我正在运行一个Codeigniter 2.0 Web 应用程序，并且我正在使用带有 DB 选项的会话库，因此对于我网站上的每个连接，我都有一个名为'ci_sessions'存储的 MySQL 表：
Session_id我有两个问题：
66.249.72.1520.0.0.0每次我的服务器运行 cron 或每次 google bot 抓取我的页面时，都会创建一个新会话。所以我有数百个与 IP 相同的会话0.0.0.0和数百个与 IP相同的会话66.249.72.152。
有谁知道如何阻止机器人或 cron 创建会话？或者如果这不能完成......有谁知道如何每隔一段时间自动删除这些会话？谢谢！
一种可能的解决方案是实施不应为其创建会话的 IP 黑名单。
我创建了两种方法来做到这一点：
应用程序/config/config.php
/*
|--------------------------------------------------------------------------
| Session Variables
|--------------------------------------------------------------------------
|
| 'sess_cookie_name' = the name you want for the cookie
| 'sess_expiration' = the number of SECONDS you want the session to last.
| by default sessions last 7200 seconds (two hours). Set to zero for no expiration.
| 'sess_expire_on_close' = Whether to cause the session to expire automatically
| when the browser window is closed
| 'sess_encrypt_cookie' = Whether to encrypt the cookie
| 'sess_use_database' = Whether to save the session data to a database
| 'sess_table_name' = The name of the session database table
| 'sess_match_ip' = Whether to match the user's IP address when reading the session data
| 'sess_match_useragent' = Whether to match the User Agent when reading the session data
| 'sess_time_to_update' = how many seconds between CI refreshing Session Information
| 'sess_ignore_ip' = array of IP addresses to ignore
|
*/
$config['sess_cookie_name'] = 'ci_session';
$config['sess_expiration'] = 7200;
$config['sess_expire_on_close'] = FALSE;
$config['sess_encrypt_cookie'] = FALSE;
$config['sess_use_database'] = FALSE;
$config['sess_table_name'] = 'ci_sessions';
$config['sess_match_ip'] = FALSE;
$config['sess_match_useragent'] = TRUE;
$config['sess_time_to_update'] = 300;
$config['sess_ignore_ip'] = array('66.249.72.152', '0.0.0.0');
系统/库/session.php
/**
* Session Constructor
*
* The constructor runs the session routines automatically
* whenever the class is instantiated.
*/
public function __construct($params = array())
{
log_message('debug', "Session Class Initialized");
// Set the super object to a local variable for use throughout the class
$this->CI =& get_instance();
// Set all the session preferences, which can either be set
// manually via the $params array above or via the config file
foreach (array('sess_encrypt_cookie', 'sess_use_database', 'sess_table_name', 'sess_expiration', 'sess_expire_on_close', 'sess_match_ip', 'sess_match_useragent', 'sess_cookie_name', 'cookie_path', 'cookie_domain', 'cookie_secure', 'sess_time_to_update', 'time_reference', 'cookie_prefix', 'encryption_key', 'sess_ignore_ip') as $key)
{
$this->$key = (isset($params[$key])) ? $params[$key] : $this->CI->config->item($key);
}
if ($this->encryption_key == '')
{
show_error('In order to use the Session class you are required to set an encryption key in your config file.');
}
// Load the string helper so we can use the strip_slashes() function
$this->CI->load->helper('string');
// Do we need encryption? If so, load the encryption class
if ($this->sess_encrypt_cookie == TRUE)
{
$this->CI->load->library('encrypt');
}
// Are we using a database? If so, load it
if ($this->sess_use_database === TRUE AND $this->sess_table_name != '')
{
$this->CI->load->database();
}
// Set the "now" time. Can either be GMT or server time, based on the
// config prefs. We use this to set the "last activity" time
$this->now = $this->_get_time();
// Set the session length. If the session expiration is
// set to zero we'll set the expiration two years from now.
if ($this->sess_expiration == 0)
{
$this->sess_expiration = (60*60*24*365*2);
}
// Set the cookie name
$this->sess_cookie_name = $this->cookie_prefix.$this->sess_cookie_name;
$ip_address = $this->CI->input->ip_address();
if(!isset($this->sess_ignore_ip) || empty($this->sess_ignore_ip) || !in_array($ip_address, $this->sess_ignore_ip))
{
// Run the Session routine. If a session doesn't exist we'll
// create a new one. If it does, we'll update it.
if ( ! $this->sess_read())
{
$this->sess_create();
}
else
{
$this->sess_update();
}
}
// Delete 'old' flashdata (from last request)
$this->_flashdata_sweep();
// Mark all new flashdata as old (data will be deleted before next request)
$this->_flashdata_mark();
// Delete expired sessions if necessary
$this->_sess_gc();
log_message('debug', "Session routines successfully run");
}
/**
* Garbage collection
*
* This deletes expired session rows from database
* if the probability percentage is met
*
* @access public
* @return void
*/
function _sess_gc()
{
if ($this->sess_use_database != TRUE)
{
return;
}
srand(time());
if ((rand() % 100) < $this->gc_probability)
{
$expire = $this->now - $this->sess_expiration;
$this->CI->db->where("last_activity < {$expire}");
if(isset($this->sess_ignore_ip) && !empty($this->sess_ignore_ip))
$this->db->where_in('ip_address', $this->sess_ignore_ip);
$this->CI->db->delete($this->sess_table_name);
log_message('debug', 'Session garbage collection performed.');
}
}
配置文件包含要忽略的 IP 地址数组。
在会话库中，我更新了构造函数，以便它检查当前 IP 地址是否存在于上述配置设置中，如果存在，则跳过创建或更新会话的代码。
除此之外，_sess_gc我还添加了新的 where_in 语句，该语句将删除 IP 与配置中的 IP 匹配的所有会话行。如果你实现了构造方法，你就不需要这部分了。
我建议不要修改核心文件，我建议扩展会话类，所以接下来在./app/libraries/中创建MY_Session.php文件并粘贴下一个代码
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
* ------------------------------------------------------------------------
* CI Session Class Extension
* ------------------------------------------------------------------------
*
*/
class MY_Session extends CI_Session {
/**
* sess_update()
*
* Do not create session if it's in the cli environment
*
* @access public
* @return void
*/
public function sess_create()
{
$CI = get_instance();
$ip_address = $CI->input->ip_address();
if ( ($ip_address != '0.0.0.0' && $CI->input->user_agent() != '0') || $ip_address != '66.249.72.152'){
parent::sess_create();
}
}
}
/* End of file MY_Session.php */
/* Location: ./app/libraries/MY_Session.php */
?>
这行得通
如果您想使用 I created a library drop in 来查看这个user agent，通过他们的用户代理阻止机器人，使用简单的$this->agent->is_robot()检查 drop in session 扩展。
更改 ci_sessions 表并将 UNIQUE 约束添加到 ip_address 字段。这样就不会有重复的会话..
更复杂的方法是在插入时使用触发器。这将检查 IP 地址是否在您上面提到的两个地址之间。如果是，则不要插入数据库..