lib/functions.php

   1 <?php
   2 /*
   3  *  Jirafeau, your web file repository
   4  *  Copyright (C) 2008  Julien "axolotl" BERNARD <axolotl@magieeternelle.org>
   5  *  Copyright (C) 2015  Jerome Jutteau <j.jutteau@gmail.com>
   6  *  Copyright (C) 2015  Nicola Spanti (RyDroid) <dev@nicola-spanti.info>
   7  *
   8  *  This program is free software: you can redistribute it and/or modify
   9  *  it under the terms of the GNU Affero General Public License as
  10  *  published by the Free Software Foundation, either version 3 of the
  11  *  License, or (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU Affero General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU Affero General Public License
  19  *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
  20  */
  21
  22 /**
  23  * Transform a string in a path by seperating each letters by a '/'.
  24  * @return path finishing with a '/'
  25  */
  26 function s2p($s)
  27 {
  28     $p = '';
  29     for ($i = 0; $i < strlen($s); $i++) {
  30         $p .= $s{$i} . '/';
  31     }
  32     return $p;
  33 }
  34
  35 /**
  36  * Convert base 16 to base 64
  37  * @returns A string based on 64 characters (0-9, a-z, A-Z, "-" and "_")
  38  */
  39 function base_16_to_64($num)
  40 {
  41     $m = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_';
  42     $hex2bin = array('0000',  # 0
  43                       '0001',  # 1
  44                       '0010',  # 2
  45                       '0011',  # 3
  46                       '0100',  # 4
  47                       '0101',  # 5
  48                       '0110',  # 6
  49                       '0111',  # 7
  50                       '1000',  # 8
  51                       '1001',  # 9
  52                       '1010',  # a
  53                       '1011',  # b
  54                       '1100',  # c
  55                       '1101',  # d
  56                       '1110',  # e
  57                       '1111'); # f
  58     $o = '';
  59     $b = '';
  60     $i = 0;
  61     # Convert long hex string to bin.
  62     $size = strlen($num);
  63     for ($i = 0; $i < $size; $i++) {
  64         $b .= $hex2bin{hexdec($num{$i})};
  65     }
  66     # Convert long bin to base 64.
  67     $size *= 4;
  68     for ($i = $size - 6; $i >= 0; $i -= 6) {
  69         $o = $m{bindec(substr($b, $i, 6))} . $o;
  70     }
  71     # Some few bits remaining ?
  72     if ($i < 0 && $i > -6) {
  73         $o = $m{bindec(substr($b, 0, $i + 6))} . $o;
  74     }
  75     return $o;
  76 }
  77
  78 /**
  79   * Generate a random code.
  80   * @param $l code length
  81   * @return  random code.
  82   */
  83 function jirafeau_gen_random($l)
  84 {
  85     if ($l <= 0) {
  86         return 42;
  87     }
  88
  89     $code="";
  90     for ($i = 0; $i < $l; $i++) {
  91         $code .= dechex(rand(0, 15));
  92     }
  93
  94     return $code;
  95 }
  96
  97 function is_ssl()
  98 {
  99     if (isset($_SERVER['HTTPS'])) {
 100         if ('on' == strtolower($_SERVER['HTTPS']) ||
 101              '1' == $_SERVER['HTTPS']) {
 102             return true;
 103         }
 104     } elseif (isset($_SERVER['SERVER_PORT']) && ('443' == $_SERVER['SERVER_PORT'])) {
 105         return true;
 106     } elseif (isset($_SERVER['HTTP_X_FORWARDED_PROTO'])) {
 107         if ($_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https') {
 108             return true;
 109         }
 110     }
 111     return false;
 112 }
 113
 114 function jirafeau_human_size($octets)
 115 {
 116     $u = array('B', 'KB', 'MB', 'GB', 'TB');
 117     $o = max($octets, 0);
 118     $p = min(floor(($o ? log($o) : 0) / log(1024)), count($u) - 1);
 119     $o /= pow(1024, $p);
 120     return round($o, 1) . $u[$p];
 121 }
 122
 123 function jirafeau_clean_rm_link($link)
 124 {
 125     $p = s2p("$link");
 126     if (file_exists(VAR_LINKS . $p . $link)) {
 127         unlink(VAR_LINKS . $p . $link);
 128     }
 129     $parse = VAR_LINKS . $p;
 130     $scan = array();
 131     while (file_exists($parse)
 132            && ($scan = scandir($parse))
 133            && count($scan) == 2 // '.' and '..' folders => empty.
 134            && basename($parse) != basename(VAR_LINKS)) {
 135         rmdir($parse);
 136         $parse = substr($parse, 0, strlen($parse) - strlen(basename($parse)) - 1);
 137     }
 138 }
 139
 140 function jirafeau_clean_rm_file($md5)
 141 {
 142     $p = s2p("$md5");
 143     $f = VAR_FILES . $p . $md5;
 144     if (file_exists($f) && is_file($f)) {
 145         unlink($f);
 146     }
 147     if (file_exists($f . '_count') && is_file($f . '_count')) {
 148         unlink($f . '_count');
 149     }
 150     $parse = VAR_FILES . $p;
 151     $scan = array();
 152     while (file_exists($parse)
 153            && ($scan = scandir($parse))
 154            && count($scan) == 2 // '.' and '..' folders => empty.
