functions/mime.php

   1 <?php
   2
   3 /**
   4  * mime.php
   5  *
   6  * This contains the functions necessary to detect and decode MIME
   7  * messages.
   8  *
   9  * @copyright &copy; 1999-2007 The SquirrelMail Project Team
  10  * @license http://opensource.org/licenses/gpl-license.php GNU Public License
  11  * @version $Id$
  12  * @package squirrelmail
  13  */
  14
  15 /**
  16  * dependency information
  17    functions       dependency
  18    mime_structure
  19         class/mime/Message.class.php
  20             Message::parseStructure
  21         functions/page_header.php
  22             displayPageHeader
  23         functions/display_messages.php
  24             plain_error_message
  25    mime_fetch_body
  26         functions/imap_general.php
  27             sqimap_run_command
  28    mime_print_body_lines
  29
  30
  31
  32 functions/imap.php
  33 functions/attachment_common.php
  34 functions/display_messages.php
  35
  36 magicHtml => url_parser
  37 translateText => url_parser
  38
  39 */
  40
  41
  42 /* -------------------------------------------------------------------------- */
  43 /* MIME DECODING                                                              */
  44 /* -------------------------------------------------------------------------- */
  45
  46 /**
  47  * Get the MIME structure
  48  *
  49  * This function gets the structure of a message and stores it in the "message" class.
  50  * It will return this object for use with all relevant header information and
  51  * fully parsed into the standard "message" object format.
  52  */
  53 function mime_structure ($bodystructure, $flags=array()) {
  54
  55     /* Isolate the body structure and remove beginning and end parenthesis. */
  56     $read = trim(substr ($bodystructure, strpos(strtolower($bodystructure), 'bodystructure') + 13));
  57     $read = trim(substr ($read, 0, -1));
  58     $i = 0;
  59     $msg = Message::parseStructure($read,$i);
  60
  61     if (!is_object($msg)) {
  62         global $color, $mailbox;
  63         /* removed urldecode because $_GET is auto urldecoded ??? */
  64         displayPageHeader( $color, $mailbox );
  65         $errormessage  = _("SquirrelMail could not decode the bodystructure of the message");
  66         $errormessage .= '<br />'._("The bodystructure provided by your IMAP server:").'<br /><br />';
  67         $errormessage .= '<pre>' . htmlspecialchars($read) . '</pre>';
  68         plain_error_message( $errormessage, $color );
  69         echo '</body></html>';
  70         exit;
  71     }
  72     if (count($flags)) {
  73         foreach ($flags as $flag) {
  74 //FIXME: please document why it is we have to check the first char of the flag but we then go ahead and do a full string comparison anyway.  Is this a speed enhancement?  If not, let's keep it simple and just compare the full string and forget the switch block.
  75             $char = strtoupper($flag{1});
  76             switch ($char) {
  77                 case 'S':
  78                     if (strtolower($flag) == '\\seen') {
  79                         $msg->is_seen = true;
  80                     }
  81                     break;
  82                 case 'A':
  83                     if (strtolower($flag) == '\\answered') {
  84                         $msg->is_answered = true;
  85                     }
  86                     break;
  87                 case 'D':
  88                     if (strtolower($flag) == '\\deleted') {
  89                         $msg->is_deleted = true;
  90                     }
  91                     break;
  92                 case 'F':
  93                     if (strtolower($flag) == '\\flagged') {
  94                         $msg->is_flagged = true;
  95                     }
  96                     break;
  97                 case 'M':
  98                     if (strtolower($flag) == '$mdnsent') {
  99                         $msg->is_mdnsent = true;
 100                     }
 101                     break;
 102                 default:
 103                     break;
 104             }
 105         }
 106     }
 107     //    listEntities($msg);
 108     return $msg;
 109 }
 110
 111
 112
 113 /* This starts the parsing of a particular structure.  It is called recursively,
 114  * so it can be passed different structures.  It returns an object of type
 115  * $message.
 116  * First, it checks to see if it is a multipart message.  If it is, then it
 117  * handles that as it sees is necessary.  If it is just a regular entity,
 118  * then it parses it and adds the necessary header information (by calling out
 119  * to mime_get_elements()
 120  */
 121
 122 function mime_fetch_body($imap_stream, $id, $ent_id=1, $fetch_size=0) {
 123     /* Do a bit of error correction.  If we couldn't find the entity id, just guess
 124      * that it is the first one.  That is usually the case anyway.
 125      */
 126
 127     if (!$ent_id) {
 128         $cmd = "FETCH $id BODY[]";
 129     } else {
 130         $cmd = "FETCH $id BODY[$ent_id]";
 131     }
 132
 133     if ($fetch_size!=0) $cmd .= "<0.$fetch_size>";
 134
 135     $data = sqimap_run_command ($imap_stream, $cmd, true, $response, $message, TRUE);
 136     do {
 137         $topline = trim(array_shift($data));
 138     } while($topline && ($topline[0] == '*') && !preg_match('/\* [0-9]+ FETCH.*/i', $topline)) ;
 139
 140     $wholemessage = implode('', $data);
 141     if (ereg('\\{([^\\}]*)\\}', $topline, $regs)) {
 142         $ret = substr($wholemessage, 0, $regs[1]);
 143         /* There is some information in the content info header that could be important
 144          * in order to parse html messages. Let's get them here.
 145          */
 146 //        if ($ret{0} == '<') {
 147 //            $data = sqimap_run_command ($imap_stream, "FETCH $id BODY[$ent_id.MIME]", true, $response, $message, TRUE);
 148 //        }
 149     } else if (ereg('"([^"]*)"', $topline, $regs)) {
 150         $ret = $regs[1];
 151     } else {
 152         global $where, $what, $mailbox, $passed_id, $startMessage;
 153         $par = 'mailbox=' . urlencode($mailbox) . '&amp;passed_id=' . $passed_id;
 154         if (isset($where) && isset($what)) {
 155             $par .= '&amp;where=' . urlencode($where) . '&amp;what=' . urlencode($what);
 156         } else {
 157             $par .= '&amp;startMessage=' . $startMessage . '&amp;show_more=0';
 158         }
 159         $par .= '&amp;response=' . urlencode($response) .
 160             '&amp;message='  . urlencode($message)  .
 161             '&amp;topline='  . urlencode($topline);
 162
 163         echo '<tt><br />' .
 164             '<table width="80%"><tr>' .
 165             '<tr><td colspan="2">' .
 166             _("Body retrieval error. The reason for this is most probably that the message is malformed.") .
 167             '</td></tr>' .
 168             '<tr><td><b>' . _("Command:") . "</td><td>$cmd</td></tr>" .
 169             '<tr><td><b>' . _("Response:") . "</td><td>$response</td></tr>" .
 170             '<tr><td><b>' . _("Message:") . "</td><td>$message</td></tr>" .
 171             '<tr><td><b>' . _("FETCH line:") . "</td><td>$topline</td></tr>" .
 172             "</table><br /></tt></font><hr />";
 173
 174         $data = sqimap_run_command ($imap_stream, "FETCH $passed_id BODY[]", true, $response, $message, TRUE);
 175         array_shift($data);
 176         $wholemessage = implode('', $data);
 177
 178         $ret = $wholemessage;
 179     }
 180     return $ret;
 181 }
 182
 183 function mime_print_body_lines ($imap_stream, $id, $ent_id=1, $encoding, $rStream='php://stdout') {
 184
 185     /* Don't kill the connection if the browser is over a dialup
 186      * and it would take over 30 seconds to download it.
 187      * Don't call set_time_limit in safe mode.
 188      */
 189
 190     if (!ini_get('safe_mode')) {
 191         set_time_limit(0);
 192     }
 193     /* in case of base64 encoded attachments, do not buffer them.
 194        Instead, echo the decoded attachment directly to screen */
 195     if (strtolower($encoding) == 'base64') {
 196         if (!$ent_id) {
 197             $query = "FETCH $id BODY[]";
 198         } else {
 199             $query = "FETCH $id BODY[$ent_id]";
 200         }
 201         sqimap_run_command($imap_stream,$query,true,$response,$message,TRUE,'sqimap_base64_decode',$rStream,true);
 202     } else {
 203         $body = mime_fetch_body ($imap_stream, $id, $ent_id);
 204         if (is_resource($rStream)) {
 205             fputs($rStream,decodeBody($body,$encoding));
 206         } else {
 207             echo decodeBody($body, $encoding);
 208         }
 209     }
 210
 211     /*
 212        TODO, use the same method for quoted printable.
 213        However, I assume that quoted printable attachments aren't that large
 214        so the performancegain / memory usage drop will be minimal.
 215        If we decide to add that then we need to adapt sqimap_fread because
 216        we need to split te result on \n and fread doesn't stop at \n. That
 217        means we also should provide $results from sqimap_fread (by ref) to
 218        te function and set $no_return to false. The $filter function for
 219        quoted printable should handle unsetting of $results.
 220      */
 221     /*
 222        TODO 2: find out how we write to the output stream php://stdout. fwrite
 223        doesn't work because 'php://stdout isn't a stream.
 224      */
 225
 226     return;
 227 }
 228
 229 /* -[ END MIME DECODING ]----------------------------------------------------------- */
 230
 231 /* This is here for debugging purposes.  It will print out a list
 232  * of all the entity IDs that are in the $message object.
 233  */
 234 function listEntities ($message) {
 235     if ($message) {
 236         echo "<tt>" . $message->entity_id . ' : ' . $message->type0 . '/' . $message->type1 . ' parent = '. $message->parent->entity_id. '<br />';
 237         for ($i = 0; isset($message->entities[$i]); $i++) {
 238             echo "$i : ";
 239             $msg = listEntities($message->entities[$i]);
 240
 241             if ($msg) {
 242                 echo "return: ";
 243                 return $msg;
 244             }
 245         }
 246     }
 247 }
 248
 249 function getPriorityStr($priority) {
 250     $priority_level = substr($priority,0,1);
 251
 252     switch($priority_level) {
 253         /* Check for a higher then normal priority. */
 254         case '1':
 255         case '2':
 256             $priority_string = _("High");
 257             break;
 258
 259         /* Check for a lower then normal priority. */
 260         case '4':
 261         case '5':
 262             $priority_string = _("Low");
 263             break;
 264
 265         /* Check for a normal priority. */
 266         case '3':
 267         default:
 268             $priority_level = '3';
 269             $priority_string = _("Normal");
 270             break;
 271
 272     }
 273     return $priority_string;
 274 }
 275
 276 /* returns a $message object for a particular entity id */
 277 function getEntity ($message, $ent_id) {
 278     return $message->getEntity($ent_id);
 279 }
 280
 281 /* translateText
 282  * Extracted from strings.php 23/03/2002
 283  */
 284
 285 function translateText(&$body, $wrap_at, $charset) {
 286     global $where, $what;   /* from searching */
 287     global $color;          /* color theme */
 288
 289     // require_once(SM_PATH . 'functions/url_parser.php');
 290
 291     $body_ary = explode("\n", $body);
 292     for ($i=0; $i < count($body_ary); $i++) {
 293         $line = $body_ary[$i];
 294         if (strlen($line) - 2 >= $wrap_at) {
 295             sqWordWrap($line, $wrap_at, $charset);
 296         }
 297         $line = charset_decode($charset, $line);
 298         $line = str_replace("\t", '        ', $line);
 299
 300         parseUrl ($line);
 301
 302         $quotes = 0;
 303         $pos = 0;
 304         $j = strlen($line);
 305
 306         while ($pos < $j) {
 307             if ($line[$pos] == ' ') {
 308                 $pos++;
 309             } else if (strpos($line, '&gt;', $pos) === $pos) {
 310                 $pos += 4;
 311                 $quotes++;
 312             } else {
 313                 break;
 314             }
 315         }
 316
 317         if ($quotes % 2) {
 318             $line = '<span class="quote1">' . $line . '</span>';
 319         } elseif ($quotes) {
 320             $line = '<span class="quote2">' . $line . '</span>';
 321         }
 322
 323         $body_ary[$i] = $line;
 324     }
 325     $body = '<pre>' . implode("\n", $body_ary) . '</pre>';
 326 }
 327
 328 /**
 329  * This returns a parsed string called $body. That string can then
 330  * be displayed as the actual message in the HTML. It contains
 331  * everything needed, including HTML Tags, Attachments at the
 332  * bottom, etc.
 333  *
 334  * Since 1.2.0 function uses message_body hook.
 335  * Till 1.3.0 function included output of formatAttachments().
 336  *
 337  * @param resource $imap_stream imap connection resource
 338  * @param object $message squirrelmail message object
 339  * @param array $color squirrelmail color theme array
 340  * @param integer $wrap_at number of characters per line
 341  * @param string $ent_num (since 1.3.0) message part id
 342  * @param integer $id (since 1.3.0) message id
 343  * @param string $mailbox (since 1.3.0) imap folder name
 344  * @param boolean $clean (since 1.5.1) Do not output stuff that's irrelevant for the printable version.
 345  * @return string html formated message text
 346  */
 347 function formatBody($imap_stream, $message, $color, $wrap_at, $ent_num, $id, $mailbox='INBOX', $clean=FALSE) {
 348     /* This if statement checks for the entity to show as the
 349      * primary message. To add more of them, just put them in the
 350      * order that is their priority.
