Add a feature switch to reachability

config.php.example

@@ -5,3 +5,5 @@ $state_file = "state.json"; // The location for the state file. If it does not e
 $error_reporting = false; // Whether PHP errors should be shown. Not recommended for production.
 
 $lobby_timeout_seconds = 30; // How long it should take for unresponsive lobbies to get auto-delisted.
+
+$check_reachability = true; // Whether to reach out to the lobby listing host to confirm the lobby is reachable.

index.php

@@ -30,16 +30,21 @@ if ($error_reporting) {
 
 $reachable = false;
 if (isset($_GET["new"])) {
-  require "enet_probe.php";
+  if ($check_reachability) {
-  $host = $_SERVER['REMOTE_ADDR'];
+    require "enet_probe.php";
-  if (!empty($_GET["host"])) {
+    $host = $_SERVER['REMOTE_ADDR'];
-    $host = $_GET["host"];
+    if (!empty($_GET["host"])) {
+      $host = $_GET["host"];
+    }
+    $port = 50403;
+    if (!empty($_GET["port"]) && is_numeric($_GET["port"])) {
+      $port = intval($_GET["port"]);
+    }
+    $reachable = enet_probe($host, $port);
   }
-  $port = 50403;
+  else {
-  if (!empty($_GET["port"]) && is_numeric($_GET["port"])) {
+    $reachable = true;
-    $port = intval($_GET["port"]);
   }
-  $reachable = enet_probe($host, $port);
 }
 
 $dirname = dirname($state_file);