mirror of
https://github.com/kubernetes-sigs/external-dns.git
synced 2025-08-05 17:16:59 +02:00
113 lines
2.8 KiB
Go
113 lines
2.8 KiB
Go
/*
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Copyright 2024 The Kubernetes Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package source
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import (
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"context"
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"fmt"
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"net/netip"
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"sigs.k8s.io/external-dns/endpoint"
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)
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// nat64Source is a Source that adds A endpoints for AAAA records including an NAT64 address.
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type nat64Source struct {
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source Source
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nat64Prefixes []string
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}
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// NewNAT64Source creates a new nat64Source wrapping the provided Source.
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func NewNAT64Source(source Source, nat64Prefixes []string) Source {
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return &nat64Source{source: source, nat64Prefixes: nat64Prefixes}
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}
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// Endpoints collects endpoints from its wrapped source and returns them without duplicates.
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func (s *nat64Source) Endpoints(ctx context.Context) ([]*endpoint.Endpoint, error) {
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parsedNAT64Prefixes := make([]netip.Prefix, 0)
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for _, prefix := range s.nat64Prefixes {
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pPrefix, err := netip.ParsePrefix(prefix)
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if err != nil {
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return nil, err
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}
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if pPrefix.Bits() != 96 {
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return nil, fmt.Errorf("NAT64 prefixes need to be /96 prefixes.")
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}
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parsedNAT64Prefixes = append(parsedNAT64Prefixes, pPrefix)
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}
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additionalEndpoints := []*endpoint.Endpoint{}
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endpoints, err := s.source.Endpoints(ctx)
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if err != nil {
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return nil, err
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}
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for _, ep := range endpoints {
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if ep.RecordType != endpoint.RecordTypeAAAA {
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continue
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}
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v4Targets := make([]string, 0)
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for _, target := range ep.Targets {
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ip, err := netip.ParseAddr(target)
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if err != nil {
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return nil, err
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}
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var sPrefix *netip.Prefix
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for _, cPrefix := range parsedNAT64Prefixes {
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if cPrefix.Contains(ip) {
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sPrefix = &cPrefix
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}
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}
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// If we do not have a NAT64 prefix, we skip this record.
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if sPrefix == nil {
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continue
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}
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ipBytes := ip.As16()
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v4AddrBytes := ipBytes[12:16]
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v4Addr, isOk := netip.AddrFromSlice(v4AddrBytes)
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if !isOk {
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return nil, fmt.Errorf("Could not parse %v to IPv4 address", v4AddrBytes)
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}
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v4Targets = append(v4Targets, v4Addr.String())
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}
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if len(v4Targets) == 0 {
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continue
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}
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v4EP := ep.DeepCopy()
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v4EP.Targets = v4Targets
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v4EP.RecordType = endpoint.RecordTypeA
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additionalEndpoints = append(additionalEndpoints, v4EP)
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}
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return append(endpoints, additionalEndpoints...), nil
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}
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func (s *nat64Source) AddEventHandler(ctx context.Context, handler func()) {
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s.source.AddEventHandler(ctx, handler)
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}
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