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 . time () .
 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 != $node)
 612                     continue;
 613                 /* Print link informations. */
 614                 echo '<tr>';
 615                 echo '<td>' .
 616                 '<strong><a id="upload_link" href="/f.php?h='. htmlspecialchars($node) .'" title="' .
 617                     t('Download page') . '">' . htmlspecialchars($l['file_name']) . '</a></strong>';
 618                 echo '</td>';
 619                 echo '<td>' . $l['mime_type'] . '</td>';
 620                 echo '<td>' . jirafeau_human_size ($l['file_size']) . '</td>';
 621                 echo '<td>' . ($l['time'] == -1 ? '' : strftime ('%c', $l['time'])) .
 622                      '</td>';
 623                 echo '<td>';
 624                 if ($l['onetime'] == 'O')
 625                     echo 'Y';
 626                 else
 627                     echo 'N';
 628                 echo '</td>';
 629                 echo '<td>' . strftime ('%c', $l['upload_date']) . '</td>';
 630                 echo '<td>' . $l['ip'] . '</td>';
 631                 echo '<td>' .
 632                 '<form action = "admin.php" method = "post">' .
 633                 '<input type = "hidden" name = "action" value = "download"/>' .
 634                 '<input type = "hidden" name = "link" value = "' . $node . '"/>' .
 635                 '<input type = "submit" value = "' . t('Download') . '" />' .
 636                 '</form>' .
 637                 '<form action = "admin.php" method = "post">' .
 638                 '<input type = "hidden" name = "action" value = "delete_link"/>' .
 639                 '<input type = "hidden" name = "link" value = "' . $node . '"/>' .
 640                 '<input type = "submit" value = "' . t('Del link') . '" />' .
 641                 '</form>' .
 642                 '<form action = "admin.php" method = "post">' .
 643                 '<input type = "hidden" name = "action" value = "delete_file"/>' .
 644                 '<input type = "hidden" name = "md5" value = "' . $l['md5'] . '"/>' .
 645                 '<input type = "submit" value = "' . t('Del file and links') . '" />' .
 646                 '</form>' .
 647                 '</td>';
 648                 echo '</tr>';
 649             }
 650         }
 651     }
 652     echo '</table></fieldset>';
 653 }
 654
 655 /**
 656  * Clean expired files.
 657  * @return number of cleaned files.
 658  */
 659 function
 660 jirafeau_admin_clean ()
 661 {
 662     $count = 0;
 663     /* Get all links files. */
 664     $stack = array (VAR_LINKS);
 665     while (($d = array_shift ($stack)) && $d != NULL)
 666     {
 667         $dir = scandir ($d);
 668
 669         foreach ($dir as $node)
 670         {
 671             if (strcmp ($node, '.') == 0 || strcmp ($node, '..') == 0 ||
 672                 preg_match ('/\.tmp/i', "$node"))
 673                 continue;
 674
 675             if (is_dir ($d . $node))
 676             {
 677                 /* Push new found directory. */
 678                 $stack[] = $d . $node . '/';
 679             }
 680             elseif (is_file ($d . $node))
 681             {
 682                 /* Read link informations. */
 683                 $l = jirafeau_get_link (basename ($node));
 684                 if (!count ($l))
 685                     continue;
 686                 $p = s2p ($l['md5']);
 687                 if ($l['time'] > 0 && $l['time'] < time () || // expired
 688                     !file_exists (VAR_FILES . $p . $l['md5']) || // invalid
 689                     !file_exists (VAR_FILES . $p . $l['md5'] . '_count')) // invalid
 690                 {
 691                     jirafeau_delete_link ($node);
 692                     $count++;
 693                 }
 694             }
 695         }
 696     }
 697     return $count;
 698 }
 699
 700
 701 /**
 702  * Clean old async transferts.
 703  * @return number of cleaned files.
