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plugin/k8s_external: Add support for PTR requests (#5435)

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* Exclude External IP addresses from being added to the existing kubernetes' plugin IP->Service index
* Add support for PTR requests on External IPs of Services to the k8s_external plugin

Signed-off-by: Chris O'Haver <cohaver@infoblox.com>
This commit is contained in:
Chris O'Haver 2022-07-06 13:55:15 -04:00 • committed by GitHub
parent d903a963ee
commit e80d696502
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GPG key ID: 4AEE18F83AFDEB23
12 changed files with 163 additions and 44 deletions
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14
plugin/k8s_external/msg_to_dns.go
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@ -5,6 +5,7 @@ import (
"math"
"github.com/coredns/coredns/plugin/etcd/msg"
"github.com/coredns/coredns/plugin/pkg/dnsutil"
"github.com/coredns/coredns/request"
"github.com/miekg/dns"
@ -76,6 +77,19 @@ func (e *External) aaaa(ctx context.Context, services []msg.Service, state reque
return records, truncated
}
func (e *External) ptr(services []msg.Service, state request.Request) (records []dns.RR) {
dup := make(map[string]struct{})
for _, s := range services {
if _, ok := dup[s.Host]; !ok {
dup[s.Host] = struct{}{}
rr := s.NewPTR(state.QName(), dnsutil.Join(s.Host, e.Zones[0]))
rr.Hdr.Ttl = e.ttl
records = append(records, rr)
}
}
return records
}
func (e *External) srv(ctx context.Context, services []msg.Service, state request.Request) (records, extra []dns.RR) {
dup := make(map[item]struct{})