class/deliver/Deliver.class.php

   1 <?php
   2 /**
   3  * Deliver.class.php
   4  *
   5  * Copyright (c) 1999-2005 The SquirrelMail Project Team
   6  * Licensed under the GNU GPL. For full terms see the file COPYING.
   7  *
   8  * This contains all the functions needed to send messages through
   9  * a delivery backend.
  10  *
  11  * @version $Id$
  12  * @author  Marc Groot Koerkamp
  13  * @package squirrelmail
  14  */
  15
  16 /**
  17  * Deliver Class - called to actually deliver the message
  18  *
  19  * This class is called by compose.php and other code that needs
  20  * to send messages.  All delivery functionality should be centralized
  21  * in this class.
  22  *
  23  * Do not place UI code in this class, as UI code should be placed in templates
  24  * going forward.
  25  *
  26  * @author  Marc Groot Koerkamp
  27  * @package squirrelmail
  28  */
  29 class Deliver {
  30
  31     /**
  32      * function mail - send the message parts to the SMTP stream
  33      *
  34      * @param Message  $message  Message class to send
  35      * @param resource $stream   file handle to the SMTP stream
  36      *
  37      * @return integer $raw_length
  38      */
  39     function mail($message, $stream=false) {
  40         $rfc822_header = $message->rfc822_header;
  41         if (count($message->entities)) {
  42             $boundary = $this->mimeBoundary();
  43             $rfc822_header->content_type->properties['boundary']='"'.$boundary.'"';
  44         } else {
  45             $boundary='';
  46         }
  47         $raw_length = 0;
  48         $reply_rfc822_header = (isset($message->reply_rfc822_header)
  49                              ? $message->reply_rfc822_header : '');
  50         $header = $this->prepareRFC822_Header($rfc822_header, $reply_rfc822_header, $raw_length);
  51
  52         if ($stream) {
  53             $this->preWriteToStream($header);
  54             $this->writeToStream($stream, $header);
  55         }
  56         $this->writeBody($message, $stream, $raw_length, $boundary);
  57         return $raw_length;
  58     }
  59
  60     /**
  61      * function writeBody - generate and write the mime boundaries around each part to the stream
  62      *
  63      * Recursively formats and writes the MIME boundaries of the $message
  64      * to the output stream.
  65      *
  66      * @param Message   $message      Message object to transform
  67      * @param resource  $stream       SMTP output stream
  68      * @param integer  &$length_raw   raw length of the message (part)
  69      *                                as returned by mail fn
  70      * @param string    $boundary     custom boundary to call, usually for subparts
  71      *
  72      * @return void
  73      */
  74     function writeBody($message, $stream, &$length_raw, $boundary='') {
  75         // calculate boundary in case of multidimensional mime structures
  76         if ($boundary && $message->entity_id && count($message->entities)) {
  77             if (strpos($boundary,'_part_')) {
  78                 $boundary = substr($boundary,0,strpos($boundary,'_part_'));
  79
  80             // the next four lines use strrev to reverse any nested boundaries
  81             // because RFC 2046 (5.1.1) says that if a line starts with the outer
  82             // boundary string (doesn't matter what the line ends with), that
  83             // can be considered a match for the outer boundary; thus the nested
  84             // boundary needs to be unique from the outer one
  85             //
  86             } else if (strpos($boundary,'_trap_')) {
  87                 $boundary = substr(strrev($boundary),0,strpos(strrev($boundary),'_part_'));
  88             }
  89             $boundary_new = strrev($boundary . '_part_'.$message->entity_id);
  90         } else {
  91             $boundary_new = $boundary;
  92         }
  93         if ($boundary && !$message->rfc822_header) {
  94             $s = '--'.$boundary."\r\n";
  95             $s .= $this->prepareMIME_Header($message, $boundary_new);
  96             $length_raw += strlen($s);
  97             if ($stream) {
  98                 $this->preWriteToStream($s);
  99                 $this->writeToStream($stream, $s);
 100             }
 101         }
 102         $this->writeBodyPart($message, $stream, $length_raw);
 103
 104         $last = false;
 105         for ($i=0, $entCount=count($message->entities);$i<$entCount;$i++) {
 106             $msg = $this->writeBody($message->entities[$i], $stream, $length_raw, $boundary_new);
 107             if ($i == $entCount-1) $last = true;
