functions/mime.php

   1 <?php
   2
   3 /**
   4  * mime.php
   5  *
   6  * Copyright (c) 1999-2002 The SquirrelMail Project Team
   7  * Licensed under the GNU GPL. For full terms see the file COPYING.
   8  *
   9  * This contains the functions necessary to detect and decode MIME
  10  * messages.
  11  *
  12  * $Id$
  13  */
  14
  15 require_once('../functions/imap.php');
  16 require_once('../functions/attachment_common.php');
  17
  18 /** Setting up the objects that have the structure for the message **/
  19 class msg_header {
  20     /** msg_header contains generic variables for values that **/
  21     /** could be in a header.                                 **/
  22
  23     var $type0 = '', $type1 = '', $boundary = '', $charset = '',
  24         $encoding = '', $size = 0, $to = array(), $from = '', $date = '',
  25         $cc = array(), $bcc = array(), $reply_to = '', $subject = '',
  26         $id = 0, $mailbox = '', $description = '', $filename = '',
  27         $entity_id = 0, $message_id = 0, $name = '', $priority = 3, $type = '';
  28 }
  29
  30 class message {
  31     /** message is the object that contains messages.  It is a recursive
  32       object in that through the $entities variable, it can contain
  33       more objects of type message.  See documentation in mime.txt for
  34       a better description of how this works.
  35     **/
  36     var $header = '', $entities = array();
  37
  38     function addEntity ($msg) {
  39         $this->entities[] = $msg;
  40     }
  41 }
  42
  43 /* --------------------------------------------------------------------------------- */
  44 /* MIME DECODING                                                                     */
  45 /* --------------------------------------------------------------------------------- */
  46
  47 /* This function gets the structure of a message and stores it in the "message" class.
  48  * It will return this object for use with all relevant header information and
  49  * fully parsed into the standard "message" object format.
  50  */
  51 function mime_structure ($imap_stream, $header) {
  52
  53     $ssid = sqimap_session_id();
  54     $lsid = strlen( $ssid );
  55     $id = $header->id;
  56     fputs ($imap_stream, "$ssid FETCH $id BODYSTRUCTURE\r\n");
  57     //
  58     // This should use sqimap_read_data instead of reading it itself
  59     //
  60     $read = fgets ($imap_stream, 9216);
  61     $bodystructure = '';
  62     while ( substr($read, 0, $lsid) <> $ssid &&
  63          !feof( $imap_stream ) ) {
  64         $bodystructure .= $read;
  65         $read = fgets ($imap_stream, 9216);
  66     }
  67     $read = $bodystructure;
  68
  69     // isolate the body structure and remove beginning and end parenthesis
  70     $read = trim(substr ($read, strpos(strtolower($read), 'bodystructure') + 13));
  71
  72     $read = trim(substr ($read, 0, -1));
  73     $end = mime_match_parenthesis(0, $read);
  74     while ($end == strlen($read)-1) {
  75         $read = trim(substr ($read, 0, -1));
  76         $read = trim(substr ($read, 1));
  77         $end = mime_match_parenthesis(0, $read);
  78     }
  79
  80     $msg = mime_parse_structure ($read, 0);
  81     $msg->header = $header;
  82
  83     return( $msg );
  84 }
  85
  86 /* this starts the parsing of a particular structure.  It is called recursively,
  87  * so it can be passed different structures.  It returns an object of type
  88  * $message.
  89  * First, it checks to see if it is a multipart message.  If it is, then it
  90  * handles that as it sees is necessary.  If it is just a regular entity,
  91  * then it parses it and adds the necessary header information (by calling out
  92  * to mime_get_elements()
  93  */
  94 function mime_parse_structure ($structure, $ent_id) {
  95   $properties = array();
  96   $msg = new message();
  97   if ($structure{0} == '(') {
  98      $old_ent_id = $ent_id;
  99      $ent_id = mime_new_element_level($ent_id);
 100      $start = $end = -1;
 101      do {
 102         $start = $end+1;
 103         $end = mime_match_parenthesis ($start, $structure);
 104         /* add "forgotten"  parent entities (alternative and relative) */
 105         if (strpos($ent_id, '0')  || strpos($ent_id, '0') == 0) {
 106             $str = substr($structure, $end+1 );
 107             $startprop = strrpos($str,'(');
 108             $endprop   = strrpos($str,')');
 109             $propstr = substr($str, $startprop + 1, ($endprop - $startprop)-1);
 110
 111             $type1 = trim(substr($str,0, $startprop));
 112             $pos = strrpos($type1,' ');
 113             $type1 = strtolower(trim(substr($type1,$pos +1)));
 114             $cnt = strlen($type1);
 115             $type1 = substr($type1,0,$cnt-1);
 116
 117             $properties = mime_get_props($properties, $propstr);
 118             if (count($properties)>0) {
 119                 $msg->header->entity_id = $old_ent_id;
 120                 $msg->header->type0 = 'multipart';
 121                 $msg->header->type1 = $type1;
 122             }
 123             for ($i=0; $i < count($properties); $i++) {
 124                 $msg->header->{$properties[$i]['name']} = $properties[$i]['value'];
 125                 $name = $properties[$i]['name'];
 126                 $value = $properties[$i]['value'];
 127             }
 128         }
 129
 130         $element = substr($structure, $start+1, ($end - $start)-1);
 131
 132         $ent_id = mime_increment_id ($ent_id);
 133         $newmsg = mime_parse_structure ($element, $ent_id);
 134         $msg->addEntity ($newmsg);
 135
 136      } while ($structure{$end+1} == '(');
 137   } else {
 138      // parse the elements
 139     $msg = mime_get_element ($structure, $msg, $ent_id);
 140   }
 141   return $msg;
 142 }
 143
 144 /* Increments the element ID.  An element id can look like any of
 145  * the following:  1, 1.2, 4.3.2.4.1, etc.  This function increments
 146  * the last number of the element id, changing 1.2 to 1.3.
 147  */
 148 function mime_increment_id ($id) {
 149
 150     if (strpos($id, '.')) {
 151         $first = substr($id, 0, strrpos($id, '.'));
 152         $last = substr($id, strrpos($id, '.')+1);
 153         $last++;
 154         $new = $first . '.' .$last;
 155     } else {
 156         $new = $id + 1;
 157     }
 158
 159     return $new;
 160 }
 161
 162 /*
 163  * See comment for mime_increment_id().
 164  * This adds another level on to the entity_id changing 1.3 to 1.3.0
 165  * NOTE:  1.3.0 is not a valid element ID.  It MUST be incremented
 166  *        before it can be used.  I left it this way so as not to have
 167  *        to make a special case if it is the first entity_id.  It
 168  *        always increments it, and that works fine.