 155            && basename($parse) != basename(VAR_FILES)) {
 156         rmdir($parse);
 157         $parse = substr($parse, 0, strlen($parse) - strlen(basename($parse)) - 1);
 158     }
 159 }
 160
 161 /**
 162  * transforms a php.ini string representing a value in an integer
 163  * @param $value the value from php.ini
 164  * @returns an integer for this value
 165  */
 166 function jirafeau_ini_to_bytes($value)
 167 {
 168     $modifier = substr($value, -1);
 169     $bytes = substr($value, 0, -1);
 170     switch (strtoupper($modifier)) {
 171     case 'P':
 172         $bytes *= 1024;
 173     case 'T':
 174         $bytes *= 1024;
 175     case 'G':
 176         $bytes *= 1024;
 177     case 'M':
 178         $bytes *= 1024;
 179     case 'K':
 180         $bytes *= 1024;
 181     }
 182     return $bytes;
 183 }
 184
 185 /**
 186  * gets the maximum upload size according to php.ini
 187  * @returns the maximum upload size in bytes
 188  */
 189 function jirafeau_get_max_upload_size_bytes()
 190 {
 191     return min(jirafeau_ini_to_bytes(ini_get('post_max_size')),
 192                 jirafeau_ini_to_bytes(ini_get('upload_max_filesize')));
 193 }
 194
 195 /**
 196  * gets the maximum upload size according to php.ini
 197  * @returns the maximum upload size string
 198  */
 199 function jirafeau_get_max_upload_size()
 200 {
 201     return jirafeau_human_size(
 202             min(jirafeau_ini_to_bytes(ini_get('post_max_size')),
 203                  jirafeau_ini_to_bytes(ini_get('upload_max_filesize'))));
 204 }
 205
 206 /**
 207  * gets a string explaining the error
 208  * @param $code the error code
 209  * @returns a string explaining the error
 210  */
 211 function jirafeau_upload_errstr($code)
 212 {
 213     switch ($code) {
 214     case UPLOAD_ERR_INI_SIZE:
 215     case UPLOAD_ERR_FORM_SIZE:
 216         return t('Your file exceeds the maximum authorized file size. ');
 217
 218     case UPLOAD_ERR_PARTIAL:
 219     case UPLOAD_ERR_NO_FILE:
 220         return
 221             t('Your file was not uploaded correctly. You may succeed in retrying. ');
 222
 223     case UPLOAD_ERR_NO_TMP_DIR:
 224     case UPLOAD_ERR_CANT_WRITE:
 225     case UPLOAD_ERR_EXTENSION:
 226         return t('Internal error. You may not succeed in retrying. ');
 227     }
 228     return t('Unknown error. ');
 229 }
 230
 231 /** Remove link and it's file
 232  * @param $link the link's name (hash)
 233  */
 234
 235 function jirafeau_delete_link($link)
 236 {
 237     $l = jirafeau_get_link($link);
 238     if (!count($l)) {
 239         return;
 240     }
 241
 242     jirafeau_clean_rm_link($link);
 243
 244     $md5 = $l['md5'];
 245     $p = s2p("$md5");
 246
 247     $counter = 1;
 248     if (file_exists(VAR_FILES . $p . $md5. '_count')) {
 249         $content = file(VAR_FILES . $p . $md5. '_count');
 250         $counter = trim($content[0]);
 251     }
 252     $counter--;
 253
 254     if ($counter >= 1) {
 255         $handle = fopen(VAR_FILES . $p . $md5. '_count', 'w');
 256         fwrite($handle, $counter);
 257         fclose($handle);
 258     }
 259
 260     if ($counter == 0) {
 261         jirafeau_clean_rm_file($md5);
 262     }
 263 }
 264
 265 /**
 266  * Delete a file and it's links.
 267  */
 268 function jirafeau_delete_file($md5)
 269 {
 270     $count = 0;
 271     /* Get all links files. */
 272     $stack = array(VAR_LINKS);
 273     while (($d = array_shift($stack)) && $d != null) {
 274         $dir = scandir($d);
 275
 276         foreach ($dir as $node) {
 277             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 278                 preg_match('/\.tmp/i', "$node")) {
 279                 continue;
 280             }
 281
 282             if (is_dir($d . $node)) {
 283                 /* Push new found directory. */
 284                 $stack[] = $d . $node . '/';
 285             } elseif (is_file($d . $node)) {
 286                 /* Read link informations. */
 287                 $l = jirafeau_get_link(basename($node));
 288                 if (!count($l)) {
 289                     continue;
 290                 }
 291                 if ($l['md5'] == $md5) {
 292                     $count++;
 293                     jirafeau_delete_link($node);
 294                 }
 295             }
 296         }
 297     }
 298     jirafeau_clean_rm_file($md5);
 299     return $count;
 300 }
 301
 302 /**
 303  * handles an uploaded file
 304  * @param $file the file struct given by $_FILE[]
 305  * @param $one_time_download is the file a one time download ?
 306  * @param $key if not empty, protect the file with this key
 307  * @param $time the time of validity of the file
 308  * @param $ip uploader's ip
 309  * @param $crypt boolean asking to crypt or not
 310  * @param $link_name_length size of the link name
 311  * @returns an array containing some information
 312  *   'error' => information on possible errors
 313  *   'link' => the link name of the uploaded file
 314  *   'delete_link' => the link code to delete file
 315  */
 316 function jirafeau_upload($file, $one_time_download, $key, $time, $ip, $crypt, $link_name_length)
 317 {
 318     if (empty($file['tmp_name']) || !is_uploaded_file($file['tmp_name'])) {
 319         return (array(
 320                  'error' =>
 321                    array('has_error' => true,
 322                           'why' => jirafeau_upload_errstr($file['error'])),
 323                  'link' => '',
 324                  'delete_link' => ''));
 325     }
 326
 327     /* array representing no error */
 328     $noerr = array('has_error' => false, 'why' => '');
 329
 330     /* Crypt file if option is enabled. */
 331     $crypted = false;
 332     $crypt_key = '';
 333     if ($crypt == true && !(extension_loaded('mcrypt') == true)) {
 334         error_log("PHP extension mcrypt not loaded, won't encrypt in Jirafeau");
 335     }
 336     if ($crypt == true && extension_loaded('mcrypt') == true) {
 337         $crypt_key = jirafeau_encrypt_file($file['tmp_name'], $file['tmp_name']);
 338         if (strlen($crypt_key) > 0) {
 339             $crypted = true;
 340         }
 341     }
 342
 343     /* file informations */
 344     $md5 = md5_file($file['tmp_name']);
 345     $name = str_replace(NL, '', trim($file['name']));
 346     $mime_type = $file['type'];
 347     $size = $file['size'];
 348
 349     /* does file already exist ? */
 350     $rc = false;
 351     $p = s2p("$md5");
 352     if (file_exists(VAR_FILES . $p .  $md5)) {
 353         $rc = unlink($file['tmp_name']);
 354     } elseif ((file_exists(VAR_FILES . $p) || @mkdir(VAR_FILES . $p, 0755, true))
 355             && move_uploaded_file($file['tmp_name'], VAR_FILES . $p . $md5)) {
 356         $rc = true;
 357     }
 358     if (!$rc) {
 359         return (array(
 360                  'error' =>
 361                    array('has_error' => true,
 362                           'why' => t('Internal error during file creation.')),
 363                  'link' =>'',
 364                  'delete_link' => ''));
 365     }
 366
 367     /* Increment or create count file. */
 368     $counter = 0;
 369     if (file_exists(VAR_FILES . $p . $md5 . '_count')) {
 370         $content = file(VAR_FILES . $p . $md5. '_count');
 371         $counter = trim($content[0]);
 372     }
 373     $counter++;
 374     $handle = fopen(VAR_FILES . $p . $md5. '_count', 'w');
 375     fwrite($handle, $counter);
 376     fclose($handle);
 377
 378     /* Create delete code. */
 379     $delete_link_code = jirafeau_gen_random(5);
 380
 381     /* md5 password or empty. */
 382     $password = '';
 383     if (!empty($key)) {
 384         $password = md5($key);
 385     }
 386
 387     /* create link file */
 388     $link_tmp_name =  VAR_LINKS . $md5 . rand(0, 10000) . '.tmp';
 389     $handle = fopen($link_tmp_name, 'w');
 390     fwrite($handle,
 391             $name . NL. $mime_type . NL. $size . NL. $password . NL. $time .