 108         }
 109         if ($boundary && $last) {
 110             $s = "--".$boundary_new."--\r\n\r\n";
 111             $length_raw += strlen($s);
 112             if ($stream) {
 113                 $this->preWriteToStream($s);
 114                 $this->writeToStream($stream, $s);
 115             }
 116         }
 117     }
 118
 119     /**
 120      * function writeBodyPart - write each individual mimepart
 121      *
 122      * Recursively called by WriteBody to write each mime part to the SMTP stream
 123      *
 124      * @param Message   $message      Message object to transform
 125      * @param resource  $stream       SMTP output stream
 126      * @param integer  &$length       length of the message part
 127      *                                as returned by mail fn
 128      *
 129      * @return void
 130      */
 131     function writeBodyPart($message, $stream, &$length) {
 132         if ($message->mime_header) {
 133             $type0 = $message->mime_header->type0;
 134         } else {
 135             $type0 = $message->rfc822_header->content_type->type0;
 136         }
 137
 138         $body_part_trailing = $last = '';
 139         switch ($type0)
 140         {
 141         case 'text':
 142         case 'message':
 143             if ($message->body_part) {
 144                 $body_part = $message->body_part;
 145                 // remove NUL characters
 146                 $body_part = str_replace("\0",'',$body_part);
 147                 $length += $this->clean_crlf($body_part);
 148                 if ($stream) {
 149                     $this->preWriteToStream($body_part);
 150                     $this->writeToStream($stream, $body_part);
 151                 }
 152                 $last = $body_part;
 153             } elseif ($message->att_local_name) {
 154                 $filename = $message->att_local_name;
 155                 $file = fopen ($filename, 'rb');
 156                 while ($body_part = fgets($file, 4096)) {
 157                     // remove NUL characters
 158                     $body_part = str_replace("\0",'',$body_part);
 159                     $length += $this->clean_crlf($body_part);
 160                     if ($stream) {
 161                         $this->preWriteToStream($body_part);
 162                         $this->writeToStream($stream, $body_part);
 163                     }
 164                     $last = $body_part;
 165                 }
 166                 fclose($file);
 167             }
 168             break;
 169         default:
 170             if ($message->body_part) {
 171                 $body_part = $message->body_part;
 172                 // remove NUL characters
 173                 $body_part = str_replace("\0",'',$body_part);
 174                 $length += $this->clean_crlf($body_part);
 175                 if ($stream) {
 176                     $this->writeToStream($stream, $body_part);
 177                 }
 178             } elseif ($message->att_local_name) {
 179                 $filename = $message->att_local_name;
 180                 $file = fopen ($filename, 'rb');
 181                 while ($tmp = fread($file, 570)) {
 182                     $body_part = chunk_split(base64_encode($tmp));
 183                     // Up to 4.3.10 chunk_split always appends a newline,
 184                     // while in 4.3.11 it doesn't if the string to split
 185                     // is shorter than the chunk length.
 186                     if( substr($body_part, -1 , 1 ) != "\n" )
 187                         $body_part .= "\n";
 188                     $length += $this->clean_crlf($body_part);
 189                     if ($stream) {
 190                         $this->writeToStream($stream, $body_part);
 191                     }
 192                 }
 193                 fclose($file);
 194             }
 195             break;
 196         }
 197         $body_part_trailing = '';
 198         if ($last && substr($last,-1) != "\n") {
 199             $body_part_trailing = "\r\n";
 200         }
 201         if ($body_part_trailing) {
 202             $length += strlen($body_part_trailing);
 203             if ($stream) {
 204                 $this->preWriteToStream($body_part_trailing);
 205                 $this->writeToStream($stream, $body_part_trailing);
 206             }
 207         }
 208     }
 209
 210     /**
 211      * function clean_crlf - change linefeeds and newlines to legal characters
 212      *
 213      * The SMTP format only allows CRLF as line terminators.
 214      * This function replaces illegal teminators with the correct terminator.
