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package lib
import (
"fmt"
"net"
"net/netip"
"strings"
"go4.org/netipx"
)
type Entry struct {
name string
ipv4Builder *netipx.IPSetBuilder
ipv6Builder *netipx.IPSetBuilder
ipv4Set *netipx.IPSet
ipv6Set *netipx.IPSet
}
func NewEntry(name string) *Entry {
return &Entry{
name: strings.ToUpper(strings.TrimSpace(name)),
}
}
func (e *Entry) GetName() string {
return e.name
}
func (e *Entry) hasIPv4Builder() bool {
return e.ipv4Builder != nil
}
func (e *Entry) hasIPv6Builder() bool {
return e.ipv6Builder != nil
}
func (e *Entry) hasIPv4Set() bool {
return e.ipv4Set != nil
}
func (e *Entry) hasIPv6Set() bool {
return e.ipv6Set != nil
}
func (e *Entry) GetIPv4Set() (*netipx.IPSet, error) {
if err := e.buildIPSet(); err != nil {
return nil, err
}
if e.hasIPv4Set() {
return e.ipv4Set, nil
}
return nil, fmt.Errorf("entry %s has no ipv4 set", e.GetName())
}
func (e *Entry) GetIPv6Set() (*netipx.IPSet, error) {
if err := e.buildIPSet(); err != nil {
return nil, err
}
if e.hasIPv6Set() {
return e.ipv6Set, nil
}
return nil, fmt.Errorf("entry %s has no ipv6 set", e.GetName())
}
func (e *Entry) processPrefix(src any) (*netip.Prefix, IPType, error) {
switch src := src.(type) {
case net.IP:
ip, ok := netipx.FromStdIP(src)
if !ok {
return nil, "", ErrInvalidIP
}
ip = ip.Unmap()
switch {
case ip.Is4():
prefix := netip.PrefixFrom(ip, 32)
return &prefix, IPv4, nil
case ip.Is6():
prefix := netip.PrefixFrom(ip, 128)
return &prefix, IPv6, nil
default:
return nil, "", ErrInvalidIPLength
}
case *net.IPNet:
prefix, ok := netipx.FromStdIPNet(src)
if !ok {
return nil, "", ErrInvalidIPNet
}
ip := prefix.Addr().Unmap()
switch {
case ip.Is4():
return &prefix, IPv4, nil
case ip.Is6():
return &prefix, IPv6, nil
default:
return nil, "", ErrInvalidIPLength
}
case netip.Addr:
src = src.Unmap()
switch {
case src.Is4():
prefix := netip.PrefixFrom(src, 32)
return &prefix, IPv4, nil
case src.Is6():
prefix := netip.PrefixFrom(src, 128)
return &prefix, IPv6, nil
default:
return nil, "", ErrInvalidIPLength
}
case *netip.Addr:
*src = (*src).Unmap()
switch {
case src.Is4():
prefix := netip.PrefixFrom(*src, 32)
return &prefix, IPv4, nil
case src.Is6():
prefix := netip.PrefixFrom(*src, 128)
return &prefix, IPv6, nil
default:
return nil, "", ErrInvalidIPLength
}
case netip.Prefix:
ip := src.Addr()
switch {
case ip.Is4():
prefix, err := ip.Prefix(src.Bits())
if err != nil {
return nil, "", ErrInvalidPrefix
}
return &prefix, IPv4, nil
case ip.Is4In6():
ip = ip.Unmap()
bits := src.Bits()
if bits < 96 {
return nil, "", ErrInvalidPrefix
}
prefix, err := ip.Prefix(bits - 96)
if err != nil {
return nil, "", ErrInvalidPrefix
}
return &prefix, IPv4, nil
case ip.Is6():
prefix, err := ip.Prefix(src.Bits())
if err != nil {
return nil, "", ErrInvalidPrefix
}
return &prefix, IPv6, nil
default:
return nil, "", ErrInvalidIPLength
}
case *netip.Prefix:
ip := src.Addr()
switch {
case ip.Is4():
prefix, err := ip.Prefix(src.Bits())
if err != nil {
return nil, "", ErrInvalidPrefix
}
return &prefix, IPv4, nil
case ip.Is4In6():
ip = ip.Unmap()
bits := src.Bits()
if bits < 96 {
return nil, "", ErrInvalidPrefix
}
prefix, err := ip.Prefix(bits - 96)
if err != nil {
return nil, "", ErrInvalidPrefix
}
return &prefix, IPv4, nil
case ip.Is6():
prefix, err := ip.Prefix(src.Bits())
if err != nil {
return nil, "", ErrInvalidPrefix
}
return &prefix, IPv6, nil
default:
return nil, "", ErrInvalidIPLength
}
case string:
src, _, _ = strings.Cut(src, "#")
src, _, _ = strings.Cut(src, "//")
src, _, _ = strings.Cut(src, "/*")
src = strings.TrimSpace(src)
if src == "" {
return nil, "", ErrCommentLine
}
switch strings.Contains(src, "/") {
case true: // src is CIDR notation
ip, network, err := net.ParseCIDR(src)
if err != nil {
return nil, "", ErrInvalidCIDR
}
addr, ok := netipx.FromStdIP(ip)
if !ok {
return nil, "", ErrInvalidIP
}
if addr.Unmap().Is4() && strings.Contains(network.String(), "::") { // src is invalid IPv4-mapped IPv6 address
return nil, "", ErrInvalidCIDR
}
prefix, ok := netipx.FromStdIPNet(network)
if !ok {
return nil, "", ErrInvalidIPNet