 704  */
 705 function
 706 jirafeau_admin_clean_async ()
 707 {
 708     $count = 0;
 709     /* Get all links files. */
 710     $stack = array (VAR_ASYNC);
 711     while (($d = array_shift ($stack)) && $d != NULL)
 712     {
 713         $dir = scandir ($d);
 714
 715         foreach ($dir as $node)
 716         {
 717             if (strcmp ($node, '.') == 0 || strcmp ($node, '..') == 0 ||
 718                 preg_match ('/\.tmp/i', "$node"))
 719                 continue;
 720
 721             if (is_dir ($d . $node))
 722             {
 723                 /* Push new found directory. */
 724                 $stack[] = $d . $node . '/';
 725             }
 726             elseif (is_file ($d . $node))
 727             {
 728                 /* Read async informations. */
 729                 $a = jirafeau_get_async_ref (basename ($node));
 730                 if (!count ($a))
 731                     continue;
 732                 /* Delete transferts older than 1 hour. */
 733                 if (time () - $a['last_edited'] > 3600)
 734                 {
 735                     jirafeau_async_delete (basename ($node));
 736                     $count++;
 737                 }
 738             }
 739         }
 740     }
 741     return $count;
 742 }
 743 /**
 744  * Read async transfert informations
 745  * @return array containing informations.
 746  */
 747 function
 748 jirafeau_get_async_ref ($ref)
 749 {
 750     $out = array ();
 751     $refinfos = VAR_ASYNC . s2p ("$ref") . "$ref";
 752
 753     if (!file_exists ($refinfos))
 754         return $out;
 755
 756     $c = file ($refinfos);
 757     $out['file_name'] = trim ($c[0]);
 758     $out['mime_type'] = trim ($c[1]);
 759     $out['key'] = trim ($c[2], NL);
 760     $out['time'] = trim ($c[3]);
 761     $out['onetime'] = trim ($c[4]);
 762     $out['ip'] = trim ($c[5]);
 763     $out['last_edited'] = trim ($c[6]);
 764     $out['next_code'] = trim ($c[7]);
 765     return $out;
 766 }
 767
 768 /**
 769  * Delete async transfert informations
 770  */
 771 function
 772 jirafeau_async_delete ($ref)
 773 {
 774     $p = s2p ("$ref");
 775     if (file_exists (VAR_ASYNC . $p . $ref))
 776         unlink (VAR_ASYNC . $p . $ref);
 777     if (file_exists (VAR_ASYNC . $p . $ref . '_data'))
 778         unlink (VAR_ASYNC . $p . $ref . '_data');
 779     $parse = VAR_ASYNC . $p;
 780     $scan = array();
 781     while (file_exists ($parse)
 782            && ($scan = scandir ($parse))
 783            && count ($scan) == 2 // '.' and '..' folders => empty.
 784            && basename ($parse) != basename (VAR_ASYNC))
 785     {
 786         rmdir ($parse);
 787         $parse = substr ($parse, 0, strlen($parse) - strlen(basename ($parse)) - 1);
 788     }
 789 }
 790
 791 /**
 792   * Init a new asynchronous upload.
 793   * @param $finename Name of the file to send
 794   * @param $one_time One time upload parameter
 795   * @param $key eventual password (or blank)
 796   * @param $time time limit
 797   * @param $ip ip address of the client
 798   * @return a string containing a temporary reference followed by a code or the string 'Error'
 799   */
 800 function
 801 jirafeau_async_init ($filename, $type, $one_time, $key, $time, $ip)
 802 {
 803     $res = 'Error';
 804
 805     /* Create temporary folder. */
 806     $ref;
 807     $p;
 808     $code = jirafeau_gen_random (4);
 809     do
 810     {
 811         $ref = jirafeau_gen_random (32);
 812         $p = VAR_ASYNC . s2p ($ref);
 813     } while (file_exists ($p));
 814     @mkdir ($p, 0755, true);
 815     if (!file_exists ($p))
 816     {
 817         echo 'Error';
 818         return;
 819     }
 820
 821     /* md5 password or empty */
 822     $password = '';
 823     if (!empty ($key))
 824         $password = md5 ($key);
 825
 826     /* Store informations. */
 827     $p .= $ref;
 828     $handle = fopen ($p, 'w');
 829     fwrite ($handle,
 830             str_replace (NL, '', trim ($filename)) . NL .
