mod/dfrn_poll.php

   1 <?php
   2
   3 /**
   4  * @file mod/dfrn_poll.php
   5  */
   6 use Friendica\App;
   7 use Friendica\Core\Config;
   8 use Friendica\Core\L10n;
   9 use Friendica\Core\System;
  10 use Friendica\Database\DBM;
  11 use Friendica\Module\Login;
  12 use Friendica\Protocol\DFRN;
  13 use Friendica\Protocol\OStatus;
  14 use Friendica\Util\Network;
  15
  16 require_once 'include/items.php';
  17
  18 function dfrn_poll_init(App $a)
  19 {
  20         Login::sessionAuth();
  21
  22         $dfrn_id         = defaults($_GET, 'dfrn_id'        , '');
  23         $type            = defaults($_GET, 'type'           , 'data');
  24         $last_update     = defaults($_GET, 'last_update'    , '');
  25         $destination_url = defaults($_GET, 'destination_url', '');
  26         $challenge       = defaults($_GET, 'challenge'      , '');
  27         $sec             = defaults($_GET, 'sec'            , '');
  28         $dfrn_version    = (float) defaults($_GET, 'dfrn_version'   , 2.0);
  29         $perm            = defaults($_GET, 'perm'           , 'r');
  30         $quiet                   = x($_GET, 'quiet');
  31
  32         // Possibly it is an OStatus compatible server that requests a user feed
  33         if (($a->argc > 1) && ($dfrn_id == '') && !strstr($_SERVER["HTTP_USER_AGENT"], 'Friendica')) {
  34                 $nickname = $a->argv[1];
  35                 header("Content-type: application/atom+xml");
  36                 echo OStatus::feed($nickname, $last_update, 10);
  37                 killme();
  38         }
  39
  40         $direction = -1;
  41
  42         if (strpos($dfrn_id, ':') == 1) {
  43                 $direction = intval(substr($dfrn_id, 0, 1));
  44                 $dfrn_id = substr($dfrn_id, 2);
  45         }
  46
  47         $hidewall = false;
  48
  49         if (($dfrn_id === '') && (!x($_POST, 'dfrn_id'))) {
  50                 if (Config::get('system', 'block_public') && !local_user() && !remote_user()) {
  51                         http_status_exit(403);
  52                 }
  53
  54                 $user = '';
  55                 if ($a->argc > 1) {
  56                         $r = q("SELECT `hidewall`,`nickname` FROM `user` WHERE `user`.`nickname` = '%s' LIMIT 1",
  57                                 dbesc($a->argv[1])
  58                         );
  59                         if (!$r) {
  60                                 http_status_exit(404);
  61                         }
  62
  63                         $hidewall = ($r[0]['hidewall'] && !local_user());
  64
  65                         $user = $r[0]['nickname'];
  66                 }
  67
  68                 logger('dfrn_poll: public feed request from ' . $_SERVER['REMOTE_ADDR'] . ' for ' . $user);
  69                 header("Content-type: application/atom+xml");
  70                 echo DFRN::feed('', $user, $last_update, 0, $hidewall);
  71                 killme();
  72         }
  73
  74         if (($type === 'profile') && (!strlen($sec))) {
  75                 $sql_extra = '';
  76                 switch ($direction) {
  77                         case -1:
  78                                 $sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", dbesc($dfrn_id), dbesc($dfrn_id));
  79                                 $my_id = $dfrn_id;
  80                                 break;
  81                         case 0:
  82                                 $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
  83                                 $my_id = '1:' . $dfrn_id;
  84                                 break;
  85                         case 1:
  86                                 $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
  87                                 $my_id = '0:' . $dfrn_id;
  88                                 break;
  89                         default:
  90                                 goaway(System::baseUrl());
  91                                 break; // NOTREACHED
  92                 }
  93
  94                 $r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname`
  95                         FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
  96                         WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
  97                         AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
  98                         dbesc($a->argv[1])
  99                 );
 100
 101                 if (DBM::is_result($r)) {
 102                         $s = Network::fetchURL($r[0]['poll'] . '?dfrn_id=' . $my_id . '&type=profile-check');
 103
 104                         logger("dfrn_poll: old profile returns " . $s, LOGGER_DATA);
 105
 106                         if (strlen($s)) {
 107                                 $xml = parse_xml_string($s);
 108
 109                                 if ((int) $xml->status === 1) {
 110                                         $_SESSION['authenticated'] = 1;
 111                                         if (!x($_SESSION, 'remote')) {
 112                                                 $_SESSION['remote'] = [];
 113                                         }
 114
 115                                         $_SESSION['remote'][] = ['cid' => $r[0]['id'], 'uid' => $r[0]['uid'], 'url' => $r[0]['url']];
 116
 117                                         $_SESSION['visitor_id'] = $r[0]['id'];
 118                                         $_SESSION['visitor_home'] = $r[0]['url'];
 119                                         $_SESSION['visitor_handle'] = $r[0]['addr'];
 120                                         $_SESSION['visitor_visiting'] = $r[0]['uid'];
 121                                         if (!$quiet) {
 122                                                 info(L10n::t('%1$s welcomes %2$s', $r[0]['username'], $r[0]['name']) . EOL);
 123                                         }
 124
 125                                         // Visitors get 1 day session.
