Update Lego

vendor/github.com/miekg/dns/dns.go

@@ -34,10 +34,15 @@ type RR interface {
 
 	// copy returns a copy of the RR
 	copy() RR
-	// len returns the length (in octets) of the uncompressed RR in wire format.
-	len() int
+
+	// len returns the length (in octets) of the compressed or uncompressed RR in wire format.
+	//
+	// If compression is nil, the uncompressed size will be returned, otherwise the compressed
+	// size will be returned and domain names will be added to the map for future compression.
+	len(off int, compression map[string]struct{}) int
+
 	// pack packs an RR into wire format.
-	pack([]byte, int, map[string]int, bool) (int, error)
+	pack(msg []byte, off int, compression compressionMap, compress bool) (headerEnd int, off1 int, err error)
 }
 
 // RR_Header is the header all DNS resource records share.
@@ -55,16 +60,6 @@ func (h *RR_Header) Header() *RR_Header { return h }
 // Just to implement the RR interface.
 func (h *RR_Header) copy() RR { return nil }
 
-func (h *RR_Header) copyHeader() *RR_Header {
-	r := new(RR_Header)
-	r.Name = h.Name
-	r.Rrtype = h.Rrtype
-	r.Class = h.Class
-	r.Ttl = h.Ttl
-	r.Rdlength = h.Rdlength
-	return r
-}
-
 func (h *RR_Header) String() string {
 	var s string
 
@@ -80,28 +75,29 @@ func (h *RR_Header) String() string {
 	return s
 }
 
-func (h *RR_Header) len() int {
-	l := len(h.Name) + 1
+func (h *RR_Header) len(off int, compression map[string]struct{}) int {
+	l := domainNameLen(h.Name, off, compression, true)
 	l += 10 // rrtype(2) + class(2) + ttl(4) + rdlength(2)
 	return l
 }
 
 // ToRFC3597 converts a known RR to the unknown RR representation from RFC 3597.
 func (rr *RFC3597) ToRFC3597(r RR) error {
-	buf := make([]byte, r.len()*2)
-	off, err := PackRR(r, buf, 0, nil, false)
+	buf := make([]byte, Len(r)*2)
+	headerEnd, off, err := packRR(r, buf, 0, compressionMap{}, false)
 	if err != nil {
 		return err
 	}
 	buf = buf[:off]
-	if int(r.Header().Rdlength) > off {
-		return ErrBuf
-	}
 
-	rfc3597, _, err := unpackRFC3597(*r.Header(), buf, off-int(r.Header().Rdlength))
+	hdr := *r.Header()
+	hdr.Rdlength = uint16(off - headerEnd)
+
+	rfc3597, _, err := unpackRFC3597(hdr, buf, headerEnd)
 	if err != nil {
 		return err
 	}
+
 	*rr = *rfc3597.(*RFC3597)
 	return nil
 }