 831             str_replace (NL, '', trim ($type)) . NL . $password . NL .
 832             $time . NL . ($one_time ? 'O' : 'R') . NL . $ip . NL .
 833             time () . NL . $code . NL);
 834     fclose ($handle);
 835
 836     return $ref . NL . $code ;
 837 }
 838
 839 /**
 840   * Append a piece of file on the asynchronous upload.
 841   * @param $ref asynchronous upload reference
 842   * @param $file piece of data
 843   * @param $code client code for this operation
 844   * @param $max_file_size maximum allowed file size
 845   * @return a string containing a next code to use or the string "Error"
 846   */
 847 function
 848 jirafeau_async_push ($ref, $data, $code, $max_file_size)
 849 {
 850     /* Get async infos. */
 851     $a = jirafeau_get_async_ref ($ref);
 852
 853     /* Check some errors. */
 854     if (count ($a) == 0
 855         || $a['next_code'] != "$code"
 856         || empty ($data['tmp_name'])
 857         || !is_uploaded_file ($data['tmp_name']))
 858         return 'Error';
 859
 860     $p = s2p ($ref);
 861
 862     /* File path. */
 863     $r_path = $data['tmp_name'];
 864     $w_path = VAR_ASYNC . $p . $ref . '_data';
 865
 866     /* Check that file size is not above upload limit. */
 867     if ($max_file_size > 0 &&
 868         filesize ($r_path) + filesize ($w_path) > $max_file_size * 1024 * 1024)
 869     {
 870         jirafeau_async_delete ($ref);
 871         return 'Error';
 872     }
 873
 874     /* Concatenate data. */
 875     $r = fopen ($r_path, 'r');
 876     $w = fopen ($w_path, 'a');
 877     while (!feof ($r))
 878     {
 879         if (fwrite ($w, fread ($r, 1024)) === false)
 880         {
 881             fclose ($r);
 882             fclose ($w);
 883             jirafeau_async_delete ($ref);
 884             return 'Error';
 885         }
 886     }
 887     fclose ($r);
 888     fclose ($w);
 889     unlink ($r_path);
 890
 891     /* Update async file. */
 892     $code = jirafeau_gen_random (4);
 893     $handle = fopen (VAR_ASYNC . $p . $ref, 'w');
 894     fwrite ($handle,
 895             $a['file_name'] . NL. $a['mime_type'] . NL. $a['key'] . NL .
 896             $a['time'] . NL . $a['onetime'] . NL . $a['ip'] . NL .
 897             time () . NL . $code . NL);
 898     fclose ($handle);
 899     return $code;
 900 }
 901
 902 /**
 903   * Finalyze an asynchronous upload.
