--- referral.module.org	Fri Nov 28 05:10:20 2008
+++ referral.module	Sat Feb 28 18:40:17 2009
@@ -198,9 +198,9 @@
       // Build the userpoints params array
       $params = array(
         'points'      => $points,
-        'uid'         => $cookie[$uid],
+        'uid'         => $cookie['uid'],
         'operation'   => 'referral',
-        'entity_id'   => $cookie[$uid],
+        'entity_id'   => $cookie['uid'],
         'entity_type' => 'user',
         'reference'   => 'referral'
       );
@@ -269,7 +269,25 @@
 	    break;
   }
 }
+function ip_address() {
+  static $ip_address = NULL;
 
+  if (!isset($ip_address)) {
+    $ip_address = $_SERVER['REMOTE_ADDR'];
+    if (variable_get('reverse_proxy', 0) && array_key_exists('HTTP_X_FORWARDED_FOR', $_SERVER)) {
+      // If an array of known reverse proxy IPs is provided, then trust
+      // the XFF header if request really comes from one of them.
+      $reverse_proxy_addresses = variable_get('reverse_proxy_addresses', array());
+      if (!empty($reverse_proxy_addresses) && in_array($ip_address, $reverse_proxy_addresses, TRUE)) {
+        // If there are several arguments, we need to check the most
+        // recently added one, i.e. the last one.
+        $ip_address = array_pop(explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']));
+      }
+    }
+  }
+
+  return $ip_address;
+}
 function referral_set_cookie($uid) {
   $cookie = array(
     'uid'       => $uid,