 392             NL . $md5. NL . ($one_time_download ? 'O' : 'R') . NL . time() .
 393             NL . $ip . NL. $delete_link_code . NL . ($crypted ? 'C' : 'O'));
 394     fclose($handle);
 395     $md5_link = substr(base_16_to_64(md5_file($link_tmp_name)), 0, $link_name_length);
 396     $l = s2p("$md5_link");
 397     if (!@mkdir(VAR_LINKS . $l, 0755, true) ||
 398         !rename($link_tmp_name, VAR_LINKS . $l . $md5_link)) {
 399         if (file_exists($link_tmp_name)) {
 400             unlink($link_tmp_name);
 401         }
 402
 403         $counter--;
 404         if ($counter >= 1) {
 405             $handle = fopen(VAR_FILES . $p . $md5. '_count', 'w');
 406             fwrite($handle, $counter);
 407             fclose($handle);
 408         } else {
 409             jirafeau_clean_rm_file($md5_link);
 410         }
 411         return array(
 412                  'error' =>
 413                    array('has_error' => true,
 414                           'why' => t('Internal error during file creation. ')),
 415                  'link' =>'',
 416                  'delete_link' => '');
 417     }
 418     return array( 'error' => $noerr,
 419                   'link' => $md5_link,
 420                   'delete_link' => $delete_link_code,
 421                   'crypt_key' => $crypt_key);
 422 }
 423
 424 /**
 425  * Tells if a mime-type is viewable in a browser
 426  * @param $mime the mime type
 427  * @returns a boolean telling if a mime type is viewable
 428  */
 429 function jirafeau_is_viewable($mime)
 430 {
 431     if (!empty($mime)) {
 432         /* Actually, verify if mime-type is an image or a text. */
 433         $viewable = array('image', 'text', 'video', 'audio');
 434         $decomposed = explode('/', $mime);
 435         return in_array($decomposed[0], $viewable);
 436     }
 437     return false;
 438 }
 439
 440 // Error handling functions.
 441 //! Global array that contains all registered errors.
 442 $error_list = array();
 443
 444 /**
 445  * Adds an error to the list of errors.
 446  * @param $title the error's title
 447  * @param $description is a human-friendly description of the problem.
 448  */
 449 function add_error($title, $description)
 450 {
 451     global $error_list;
 452     $error_list[] = '<p>' . $title. '<br />' . $description. '</p>';
 453 }
 454
 455 /**
 456  * Informs whether any error has been registered yet.
 457  * @return true if there are errors.
 458  */
 459 function has_error()
 460 {
 461     global $error_list;
 462     return !empty($error_list);
 463 }
 464
 465 /**
 466  * Displays all the errors.
 467  */
 468 function show_errors()
 469 {
 470     if (has_error()) {
 471         global $error_list;
 472         echo '<div class="error">';
 473         foreach ($error_list as $error) {
 474             echo $error;
 475         }
 476         echo '</div>';
 477     }
 478 }
 479
 480 function check_errors($cfg)
 481 {
 482     if (file_exists(JIRAFEAU_ROOT . 'install.php')
 483         && !($cfg['installation_done'] === true)) {
 484         header('Location: install.php');
 485         exit;
 486     }
 487
 488     /* check if the destination dirs are writable */
 489     $writable = is_writable(VAR_FILES) && is_writable(VAR_LINKS);
 490
 491     /* Checking for errors. */
 492     if (!is_writable(VAR_FILES)) {
 493         add_error(t('The file directory is not writable!'), VAR_FILES);
 494     }
 495
 496     if (!is_writable(VAR_LINKS)) {
 497         add_error(t('The link directory is not writable!'), VAR_LINKS);
 498     }
 499
 500     if (!is_writable(VAR_ASYNC)) {
 501         add_error(t('The async directory is not writable!'), VAR_ASYNC);
 502     }
 503 }
 504
 505 /**
 506  * Read link informations
 507  * @return array containing informations.
 508  */
 509 function jirafeau_get_link($hash)
 510 {
 511     $out = array();
 512     $link = VAR_LINKS . s2p("$hash") . $hash;
 513
 514     if (!file_exists($link)) {
 515         return $out;
 516     }
 517
 518     $c = file($link);
 519     $out['file_name'] = trim($c[0]);
 520     $out['mime_type'] = trim($c[1]);
 521     $out['file_size'] = trim($c[2]);
 522     $out['key'] = trim($c[3], NL);
 523     $out['time'] = trim($c[4]);
 524     $out['md5'] = trim($c[5]);
 525     $out['onetime'] = trim($c[6]);
 526     $out['upload_date'] = trim($c[7]);
 527     $out['ip'] = trim($c[8]);
 528     $out['link_code'] = trim($c[9]);
 529     $out['crypted'] = trim($c[10]) == 'C';
 530
 531     return $out;
 532 }
 533
 534 /**
 535  * List files in admin interface.