 904   * @param $ref asynchronous upload reference
 905   * @param $code client code for this operation
 906   * @param $crypt boolean asking to crypt or not
 907   * @param $link_name_length link name length
 908   * @return a string containing the download reference followed by a delete code or the string 'Error'
 909   */
 910 function
 911 jirafeau_async_end ($ref, $code, $crypt, $link_name_length)
 912 {
 913     /* Get async infos. */
 914     $a = jirafeau_get_async_ref ($ref);
 915     if (count ($a) == 0
 916         || $a['next_code'] != "$code")
 917         return "Error";
 918
 919     /* Generate link infos. */
 920     $p = VAR_ASYNC . s2p ($ref) . $ref . "_data";
 921     if (!file_exists($p))
 922         return 'Error';
 923
 924     $crypted = false;
 925     $crypt_key = '';
 926     if ($crypt == true && extension_loaded('mcrypt') == true)
 927     {
 928         $crypt_key = jirafeau_encrypt_file ($p, $p);
 929         if (strlen($crypt_key) > 0)
 930             $crypted = true;
 931     }
 932
 933     $md5 = md5_file ($p);
 934     $size = filesize($p);
 935     $np = s2p ($md5);
 936     $delete_link_code = jirafeau_gen_random (5);
 937
 938     /* File already exist ? */
 939     if (!file_exists (VAR_FILES . $np))
 940         @mkdir (VAR_FILES . $np, 0755, true);
 941     if (!file_exists (VAR_FILES . $np . $md5))
 942         rename ($p, VAR_FILES . $np . $md5);
 943
 944     /* Increment or create count file. */
 945     $counter = 0;
 946     if (file_exists (VAR_FILES . $np . $md5 . '_count'))
 947     {
 948         $content = file (VAR_FILES . $np . $md5. '_count');
 949         $counter = trim ($content[0]);
 950     }
 951     $counter++;
 952     $handle = fopen (VAR_FILES . $np . $md5. '_count', 'w');
 953     fwrite ($handle, $counter);
 954     fclose ($handle);
 955
 956     /* Create link. */
 957     $link_tmp_name =  VAR_LINKS . $md5 . rand (0, 10000) . '.tmp';
 958     $handle = fopen ($link_tmp_name, 'w');
 959     fwrite ($handle,
 960             $a['file_name'] . NL . $a['mime_type'] . NL . $size . NL .
 961             $a['key'] . NL . $a['time'] . NL . $md5 . NL . $a['onetime'] . NL .
 962             time () . NL . $a['ip'] . NL . $delete_link_code . NL . ($crypted ? 'C' : 'O'));
 963     fclose ($handle);
 964     $md5_link = substr(base_16_to_64 (md5_file ($link_tmp_name)), 0, $link_name_length);
 965     $l = s2p ("$md5_link");
 966     if (!@mkdir (VAR_LINKS . $l, 0755, true) ||
 967         !rename ($link_tmp_name,  VAR_LINKS . $l . $md5_link))
 968         echo "Error";
 969
 970     /* Clean async upload. */
 971     jirafeau_async_delete ($ref);
 972     return $md5_link . NL . $delete_link_code . NL . urlencode($crypt_key);
 973 }
 974
 975 function
 976 jirafeau_crypt_create_iv($base, $size)
 977 {
 978     $iv = '';
 979     while (strlen ($iv) < $size)
 980         $iv = $iv . $base;
 981     $iv = substr($iv, 0, $size);
 982     return $iv;
 983 }
 984
 985 /**
 986  * Crypt file and returns decrypt key.
 987  * @param $fp_src file path to the file to crypt.
 988  * @param $fp_dst file path to the file to write crypted file (could be the same).
 989  * @return decrypt key composed of the key and the iv separated by a point ('.')
 990  */
 991 function
 992 jirafeau_encrypt_file ($fp_src, $fp_dst)
 993 {
 994     $fs = filesize ($fp_src);
 995     if ($fs === false || $fs == 0 || !(extension_loaded('mcrypt') == true))
 996         return '';
 997
 998     /* Prepare module. */
 999     $m = mcrypt_module_open('rijndael-256', '', 'ofb', '');
1000     /* Generate key. */
1001     $crypt_key = jirafeau_gen_random (10);
1002     $md5_key = md5($crypt_key);
1003     $iv = jirafeau_crypt_create_iv ($md5_key, mcrypt_enc_get_iv_size($m));
1004     /* Init module. */
1005     mcrypt_generic_init($m, $md5_key, $iv);
1006     /* Crypt file. */
1007     $r = fopen ($fp_src, 'r');
1008     $w = fopen ($fp_dst, 'c');
1009     while (!feof ($r))
1010     {
1011         $enc = mcrypt_generic($m, fread ($r, 1024));
1012         if (fwrite ($w, $enc) === false)
1013             return '';
1014     }
1015     fclose ($r);
1016     fclose ($w);
1017     /* Cleanup. */
1018     mcrypt_generic_deinit($m);
1019     mcrypt_module_close($m);
1020     return $crypt_key;
1021 }
1022
1023 /**
1024  * Decrypt file.
