From 5a4d3d420f9d152dddd0021094ebb4fd1a49e5ea Mon Sep 17 00:00:00 2001
From: "Fedor A. Fetisov" <faf@ossg.ru>
Date: Fri, 3 Dec 2021 20:20:40 +0300
Subject: [PATCH] Fix potential problem with some absent HTTP request headers

---
 src/mibew/libs/chat.php       | 6 ++++--
 src/mibew/libs/pagination.php | 4 +++-
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/mibew/libs/chat.php b/src/mibew/libs/chat.php
index c24af18d..6431c139 100644
--- a/src/mibew/libs/chat.php
+++ b/src/mibew/libs/chat.php
@@ -609,9 +609,11 @@ function visitor_from_request()
  */
 function get_remote_host()
 {
-    $ext_addr = $_SERVER['REMOTE_ADDR'];
+    $ext_addr = isset($_SERVER['REMOTE_ADDR'])
+                ? $_SERVER['REMOTE_ADDR']
+                : '';
     $has_proxy = isset($_SERVER['HTTP_X_FORWARDED_FOR'])
-        && $_SERVER['HTTP_X_FORWARDED_FOR'] != $_SERVER['REMOTE_ADDR'];
+        && $_SERVER['HTTP_X_FORWARDED_FOR'] != $ext_addr;
     if ($has_proxy) {
         $ips = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR'], 2);
         $ext_addr = (count($ips) > 1)
diff --git a/src/mibew/libs/pagination.php b/src/mibew/libs/pagination.php
index 6625421b..4f81277d 100644
--- a/src/mibew/libs/pagination.php
+++ b/src/mibew/libs/pagination.php
@@ -36,7 +36,9 @@
  */
 function generate_pagination_link($page, $title)
 {
-    $lnk = $_SERVER['REQUEST_URI'];
+    $lnk = isset($_SERVER['REQUEST_URI'])
+           ? $_SERVER['REQUEST_URI']
+           : '';
     $href = preg_replace("/\?page=\d+\&/", "?", preg_replace("/\&page=\d+/", "", $lnk));
     $href .= strstr($href, "?") ? "&page=$page" : "?page=$page";