 536  */
 537 function jirafeau_admin_list($name, $file_hash, $link_hash)
 538 {
 539     echo '<fieldset><legend>';
 540     if (!empty($name)) {
 541         echo t('Filename') . ": $name ";
 542     }
 543     if (!empty($file_hash)) {
 544         echo t('file') . ": $file_hash ";
 545     }
 546     if (!empty($link_hash)) {
 547         echo t('link') . ": $link_hash ";
 548     }
 549     if (empty($name) && empty($file_hash) && empty($link_hash)) {
 550         echo t('List all files');
 551     }
 552     echo '</legend>';
 553     echo '<table>';
 554     echo '<tr>';
 555     echo '<td>' . t('Filename') . '</td>';
 556     echo '<td>' . t('Type') . '</td>';
 557     echo '<td>' . t('Size') . '</td>';
 558     echo '<td>' . t('Expire') . '</td>';
 559     echo '<td>' . t('Onetime') . '</td>';
 560     echo '<td>' . t('Upload date') . '</td>';
 561     echo '<td>' . t('Origin') . '</td>';
 562     echo '<td>' . t('Action') . '</td>';
 563     echo '</tr>';
 564
 565     /* Get all links files. */
 566     $stack = array(VAR_LINKS);
 567     while (($d = array_shift($stack)) && $d != null) {
 568         $dir = scandir($d);
 569         foreach ($dir as $node) {
 570             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 571                 preg_match('/\.tmp/i', "$node")) {
 572                 continue;
 573             }
 574             if (is_dir($d . $node)) {
 575                 /* Push new found directory. */
 576                 $stack[] = $d . $node . '/';
 577             } elseif (is_file($d . $node)) {
 578                 /* Read link informations. */
 579                 $l = jirafeau_get_link($node);
 580                 if (!count($l)) {
 581                     continue;
 582                 }
 583
 584                 /* Filter. */
 585                 if (!empty($name) && !preg_match("/$name/i", htmlspecialchars($l['file_name']))) {
 586                     continue;
 587                 }
 588                 if (!empty($file_hash) && $file_hash != $l['md5']) {
 589                     continue;
 590                 }
 591                 if (!empty($link_hash) && $link_hash != $node) {
 592                     continue;
 593                 }
 594                 /* Print link informations. */
 595                 echo '<tr>';
 596                 echo '<td>' .
 597                 '<strong><a id="upload_link" href="/f.php?h='. htmlspecialchars($node) .'" title="' .
 598                     t('Download page') . '">' . htmlspecialchars($l['file_name']) . '</a></strong>';
 599                 echo '</td>';
 600                 echo '<td>' . $l['mime_type'] . '</td>';
 601                 echo '<td>' . jirafeau_human_size($l['file_size']) . '</td>';
 602                 echo '<td>' . ($l['time'] == -1 ? '' : strftime('%c', $l['time'])) .
 603                      '</td>';
 604                 echo '<td>';
 605                 if ($l['onetime'] == 'O') {
 606                     echo 'Y';
 607                 } else {
 608                     echo 'N';
 609                 }
 610                 echo '</td>';
 611                 echo '<td>' . strftime('%c', $l['upload_date']) . '</td>';
 612                 echo '<td>' . $l['ip'] . '</td>';
 613                 echo '<td>' .
 614                 '<form method="post">' .
 615                 '<input type = "hidden" name = "action" value = "download"/>' .
 616                 '<input type = "hidden" name = "link" value = "' . $node . '"/>' .
 617                 '<input type = "submit" value = "' . t('Download') . '" />' .
 618                 '</form>' .
 619                 '<form method="post">' .
 620                 '<input type = "hidden" name = "action" value = "delete_link"/>' .
 621                 '<input type = "hidden" name = "link" value = "' . $node . '"/>' .
 622                 '<input type = "submit" value = "' . t('Del link') . '" />' .
 623                 '</form>' .
 624                 '<form method="post">' .
 625                 '<input type = "hidden" name = "action" value = "delete_file"/>' .
 626                 '<input type = "hidden" name = "md5" value = "' . $l['md5'] . '"/>' .
 627                 '<input type = "submit" value = "' . t('Del file and links') . '" />' .
 628                 '</form>' .
 629                 '</td>';
 630                 echo '</tr>';
 631             }
 632         }
 633     }
 634     echo '</table></fieldset>';
 635 }
 636
 637 /**
 638  * Clean expired files.
 639  * @return number of cleaned files.
 640  */
 641 function jirafeau_admin_clean()
 642 {
 643     $count = 0;
 644     /* Get all links files. */
 645     $stack = array(VAR_LINKS);
 646     while (($d = array_shift($stack)) && $d != null) {
 647         $dir = scandir($d);
 648
 649         foreach ($dir as $node) {
 650             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 651                 preg_match('/\.tmp/i', "$node")) {
 652                 continue;
 653             }
 654
 655             if (is_dir($d . $node)) {
 656                 /* Push new found directory. */
 657                 $stack[] = $d . $node . '/';
 658             } elseif (is_file($d . $node)) {
 659                 /* Read link informations. */
 660                 $l = jirafeau_get_link(basename($node));
 661                 if (!count($l)) {
 662                     continue;
 663                 }
 664                 $p = s2p($l['md5']);
 665                 if ($l['time'] > 0 && $l['time'] < time() || // expired
 666                     !file_exists(VAR_FILES . $p . $l['md5']) || // invalid
 667                     !file_exists(VAR_FILES . $p . $l['md5'] . '_count')) { // invalid
 668                     jirafeau_delete_link($node);
 669                     $count++;
 670                 }
 671             }
 672         }
 673     }
 674     return $count;
 675 }
 676
 677
 678 /**
 679  * Clean old async transferts.
 680  * @return number of cleaned files.