 215      *
 216      * @param string &$s string to clean linefeeds on
 217      *
 218      * @return void
 219      */
 220     function clean_crlf(&$s) {
 221         $s = str_replace("\r\n", "\n", $s);
 222         $s = str_replace("\r", "\n", $s);
 223         $s = str_replace("\n", "\r\n", $s);
 224         return strlen($s);
 225     }
 226
 227     /**
 228      * function strip_crlf - strip linefeeds and newlines from a string
 229      *
 230      * The SMTP format only allows CRLF as line terminators.
 231      * This function strips all line terminators from the string.
 232      *
 233      * @param string &$s string to clean linefeeds on
 234      *
 235      * @return void
 236      */
 237     function strip_crlf(&$s) {
 238         $s = str_replace("\r\n ", '', $s);
 239         $s = str_replace("\r", '', $s);
 240         $s = str_replace("\n", '', $s);
 241     }
 242
 243     /**
 244      * function preWriteToStream - reserved for extended functionality
 245      *
 246      * This function is not yet implemented.
 247      * Reserved for extended functionality.
 248      *
 249      * @param string &$s string to operate on
 250      *
 251      * @return void
 252      */
 253     function preWriteToStream(&$s) {
 254     }
 255
 256     /**
 257      * function writeToStream - write data to the SMTP stream
 258      *
 259      * @param resource $stream  SMTP output stream
 260      * @param string   $data    string with data to send to the SMTP stream
 261      *
 262      * @return void
 263      */
 264     function writeToStream($stream, $data) {
 265         fputs($stream, $data);
 266     }
 267
 268     /**
 269      * function initStream - reserved for extended functionality
 270      *
 271      * This function is not yet implemented.
 272      * Reserved for extended functionality.
 273      *
 274      * @param Message $message  Message object
 275      * @param string  $host     host name or IP to connect to
 276      * @param string  $user     username to log into the SMTP server with
 277      * @param string  $pass     password to log into the SMTP server with
 278      * @param integer $length
 279      *
 280      * @return handle $stream file handle resource to SMTP stream
 281      */
 282     function initStream($message, $length=0, $host='', $port='', $user='', $pass='') {
 283         return $stream;
 284     }
 285
 286     /**
 287      * function getBCC - reserved for extended functionality
 288      *
 289      * This function is not yet implemented.
 290      * Reserved for extended functionality.
 291      *
 292      */
 293     function getBCC() {
 294         return false;
 295     }
 296
 297     /**
 298      * function prepareMIME_Header - creates the mime header
 299      *
 300      * @param Message $message  Message object to act on
 301      * @param string  $boundary mime boundary from fn MimeBoundary
 302      *
 303      * @return string $header properly formatted mime header
 304      */
 305     function prepareMIME_Header($message, $boundary) {
 306         $mime_header = $message->mime_header;
 307         $rn="\r\n";
 308         $header = array();
 309
 310         $contenttype = 'Content-Type: '. $mime_header->type0 .'/'.
 311                         $mime_header->type1;
 312         if (count($message->entities)) {
 313             $contenttype .= ';' . 'boundary="'.$boundary.'"';
 314         }
 315         if (isset($mime_header->parameters['name'])) {
 316             $contenttype .= '; name="'.
 317             encodeHeader($mime_header->parameters['name']). '"';
 318         }
 319         if (isset($mime_header->parameters['charset'])) {
 320             $charset = $mime_header->parameters['charset'];
 321             $contenttype .= '; charset="'.
 322             encodeHeader($charset). '"';
 323         }
 324
 325         $header[] = $contenttype . $rn;
 326         if ($mime_header->description) {
 327             $header[] = 'Content-Description: ' . $mime_header->description . $rn;
 328         }
 329         if ($mime_header->encoding) {
 330             $header[] = 'Content-Transfer-Encoding: ' . $mime_header->encoding . $rn;
 331         } else {
 332             if ($mime_header->type0 == 'text' || $mime_header->type0 == 'message') {
 333                 $header[] = 'Content-Transfer-Encoding: 8bit' .  $rn;
 334             } else {
 335                 $header[] = 'Content-Transfer-Encoding: base64' .  $rn;
 336             }
 337         }
 338         if ($mime_header->id) {
 339             $header[] = 'Content-ID: ' . $mime_header->id . $rn;
 340         }
 341         if ($mime_header->disposition) {
 342             $disposition = $mime_header->disposition;
 343             $contentdisp = 'Content-Disposition: ' . $disposition->name;
 344             if ($disposition->getProperty('filename')) {
 345                 $contentdisp .= '; filename="'.
