126 lines
2.9 KiB
Go
126 lines
2.9 KiB
Go
// Copyright (c) 2016-2019 Tigera, Inc. All rights reserved.
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package net
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import (
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"encoding/json"
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"math/big"
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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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// MarshalJSON interface for an IP
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func (i IP) MarshalJSON() ([]byte, error) {
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s, err := i.MarshalText()
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if err != nil {
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return nil, err
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}
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return json.Marshal(string(s))
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}
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// UnmarshalJSON interface for an IP
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func (i *IP) UnmarshalJSON(b []byte) error {
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var s string
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if err := json.Unmarshal(b, &s); err != nil {
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return err
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}
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if err := i.UnmarshalText([]byte(s)); err != nil {
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return 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 ipv4 := i.To4(); ipv4 != nil {
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i.IP = ipv4
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}
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return nil
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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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func IPToBigInt(ip IP) *big.Int {
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if ip.To4() != nil {
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return big.NewInt(0).SetBytes(ip.To4())
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} else {
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return big.NewInt(0).SetBytes(ip.To16())
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}
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}
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func BigIntToIP(ipInt *big.Int) IP {
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ip := IP{net.IP(ipInt.Bytes())}
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return ip
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}
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func IncrementIP(ip IP, increment *big.Int) IP {
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sum := big.NewInt(0).Add(IPToBigInt(ip), increment)
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return BigIntToIP(sum)
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}
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