 681  */
 682 function jirafeau_admin_clean_async()
 683 {
 684     $count = 0;
 685     /* Get all links files. */
 686     $stack = array(VAR_ASYNC);
 687     while (($d = array_shift($stack)) && $d != null) {
 688         $dir = scandir($d);
 689
 690         foreach ($dir as $node) {
 691             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 692                 preg_match('/\.tmp/i', "$node")) {
 693                 continue;
 694             }
 695
 696             if (is_dir($d . $node)) {
 697                 /* Push new found directory. */
 698                 $stack[] = $d . $node . '/';
 699             } elseif (is_file($d . $node)) {
 700                 /* Read async informations. */
 701                 $a = jirafeau_get_async_ref(basename($node));
 702                 if (!count($a)) {
 703                     continue;
 704                 }
 705                 /* Delete transferts older than 1 hour. */
 706                 if (time() - $a['last_edited'] > 3600) {
 707                     jirafeau_async_delete(basename($node));
 708                     $count++;
 709                 }
 710             }
 711         }
 712     }
 713     return $count;
 714 }
 715 /**
 716  * Read async transfert informations
 717  * @return array containing informations.
 718  */
 719 function jirafeau_get_async_ref($ref)
 720 {
 721     $out = array();
 722     $refinfos = VAR_ASYNC . s2p("$ref") . "$ref";
 723
 724     if (!file_exists($refinfos)) {
 725         return $out;
 726     }
 727
 728     $c = file($refinfos);
 729     $out['file_name'] = trim($c[0]);
 730     $out['mime_type'] = trim($c[1]);
 731     $out['key'] = trim($c[2], NL);
 732     $out['time'] = trim($c[3]);
 733     $out['onetime'] = trim($c[4]);
 734     $out['ip'] = trim($c[5]);
 735     $out['last_edited'] = trim($c[6]);
 736     $out['next_code'] = trim($c[7]);
 737     return $out;
 738 }
 739
 740 /**
 741  * Delete async transfert informations
 742  */
 743 function jirafeau_async_delete($ref)
 744 {
 745     $p = s2p("$ref");
 746     if (file_exists(VAR_ASYNC . $p . $ref)) {
 747         unlink(VAR_ASYNC . $p . $ref);
 748     }
 749     if (file_exists(VAR_ASYNC . $p . $ref . '_data')) {
 750         unlink(VAR_ASYNC . $p . $ref . '_data');
 751     }
 752     $parse = VAR_ASYNC . $p;
 753     $scan = array();
 754     while (file_exists($parse)
 755            && ($scan = scandir($parse))
 756            && count($scan) == 2 // '.' and '..' folders => empty.
 757            && basename($parse) != basename(VAR_ASYNC)) {
 758         rmdir($parse);
 759         $parse = substr($parse, 0, strlen($parse) - strlen(basename($parse)) - 1);
 760     }
 761 }
 762
 763 /**
 764   * Init a new asynchronous upload.
 765   * @param $finename Name of the file to send
 766   * @param $one_time One time upload parameter
 767   * @param $key eventual password (or blank)
 768   * @param $time time limit
 769   * @param $ip ip address of the client
 770   * @return a string containing a temporary reference followed by a code or the string 'Error'
 771   */
 772 function jirafeau_async_init($filename, $type, $one_time, $key, $time, $ip)
 773 {
 774     $res = 'Error';
 775
 776     /* Create temporary folder. */
 777     $ref;
 778     $p;
 779     $code = jirafeau_gen_random(4);
 780     do {
 781         $ref = jirafeau_gen_random(32);
 782         $p = VAR_ASYNC . s2p($ref);
 783     } while (file_exists($p));
 784     @mkdir($p, 0755, true);
 785     if (!file_exists($p)) {
 786         echo 'Error';
 787         return;
 788     }
 789
 790     /* md5 password or empty */
 791     $password = '';
 792     if (!empty($key)) {
 793         $password = md5($key);
 794     }
 795
 796     /* Store informations. */
 797     $p .= $ref;
 798     $handle = fopen($p, 'w');
 799     fwrite($handle,
 800             str_replace(NL, '', trim($filename)) . NL .
 801             str_replace(NL, '', trim($type)) . NL . $password . NL .
 802             $time . NL . ($one_time ? 'O' : 'R') . NL . $ip . NL .
 803             time() . NL . $code . NL);
 804     fclose($handle);
 805
 806     return $ref . NL . $code ;
 807 }
 808
 809 /**
 810   * Append a piece of file on the asynchronous upload.
 811   * @param $ref asynchronous upload reference
 812   * @param $file piece of data
 813   * @param $code client code for this operation
 814   * @param $max_file_size maximum allowed file size
 815   * @return a string containing a next code to use or the string "Error"
 816   */
 817 function jirafeau_async_push($ref, $data, $code, $max_file_size)
 818 {
 819     /* Get async infos. */
 820     $a = jirafeau_get_async_ref($ref);
 821
 822     /* Check some errors. */
 823     if (count($a) == 0
 824         || $a['next_code'] != "$code"
 825         || empty($data['tmp_name'])
 826         || !is_uploaded_file($data['tmp_name'])) {
 827         return 'Error';
 828     }
 829
 830     $p = s2p($ref);
 831
 832     /* File path. */
 833     $r_path = $data['tmp_name'];
 834     $w_path = VAR_ASYNC . $p . $ref . '_data';
 835
 836     /* Check that file size is not above upload limit. */
 837     if ($max_file_size > 0 &&
 838         filesize($r_path) + filesize($w_path) > $max_file_size * 1024 * 1024) {
 839         jirafeau_async_delete($ref);
 840         return 'Error';
 841     }
 842
 843     /* Concatenate data. */
 844     $r = fopen($r_path, 'r');
 845     $w = fopen($w_path, 'a');
 846     while (!feof($r)) {
 847         if (fwrite($w, fread($r, 1024)) === false) {
 848             fclose($r);
 849             fclose($w);
 850             jirafeau_async_delete($ref);
 851             return 'Error';
 852         }
 853     }
 854     fclose($r);
 855     fclose($w);
 856     unlink($r_path);
 857
 858     /* Update async file. */
 859     $code = jirafeau_gen_random(4);
 860     $handle = fopen(VAR_ASYNC . $p . $ref, 'w');
 861     fwrite($handle,
 862             $a['file_name'] . NL. $a['mime_type'] . NL. $a['key'] . NL .
 863             $a['time'] . NL . $a['onetime'] . NL . $a['ip'] . NL .
 864             time() . NL . $code . NL);
 865     fclose($handle);
 866     return $code;
 867 }
 868
 869 /**
 870   * Finalyze an asynchronous upload.