 346                 encodeHeader($disposition->getProperty('filename')). '"';
 347             }
 348             $header[] = $contentdisp . $rn;
 349         }
 350         if ($mime_header->md5) {
 351             $header[] = 'Content-MD5: ' . $mime_header->md5 . $rn;
 352         }
 353         if ($mime_header->language) {
 354             $header[] = 'Content-Language: ' . $mime_header->language . $rn;
 355         }
 356
 357         $cnt = count($header);
 358         $hdr_s = '';
 359         for ($i = 0 ; $i < $cnt ; $i++)    {
 360             $hdr_s .= $this->foldLine($header[$i], 78,str_pad('',4));
 361         }
 362         $header = $hdr_s;
 363         $header .= $rn; /* One blank line to separate mimeheader and body-entity */
 364         return $header;
 365     }
 366
 367     /**
 368      * function prepareRFC822_Header - prepares the RFC822 header string from Rfc822Header object(s)
 369      *
 370      * This function takes the Rfc822Header object(s) and formats them
 371      * into the RFC822Header string to send to the SMTP server as part
 372      * of the SMTP message.
 373      *
 374      * @param Rfc822Header  $rfc822_header
 375      * @param Rfc822Header  $reply_rfc822_header
 376      * @param integer      &$raw_length length of the message
 377      *
 378      * @return string $header
 379      */
 380     function prepareRFC822_Header($rfc822_header, $reply_rfc822_header, &$raw_length) {
 381         global $domain, $version, $username, $encode_header_key, $edit_identity, $hide_auth_header;
 382
 383         /* if server var SERVER_NAME not available, use $domain */
 384         if(!sqGetGlobalVar('SERVER_NAME', $SERVER_NAME, SQ_SERVER)) {
 385             $SERVER_NAME = $domain;
 386         }
 387
 388         sqGetGlobalVar('REMOTE_ADDR', $REMOTE_ADDR, SQ_SERVER);
 389         sqGetGlobalVar('REMOTE_PORT', $REMOTE_PORT, SQ_SERVER);
 390         sqGetGlobalVar('REMOTE_HOST', $REMOTE_HOST, SQ_SERVER);
 391         sqGetGlobalVar('HTTP_VIA',    $HTTP_VIA,    SQ_SERVER);
 392         sqGetGlobalVar('HTTP_X_FORWARDED_FOR', $HTTP_X_FORWARDED_FOR, SQ_SERVER);
 393
 394         $rn = "\r\n";
 395
 396         /* This creates an RFC 822 date */
 397         $date = date('D, j M Y H:i:s ', mktime()) . $this->timezone();
 398         /* Create a message-id */
 399         $message_id = '<' . $REMOTE_PORT . '.';
 400         if (isset($encode_header_key) && trim($encode_header_key)!='') {
 401             // use encrypted form of remote address
 402             $message_id.= OneTimePadEncrypt($this->ip2hex($REMOTE_ADDR),base64_encode($encode_header_key));
 403         } else {
 404             $message_id.= $REMOTE_ADDR;
 405         }
 406         $message_id .= '.' . time() . '.squirrel@' . $SERVER_NAME .'>';
 407         /* Make an RFC822 Received: line */
 408         if (isset($REMOTE_HOST)) {
 409             $received_from = "$REMOTE_HOST ([$REMOTE_ADDR])";
 410         } else {
 411             $received_from = $REMOTE_ADDR;
 412         }
 413         if (isset($HTTP_VIA) || isset ($HTTP_X_FORWARDED_FOR)) {
 414             if (!isset($HTTP_X_FORWARDED_FOR) || $HTTP_X_FORWARDED_FOR == '') {
 415                 $HTTP_X_FORWARDED_FOR = 'unknown';
 416             }
 417             $received_from .= " (proxying for $HTTP_X_FORWARDED_FOR)";
 418         }
 419         $header = array();
 420
 421         /**
 422          * SquirrelMail header
 423          *
 424          * This Received: header provides information that allows to track
 425          * user and machine that was used to send email. Don't remove it
 426          * unless you understand all possible forging issues or your
 427          * webmail installation does not prevent changes in user's email address.
 428          * See SquirrelMail bug tracker #847107 for more details about it.