 351      */
 352     global $startMessage, $languages, $squirrelmail_language,
 353            $show_html_default, $sort, $has_unsafe_images, $passed_ent_id,
 354            $use_iframe, $iframe_height, $download_and_unsafe_link,
 355            $download_href, $unsafe_image_toggle_href, $unsafe_image_toggle_text,
 356            $oTemplate;
 357
 358     $nbsp = $oTemplate->fetch('non_breaking_space.tpl');
 359
 360     // workaround for not updated config.php
 361     if (! isset($use_iframe)) $use_iframe = false;
 362
 363     if( !sqgetGlobalVar('view_unsafe_images', $view_unsafe_images, SQ_GET) ) {
 364         $view_unsafe_images = false;
 365     }
 366
 367     $body = '';
 368     $urlmailbox = urlencode($mailbox);
 369     $body_message = getEntity($message, $ent_num);
 370     if (($body_message->header->type0 == 'text') ||
 371             ($body_message->header->type0 == 'rfc822')) {
 372         $body = mime_fetch_body ($imap_stream, $id, $ent_num);
 373         $body = decodeBody($body, $body_message->header->encoding);
 374
 375         if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
 376                 function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_decode')) {
 377             if (mb_detect_encoding($body) != 'ASCII') {
 378                 $body = call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_decode',$body);
 379             }
 380         }
 381
 382         /* As of 1.5.2, $body is passed (and modified) by reference */
 383         do_hook('message_body', $body);
 384
 385         /* If there are other types that shouldn't be formatted, add
 386          * them here.
 387          */
 388
 389         if ($body_message->header->type1 == 'html') {
 390             if ($show_html_default <> 1) {
 391                 $entity_conv = array('&nbsp;' => ' ',
 392                                      '<p>'    => "\n",
 393                                      '<P>'    => "\n",
 394                                      '<br>'   => "\n",
 395                                      '<BR>'   => "\n",
 396                                      '<br />' => "\n",
 397                                      '<BR />' => "\n",
 398                                      '&gt;'   => '>',
 399                                      '&lt;'   => '<');
 400                 $body = strtr($body, $entity_conv);
 401                 $body = strip_tags($body);
 402                 $body = trim($body);
 403                 translateText($body, $wrap_at,
 404                         $body_message->header->getParameter('charset'));
 405             } elseif ($use_iframe && ! $clean) {
 406                 // $clean is used to remove iframe in printable view.
 407
 408                 /**
 409                  * If we don't add html message between iframe tags,
 410                  * we must detect unsafe images and modify $has_unsafe_images.
 411                  */
 412                 $html_body = magicHTML($body, $id, $message, $mailbox);
 413                 // Convert character set in order to display html mails in different character set
 414                 $html_body = charset_decode($body_message->header->getParameter('charset'),$html_body,false,true);
 415
 416                 // creating iframe url
 417                 $iframeurl=sqm_baseuri().'src/view_html.php?'
 418                     . 'mailbox=' . $urlmailbox
 419                     . '&amp;passed_id=' . $id
 420                     . '&amp;ent_id=' . $ent_num
 421                     . '&amp;view_unsafe_images=' . (int) $view_unsafe_images;
 422
 423                 global $oTemplate;
 424                 $oTemplate->assign('iframe_url', $iframeurl);
 425                 $oTemplate->assign('html_body', $html_body);
 426
 427                 $body = $oTemplate->fetch('read_html_iframe.tpl');
 428             } else {
 429                 // old way of html rendering
 430                 /**
 431                  * convert character set. charset_decode does not remove html special chars
 432                  * applied by magicHTML functions and does not sanitize them second time if
 433                  * fourth argument is true.
 434                  */
 435                 $charset = $body_message->header->getParameter('charset');
 436                 if (!empty($charset)) {
 437                     $body = charset_decode($charset,$body,false,true);
 438                 }
 439                 $body = magicHTML($body, $id, $message, $mailbox);
 440             }
 441         } else {
 442             translateText($body, $wrap_at,
 443                     $body_message->header->getParameter('charset'));
 444         }
 445
 446         // if this is the clean display (i.e. printer friendly), stop here.
 447         if ( $clean ) {
 448             return $body;
 449         }
 450
 451         $download_and_unsafe_link = '';
 452
 453         $link = 'passed_id=' . $id . '&amp;ent_id='.$ent_num.
 454             '&amp;mailbox=' . $urlmailbox .'&amp;sort=' . $sort .
 455             '&amp;startMessage=' . $startMessage . '&amp;show_more=0';
 456         if (isset($passed_ent_id)) {
 457             $link .= '&amp;passed_ent_id='.$passed_ent_id;
 458         }
 459         $download_href = SM_PATH . 'src/download.php?absolute_dl=true&amp;' . $link;
 460         $download_and_unsafe_link .= "$nbsp|$nbsp"
 461             . create_hyperlink($download_href, _("Download this as a file"));
 462         if ($view_unsafe_images) {
 463             $text = _("Hide Unsafe Images");
 464         } else {
 465             if (isset($has_unsafe_images) && $has_unsafe_images) {
 466                 $link .= '&amp;view_unsafe_images=1';
 467                 $text = _("View Unsafe Images");
 468             } else {
 469                 $text = '';
 470             }
 471         }
 472         if($text != '') {
 473             $unsafe_image_toggle_href = SM_PATH . 'src/read_body.php?'.$link;
 474             $unsafe_image_toggle_text = $text;
 475             $download_and_unsafe_link .= "$nbsp|$nbsp"
 476                 . create_hyperlink($unsafe_image_toggle_href, $text);
 477         }
 478     }
 479     return $body;
 480 }
 481
 482 /**
 483  * Generate attachments array for passing to templates.  Separated from
 484  * formatAttachments() below so that the same array can be given to the
 485  * print-friendly version.
 486  *
 487  * @since 1.5.2
 488  * @param object $message SquirrelMail message object
 489  * @param array $exclude_id message parts that are not attachments.
 490  * @param string $mailbox mailbox name
 491  * @param integer $id message id
 492  */
 493 function buildAttachmentArray($message, $exclude_id, $mailbox, $id) {
 494     global $where, $what, $startMessage, $color, $passed_ent_id, $base_uri;
 495
 496     $att_ar = $message->getAttachments($exclude_id);
 497     $urlMailbox = urlencode($mailbox);
 498
 499     $attachments = array();
 500     foreach ($att_ar as $att) {
 501         $ent = $att->entity_id;
 502         $header = $att->header;
 503         $type0 = strtolower($header->type0);
 504         $type1 = strtolower($header->type1);
 505         $name = '';
 506         $links = array();
 507         $links['download link']['text'] = _("Download");
 508         $links['download link']['href'] = $base_uri .
 509             "src/download.php?absolute_dl=true&amp;passed_id=$id&amp;mailbox=$urlMailbox&amp;ent_id=$ent";
 510
 511         if ($type0 =='message' && $type1 == 'rfc822') {
 512             $default_page = $base_uri  . 'src/read_body.php';
 513             $rfc822_header = $att->rfc822_header;
 514             $filename = $rfc822_header->subject;
 515             if (trim( $filename ) == '') {
 516                 $filename = 'untitled-[' . $ent . ']' ;
 517             }
 518             $from_o = $rfc822_header->from;
 519             if (is_object($from_o)) {
 520                 $from_name = decodeHeader($from_o->getAddress(false));
 521             } elseif (is_array($from_o) && count($from_o) && is_object($from_o[0])) {
 522                 // something weird happens when a digest message is opened and you return to the digest
 523                 // now the from object is part of an array. Probably the parseHeader call overwrites the info
 524                 // retrieved from the bodystructure in a different way. We need to fix this later.
 525                 // possible starting point, do not fetch header we already have and inspect how
 526                 // the rfc822_header object behaves.
 527                 $from_name = decodeHeader($from_o[0]->getAddress(false));
 528             } else {
 529                 $from_name = _("Unknown sender");
 530             }
 531             $description = _("From").': '.$from_name;
 532         } else {
 533             $default_page = $base_uri  . 'src/download.php';
 534             $filename = $att->getFilename();
 535             if ($header->description) {
 536                 $description = decodeHeader($header->description);
 537             } else {
 538                 $description = '';
 539             }
 540         }
 541
 542         $display_filename = $filename;
 543         if (isset($passed_ent_id)) {
 544             $passed_ent_id_link = '&amp;passed_ent_id='.$passed_ent_id;
 545         } else {
 546             $passed_ent_id_link = '';
 547         }
 548         $defaultlink = $default_page . "?startMessage=$startMessage"
 549             . "&amp;passed_id=$id&amp;mailbox=$urlMailbox"
 550             . '&amp;ent_id='.$ent.$passed_ent_id_link;
 551         if ($where && $what) {
 552             $defaultlink .= '&amp;where='. urlencode($where).'&amp;what='.urlencode($what);
 553         }
 554         // IE does make use of mime content sniffing. Forcing a download
 555         // prohibit execution of XSS inside an application/octet-stream attachment
 556         if ($type0 == 'application' && $type1 == 'octet-stream') {
 557             $defaultlink .= '&amp;absolute_dl=true';
 558         }
 559
 560         /* This executes the attachment hook with a specific MIME-type.
 561          * If that doesn't have results, it tries if there's a rule
 562          * for a more generic type. Finally, a hook for ALL attachment
 563          * types is run as well.
 564          */
 565         /* The API for this hook has changed as of 1.5.2 so that all plugin
 566            arguments are passed in an array instead of each their own plugin
 567            argument, and arguments are passed by reference, so instead of
 568            returning any changes, changes should simply be made to the original
 569            arguments themselves. */
 570         do_hook("attachment $type0/$type1", $temp=array(&$links,
 571                 &$startMessage, &$id, &$urlMailbox, &$ent, &$defaultlink,
 572                 &$display_filename, &$where, &$what));
 573         if(count($links) <= 1) {
 574             /* The API for this hook has changed as of 1.5.2 so that all plugin
 575                arguments are passed in an array instead of each their own plugin
 576                argument, and arguments are passed by reference, so instead of
 577                returning any changes, changes should simply be made to the original
 578                arguments themselves. */
 579             do_hook("attachment $type0/*", $temp=array(&$links,
 580                     &$startMessage, &$id, &$urlMailbox, &$ent, &$defaultlink,
 581                     &$display_filename, &$where, &$what));
 582         }
 583         /* The API for this hook has changed as of 1.5.2 so that all plugin
 584            arguments are passed in an array instead of each their own plugin
 585            argument, and arguments are passed by reference, so instead of
 586            returning any changes, changes should simply be made to the original
 587            arguments themselves. */
 588         do_hook("attachment */*", $temp=array(&$links,
 589                 &$startMessage, &$id, &$urlMailbox, &$ent, &$defaultlink,
 590                 &$display_filename, &$where, &$what));
 591
 592         $this_attachment = array();
 593         $this_attachment['Name'] = decodeHeader($display_filename);
 594         $this_attachment['Description'] = $description;
 595         $this_attachment['DefaultHREF'] = $defaultlink;
 596         $this_attachment['DownloadHREF'] = $links['download link']['href'];
 597         $this_attachment['ViewHREF'] = isset($links['attachment_common']) ? $links['attachment_common']['href'] : '';
 598         $this_attachment['Size'] = $header->size;
 599         $this_attachment['ContentType'] = htmlspecialchars($type0 .'/'. $type1);
 600         $this_attachment['OtherLinks'] = array();
 601         foreach ($links as $val) {
 602             if ($val['text']==_("Download") || $val['text'] == _("View"))
 603                 continue;
 604             if (empty($val['text']) && empty($val['extra']))
 605                 continue;
 606
 607             $temp = array();
 608             $temp['HREF'] = $val['href'];
 609             $temp['Text'] = (empty($val['text']) ? '' : $val['text']) . (empty($val['extra']) ? '' : $val['extra']);
 610             $this_attachment['OtherLinks'][] = $temp;
 611         }
 612         $attachments[] = $this_attachment;
 613
 614         unset($links);
 615     }
 616
 617     return $attachments;
 618 }
 619
 620 /**
 621  * Displays attachment links and information
 622  *
 623  * Since 1.3.0 function is not included in formatBody() call.
 624  *
 625  * Since 1.0.2 uses attachment $type0/$type1 hook.
 626  * Since 1.2.5 uses attachment $type0/* hook.
 627  * Since 1.5.0 uses attachments_bottom hook.
 628  * Since 1.5.2 uses templates and does *not* return a value.
 629  *
 630  * @param object $message SquirrelMail message object
 631  * @param array $exclude_id message parts that are not attachments.
