/
ip.go
342 lines (282 loc) · 7.24 KB
/
ip.go
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package net
import (
"fmt"
"math"
"net"
api "github.com/bio-routing/bio-rd/net/api"
bmath "github.com/bio-routing/bio-rd/util/math"
)
// IP represents an IPv4 or IPv6 address
type IP struct {
higher uint64
lower uint64
isLegacy bool
}
// Dedup gets a copy of IP from the cache
func (ip IP) Dedup() *IP {
return ipc.get(ip)
}
// Ptr returns a pointer to ip
func (ip IP) Ptr() *IP {
return &ip
}
// IPFromProtoIP creates an IP address from a proto IP
func IPFromProtoIP(addr *api.IP) *IP {
return &IP{
higher: addr.Higher,
lower: addr.Lower,
isLegacy: addr.Version == api.IP_IPv4,
}
}
// ToProto converts an IP to a proto IP
func (ip IP) ToProto() *api.IP {
ver := api.IP_IPv6
if ip.isLegacy {
ver = api.IP_IPv4
}
return &api.IP{
Lower: ip.lower,
Higher: ip.higher,
Version: ver,
}
}
// Lower gets the lower half of the IP address
func (ip *IP) Lower() uint64 {
return ip.lower
}
// Higher gets the higher half of the IP address
func (ip *IP) Higher() uint64 {
return ip.higher
}
func (ip *IP) copy() *IP {
return &IP{
higher: ip.higher,
lower: ip.lower,
isLegacy: ip.isLegacy,
}
}
// IPv4 returns a new `IP` representing an IPv4 address
func IPv4(val uint32) IP {
return IP{
lower: uint64(val),
isLegacy: true,
}
}
// IPv4FromOctets returns an IPv4 address for the given 4 octets
func IPv4FromOctets(o1, o2, o3, o4 uint8) IP {
return IPv4(uint32(o1)<<24 + uint32(o2)<<16 + uint32(o3)<<8 + uint32(o4))
}
// IPv6 returns a new `IP` representing an IPv6 address
func IPv6(higher, lower uint64) IP {
return IP{
higher: higher,
lower: lower,
isLegacy: false,
}
}
// IPv6FromBlocks returns an IPv6 address for the given 8 blocks
func IPv6FromBlocks(b1, b2, b3, b4, b5, b6, b7, b8 uint16) IP {
return IPv6(
uint64(uint64(b1)<<48+uint64(b2)<<32+uint64(b3)<<16+uint64(b4)),
uint64(uint64(b5)<<48+uint64(b6)<<32+uint64(b7)<<16+uint64(b8)))
}
// IPv4FromBytes creates an IPv4 Address from one or more bytes. Missing bytes are filled with zero bytes.
func IPv4FromBytes(b []byte) IP {
switch len(b) {
case 0:
return IPv4FromOctets(0, 0, 0, 0)
case 1:
return IPv4FromOctets(b[0], 0, 0, 0)
case 2:
return IPv4FromOctets(b[0], b[1], 0, 0)
case 3:
return IPv4FromOctets(b[0], b[1], b[2], 0)
case 4:
return IPv4FromOctets(b[0], b[1], b[2], b[3])
}
return IP{}
}
// IPFromBytes returns an IP address for a byte slice
func IPFromBytes(b []byte) (IP, error) {
if len(b) == 4 {
return IPv4FromOctets(b[0], b[1], b[2], b[3]), nil
}
if len(b) == 16 {
return IPv6FromBlocks(
uint16(b[0])<<8+uint16(b[1]),
uint16(b[2])<<8+uint16(b[3]),
uint16(b[4])<<8+uint16(b[5]),
uint16(b[6])<<8+uint16(b[7]),
uint16(b[8])<<8+uint16(b[9]),
uint16(b[10])<<8+uint16(b[11]),
uint16(b[12])<<8+uint16(b[13]),
uint16(b[14])<<8+uint16(b[15])), nil
}
return IP{}, fmt.Errorf("byte slice has an invalid length. Expected either 4 (IPv4) or 16 (IPv6) bytes but got: %d", len(b))
}
// IPFromString returns an IP address for a given string
func IPFromString(str string) (IP, error) {
ip := net.ParseIP(str)
if ip == nil {
return IP{}, fmt.Errorf("%s is not a valid IP address", str)
}
ip4 := ip.To4()
if ip4 != nil {
return IPFromBytes(ip4)
}
return IPFromBytes(ip.To16())
}
// Equal returns true if ip is equal to other
func (ip *IP) Equal(other *IP) bool {
return *ip == *other
}
// Compare compares two IP addresses (returns 0 if equal, -1 if `ip` is smaller than `other`, 1 if `ip` is greater than `other`)
func (ip *IP) Compare(other *IP) int8 {
if ip.higher > other.higher {
return 1
}
if ip.higher < other.higher {
return -1