 126                                         $session_id = session_id();
 127                                         $expire = time() + 86400;
 128                                         q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s'",
 129                                                 dbesc($expire),
 130                                                 dbesc($session_id)
 131                                         );
 132                                 }
 133                         }
 134                         $profile = $r[0]['nickname'];
 135                         goaway((strlen($destination_url)) ? $destination_url : System::baseUrl() . '/profile/' . $profile);
 136                 }
 137                 goaway(System::baseUrl());
 138         }
 139
 140         if ($type === 'profile-check' && $dfrn_version < 2.2) {
 141                 if ((strlen($challenge)) && (strlen($sec))) {
 142                         q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
 143                         $r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1",
 144                                 dbesc($sec)
 145                         );
 146                         if (!DBM::is_result($r)) {
 147                                 xml_status(3, 'No ticket');
 148                                 // NOTREACHED
 149                         }
 150
 151                         $orig_id = $r[0]['dfrn_id'];
 152                         if (strpos($orig_id, ':')) {
 153                                 $orig_id = substr($orig_id, 2);
 154                         }
 155
 156                         $c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
 157                                 intval($r[0]['cid'])
 158                         );
 159                         if (!DBM::is_result($c)) {
 160                                 xml_status(3, 'No profile');
 161                         }
 162
 163                         $contact = $c[0];
 164
 165                         $sent_dfrn_id = hex2bin($dfrn_id);
 166                         $challenge = hex2bin($challenge);
 167
 168                         $final_dfrn_id = '';
 169
 170                         if (($contact['duplex']) && strlen($contact['prvkey'])) {
 171                                 openssl_private_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['prvkey']);
 172                                 openssl_private_decrypt($challenge, $decoded_challenge, $contact['prvkey']);
 173                         } else {
 174                                 openssl_public_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['pubkey']);
 175                                 openssl_public_decrypt($challenge, $decoded_challenge, $contact['pubkey']);
 176                         }
 177
 178                         $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
 179
 180                         if (strpos($final_dfrn_id, ':') == 1) {
 181                                 $final_dfrn_id = substr($final_dfrn_id, 2);
 182                         }
 183
 184                         if ($final_dfrn_id != $orig_id) {
 185                                 logger('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, LOGGER_DEBUG);
 186                                 // did not decode properly - cannot trust this site
 187                                 xml_status(3, 'Bad decryption');
 188                         }
 189
 190                         header("Content-type: text/xml");
 191                         echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
 192                         killme();
 193                         // NOTREACHED
 194                 } else {
 195                         // old protocol
 196                         switch ($direction) {
 197                                 case 1:
 198                                         $dfrn_id = '0:' . $dfrn_id;
 199                                         break;
 200                                 case 0:
 201                                         $dfrn_id = '1:' . $dfrn_id;
 202                                         break;
 203                                 default:
 204                                         break;
 205                         }
 206
 207                         q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
 208                         $r = q("SELECT * FROM `profile_check` WHERE `dfrn_id` = '%s' ORDER BY `expire` DESC",
 209                                 dbesc($dfrn_id));
 210                         if (DBM::is_result($r)) {
 211                                 xml_status(1);
 212                                 return; // NOTREACHED
 213                         }
 214                         xml_status(0);
 215                         return; // NOTREACHED
 216                 }
 217         }
 218 }
 219
 220 function dfrn_poll_post(App $a)
 221 {
 222         $dfrn_id      = x($_POST,'dfrn_id')      ? $_POST['dfrn_id']              : '';