 169  */
 170 function mime_new_element_level ($id) {
 171
 172     if (!$id) {
 173         $id = 0;
 174     } else {
 175         $id = $id . '.0';
 176     }
 177
 178     return( $id );
 179 }
 180
 181 function mime_get_element (&$structure, $msg, $ent_id) {
 182
 183   $elem_num = 1;
 184   $msg->header = new msg_header();
 185   $msg->header->entity_id = $ent_id;
 186   $properties = array();
 187   while (strlen($structure) > 0) {
 188      $structure = trim($structure);
 189      $char = $structure{0};
 190
 191      if (strtolower(substr($structure, 0, 3)) == 'nil') {
 192         $text = '';
 193         $structure = substr($structure, 3);
 194      } else if ($char == '"') {
 195         // loop through until we find the matching quote, and return that as a string
 196         $pos = 1;
 197         $text = '';
 198         while ( ($char = $structure{$pos} ) <> '"' && $pos < strlen($structure)) {
 199            $text .= $char;
 200            $pos++;
 201         }
 202         $structure = substr($structure, strlen($text) + 2);
 203      } else if ($char == '(') {
 204         // comment me
 205         $end = mime_match_parenthesis (0, $structure);
 206         $sub = substr($structure, 1, $end-1);
 207         $properties = mime_get_props($properties, $sub);
 208         $structure = substr($structure, strlen($sub) + 2);
 209      } else {
 210         // loop through until we find a space or an end parenthesis
 211         $pos = 0;
 212         $char = $structure{$pos};
 213         $text = '';
 214         while ($char != ' ' && $char != ')' && $pos < strlen($structure)) {
 215            $text .= $char;
 216            $pos++;
 217            $char = $structure{$pos};
 218         }
 219         $structure = substr($structure, strlen($text));
 220      }
 221
 222      // This is where all the text parts get put into the header
 223      switch ($elem_num) {
 224         case 1:
 225            $msg->header->type0 = strtolower($text);
 226            break;
 227         case 2:
 228            $msg->header->type1 = strtolower($text);
 229            break;
 230         case 4: // Id
 231            // Invisimail enclose images with <>
 232            $msg->header->id = str_replace( '<', '', str_replace( '>', '', $text ) );
 233            break;
 234         case 5:
 235            $msg->header->description = $text;
 236            break;
 237         case 6:
 238            $msg->header->encoding = strtolower($text);
 239            break;
 240         case 7:
 241            $msg->header->size = $text;
 242            break;
 243         default:
 244            if ($msg->header->type0 == 'text' && $elem_num == 8) {
 245               // This is a plain text message, so lets get the number of lines
 246               // that it contains.
 247               $msg->header->num_lines = $text;
 248
 249            } else if ($msg->header->type0 == 'message' && $msg->header->type1 == 'rfc822' && $elem_num == 8) {
 250               // This is an encapsulated message, so lets start all over again and
 251               // parse this message adding it on to the existing one.
 252               $structure = trim($structure);
 253               if ( $structure{0} == '(' ) {
 254                  $e = mime_match_parenthesis (0, $structure);
 255                  $structure = substr($structure, 0, $e);
 256                  $structure = substr($structure, 1);
 257                  $m = mime_parse_structure($structure, $msg->header->entity_id);
 258
 259                  // the following conditional is there to correct a bug that wasn't
 260                  // incrementing the entity IDs correctly because of the special case
 261                  // that message/rfc822 is.  This fixes it fine.
 262                  if (substr($structure, 1, 1) != '(')
 263                     $m->header->entity_id = mime_increment_id(mime_new_element_level($ent_id));
 264
 265                  // Now we'll go through and reformat the results.
 266                  if ($m->entities) {
 267                     for ($i=0; $i < count($m->entities); $i++) {
 268                        $msg->addEntity($m->entities[$i]);
 269                     }
 270                  } else {
 271                     $msg->addEntity($m);
 272                  }
 273                  $structure = "";
 274               }
 275            }
 276            break;
 277      }
 278      $elem_num++;
 279      $text = "";
 280   }
 281   // loop through the additional properties and put those in the various headers
 282   for ($i=0; $i < count($properties); $i++) {
 283      $msg->header->{$properties[$i]['name']} = $properties[$i]['value'];
 284   }
 285
 286   return $msg;
 287 }
 288
 289 /*
 290  * I did most of the MIME stuff yesterday (June 20, 2000), but I couldn't
 291  * figure out how to do this part, so I decided to go to bed.  I woke up
 292  * in the morning and had a flash of insight.  I went to the white-board
 293  * and scribbled it out, then spent a bit programming it, and this is the
 294  * result.  Nothing complicated, but I think my brain was fried yesterday.
 295  * Funny how that happens some times.
 296  *
 297  * This gets properties in a nested parenthesisized list.  For example,
 298  * this would get passed something like:  ("attachment" ("filename" "luke.tar.gz"))
 299  * This returns an array called $props with all paired up properties.
 300  * It ignores the "attachment" for now, maybe that should change later
 301  * down the road.  In this case, what is returned is:
 302  *    $props[0]["name"] = "filename";
 303  *    $props[0]["value"] = "luke.tar.gz";
 304  */
 305 function mime_get_props ($props, $structure) {
 306
 307   while (strlen($structure) > 0) {
 308      $structure = trim($structure);
 309      $char = $structure{0};
 310      if ($char == '"') {
 311         $pos = 1;
 312         $tmp = '';
 313         while ( ( $char = $structure{$pos} ) != '"' &&
 314                 $pos < strlen($structure)) {
 315            $tmp .= $char;
 316            $pos++;
 317         }
 318         $structure = trim(substr($structure, strlen($tmp) + 2));
 319         $char = $structure{0};
 320
 321         if ($char == '"') {
 322            $pos = 1;
 323            $value = '';
 324            while ( ( $char = $structure{$pos} ) != '"' &&
 325                    $pos < strlen($structure) ) {
 326               $value .= $char;
 327               $pos++;
 328            }
 329            $structure = trim(substr($structure, strlen($value) + 2));
 330            $k = count($props);
 331            $props[$k]['name'] = strtolower($tmp);
 332            $props[$k]['value'] = $value;
 333            if ($structure != '') {
 334                 mime_get_props($props, $structure);
 335            } else {
 336              return $props;
 337            }
 338         } else if ($char == '(') {
 339            $end = mime_match_parenthesis (0, $structure);
 340            $sub = substr($structure, 1, $end-1);
 341            if (! isset($props))
 342               $props = array();
 343               $props = mime_get_props($props, $sub);
 344               $structure = substr($structure, strlen($sub) + 2);
 345            return $props;
 346         }
 347      } else if ($char == '(') {
 348         $end = mime_match_parenthesis (0, $structure);
 349         $sub = substr($structure, 1, $end-1);
 350         $props = mime_get_props($props, $sub);
 351         $structure = substr($structure, strlen($sub) + 2);
 352         return $props;
 353      } else {
 354         return $props;
 355      }
 356   }
 357 }
 358
 359 /*
 360  *  Matches parenthesis.  It will return the position of the matching
 361  *  parenthesis in $structure.  For instance, if $structure was:
 362  *     ("text" "plain" ("val1name", "1") nil ... )
 363  *     x                                         x
 364  *  then this would return 42 to match up those two.
 365  */
 366 function mime_match_parenthesis ($pos, $structure) {
 367
 368     $j = strlen( $structure );
 369
 370     // ignore all extra characters
 371     // If inside of a string, skip string -- Boundary IDs and other
 372     // things can have ) in them.
