coredns(plugin): Add NS record type support

Enables inserting NS record endpoint types into the zone.

Signed-off-by: Michael Nairn <[email protected]>

Author: mikenairn

coredns/plugin/go.mod

@@ -169,4 +169,4 @@ require (
 	sigs.k8s.io/yaml v1.4.0 // indirect
 )
 
-replace github.com/coredns/coredns => github.com/mikenairn/coredns v0.0.0-20250219164557-7d3a43ba6bee
+replace github.com/coredns/coredns => github.com/mikenairn/coredns v0.0.0-20250225081735-144d171bb58f

coredns/plugin/go.sum

@@ -246,8 +246,8 @@ github.com/matttproud/golang_protobuf_extensions v1.0.4/go.mod h1:BSXmuO+STAnVfr
 github.com/miekg/dns v1.1.31/go.mod h1:KNUDUusw/aVsxyTYZM1oqvCicbwhgbNgztCETuNZ7xM=
 github.com/miekg/dns v1.1.63 h1:8M5aAw6OMZfFXTT7K5V0Eu5YiiL8l7nUAkyN6C9YwaY=
 github.com/miekg/dns v1.1.63/go.mod h1:6NGHfjhpmr5lt3XPLuyfDJi5AXbNIPM9PY6H6sF1Nfs=
-github.com/mikenairn/coredns v0.0.0-20250219164557-7d3a43ba6bee h1:cMEVd5FHgStdFkQDG4dXMVNOobcwH7vkS9dxcQ2sV8M=
-github.com/mikenairn/coredns v0.0.0-20250219164557-7d3a43ba6bee/go.mod h1:sbfww1dS+4Uh0fxreDaqQTszOPc9qjVZ0CBuzLo304Y=
+github.com/mikenairn/coredns v0.0.0-20250225081735-144d171bb58f h1:97nsbEfk+/WngFtBH0eyj4zCrjbGB/UnYiMyYNo7Seo=
+github.com/mikenairn/coredns v0.0.0-20250225081735-144d171bb58f/go.mod h1:sbfww1dS+4Uh0fxreDaqQTszOPc9qjVZ0CBuzLo304Y=
 github.com/mitchellh/cli v1.0.0/go.mod h1:hNIlj7HEI86fIcpObd7a0FcrxTWetlwJDGcceTlRvqc=
 github.com/mitchellh/go-homedir v1.1.0 h1:lukF9ziXFxDFPkA1vsr5zpc1XuPDn/wFntq5mG+4E0Y=
 github.com/mitchellh/go-homedir v1.1.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrkLzIz1N1q0pr0=

coredns/plugin/zone.go

@@ -72,6 +72,14 @@ func NewZone(name string) *Zone {
 func (z *Zone) InsertEndpoint(ep *endpoint.Endpoint) error {
 	rrs := []dns.RR{}
 
+	if ep.RecordType == endpoint.RecordTypeNS {
+		for _, t := range ep.Targets {
+			ns := &dns.NS{Hdr: dns.RR_Header{Name: dns.Fqdn(ep.DNSName), Rrtype: dns.TypeNS, Class: dns.ClassINET, Ttl: uint32(ep.RecordTTL)},
+				Ns: dns.Fqdn(t)}
+			rrs = append(rrs, ns)
+		}
+	}
+
 	if ep.RecordType == endpoint.RecordTypeA {
 		for _, t := range ep.Targets {
 			a := &dns.A{Hdr: dns.RR_Header{Name: dns.Fqdn(ep.DNSName), Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: uint32(ep.RecordTTL)},