1025  * @param $fp_src file path to the file to decrypt.
1026  * @param $fp_dst file path to the file to write decrypted file (could be the same).
1027  * @param $k string composed of the key and the iv separated by a point ('.')
1028  * @return key used to decrypt. a string of length 0 is returned if failed.
1029  */
1030 function
1031 jirafeau_decrypt_file ($fp_src, $fp_dst, $k)
1032 {
1033     $fs = filesize ($fp_src);
1034     if ($fs === false || $fs == 0 || extension_loaded('mcrypt') == false)
1035         return false;
1036
1037     /* Init module */
1038     $m = mcrypt_module_open('rijndael-256', '', 'ofb', '');
1039     /* Extract key and iv. */
1040     $crypt_key = $k;
1041     $md5_key = md5($crypt_key);
1042     $iv = jirafeau_crypt_create_iv ($md5_key, mcrypt_enc_get_iv_size($m));
1043     /* Decrypt file. */
1044     $r = fopen ($fp_src, 'r');
1045     $w = fopen ($fp_dst, 'c');
1046     while (!feof ($r))
1047     {
1048         $dec = mdecrypt_generic($m, fread ($r, 1024));
1049         if (fwrite ($w, $dec) === false)
1050             return false;
1051     }
1052     fclose ($r);
1053     fclose ($w);
1054     /* Cleanup. */
1055     mcrypt_generic_deinit($m);
1056     mcrypt_module_close($m);
1057     return true;
1058 }
1059
1060 /**
1061  * Check if Jirafeau is password protected for visitors.
1062  * @return true if Jirafeau is password protected, false otherwise.
1063  */
1064 function
1065 jirafeau_has_upload_password ($cfg)
1066 {
1067     return count ($cfg['upload_password']) > 0;
1068 }
1069
1070 /**
1071  * Challenge password for a visitor.
1072  * @param $password password to be challenged
1073  * @return true if password is valid, false otherwise.
1074  */
1075 function
1076 jirafeau_challenge_upload_password ($cfg, $password)
1077 {
1078     if (!jirafeau_has_upload_password($cfg))
1079         return false;
1080     forEach ($cfg['upload_password'] as $p)
1081         if ($password == $p)
1082             return true;
1083     return false;
1084 }
1085
1086 /**
1087  * Test if visitor's IP is authorized to upload.
1088  * @param $ip IP to be challenged
1089  * @return true if IP is authorized, false otherwise.
1090  */
1091 function
1092 jirafeau_challenge_upload_ip ($cfg, $ip)
1093 {
1094     if (count ($cfg['upload_ip']) == 0)
1095         return true;
1096     forEach ($cfg['upload_ip'] as $i)
1097     {
1098         if ($i == $ip)
1099             return true;
1100         // CIDR test for IPv4 only.