 373     if ( $structure{$pos} != '(' ) {
 374         return( $j );
 375     }
 376
 377     while ( $pos < $j ) {
 378         $pos++;
 379         if ($structure{$pos} == ')') {
 380             return $pos;
 381         } elseif ($structure{$pos} == '"') {
 382             $pos++;
 383             while ( $structure{$pos} != '"' &&
 384                     $pos < $j ) {
 385                if (substr($structure, $pos, 2) == '\\"') {
 386                   $pos++;
 387                } elseif (substr($structure, $pos, 2) == '\\\\') {
 388                   $pos++;
 389                }
 390                $pos++;
 391             }
 392         } elseif ( $structure{$pos} == '(' ) {
 393             $pos = mime_match_parenthesis ($pos, $structure);
 394         }
 395     }
 396     echo _("Error decoding mime structure.  Report this as a bug!") . '<br>';
 397     return( $pos );
 398 }
 399
 400 function mime_fetch_body($imap_stream, $id, $ent_id ) {
 401
 402     /*
 403      * do a bit of error correction.  If we couldn't find the entity id, just guess
 404      * that it is the first one.  That is usually the case anyway.
 405      */
 406     if (!$ent_id) {
 407         $ent_id = 1;
 408     }
 409
 410     $cmd = "FETCH $id BODY[$ent_id]";
 411     $data = sqimap_run_command ($imap_stream, $cmd, true, $response, $message);
 412
 413     do {
 414         $topline = trim(array_shift( $data ));
 415     } while( $topline && $topline[0] == '*' && !preg_match( '/\* [0-9]+ FETCH.*/i', $topline )) ;
 416     $wholemessage = implode('', $data);
 417     if (ereg('\\{([^\\}]*)\\}', $topline, $regs)) {
 418
 419         $ret = substr( $wholemessage, 0, $regs[1] );
 420         /*
 421             There is some information in the content info header that could be important
 422             in order to parse html messages. Let's get them here.
 423         */
 424         if ( $ret{0} == '<' ) {
 425             $data = sqimap_run_command ($imap_stream, "FETCH $id BODY[$ent_id.MIME]", true, $response, $message);
 426             /* BASE within HTML documents is illegal (see w3 spec)
 427 *            $base = '';
 428 *            $k = 10;
 429 *            foreach( $data as $d ) {
 430 *                if ( substr( $d, 0, 13 ) == 'Content-Base:' ) {
 431 *                    $j = strlen( $d );
 432 *                    $i = 13;
 433 *                    $base = '';
 434 *                    while ( $i < $j &&
 435 *                           ( !isNoSep( $d{$i} ) || $d{$i} == '"' )  )
 436 *                        $i++;
 437 *                    while ( $i < $j ) {
 438 *                        if ( isNoSep( $d{$i} ) )
 439 *                            $base .= $d{$i};
 440 *                        $i++;
 441 *                    }
 442 *                    $k = 0;
 443 *                } elseif ( $k == 1 && !isnosep( $d{0} ) ) {
 444 *                    $base .= substr( $d, 1 );
 445 *                }
 446 *                $k++;
 447 *            }
 448 *            if ( $base <> '' ) {
 449 *                $ret = "<base href=\"$base\">" . $ret;
 450 *            }
 451 *           */
 452         }
 453     } else if (ereg('"([^"]*)"', $topline, $regs)) {
 454         $ret = $regs[1];
 455     } else {
 456         global $where, $what, $mailbox, $passed_id, $startMessage;
 457         $par = 'mailbox=' . urlencode($mailbox) . "&amp;passed_id=$passed_id";
 458         if (isset($where) && isset($what)) {
 459             $par .= '&amp;where='. urlencode($where) . "&amp;what=" . urlencode($what);
 460         } else {
 461             $par .= "&amp;startMessage=$startMessage&amp;show_more=0";
 462         }
 463         $par .= '&amp;response=' . urlencode($response) .
 464                 '&amp;message=' . urlencode($message).
 465                 '&amp;topline=' . urlencode($topline);
 466
 467         echo   '<tt><br>' .
 468                '<table width="80%"><tr>' .
 469                '<tr><td colspan=2>' .
 470                _("Body retrieval error. The reason for this is most probably that the message is malformed. Please help us making future versions better by submitting this message to the developers knowledgebase!") .
 471                " <A HREF=\"../src/retrievalerror.php?$par\"><br>" .
 472                _("Submit message") . '</A><BR>&nbsp;' .
 473                '</td></tr>' .
 474                '<td><b>' . _("Command:") . "</td><td>$cmd</td></tr>" .
 475                '<td><b>' . _("Response:") . "</td><td>$response</td></tr>" .
 476                '<td><b>' . _("Message:") . "</td><td>$message</td></tr>" .
 477                '<td><b>' . _("FETCH line:") . "</td><td>$topline</td></tr>" .
 478                "</table><BR></tt></font><hr>";
 479
 480         $data = sqimap_run_command ($imap_stream, "FETCH $passed_id BODY[]", true, $response, $message);
 481         array_shift($data);
 482         $wholemessage = implode('', $data);
 483
 484         $ret = $wholemessage;
 485     }
 486     return( $ret );
 487 }
 488
 489 function mime_print_body_lines ($imap_stream, $id, $ent_id, $encoding) {
 490     // do a bit of error correction.  If we couldn't find the entity id, just guess
 491     // that it is the first one.  That is usually the case anyway.
 492     if (!$ent_id) {
 493         $ent_id = 1;
 494     }
 495     $sid = sqimap_session_id();
 496     // Don't kill the connection if the browser is over a dialup
 497     // and it would take over 30 seconds to download it.
 498
 499     // don´t call set_time_limit in safe mode.
 500     if (!ini_get("safe_mode")) {
 501         set_time_limit(0);
 502     }
 503
 504     fputs ($imap_stream, "$sid FETCH $id BODY[$ent_id]\r\n");
 505     $cnt = 0;
 506     $continue = true;
 507     $read = fgets ($imap_stream,4096);
 508     // This could be bad -- if the section has sqimap_session_id() . ' OK'
 509     // or similar, it will kill the download.
 510     while (!ereg("^".$sid." (OK|BAD|NO)(.*)$", $read, $regs)) {
 511       if (trim($read) == ')==') {
 512           $read1 = $read;
 513           $read = fgets ($imap_stream,4096);
 514           if (ereg("^".$sid." (OK|BAD|NO)(.*)$", $read, $regs)) {
 515               return;
 516           } else {
 517               echo decodeBody($read1, $encoding) .
 518                    decodeBody($read, $encoding);
 519           }
 520       } else if ($cnt) {
 521           echo decodeBody($read, $encoding);
 522       }
 523       $read = fgets ($imap_stream,4096);
 524       $cnt++;
 525     }
 526 }
 527
 528 /* -[ END MIME DECODING ]----------------------------------------------------------- */
 529
 530
 531
 532 /* This is the first function called.  It decides if this is a multipart
 533    message or if it should be handled as a single entity
 534  */
 535 function decodeMime ($imap_stream, &$header) {
 536     global $username, $key, $imapServerAddress, $imapPort;
 537     return mime_structure ($imap_stream, $header);
 538 }
 539
 540 // This is here for debugging purposese.  It will print out a list
 541 // of all the entity IDs that are in the $message object.