 871   * @param $ref asynchronous upload reference
 872   * @param $code client code for this operation
 873   * @param $crypt boolean asking to crypt or not
 874   * @param $link_name_length link name length
 875   * @return a string containing the download reference followed by a delete code or the string 'Error'
 876   */
 877 function jirafeau_async_end($ref, $code, $crypt, $link_name_length)
 878 {
 879     /* Get async infos. */
 880     $a = jirafeau_get_async_ref($ref);
 881     if (count($a) == 0
 882         || $a['next_code'] != "$code") {
 883         return "Error";
 884     }
 885
 886     /* Generate link infos. */
 887     $p = VAR_ASYNC . s2p($ref) . $ref . "_data";
 888     if (!file_exists($p)) {
 889         return 'Error';
 890     }
 891
 892     $crypted = false;
 893     $crypt_key = '';
 894     if ($crypt == true && extension_loaded('mcrypt') == true) {
 895         $crypt_key = jirafeau_encrypt_file($p, $p);
 896         if (strlen($crypt_key) > 0) {
 897             $crypted = true;
 898         }
 899     }
 900
 901     $md5 = md5_file($p);
 902     $size = filesize($p);
 903     $np = s2p($md5);
 904     $delete_link_code = jirafeau_gen_random(5);
 905
 906     /* File already exist ? */
 907     if (!file_exists(VAR_FILES . $np)) {
 908         @mkdir(VAR_FILES . $np, 0755, true);
 909     }
 910     if (!file_exists(VAR_FILES . $np . $md5)) {
 911         rename($p, VAR_FILES . $np . $md5);
 912     }
 913
 914     /* Increment or create count file. */
 915     $counter = 0;
 916     if (file_exists(VAR_FILES . $np . $md5 . '_count')) {
 917         $content = file(VAR_FILES . $np . $md5. '_count');
 918         $counter = trim($content[0]);
 919     }
 920     $counter++;
 921     $handle = fopen(VAR_FILES . $np . $md5. '_count', 'w');
 922     fwrite($handle, $counter);
 923     fclose($handle);
 924
 925     /* Create link. */
 926     $link_tmp_name =  VAR_LINKS . $md5 . rand(0, 10000) . '.tmp';
 927     $handle = fopen($link_tmp_name, 'w');
 928     fwrite($handle,
 929             $a['file_name'] . NL . $a['mime_type'] . NL . $size . NL .
 930             $a['key'] . NL . $a['time'] . NL . $md5 . NL . $a['onetime'] . NL .
 931             time() . NL . $a['ip'] . NL . $delete_link_code . NL . ($crypted ? 'C' : 'O'));
 932     fclose($handle);
 933     $md5_link = substr(base_16_to_64(md5_file($link_tmp_name)), 0, $link_name_length);
 934     $l = s2p("$md5_link");
 935     if (!@mkdir(VAR_LINKS . $l, 0755, true) ||
 936         !rename($link_tmp_name, VAR_LINKS . $l . $md5_link)) {
 937         echo "Error";
 938     }
 939
 940     /* Clean async upload. */
 941     jirafeau_async_delete($ref);
 942     return $md5_link . NL . $delete_link_code . NL . urlencode($crypt_key);
 943 }
 944
 945 function jirafeau_crypt_create_iv($base, $size)
 946 {
 947     $iv = '';
 948     while (strlen($iv) < $size) {
 949         $iv = $iv . $base;
 950     }
 951     $iv = substr($iv, 0, $size);
 952     return $iv;
 953 }
 954
 955 /**
 956  * Crypt file and returns decrypt key.
 957  * @param $fp_src file path to the file to crypt.
 958  * @param $fp_dst file path to the file to write crypted file (could be the same).
 959  * @return decrypt key composed of the key and the iv separated by a point ('.')
 960  */
 961 function jirafeau_encrypt_file($fp_src, $fp_dst)
 962 {
 963     $fs = filesize($fp_src);
 964     if ($fs === false || $fs == 0 || !(extension_loaded('mcrypt') == true)) {
 965         return '';
 966     }
 967
 968     /* Prepare module. */
 969     $m = mcrypt_module_open('rijndael-256', '', 'ofb', '');
 970     /* Generate key. */
 971     $crypt_key = jirafeau_gen_random(10);
 972     $md5_key = md5($crypt_key);
 973     $iv = jirafeau_crypt_create_iv($md5_key, mcrypt_enc_get_iv_size($m));
 974     /* Init module. */
 975     mcrypt_generic_init($m, $md5_key, $iv);
 976     /* Crypt file. */
 977     $r = fopen($fp_src, 'r');
 978     $w = fopen($fp_dst, 'c');
 979     while (!feof($r)) {
 980         $enc = mcrypt_generic($m, fread($r, 1024));
 981         if (fwrite($w, $enc) === false) {
 982             return '';
 983         }
 984     }
 985     fclose($r);
 986     fclose($w);
 987     /* Cleanup. */
 988     mcrypt_generic_deinit($m);
 989     mcrypt_module_close($m);
 990     return $crypt_key;
 991 }
 992
 993 /**
 994  * Decrypt file.
 995  * @param $fp_src file path to the file to decrypt.
 996  * @param $fp_dst file path to the file to write decrypted file (could be the same).
 997  * @param $k string composed of the key and the iv separated by a point ('.')
 998  * @return key used to decrypt. a string of length 0 is returned if failed.
 999  */
1000 function jirafeau_decrypt_file($fp_src, $fp_dst, $k)
1001 {
1002     $fs = filesize($fp_src);
1003     if ($fs === false || $fs == 0 || extension_loaded('mcrypt') == false) {
1004         return false;
1005     }
1006
1007     /* Init module */
1008     $m = mcrypt_module_open('rijndael-256', '', 'ofb', '');
1009     /* Extract key and iv. */
1010     $crypt_key = $k;
1011     $md5_key = md5($crypt_key);
1012     $iv = jirafeau_crypt_create_iv($md5_key, mcrypt_enc_get_iv_size($m));
1013     /* Decrypt file. */
1014     $r = fopen($fp_src, 'r');
1015     $w = fopen($fp_dst, 'c');
1016     while (!feof($r)) {
1017         $dec = mdecrypt_generic($m, fread($r, 1024));
1018         if (fwrite($w, $dec) === false) {
1019             return false;
1020         }
1021     }
1022     fclose($r);
1023     fclose($w);
1024     /* Cleanup. */
1025     mcrypt_generic_deinit($m);
1026     mcrypt_module_close($m);
1027     return true;
1028 }
1029
1030 /**
1031  * Check if Jirafeau is password protected for visitors.
