ipv4和ipv6与int互转通用处理方式

记录一下ipv4和ipv6与int互转通用处理方式,由于ipv6转的int比较大,因此需要使用big.Int来保存

package main

import (
	"fmt"
	"math/big"
	"net/netip"
)

func InetNtoA(ip *big.Int, ipv4 int64) string {
	if ip == nil {
		ip = new(big.Int).SetInt64(ipv4)
	}

	addr, ok := netip.AddrFromSlice(ip.Bytes())
	if ok {
		return addr.String()
	}
	return ""
}

func InetAtoN(ip string) (*big.Int, int64, error) {
	addr, err := netip.ParseAddr(ip)
	if err != nil {
		return nil, 0, err
	}
	// ipv4和ipv6分两种情况,使调用方知道返回类型
	ipInt := new(big.Int).SetBytes(addr.AsSlice())
	if addr.Is4() {
		return nil, ipInt.Int64(), nil
	}
	return ipInt, 0, nil
}

func main() {
	ipv6 := "fe80::21b:77ff:fbd6:7860"
	ipInt, ipv4, err := InetAtoN(ipv6)
	if err != nil {
		panic(err)
	}
	fmt.Println(ipInt, ipv4, InetNtoA(ipInt, ipv4))

	ip := "192.168.78.123"
	ipInt, ipv4, err = InetAtoN(ip)
	if err != nil {
		panic(err)
	}

	fmt.Println(ipInt, ipv4, InetNtoA(ipInt, ipv4))
}

原文地址：http://www.cnblogs.com/janbar/p/16860808.html