 542
 543 function listEntities ($message) {
 544 if ($message) {
 545  if ($message->header->entity_id)
 546  echo "<tt>" . $message->header->entity_id . ' : ' . $message->header->type0 . '/' . $message->header->type1 . '<br>';
 547  for ($i = 0; $message->entities[$i]; $i++) {
 548     $msg = listEntities($message->entities[$i], $ent_id);
 549     if ($msg)
 550        return $msg;
 551  }
 552 }
 553 }
 554
 555
 556 /* returns a $message object for a particular entity id */
 557 function getEntity ($message, $ent_id) {
 558     if ($message) {
 559         if ($message->header->entity_id == $ent_id && strlen($ent_id) == strlen($message->header->entity_id))
 560         {
 561             return $message;
 562         } else {
 563             for ($i = 0; isset($message->entities[$i]); $i++) {
 564                 $msg = getEntity ($message->entities[$i], $ent_id);
 565                 if ($msg) {
 566                     return $msg;
 567                 }
 568             }
 569         }
 570     }
 571 }
 572
 573 /*
 574  * figures out what entity to display and returns the $message object
 575  * for that entity.
 576  */
 577 function findDisplayEntity ($msg, $textOnly = 1)   {
 578     global $show_html_default;
 579
 580     $entity = 0;
 581
 582     if ($msg) {
 583         if ( $msg->header->type0 == 'multipart' &&
 584              ( $msg->header->type1 == 'alternative' ||
 585                $msg->header->type1 == 'mixed' ||
 586                $msg->header->type1 == 'related' ) &&
 587              $show_html_default && ! $textOnly ) {
 588             $entity = findDisplayEntityHTML($msg);
 589         }
 590
 591         // Show text/plain or text/html -- the first one we find.
 592         if ( $entity == 0 &&
 593              $msg->header->type0 == 'text' &&
 594              ( $msg->header->type1 == 'plain' ||
 595                $msg->header->type1 == 'html' ) &&
 596              isset($msg->header->entity_id) ) {
 597             $entity = $msg->header->entity_id;
 598         }
 599
 600         $i = 0;
 601         while ($entity == 0 && isset($msg->entities[$i]) ) {
 602             $entity = findDisplayEntity($msg->entities[$i], $textOnly);
 603             $i++;
 604         }
 605     }
 606
 607     return( $entity );
 608 }
 609
 610 /* Shows the HTML version */
 611 function findDisplayEntityHTML ($message) {
 612
 613     if ( $message->header->type0 == 'text' &&
 614          $message->header->type1 == 'html' &&
 615          isset($message->header->entity_id)) {
 616         return $message->header->entity_id;
 617     }
 618     for ($i = 0; isset($message->entities[$i]); $i ++) {
 619         if ( $message->header->type0 == 'message' &&
 620             $message->header->type1 == 'rfc822' &&
 621             isset($message->header->entity_id)) {
 622             return 0;
 623         }
 624         $entity = findDisplayEntityHTML($message->entities[$i]);
 625         if ($entity != 0) {
 626             return $entity;
 627         }
 628     }
 629
 630     return 0;
 631 }
 632
 633 /*
 634  * translateText
 635  * Extracted from strings.php 23/03/2002
 636  */
 637
 638 function translateText(&$body, $wrap_at, $charset) {
 639     global $where, $what; /* from searching */
 640     global $color; /* color theme */
 641
 642     require_once('../functions/url_parser.php');
 643
 644     $body_ary = explode("\n", $body);
 645     $PriorQuotes = 0;
 646     for ($i=0; $i < count($body_ary); $i++) {
 647         $line = $body_ary[$i];
 648         if (strlen($line) - 2 >= $wrap_at) {
 649             sqWordWrap($line, $wrap_at);
 650         }
 651         $line = charset_decode($charset, $line);
 652         $line = str_replace("\t", '        ', $line);
 653
 654         parseUrl ($line);
 655
 656         $Quotes = 0;
 657         $pos = 0;
 658         $j = strlen( $line );
 659
 660         while ( $pos < $j ) {
 661             if ($line[$pos] == ' ') {
 662                 $pos ++;
 663             } else if (strpos($line, '&gt;', $pos) === $pos) {
 664                 $pos += 4;
 665                 $Quotes ++;
 666             } else {
 667                 break;
 668             }
 669         }
 670
 671         if ($Quotes > 1) {
 672             if (! isset($color[14])) {
 673                 $color[14] = '#FF0000';
 674             }
 675             $line = '<FONT COLOR="' . $color[14] . '">' . $line . '</FONT>';
 676         } elseif ($Quotes) {
 677             if (! isset($color[13])) {
 678                 $color[13] = '#800000';
 679             }
 680             $line = '<FONT COLOR="' . $color[13] . '">' . $line . '</FONT>';
 681         }
 682
 683         $body_ary[$i] = $line;
 684     }
 685     $body = '<pre>' . implode("\n", $body_ary) . '</pre>';
 686 }
 687
 688 /* debugfunction for looping through entities and displaying correct entities */
 689 function listMyEntities ($message) {
 690
 691 if ($message) {
 692     if ($message->header->entity_id) {
 693         echo "<tt>" . $message->header->entity_id . ' : ' . $message->header->type0 . '/' . $message->header->type1 . '<br>';
 694     }
 695     if (!($message->header->type0 == 'message' &&  $message->header->type1 == 'rfc822')) {
 696         if (isset($message->header->boundary) ) {
 697             $ent_id = $message->header->entity_id;
 698             $var = $message->header->boundary;
 699             if ($var !='')
 700             echo "<b>$ent_id boundary = $var</b><br>";
 701         }
 702         if (isset($message->header->type) ) {
 703             $var = $message->header->type;
 704             if ($var !='')
 705             echo "<b>$ent_id type = $var</b><br>";
 706         }
 707         for ($i = 0; $message->entities[$i]; $i++) {
 708             $msg = listMyEntities($message->entities[$i]);
 709         }
 710
 711         if ($msg )  return $msg;
 712     }
 713 }
 714
 715 }
 716
 717
 718
 719 /* This returns a parsed string called $body. That string can then
 720 be displayed as the actual message in the HTML. It contains
 721 everything needed, including HTML Tags, Attachments at the
 722 bottom, etc.
 723 */
 724 function formatBody($imap_stream, $message, $color, $wrap_at) {
 725     // this if statement checks for the entity to show as the
 726     // primary message. To add more of them, just put them in the
 727     // order that is their priority.
