From b4fd46a61d44a70f1b269ae576de7235c5114c7a Mon Sep 17 00:00:00 2001
From: Claude <longneck@scratchbook.ch>
Date: Sat, 20 Oct 2012 21:09:13 +0200
Subject: [PATCH] input.php

---
 htdocs/application/core/Input.php | 73 +++++++++++++++----------------
 1 file changed, 36 insertions(+), 37 deletions(-)

diff --git a/htdocs/application/core/Input.php b/htdocs/application/core/Input.php
index c70803c..2521c20 100755
--- a/htdocs/application/core/Input.php
+++ b/htdocs/application/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 $_GET array
 	 *
+	 * @return	void
 	 */
 	public function __construct()
 	{
@@ -306,51 +306,50 @@ class CI_Input {
 	/**
 	* Fetch the IP Address
 	*
-	* @access	public
 	* @return	string
 	*/
-	function ip_address()
+	public function ip_address()
 	{
 		if ($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'];
+					if ( ! $this->valid_ip($spoof))
+					{
+						$spoof = FALSE;
+					}
+					else
+					{
+						break;
+					}
+				}
+			}
+
+			$this->ip_address = ($spoof !== FALSE && in_array($_SERVER['REMOTE_ADDR'], $proxy_ips, TRUE))
+				? $spoof : $_SERVER['REMOTE_ADDR'];
 		}
-		elseif ($this->server('REMOTE_ADDR') AND $this->server('HTTP_CLIENT_IP'))
-		{
-			$this->ip_address = $_SERVER['HTTP_CLIENT_IP'];
-		}
-		elseif ($this->server('REMOTE_ADDR'))
+		else
 		{
 			$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->ip_address === FALSE)
-		{
-			$this->ip_address = '0.0.0.0';
-			return $this->ip_address;
-		}
-
-		if (strpos($this->ip_address, ',') !== FALSE)
-		{
-			$x = explode(',', $this->ip_address);
-			$this->ip_address = trim(end($x));
-		}
 
 		if ( ! $this->valid_ip($this->ip_address))
 		{
@@ -642,8 +641,8 @@ class CI_Input {
 		$_SERVER['PHP_SELF'] = strip_tags($_SERVER['PHP_SELF']);
 
 
-		// CSRF Protection check
-		if ($this->_enable_csrf == TRUE)
+		// CSRF Protection check on HTTP requests
+		if ($this->_enable_csrf == TRUE && ! $this->is_cli_request())
 		{
 			$this->security->csrf_verify();
 		}
@@ -693,7 +692,7 @@ class CI_Input {
 
 		// Remove control characters
         // Commented out by Claude for Stikked (https://github.com/claudehohl/Stikked/issues/28)
-		//$str = remove_invisible_characters($str);
+        //$str = remove_invisible_characters($str);
 
 		// Should we filter the input data?
 		if ($this->_enable_xss === TRUE)
@@ -838,11 +837,11 @@ class CI_Input {
 	 *
 	 * Test to see if a request was made from the command line
 	 *
-	 * @return 	boolean
+	 * @return 	bool
 	 */
 	public function is_cli_request()
 	{
-		return (php_sapi_name() == 'cli') or defined('STDIN');
+		return (php_sapi_name() === 'cli' OR defined('STDIN'));
 	}
 
 }