 223         $challenge    = x($_POST,'challenge')    ? $_POST['challenge']            : '';
 224         $url          = x($_POST,'url')          ? $_POST['url']                  : '';
 225         $sec          = x($_POST,'sec')          ? $_POST['sec']                  : '';
 226         $ptype        = x($_POST,'type')         ? $_POST['type']                 : '';
 227         $dfrn_version = x($_POST,'dfrn_version') ? (float) $_POST['dfrn_version'] : 2.0;
 228         $perm         = x($_POST,'perm')         ? $_POST['perm']                 : 'r';
 229
 230         if ($ptype === 'profile-check') {
 231                 if (strlen($challenge) && strlen($sec)) {
 232                         logger('dfrn_poll: POST: profile-check');
 233
 234                         q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
 235                         $r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1",
 236                                 dbesc($sec)
 237                         );
 238                         if (!DBM::is_result($r)) {
 239                                 xml_status(3, 'No ticket');
 240                                 // NOTREACHED
 241                         }
 242
 243                         $orig_id = $r[0]['dfrn_id'];
 244                         if (strpos($orig_id, ':')) {
 245                                 $orig_id = substr($orig_id, 2);
 246                         }
 247
 248                         $c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
 249                                 intval($r[0]['cid'])
 250                         );
 251                         if (!DBM::is_result($c)) {
 252                                 xml_status(3, 'No profile');
 253                         }
 254
 255                         $contact = $c[0];
 256
 257                         $sent_dfrn_id = hex2bin($dfrn_id);
 258                         $challenge = hex2bin($challenge);
 259
 260                         $final_dfrn_id = '';
 261
 262                         if ($contact['duplex'] && strlen($contact['prvkey'])) {
 263                                 openssl_private_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['prvkey']);
 264                                 openssl_private_decrypt($challenge, $decoded_challenge, $contact['prvkey']);
 265                         } else {
 266                                 openssl_public_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['pubkey']);
 267                                 openssl_public_decrypt($challenge, $decoded_challenge, $contact['pubkey']);
 268                         }
 269
 270                         $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
 271
 272                         if (strpos($final_dfrn_id, ':') == 1) {
 273                                 $final_dfrn_id = substr($final_dfrn_id, 2);
 274                         }
 275
 276                         if ($final_dfrn_id != $orig_id) {
 277                                 logger('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, LOGGER_DEBUG);
 278                                 // did not decode properly - cannot trust this site
 279                                 xml_status(3, 'Bad decryption');
 280                         }
 281
 282                         header("Content-type: text/xml");
 283                         echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
 284                         killme();
 285                         // NOTREACHED
 286                 }
 287         }
 288
 289         $direction = -1;
 290         if (strpos($dfrn_id, ':') == 1) {
 291                 $direction = intval(substr($dfrn_id, 0, 1));
 292                 $dfrn_id = substr($dfrn_id, 2);
 293         }
 294
 295         $r = q("SELECT * FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s' LIMIT 1",
 296                 dbesc($dfrn_id),
 297                 dbesc($challenge)
 298         );
 299
 300         if (!DBM::is_result($r)) {
 301                 killme();
 302         }
 303
 304         $type = $r[0]['type'];
 305         $last_update = $r[0]['last_update'];
 306
 307         $r = q("DELETE FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s'",
 308                 dbesc($dfrn_id),
 309                 dbesc($challenge)
 310         );
 311
 312
 313         $sql_extra = '';
 314         switch ($direction) {
 315                 case -1:
 316                         $sql_extra = sprintf(" AND `issued-id` = '%s' ", dbesc($dfrn_id));
 317                         $my_id = $dfrn_id;
 318                         break;
 319                 case 0:
 320                         $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 321                         $my_id = '1:' . $dfrn_id;
 322                         break;
 323                 case 1:
 324                         $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 325                         $my_id = '0:' . $dfrn_id;
 326                         break;
 327                 default:
 328                         goaway(System::baseUrl());