 632  * @param string $mailbox mailbox name
 633  * @param integer $id message id
 634  */
 635 function formatAttachments($message, $exclude_id, $mailbox, $id) {
 636     global $oTemplate;
 637
 638     $attach = buildAttachmentArray($message, $exclude_id, $mailbox, $id);
 639
 640     $oTemplate->assign('attachments', $attach);
 641     $oTemplate->display('read_attachments.tpl');
 642 }
 643
 644 function sqimap_base64_decode(&$string) {
 645
 646     // Base64 encoded data goes in pairs of 4 bytes. To achieve on the
 647     // fly decoding (to reduce memory usage) you have to check if the
 648     // data has incomplete pairs
 649
 650     // Remove the noise in order to check if the 4 bytes pairs are complete
 651     $string = str_replace(array("\r\n","\n", "\r", " "),array('','','',''),$string);
 652
 653     $sStringRem = '';
 654     $iMod = strlen($string) % 4;
 655     if ($iMod) {
 656         $sStringRem = substr($string,-$iMod);
 657         // Check if $sStringRem contains padding characters
 658         if (substr($sStringRem,-1) != '=') {
 659             $string = substr($string,0,-$iMod);
 660         } else {
 661             $sStringRem = '';
 662         }
 663     }
 664     $string = base64_decode($string);
 665     return $sStringRem;
 666 }
 667
 668 /**
 669  * Decodes encoded message body
 670  *
 671  * This function decodes the body depending on the encoding type.
 672  * Currently quoted-printable and base64 encodings are supported.
 673  * decode_body hook was added to this function in 1.4.2/1.5.0
 674  * @param string $body encoded message body
 675  * @param string $encoding used encoding
 676  * @return string decoded string
 677  * @since 1.0
 678  */
 679 function decodeBody($body, $encoding) {
 680
 681     $body = str_replace("\r\n", "\n", $body);
 682     $encoding = strtolower($encoding);
 683
 684     $encoding_handler = do_hook('decode_body', $encoding);
 685
 686
 687     // plugins get first shot at decoding the body
 688     //
 689     if (!empty($encoding_handler) && function_exists($encoding_handler)) {
 690         $body = $encoding_handler('decode', $body);
 691
 692     } elseif ($encoding == 'quoted-printable' ||
 693             $encoding == 'quoted_printable') {
 694         /**
 695          * quoted_printable_decode() function is broken in older
 696          * php versions. Text with \r\n decoding was fixed only
 697          * in php 4.3.0. Minimal code requirement 4.0.4 +
 698          * str_replace("\r\n", "\n", $body); call.
 699          */
 700         $body = quoted_printable_decode($body);
 701     } elseif ($encoding == 'base64') {
 702         $body = base64_decode($body);
 703     }
 704
 705     // All other encodings are returned raw.
 706     return $body;
 707 }
 708
 709 /**
 710  * Decodes headers
 711  *
 712  * This function decodes strings that are encoded according to
 713  * RFC1522 (MIME Part Two: Message Header Extensions for Non-ASCII Text).
 714  * Patched by Christian Schmidt <christian@ostenfeld.dk>  23/03/2002
 715  *
 716  * @param string $string header string that has to be made readable
 717  * @param boolean $utfencode change message in order to be readable on user's charset. defaults to true
 718  * @param boolean $htmlsave preserve spaces and sanitize html special characters. defaults to true
 719  * @param boolean $decide decide if string can be utfencoded. defaults to false
 720  * @return string decoded header string
 721  */
 722 function decodeHeader ($string, $utfencode=true,$htmlsave=true,$decide=false) {
 723     global $languages, $squirrelmail_language,$default_charset;
 724     if (is_array($string)) {
 725         $string = implode("\n", $string);
 726     }
 727
 728     if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
 729             function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_decodeheader')) {
 730         $string = call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_decodeheader', $string);
 731         // Do we need to return at this point?
 732         // return $string;
 733     }
 734     $i = 0;
 735     $iLastMatch = -2;
 736     $encoded = true;
 737
 738     $aString = explode(' ',$string);
 739     $ret = '';
 740     foreach ($aString as $chunk) {
 741         if ($encoded && $chunk === '') {
 742             continue;
 743         } elseif ($chunk === '') {
 744             $ret .= ' ';
 745             continue;
 746         }
 747         $encoded = false;
 748         /* if encoded words are not separated by a linear-space-white we still catch them */
 749         $j = $i-1;
 750
 751         while ($match = preg_match('/^(.*)=\?([^?]*)\?(Q|B)\?([^?]*)\?=(.*)$/Ui',$chunk,$res)) {
 752             /* if the last chunk isn't an encoded string then put back the space, otherwise don't */
 753             if ($iLastMatch !== $j) {
 754                 if ($htmlsave) {
 755                     $ret .= '&#32;';
 756                 } else {
 757                     $ret .= ' ';
 758                 }
 759             }
 760             $iLastMatch = $i;
 761             $j = $i;
 762             if ($htmlsave) {
 763                 $ret .= htmlspecialchars($res[1]);
 764             } else {
 765                 $ret .= $res[1];
 766             }
 767             $encoding = ucfirst($res[3]);
 768
 769             /* decide about valid decoding */
 770             if ($decide && is_conversion_safe($res[2])) {
 771                 $utfencode=true;
 772                 $can_be_encoded=true;
 773             } else {
 774                 $can_be_encoded=false;
 775             }
 776             switch ($encoding)
 777             {
 778                 case 'B':
 779                     $replace = base64_decode($res[4]);
 780                     if ($utfencode) {
 781                         if ($can_be_encoded) {
 782                             /* convert string to different charset,
 783                              * if functions asks for it (usually in compose)
 784                              */
 785                             $ret .= charset_convert($res[2],$replace,$default_charset,$htmlsave);
 786                         } else {
 787                             // convert string to html codes in order to display it
 788                             $ret .= charset_decode($res[2],$replace);
 789                         }
 790                     } else {
 791                         if ($htmlsave) {
 792                             $replace = htmlspecialchars($replace);
 793                         }
 794                         $ret.= $replace;
 795                     }
 796                     break;
 797                 case 'Q':
 798                     $replace = str_replace('_', ' ', $res[4]);
 799                     $replace = preg_replace('/=([0-9a-f]{2})/ie', 'chr(hexdec("\1"))',
 800                             $replace);
 801                     if ($utfencode) {
 802                         if ($can_be_encoded) {
 803                             /* convert string to different charset,
 804                              * if functions asks for it (usually in compose)
 805                              */
 806                             $replace = charset_convert($res[2], $replace,$default_charset,$htmlsave);
 807                         } else {
 808                             // convert string to html codes in order to display it
 809                             $replace = charset_decode($res[2], $replace);
 810                         }
 811                     } else {
 812                         if ($htmlsave) {
 813                             $replace = htmlspecialchars($replace);
 814                         }
 815                     }
 816                     $ret .= $replace;
 817                     break;
 818                 default:
 819                     break;
 820             }
 821             $chunk = $res[5];
 822             $encoded = true;
 823         }
 824         if (!$encoded) {
 825             if ($htmlsave) {
 826                 $ret .= '&#32;';
 827             } else {
 828                 $ret .= ' ';
 829             }
 830         }
 831
 832         if (!$encoded && $htmlsave) {
 833             $ret .= htmlspecialchars($chunk);
 834         } else {
 835             $ret .= $chunk;
 836         }
 837         ++$i;
 838     }
 839     /* remove the first added space */
 840     if ($ret) {
 841         if ($htmlsave) {
 842             $ret = substr($ret,5);
 843         } else {
 844             $ret = substr($ret,1);
 845         }
 846     }
 847
 848     return $ret;
 849 }
 850
 851 /**
 852  * Encodes header
 853  *
 854  * Function uses XTRA_CODE _encodeheader function, if such function exists.
 855  *
 856  * Function uses Q encoding by default and encodes a string according to RFC
 857  * 1522 for use in headers if it contains 8-bit characters or anything that
 858  * looks like it should be encoded.
 859  *
 860  * Function switches to B encoding and encodeHeaderBase64() function, if
 861  * string is 8bit and multibyte character set supported by mbstring extension
 862  * is used. It can cause E_USER_NOTICE errors, if interface is used with
 863  * multibyte character set unsupported by mbstring extension.
 864  *
 865  * @param string $string header string, that has to be encoded
 866  * @return string quoted-printable encoded string
 867  * @todo make $mb_charsets system wide constant
 868  */
 869 function encodeHeader ($string) {
 870     global $default_charset, $languages, $squirrelmail_language;
 871
 872     if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
 873             function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_encodeheader')) {
 874         return  call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_encodeheader', $string);
 875     }
 876
 877     // Use B encoding for multibyte charsets
 878     $mb_charsets = array('utf-8','big5','gb2313','euc-kr');
 879     if (in_array($default_charset,$mb_charsets) &&
 880         in_array($default_charset,sq_mb_list_encodings()) &&
 881         sq_is8bit($string)) {
 882         return encodeHeaderBase64($string,$default_charset);
 883     } elseif (in_array($default_charset,$mb_charsets) &&
 884               sq_is8bit($string) &&
 885               ! in_array($default_charset,sq_mb_list_encodings())) {
 886         // Add E_USER_NOTICE error here (can cause 'Cannot add header information' warning in compose.php)
 887         // trigger_error('encodeHeader: Multibyte character set unsupported by mbstring extension.',E_USER_NOTICE);
 888     }
 889
 890     // Encode only if the string contains 8-bit characters or =?
 891     $j = strlen($string);
 892     $max_l = 75 - strlen($default_charset) - 7;
 893     $aRet = array();
 894     $ret = '';
 895     $iEncStart = $enc_init = false;
 896     $cur_l = $iOffset = 0;
 897     for($i = 0; $i < $j; ++$i) {
 898         switch($string{$i})
 899         {
 900             case '=':
 901             case '<':
 902             case '>':
 903             case ',':
 904             case '?':
 905             case '_':
 906                 if ($iEncStart === false) {
 907                     $iEncStart = $i;
 908                 }
 909                 $cur_l+=3;
 910                 if ($cur_l > ($max_l-2)) {
 911                     /* if there is an stringpart that doesn't need encoding, add it */
 912                     $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
 913                     $aRet[] = "=?$default_charset?Q?$ret?=";
 914                     $iOffset = $i;
 915                     $cur_l = 0;
 916                     $ret = '';
 917                     $iEncStart = false;
 918                 } else {
 919                     $ret .= sprintf("=%02X",ord($string{$i}));
 920                 }
 921                 break;
 922             case '(':
 923             case ')':
 924                 if ($iEncStart !== false) {
 925                     $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
 926                     $aRet[] = "=?$default_charset?Q?$ret?=";
 927                     $iOffset = $i;
 928                     $cur_l = 0;
 929                     $ret = '';
 930                     $iEncStart = false;
 931                 }
 932                 break;
 933             case ' ':
 934                 if ($iEncStart !== false) {
 935                     $cur_l++;
 936                     if ($cur_l > $max_l) {
 937                         $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
 938                         $aRet[] = "=?$default_charset?Q?$ret?=";
 939                         $iOffset = $i;
 940                         $cur_l = 0;
 941                         $ret = '';
 942                         $iEncStart = false;
 943                     } else {
 944                         $ret .= '_';
 945                     }
 946                 }
 947                 break;
 948             default:
 949                 $k = ord($string{$i});
 950                 if ($k > 126) {
 951                     if ($iEncStart === false) {
 952                         // do not start encoding in the middle of a string, also take the rest of the word.
 953                         $sLeadString = substr($string,0,$i);
 954                         $aLeadString = explode(' ',$sLeadString);
 955                         $sToBeEncoded = array_pop($aLeadString);
 956                         $iEncStart = $i - strlen($sToBeEncoded);
 957                         $ret .= $sToBeEncoded;
 958                         $cur_l += strlen($sToBeEncoded);
 959                     }
 960                     $cur_l += 3;
 961                     /* first we add the encoded string that reached it's max size */
 962                     if ($cur_l > ($max_l-2)) {
 963                         $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
 964                         $aRet[] = "=?$default_charset?Q?$ret?= "; /* the next part is also encoded => separate by space */
 965                         $cur_l = 3;
 966                         $ret = '';
 967                         $iOffset = $i;
 968                         $iEncStart = $i;
 969                     }
 970                     $enc_init = true;
 971                     $ret .= sprintf("=%02X", $k);
 972                 } else {
 973                     if ($iEncStart !== false) {
 974                         $cur_l++;
 975                         if ($cur_l > $max_l) {
 976                             $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
 977                             $aRet[] = "=?$default_charset?Q?$ret?=";
 978                             $iEncStart = false;
 979                             $iOffset = $i;
 980                             $cur_l = 0;
 981                             $ret = '';
 982                         } else {
 983                             $ret .= $string{$i};
 984                         }
 985                     }
 986                 }
 987                 break;
 988         }
 989     }
 990
 991     if ($enc_init) {
 992         if ($iEncStart !== false) {
 993             $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
 994             $aRet[] = "=?$default_charset?Q?$ret?=";
 995         } else {
 996             $aRet[] = substr($string,$iOffset);
 997         }
 998         $string = implode('',$aRet);
 999     }
1000     return $string;
1001 }
1002
1003 /**
1004  * Encodes string according to rfc2047 B encoding header formating rules
1005  *
1006  * It is recommended way to encode headers with character sets that store
1007  * symbols in more than one byte.
1008  *
1009  * Function requires mbstring support. If required mbstring functions are missing,
1010  * function returns false and sets E_USER_WARNING level error message.
1011  *
1012  * Minimal requirements - php 4.0.6 with mbstring extension. Please note,
1013  * that mbstring functions will generate E_WARNING errors, if unsupported
1014  * character set is used. mb_encode_mimeheader function provided by php
1015  * mbstring extension is not used in order to get better control of header
1016  * encoding.