 728     global $startMessage, $username, $key, $imapServerAddress, $imapPort, $body,
 729            $show_html_default, $has_unsafe_images, $view_unsafe_images, $sort;
 730
 731     $has_unsafe_images = 0;
 732
 733     $id = $message->header->id;
 734
 735     $urlmailbox = urlencode($message->header->mailbox);
 736 //    ListMyEntities($message);
 737     // Get the right entity and redefine message to be this entity
 738     // Pass the 0 to mean that we want the 'best' viewable one
 739     $ent_num = findDisplayEntity ($message, 0);
 740     $body_message = getEntity($message, $ent_num);
 741     if (($body_message->header->type0 == 'text') ||
 742         ($body_message->header->type0 == 'rfc822')) {
 743         $body = mime_fetch_body ($imap_stream, $id, $ent_num);
 744         $body = decodeBody($body, $body_message->header->encoding);
 745         $hookResults = do_hook("message_body", $body);
 746         $body = $hookResults[1];
 747         // If there are other types that shouldn't be formatted, add
 748         // them here
 749         if ($body_message->header->type1 == 'html') {
 750             if ( $show_html_default <> 1 ) {
 751                 $body = strip_tags( $body );
 752                 translateText($body, $wrap_at, $body_message->header->charset);
 753             } else {
 754                 $body = MagicHTML( $body, $id );
 755             }
 756         } else {
 757             translateText($body, $wrap_at, $body_message->header->charset);
 758         }
 759
 760         $body .= "<CENTER><SMALL><A HREF=\"../src/download.php?absolute_dl=true&amp;passed_id=$id&amp;passed_ent_id=$ent_num&amp;mailbox=$urlmailbox&amp;showHeaders=1\">". _("Download this as a file") ."</A></SMALL></CENTER><BR>";
 761         if ($has_unsafe_images) {
 762             if ($view_unsafe_images) {
 763                 $body .= "<CENTER><SMALL><A HREF=\"read_body.php?passed_id=$id&amp;mailbox=$urlmailbox&amp;sort=$sort&amp;startMessage=$startMessage&amp;show_more=0\">". _("Hide Unsafe Images") ."</A></SMALL></CENTER><BR>\n";
 764             } else {
 765                 $body .= "<CENTER><SMALL><A HREF=\"read_body.php?passed_id=$id&amp;mailbox=$urlmailbox&amp;sort=$sort&amp;startMessage=$startMessage&amp;show_more=0&amp;view_unsafe_images=1\">". _("View Unsafe Images") ."</A></SMALL></CENTER><BR>\n";
 766             }
 767         }
 768
 769         /** Display the ATTACHMENTS: message if there's more than one part **/
 770         if (isset($message->entities[0])) {
 771             $body .= formatAttachments ($message, $ent_num, $message->header->mailbox, $id);
 772         }
 773     } else {
 774         $body = formatAttachments ($message, -1, $message->header->mailbox, $id);
 775     }
 776     return ($body);
 777 }
 778
 779 /*
 780  * A recursive function that returns a list of attachments with links
 781  * to where to download these attachments
 782  */
 783 function formatAttachments($message, $ent_id, $mailbox, $id) {
 784     global $where, $what;
 785     global $startMessage, $color;
 786     static $ShownHTML = 0;
 787
 788     $body = '';
 789     if ($ShownHTML == 0) {
 790
 791         $ShownHTML = 1;
 792         $body .= "<TABLE WIDTH=\"100%\" CELLSPACING=0 CELLPADDING=2 BORDER=0 BGCOLOR=\"$color[0]\"><TR>\n" .
 793                 "<TH ALIGN=\"left\" BGCOLOR=\"$color[9]\"><B>\n" .
 794                 _("Attachments") . ':' .
 795                 "</B></TH></TR><TR><TD>\n" .
 796                 "<TABLE CELLSPACING=0 CELLPADDING=1 BORDER=0>\n" .
 797                 formatAttachments($message, $ent_id, $mailbox, $id) .
 798                 "</TABLE></TD></TR></TABLE>";
 799
 800     } else if ($message) {
 801         $header = $message->header;
 802         $type0 = strtolower($header->type0);
 803         $type1 = strtolower($header->type1);
 804         $name = '';
 805         if (isset($header->name)) {
 806             $name = decodeHeader($header->name);
 807         }
 808         if ($type0 =='message' && $type1 == 'rfc822') {
 809
 810             $filename = decodeHeader($message->header->filename);
 811             if (trim($filename) == '') {
 812                 if (trim($name) == '') {
 813                     $display_filename = 'untitled-[' . $message->header->entity_id . ']' ;
 814                 } else {
 815                     $display_filename = $name;
 816                     $filename = $name;
 817                 }
 818             } else {
 819                 $display_filename = $filename;
 820             }
 821
 822             $urlMailbox = urlencode($mailbox);
 823             $ent = urlencode($message->header->entity_id);
 824
 825             $DefaultLink =
 826                 "../src/download.php?startMessage=$startMessage&amp;passed_id=$id&amp;mailbox=$urlMailbox&amp;passed_ent_id=$ent";
 827             if ($where && $what) {
 828                 $DefaultLink .= '&amp;where=' . urlencode($where) . '&amp;what=' . urlencode($what);
 829             }
 830             $Links['download link']['text'] = _("download");
 831             $Links['download link']['href'] =
 832                 "../src/download.php?absolute_dl=true&amp;passed_id=$id&amp;mailbox=$urlMailbox&amp;passed_ent_id=$ent";
 833             $ImageURL = '';
 834
 835             /* this executes the attachment hook with a specific MIME-type.
 836                 * if that doens't have results, it tries if there's a rule
 837                 * for a more generic type. */
 838             $HookResults = do_hook("attachment $type0/$type1", $Links,
 839                 $startMessage, $id, $urlMailbox, $ent, $DefaultLink, $display_filename, $where, $what);
 840             if(count($HookResults[1]) <= 1) {
 841                 $HookResults = do_hook("attachment $type0/*", $Links,
 842                 $startMessage, $id, $urlMailbox, $ent, $DefaultLink,
 843                 $display_filename, $where, $what);
 844             }
 845
 846             $Links = $HookResults[1];
 847             $DefaultLink = $HookResults[6];
 848
 849             $body .= '<TR><TD>&nbsp;&nbsp;</TD><TD>' .
 850                         "<A HREF=\"$DefaultLink\">$display_filename</A>&nbsp;</TD>" .
 851                         '<TD><SMALL><b>' . show_readable_size($message->header->size) .
 852                         '</b>&nbsp;&nbsp;</small></TD>' .
 853                         "<TD><SMALL>[ $type0/$type1 ]&nbsp;</SMALL></TD>" .
 854                         '<TD><SMALL>';
 855             if ($message->header->description) {
 856                 $body .= '<b>' . htmlspecialchars(_($message->header->description)) . '</b>';
 857             }
 858             $body .= '</SMALL></TD><TD><SMALL>&nbsp;';
 859
 860
 861             $SkipSpaces = 1;
 862             foreach ($Links as $Val) {
 863                 if ($SkipSpaces) {
 864                     $SkipSpaces = 0;
 865                 } else {
 866                     $body .= '&nbsp;&nbsp;|&nbsp;&nbsp;';
 867                 }
 868                 $body .= '<a href="' . $Val['href'] . '">' .  $Val['text'] . '</a>';
 869             }
 870
 871             unset($Links);
 872
 873             $body .= "</SMALL></TD></TR>\n";
 874
 875             return( $body );
 876
 877         } elseif (!$message->entities) {
 878
 879             $type0 = strtolower($message->header->type0);
 880             $type1 = strtolower($message->header->type1);
 881             $name = decodeHeader($message->header->name);
 882
 883             if ($message->header->entity_id != $ent_id) {
 884             $filename = decodeHeader($message->header->filename);
 885             if (trim($filename) == '') {
 886                 if (trim($name) == '') {
 887                     if ( trim( $message->header->id ) == '' )
 888                         $display_filename = 'untitled-[' . $message->header->entity_id . ']' ;
 889                     else
 890                         $display_filename = 'cid: ' . $message->header->id;
 891                     // $display_filename = 'untitled-[' . $message->header->entity_id . ']' ;
 892                 } else {
 893                     $display_filename = $name;
 894                     $filename = $name;
 895                 }
 896             } else {
 897                 $display_filename = $filename;
 898             }
 899
 900             $urlMailbox = urlencode($mailbox);
 901             $ent = urlencode($message->header->entity_id);
 902
 903             $DefaultLink =
 904                 "../src/download.php?startMessage=$startMessage&amp;passed_id=$id&amp;mailbox=$urlMailbox&amp;passed_ent_id=$ent";
 905             if ($where && $what) {
 906                 $DefaultLink .= '&amp;where=' . urlencode($where) . '&amp;what=' . urlencode($what);
 907             }
 908             $Links['download link']['text'] = _("download");
 909             $Links['download link']['href'] =
 910                 "../src/download.php?absolute_dl=true&amp;passed_id=$id&amp;mailbox=$urlMailbox&amp;passed_ent_id=$ent";
 911             $ImageURL = '';
 912
 913             /* this executes the attachment hook with a specific MIME-type.