 329                         break; // NOTREACHED
 330         }
 331
 332         $r = q("SELECT * FROM `contact` WHERE `blocked` = 0 AND `pending` = 0 $sql_extra LIMIT 1");
 333         if (!DBM::is_result($r)) {
 334                 killme();
 335         }
 336
 337         $contact = $r[0];
 338         $owner_uid = $r[0]['uid'];
 339         $contact_id = $r[0]['id'];
 340
 341         if ($type === 'reputation' && strlen($url)) {
 342                 $r = q("SELECT * FROM `contact` WHERE `url` = '%s' AND `uid` = %d LIMIT 1",
 343                         dbesc($url),
 344                         intval($owner_uid)
 345                 );
 346                 $reputation = 0;
 347                 $text = '';
 348
 349                 if (DBM::is_result($r)) {
 350                         $reputation = $r[0]['rating'];
 351                         $text = $r[0]['reason'];
 352
 353                         if ($r[0]['id'] == $contact_id) { // inquiring about own reputation not allowed
 354                                 $reputation = 0;
 355                                 $text = '';
 356                         }
 357                 }
 358
 359                 echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
 360                 <reputation>
 361                         <url>$url</url>
 362                         <rating>$reputation</rating>
 363                         <description>$text</description>
 364                 </reputation>
 365                 ";
 366                 killme();
 367                 // NOTREACHED
 368         } else {
 369                 // Update the writable flag if it changed
 370                 logger('dfrn_poll: post request feed: ' . print_r($_POST, true), LOGGER_DATA);
 371                 if ($dfrn_version >= 2.21) {
 372                         if ($perm === 'rw') {
 373                                 $writable = 1;
 374                         } else {
 375                                 $writable = 0;
 376                         }
 377
 378                         if ($writable != $contact['writable']) {
 379                                 q("UPDATE `contact` SET `writable` = %d WHERE `id` = %d",
 380                                         intval($writable),
 381                                         intval($contact_id)
 382                                 );
 383                         }
 384                 }
 385
 386                 header("Content-type: application/atom+xml");
 387                 $o = DFRN::feed($dfrn_id, $a->argv[1], $last_update, $direction);
 388                 echo $o;
 389                 killme();
 390         }
 391 }
 392
 393 function dfrn_poll_content(App $a)
 394 {
 395         $dfrn_id         = x($_GET,'dfrn_id')         ? $_GET['dfrn_id']              : '';
 396         $type            = x($_GET,'type')            ? $_GET['type']                 : 'data';
 397         $last_update     = x($_GET,'last_update')     ? $_GET['last_update']          : '';
 398         $destination_url = x($_GET,'destination_url') ? $_GET['destination_url']      : '';
 399         $sec             = x($_GET,'sec')             ? $_GET['sec']                  : '';
 400         $dfrn_version    = x($_GET,'dfrn_version')    ? (float) $_GET['dfrn_version'] : 2.0;
 401         $perm            = x($_GET,'perm')            ? $_GET['perm']                 : 'r';
 402         $quiet           = x($_GET,'quiet')           ? true                          : false;
 403
 404         $direction = -1;
 405         if (strpos($dfrn_id, ':') == 1) {
 406                 $direction = intval(substr($dfrn_id, 0, 1));
 407                 $dfrn_id = substr($dfrn_id, 2);
 408         }
 409
 410         if ($dfrn_id != '') {
 411                 // initial communication from external contact
 412                 $hash = random_string();
 413
 414                 $status = 0;
 415
 416                 $r = q("DELETE FROM `challenge` WHERE `expire` < " . intval(time()));
 417
 418                 if ($type !== 'profile') {
 419                         $r = q("INSERT INTO `challenge` ( `challenge`, `dfrn-id`, `expire` , `type`, `last_update` )
 420                                 VALUES( '%s', '%s', '%s', '%s', '%s' ) ",
 421                                 dbesc($hash),
 422                                 dbesc($dfrn_id),
 423                                 intval(time() + 60 ),
 424                                 dbesc($type),
 425                                 dbesc($last_update)
 426                         );
 427                 }
 428
 429                 $sql_extra = '';
 430                 switch ($direction) {
 431                         case -1:
 432                                 if ($type === 'profile') {
 433                                         $sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", dbesc($dfrn_id), dbesc($dfrn_id));
 434                                 } else {
 435                                         $sql_extra = sprintf(" AND `issued-id` = '%s' ", dbesc($dfrn_id));