1017  *
1018  * Used php code functions - function_exists(), trigger_error(), strlen()
1019  * (is used with charset names and base64 strings). Used php mbstring
1020  * functions - mb_strlen and mb_substr.
1021  *
1022  * Related documents: rfc 2045 (BASE64 encoding), rfc 2047 (mime header
1023  * encoding), rfc 2822 (header folding)
1024  *
1025  * @param string $string header string that must be encoded
1026  * @param string $charset character set. Must be supported by mbstring extension.
1027  * Use sq_mb_list_encodings() to detect supported charsets.
1028  * @return string string encoded according to rfc2047 B encoding formating rules
1029  * @since 1.5.1
1030  * @todo First header line can be wrapped to $iMaxLength - $HeaderFieldLength - 1
1031  * @todo Do we want to control max length of header?
1032  * @todo Do we want to control EOL (end-of-line) marker?
1033  * @todo Do we want to translate error message?
1034  */
1035 function encodeHeaderBase64($string,$charset) {
1036     /**
1037      * Check mbstring function requirements.
1038      */
1039     if (! function_exists('mb_strlen') ||
1040         ! function_exists('mb_substr')) {
1041         // set E_USER_WARNING
1042         trigger_error('encodeHeaderBase64: Required mbstring functions are missing.',E_USER_WARNING);
1043         // return false
1044         return false;
1045     }
1046
1047     // initial return array
1048     $aRet = array();
1049
1050     /**
1051      * header length = 75 symbols max (same as in encodeHeader)
1052      * remove $charset length
1053      * remove =? ? ?= (5 chars)
1054      * remove 2 more chars (\r\n ?)
1055      */
1056     $iMaxLength = 75 - strlen($charset) - 7;
1057
1058     // set first character position
1059     $iStartCharNum = 0;
1060
1061     // loop through all characters. count characters and not bytes.
1062     for ($iCharNum=1; $iCharNum<=mb_strlen($string,$charset); $iCharNum++) {
1063         // encode string from starting character to current character.
1064         $encoded_string = base64_encode(mb_substr($string,$iStartCharNum,$iCharNum-$iStartCharNum,$charset));
1065
1066         // Check encoded string length
1067         if(strlen($encoded_string)>$iMaxLength) {
1068             // if string exceeds max length, reduce number of encoded characters and add encoded string part to array
1069             $aRet[] = base64_encode(mb_substr($string,$iStartCharNum,$iCharNum-$iStartCharNum-1,$charset));
1070
1071             // set new starting character
1072             $iStartCharNum = $iCharNum-1;
1073
1074             // encode last char (in case it is last character in string)
1075             $encoded_string = base64_encode(mb_substr($string,$iStartCharNum,$iCharNum-$iStartCharNum,$charset));
1076         } // if string is shorter than max length - add next character
1077     }
1078
1079     // add last encoded string to array
1080     $aRet[] = $encoded_string;
1081
1082     // set initial return string
1083     $sRet = '';
1084
1085     // loop through encoded strings
1086     foreach($aRet as $string) {
1087         // TODO: Do we want to control EOL (end-of-line) marker
1088         if ($sRet!='') $sRet.= " ";
1089
1090         // add header tags and encoded string to return string
1091         $sRet.= '=?'.$charset.'?B?'.$string.'?=';
1092     }
1093
1094     return $sRet;
1095 }
1096
1097 /* This function trys to locate the entity_id of a specific mime element */
1098 function find_ent_id($id, $message) {
1099     for ($i = 0, $ret = ''; $ret == '' && $i < count($message->entities); $i++) {
1100         if ($message->entities[$i]->header->type0 == 'multipart')  {
1101             $ret = find_ent_id($id, $message->entities[$i]);
1102         } else {
1103             if (strcasecmp($message->entities[$i]->header->id, $id) == 0) {
1104 //                if (sq_check_save_extension($message->entities[$i])) {
1105                 return $message->entities[$i]->entity_id;
1106 //                }
1107             } elseif (!empty($message->entities[$i]->header->parameters['name'])) {
1108                 /**
1109                  * This is part of a fix for Outlook Express 6.x generating
1110                  * cid URLs without creating content-id headers
1111                  * @@JA - 20050207
1112                  */
1113                 if (strcasecmp($message->entities[$i]->header->parameters['name'], $id) == 0) {
1114                     return $message->entities[$i]->entity_id;
1115                 }
1116             }
1117         }
1118     }
1119     return $ret;
1120 }
1121
1122 function sq_check_save_extension($message) {
1123     $filename = $message->getFilename();
1124     $ext = substr($filename, strrpos($filename,'.')+1);
1125     $save_extensions = array('jpg','jpeg','gif','png','bmp');
1126     return in_array($ext, $save_extensions);
1127 }
1128
1129
1130 /**
1131  ** HTMLFILTER ROUTINES
1132  */
1133
1134 /**
1135  * This function checks attribute values for entity-encoded values
1136  * and returns them translated into 8-bit strings so we can run
1137  * checks on them.
1138  *
1139  * @param  $attvalue A string to run entity check against.
1140  * @return           Nothing, modifies a reference value.
1141  */
1142 function sq_defang(&$attvalue){
1143     $me = 'sq_defang';
1144     /**
1145      * Skip this if there aren't ampersands or backslashes.
1146      */
1147     if (strpos($attvalue, '&') === false
1148         && strpos($attvalue, '\\') === false){
1149         return;
1150     }
1151     $m = false;
1152     // before deent, translate the dangerous unicode characters and ... to safe values
1153     // otherwise the regular expressions do not match.
1154
1155
1156
1157     do {
1158         $m = false;
1159         $m = $m || sq_deent($attvalue, '/\&#0*(\d+);*/s');
1160         $m = $m || sq_deent($attvalue, '/\&#x0*((\d|[a-f])+);*/si', true);
1161         $m = $m || sq_deent($attvalue, '/\\\\(\d+)/s', true);
1162     } while ($m == true);
1163     $attvalue = stripslashes($attvalue);
1164 }
1165
1166 /**
1167  * Kill any tabs, newlines, or carriage returns. Our friends the
1168  * makers of the browser with 95% market value decided that it'd
1169  * be funny to make "java[tab]script" be just as good as "javascript".
1170  *
1171  * @param  attvalue  The attribute value before extraneous spaces removed.
1172  * @return attvalue  Nothing, modifies a reference value.
1173  */
1174 function sq_unspace(&$attvalue){
1175     $me = 'sq_unspace';
1176     if (strcspn($attvalue, "\t\r\n\0 ") != strlen($attvalue)){
1177         $attvalue = str_replace(Array("\t", "\r", "\n", "\0", " "),
1178                                 Array('',   '',   '',   '',   ''), $attvalue);
1179     }
1180 }
1181
1182 /**
1183  * Translate all dangerous Unicode or Shift_JIS characters which are accepted by
1184  * IE as regular characters.
1185  *
1186  * @param  attvalue  The attribute value before dangerous characters are translated.
1187  * @return attvalue  Nothing, modifies a reference value.
1188  * @author Marc Groot Koerkamp.
1189  */
1190 function sq_fixIE_idiocy(&$attvalue) {
1191     // remove NUL
1192     $attvalue = str_replace("\0", "", $attvalue);
1193     // remove comments
1194     $attvalue = preg_replace("/(\/\*.*?\*\/)/","",$attvalue);
1195
1196     // IE has the evil habit of accepting every possible value for the attribute expression.
1197     // The table below contains characters which are parsed by IE if they are used in the "expression"
1198     // attribute value.
1199     $aDangerousCharsReplacementTable = array(
1200                         array('&#x029F;', '&#0671;' ,/* L UNICODE IPA Extension */
1201                               '&#x0280;', '&#0640;' ,/* R UNICODE IPA Extension */
1202                               '&#x0274;', '&#0628;' ,/* N UNICODE IPA Extension */
1203                               '&#xFF25;', '&#65317;' ,/* Unicode FULLWIDTH LATIN CAPITAL LETTER E */
1204                               '&#xFF45;', '&#65349;' ,/* Unicode FULLWIDTH LATIN SMALL LETTER E */
1205                               '&#xFF38;', '&#65336;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER X */
1206                               '&#xFF58;', '&#65368;',/* Unicode FULLWIDTH LATIN SMALL LETTER X */
1207                               '&#xFF30;', '&#65328;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER P */
1208                               '&#xFF50;', '&#65360;',/* Unicode FULLWIDTH LATIN SMALL LETTER P */
1209                               '&#xFF32;', '&#65330;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER R */
1210                               '&#xFF52;', '&#65362;',/* Unicode FULLWIDTH LATIN SMALL LETTER R */
1211                               '&#xFF33;', '&#65331;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER S */
1212                               '&#xFF53;', '&#65363;',/* Unicode FULLWIDTH LATIN SMALL LETTER S */
1213                               '&#xFF29;', '&#65321;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER I */
1214                               '&#xFF49;', '&#65353;',/* Unicode FULLWIDTH LATIN SMALL LETTER I */
1215                               '&#xFF2F;', '&#65327;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER O */
1216                               '&#xFF4F;', '&#65359;',/* Unicode FULLWIDTH LATIN SMALL LETTER O */
1217                               '&#xFF2E;', '&#65326;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER N */
1218                               '&#xFF4E;', '&#65358;',/* Unicode FULLWIDTH LATIN SMALL LETTER N */
1219                               '&#xFF2C;', '&#65324;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER L */
1220                               '&#xFF4C;', '&#65356;',/* Unicode FULLWIDTH LATIN SMALL LETTER L */
1221                               '&#xFF35;', '&#65333;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER U */
1222                               '&#xFF55;', '&#65365;',/* Unicode FULLWIDTH LATIN SMALL LETTER U */
1223                               '&#x207F;', '&#8319;' ,/* Unicode SUPERSCRIPT LATIN SMALL LETTER N */
1224                               "\xEF\xBC\xA5", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER E */   // in unicode this is some Chinese char range
1225                               "\xEF\xBD\x85", /* Shift JIS FULLWIDTH LATIN SMALL LETTER E */
1226                               "\xEF\xBC\xB8", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER X */
1227                               "\xEF\xBD\x98", /* Shift JIS FULLWIDTH LATIN SMALL LETTER X */
1228                               "\xEF\xBC\xB0", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER P */
1229                               "\xEF\xBD\x90", /* Shift JIS FULLWIDTH LATIN SMALL LETTER P */
1230                               "\xEF\xBC\xB2", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER R */
1231                               "\xEF\xBD\x92", /* Shift JIS FULLWIDTH LATIN SMALL LETTER R */
1232                               "\xEF\xBC\xB3", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER S */
1233                               "\xEF\xBD\x93", /* Shift JIS FULLWIDTH LATIN SMALL LETTER S */
1234                               "\xEF\xBC\xA9", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER I */
1235                               "\xEF\xBD\x89", /* Shift JIS FULLWIDTH LATIN SMALL LETTER I */
1236                               "\xEF\xBC\xAF", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER O */
1237                               "\xEF\xBD\x8F", /* Shift JIS FULLWIDTH LATIN SMALL LETTER O */
1238                               "\xEF\xBC\xAE", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER N */
1239                               "\xEF\xBD\x8E", /* Shift JIS FULLWIDTH LATIN SMALL LETTER N */
1240                               "\xEF\xBC\xAC", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER L */
1241                               "\xEF\xBD\x8C", /* Shift JIS FULLWIDTH LATIN SMALL LETTER L */
1242                               "\xEF\xBC\xB5", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER U */
1243                               "\xEF\xBD\x95", /* Shift JIS FULLWIDTH LATIN SMALL LETTER U */
1244                               "\xE2\x81\xBF", /* Shift JIS FULLWIDTH SUPERSCRIPT N */
1245                               "\xCA\x9F", /* L UNICODE IPA Extension */
1246                               "\xCA\x80", /* R UNICODE IPA Extension */
1247                               "\xC9\xB4"),  /* N UNICODE IPA Extension */
1248                        array('l', 'l', 'r','r','n','n',
1249                              'E','E','e','e','X','X','x','x','P','P','p','p','R','R','r','r','S','S','s','s','I','I',
1250                              'i','i','O','O','o','o','N','N','n','n','L','L','l','l','U','U','u','u','n','n',
1251                              'E','e','X','x','P','p','R','r','S','s','I','i','O','o','N','n','L','l','U','u','n','l','r','n'));
1252     $attvalue = str_replace($aDangerousCharsReplacementTable[0],$aDangerousCharsReplacementTable[1],$attvalue);
1253
1254     // Escapes are useful for special characters like "{}[]()'&. In other cases they are
1255     // used for XSS.
1256     $attvalue = preg_replace("/(\\\\)([a-zA-Z]{1})/",'$2',$attvalue);
1257 }
1258
1259 /**
1260  * This function returns the final tag out of the tag name, an array
1261  * of attributes, and the type of the tag. This function is called by
1262  * sq_sanitize internally.
1263  *
1264  * @param  $tagname  the name of the tag.
1265  * @param  $attary   the array of attributes and their values
1266  * @param  $tagtype  The type of the tag (see in comments).
1267  * @return           a string with the final tag representation.