}
if ip.lower > other.lower {
return 1
}
if ip.lower < other.lower {
return -1
}
return 0
}
// String returns string representation of an IP address
func (ip *IP) String() string {
if !ip.isLegacy {
return ip.stringIPv6()
}
return ip.stringIPv4()
}
func (ip *IP) stringIPv6() string {
return fmt.Sprintf("%X:%X:%X:%X:%X:%X:%X:%X",
ip.higher&0xFFFF000000000000>>48,
ip.higher&0x0000FFFF00000000>>32,
ip.higher&0x00000000FFFF0000>>16,
ip.higher&0x000000000000FFFF,
ip.lower&0xFFFF000000000000>>48,
ip.lower&0x0000FFFF00000000>>32,
ip.lower&0x00000000FFFF0000>>16,
ip.lower&0x000000000000FFFF)
}
func (ip *IP) stringIPv4() string {
b := ip.Bytes()
return fmt.Sprintf("%d.%d.%d.%d", b[0], b[1], b[2], b[3])
}
// Bytes returns the byte representation of an IP address
func (ip *IP) Bytes() []byte {
if !ip.isLegacy {
return ip.bytesIPv6()
}
return ip.bytesIPv4()
}
func (ip *IP) bytesIPv4() []byte {
u := ip.ToUint32()
return []byte{
byte(u & 0xFF000000 >> 24),
byte(u & 0x00FF0000 >> 16),
byte(u & 0x0000FF00 >> 8),
byte(u & 0x000000FF),
}
}
// IsIPv4 returns if the `IP` is of address family IPv4
func (ip *IP) IsIPv4() bool {
return ip.isLegacy
}
// SizeBytes returns the number of bytes required to represent the `IP`
func (ip *IP) SizeBytes() uint8 {
if ip.isLegacy {
return 4
}
return 16
}
// ToUint32 return the rightmost 32 bits of an 'IP'
func (ip *IP) ToUint32() uint32 {
return uint32(^uint64(0) >> 32 & ip.lower)
}
func (ip *IP) bytesIPv6() []byte {
return []byte{
byte(ip.higher & 0xFF00000000000000 >> 56),
byte(ip.higher & 0x00FF000000000000 >> 48),
byte(ip.higher & 0x0000FF0000000000 >> 40),
byte(ip.higher & 0x000000FF00000000 >> 32),
byte(ip.higher & 0x00000000FF000000 >> 24),
byte(ip.higher & 0x0000000000FF0000 >> 16),
byte(ip.higher & 0x000000000000FF00 >> 8),
byte(ip.higher & 0x00000000000000FF),
byte(ip.lower & 0xFF00000000000000 >> 56),
byte(ip.lower & 0x00FF000000000000 >> 48),
byte(ip.lower & 0x0000FF0000000000 >> 40),
byte(ip.lower & 0x000000FF00000000 >> 32),
byte(ip.lower & 0x00000000FF000000 >> 24),
byte(ip.lower & 0x0000000000FF0000 >> 16),
byte(ip.lower & 0x000000000000FF00 >> 8),
byte(ip.lower & 0x00000000000000FF),
}
}
// ToNetIP converts the IP address in a `net.IP`
func (ip *IP) ToNetIP() net.IP {
return net.IP(ip.Bytes())
}
// BitAtPosition returns the bit at position pos
func (ip *IP) BitAtPosition(pos uint8) bool {
if ip.isLegacy {
return ip.bitAtPositionIPv4(pos)
}
return ip.bitAtPositionIPv6(pos)
}
func (ip *IP) bitAtPositionIPv4(pos uint8) bool {
if pos > 32 {
return false
}
return (ip.ToUint32() & (1 << (32 - pos))) != 0
}
func (ip *IP) bitAtPositionIPv6(pos uint8) bool {
if pos > 128 {
return false
}
if pos <= 64 {
return (ip.higher & (1 << (64 - pos))) != 0
}
return (ip.lower & (1 << (128 - pos))) != 0
}
// Next gets the next ip address
func (ip *IP) Next() *IP {
newIP := ip.copy()
if ip.isLegacy {
newIP.lower++
return newIP
}
newIP.lower++
if newIP.lower == 0 {
newIP.higher++
}
return newIP
}
// MaskLastNBits masks the last n bits of an IP address
func (ip *IP) MaskLastNBits(n uint8) *IP {
ip = ip.copy()
if ip.isLegacy {
ip.maskLastNBitsIPv4(n)
return ip
}
ip.maskLastNBitsIPv6(n)
return ip
}
func (ip *IP) maskLastNBitsIPv4(n uint8) {
mask := uint64((math.MaxUint64 << (n)))
ip.lower = ip.lower & mask
}
func (ip *IP) maskLastNBitsIPv6(n uint8) {
maskBitsLow := uint8(bmath.Min(int(n), 64))
maskBitsHigh := uint8(bmath.Max(int(n)-64, 0))
maskLow := uint64((math.MaxUint64 << (maskBitsLow)))
maskHigh := uint64((math.MaxUint64 << (maskBitsHigh)))
ip.lower = ip.lower & maskLow
ip.higher = ip.higher & maskHigh
}