1032  * @return true if Jirafeau is password protected, false otherwise.
1033  */
1034 function jirafeau_has_upload_password($cfg)
1035 {
1036     return count($cfg['upload_password']) > 0;
1037 }
1038
1039 /**
1040  * Challenge password for a visitor.
1041  * @param $password password to be challenged
1042  * @return true if password is valid, false otherwise.
1043  */
1044 function jirafeau_challenge_upload_password($cfg, $password)
1045 {
1046     if (!jirafeau_has_upload_password($cfg)) {
1047         return false;
1048     }
1049     foreach ($cfg['upload_password'] as $p) {
1050         if ($password == $p) {
1051             return true;
1052         }
1053     }
1054     return false;
1055 }
1056
1057 /**
1058  * Test if visitor's IP is authorized to upload.
1059  * @param $ip IP to be challenged
1060  * @return true if IP is authorized, false otherwise.
1061  */
1062 function jirafeau_challenge_upload_ip($cfg, $ip)
1063 {
1064     if (count($cfg['upload_ip']) == 0) {
1065         return true;
1066     }
1067     foreach ($cfg['upload_ip'] as $i) {
1068         if ($i == $ip) {
1069             return true;
1070         }
1071         // CIDR test for IPv4 only.
1072         if (strpos($i, '/') !== false) {
1073             list($subnet, $mask) = explode('/', $i);
1074             if ((ip2long($ip) & ~((1 << (32 - $mask)) - 1)) == ip2long($subnet)) {
1075                 return true;
1076             }
1077         }
1078     }
1079     return false;
1080 }
1081
1082 /**
1083  * Test if visitor's IP is authorized or password is supplied and authorized
1084  * @param $ip IP to be challenged
1085  * @param $password password to be challenged
1086  * @return true if access is valid, false otherwise.
1087  */
1088 function jirafeau_challenge_upload ($cfg, $ip, $password)
1089 {
1090     // Allow if no ip restrictaion and no password restriction
1091     if ((count ($cfg['upload_ip']) == 0) and (count ($cfg['upload_password']) == 0)) {
1092         return true;
1093     }
1094
1095     // Allow if ip is in array
1096     foreach ($cfg['upload_ip'] as $i) {
1097         if ($i == $ip) {
1098             return true;
1099         }
1100         // CIDR test for IPv4 only.
1101         if (strpos ($i, '/') !== false)
1102         {
1103             list ($subnet, $mask) = explode('/', $i);
1104             if ((ip2long ($ip) & ~((1 << (32 - $mask)) - 1) ) == ip2long ($subnet)) {
1105                 return true;
1106             }
1107         }
1108     }
1109     if (!jirafeau_has_upload_password($cfg)) {
1110         return false;
1111     }
1112
1113     foreach ($cfg['upload_password'] as $p) {
1114         if ($password == $p) {
1115             return true;
1116         }
1117     }
1118     return false;
1119 }
1120
1121 /** Tell if we have some HTTP headers generated by a proxy */
1122 function has_http_forwarded()
1123 {
1124     return
1125         !empty($_SERVER['HTTP_X_FORWARDED_FOR']) ||
1126         !empty($_SERVER['http_X_forwarded_for']);
1127 }
1128
1129 /**
1130  * Generate IP list from HTTP headers generated by a proxy
1131  * @return  array of IP strings
1132  */
1133 function get_ip_list_http_forwarded()
1134 {
1135     $ip_list = array();
1136     if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
1137         $l = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
1138         if ($l === false) {
1139             return array();
1140         }
1141         foreach ($l as $ip) {
1142             array_push($ip_list, preg_replace('/\s+/', '', $ip));
1143         }
1144     }
1145     if (!empty($_SERVER['http_X_forwarded_for'])) {
1146         $l = explode(',', $_SERVER['http_X_forwarded_for']);
1147         foreach ($l as $ip) {
1148             // Separate IP from port
1149             $ipa = explode(':', $ip);
1150             if ($ipa === false) {
1151                 continue;
1152             }
1153             $ip = $ipa[0];
1154             array_push($ip_list, preg_replace('/\s+/', '', $ip));
1155         }
1156     }
1157     return $ip_list;
1158 }
1159
1160 /**
1161  * Get the ip address of the client from REMOTE_ADDR
1162  * or from HTTP_X_FORWARDED_FOR if behind a proxy
1163  * @returns the client ip address
1164  */
1165 function get_ip_address($cfg)
1166 {
1167     $remote = $_SERVER['REMOTE_ADDR'];
1168     if (count($cfg['proxy_ip']) == 0 || !has_http_forwarded()) {
1169         return $remote;
1170     }
1171
1172     $ip_list = get_ip_list_http_forwarded();
1173     if (count($ip_list) == 0) {
1174         return $remote;
1175     }
1176
1177     foreach ($cfg['proxy_ip'] as $proxy_ip) {
1178         if ($remote != $proxy_ip) {
1179             continue;
1180         }
1181         // Take the last IP (the one which has been set by the defined proxy).
1182         return end($ip_list);
1183     }
1184     return $remote;
1185 }
1186
1187 /**
1188  * Convert hexadecimal string to base64
1189  */
1190 function hex_to_base64($hex)
1191 {
1192     $b = '';
1193     foreach (str_split($hex, 2) as $pair) {
1194         $b .= chr(hexdec($pair));
1195     }
1196     return base64_encode($b);
1197 }
1198
1199 /**
1200  * Read alias informations
1201  * @return array containing informations.