1268  */
1269 function sq_tagprint($tagname, $attary, $tagtype){
1270     $me = 'sq_tagprint';
1271
1272     if ($tagtype == 2){
1273         $fulltag = '</' . $tagname . '>';
1274     } else {
1275         $fulltag = '<' . $tagname;
1276         if (is_array($attary) && sizeof($attary)){
1277             $atts = Array();
1278             while (list($attname, $attvalue) = each($attary)){
1279                 array_push($atts, "$attname=$attvalue");
1280             }
1281             $fulltag .= ' ' . join(" ", $atts);
1282         }
1283         if ($tagtype == 3){
1284             $fulltag .= ' /';
1285         }
1286         $fulltag .= '>';
1287     }
1288     return $fulltag;
1289 }
1290
1291 /**
1292  * A small helper function to use with array_walk. Modifies a by-ref
1293  * value and makes it lowercase.
1294  *
1295  * @param  $val a value passed by-ref.
1296  * @return      void since it modifies a by-ref value.
1297  */
1298 function sq_casenormalize(&$val){
1299     $val = strtolower($val);
1300 }
1301
1302 /**
1303  * This function skips any whitespace from the current position within
1304  * a string and to the next non-whitespace value.
1305  *
1306  * @param  $body   the string
1307  * @param  $offset the offset within the string where we should start
1308  *                 looking for the next non-whitespace character.
1309  * @return         the location within the $body where the next
1310  *                 non-whitespace char is located.
1311  */
1312 function sq_skipspace($body, $offset){
1313     $me = 'sq_skipspace';
1314     preg_match('/^(\s*)/s', substr($body, $offset), $matches);
1315     if (sizeof($matches{1})){
1316         $count = strlen($matches{1});
1317         $offset += $count;
1318     }
1319     return $offset;
1320 }
1321
1322 /**
1323  * This function looks for the next character within a string.  It's
1324  * really just a glorified "strpos", except it catches if failures
1325  * nicely.
1326  *
1327  * @param  $body   The string to look for needle in.
1328  * @param  $offset Start looking from this position.
1329  * @param  $needle The character/string to look for.
1330  * @return         location of the next occurance of the needle, or
1331  *                 strlen($body) if needle wasn't found.
1332  */
1333 function sq_findnxstr($body, $offset, $needle){
1334     $me  = 'sq_findnxstr';
1335     $pos = strpos($body, $needle, $offset);
1336     if ($pos === FALSE){
1337         $pos = strlen($body);
1338     }
1339     return $pos;
1340 }
1341
1342 /**
1343  * This function takes a PCRE-style regexp and tries to match it
1344  * within the string.
1345  *
1346  * @param  $body   The string to look for needle in.
1347  * @param  $offset Start looking from here.
1348  * @param  $reg    A PCRE-style regex to match.
1349  * @return         Returns a false if no matches found, or an array
1350  *                 with the following members:
1351  *                 - integer with the location of the match within $body
1352  *                 - string with whatever content between offset and the match
1353  *                 - string with whatever it is we matched
1354  */
1355 function sq_findnxreg($body, $offset, $reg){
1356     $me = 'sq_findnxreg';
1357     $matches = Array();
1358     $retarr = Array();
1359     preg_match("%^(.*?)($reg)%si", substr($body, $offset), $matches);
1360     if (!isset($matches{0}) || !$matches{0}){
1361         $retarr = false;
1362     } else {
1363         $retarr{0} = $offset + strlen($matches{1});
1364         $retarr{1} = $matches{1};
1365         $retarr{2} = $matches{2};
1366     }
1367     return $retarr;
1368 }
1369
1370 /**
1371  * This function looks for the next tag.
1372  *
1373  * @param  $body   String where to look for the next tag.
1374  * @param  $offset Start looking from here.
1375  * @return         false if no more tags exist in the body, or
1376  *                 an array with the following members:
1377  *                 - string with the name of the tag
1378  *                 - array with attributes and their values
1379  *                 - integer with tag type (1, 2, or 3)
1380  *                 - integer where the tag starts (starting "<")
1381  *                 - integer where the tag ends (ending ">")
1382  *                 first three members will be false, if the tag is invalid.
1383  */
1384 function sq_getnxtag($body, $offset){
1385     $me = 'sq_getnxtag';
1386     if ($offset > strlen($body)){
1387         return false;
1388     }
1389     $lt = sq_findnxstr($body, $offset, "<");
1390     if ($lt == strlen($body)){
1391         return false;
1392     }
1393     /**
1394      * We are here:
1395      * blah blah <tag attribute="value">
1396      * \---------^
1397      */
1398     $pos = sq_skipspace($body, $lt+1);
1399     if ($pos >= strlen($body)){
1400         return Array(false, false, false, $lt, strlen($body));
1401     }
1402     /**
1403      * There are 3 kinds of tags:
1404      * 1. Opening tag, e.g.:
1405      *    <a href="blah">
1406      * 2. Closing tag, e.g.:
1407      *    </a>
1408      * 3. XHTML-style content-less tag, e.g.:
1409      *    <img src="blah" />
1410      */
1411     $tagtype = false;
1412     switch (substr($body, $pos, 1)){
1413         case '/':
1414             $tagtype = 2;
1415             $pos++;
1416             break;
1417         case '!':
1418             /**
1419              * A comment or an SGML declaration.
1420              */
1421             if (substr($body, $pos+1, 2) == "--"){
1422                 $gt = strpos($body, "-->", $pos);
1423                 if ($gt === false){
1424                     $gt = strlen($body);
1425                 } else {
1426                     $gt += 2;
1427                 }
1428                 return Array(false, false, false, $lt, $gt);
1429             } else {
1430                 $gt = sq_findnxstr($body, $pos, ">");
1431                 return Array(false, false, false, $lt, $gt);
1432             }
1433             break;
1434         default:
1435             /**
1436              * Assume tagtype 1 for now. If it's type 3, we'll switch values
1437              * later.
1438              */
1439             $tagtype = 1;
1440             break;
1441     }
1442
1443     $tag_start = $pos;
1444     $tagname = '';
1445     /**
1446      * Look for next [\W-_], which will indicate the end of the tag name.
1447      */
1448     $regary = sq_findnxreg($body, $pos, "[^\w\-_]");
1449     if ($regary == false){
1450         return Array(false, false, false, $lt, strlen($body));
1451     }
1452     list($pos, $tagname, $match) = $regary;
1453     $tagname = strtolower($tagname);
1454
1455     /**
1456      * $match can be either of these:
1457      * '>'  indicating the end of the tag entirely.
1458      * '\s' indicating the end of the tag name.
1459      * '/'  indicating that this is type-3 xhtml tag.
1460      *
1461      * Whatever else we find there indicates an invalid tag.
1462      */
1463     switch ($match){
1464         case '/':
1465             /**
1466              * This is an xhtml-style tag with a closing / at the
1467              * end, like so: <img src="blah" />. Check if it's followed
1468              * by the closing bracket. If not, then this tag is invalid
1469              */
1470             if (substr($body, $pos, 2) == "/>"){
1471                 $pos++;
1472                 $tagtype = 3;
1473             } else {
1474                 $gt = sq_findnxstr($body, $pos, ">");
1475                 $retary = Array(false, false, false, $lt, $gt);
1476                 return $retary;
1477             }
1478         case '>':
1479             return Array($tagname, false, $tagtype, $lt, $pos);
1480             break;
1481         default:
1482             /**
1483              * Check if it's whitespace
1484              */
1485             if (!preg_match('/\s/', $match)){
1486                 /**
1487                  * This is an invalid tag! Look for the next closing ">".
1488                  */
1489                 $gt = sq_findnxstr($body, $lt, ">");
1490                 return Array(false, false, false, $lt, $gt);
1491             }
1492             break;
1493     }
1494
1495     /**
1496      * At this point we're here:
1497      * <tagname  attribute='blah'>
1498      * \-------^
1499      *
1500      * At this point we loop in order to find all attributes.
1501      */
1502     $attname = '';
1503     $atttype = false;
1504     $attary = Array();
1505
1506     while ($pos <= strlen($body)){
1507         $pos = sq_skipspace($body, $pos);
1508         if ($pos == strlen($body)){
1509             /**
1510              * Non-closed tag.
1511              */
1512             return Array(false, false, false, $lt, $pos);
1513         }
1514         /**
1515          * See if we arrived at a ">" or "/>", which means that we reached
1516          * the end of the tag.
1517          */
1518         $matches = Array();
1519         if (preg_match("%^(\s*)(>|/>)%s", substr($body, $pos), $matches)) {
1520             /**
1521              * Yep. So we did.
1522              */
1523             $pos += strlen($matches{1});
1524             if ($matches{2} == "/>"){
1525                 $tagtype = 3;
1526                 $pos++;
1527             }
1528             return Array($tagname, $attary, $tagtype, $lt, $pos);
1529         }
1530
1531         /**
1532          * There are several types of attributes, with optional
1533          * [:space:] between members.
1534          * Type 1:
1535          *   attrname[:space:]=[:space:]'CDATA'
1536          * Type 2:
1537          *   attrname[:space:]=[:space:]"CDATA"
1538          * Type 3:
1539          *   attr[:space:]=[:space:]CDATA
1540          * Type 4:
1541          *   attrname
1542          *
1543          * We leave types 1 and 2 the same, type 3 we check for
1544          * '"' and convert to "&quot" if needed, then wrap in
1545          * double quotes. Type 4 we convert into:
1546          * attrname="yes".
1547          */
1548         $regary = sq_findnxreg($body, $pos, "[^:\w\-_]");
1549         if ($regary == false){
1550             /**
1551              * Looks like body ended before the end of tag.
1552              */
1553             return Array(false, false, false, $lt, strlen($body));
1554         }
1555         list($pos, $attname, $match) = $regary;
1556         $attname = strtolower($attname);
1557         /**
1558          * We arrived at the end of attribute name. Several things possible
1559          * here:
1560          * '>'  means the end of the tag and this is attribute type 4
1561          * '/'  if followed by '>' means the same thing as above
1562          * '\s' means a lot of things -- look what it's followed by.
1563          *      anything else means the attribute is invalid.
1564          */
1565         switch($match){
1566             case '/':
1567                 /**
1568                  * This is an xhtml-style tag with a closing / at the
1569                  * end, like so: <img src="blah" />. Check if it's followed
1570                  * by the closing bracket. If not, then this tag is invalid
1571                  */
1572                 if (substr($body, $pos, 2) == "/>"){
1573                     $pos++;
1574                     $tagtype = 3;
1575                 } else {
1576                     $gt = sq_findnxstr($body, $pos, ">");
1577                     $retary = Array(false, false, false, $lt, $gt);
1578                     return $retary;
1579                 }
1580             case '>':
1581                 $attary{$attname} = '"yes"';
1582                 return Array($tagname, $attary, $tagtype, $lt, $pos);
1583                 break;
1584             default:
1585                 /**
1586                  * Skip whitespace and see what we arrive at.
1587                  */
1588                 $pos = sq_skipspace($body, $pos);
1589                 $char = substr($body, $pos, 1);
1590                 /**
1591                  * Two things are valid here:
1592                  * '=' means this is attribute type 1 2 or 3.
1593                  * \w means this was attribute type 4.
1594                  * anything else we ignore and re-loop. End of tag and
1595                  * invalid stuff will be caught by our checks at the beginning
1596                  * of the loop.
1597                  */
1598                 if ($char == "="){
1599                     $pos++;
1600                     $pos = sq_skipspace($body, $pos);
1601                     /**
1602                      * Here are 3 possibilities:
1603                      * "'"  attribute type 1
1604                      * '"'  attribute type 2
1605                      * everything else is the content of tag type 3
1606                      */
1607                     $quot = substr($body, $pos, 1);
1608                     if ($quot == "'"){
1609                         $regary = sq_findnxreg($body, $pos+1, "\'");
1610                         if ($regary == false){
1611                             return Array(false, false, false, $lt, strlen($body));
1612                         }
1613                         list($pos, $attval, $match) = $regary;
1614                         $pos++;
1615                         $attary{$attname} = "'" . $attval . "'";
1616                     } else if ($quot == '"'){
1617                         $regary = sq_findnxreg($body, $pos+1, '\"');
1618                         if ($regary == false){
1619                             return Array(false, false, false, $lt, strlen($body));
1620                         }
1621                         list($pos, $attval, $match) = $regary;
1622                         $pos++;
1623                         $attary{$attname} = '"' . $attval . '"';
1624                     } else {
1625                         /**
1626                          * These are hateful. Look for \s, or >.
1627                          */
1628                         $regary = sq_findnxreg($body, $pos, "[\s>]");
1629                         if ($regary == false){
1630                             return Array(false, false, false, $lt, strlen($body));
1631                         }
1632                         list($pos, $attval, $match) = $regary;
1633                         /**
1634                          * If it's ">" it will be caught at the top.
1635                          */
1636                         $attval = preg_replace("/\"/s", "&quot;", $attval);
1637                         $attary{$attname} = '"' . $attval . '"';
1638                     }
1639                 } else if (preg_match("|[\w/>]|", $char)) {
1640                     /**
1641                      * That was attribute type 4.
1642                      */
1643                     $attary{$attname} = '"yes"';
1644                 } else {
1645                     /**
1646                      * An illegal character. Find next '>' and return.