 914                 * if that doens't have results, it tries if there's a rule
 915                 * for a more generic type. */
 916             $HookResults = do_hook("attachment $type0/$type1", $Links,
 917                 $startMessage, $id, $urlMailbox, $ent, $DefaultLink,
 918                 $display_filename, $where, $what);
 919             if(count($HookResults[1]) <= 1) {
 920                 $HookResults = do_hook("attachment $type0/*", $Links,
 921                 $startMessage, $id, $urlMailbox, $ent, $DefaultLink,
 922                 $display_filename, $where, $what);
 923             }
 924
 925             $Links = $HookResults[1];
 926             $DefaultLink = $HookResults[6];
 927
 928             $body .= '<TR><TD>&nbsp;&nbsp;</TD><TD>' .
 929                         "<A HREF=\"$DefaultLink\">$display_filename</A>&nbsp;</TD>" .
 930                         '<TD><SMALL><b>' . show_readable_size($message->header->size) .
 931                         '</b>&nbsp;&nbsp;</small></TD>' .
 932                         "<TD><SMALL>[ $type0/$type1 ]&nbsp;</SMALL></TD>" .
 933                         '<TD><SMALL>';
 934             if ($message->header->description) {
 935                 $body .= '<b>' . htmlspecialchars(_($message->header->description)) . '</b>';
 936             }
 937             $body .= '</SMALL></TD><TD><SMALL>&nbsp;';
 938
 939
 940             $SkipSpaces = 1;
 941             foreach ($Links as $Val) {
 942                 if ($SkipSpaces) {
 943                     $SkipSpaces = 0;
 944                 } else {
 945                     $body .= '&nbsp;&nbsp;|&nbsp;&nbsp;';
 946                 }
 947                 $body .= '<a href="' . $Val['href'] . '">' .  $Val['text'] . '</a>';
 948             }
 949
 950             unset($Links);
 951
 952             $body .= "</SMALL></TD></TR>\n";
 953             }
 954         } else {
 955             for ($i = 0; $i < count($message->entities); $i++) {
 956                 $body .= formatAttachments($message->entities[$i], $ent_id, $mailbox, $id);
 957             }
 958         }
 959     }
 960     return( $body );
 961 }
 962
 963
 964 /** this function decodes the body depending on the encoding type. **/
 965 function decodeBody($body, $encoding) {
 966   $body = str_replace("\r\n", "\n", $body);
 967   $encoding = strtolower($encoding);
 968
 969   global $show_html_default;
 970
 971   if ($encoding == 'quoted-printable') {
 972      $body = quoted_printable_decode($body);
 973
 974
 975      while (ereg("=\n", $body))
 976         $body = ereg_replace ("=\n", "", $body);
 977
 978   } else if ($encoding == 'base64') {
 979      $body = base64_decode($body);
 980   }
 981
 982   // All other encodings are returned raw.
 983   return $body;
 984 }
 985
 986 /*
 987  * This functions decode strings that is encoded according to
 988  * RFC1522 (MIME Part Two: Message Header Extensions for Non-ASCII Text).
 989  * Patched by Christian Schmidt <christian@ostenfeld.dk>  23/03/2002
 990  */
 991 function decodeHeader ($string, $utfencode=true) {
 992     if (is_array($string)) {
 993         $string = implode("\n", $string);
 994     }
 995     $i = 0;
 996     while (preg_match('/^(.{' . $i . '})(.*)=\?([^?]*)\?(Q|B)\?([^?]*)\?=/Ui',
 997                       $string, $res)) {
 998         $prefix = $res[1];
 999         // Ignore white-space between consecutive encoded-words
1000         if (strspn($res[2], " \t") != strlen($res[2])) {
1001             $prefix .= $res[2];
1002         }
1003
1004         if (ucfirst($res[4]) == 'B') {
1005             $replace = base64_decode($res[5]);
1006         } else {
1007             $replace = str_replace('_', ' ', $res[5]);
1008             $replace = preg_replace('/=([0-9a-f]{2})/ie', 'chr(hexdec("\1"))',
1009                                     $replace);
1010             /* Only encode into entities by default. Some places
1011                don't need the encoding, like the compose form. */
1012             if ($utfencode) {
1013                 $replace = charset_decode($res[3], $replace);
1014             }
1015         }
1016         $string = $prefix . $replace . substr($string, strlen($res[0]));
1017         $i = strlen($prefix) + strlen($replace);
1018     }
1019     return( $string );
1020 }
1021
1022 /*
1023  * Encode a string according to RFC 1522 for use in headers if it
1024  * contains 8-bit characters or anything that looks like it should
1025  * be encoded.
1026  */
1027 function encodeHeader ($string) {
1028     global $default_charset;
1029
1030     // Encode only if the string contains 8-bit characters or =?
1031     $j = strlen( $string  );
1032     $l = strstr($string, '=?');         // Must be encoded ?
1033     $ret = '';
1034     for( $i=0; $i < $j; ++$i) {
1035         switch( $string{$i} ) {
1036            case '=':
1037           $ret .= '=3D';
1038           break;
1039         case '?':
1040           $ret .= '=3F';
1041           break;
1042         case '_':
1043           $ret .= '=5F';
1044           break;
1045         case ' ':
1046           $ret .= '_';
1047           break;
1048         default:
1049           $k = ord( $string{$i} );
1050           if ( $k > 126 ) {
1051              $ret .= sprintf("=%02X", $k);
1052              $l = TRUE;
1053           } else
1054              $ret .= $string{$i};
1055         }
1056     }
1057
1058     if ( $l ) {
1059         $string = "=?$default_charset?Q?$ret?=";
1060     }
1061
1062     return( $string );
1063 }
1064
1065 /*
1066     Strips dangerous tags from html messages.
1067 */
1068 function MagicHTML( $body, $id ) {
1069
1070     global $message, $HTTP_SERVER_VARS,
1071            $attachment_common_show_images;
1072
1073     $attachment_common_show_images =
1074                      FALSE; // Don't display attached images in HTML mode
1075     $j = strlen( $body );   // Legnth of the HTML
1076     $ret = '';              // Returned string
1077     $bgcolor = '#ffffff';   // Background style color (defaults to white)
1078     $textcolor = '#000000'; // Foreground style color (defaults to black)
1079     $leftmargin = '';       // Left margin style
1080     $title = '';            // HTML title if any
1081
1082     $i = 0;
1083     while ( $i < $j ) {
1084         if ( $body{$i} == '<' ) {
1085             $pos = $i + 1;
1086             $tag = '';
1087             while ($body{$pos} == ' ' || $body{$pos} == "\t" ||
1088                    $body{$pos} == "\n") {
1089                 $pos ++;
1090             }
1091             while (strlen($tag) < 4 && $body{$pos} != ' ' &&
1092                    $body{$pos} != "\t" && $body{$pos} != "\n" &&
1093                    $pos < $j ) {
1094                 if ($body{$pos} == "<"){
1095                     $tag = '';
1096                     $pos++;
1097                 }
1098                 $tag .= $body{$pos};
1099                 $pos ++;
1100             }
1101             /*
1102                A comment in HTML is only three characters and isn't
1103                guaranteed to have a space after it.  This fudges so
1104                it will be caught by the switch statement.
