Add RESINFO rr (#1641)

* Add RESINFO rr

* Update scan_rr.go

---------

Co-authored-by: Miek Gieben <miek@miek.nl>

Author: frcroth

README.md

@@ -194,6 +194,7 @@ Example programs can be found in the `github.com/miekg/exdns` repository.
 * 9461 - Service Binding Mapping for DNS Servers
 * 9462 - Discovery of Designated Resolvers
 * 9460 - SVCB and HTTPS Records
+* 9606 - DNS Resolver Information
 * Draft - Compact Denial of Existence in DNSSEC
 
 ## Loosely Based Upon

scan_rr.go

@@ -1620,6 +1620,16 @@ func (rr *NINFO) parse(c *zlexer, o string) *ParseError {
 	return nil
 }
 
+// Uses the same format as TXT
+func (rr *RESINFO) parse(c *zlexer, o string) *ParseError {
+	s, e := endingToTxtSlice(c, "bad RESINFO Resinfo")
+	if e != nil {
+		return e
+	}
+	rr.Txt = s
+	return nil
+}
+
 func (rr *URI) parse(c *zlexer, o string) *ParseError {
 	l, _ := c.Next()
 	i, e := strconv.ParseUint(l.token, 10, 16)

types.go

@@ -101,6 +101,7 @@ const (
 	TypeCAA        uint16 = 257
 	TypeAVC        uint16 = 258
 	TypeAMTRELAY   uint16 = 260
+	TypeRESINFO    uint16 = 261
 
 	TypeTKEY uint16 = 249
 	TypeTSIG uint16 = 250
@@ -1508,6 +1509,15 @@ func (rr *ZONEMD) String() string {
 		" " + rr.Digest
 }
 
+// RESINFO RR. See RFC 9606.
+
+type RESINFO struct {
+	Hdr RR_Header
+	Txt []string `dns:"txt"`
+}
+
+func (rr *RESINFO) String() string { return rr.Hdr.String() + sprintTxt(rr.Txt) }
+
 // APL RR. See RFC 3123.
 type APL struct {
 	Hdr      RR_Header