1647                      */
1648                     $gt = sq_findnxstr($body, $pos, ">");
1649                     return Array(false, false, false, $lt, $gt);
1650                 }
1651                 break;
1652         }
1653     }
1654     /**
1655      * The fact that we got here indicates that the tag end was never
1656      * found. Return invalid tag indication so it gets stripped.
1657      */
1658     return Array(false, false, false, $lt, strlen($body));
1659 }
1660
1661 /**
1662  * Translates entities into literal values so they can be checked.
1663  *
1664  * @param $attvalue the by-ref value to check.
1665  * @param $regex    the regular expression to check against.
1666  * @param $hex      whether the entites are hexadecimal.
1667  * @return          True or False depending on whether there were matches.
1668  */
1669 function sq_deent(&$attvalue, $regex, $hex=false){
1670     $me = 'sq_deent';
1671     $ret_match = false;
1672     // remove comments
1673     //$attvalue = preg_replace("/(\/\*.*\*\/)/","",$attvalue);
1674     preg_match_all($regex, $attvalue, $matches);
1675     if (is_array($matches) && sizeof($matches[0]) > 0){
1676         $repl = Array();
1677         for ($i = 0; $i < sizeof($matches[0]); $i++){
1678             $numval = $matches[1][$i];
1679             if ($hex){
1680                 $numval = hexdec($numval);
1681             }
1682             $repl{$matches[0][$i]} = chr($numval);
1683         }
1684         $attvalue = strtr($attvalue, $repl);
1685         return true;
1686     } else {
1687         return false;
1688     }
1689 }
1690
1691 /**
1692  * This function runs various checks against the attributes.
1693  *
1694  * @param  $tagname         String with the name of the tag.
1695  * @param  $attary          Array with all tag attributes.
1696  * @param  $rm_attnames     See description for sq_sanitize
1697  * @param  $bad_attvals     See description for sq_sanitize
1698  * @param  $add_attr_to_tag See description for sq_sanitize
1699  * @param  $message         message object
1700  * @param  $id              message id
1701  * @return                  Array with modified attributes.
1702  */
1703 function sq_fixatts($tagname,
1704                     $attary,
1705                     $rm_attnames,
1706                     $bad_attvals,
1707                     $add_attr_to_tag,
1708                     $message,
1709                     $id,
1710                     $mailbox
1711                     ){
1712     $me = 'sq_fixatts';
1713     while (list($attname, $attvalue) = each($attary)){
1714         /**
1715          * See if this attribute should be removed.
1716          */
1717         foreach ($rm_attnames as $matchtag=>$matchattrs){
1718             if (preg_match($matchtag, $tagname)){
1719                 foreach ($matchattrs as $matchattr){
1720                     if (preg_match($matchattr, $attname)){
1721                         unset($attary{$attname});
1722                         continue;
1723                     }
1724                 }
1725             }
1726         }
1727         /**
1728          * Workaround for IE quirks
1729          */
1730         sq_fixIE_idiocy($attvalue);
1731
1732         /**
1733          * Remove any backslashes, entities, and extraneous whitespace.
1734          */
1735
1736         $oldattvalue = $attvalue;
1737         sq_defang($attvalue);
1738         if ($attname == 'style' && $attvalue !== $oldattvalue) {
1739             // entities are used in the attribute value. In 99% of the cases it's there as XSS
1740             // i.e.<div style="{ left:exp&#x0280;essio&#x0274;( alert('XSS') ) }">
1741             $attvalue = "idiocy";
1742             $attary{$attname} = $attvalue;
1743         }
1744         sq_unspace($attvalue);
1745
1746         /**
1747          * Now let's run checks on the attvalues.
1748          * I don't expect anyone to comprehend this. If you do,
1749          * get in touch with me so I can drive to where you live and
1750          * shake your hand personally. :)
1751          */
1752         foreach ($bad_attvals as $matchtag=>$matchattrs){
1753             if (preg_match($matchtag, $tagname)){
1754                 foreach ($matchattrs as $matchattr=>$valary){
1755                     if (preg_match($matchattr, $attname)){
1756                         /**
1757                          * There are two arrays in valary.
1758                          * First is matches.
1759                          * Second one is replacements
1760                          */
1761                         list($valmatch, $valrepl) = $valary;
1762                         $newvalue =
1763                             preg_replace($valmatch, $valrepl, $attvalue);
1764                         if ($newvalue != $attvalue){
1765                             $attary{$attname} = $newvalue;
1766                             $attvalue = $newvalue;
1767                         }
1768                     }
1769                 }
1770             }
1771         }
1772         if ($attname == 'style') {
1773             if (preg_match('/[\0-\37\200-\377]+/',$attvalue)) {
1774                 // 8bit and control characters in style attribute values can be used for XSS, remove them
1775                 $attary{$attname} = '"disallowed character"';
1776             }
1777             preg_match_all("/url\s*\((.+)\)/si",$attvalue,$aMatch);
1778             if (count($aMatch)) {
1779                 foreach($aMatch[1] as $sMatch) {
1780                     // url value
1781                     $urlvalue = $sMatch;
1782                     sq_fix_url($attname, $urlvalue, $message, $id, $mailbox,"'");
1783                     $attary{$attname} = str_replace($sMatch,$urlvalue,$attvalue);
1784                 }
1785             }
1786         }
1787         /**
1788          * Use white list based filtering on attributes which can contain url's
1789          */
1790         else if ($attname == 'href' || $attname == 'src' || $attname == 'background') {
1791             sq_fix_url($attname, $attvalue, $message, $id, $mailbox);
1792             $attary{$attname} = $attvalue;
1793         }
1794     }
1795     /**
1796      * See if we need to append any attributes to this tag.
1797      */
1798     foreach ($add_attr_to_tag as $matchtag=>$addattary){
1799         if (preg_match($matchtag, $tagname)){
1800             $attary = array_merge($attary, $addattary);
1801         }
1802     }
1803     return $attary;
1804 }
1805
1806 /**
1807  * This function filters url's
1808  *
1809  * @param  $attvalue        String with attribute value to filter
1810  * @param  $message         message object
1811  * @param  $id               message id
1812  * @param  $mailbox         mailbox
1813  * @param  $sQuote          quoting characters around url's
1814  */
1815 function sq_fix_url($attname, &$attvalue, $message, $id, $mailbox,$sQuote = '"') {
1816     $attvalue = trim($attvalue);
1817     if ($attvalue && ($attvalue[0] =='"'|| $attvalue[0] == "'")) {
1818         // remove the double quotes
1819         $sQuote = $attvalue[0];
1820         $attvalue = trim(substr($attvalue,1,-1));
1821     }
1822
1823     if( !sqgetGlobalVar('view_unsafe_images', $view_unsafe_images, SQ_GET) ) {
1824         $view_unsafe_images = false;
1825     }
1826     $secremoveimg = '../images/' . _("sec_remove_eng.png");
1827
1828     /**
1829      * Replace empty src tags with the blank image.  src is only used
1830      * for frames, images, and image inputs.  Doing a replace should
1831      * not affect them working as should be, however it will stop
1832      * IE from being kicked off when src for img tags are not set
1833      */
1834     if ($attvalue == '') {
1835         $attvalue = '"' . SM_PATH . 'images/blank.png"';
1836     } else {
1837         // first, disallow 8 bit characters and control characters
1838         if (preg_match('/[\0-\37\200-\377]+/',$attvalue)) {
1839             switch ($attname) {
1840                 case 'href':
1841                     $attvalue = $sQuote . 'http://invalid-stuff-detected.example.com' . $sQuote;
1842                     break;
1843                 default:
1844                     $attvalue = $sQuote . SM_PATH . 'images/blank.png'. $sQuote;
1845                     break;
1846             }
1847         } else {
1848             $aUrl = parse_url($attvalue);
1849             if (isset($aUrl['scheme'])) {
1850                 switch(strtolower($aUrl['scheme'])) {
1851                     case 'http':
1852                     case 'https':
1853                     case 'ftp':
1854                         if ($attname != 'href') {
1855                             if ($view_unsafe_images == false) {
1856                                 $attvalue = $sQuote . $secremoveimg . $sQuote;
1857                             } else {
1858                                 if (isset($aUrl['path'])) {
1859                                     // validate image extension.
1860                                     $ext = strtolower(substr($aUrl['path'],strrpos($aUrl['path'],'.')));
1861                                     if (!in_array($ext,array('.jpeg','.jpg','xjpeg','.gif','.bmp','.jpe','.png','.xbm'))) {
1862                                         $attvalue = $sQuote . SM_PATH . 'images/blank.png'. $sQuote;
1863                                     }
1864                                 } else {
1865                                     $attvalue = $sQuote . SM_PATH . 'images/blank.png'. $sQuote;
1866                                 }
1867                             }
1868                         }
1869                         break;
1870                     case 'outbind':
1871                         /**
1872                          * "Hack" fix for Outlook using propriatary outbind:// protocol in img tags.
1873                          * One day MS might actually make it match something useful, for now, falling
1874                          * back to using cid2http, so we can grab the blank.png.
1875                          */
1876                         $attvalue = sq_cid2http($message, $id, $attvalue, $mailbox);
1877                         break;
1878                     case 'cid':
1879                         /**
1880                             * Turn cid: urls into http-friendly ones.
1881                             */
1882                         $attvalue = sq_cid2http($message, $id, $attvalue, $mailbox);
1883                         break;
1884                     default:
1885                         $attvalue = $sQuote . SM_PATH . 'images/blank.png' . $sQuote;
1886                         break;
1887                 }
1888             } else {
1889                 if (!(isset($aUrl['path']) && $aUrl['path'] == $secremoveimg)) {
1890                     // parse_url did not lead to satisfying result
1891                     $attvalue = $sQuote . SM_PATH . 'images/blank.png' . $sQuote;
1892                 }
1893             }
1894         }
1895     }
1896 }
1897
1898 /**
1899  * This function edits the style definition to make them friendly and
1900  * usable in SquirrelMail.
1901  *
1902  * @param  $message  the message object
1903  * @param  $id       the message id
1904  * @param  $content  a string with whatever is between <style> and </style>
1905  * @param  $mailbox  the message mailbox
1906  * @return           a string with edited content.
1907  */
1908 function sq_fixstyle($body, $pos, $message, $id, $mailbox){
1909     global $view_unsafe_images;
1910     $me = 'sq_fixstyle';
1911     // workaround for </style> in between comments
1912     $iCurrentPos = $pos;
1913     $content = '';
1914     $sToken = '';
1915     $bSucces = false;
1916     $bEndTag = false;
1917     for ($i=$pos,$iCount=strlen($body);$i<$iCount;++$i) {
1918         $char = $body{$i};
1919         switch ($char) {
1920             case '<':
1921                 $sToken .= $char;
1922                 break;
1923             case '/':
1924                  if ($sToken == '<') {
1925                     $sToken .= $char;
1926                     $bEndTag = true;
1927                  } else {
1928                     $content .= $char;
1929                  }
1930                  break;
1931             case '>':
1932                  if ($bEndTag) {
1933                     $sToken .= $char;
1934                     if (preg_match('/\<\/\s*style\s*\>/i',$sToken,$aMatch)) {
1935                         $newpos = $i + 1;
1936                         $bSucces = true;
1937                         break 2;
1938                     } else {
1939                         $content .= $sToken;
1940                     }
1941                     $bEndTag = false;
1942                  } else {
1943                     $content .= $char;
1944                  }
1945                  break;
1946             case '!':
1947                 if ($sToken == '<') {
1948                     // possible comment
1949                     if (isset($body{$i+2}) && substr($body,$i,3) == '!--') {
1950                         $i = strpos($body,'-->',$i+3);
1951                         if ($i === false) { // no end comment
1952                             $i = strlen($body);
1953                         }
1954                         $sToken = '';
1955                     }
1956                 } else {
1957                     $content .= $char;
1958                 }
1959                 break;
1960             default:
1961                 if ($bEndTag) {
1962                     $sToken .= $char;
1963                 } else {
1964                     $content .= $char;
1965                 }
1966                 break;
1967         }
1968     }
1969     if ($bSucces == FALSE){
1970         return array(FALSE, strlen($body));
1971     }
1972
1973
1974
1975     /**
1976     * First look for general BODY style declaration, which would be
1977     * like so:
1978     * body {background: blah-blah}
1979     * and change it to .bodyclass so we can just assign it to a <div>
1980     */
1981     $content = preg_replace("|body(\s*\{.*?\})|si", ".bodyclass\\1", $content);
1982     $secremoveimg = '../images/' . _("sec_remove_eng.png");
1983     /**
1984     * Fix url('blah') declarations.
1985     */
1986     //   $content = preg_replace("|url\s*\(\s*([\'\"])\s*\S+script\s*:.*?([\'\"])\s*\)|si",
1987     //                           "url(\\1$secremoveimg\\2)", $content);
1988
1989     // first check for 8bit sequences and disallowed control characters
1990     if (preg_match('/[\16-\37\200-\377]+/',$content)) {
1991         $content = '<!-- style block removed by html filter due to presence of 8bit characters -->';
1992         return array($content, $newpos);
1993     }
1994
1995     // IE Sucks hard. We have a special function for it.
1996     sq_fixIE_idiocy($content);
1997
1998     // remove @import line
1999     $content = preg_replace("/^\s*(@import.*)$/mi","\n<!-- @import rules forbidden -->\n",$content);
2000
2001     // translate ur\l and variations (IE parses that)
2002     // TODO check if the sq_fixIE_idiocy function already handles this.