1105             */
1106             if (ereg("!--", $tag)) {
1107                 $tag = "!-- ";
1108             }
1109             switch( strtoupper( $tag ) ) {
1110             // Strips the entire tag and contents
1111             case 'APPL':
1112             case 'EMBE':
1113             case 'FRAM':
1114             case 'SCRI':
1115             case 'OBJE':
1116                 $etg = '/' . $tag;
1117                 while ( $body{$i+1}.$body{$i+2}.$body{$i+3}.$body{$i+4}.$body{$i+5} <> $etg  &&
1118                        $i < $j  ) $i++;
1119                 while ( $i < $j && $body{++$i} <> '>' );
1120                 // $ret .= "<!-- $tag removed -->";
1121                 break;
1122             // Substitute Title
1123             case 'TITL':
1124                 $i += 5;
1125                 while ( $body{$i} <> '>' &&  // </title>
1126                        $i < $j )
1127                         $i++;
1128                 $i++;
1129                 $title = '';
1130                 while ( $body{$i} <> '<' &&  // </title>
1131                        $i < $j ) {
1132                     $title .= $body{$i};
1133                     $i++;
1134                 }
1135                 $i += 7;
1136                 break;
1137             // Destroy these tags
1138             case 'HTML':
1139             case 'HEAD':
1140             case '/HTM':
1141             case '/HEA':
1142             case '!DOC':
1143             case 'META':
1144             //case 'DIV ':
1145             //case '/DIV':
1146             case '!-- ':
1147                 $i += 4;
1148                 while ( $body{$i}  <> '>' &&
1149                        $i < $j )
1150                     $i++;
1151                 // $i++;
1152                 break;
1153             case 'STYL':
1154                 $i += 5;
1155                 while ( $body{$i} <> '>' &&  // </title>
1156                        $i < $j )
1157                         $i++;
1158                 $i++;
1159                 // We parse the style to look for interesting stuff
1160                 $styleblk = '';
1161                 while ( $body{$i} <> '>' &&
1162                        $i < $j ) {
1163                     // First we get the name of the style
1164                     $style = '';
1165                     while ( $body{$i} <> '>' &&
1166                            $body{$i} <> '<' &&
1167                            $body{$i} <> '{' &&
1168                            $i < $j ) {
1169                        if ( isnoSep( $body{$i} ) )
1170                            $style .= $body{$i};
1171                        $i++;
1172                     }
1173                     stripComments( $i, $j, $body );
1174                     $style = strtoupper( trim( $style ) );
1175                     if ( $style == 'BODY' ) {
1176                         // Next we look into the definitions of the body style
1177                         while ( $body{$i} <> '>' &&
1178                                $body{$i} <> '}' &&
1179                                $i < $j ) {
1180                             // We look for the background color if any.
1181                             if ( substr( $body, $i, 17 ) == 'BACKGROUND-COLOR:' ) {
1182                                 $i += 17;
1183                                 $bgcolor = getStyleData( $i, $j, $body );
1184                             } elseif ( substr( $body, $i, 12 ) == 'MARGIN-LEFT:' ) {
1185                                 $i += 12;
1186                                 $leftmargin = getStyleData( $i, $j, $body );
1187                             }
1188                             $i++;
1189                         }
1190                     } else {
1191                         // Other style are mantained
1192                         $styleblk .= "$style ";
1193                         while ( $body{$i} <> '>' &&
1194                                $body{$i} <> '<' &&
1195                                $body{$i} <> '}' &&
1196                                $i < $j ) {
1197                             $styleblk .= $body{$i};
1198                             $i++;
1199                         }
1200                         $styleblk .= $body{$i};
1201                     }
1202                     stripComments( $i, $j, $body );
1203                     if ( $body{$i} <> '>' )
1204                         $i++;
1205                 }
1206                 if ( $styleblk <> '' )
1207                     $ret .= "<style>$styleblk";
1208                 break;
1209             case 'BODY':
1210                 if ( $title <> '' )
1211                     $ret .= '<b>' . _("Title:") . " </b>$title<br>\n";
1212                 $ret .= "<TABLE";
1213                 $i += 5;
1214                 if (! isset($base)) {
1215                     $base = '';
1216                 }
1217                 $ret .= stripEvent( $i, $j, $body, $id, $base );
1218                 $ret .= " bgcolor=$bgcolor width=\"100%\"><tr>";
1219                 if ( $leftmargin <> '' )
1220                     $ret .= "<td width=$leftmargin>&nbsp;</td>";
1221                 $ret .= '<td>';
1222                 if (strtolower($bgcolor) == 'ffffff' ||
1223                     strtolower($bgcolor) == '#ffffff')
1224                     $ret .= '<font color=#000000>';
1225                 break;
1226             case 'BASE':
1227                 $i += 4;
1228                 $base = '';
1229                 if ( strncasecmp($body{$i}, 'font', 4) ) {
1230                     $i += 5;
1231                     while ( !isNoSep( $body{$i} ) && $i < $j ) {
1232                         $i++;
1233                     }
1234                     while ( $body{$i} <> '>' && $i < $j ) {
1235                             $base .= $body{$i};
1236                         $i++;
1237                     }
1238                     $ret .= "<BASEFONT $base>\n";
1239                     break;
1240                 }
1241                 $i++;
1242                 while ( !isNoSep( $body{$i} ) &&
1243                        $i < $j ) {
1244                         $i++;
1245                 }
1246                 if ( strcasecmp( substr( $base, 0, 4 ), 'href'  ) ) {
1247                         $i += 5;
1248                         while ( !isNoSep( $body{$i} ) &&
1249                                $i < $j ) {
1250                                 $i++;
1251                         }
1252                         while ( $body{$i} <> '>' &&
1253                                $i < $j ) {
1254                             if ( $body{$i} <> '"' ) {
1255                                 $base .= $body{$i};
1256                             }
1257                             $i++;
1258                         }
1259                         // Debuging $ret .= "<!-- base == $base -->";
1260                         if ( strcasecmp( substr( $base, 0, 4 ), 'file' ) <> 0 ) {
1261                             $ret .= "\n<BASE HREF=\"$base\">\n";
1262                         }
1263                 }
1264                 break;
1265             case '/BOD':
1266                 $ret .= '</font></td></tr></TABLE>';
1267                 $i += 6;
1268                 break;
1269             default:
1270                 // Following tags can contain some event handler, lets search it
1271                 stripComments( $i, $j, $body );
1272                 if (! isset($base)) {
1273                    $base = '';
1274                 }
1275                 $ret .= stripEvent( $i, $j, $body, $id, $base ) . '>';
1276                         // $ret .= "<!-- $tag detected -->";
1277             }
1278         } else {
1279             $ret .= $body{$i};
1280         }
1281     $i++;
1282     }
1283
1284 return( "\n\n<!-- HTML Output ahead -->\n" .