 429          */
 430         if (isset($encode_header_key) &&
 431             trim($encode_header_key)!='') {
 432             // use encoded headers, if encryption key is set and not empty
 433             $header[] = 'X-Squirrel-UserHash: '.OneTimePadEncrypt($username,base64_encode($encode_header_key)).$rn;
 434             $header[] = 'X-Squirrel-FromHash: '.OneTimePadEncrypt($this->ip2hex($REMOTE_ADDR),base64_encode($encode_header_key)).$rn;
 435             if (isset($HTTP_X_FORWARDED_FOR))
 436                 $header[] = 'X-Squirrel-ProxyHash:'.OneTimePadEncrypt($this->ip2hex($HTTP_X_FORWARDED_FOR),base64_encode($encode_header_key)).$rn;
 437         } else {
 438             // use default received headers
 439             $header[] = "Received: from $received_from" . $rn;
 440             if ($edit_identity || ! isset($hide_auth_header) || ! $hide_auth_header)
 441                 $header[] = "        (SquirrelMail authenticated user $username)" . $rn;
 442             $header[] = "        by $SERVER_NAME with HTTP;" . $rn;
 443             $header[] = "        $date" . $rn;
 444         }
 445
 446         /* Insert the rest of the header fields */
 447         $header[] = 'Message-ID: '. $message_id . $rn;
 448         if ($reply_rfc822_header->message_id) {
 449             $rep_message_id = $reply_rfc822_header->message_id;
 450         //        $this->strip_crlf($message_id);
 451             $header[] = 'In-Reply-To: '.$rep_message_id . $rn;
 452             $references = $this->calculate_references($reply_rfc822_header);
 453             $header[] = 'References: '.$references . $rn;
 454         }
 455         $header[] = "Date: $date" . $rn;
 456         $header[] = 'Subject: '.encodeHeader($rfc822_header->subject) . $rn;
 457         $header[] = 'From: '. $rfc822_header->getAddr_s('from',",$rn ",true) . $rn;
 458
 459         // folding address list [From|To|Cc|Bcc] happens by using ",$rn<space>" as delimiter
 460         // Do not use foldLine for that.
 461
 462         // RFC2822 if from contains more then 1 address
 463         if (count($rfc822_header->from) > 1) {
 464             $header[] = 'Sender: '. $rfc822_header->getAddr_s('sender',',',true) . $rn;
 465         }
 466         if (count($rfc822_header->to)) {
 467             $header[] = 'To: '. $rfc822_header->getAddr_s('to',",$rn ",true) . $rn;
 468         }
 469         if (count($rfc822_header->cc)) {
 470             $header[] = 'Cc: '. $rfc822_header->getAddr_s('cc',",$rn ",true) . $rn;
 471         }
 472         if (count($rfc822_header->reply_to)) {
 473             $header[] = 'Reply-To: '. $rfc822_header->getAddr_s('reply_to',',',true) . $rn;
 474         }
 475         /* Sendmail should return true. Default = false */
 476         $bcc = $this->getBcc();
 477         if (count($rfc822_header->bcc)) {
 478             $s = 'Bcc: '. $rfc822_header->getAddr_s('bcc',",$rn ",true) . $rn;
 479             if (!$bcc) {
 480                 $raw_length += strlen($s);
 481             } else {
 482                 $header[] = $s;
 483             }
 484         }
 485         /* Identify SquirrelMail */
 486         $header[] = 'User-Agent: SquirrelMail/' . $version . $rn;
 487         /* Do the MIME-stuff */
 488         $header[] = 'MIME-Version: 1.0' . $rn;
 489         $contenttype = 'Content-Type: '. $rfc822_header->content_type->type0 .'/'.
