dns/show: sort records

Signed-off-by: Alejandro Mery <amery@jpi.io>

pkg/dns/record.go

@@ -38,6 +38,47 @@ func SortAddrRecords(s []AddrRecord) []AddrRecord {
 	return s
 }
 
+// SortRecords sorts a slice of [libdns.Record], by Name, Type and Value
+func SortRecords(s []libdns.Record) []libdns.Record {
+	sort.Slice(s, func(i, j int) bool {
+		return lessRecord(s[i], s[j])
+	})
+	return s
+}
+
+func lessRecord(a, b libdns.Record) bool {
+	switch {
+	case a.Name < b.Name:
+		return true
+	case a.Name > b.Name:
+		return false
+	}
+
+	switch {
+	case a.Type < b.Type:
+		return true
+	case a.Type > b.Type:
+		return false
+	case a.Type == "A", a.Type == "AAAA":
+		// IP Addresses
+		var aa, ba netip.Addr
+
+		switch {
+		case aa.UnmarshalText([]byte(a.Value)) != nil:
+			// bad address on a
+			return true
+		case ba.UnmarshalText([]byte(b.Value)) != nil:
+			// bad address on b
+			return false
+		default:
+			return aa.Less(ba)
+		}
+	default:
+		// text
+		return a.Value < b.Value
+	}
+}
+
 // SortRegions sorts regions. first by length those 3-character
 // or shorter, and then by length. It's mostly aimed at
 // supporting ISO-3166 order

pkg/dns/show.go

@@ -21,6 +21,8 @@ func (mgr *Manager) Show(ctx context.Context, names ...string) error {
 		return core.Wrap(err, "GetRecords")
 	}
 
+	SortRecords(recs)
+
 	for _, rr := range recs {
 		_ = fmtRecord(&buf, rr)
 		_, _ = buf.WriteRune('\n')