From 7a42173a16fcf7c53023aee4610ac42523e86226 Mon Sep 17 00:00:00 2001
From: Aleksander Machniak <alec@alec.pl>
Date: Thu, 13 Aug 2015 09:04:19 +0200
Subject: [PATCH] Simplify rcube_utils::check_ip()

---
 program/lib/Roundcube/rcube_utils.php | 34 +--------------------------
 tests/Framework/Utils.php             |  5 ++++
 2 files changed, 6 insertions(+), 33 deletions(-)

diff --git a/program/lib/Roundcube/rcube_utils.php b/program/lib/Roundcube/rcube_utils.php
index 162d4cb8d..924b0d63c 100644
--- a/program/lib/Roundcube/rcube_utils.php
+++ b/program/lib/Roundcube/rcube_utils.php
@@ -143,39 +143,7 @@ class rcube_utils
      */
     public static function check_ip($ip)
     {
-        // IPv6, but there's no build-in IPv6 support
-        if (strpos($ip, ':') !== false && !defined('AF_INET6')) {
-            $parts = explode(':', $ip);
-            $count = count($parts);
-
-            if ($count > 8 || $count < 2) {
-                return false;
-            }
-
-            foreach ($parts as $idx => $part) {
-                $length = strlen($part);
-                if (!$length) {
-                    // there can be only one ::
-                    if ($found_empty && $idx > 2) {
-                        return false;
-                    }
-                    $found_empty = true;
-                }
-                // last part can be an IPv4 address
-                else if ($idx == $count - 1) {
-                    if (!preg_match('/^[0-9a-f]{1,4}$/i', $part)) {
-                        return @inet_pton($part) !== false;
-                    }
-                }
-                else if (!preg_match('/^[0-9a-f]{1,4}$/i', $part)) {
-                    return false;
-                }
-            }
-
-            return true;
-        }
-
-        return @inet_pton($ip) !== false;
+        return filter_var($ip, FILTER_VALIDATE_IP) !== false;
     }
 
     /**
diff --git a/tests/Framework/Utils.php b/tests/Framework/Utils.php
index d5b853db3..dd0ff72d8 100644
--- a/tests/Framework/Utils.php
+++ b/tests/Framework/Utils.php
@@ -95,6 +95,8 @@ class Framework_Utils extends PHPUnit_Framework_TestCase
             array('::1'),
             array('::1.2.3.4'),
             array('2001:2d12:c4fe:5afe::1'),
+            array('2001::'),
+            array('2001::1'),
         );
     }
 
@@ -110,7 +112,10 @@ class Framework_Utils extends PHPUnit_Framework_TestCase
             array('1.1.1.1.1'),
             array('::1.2.3.260'),
             array('::1.0'),
+            array(':::1'),
+            array('2001:::1'),
             array('2001::c4fe:5afe::1'),
+            array(':c4fe:5afe:1'),
         );
     }