feat: add show opt flag

cli/cli.go

@@ -43,6 +43,7 @@ type Flags struct {
 	ShortTTLs      bool   `long:"short-ttls" description:"Remove zero components of pretty TTLs. (24h0m0s->24h) (default: true)"`
 	Color          bool   `long:"color" description:"Enable color output"`
 	ShowQuestion   bool   `long:"question" description:"Show question section"`
+	ShowOpt        bool   `long:"opt" description:"Show OPT records"`
 	ShowAnswer     bool   `long:"answer" description:"Show answer section (default: true)"`
 	ShowAuthority  bool   `long:"authority" description:"Show authority section"`
 	ShowAdditional bool   `long:"additional" description:"Show additional section"`

main.go

@@ -446,6 +446,14 @@ All long form (--) flags can be toggled with the dig-standard +[no]flag notation
 					errChan <- fmt.Errorf("no reply from server")
 				}
 
+				if opts.ShowOpt {
+					for _, o := range reply.Extra {
+						if o.Header().Rrtype == dns.TypeOPT {
+							fmt.Printf("OPT: %v\n", o)
+						}
+					}
+				}
+
 				if transportType != transport.TypeQUIC && opts.IDCheck && reply.Id != msg.Id {
 					errChan <- fmt.Errorf("ID mismatch: expected %d, got %d", msg.Id, reply.Id)
 				}