1285         $ret .
1286         /* Base is illegal within HTML
1287         "\n<!-- END of HTML Output --><base href=\"".
1288         get_location() . '/'.
1289         "\">\n\n" );
1290         */
1291         "\n<!-- END of HTML Output -->\n\n" );
1292 }
1293
1294 function isNoSep( $char ) {
1295
1296     switch( $char ) {
1297     case ' ':
1298     case "\n":
1299     case "\t":
1300     case "\r":
1301     case '>':
1302     case '"':
1303         return( FALSE );
1304         break;
1305     default:
1306         return( TRUE );
1307     }
1308
1309 }
1310
1311 /*
1312   The following function is usefull to remove extra data that can cause
1313   html not to display properly. Especialy with MS stuff.
1314 */
1315
1316 function stripComments( &$i, $j, &$body ) {
1317
1318     while ( $body{$i}.$body{$i+1}.$body{$i+2}.$body{$i+3} == '<!--' &&
1319            $i < $j ) {
1320         $i += 5;
1321         while ( $body{$i-2}.$body{$i-1}.$body{$i} <> '-->' &&
1322                $i < $j )
1323             $i++;
1324         $i++;
1325     }
1326
1327     return;
1328
1329 }
1330
1331 /* Gets the style data of a specific style */
1332
1333 function getStyleData( &$i, $j, &$body ) {
1334
1335     // We skip spaces
1336     while ( $body{$i} <> '>' && !isNoSep( $body{$i} ) &&
1337            $i < $j ) {
1338         $i++;
1339     }
1340     // And get the color
1341     $ret = '';
1342     while ( isNoSep( $body{$i} ) &&
1343            $i < $j ) {
1344         $ret .= $body{$i};
1345         $i++;
1346     }
1347
1348     return( $ret );
1349 }
1350
1351 /*
1352 Private function for strip_dangerous_tag. Look for event based coded and "remove" it
1353 change on with no (onload -> noload)
1354 */
1355
1356 function stripEvent( &$i, $j, &$body, $id, $base ) {
1357
1358     global $message, $base_uri, $has_unsafe_images, $view_unsafe_images;
1359
1360     $ret = '';
1361
1362     while ( $body{$i} <> '>' &&
1363            $i < $j ) {
1364         /**
1365          * [ 545933 ] Cross-site scripting vulnerability
1366          * <hr>
1367          * <img x="<foo>" src=javascript:alert(1) y="</foo>">
1368          * <hr>
1369          *
1370          * This code will ignore anything within the quotes
1371          * so they don't mess us up.
1372          */
1373         if ( $body{$i} == '"' || $body{$i} == "'" ){
1374             $quotechar = $body{$i};
1375             do {
1376                 $ret .= $body{$i};
1377                 $i++;
1378             } while ($body{$i} != $quotechar && $i < $j);
1379         }
1380         $etg = strtolower($body{$i}.$body{$i+1}.$body{$i+2});
1381         switch( $etg ) {
1382         case 'src':
1383             // This is probably a src specification
1384             $k = $i + 3;
1385             while( !isNoSep( $body{$k} )) {
1386                 $k++;
1387             }
1388             if ( $body{$k} == '=' ) {
1389                 /* It is indeed */
1390                 $k++;
1391                 while( !isNoSep( $body{$k} ) &&
1392                        $k < $j ) {
1393                     $k++;
1394                 }
1395                 $src = '';
1396                 while ( $body{$k} <> '>' && isNoSep( $body{$k} ) &&
1397                        $k < $j ) {
1398                     $src .= $body{$k};
1399                     $k++;
1400                 }
1401                 $k++;
1402                 while( !isNoSep( $body{$k} ) &&
1403                        $k < $j ) {
1404                     $k++;
1405                 }
1406                 $k++;
1407                 if ( strtolower( substr( $src, 0, 4 ) ) == 'cid:' ) {
1408                     $src = substr( $src, 4 );
1409                     $src = "../src/download.php?absolute_dl=true&amp;passed_id=$id&amp;mailbox=" .
1410                            urlencode( $message->header->mailbox ) .
1411                            "&amp;passed_ent_id=" . find_ent_id( $src, $message );
1412                 } else if ( strtolower( substr( $src, 0, 4 ) ) <> 'http' ||
1413                             stristr( $src, $base_uri ) ) {
1414                     /* Javascript and local urls goes out */
1415                     if (!$view_unsafe_images) {
1416                         $src = '../images/' . _("sec_remove_eng.png");
1417                     }
1418                     $has_unsafe_images = 1;
1419                 }
1420                 $ret .= 'src="' . $src . '" ';
1421                 $i = $k - 2;
1422             } else {
1423                 $ret .= 'src';
1424                 $i = $i + 3;
1425             }
1426
1427             break;
1428         case '../':
1429             // Retrolinks are not allowed without a base because they mess with SM security
1430             if ( $base == '' ) {
1431                     $i += 2;
1432             } else {
1433                     $ret .= '.';
1434             }
1435             break;
1436         case 'cid':
1437             // Internal link
1438             $k = $i-1;
1439             if ( $body{$i+3} == ':') {
1440                 $i +=4;
1441                 $name = '';
1442                 while ( isNoSep( $body{$i} ) &&
1443                        $i < $j  ) {
1444                     $name .= $body{$i++};
1445                 }
1446                 if ( $name <> '' ) {
1447                     $ret .= "../src/download.php?absolute_dl=true&amp;passed_id=$id&amp;mailbox=" .
1448                                 urlencode( $message->header->mailbox ) .
1449                                 "&amp;passed_ent_id=" . find_ent_id( $name, $message );
1450                     if ( $body{$k} == '"' )
1451                         $ret .= '" ';
1452                     else
1453                         $ret .= ' ';
1454                 }
1455                 if ( $body{$i} == '>' )
1456                     $i -= 1;
1457             }
1458             break;
1459         case ' on':
1460         case "\non":
1461         case "\ron":
1462         case "\ton":
1463             $ret .= ' no';
1464             $i += 2;
1465             break;
1466         case 'pt:':
1467             if ( strcasecmp( $body{$i-4}.$body{$i-3}.$body{$i-2}.$body{$i-1}.$body{$i}.$body{$i+1}.$body{$i+2}, 'script:') == 0 ) {
1468                 $ret .= '_no/';
1469             } else {
1470                 $ret .= $etg;
1471             }
1472             $i += 2;
1473             break;
1474         default:
1475             $ret .= $body{$i};
1476         }
1477         $i++;
1478     }
1479     return( $ret );
1480 }
1481
1482
1483 /* This function trys to locate the entity_id of a specific mime element */
1484
1485 function find_ent_id( $id, $message ) {
1486     $ret = '';
1487     for ($i=0; $ret == '' && $i < count($message->entities); $i++) {
1488         if ( $message->entities[$i]->header->entity_id == '' || $message->entities[$i]->header->type ) {
1489             $ret = find_ent_id( $id, $message->entities[$i] );
1490         } else {
1491             if ( strcasecmp( $message->entities[$i]->header->id, $id ) == 0 )
1492                 $ret = $message->entities[$i]->header->entity_id;
1493         }
1494
1495     }
1496
1497     return( $ret );
1498
1499 }
1500 ?>