class CI_Input {
//用户ip地址
protected $ip_address = FALSE;
//用户浏览器地址
protected $user_agent = FALSE;
//允许get方式提交数据
protected $_allow_get_array = TRUE;
//新行央视标记
protected $_standardize_newlines = TRUE;
//xss攻击过滤
protected $_enable_xss = FALSE;
//csrf攻击过滤
protected $_enable_csrf = FALSE;
//http请求头
protected $headers = array();
//构造函数
public function __construct()
{
log_message(‘debug‘, "Input Class Initialized");
$this->_allow_get_array = (config_item(‘allow_get_array‘) === TRUE);
$this->_enable_xss = (config_item(‘global_xss_filtering‘) === TRUE);
$this->_enable_csrf = (config_item(‘csrf_protection‘) === TRUE);
global $SEC;
$this->security =& $SEC;
// Do we need the UTF-8 class?
if (UTF8_ENABLED === TRUE)
{
global $UNI;
$this->uni =& $UNI;
}
// Sanitize global arrays
$this->_sanitize_globals();
}
//从数组取出数据
function _fetch_from_array(&$array, $index = ‘‘, $xss_clean = FALSE)
{
if ( ! isset($array[$index]))
{
return FALSE;
}
if ($xss_clean === TRUE)
{
return $this->security->xss_clean($array[$index]);
}
return $array[$index];
}
//从GET数组中取出一个数据
function get($index = NULL, $xss_clean = FALSE)
{
// Check if a field has been provided
if ($index === NULL AND ! empty($_GET))
{
$get = array();
// loop through the full _GET array
foreach (array_keys($_GET) as $key)
{
$get[$key] = $this->_fetch_from_array($_GET, $key, $xss_clean);
}
return $get;
}
return $this->_fetch_from_array($_GET, $index, $xss_clean);
}
//从POST数组中取出数据
function post($index = NULL, $xss_clean = FALSE)
{
// Check if a field has been provided
if ($index === NULL AND ! empty($_POST))
{
$post = array();
// Loop through the full _POST array and return it
foreach (array_keys($_POST) as $key)
{
$post[$key] = $this->_fetch_from_array($_POST, $key, $xss_clean);
}
return $post;
}
return $this->_fetch_from_array($_POST, $index, $xss_clean);
}
//从POST数组或者GET数组中取出数据
function get_post($index = ‘‘, $xss_clean = FALSE)
{
if ( ! isset($_POST[$index]) )
{
return $this->get($index, $xss_clean);
}
else
{
return $this->post($index, $xss_clean);
}
}
//从COOKIE中取出数据
function cookie($index = ‘‘, $xss_clean = FALSE)
{
return $this->_fetch_from_array($_COOKIE, $index, $xss_clean);
}
//设置cookie
function set_cookie($name = ‘‘, $value = ‘‘, $expire = ‘‘, $domain = ‘‘, $path = ‘/‘, $prefix = ‘‘, $secure = FALSE)
{
if (is_array($name))
{
// always leave ‘name‘ in last place, as the loop will break otherwise, due to $$item
foreach (array(‘value‘, ‘expire‘, ‘domain‘, ‘path‘, ‘prefix‘, ‘secure‘, ‘name‘) as $item)
{
if (isset($name[$item]))
{
$$item = $name[$item];
}
}
}
if ($prefix == ‘‘ AND config_item(‘cookie_prefix‘) != ‘‘)
{
$prefix = config_item(‘cookie_prefix‘);
}
if ($domain == ‘‘ AND config_item(‘cookie_domain‘) != ‘‘)
{
$domain = config_item(‘cookie_domain‘);
}
if ($path == ‘/‘ AND config_item(‘cookie_path‘) != ‘/‘)
{
$path = config_item(‘cookie_path‘);
}
if ($secure == FALSE AND config_item(‘cookie_secure‘) != FALSE)
{
$secure = config_item(‘cookie_secure‘);
}
if ( ! is_numeric($expire))
{
$expire = time() - 86500;
}
else
{
$expire = ($expire > 0) ? time() + $expire : 0;
}
setcookie($prefix.$name, $value, $expire, $path, $domain, $secure);
}
//从SERVER数组中取出数据
function server($index = ‘‘, $xss_clean = FALSE)