1101         if (strpos ($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     return false;
1109 }
1110
1111 /** Tell if we have some HTTP headers generated by a proxy */
1112 function
1113 has_http_forwarded()
1114 {
1115     return
1116         !empty ($_SERVER['HTTP_X_FORWARDED_FOR']) ||
1117         !empty ($_SERVER['http_X_forwarded_for']);
1118 }
1119
1120 /**
1121  * Generate IP list from HTTP headers generated by a proxy
1122  * @return  array of IP strings
1123  */
1124 function
1125 get_ip_list_http_forwarded()
1126 {
1127     $ip_list = array();
1128     if (!empty ($_SERVER['HTTP_X_FORWARDED_FOR']))
1129     {
1130         $l = explode (',', $_SERVER['HTTP_X_FORWARDED_FOR']);
1131         if ($l === FALSE)
1132             return array();
1133         foreach ($l as $ip)
1134             array_push ($ip_list, preg_replace ('/\s+/', '', $ip));
1135     }
1136     if (!empty ($_SERVER['http_X_forwarded_for']))
1137     {
1138         $l = explode (',', $_SERVER['http_X_forwarded_for']);
1139         foreach ($l as $ip)
1140         {
1141             // Separate IP from port
1142             $ipa = explode (':', $ip);
1143             if ($ipa === FALSE)
1144                 continue;
1145             $ip = $ipa[0];
1146             array_push ($ip_list, preg_replace ('/\s+/', '', $ip));
1147         }
1148     }
1149     return $ip_list;
1150 }
1151
1152 /**
1153  * Get the ip address of the client from REMOTE_ADDR
1154  * or from HTTP_X_FORWARDED_FOR if behind a proxy
1155  * @returns the client ip address
1156  */
1157 function
1158 get_ip_address($cfg)
1159 {
1160     $remote = $_SERVER['REMOTE_ADDR'];
1161     if (count ($cfg['proxy_ip']) == 0 || !has_http_forwarded ())
1162         return $remote;
1163
1164     $ip_list = get_ip_list_http_forwarded ();
1165     if (count ($ip_list) == 0)
1166         return $remote;
1167
1168     foreach ($cfg['proxy_ip'] as $proxy_ip)
1169     {
1170         if ($remote != $proxy_ip)
1171             continue;
1172         // Take the last IP (the one which has been set by the defined proxy).
1173         return end ($ip_list);
1174     }
1175     return $remote;
1176 }
1177
1178 /**
1179  * Convert hexadecimal string to base64
1180  */
1181 function hex_to_base64($hex)
1182 {
1183     $b = '';
1184     foreach (str_split ($hex, 2) as $pair)
1185         $b .= chr (hexdec ($pair));
1186     return base64_encode ($b);
1187 }
1188
1189 /**
1190  * Read alias informations
1191  * @return array containing informations.
1192  */
1193 function
1194 jirafeau_get_alias ($hash)
1195 {
1196     $out = array ();
1197     $link = VAR_ALIAS . s2p ("$hash") . $hash;
1198
1199     if (!file_exists ($link))
1200         return $out;
1201
1202     $c = file ($link);
1203     $out['md5_password'] = trim ($c[0]);
1204     $out['ip'] = trim ($c[1]);
1205     $out['update_date'] = trim ($c[2]);
1206     $out['destination'] = trim ($c[3], NL);
1207
1208     return $out;
1209 }
1210
1211 /** Create an alias to a jirafeau's link.
1212  * @param $alias alias name
1213  * @param $destination reference of the destination
1214  * @param $password password to protect alias
1215  * @param $ip client's IP
1216  * @return  a string containing the edit code of the alias or the string "Error"
1217  */
1218 function
1219 jirafeau_alias_create ($alias, $destination, $password, $ip)
1220 {
1221     /* Check that alias and password are long enough. */
1222     if (strlen ($alias) < 8 ||
1223         strlen ($alias) > 32 ||
1224         strlen ($password) < 8 ||
1225         strlen ($password) > 32)
1226         return 'Error';
1227
1228     /* Check that destination exists. */
1229     $l = jirafeau_get_link ($destination);
1230     if (!count ($l))
1231         return 'Error';
1232
1233     /* Check that alias does not already exists. */
1234     $alias = md5 ($alias);
1235     $p = VAR_ALIAS . s2p ($alias);
1236     if (file_exists ($p))
1237         return 'Error';
1238
1239     /* Create alias folder. */
1240     @mkdir ($p, 0755, true);
1241     if (!file_exists ($p))
1242         return 'Error';
1243
1244     /* Generate password. */
1245     $md5_password = md5 ($password);
1246
1247     /* Store informations. */
1248     $p .= $alias;
1249     $handle = fopen ($p, 'w');
1250     fwrite ($handle,
1251             $md5_password . NL .