1202  */
1203 function jirafeau_get_alias($hash)
1204 {
1205     $out = array();
1206     $link = VAR_ALIAS . s2p("$hash") . $hash;
1207
1208     if (!file_exists($link)) {
1209         return $out;
1210     }
1211
1212     $c = file($link);
1213     $out['md5_password'] = trim($c[0]);
1214     $out['ip'] = trim($c[1]);
1215     $out['update_date'] = trim($c[2]);
1216     $out['destination'] = trim($c[3], NL);
1217
1218     return $out;
1219 }
1220
1221 /** Create an alias to a jirafeau's link.
1222  * @param $alias alias name
1223  * @param $destination reference of the destination
1224  * @param $password password to protect alias
1225  * @param $ip client's IP
1226  * @return  a string containing the edit code of the alias or the string "Error"
1227  */
1228 function jirafeau_alias_create($alias, $destination, $password, $ip)
1229 {
1230     /* Check that alias and password are long enough. */
1231     if (strlen($alias) < 8 ||
1232         strlen($alias) > 32 ||
1233         strlen($password) < 8 ||
1234         strlen($password) > 32) {
1235         return 'Error';
1236     }
1237
1238     /* Check that destination exists. */
1239     $l = jirafeau_get_link($destination);
1240     if (!count($l)) {
1241         return 'Error';
1242     }
1243
1244     /* Check that alias does not already exists. */
1245     $alias = md5($alias);
1246     $p = VAR_ALIAS . s2p($alias);
1247     if (file_exists($p)) {
1248         return 'Error';
1249     }
1250
1251     /* Create alias folder. */
1252     @mkdir($p, 0755, true);
1253     if (!file_exists($p)) {
1254         return 'Error';
1255     }
1256
1257     /* Generate password. */
1258     $md5_password = md5($password);
1259
1260     /* Store informations. */
1261     $p .= $alias;
1262     $handle = fopen($p, 'w');
1263     fwrite($handle,
1264             $md5_password . NL .
1265             $ip . NL .
1266             time() . NL .
1267             $destination . NL);
1268     fclose($handle);
1269
1270     return 'Ok';
1271 }
1272
1273 /** Update an alias.
1274  * @param $alias alias to update
1275  * @param $destination reference of the new destination
1276  * @param $password password to protect alias
1277  * @param $new_password optional new password to protect alias
1278  * @param $ip client's IP
1279  * @return "Ok" or "Error" string
1280  */
1281 function jirafeau_alias_update($alias, $destination, $password,
1282                        $new_password, $ip)
1283 {
1284     $alias = md5($alias);
1285     /* Check that alias exits. */
1286     $a = jirafeau_get_alias($alias);
1287     if (!count($a)) {
1288         return 'Error';
1289     }
1290
1291     /* Check that destination exists. */
1292     $l = jirafeau_get_link($a["destination"]);
1293     if (!count($l)) {
1294         return 'Error';
1295     }
1296
1297     /* Check password. */
1298     if ($a["md5_password"] != md5($password)) {
1299         return 'Error';
1300     }
1301
1302     $p = $a['md5_password'];
1303     if (strlen($new_password) >= 8 &&
1304         strlen($new_password) <= 32) {
1305         $p = md5($new_password);
1306     } elseif (strlen($new_password) > 0) {
1307         return 'Error';
1308     }
1309
1310     /* Rewrite informations. */
1311     $p = VAR_ALIAS . s2p($alias) . $alias;
1312     $handle = fopen($p, 'w');
1313     fwrite($handle,
1314             $p . NL .
1315             $ip . NL .
1316             time() . NL .
1317             $destination . NL);
1318     fclose($handle);
1319     return 'Ok';
1320 }
1321
1322 /** Get an alias.
1323  * @param $alias alias to get
1324  * @return alias destination or "Error" string
1325  */
1326 function jirafeau_alias_get($alias)
1327 {
1328     $alias = md5($alias);
1329     /* Check that alias exits. */
1330     $a = jirafeau_get_alias($alias);
1331     if (!count($a)) {
1332         return 'Error';
1333     }
1334
1335     return $a['destination'];
1336 }
1337
1338 function jirafeau_clean_rm_alias($alias)
1339 {
1340     $p = s2p("$alias");
1341     if (file_exists(VAR_ALIAS . $p . $alias)) {
1342         unlink(VAR_ALIAS . $p . $alias);
1343     }
1344     $parse = VAR_ALIAS . $p;
1345     $scan = array();
1346     while (file_exists($parse)
1347            && ($scan = scandir($parse))
1348            && count($scan) == 2 // '.' and '..' folders => empty.
1349            && basename($parse) != basename(VAR_ALIAS)) {
1350         rmdir($parse);
1351         $parse = substr($parse, 0, strlen($parse) - strlen(basename($parse)) - 1);
1352     }
1353 }
1354
1355 /** Delete an alias.
1356  * @param $alias alias to delete
1357  * @param $password password to protect alias
1358  * @return "Ok" or "Error" string
1359  */
1360 function jirafeau_alias_delete($alias, $password)
1361 {
1362     $alias = md5($alias);
1363     /* Check that alias exits. */
1364     $a = jirafeau_get_alias($alias);
1365     if (!count($a)) {
1366         return "Error";
1367     }
1368
1369     /* Check password. */
1370     if ($a["md5_password"] != md5($password)) {
1371         return 'Error';
1372     }
1373
1374     jirafeau_clean_rm_alias($alias);
1375     return 'Ok';
1376 }
1377
1378 /**
1379  * Replace markers in templates.
1380  *
1381  * Available markers have the scheme "###MARKERNAME###".
1382  *
1383  * @param $content string Template text with markers
1384  * @param $htmllinebreaks boolean Convert linebreaks to BR-Tags
1385  * @return Template with replaced markers
1386  */
1387 function jirafeau_replace_markers($content, $htmllinebreaks = false)
1388 {
1389     $patterns = array(
1390         '/###ORGANISATION###/',
1391         '/###CONTACTPERSON###/',
1392         '/###WEBROOT###/'
1393     );
1394     $replacements = array(
1395         $GLOBALS['cfg']['organisation'],
1396         $GLOBALS['cfg']['contactperson'],
1397         $GLOBALS['cfg']['web_root']
1398     );
1399     $content = preg_replace($patterns, $replacements, $content);
1400
1401     if (true === $htmllinebreaks) {
1402         $content = nl2br($content);
1403     }
1404
1405     return $content;
1406 }