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session.inc
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session.inc
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<?php
/*
+-----------------------------------------------------------------------+
| program/include/session.inc |
| |
| This file is part of the RoundCube Webmail client |
| Copyright (C) 2005-2007, RoundCube Dev. - Switzerland |
| Licensed under the GNU GPL |
| |
| PURPOSE: |
| Provide database supported session management |
| |
+-----------------------------------------------------------------------+
| Author: Thomas Bruederli <roundcube@gmail.com> |
+-----------------------------------------------------------------------+
$Id$
*/
function sess_open($save_path, $session_name)
{
return TRUE;
}
function sess_close()
{
return TRUE;
}
// read session data
function sess_read($key)
{
global $DB, $SESS_CHANGED, $SESS_CLIENT_IP;
if ($DB->is_error())
return FALSE;
$sql_result = $DB->query("SELECT vars, ip, ".$DB->unixtimestamp('changed')." AS changed
FROM ".get_table_name('session')."
WHERE sess_id=?",
$key);
if ($sql_arr = $DB->fetch_assoc($sql_result))
{
$SESS_CHANGED = $sql_arr['changed'];
$SESS_CLIENT_IP = $sql_arr['ip'];
if (strlen($sql_arr['vars']))
return $sql_arr['vars'];
}
return FALSE;
}
// save session data
function sess_write($key, $vars)
{
global $DB;
if ($DB->is_error())
return FALSE;
$sql_result = $DB->query("SELECT 1
FROM ".get_table_name('session')."
WHERE sess_id=?",
$key);
if ($DB->num_rows($sql_result))
{
session_decode($vars);
$DB->query("UPDATE ".get_table_name('session')."
SET vars=?,
changed=".$DB->now()."
WHERE sess_id=?",
$vars,
$key);
}
else
{
$DB->query("INSERT INTO ".get_table_name('session')."
(sess_id, vars, ip, created, changed)
VALUES (?, ?, ?, ".$DB->now().", ".$DB->now().")",
$key,
$vars,
$_SERVER['REMOTE_ADDR']);
}
return TRUE;
}
// handler for session_destroy()
function sess_destroy($key)
{
global $DB;
if ($DB->is_error())
return FALSE;
// delete session entries in cache table
$DB->query("DELETE FROM ".get_table_name('cache')."
WHERE session_id=?",
$key);
$DB->query("DELETE FROM ".get_table_name('session')."
WHERE sess_id=?",
$key);
return TRUE;
}
// garbage collecting function
function sess_gc($maxlifetime)
{
global $DB;
if ($DB->is_error())
return FALSE;
// get all expired sessions
$sql_result = $DB->query("SELECT sess_id
FROM ".get_table_name('session')."
WHERE ".$DB->unixtimestamp($DB->now())."-".$DB->unixtimestamp('changed')." > ?",
$maxlifetime);
$a_exp_sessions = array();
while ($sql_arr = $DB->fetch_assoc($sql_result))
$a_exp_sessions[] = $sql_arr['sess_id'];
if (sizeof($a_exp_sessions))
{
// delete session cache records
$DB->query("DELETE FROM ".get_table_name('cache')."
WHERE session_id IN ('".join("','", $a_exp_sessions)."')");
// delete session records
$DB->query("DELETE FROM ".get_table_name('session')."
WHERE sess_id IN ('".join("','", $a_exp_sessions)."')");
}
// also run message cache GC
rcmail_message_cache_gc();
rcmail_temp_gc();
return TRUE;
}
function sess_regenerate_id()
{
$randlen = 32;
$randval = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
$random = "";
for ($i=1; $i <= $randlen; $i++)
$random .= substr($randval, rand(0,(strlen($randval) - 1)), 1);
// use md5 value for id or remove capitals from string $randval
$random = md5($random);
// delete old session record
sess_destroy(session_id());
session_id($random);
$cookie = session_get_cookie_params();
$_lifetime = $cookie['lifetime'] ? time() + $cookie['lifetime'] : 0;
setcookie(session_name(), '', time() - 3600);
setcookie(session_name(), $random, $_lifetime, $cookie['path'],
$cookie['domain']);
return true;
}
// set custom functions for PHP session management
session_set_save_handler('sess_open', 'sess_close', 'sess_read', 'sess_write', 'sess_destroy', 'sess_gc');
?>

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