4
IPVER6 = 6
IPBITS4 = 32
IPBITS6 = 128
IPBITS_FULL = -1
)
func IPStringToVersion(s string) (int, error) {
ip := net.ParseIP(s)
if ip == nil {
var err error
if ip, _, err = net.ParseCIDR(s); err != nil {
return 0, err
}
}
return IPToVersion(ip), nil
}
func IPToVersion(ip net.IP) int {
if ip.To4() == nil {
return IPVER6
}
return IPVER4
}
func IPToBitlen(ip net.IP) int {
if IPToVersion(ip) == 4 {
return IPBITS4
}
return IPBITS6
}
func IPToIPNet(ip net.IP, plen int) *net.IPNet {
if ip == nil {
return nil
}
bitlen := IPToBitlen(ip)
if plen == IPBITS_FULL {
plen = bitlen
}
return &net.IPNet{
IP: ip,
Mask: net.CIDRMask(plen, bitlen),
}
}