functions/global.php

   1 <?php
   2
   3 /**
   4  * global.php
   5  *
   6  * Copyright (c) 1999-2004 The SquirrelMail Project Team
   7  * Licensed under the GNU GPL. For full terms see the file COPYING.
   8  *
   9  * This includes code to update < 4.1.0 globals to the newer format
  10  * It also has some session register functions that work across various
  11  * php versions.
  12  *
  13  * @version $Id$
  14  * @package squirrelmail
  15  */
  16
  17 /** Bring in the config file. */
  18 require_once(SM_PATH . 'config/config.php');
  19
  20 /** set the name of the session cookie */
  21 if(isset($session_name) && $session_name) {
  22     ini_set('session.name' , $session_name);
  23 } else {
  24     ini_set('session.name' , 'SQMSESSID');
  25 }
  26
  27 /** If magic_quotes_runtime is on, SquirrelMail breaks in new and creative ways.
  28  *  Force magic_quotes_runtime off.
  29  *  tassium@squirrelmail.org - I put it here in the hopes that all SM code includes this.
  30  *  If there's a better place, please let me know.
  31  */
  32 ini_set('magic_quotes_runtime','0');
  33
  34 /* Since we decided all IMAP servers must implement the UID command as defined in
  35  * the IMAP RFC, we force $uid_support to be on.
  36  */
  37
  38 global $uid_support;
  39 $uid_support = true;
  40
  41 sqsession_is_active();
  42
  43 /* if running with magic_quotes_gpc then strip the slashes
  44    from POST and GET global arrays */
  45
  46 if (get_magic_quotes_gpc()) {
  47     sqstripslashes($_GET);
  48     sqstripslashes($_POST);
  49 }
  50
  51 /* strip any tags added to the url from PHP_SELF.
  52    This fixes hand crafted url XXS expoits for any
  53    page that uses PHP_SELF as the FORM action */
  54
  55 $_SERVER['PHP_SELF'] = strip_tags($_SERVER['PHP_SELF']);
  56
  57 /**
  58  * returns true if current php version is at mimimum a.b.c
  59  *
  60  * Called: check_php_version(4,1)
  61  * @param int a major version number
  62  * @param int b minor version number
  63  * @param int c release number
  64  * @return bool
  65  */
  66 function check_php_version ($a = '0', $b = '0', $c = '0')
  67 {
  68     global $SQ_PHP_VERSION;
  69
  70     if(!isset($SQ_PHP_VERSION))
  71         $SQ_PHP_VERSION = substr( str_pad( preg_replace('/\D/','', PHP_VERSION), 3, '0'), 0, 3);
  72
  73     return $SQ_PHP_VERSION >= ($a.$b.$c);
  74 }
  75
  76 /**
  77  * returns true if the current internal SM version is at minimum a.b.c
  78  * These are plain integer comparisons, as our internal version is
  79  * constructed by us, as an array of 3 ints.
  80  *
  81  * Called: check_sm_version(1,3,3)
  82  * @param int a major version number
  83  * @param int b minor version number
  84  * @param int c release number
  85  * @return bool
  86  */
  87 function check_sm_version($a = 0, $b = 0, $c = 0)
  88 {
  89     global $SQM_INTERNAL_VERSION;
  90     if ( !isset($SQM_INTERNAL_VERSION) ||
  91          $SQM_INTERNAL_VERSION[0] < $a ||
  92          $SQM_INTERNAL_VERSION[1] < $b ||
  93          ( $SQM_INTERNAL_VERSION[1] == $b &&
  94            $SQM_INTERNAL_VERSION[2] < $c ) ) {
  95         return FALSE;
  96     }
  97     return TRUE;
  98 }
  99
 100
 101 /**
 102  * Recursively strip slashes from the values of an array.
 103  * @param array array the array to strip, passed by reference
 104  * @return void
 105  */
 106 function sqstripslashes(&$array) {
 107     if(count($array) > 0) {
 108         foreach ($array as $index=>$value) {
 109             if (is_array($array[$index])) {
 110                 sqstripslashes($array[$index]);
 111             }
 112             else {
 113                 $array[$index] = stripslashes($value);
 114             }
 115         }
 116     }
 117 }
 118
 119 /**
 120  * Add a variable to the session.
 121  * @param mixed $var the variable to register
 122  * @param string $name the name to refer to this variable
 123  * @return void
 124  */
 125 function sqsession_register ($var, $name) {
 126
 127     sqsession_is_active();
 128
 129     $_SESSION["$name"] = $var;
 130
 131     session_register("$name");
 132 }
 133
 134 /**
 135  * Delete a variable from the session.
 136  * @param string $name the name of the var to delete
 137  * @return void
 138  */
 139 function sqsession_unregister ($name) {
 140
 141     sqsession_is_active();
 142
 143     unset($_SESSION[$name]);
 144
 145     session_unregister("$name");
 146 }
 147
 148 /**
 149  * Checks to see if a variable has already been registered
 150  * in the session.
