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