 490                                          $rfc822_header->content_type->type1;
 491         if (count($rfc822_header->content_type->properties)) {
 492             foreach ($rfc822_header->content_type->properties as $k => $v) {
 493                 if ($k && $v) {
 494                     $contenttype .= ';' .$k.'='.$v;
 495                 }
 496             }
 497         }
 498         $header[] = $contenttype . $rn;
 499         if ($encoding = $rfc822_header->encoding) {
 500             $header[] = 'Content-Transfer-Encoding: ' . $encoding .  $rn;
 501         }
 502         if ($rfc822_header->dnt) {
 503             $dnt = $rfc822_header->getAddr_s('dnt');
 504             /* Pegasus Mail */
 505             $header[] = 'X-Confirm-Reading-To: '.$dnt. $rn;
 506             /* RFC 2298 */
 507             $header[] = 'Disposition-Notification-To: '.$dnt. $rn;
 508         }
 509         if ($rfc822_header->priority) {
 510             switch($rfc822_header->priority)
 511             {
 512             case 1:
 513                 $header[] = 'X-Priority: 1 (Highest)'.$rn;
 514                 $header[] = 'Importance: High'. $rn; break;
 515             case 5:
 516                 $header[] = 'X-Priority: 5 (Lowest)'.$rn;
 517                 $header[] = 'Importance: Low'. $rn; break;
 518             default: break;
 519             }
 520         }
 521         /* Insert headers from the $more_headers array */
 522         if(count($rfc822_header->more_headers)) {
 523             reset($rfc822_header->more_headers);
 524             foreach ($rfc822_header->more_headers as $k => $v) {
 525                 $header[] = $k.': '.$v .$rn;
 526             }
 527         }
 528         $cnt = count($header);
 529         $hdr_s = '';
 530
 531         for ($i = 0 ; $i < $cnt ; $i++) {
 532             $sKey = substr($header[$i],0,strpos($header[$i],':'));
 533             switch ($sKey)
 534             {
 535             case 'Message-ID':
 536             case 'In-Reply_To':
 537                 $hdr_s .= $header[$i];
 538                 break;
 539             case 'References':
 540                 $sRefs = substr($header[$i],12);
 541                 $aRefs = explode(' ',$sRefs);
 542                 $sLine = 'References:';
 543                 foreach ($aRefs as $sReference) {
 544                     if (strlen($sLine)+strlen($sReference) >76) {
 545                         $hdr_s .= $sLine;
 546                         $sLine = $rn . '    ' . $sReference;
 547                     } else {
 548                         $sLine .= ' '. $sReference;
 549                     }
 550                 }
 551                 $hdr_s .= $sLine;
 552                 break;
 553             case 'To':
 554             case 'Cc':
 555             case 'Bcc':
 556             case 'From':
 557                 $hdr_s .= $header[$i];
 558                 break;
 559             default: $hdr_s .= $this->foldLine($header[$i], 78, str_pad('',4)); break;
 560             }
 561         }
 562         $header = $hdr_s;
 563         $header .= $rn; /* One blank line to separate header and body */
 564         $raw_length += strlen($header);
 565         return $header;
 566     }
 567
 568     /**
 569      * function foldLine - for cleanly folding of headerlines
 570      *
 571      * @param   string  $line
 572      * @param   integer $length length to fold the line at
 573      * @param   string  $pre    prefix the line with...
 574      *
 575      * @return string   $line folded line with trailing CRLF
 576      */
 577     function foldLine($line, $length, $pre='') {
 578         $line = substr($line,0, -2);
 579         $length -= 2; /* do not fold between \r and \n */
 580         $cnt = strlen($line);
 581         if ($cnt > $length) { /* try folding */
 582             $fold_string = "\r\n " . $pre;
 583             $bFirstFold = false;
 584             $aFoldLine = array();
 585             while (strlen($line) > $length) {
 586                 $fold = false;
 587                 /* handle encoded parts */
 588                 if (preg_match('/(=\?([^?]*)\?(Q|B)\?([^?]*)\?=)(\s+|.*)/Ui',$line,$regs)) {
 589                     $fold_tmp = $regs[1];
 590                     if (!trim($regs[5])) {
 591                         $fold_tmp .= $regs[5];
 592                     }
 593                     $iPosEnc = strpos($line,$fold_tmp);
 594                     $iLengthEnc = strlen($fold_tmp);
 595                     $iPosEncEnd = $iPosEnc+$iLengthEnc;
 596                     if ($iPosEnc < $length && (($iPosEncEnd) > $length)) {
 597                         $fold = true;
 598                         /* fold just before the start of the encoded string */
 599                         if ($iPosEnc) {
 600                             $aFoldLine[] = substr($line,0,$iPosEnc);
 601                         }
 602                         $line = substr($line,$iPosEnc);
 603                         if (!$bFirstFold) {
 604                             $bFirstFold = true;
 605                             $length -= strlen($fold_string);
 606                         }
 607                         if ($iLengthEnc > $length) { /* place the encoded
 608                             string on a separate line and do not fold inside it*/