2003     $content = preg_replace("/(\\\\)?u(\\\\)?r(\\\\)?l(\\\\)?/i", 'url', $content);
2004     preg_match_all("/url\s*\((.+)\)/si",$content,$aMatch);
2005     if (count($aMatch)) {
2006         $aValue = $aReplace = array();
2007         foreach($aMatch[1] as $sMatch) {
2008             // url value
2009             $urlvalue = $sMatch;
2010             sq_fix_url('style',$urlvalue, $message, $id, $mailbox,"'");
2011             $aValue[] = $sMatch;
2012             $aReplace[] = $urlvalue;
2013         }
2014         $content = str_replace($aValue,$aReplace,$content);
2015     }
2016
2017    /**
2018     * Remove any backslashes, entities, and extraneous whitespace.
2019     */
2020     $contentTemp = $content;
2021     sq_defang($contentTemp);
2022     sq_unspace($contentTemp);
2023
2024     /**
2025      * Fix stupid css declarations which lead to vulnerabilities
2026      * in IE.
2027      */
2028     $match   = Array('/\/\*.*\*\//',
2029                     '/expression/i',
2030                     '/behaviou*r/i',
2031                     '/binding/i',
2032                     '/include-source/i',
2033                     '/javascript/i',
2034                     '/script/i');
2035     $replace = Array('','idiocy', 'idiocy', 'idiocy', 'idiocy', 'idiocy', 'idiocy');
2036     $contentNew = preg_replace($match, $replace, $contentTemp);
2037     if ($contentNew !== $contentTemp) {
2038         // insecure css declarations are used. From now on we don't care
2039         // anymore if the css is destroyed by sq_deent, sq_unspace or sq_unbackslash
2040         $content = $contentNew;
2041     }
2042     return array($content, $newpos);
2043 }
2044
2045
2046 /**
2047  * This function converts cid: url's into the ones that can be viewed in
2048  * the browser.
2049  *
2050  * @param  $message  the message object
2051  * @param  $id       the message id
2052  * @param  $cidurl   the cid: url.
2053  * @param  $mailbox  the message mailbox
2054  * @return           a string with a http-friendly url
2055  */
2056 function sq_cid2http($message, $id, $cidurl, $mailbox){
2057     /**
2058      * Get rid of quotes.
2059      */
2060     $quotchar = substr($cidurl, 0, 1);
2061     if ($quotchar == '"' || $quotchar == "'"){
2062         $cidurl = str_replace($quotchar, "", $cidurl);
2063     } else {
2064         $quotchar = '';
2065     }
2066     $cidurl = substr(trim($cidurl), 4);
2067
2068     $match_str = '/\{.*?\}\//';
2069     $str_rep = '';
2070     $cidurl = preg_replace($match_str, $str_rep, $cidurl);
2071
2072     $linkurl = find_ent_id($cidurl, $message);
2073     /* in case of non-save cid links $httpurl should be replaced by a sort of
2074        unsave link image */
2075     $httpurl = '';
2076
2077     /**
2078      * This is part of a fix for Outlook Express 6.x generating
2079      * cid URLs without creating content-id headers. These images are
2080      * not part of the multipart/related html mail. The html contains
2081      * <img src="cid:{some_id}/image_filename.ext"> references to
2082      * attached images with as goal to render them inline although
2083      * the attachment disposition property is not inline.
2084      */
2085
2086     if (empty($linkurl)) {
2087         if (preg_match('/{.*}\//', $cidurl)) {
2088             $cidurl = preg_replace('/{.*}\//','', $cidurl);
2089             if (!empty($cidurl)) {
2090                 $linkurl = find_ent_id($cidurl, $message);
2091             }
2092         }
2093     }
2094
2095     if (!empty($linkurl)) {
2096         $httpurl = $quotchar . SM_PATH . 'src/download.php?absolute_dl=true&amp;' .
2097             "passed_id=$id&amp;mailbox=" . urlencode($mailbox) .
2098             '&amp;ent_id=' . $linkurl . $quotchar;
2099     } else {
2100         /**
2101          * If we couldn't generate a proper img url, drop in a blank image
2102          * instead of sending back empty, otherwise it causes unusual behaviour
2103          */
2104         $httpurl = $quotchar . SM_PATH . 'images/blank.png' . $quotchar;
2105     }
2106
2107     return $httpurl;
2108 }
2109
2110 /**
2111  * This function changes the <body> tag into a <div> tag since we
2112  * can't really have a body-within-body.
2113  *
2114  * @param  $attary   an array of attributes and values of <body>
2115  * @param  $mailbox  mailbox we're currently reading (for cid2http)
2116  * @param  $message  current message (for cid2http)
2117  * @param  $id       current message id (for cid2http)
2118  * @return           a modified array of attributes to be set for <div>
2119  */
2120 function sq_body2div($attary, $mailbox, $message, $id){
2121     $me = 'sq_body2div';
2122     $divattary = Array('class' => "'bodyclass'");
2123     $text = '#000000';
2124     $has_bgc_stl = $has_txt_stl = false;
2125     $styledef = '';
2126     if (is_array($attary) && sizeof($attary) > 0){
2127         foreach ($attary as $attname=>$attvalue){
2128             $quotchar = substr($attvalue, 0, 1);
2129             $attvalue = str_replace($quotchar, "", $attvalue);
2130             switch ($attname){
2131                 case 'background':
2132                     $attvalue = sq_cid2http($message, $id, $attvalue, $mailbox);
2133                     $styledef .= "background-image: url('$attvalue'); ";
2134                     break;
2135                 case 'bgcolor':
2136                     $has_bgc_stl = true;
2137                     $styledef .= "background-color: $attvalue; ";
2138                     break;
2139                 case 'text':
2140                     $has_txt_stl = true;
2141                     $styledef .= "color: $attvalue; ";
2142                     break;
2143             }
2144         }
2145         // Outlook defines a white bgcolor and no text color. This can lead to
2146         // white text on a white bg with certain themes.
2147         if ($has_bgc_stl && !$has_txt_stl) {
2148             $styledef .= "color: $text; ";
2149         }
2150         if (strlen($styledef) > 0){
2151             $divattary{"style"} = "\"$styledef\"";
2152         }
2153     }
2154     return $divattary;
2155 }
2156
2157 /**
2158  * This is the main function and the one you should actually be calling.
2159  * There are several variables you should be aware of an which need
2160  * special description.
2161  *
2162  * Since the description is quite lengthy, see it here:
2163  * http://linux.duke.edu/projects/mini/htmlfilter/
2164  *
2165  * @param $body                 the string with HTML you wish to filter
2166  * @param $tag_list             see description above
2167  * @param $rm_tags_with_content see description above
2168  * @param $self_closing_tags    see description above
2169  * @param $force_tag_closing    see description above
2170  * @param $rm_attnames          see description above
2171  * @param $bad_attvals          see description above
2172  * @param $add_attr_to_tag      see description above
2173  * @param $message              message object
2174  * @param $id                   message id
2175  * @return                      sanitized html safe to show on your pages.
2176  */
2177 function sq_sanitize($body,
2178                      $tag_list,
2179                      $rm_tags_with_content,
2180                      $self_closing_tags,
2181                      $force_tag_closing,
2182                      $rm_attnames,
2183                      $bad_attvals,
2184                      $add_attr_to_tag,
2185                      $message,
2186                      $id,
2187                      $mailbox
2188                      ){
2189     $me = 'sq_sanitize';
2190     $rm_tags = array_shift($tag_list);
2191     /**
2192      * Normalize rm_tags and rm_tags_with_content.
2193      */
2194     @array_walk($tag_list, 'sq_casenormalize');
2195     @array_walk($rm_tags_with_content, 'sq_casenormalize');
2196     @array_walk($self_closing_tags, 'sq_casenormalize');
2197     /**
2198      * See if tag_list is of tags to remove or tags to allow.
2199      * false  means remove these tags
2200      * true   means allow these tags
2201      */
2202     $curpos = 0;
2203     $open_tags = Array();
2204     $trusted = "\n<!-- begin sanitized html -->\n";
2205     $skip_content = false;
2206     /**
2207      * Take care of netscape's stupid javascript entities like
2208      * &{alert('boo')};
2209      */
2210     $body = preg_replace("/&(\{.*?\};)/si", "&amp;\\1", $body);
2211
2212     while (($curtag = sq_getnxtag($body, $curpos)) != FALSE){
2213         list($tagname, $attary, $tagtype, $lt, $gt) = $curtag;
2214         $free_content = substr($body, $curpos, $lt-$curpos);
2215         /**
2216          * Take care of <style>
2217          */
2218         if ($tagname == "style" && $tagtype == 1){
2219             list($free_content, $curpos) =
2220                 sq_fixstyle($body, $gt+1, $message, $id, $mailbox);
2221             if ($free_content != FALSE){
2222                 $trusted .= sq_tagprint($tagname, $attary, $tagtype);
2223                 $trusted .= $free_content;
2224                 $trusted .= sq_tagprint($tagname, false, 2);
2225             }
2226             continue;
2227         }
2228         if ($skip_content == false){
2229             $trusted .= $free_content;
2230         }
2231         if ($tagname != FALSE){
2232             if ($tagtype == 2){
2233                 if ($skip_content == $tagname){
2234                     /**
2235                      * Got to the end of tag we needed to remove.
2236                      */
2237                     $tagname = false;
2238                     $skip_content = false;
2239                 } else {
2240                     if ($skip_content == false){
2241                         if ($tagname == "body"){
2242                             $tagname = "div";
2243                         }
2244                         if (isset($open_tags{$tagname}) &&
2245                                 $open_tags{$tagname} > 0){
2246                             $open_tags{$tagname}--;
2247                         } else {
2248                             $tagname = false;
2249                         }
2250                     }
2251                 }
2252             } else {
2253                 /**
2254                  * $rm_tags_with_content
2255                  */
2256                 if ($skip_content == false){
2257                     /**
2258                      * See if this is a self-closing type and change
2259                      * tagtype appropriately.
2260                      */
2261                     if ($tagtype == 1
2262                             && in_array($tagname, $self_closing_tags)){
2263                         $tagtype = 3;
2264                     }
2265                     /**
2266                      * See if we should skip this tag and any content
2267                      * inside it.
2268                      */
2269                     if ($tagtype == 1 &&
2270                             in_array($tagname, $rm_tags_with_content)){
2271                         $skip_content = $tagname;
2272                     } else {
2273                         if (($rm_tags == false
2274                                     && in_array($tagname, $tag_list)) ||
2275                                 ($rm_tags == true &&
2276                                  !in_array($tagname, $tag_list))){
2277                             $tagname = false;
2278                         } else {
2279                             /**
2280                              * Convert body into div.
2281                              */
2282                             if ($tagname == "body"){
2283                                 $tagname = "div";
2284                                 $attary = sq_body2div($attary, $mailbox,
2285                                         $message, $id);
2286                             }
2287                             if ($tagtype == 1){
2288                                 if (isset($open_tags{$tagname})){
2289                                     $open_tags{$tagname}++;
2290                                 } else {
2291                                     $open_tags{$tagname}=1;
2292                                 }
2293                             }
2294                             /**
2295                              * This is where we run other checks.
2296                              */
2297                             if (is_array($attary) && sizeof($attary) > 0){
2298                                 $attary = sq_fixatts($tagname,
2299                                                      $attary,
2300                                                      $rm_attnames,
2301                                                      $bad_attvals,
2302                                                      $add_attr_to_tag,
2303                                                      $message,
2304                                                      $id,
2305                                                      $mailbox
2306                                                      );
2307                             }
2308                         }
2309                     }
2310                 }
2311             }
2312             if ($tagname != false && $skip_content == false){
2313                 $trusted .= sq_tagprint($tagname, $attary, $tagtype);
2314             }
2315         }
2316         $curpos = $gt+1;
2317     }
2318     $trusted .= substr($body, $curpos, strlen($body)-$curpos);
2319     if ($force_tag_closing == true){
2320         foreach ($open_tags as $tagname=>$opentimes){
2321             while ($opentimes > 0){
2322                 $trusted .= '</' . $tagname . '>';
2323                 $opentimes--;
2324             }
2325         }
2326         $trusted .= "\n";
2327     }
2328     $trusted .= "<!-- end sanitized html -->\n";
2329     return $trusted;
2330 }
2331
2332 /**
2333  * This is a wrapper function to call html sanitizing routines.
2334  *
2335  * @param  $body  the body of the message
2336  * @param  $id    the id of the message
2337
2338  * @param  $message
2339  * @param  $mailbox
2340  * @param  boolean $take_mailto_links When TRUE, converts mailto: links
2341  *                                    into internal SM compose links
2342  *                                    (optional; default = TRUE)
2343  * @return        a string with html safe to display in the browser.
2344  */
2345 function magicHTML($body, $id, $message, $mailbox = 'INBOX', $take_mailto_links =true) {
2346
2347     // require_once(SM_PATH . 'functions/url_parser.php');  // for $MailTo_PReg_Match
2348
2349     global $attachment_common_show_images, $view_unsafe_images,
2350            $has_unsafe_images;
2351     /**
2352      * Don't display attached images in HTML mode.