 151  * @param string $name the name of the var to check
 152  * @return bool whether the var has been registered
 153  */
 154 function sqsession_is_registered ($name) {
 155     $test_name = &$name;
 156     $result = false;
 157
 158     if (isset($_SESSION[$test_name])) {
 159         $result = true;
 160     }
 161
 162     return $result;
 163 }
 164
 165
 166 define('SQ_INORDER',0);
 167 define('SQ_GET',1);
 168 define('SQ_POST',2);
 169 define('SQ_SESSION',3);
 170 define('SQ_COOKIE',4);
 171 define('SQ_SERVER',5);
 172 define('SQ_FORM',6);
 173
 174 /**
 175  * Search for the var $name in $_SESSION, $_POST, $_GET,
 176  * $_COOKIE, or $_SERVER and set it in provided var.
 177  *
 178  * If $search is not provided,  or == SQ_INORDER, it will search
 179  * $_SESSION, then $_POST, then $_GET. Otherwise,
 180  * use one of the defined constants to look for
 181  * a var in one place specifically.
 182  *
 183  * Note: $search is an int value equal to one of the
 184  * constants defined above.
 185  *
 186  * example:
 187  *    sqgetGlobalVar('username',$username,SQ_SESSION);
 188  *  -- no quotes around last param!
 189  *
 190  * @param string name the name of the var to search
 191  * @param mixed value the variable to return
 192  * @param int search constant defining where to look
 193  * @return bool whether variable is found.
 194  */
 195 function sqgetGlobalVar($name, &$value, $search = SQ_INORDER) {
 196
 197     /* NOTE: DO NOT enclose the constants in the switch
 198        statement with quotes. They are constant values,
 199        enclosing them in quotes will cause them to evaluate
 200        as strings. */
 201     switch ($search) {
 202         /* we want the default case to be first here,
 203            so that if a valid value isn't specified,
 204            all three arrays will be searched. */
 205       default:
 206       case SQ_INORDER: // check session, post, get
 207       case SQ_SESSION:
 208         if( isset($_SESSION[$name]) ) {
 209             $value = $_SESSION[$name];
 210             return TRUE;
 211         } elseif ( $search == SQ_SESSION ) {
 212             break;
 213         }
 214       case SQ_FORM:   // check post, get
 215       case SQ_POST:
 216         if( isset($_POST[$name]) ) {
 217             $value = $_POST[$name];
 218             return TRUE;
 219         } elseif ( $search == SQ_POST ) {
 220           break;
 221         }
 222       case SQ_GET:
 223         if ( isset($_GET[$name]) ) {
 224             $value = $_GET[$name];
 225             return TRUE;
 226         }
 227         /* NO IF HERE. FOR SQ_INORDER CASE, EXIT after GET */
 228         break;
 229       case SQ_COOKIE:
 230         if ( isset($_COOKIE[$name]) ) {
 231             $value = $_COOKIE[$name];
 232             return TRUE;
 233         }
 234         break;
 235       case SQ_SERVER:
 236         if ( isset($_SERVER[$name]) ) {
 237             $value = $_SERVER[$name];
 238             return TRUE;
 239         }
 240         break;
 241     }
 242     return FALSE;
 243 }
 244
 245 /**
 246  * Deletes an existing session, more advanced than the standard PHP
 247  * session_destroy(), it explicitly deletes the cookies and global vars.
 248  */
 249 function sqsession_destroy() {
 250
 251     /*
 252      * php.net says we can kill the cookie by setting just the name:
 253      * http://www.php.net/manual/en/function.setcookie.php
 254      * maybe this will help fix the session merging again.
 255      *
 256      * Changed the theory on this to kill the cookies first starting
 257      * a new session will provide a new session for all instances of
 258      * the browser, we don't want that, as that is what is causing the
 259      * merging of sessions.
 260      */
 261
 262     global $base_uri;
 263
 264     if (isset($_COOKIE[session_name()])) setcookie(session_name(), '', time() - 5, $base_uri);
 265     if (isset($_COOKIE['username'])) setcookie('username','',time() - 5,$base_uri);
 266     if (isset($_COOKIE['key'])) setcookie('key','',time() - 5,$base_uri);
 267
 268     $sessid = session_id();
 269     if (!empty( $sessid )) {
 270         $_SESSION = array();
 271         @session_destroy();
 272     }
 273
 274 }
 275
 276 /**
 277  * Function to verify a session has been started.  If it hasn't
 278  * start a session up.  php.net doesn't tell you that $_SESSION
 279  * (even though autoglobal), is not created unless a session is
 280  * started, unlike $_POST, $_GET and such
 281  */
 282
 283 function sqsession_is_active() {
 284
 285     $sessid = session_id();
 286     if ( empty( $sessid ) ) {
 287         session_start();
 288     }
 289 }
 290
 291
 292 ?>