 609                             /* minimize foldstring */
 610                             $fold_string = "\r\n ";
 611                             $aFoldLine[] = substr($line,0,$iLengthEnc);
 612                             $line = substr($line,$iLengthEnc);
 613                         }
 614                     } else if ($iPosEnc < $length) { /* the encoded string fits into the foldlength */
 615                         /*remainder */
 616                         $sLineRem = substr($line,$iPosEncEnd,$length - $iPosEncEnd);
 617                         if (preg_match('/^(=\?([^?]*)\?(Q|B)\?([^?]*)\?=)(.*)/Ui',$sLineRem) || !preg_match('/[=,;\s]/',$sLineRem)) {
 618                             /*impossible to fold clean in the next part -> fold after the enc string */
 619                             $aFoldLine[] = substr($line,0,$iPosEncEnd);
 620                             $line = substr($line,$iPosEncEnd);
 621                             $fold = true;
 622                             if (!$bFirstFold) {
 623                                 $bFirstFold = true;
 624                                 $length -= strlen($fold_string);
 625                             }
 626                         }
 627                     }
 628                 }
 629                 if (!$fold) {
 630                     $line_tmp = substr($line,0,$length);
 631                     $iFoldPos = false;
 632                     /* try to fold at logical places */
 633                     switch (true)
 634                     {
 635                     case ($iFoldPos = strrpos($line_tmp,',')): break;
 636                     case ($iFoldPos = strrpos($line_tmp,';')): break;
 637                     case ($iFoldPos = strrpos($line_tmp,' ')): break;
 638                     case ($iFoldPos = strrpos($line_tmp,'=')): break;
 639                     default: break;
 640                     }
 641
 642                     if (!$iFoldPos) { /* clean folding didn't work */
 643                         $iFoldPos = $length;
 644                     }
 645                     $aFoldLine[] = substr($line,0,$iFoldPos+1);
 646                     $line = substr($line,$iFoldPos+1);
 647                     if (!$bFirstFold) {
 648                         $bFirstFold = true;
 649                         $length -= strlen($fold_string);
 650                     }
 651                 }
 652             }
 653             /*$reconstruct the line */
 654             if ($line) {
 655                 $aFoldLine[] = $line;
 656             }
 657             $line = implode($fold_string,$aFoldLine);
 658         }
 659         return $line."\r\n";
 660     }
 661
 662     /**
 663      * function mimeBoundary - calculates the mime boundary to use
 664      *
 665      * This function will generate a random mime boundary base part
 666      * for the message if the boundary has not already been set.
 667      *
 668      * @return string $mimeBoundaryString random mime boundary string
 669      */
 670     function mimeBoundary () {
 671         static $mimeBoundaryString;
 672
 673         if ( !isset( $mimeBoundaryString ) ||
 674             $mimeBoundaryString == '') {
 675             $mimeBoundaryString = '----=_' . date( 'YmdHis' ) . '_' .
 676             mt_rand( 10000, 99999 );
 677         }
 678         return $mimeBoundaryString;
 679     }
 680
 681     /**
 682      * function timezone - Time offset for correct timezone
 683      *
 684      * @return string $result with timezone and offset
 685      */
 686     function timezone () {
 687         global $invert_time;
 688
 689         $diff_second = date('Z');
 690         if ($invert_time) {
 691             $diff_second = - $diff_second;
 692         }
 693         if ($diff_second > 0) {
 694             $sign = '+';
 695         } else {
 696             $sign = '-';
 697         }
 698         $diff_second = abs($diff_second);
 699         $diff_hour = floor ($diff_second / 3600);
 700         $diff_minute = floor (($diff_second-3600*$diff_hour) / 60);
 701         $zonename = '('.strftime('%Z').')';
 702         $result = sprintf ("%s%02d%02d %s", $sign, $diff_hour, $diff_minute,
 703                        $zonename);
 704         return ($result);
 705     }
 706
 707     /**
 708      * function calculate_references - calculate correct Referer string
 709      *
 710      * @param   Rfc822Header $hdr    message header to calculate from
 711      *
 712      * @return  string       $refer  concatenated and trimmed Referer string
 713      */
 714     function calculate_references($hdr) {
 715         $refer = $hdr->references;
 716         $message_id = $hdr->message_id;
 717         $in_reply_to = $hdr->in_reply_to;
 718         if (strlen($refer) > 2) {
 719             $refer .= ' ' . $message_id;
 720         } else {
 721             if ($in_reply_to) {
 722                 $refer .= $in_reply_to . ' ' . $message_id;
 723             } else {
 724                 $refer .= $message_id;
 725             }
 726         }
 727         trim($refer);
 728         return $refer;
 729     }
 730
 731     /**
 732      * Converts ip address to hexadecimal string
 733      *
 734      * Function is used to convert ipv4 and ipv6 addresses to hex strings.
