checking in- needs some refinement then done

netsplit/funcs_ianaprefix.go

@@ -0,0 +1,65 @@
+package netsplit
+
+import (
+	`encoding/xml`
+	`errors`
+	`fmt`
+	`io`
+	`net/netip`
+	`strings`
+)
+
+// UnmarshalXML conforms an IANAPrefix to (encoding/xml).Unmarshaler.
+func (i *IANAPrefix) UnmarshalXML(d *xml.Decoder, start xml.StartElement) (err error) {
+
+	var tok xml.Token
+	var nextRefIdx int
+	var ref *IANARef
+	var pfxStr []string
+	var sb *strings.Builder = new(strings.Builder)
+
+	for {
+		if tok, err = d.Token(); err != nil {
+			if errors.Is(err, io.EOF) {
+				err = nil
+				break
+			}
+			return
+		}
+		switch t := tok.(type) {
+		case xml.CharData:
+			sb.Write(t)
+		case xml.StartElement:
+			switch t.Name.Local {
+			case "xref":
+				ref = new(IANARef)
+				if err = d.DecodeElement(ref, &t); err != nil {
+					return
+				}
+				if i.References == nil {
+					i.References = make([]*IANARef, 0)
+				}
+				i.References = append(i.References, ref)
+				// No reference for these; they should be only network addrs.
+				// fmt.Fprintf(sb, "[REF %d]", nextRefIdx)
+				nextRefIdx++
+			default:
+				fmt.Println(t.Name.Local)
+				continue
+			}
+		}
+	}
+
+	pfxStr = strings.Split(sb.String(), ",")
+	i.Prefixes = make([]*netip.Prefix, len(pfxStr))
+	for idx, p := range pfxStr {
+		i.Prefixes[idx] = new(netip.Prefix)
+		if *i.Prefixes[idx], err = netip.ParsePrefix(
+			strings.TrimSpace(p),
+		); err != nil {
+			return
+		}
+	}
+
+	return
+}