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|
package lib
import (
"fmt"
"net/netip"
"strings"
"go4.org/netipx"
)
type Container interface {
GetEntry(name string) (*Entry, bool)
Len() int
Add(entry *Entry, opts ...IgnoreIPOption) error
Remove(entry *Entry, rCase CaseRemove, opts ...IgnoreIPOption) error
Loop() <-chan *Entry
Lookup(ipOrCidr string, searchList ...string) ([]string, bool, error)
}
type container struct {
entries map[string]*Entry
}
func NewContainer() Container {
return &container{
entries: make(map[string]*Entry),
}
}
func (c *container) isValid() bool {
return c.entries != nil
}
func (c *container) GetEntry(name string) (*Entry, bool) {
if !c.isValid() {
return nil, false
}
val, ok := c.entries[strings.ToUpper(strings.TrimSpace(name))]
if !ok {
return nil, false
}
return val, true
}
func (c *container) Len() int {
if !c.isValid() {
return 0
}
return len(c.entries)
}
func (c *container) Loop() <-chan *Entry {
ch := make(chan *Entry, 300)
go func() {
for _, val := range c.entries {
ch <- val
}
close(ch)
}()
return ch
}
func (c *container) Add(entry *Entry, opts ...IgnoreIPOption) error {
var ignoreIPType IPType
for _, opt := range opts {
if opt != nil {
ignoreIPType = opt()
}
}
name := entry.GetName()
val, found := c.GetEntry(name)
switch found {
case true:
var ipv4set, ipv6set *netipx.IPSet
var err4, err6 error
if entry.hasIPv4Builder() {
ipv4set, err4 = entry.ipv4Builder.IPSet()
if err4 != nil {
return err4
}
}
if entry.hasIPv6Builder() {
ipv6set, err6 = entry.ipv6Builder.IPSet()
if err6 != nil {
return err6
}
}
switch ignoreIPType {
case IPv4:
if !val.hasIPv6Builder() {
val.ipv6Builder = new(netipx.IPSetBuilder)
}
val.ipv6Builder.AddSet(ipv6set)
case IPv6:
if !val.hasIPv4Builder() {
val.ipv4Builder = new(netipx.IPSetBuilder)
}
val.ipv4Builder.AddSet(ipv4set)
default:
if !val.hasIPv4Builder() {
val.ipv4Builder = new(netipx.IPSetBuilder)
}
if !val.hasIPv6Builder() {
val.ipv6Builder = new(netipx.IPSetBuilder)
}
val.ipv4Builder.AddSet(ipv4set)
val.ipv6Builder.AddSet(ipv6set)
}
case false:
switch ignoreIPType {
case IPv4:
entry.ipv4Builder = nil
case IPv6:
entry.ipv6Builder = nil
}
c.entries[name] = entry
}
return nil
}
func (c *container) Remove(entry *Entry, rCase CaseRemove, opts ...IgnoreIPOption) error {
name := entry.GetName()
val, found := c.GetEntry(name)
if !found {
return fmt.Errorf("entry %s not found", name)
}
var ignoreIPType IPType
for _, opt := range opts {
if opt != nil {
ignoreIPType = opt()
}
}
switch rCase {
case CaseRemovePrefix:
var ipv4set, ipv6set *netipx.IPSet
var err4, err6 error
if entry.hasIPv4Builder() {
ipv4set, err4 = entry.ipv4Builder.IPSet()
if err4 != nil {
return err4
}
}
if entry.hasIPv6Builder() {
ipv6set, err6 = entry.ipv6Builder.IPSet()
if err6 != nil {
return err6
}
}
switch ignoreIPType {
case IPv4:
if !val.hasIPv6Builder() {
val.ipv6Builder = new(netipx.IPSetBuilder)
}
val.ipv6Builder.RemoveSet(ipv6set)
case IPv6:
if !val.hasIPv4Builder() {
val.ipv4Builder = new(netipx.IPSetBuilder)
}
val.ipv4Builder.RemoveSet(ipv4set)
default:
if !val.hasIPv4Builder() {
val.ipv4Builder = new(netipx.IPSetBuilder)
}
if !val.hasIPv6Builder() {
val.ipv6Builder = new(netipx.IPSetBuilder)
}
val.ipv4Builder.RemoveSet(ipv4set)
val.ipv6Builder.RemoveSet(ipv6set)
}
case CaseRemoveEntry:
switch ignoreIPType {
case IPv4:
val.ipv6Builder = nil
case IPv6:
val.ipv4Builder = nil
default:
delete(c.entries, name)
}
default:
return fmt.Errorf("unknown remove case %d", rCase)
}
return nil
}
func (c *container) Lookup(ipOrCidr string, searchList ...string) ([]string, bool, error) {
switch strings.Contains(ipOrCidr, "/") {
case true: // CIDR
prefix, err := netip.ParsePrefix(ipOrCidr)
if err != nil {
return nil, false, err
}
addr := prefix.Addr().Unmap()
switch {
case addr.Is4():
return c.lookup(prefix, IPv4, searchList...)
case addr.Is6():
return c.lookup(prefix, IPv6, searchList...)
}
case false: // IP
addr, err := netip.ParseAddr(ipOrCidr)
if err != nil {
return nil, false, err
}
addr = addr.Unmap()
switch {
case addr.Is4():
return c.lookup(addr, IPv4, searchList...)
case addr.Is6():
return c.lookup(addr, IPv6, searchList...)
}
}
return nil, false, nil
}
func (c *container) lookup(addrOrPrefix any, iptype IPType, searchList ...string) ([]string, bool, error) {
searchMap := make(map[string]bool)
for _, name := range searchList {
if name = strings.ToUpper(strings.TrimSpace(name)); name != "" {
searchMap[name] = true
}
}
isfound := false
result := make([]string, 0, 8)
for entry := range c.Loop() {
if len(searchMap) > 0 && !searchMap[entry.GetName()] {
continue
}
var ipset *netipx.IPSet
var err error
switch iptype {
case IPv4:
ipset, err = entry.GetIPv4Set()
case IPv6:
ipset, err = entry.GetIPv6Set()
}
if err != nil {
return nil, false, err
}
switch addrOrPrefix := addrOrPrefix.(type) {
case netip.Prefix:
if found := ipset.ContainsPrefix(addrOrPrefix); found {
isfound = true
result = append(result, entry.GetName())
}
case netip.Addr:
if found := ipset.Contains(addrOrPrefix); found {
isfound = true
result = append(result, entry.GetName())
}
}
}
return result, isfound, nil
}
|