1252             $ip . NL .
1253             time () . NL .
1254             $destination . NL);
1255     fclose ($handle);
1256
1257     return 'Ok';
1258 }
1259
1260 /** Update an alias.
1261  * @param $alias alias to update
1262  * @param $destination reference of the new destination
1263  * @param $password password to protect alias
1264  * @param $new_password optional new password to protect alias
1265  * @param $ip client's IP
1266  * @return "Ok" or "Error" string
1267  */
1268 function
1269 jirafeau_alias_update ($alias, $destination, $password,
1270                        $new_password, $ip)
1271 {
1272     $alias = md5 ($alias);
1273     /* Check that alias exits. */
1274     $a = jirafeau_get_alias ($alias);
1275     if (!count ($a))
1276         return 'Error';
1277
1278     /* Check that destination exists. */
1279     $l = jirafeau_get_link ($a["destination"]);
1280     if (!count ($l))
1281         return 'Error';
1282
1283     /* Check password. */
1284     if ($a["md5_password"] != md5 ($password))
1285         return 'Error';
1286
1287     $p = $a['md5_password'];
1288     if (strlen ($new_password) >= 8 &&
1289         strlen ($new_password) <= 32)
1290         $p = md5 ($new_password);
1291     else if (strlen ($new_password) > 0)
1292         return 'Error';
1293
1294     /* Rewrite informations. */
1295     $p = VAR_ALIAS . s2p ($alias) . $alias;
1296     $handle = fopen ($p, 'w');
1297     fwrite ($handle,
1298             $p . NL .
1299             $ip . NL .
1300             time () . NL .
1301             $destination . NL);
1302     fclose ($handle);
1303     return 'Ok';
1304 }
1305
1306 /** Get an alias.
1307  * @param $alias alias to get
1308  * @return alias destination or "Error" string
1309  */
1310 function
1311 jirafeau_alias_get ($alias)
1312 {
1313     $alias = md5 ($alias);
1314     /* Check that alias exits. */
1315     $a = jirafeau_get_alias ($alias);
1316     if (!count ($a))
1317         return 'Error';
1318
1319     return $a['destination'];
1320 }
1321
1322 function
1323 jirafeau_clean_rm_alias ($alias)
1324 {
1325     $p = s2p ("$alias");
1326     if (file_exists (VAR_ALIAS . $p . $alias))
1327         unlink (VAR_ALIAS . $p . $alias);
1328     $parse = VAR_ALIAS . $p;
1329     $scan = array();
1330     while (file_exists ($parse)
1331            && ($scan = scandir ($parse))
1332            && count ($scan) == 2 // '.' and '..' folders => empty.
1333            && basename ($parse) != basename (VAR_ALIAS))
1334     {
1335         rmdir ($parse);
1336         $parse = substr ($parse, 0, strlen($parse) - strlen(basename ($parse)) - 1);
1337     }
1338 }
1339
1340 /** Delete an alias.
1341  * @param $alias alias to delete
1342  * @param $password password to protect alias
1343  * @return "Ok" or "Error" string
1344  */
1345 function
1346 jirafeau_alias_delete ($alias, $password)
1347 {
1348     $alias = md5 ($alias);
1349     /* Check that alias exits. */
1350     $a = jirafeau_get_alias ($alias);
1351     if (!count ($a))
1352         return "Error";
1353
1354     /* Check password. */
1355     if ($a["md5_password"] != md5 ($password))
1356         return 'Error';
1357
1358     jirafeau_clean_rm_alias ($alias);
1359     return 'Ok';
1360 }
1361