{
return $this->_fetch_from_array($_SERVER, $index, $xss_clean);
}
//获取IP地址
public function ip_address()
{
if ($this->ip_address !== FALSE)
{
return $this->ip_address;
}
$proxy_ips = config_item(‘proxy_ips‘);
if ( ! empty($proxy_ips))
{
$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];
}
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‘];
}
else
{
$this->ip_address = $_SERVER[‘REMOTE_ADDR‘];
}
if ( ! $this->valid_ip($this->ip_address))
{
$this->ip_address = ‘0.0.0.0‘;
}
return $this->ip_address;
}
//验证IP地址
public function valid_ip($ip, $which = ‘‘)
{
$which = strtolower($which);
// First check if filter_var is available
if (is_callable(‘filter_var‘))
{
switch ($which) {
case ‘ipv4‘:
$flag = FILTER_FLAG_IPV4;
break;
case ‘ipv6‘:
$flag = FILTER_FLAG_IPV6;
break;
default:
$flag = ‘‘;
break;
}
return (bool) filter_var($ip, FILTER_VALIDATE_IP, $flag);
}
if ($which !== ‘ipv6‘ && $which !== ‘ipv4‘)
{
if (strpos($ip, ‘:‘) !== FALSE)
{
$which = ‘ipv6‘;
}
elseif (strpos($ip, ‘.‘) !== FALSE)
{
$which = ‘ipv4‘;
}
else
{
return FALSE;
}
}
$func = ‘_valid_‘.$which;
return $this->$func($ip);
}
//验证IPv4地址
protected function _valid_ipv4($ip)
{
$ip_segments = explode(‘.‘, $ip);
// Always 4 segments needed
if (count($ip_segments) !== 4)
{
return FALSE;
}
// IP can not start with 0
if ($ip_segments[0][0] == ‘0‘)
{
return FALSE;
}
// Check each segment
foreach ($ip_segments as $segment)
{
// IP segments must be digits and can not be
// longer than 3 digits or greater then 255
if ($segment == ‘‘ OR preg_match("/[^0-9]/", $segment) OR $segment > 255 OR strlen($segment) > 3)
{
return FALSE;
}
}
return TRUE;
}
//验证IPv6地址
protected function _valid_ipv6($str)
{
// 8 groups, separated by :
// 0-ffff per group
// one set of consecutive 0 groups can be collapsed to ::
$groups = 8;
$collapsed = FALSE;
$chunks = array_filter(
preg_split(‘/(:{1,2})/‘, $str, NULL, PREG_SPLIT_DELIM_CAPTURE)
);
// Rule out easy nonsense
if (current($chunks) == ‘:‘ OR end($chunks) == ‘:‘)
{
return FALSE;
}
// PHP supports IPv4-mapped IPv6 addresses, so we‘ll expect those as well
if (strpos(end($chunks), ‘.‘) !== FALSE)
{
$ipv4 = array_pop($chunks);
if ( ! $this->_valid_ipv4($ipv4))
{
return FALSE;
}
$groups--;
}
while ($seg = array_pop($chunks))
{
if ($seg[0] == ‘:‘)
{
if (--$groups == 0)
{
return FALSE; // too many groups
}
if (strlen($seg) > 2)
{
return FALSE; // long separator
}
if ($seg == ‘::‘)
{
if ($collapsed)
{
return FALSE; // multiple collapsed
}
$collapsed = TRUE;
}
}
elseif (preg_match("/[^0-9a-f]/i", $seg) OR strlen($seg) > 4)
{
return FALSE; // invalid segment
}
}
return $collapsed OR $groups == 1;
}
//获取客户端
function user_agent()
{
if ($this->user_agent !== FALSE)
{
return $this->user_agent;
}
$this->user_agent = ( ! isset($_SERVER[‘HTTP_USER_AGENT‘])) ? FALSE : $_SERVER[‘HTTP_USER_AGENT‘];
return $this->user_agent;
}
//设置全局数组
function _sanitize_globals()
{
// It would be "wrong" to unset any of these GLOBALS.
$protected = array(‘_SERVER‘, ‘_GET‘, ‘_POST‘, ‘_FILES‘, ‘_REQUEST‘,
‘_SESSION‘, ‘_ENV‘, ‘GLOBALS‘, ‘HTTP_RAW_POST_DATA‘,
‘system_folder‘, ‘application_folder‘, ‘BM‘, ‘EXT‘,
‘CFG‘, ‘URI‘, ‘RTR‘, ‘OUT‘, ‘IN‘);
// Unset globals for securiy.
