From b0fe0a9a6813e8d3ebca94c5fa86ab6f36f3390d Mon Sep 17 00:00:00 2001
From: Andrey Andreev <narf@bofh.bg>
Date: Sat, 6 Oct 2012 15:24:53 +0300
Subject: Fix issues #227 and #907

---
 system/core/Input.php | 63 +++++++++++++++++++++++++--------------------------
 1 file changed, 31 insertions(+), 32 deletions(-)

(limited to 'system')

diff --git a/system/core/Input.php b/system/core/Input.php
index 3559d8607..66e02ba00 100755
--- a/system/core/Input.php
+++ b/system/core/Input.php
@@ -73,13 +73,13 @@ class CI_Input {
 	 */
 	protected $headers			= array();
 
-
 	/**
 	 * Constructor
 	 *
 	 * Sets whether to globally enable the XSS processing
 	 * and whether to allow the $_GET array
 	 *
+	 * @return	void
 	 */
 	public function __construct()
 	{
@@ -306,50 +306,49 @@ class CI_Input {
 	/**
 	* Fetch the IP Address
 	*
-	* @access	public
 	* @return	string
 	*/
-	function ip_address()
+	public function ip_address()
 	{
 		if ($this->ip_address !== FALSE)
 		{
 			return $this->ip_address;
 		}
 
-		if (config_item('proxy_ips') != '' && $this->server('HTTP_X_FORWARDED_FOR') && $this->server('REMOTE_ADDR'))
+		$proxy_ips = config_item('proxy_ips');
+		if ( ! empty($proxy_ips))
 		{
-			$proxies = preg_split('/[\s,]/', config_item('proxy_ips'), -1, PREG_SPLIT_NO_EMPTY);
-			$proxies = is_array($proxies) ? $proxies : array($proxies);
+			$proxy_ips = explode(',', str_replace(' ', '', $proxy_ips));
+			foreach (array('HTTP_X_FORWARDED_FOR', 'HTTP_CLIENT_IP', 'HTTP_X_CLIENT_IP', 'HTTP_X_CLUSTER_CLIENT_IP') as $header)
+			{
+				if (($spoof = $this->server($header)) !== FALSE)
+				{
+					// Some proxies typically list the whole chain of IP
+					// addresses through which the client has reached us.
+					// e.g. client_ip, proxy_ip1, proxy_ip2, etc.
+					if (strpos($spoof, ',') !== FALSE)
+					{
+						$spoof = explode(',', $spoof, 2);
+						$spoof = $spoof[0];
+					}
 
-			$this->ip_address = in_array($_SERVER['REMOTE_ADDR'], $proxies) ? $_SERVER['HTTP_X_FORWARDED_FOR'] : $_SERVER['REMOTE_ADDR'];
-		}
-		elseif ($this->server('REMOTE_ADDR') AND $this->server('HTTP_CLIENT_IP'))
-		{
-			$this->ip_address = $_SERVER['HTTP_CLIENT_IP'];
-		}
-		elseif ($this->server('REMOTE_ADDR'))
-		{
-			$this->ip_address = $_SERVER['REMOTE_ADDR'];
-		}
-		elseif ($this->server('HTTP_CLIENT_IP'))
-		{
-			$this->ip_address = $_SERVER['HTTP_CLIENT_IP'];
-		}
-		elseif ($this->server('HTTP_X_FORWARDED_FOR'))
-		{
-			$this->ip_address = $_SERVER['HTTP_X_FORWARDED_FOR'];
-		}
+					if ( ! $this->valid_ip($spoof))
+					{
+						$spoof = NULL;
+					}
+					else
+					{
+						break;
+					}
+				}
+			}
 
-		if ($this->ip_address === FALSE)
-		{
-			$this->ip_address = '0.0.0.0';
-			return $this->ip_address;
+			$this->ip_address = ($spoof !== NULL && in_array($_SERVER['REMOTE_ADDR'], $proxy_ips, TRUE))
+				? $spoof : $_SERVER['REMOTE_ADDR'];
 		}
-
-		if (strpos($this->ip_address, ',') !== FALSE)
+		else
 		{
-			$x = explode(',', $this->ip_address);
-			$this->ip_address = trim(end($x));
+			$this->ip_address = $_SERVER['REMOTE_ADDR'];
 		}
 
 		if ( ! $this->valid_ip($this->ip_address))
-- 
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