2353      *
2354      * SB: why?
2355      */
2356     $attachment_common_show_images = false;
2357     $tag_list = Array(
2358             false,
2359             "object",
2360             "meta",
2361             "html",
2362             "head",
2363             "base",
2364             "link",
2365             "frame",
2366             "iframe",
2367             "plaintext",
2368             "marquee"
2369             );
2370
2371     $rm_tags_with_content = Array(
2372             "script",
2373             "applet",
2374             "embed",
2375             "title",
2376             "frameset",
2377             "xmp",
2378             "xml"
2379             );
2380
2381     $self_closing_tags =  Array(
2382             "img",
2383             "br",
2384             "hr",
2385             "input",
2386             "outbind"
2387             );
2388
2389     $force_tag_closing = true;
2390
2391     $rm_attnames = Array(
2392             "/.*/" =>
2393             Array(
2394                 "/target/i",
2395                 "/^on.*/i",
2396                 "/^dynsrc/i",
2397                 "/^data.*/i",
2398                 "/^lowsrc.*/i"
2399                 )
2400             );
2401
2402     $secremoveimg = "../images/" . _("sec_remove_eng.png");
2403     $bad_attvals = Array(
2404             "/.*/" =>
2405             Array(
2406                 "/^src|background/i" =>
2407                 Array(
2408                     Array(
2409                         "/^([\'\"])\s*\S+script\s*:.*([\'\"])/si",
2410                         "/^([\'\"])\s*mocha\s*:*.*([\'\"])/si",
2411                         "/^([\'\"])\s*about\s*:.*([\'\"])/si"
2412                         ),
2413                     Array(
2414                         "\\1$secremoveimg\\2",
2415                         "\\1$secremoveimg\\2",
2416                         "\\1$secremoveimg\\2",
2417                         )
2418                     ),
2419                 "/^href|action/i" =>
2420                 Array(
2421                     Array(
2422                         "/^([\'\"])\s*\S+script\s*:.*([\'\"])/si",
2423                         "/^([\'\"])\s*mocha\s*:*.*([\'\"])/si",
2424                         "/^([\'\"])\s*about\s*:.*([\'\"])/si"
2425                         ),
2426                     Array(
2427                         "\\1#\\1",
2428                         "\\1#\\1",
2429                         "\\1#\\1"
2430                         )
2431                     ),
2432         "/^style/i" =>
2433             Array(
2434                 Array(
2435                     "/\/\*.*\*\//",
2436                     "/expression/i",
2437                     "/binding/i",
2438                     "/behaviou*r/i",
2439                     "/include-source/i",
2440                     "/position\s*:\s*absolute/i",
2441                     "/(\\\\)?u(\\\\)?r(\\\\)?l(\\\\)?/i",
2442                     "/url\s*\(\s*([\'\"])\s*\S+script\s*:.*([\'\"])\s*\)/si",
2443                     "/url\s*\(\s*([\'\"])\s*mocha\s*:.*([\'\"])\s*\)/si",
2444                     "/url\s*\(\s*([\'\"])\s*about\s*:.*([\'\"])\s*\)/si",
2445                     "/(.*)\s*:\s*url\s*\(\s*([\'\"]*)\s*\S+script\s*:.*([\'\"]*)\s*\)/si"
2446                     ),
2447                 Array(
2448                     "",
2449                     "idiocy",
2450                     "idiocy",
2451                     "idiocy",
2452                     "idiocy",
2453                     "idiocy",
2454                     "url",
2455                     "url(\\1#\\1)",
2456                     "url(\\1#\\1)",
2457                     "url(\\1#\\1)",
2458                     "\\1:url(\\2#\\3)"
2459                     )
2460                 )
2461             )
2462         );
2463     if( !sqgetGlobalVar('view_unsafe_images', $view_unsafe_images, SQ_GET) ) {
2464         $view_unsafe_images = false;
2465     }
2466     if (!$view_unsafe_images){
2467         /**
2468          * Remove any references to http/https if view_unsafe_images set
2469          * to false.
2470          */
2471         array_push($bad_attvals{'/.*/'}{'/^src|background/i'}[0],
2472                 '/^([\'\"])\s*https*:.*([\'\"])/si');
2473         array_push($bad_attvals{'/.*/'}{'/^src|background/i'}[1],
2474                 "\\1$secremoveimg\\1");
2475         array_push($bad_attvals{'/.*/'}{'/^style/i'}[0],
2476                 '/url\([\'\"]?https?:[^\)]*[\'\"]?\)/si');
2477         array_push($bad_attvals{'/.*/'}{'/^style/i'}[1],
2478                 "url(\\1$secremoveimg\\1)");
2479     }
2480
2481     $add_attr_to_tag = Array(
2482             "/^a$/i" =>
2483             Array('target'=>'"_blank"',
2484                 'title'=>'"'._("This external link will open in a new window").'"'
2485                 )
2486             );
2487     $trusted = sq_sanitize($body,
2488                            $tag_list,
2489                            $rm_tags_with_content,
2490                            $self_closing_tags,
2491                            $force_tag_closing,
2492                            $rm_attnames,
2493                            $bad_attvals,
2494                            $add_attr_to_tag,
2495                            $message,
2496                            $id,
2497                            $mailbox
2498                            );
2499     if (strpos($trusted,$secremoveimg)){
2500         $has_unsafe_images = true;
2501     }
2502
2503     // we want to parse mailto's in HTML output, change to SM compose links
2504     // this is a modified version of code from url_parser.php... but Marc is
2505     // right: we need a better filtering implementation; adding this randomly
2506     // here is not a great solution
2507     //
2508     if ($take_mailto_links) {
2509         // parseUrl($trusted);   // this even parses URLs inside of tags... too aggressive
2510         global $MailTo_PReg_Match;
2511         $MailTo_PReg_Match = '/mailto:' . substr($MailTo_PReg_Match, 1) ;
2512         if ((preg_match_all($MailTo_PReg_Match, $trusted, $regs)) && ($regs[0][0] != '')) {
2513             foreach ($regs[0] as $i => $mailto_before) {
2514                 $mailto_params = $regs[10][$i];
2515                 // get rid of any tailing quote since we have to add send_to to the end
2516                 //
2517                 if (substr($mailto_before, strlen($mailto_before) - 1) == '"')
2518                     $mailto_before = substr($mailto_before, 0, strlen($mailto_before) - 1);
2519                 if (substr($mailto_params, strlen($mailto_params) - 1) == '"')
2520                     $mailto_params = substr($mailto_params, 0, strlen($mailto_params) - 1);
2521
2522                 if ($regs[1][$i]) {    //if there is an email addr before '?', we need to merge it with the params
2523                     $to = 'to=' . $regs[1][$i];
2524                     if (strpos($mailto_params, 'to=') > -1)    //already a 'to='
2525                         $mailto_params = str_replace('to=', $to . '%2C%20', $mailto_params);
2526                     else {
2527                         if ($mailto_params)    //already some params, append to them
2528                             $mailto_params .= '&amp;' . $to;
2529                         else
2530                             $mailto_params .= '?' . $to;
2531                     }
2532                 }
2533
2534                 $url_str = preg_replace(array('/to=/i', '/(?<!b)cc=/i', '/bcc=/i'), array('send_to=', 'send_to_cc=', 'send_to_bcc='), $mailto_params);
2535
2536                 // we'll already have target=_blank, no need to allow comp_in_new
2537                 // here (which would be a lot more work anyway)
2538                 //
2539                 global $compose_new_win;
2540                 $temp_comp_in_new = $compose_new_win;
2541                 $compose_new_win = 0;
2542                 $comp_uri = makeComposeLink('src/compose.php' . $url_str, $mailto_before);
2543                 $compose_new_win = $temp_comp_in_new;
2544
2545                 // remove <a href=" and anything after the next quote (we only
2546                 // need the uri, not the link HTML) in compose uri
2547                 //
2548                 $comp_uri = substr($comp_uri, 9);
2549                 $comp_uri = substr($comp_uri, 0, strpos($comp_uri, '"', 1));
2550                 $trusted = str_replace($mailto_before, $comp_uri, $trusted);
2551             }
2552         }
2553     }
2554
2555     return $trusted;
2556 }
2557
2558 /**
2559  * function SendDownloadHeaders - send file to the browser
2560  *
2561  * Original Source: SM core src/download.php
2562  * moved here to make it available to other code, and separate
2563  * front end from back end functionality.
2564  *
2565  * @param string $type0 first half of mime type
2566  * @param string $type1 second half of mime type
2567  * @param string $filename filename to tell the browser for downloaded file
2568  * @param boolean $force whether to force the download dialog to pop
2569  * @param optional integer $filesize send the Content-Header and length to the browser
2570  * @return void
2571  */
2572 function SendDownloadHeaders($type0, $type1, $filename, $force, $filesize=0) {
2573     global $languages, $squirrelmail_language;
2574     $isIE = $isIE6plus = false;
2575
2576     sqgetGlobalVar('HTTP_USER_AGENT', $HTTP_USER_AGENT, SQ_SERVER);
2577
2578     if (strstr($HTTP_USER_AGENT, 'compatible; MSIE ') !== false &&
2579             strstr($HTTP_USER_AGENT, 'Opera') === false) {
2580         $isIE = true;
2581     }
2582
2583     if (preg_match('/compatible; MSIE ([0-9]+)/', $HTTP_USER_AGENT, $match) &&
2584         ((int)$match[1]) >= 6 && strstr($HTTP_USER_AGENT, 'Opera') === false) {
2585         $isIE6plus = true;
2586     }
2587
2588     if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
2589             function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_downloadfilename')) {
2590         $filename =
2591             call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_downloadfilename', $filename, $HTTP_USER_AGENT);
2592     } else {
2593         $filename = ereg_replace('[\\/:\*\?"<>\|;]', '_', str_replace('&nbsp;', ' ', $filename));
2594     }
2595
2596     // A Pox on Microsoft and it's Internet Explorer!
2597     //
2598     // IE has lots of bugs with file downloads.
2599     // It also has problems with SSL.  Both of these cause problems
2600     // for us in this function.
2601     //
2602     // See this article on Cache Control headers and SSL
2603     // http://support.microsoft.com/default.aspx?scid=kb;en-us;323308
2604     //
2605     // The best thing you can do for IE is to upgrade to the latest
2606     // version
2607     //set all the Cache Control Headers for IE
2608     if ($isIE) {
2609         $filename=rawurlencode($filename);
2610         header ("Pragma: public");
2611         header ("Cache-Control: no-store, max-age=0, no-cache, must-revalidate"); // HTTP/1.1
2612         header ("Cache-Control: post-check=0, pre-check=0", false);
2613         header ("Cache-Control: private");
2614
2615         //set the inline header for IE, we'll add the attachment header later if we need it
2616         header ("Content-Disposition: inline; filename=$filename");
2617     }
2618
2619     if (!$force) {
2620         // Try to show in browser window
2621         header ("Content-Disposition: inline; filename=\"$filename\"");
2622         header ("Content-Type: $type0/$type1; name=\"$filename\"");
2623     } else {
2624         // Try to pop up the "save as" box
2625
2626         // IE makes this hard.  It pops up 2 save boxes, or none.
2627         // http://support.microsoft.com/support/kb/articles/Q238/5/88.ASP
2628         // http://support.microsoft.com/default.aspx?scid=kb;EN-US;260519
2629         // But, according to Microsoft, it is "RFC compliant but doesn't
2630         // take into account some deviations that allowed within the
2631         // specification."  Doesn't that mean RFC non-compliant?
2632         // http://support.microsoft.com/support/kb/articles/Q258/4/52.ASP
2633
2634         // all browsers need the application/octet-stream header for this
2635         header ("Content-Type: application/octet-stream; name=\"$filename\"");
2636
2637         // http://support.microsoft.com/support/kb/articles/Q182/3/15.asp
2638         // Do not have quotes around filename, but that applied to
2639         // "attachment"... does it apply to inline too?
2640         header ("Content-Disposition: attachment; filename=\"$filename\"");
2641
2642         if ($isIE && !$isIE6plus) {
2643             // This combination seems to work mostly.  IE 5.5 SP 1 has
2644             // known issues (see the Microsoft Knowledge Base)
2645
2646             // This works for most types, but doesn't work with Word files
2647             header ("Content-Type: application/download; name=\"$filename\"");
2648             header ("Content-Type: application/force-download; name=\"$filename\"");
2649             // These are spares, just in case.  :-)
2650             //header("Content-Type: $type0/$type1; name=\"$filename\"");
2651             //header("Content-Type: application/x-msdownload; name=\"$filename\"");
2652             //header("Content-Type: application/octet-stream; name=\"$filename\"");
2653         } else if ($isIE) {
2654              // This is to prevent IE for MIME sniffing and auto open a file in IE
2655              header ("Content-Type: application/force-download; name=\"$filename\"");
2656         } else {
2657             // another application/octet-stream forces download for Netscape
2658             header ("Content-Type: application/octet-stream; name=\"$filename\"");
2659         }
2660     }
2661
2662     //send the content-length header if the calling function provides it
2663     if ($filesize > 0) {
2664         header("Content-Length: $filesize");
2665     }
2666
2667 }  // end fn SendDownloadHeaders