// This is effectively the same as register_globals = off
foreach (array($_GET, $_POST, $_COOKIE) as $global)
{
if ( ! is_array($global))
{
if ( ! in_array($global, $protected))
{
global $$global;
$$global = NULL;
}
}
else
{
foreach ($global as $key => $val)
{
if ( ! in_array($key, $protected))
{
global $$key;
$$key = NULL;
}
}
}
}
// Is $_GET data allowed? If not we‘ll set the $_GET to an empty array
if ($this->_allow_get_array == FALSE)
{
$_GET = array();
}
else
{
if (is_array($_GET) AND count($_GET) > 0)
{
foreach ($_GET as $key => $val)
{
$_GET[$this->_clean_input_keys($key)] = $this->_clean_input_data($val);
}
}
}
// Clean $_POST Data
if (is_array($_POST) AND count($_POST) > 0)
{
foreach ($_POST as $key => $val)
{
$_POST[$this->_clean_input_keys($key)] = $this->_clean_input_data($val);
}
}
// Clean $_COOKIE Data
if (is_array($_COOKIE) AND count($_COOKIE) > 0)
{
// Also get rid of specially treated cookies that might be set by a server
// or silly application, that are of no use to a CI application anyway
// but that when present will trip our ‘Disallowed Key Characters‘ alarm
// http://www.ietf.org/rfc/rfc2109.txt
// note that the key names below are single quoted strings, and are not PHP variables
unset($_COOKIE[‘$Version‘]);
unset($_COOKIE[‘$Path‘]);
unset($_COOKIE[‘$Domain‘]);
foreach ($_COOKIE as $key => $val)
{
$_COOKIE[$this->_clean_input_keys($key)] = $this->_clean_input_data($val);
}
}
// Sanitize PHP_SELF
$_SERVER[‘PHP_SELF‘] = strip_tags($_SERVER[‘PHP_SELF‘]);
// CSRF Protection check on HTTP requests
if ($this->_enable_csrf == TRUE && ! $this->is_cli_request())
{
$this->security->csrf_verify();
}
log_message(‘debug‘, "Global POST and COOKIE data sanitized");
}
//净化输入数据
function _clean_input_data($str)
{
if (is_array($str))
{
$new_array = array();
foreach ($str as $key => $val)
{
$new_array[$this->_clean_input_keys($key)] = $this->_clean_input_data($val);
}
return $new_array;
}
/* We strip slashes if magic quotes is on to keep things consistent
NOTE: In PHP 5.4 get_magic_quotes_gpc() will always return 0 and
it will probably not exist in future versions at all.
*/
if ( ! is_php(‘5.4‘) && get_magic_quotes_gpc())
{
$str = stripslashes($str);
}
// Clean UTF-8 if supported
if (UTF8_ENABLED === TRUE)
{
$str = $this->uni->clean_string($str);
}
// Remove control characters
$str = remove_invisible_characters($str);
// Should we filter the input data?
if ($this->_enable_xss === TRUE)
{
$str = $this->security->xss_clean($str);
}
// Standardize newlines if needed
if ($this->_standardize_newlines == TRUE)
{
if (strpos($str, "\r") !== FALSE)
{
$str = str_replace(array("\r\n", "\r", "\r\n\n"), PHP_EOL, $str);
}
}
return $str;
}
//净化输入数据键名
function _clean_input_keys($str)
{
if ( ! preg_match("/^[a-z0-9:_\/-]+$/i", $str))
{
exit(‘Disallowed Key Characters.‘);
}
// Clean UTF-8 if supported
if (UTF8_ENABLED === TRUE)
{
$str = $this->uni->clean_string($str);
}
return $str;
}
//设置请求头信息
public function request_headers($xss_clean = FALSE)
{
// Look at Apache go!
if (function_exists(‘apache_request_headers‘))
{
$headers = apache_request_headers();
}
else
{
$headers[‘Content-Type‘] = (isset($_SERVER[‘CONTENT_TYPE‘])) ? $_SERVER[‘CONTENT_TYPE‘] : @getenv(‘CONTENT_TYPE‘);
foreach ($_SERVER as $key => $val)
{
if (strncmp($key, ‘HTTP_‘, 5) === 0)
{
$headers[substr($key, 5)] = $this->_fetch_from_array($_SERVER, $key, $xss_clean);
}
}
}
// take SOME_HEADER and turn it into Some-Header
foreach ($headers as $key => $val)
{
$key = str_replace(‘_‘, ‘ ‘, strtolower($key));
$key = str_replace(‘ ‘, ‘-‘, ucwords($key));
$this->headers[$key] = $val;
}
return $this->headers;
}
//获取请求头
public function get_request_header($index, $xss_clean = FALSE)
{
if (empty($this->headers))
{
$this->request_headers();
}
if ( ! isset($this->headers[$index]))
{
return FALSE;
}
if ($xss_clean === TRUE)
{
return $this->security->xss_clean($this->headers[$index]);
}
return $this->headers[$index];
}
//是否是ajax响应
public function is_ajax_request()
{
return ($this->server(‘HTTP_X_REQUESTED_WITH‘) === ‘XMLHttpRequest‘);
}
//是否是cli请求
public function is_cli_request()
{
return (php_sapi_name() === ‘cli‘ OR defined(‘STDIN‘));
}
}
时间： 2024-10-04 04:12:37