}
addr = prefix.Addr().Unmap()
switch {
case addr.Is4():
return &prefix, IPv4, nil
case addr.Is6():
return &prefix, IPv6, nil
default:
return nil, "", ErrInvalidIPLength
}
case false: // src is IP address
ip, err := netip.ParseAddr(src)
if err != nil {
return nil, "", ErrInvalidIP
}
ip = ip.Unmap()
switch {
case ip.Is4():
prefix := netip.PrefixFrom(ip, 32)
return &prefix, IPv4, nil
case ip.Is6():
prefix := netip.PrefixFrom(ip, 128)
return &prefix, IPv6, nil
default:
return nil, "", ErrInvalidIPLength
}
}
}
return nil, "", ErrInvalidPrefixType
}
func (e *Entry) add(prefix *netip.Prefix, ipType IPType) error {
switch ipType {
case IPv4:
if !e.hasIPv4Builder() {
e.ipv4Builder = new(netipx.IPSetBuilder)
}
e.ipv4Builder.AddPrefix(*prefix)
case IPv6:
if !e.hasIPv6Builder() {
e.ipv6Builder = new(netipx.IPSetBuilder)
}
e.ipv6Builder.AddPrefix(*prefix)
default:
return ErrInvalidIPType
}
return nil
}
func (e *Entry) remove(prefix *netip.Prefix, ipType IPType) error {
switch ipType {
case IPv4:
if e.hasIPv4Builder() {
e.ipv4Builder.RemovePrefix(*prefix)
}
case IPv6:
if e.hasIPv6Builder() {
e.ipv6Builder.RemovePrefix(*prefix)
}
default:
return ErrInvalidIPType
}
return nil
}
func (e *Entry) AddPrefix(cidr any) error {
prefix, ipType, err := e.processPrefix(cidr)
if err != nil && err != ErrCommentLine {
return err
}
if err := e.add(prefix, ipType); err != nil {
return err
}
return nil
}
func (e *Entry) RemovePrefix(cidr string) error {
prefix, ipType, err := e.processPrefix(cidr)
if err != nil && err != ErrCommentLine {
return err
}
if err := e.remove(prefix, ipType); err != nil {
return err
}
return nil
}
func (e *Entry) buildIPSet() error {
if e.hasIPv4Builder() && !e.hasIPv4Set() {
ipv4set, err := e.ipv4Builder.IPSet()
if err != nil {
return err
}
e.ipv4Set = ipv4set
}
if e.hasIPv6Builder() && !e.hasIPv6Set() {
ipv6set, err := e.ipv6Builder.IPSet()
if err != nil {
return err
}
e.ipv6Set = ipv6set
}
return nil
}
func (e *Entry) MarshalPrefix(opts ...IgnoreIPOption) ([]netip.Prefix, error) {
var ignoreIPType IPType
for _, opt := range opts {
if opt != nil {
ignoreIPType = opt()
}
}
disableIPv4, disableIPv6 := false, false
switch ignoreIPType {
case IPv4:
disableIPv4 = true
case IPv6:
disableIPv6 = true
}
if err := e.buildIPSet(); err != nil {
return nil, err
}
prefixes := make([]netip.Prefix, 0, 1024)
if !disableIPv4 && e.hasIPv4Set() {
prefixes = append(prefixes, e.ipv4Set.Prefixes()...)
}
if !disableIPv6 && e.hasIPv6Set() {
prefixes = append(prefixes, e.ipv6Set.Prefixes()...)
}
if len(prefixes) > 0 {
return prefixes, nil
}
return nil, fmt.Errorf("entry %s has no prefix", e.GetName())
}
func (e *Entry) MarshalIPRange(opts ...IgnoreIPOption) ([]netipx.IPRange, error) {
var ignoreIPType IPType
for _, opt := range opts {
if opt != nil {
ignoreIPType = opt()
}
}
disableIPv4, disableIPv6 := false, false
switch ignoreIPType {
case IPv4:
disableIPv4 = true
case IPv6:
disableIPv6 = true
}
if err := e.buildIPSet(); err != nil {
return nil, err
}
ipranges := make([]netipx.IPRange, 0, 1024)
if !disableIPv4 && e.hasIPv4Set() {
ipranges = append(ipranges, e.ipv4Set.Ranges()...)
}
if !disableIPv6 && e.hasIPv6Set() {
ipranges = append(ipranges, e.ipv6Set.Ranges()...)
}
if len(ipranges) > 0 {
return ipranges, nil
}
return nil, fmt.Errorf("entry %s has no prefix", e.GetName())
}
func (e *Entry) MarshalText(opts ...IgnoreIPOption) ([]string, error) {
var ignoreIPType IPType
for _, opt := range opts {
if opt != nil {
ignoreIPType = opt()
}
}
disableIPv4, disableIPv6 := false, false
switch ignoreIPType {
case IPv4:
disableIPv4 = true
case IPv6:
disableIPv6 = true
}
if err := e.buildIPSet(); err != nil {
return nil, err
}
cidrList := make([]string, 0, 1024)
if !disableIPv4 && e.hasIPv4Set() {
for _, prefix := range e.ipv4Set.Prefixes() {
cidrList = append(cidrList, prefix.String())
}
}
if !disableIPv6 && e.hasIPv6Set() {
for _, prefix := range e.ipv6Set.Prefixes() {
cidrList = append(cidrList, prefix.String())
}
}
if len(cidrList) > 0 {
return cidrList, nil
}
return nil, fmt.Errorf("entry %s has no prefix", e.GetName())
}