 735      * It removes all delimiter symbols from ip addresses, converts decimal
 736      * ipv4 numbers to hex and pads strings in order to present full length
 737      * address. ipv4 addresses are represented as 8 byte strings, ipv6 addresses
 738      * are represented as 32 byte string.
 739      *
 740      * If function fails to detect address format, it returns unprocessed string.
 741      * @param string $string ip address string
 742      * @return string processed ip address string
 743      * @since 1.5.1 and 1.4.5
 744      */
 745     function ip2hex($string) {
 746         if (preg_match("/^(\d+)\.(\d+)\.(\d+)\.(\d+)$/",$string,$match)) {
 747             // ipv4 address
 748             $ret = str_pad(dechex($match[1]),2,'0',STR_PAD_LEFT)
 749                 . str_pad(dechex($match[2]),2,'0',STR_PAD_LEFT)
 750                 . str_pad(dechex($match[3]),2,'0',STR_PAD_LEFT)
 751                 . str_pad(dechex($match[4]),2,'0',STR_PAD_LEFT);
 752         } elseif (preg_match("/^([0-9a-h]+)\:([0-9a-h]+)\:([0-9a-h]+)\:([0-9a-h]+)\:([0-9a-h]+)\:([0-9a-h]+)\:([0-9a-h]+)\:([0-9a-h]+)$/i",$string,$match)) {
 753             // full ipv6 address
 754             $ret = str_pad($match[1],4,'0',STR_PAD_LEFT)
 755                 . str_pad($match[2],4,'0',STR_PAD_LEFT)
 756                 . str_pad($match[3],4,'0',STR_PAD_LEFT)
 757                 . str_pad($match[4],4,'0',STR_PAD_LEFT)
 758                 . str_pad($match[5],4,'0',STR_PAD_LEFT)
 759                 . str_pad($match[6],4,'0',STR_PAD_LEFT)
 760                 . str_pad($match[7],4,'0',STR_PAD_LEFT)
 761                 . str_pad($match[8],4,'0',STR_PAD_LEFT);
 762         } elseif (preg_match("/^\:\:([0-9a-h\:]+)$/i",$string,$match)) {
 763             // short ipv6 with all starting symbols nulled
 764             $aAddr=explode(':',$match[1]);
 765             $ret='';
 766             foreach ($aAddr as $addr) {
 767                 $ret.=str_pad($addr,4,'0',STR_PAD_LEFT);
 768             }
 769             $ret=str_pad($ret,32,'0',STR_PAD_LEFT);
 770         } elseif (preg_match("/^([0-9a-h\:]+)::([0-9a-h\:]+)$/i",$string,$match)) {
 771             // short ipv6 with middle part nulled
 772             $aStart=explode(':',$match[1]);
 773             $sStart='';
 774             foreach($aStart as $addr) {
 775                 $sStart.=str_pad($addr,4,'0',STR_PAD_LEFT);
 776             }
 777             $aEnd = explode(':',$match[2]);
 778             $sEnd='';
 779             foreach($aEnd as $addr) {
 780                 $sEnd.=str_pad($addr,4,'0',STR_PAD_LEFT);
 781             }
 782             $ret = $sStart
 783                 . str_pad('',(32 - strlen($sStart . $sEnd)),'0',STR_PAD_LEFT)
 784                 . $sEnd;
 785         } else {
 786             // unknown addressing
 787             $ret = $string;
 788         }
 789         return $ret;
 790     }
 791 }
 792 ?>