Add UDP proxy support

internal/web/handlers.go

@@ -86,6 +86,12 @@ func HandleAdd(db *noodle.Database, pc *chan noodle.Noodle) func(w http.Response
 			return
 		}
 
+		proto := strings.ToUpper(strings.TrimSpace(req.FormValue("proto")))
+		if proto != "TCP" && proto != "UDP" {
+			http.Error(w, "invalid protocol", http.StatusBadRequest)
+			return
+		}
+
 		clientIP := clientIPFromRequest(req)
 		src := strings.TrimSpace(req.FormValue("src"))
 		if src == clientIP {
@@ -99,7 +105,7 @@ func HandleAdd(db *noodle.Database, pc *chan noodle.Noodle) func(w http.Response
 		item := noodle.Noodle{
 			Id:         db.MakeID(),
 			Name:       strings.TrimSpace(req.FormValue("name")),
-			Proto:      "TCP",
+			Proto:      proto,
 			Src:        src,
 			ListenPort: listenPort,
 			DestPort:   destPort,