65 lines
1.4 KiB
Go
65 lines
1.4 KiB
Go
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package net
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import (
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"net"
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)
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// Sub class net.IP so that we can add JSON marshalling and unmarshalling.
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type IP struct {
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net.IP
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}
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// ParseIP returns an IP from a string
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func ParseIP(ip string) *IP {
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addr := net.ParseIP(ip)
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if addr == nil {
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return nil
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}
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// Always return IPv4 values as 4-bytes to be consistent with IPv4 IPNet
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// representations.
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if addr4 := addr.To4(); addr4 != nil {
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addr = addr4
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}
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return &IP{addr}
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}
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// Version returns the IP version for an IP, or 0 if the IP is not valid.
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func (i IP) Version() int {
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if i.To4() != nil {
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return 4
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} else if len(i.IP) == net.IPv6len {
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return 6
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}
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return 0
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}
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// Network returns the IP address as a fully masked IPNet type.
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func (i *IP) Network() *IPNet {
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// Unmarshaling an IPv4 address returns a 16-byte format of the
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// address, so convert to 4-byte format to match the mask.
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n := &IPNet{}
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if ip4 := i.IP.To4(); ip4 != nil {
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n.IP = ip4
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n.Mask = net.CIDRMask(net.IPv4len*8, net.IPv4len*8)
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} else {
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n.IP = i.IP
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n.Mask = net.CIDRMask(net.IPv6len*8, net.IPv6len*8)
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}
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return n
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}
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// MustParseIP parses the string into a IP.
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func MustParseIP(i string) IP {
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var ip IP
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err := ip.UnmarshalText([]byte(i))
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if err != nil {
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panic(err)
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}
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// Always return IPv4 values as 4-bytes to be consistent with IPv4 IPNet
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// representations.
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if ip4 := ip.To4(); ip4 != nil {
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ip.IP = ip4
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}
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return ip
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}
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