 436                                 }
 437
 438                                 $my_id = $dfrn_id;
 439                                 break;
 440                         case 0:
 441                                 $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 442                                 $my_id = '1:' . $dfrn_id;
 443                                 break;
 444                         case 1:
 445                                 $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 446                                 $my_id = '0:' . $dfrn_id;
 447                                 break;
 448                         default:
 449                                 goaway(System::baseUrl());
 450                                 break; // NOTREACHED
 451                 }
 452
 453                 $nickname = $a->argv[1];
 454
 455                 $r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname`
 456                         FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
 457                         WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
 458                         AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
 459                         dbesc($nickname)
 460                 );
 461                 if (DBM::is_result($r)) {
 462                         $challenge = '';
 463                         $encrypted_id = '';
 464                         $id_str = $my_id . '.' . mt_rand(1000, 9999);
 465
 466                         if (($r[0]['duplex'] && strlen($r[0]['pubkey'])) || !strlen($r[0]['prvkey'])) {
 467                                 openssl_public_encrypt($hash, $challenge, $r[0]['pubkey']);
 468                                 openssl_public_encrypt($id_str, $encrypted_id, $r[0]['pubkey']);
 469                         } else {
 470                                 openssl_private_encrypt($hash, $challenge, $r[0]['prvkey']);
 471                                 openssl_private_encrypt($id_str, $encrypted_id, $r[0]['prvkey']);
 472                         }
 473
 474                         $challenge = bin2hex($challenge);
 475                         $encrypted_id = bin2hex($encrypted_id);
 476                 } else {
 477                         $status = 1;
 478                         $challenge = '';
 479                         $encrypted_id = '';
 480                 }
 481
 482                 if (($type === 'profile') && (strlen($sec))) {
 483                         // URL reply
 484                         if ($dfrn_version < 2.2) {
 485                                 $s = Network::fetchURL($r[0]['poll']
 486                                         . '?dfrn_id=' . $encrypted_id
 487                                         . '&type=profile-check'
 488                                         . '&dfrn_version=' . DFRN_PROTOCOL_VERSION
 489                                         . '&challenge=' . $challenge
 490                                         . '&sec=' . $sec
 491                                 );
 492                         } else {
 493                                 $s = Network::postURL($r[0]['poll'], [
 494                                         'dfrn_id' => $encrypted_id,
 495                                         'type' => 'profile-check',
 496                                         'dfrn_version' => DFRN_PROTOCOL_VERSION,
 497                                         'challenge' => $challenge,
 498                                         'sec' => $sec
 499                                 ]);
 500                         }
 501
 502                         $profile = ((DBM::is_result($r) && $r[0]['nickname']) ? $r[0]['nickname'] : $nickname);
 503
 504                         switch ($destination_url) {
 505                                 case 'profile':
 506                                         $dest = System::baseUrl() . '/profile/' . $profile . '?f=&tab=profile';
 507                                         break;
 508                                 case 'photos':
 509                                         $dest = System::baseUrl() . '/photos/' . $profile;
 510                                         break;
 511                                 case 'status':
 512                                 case '':
 513                                         $dest = System::baseUrl() . '/profile/' . $profile;
 514                                         break;
 515                                 default:
 516                                         $appendix = (strstr($destination_url, '?') ? '&f=&redir=1' : '?f=&redir=1');
 517                                         $dest = $destination_url . $appendix;
 518                                         break;
 519                         }
 520
 521                         logger("dfrn_poll: sec profile: " . $s, LOGGER_DATA);
 522
 523                         if (strlen($s) && strstr($s, '<?xml')) {
 524                                 $xml = parse_xml_string($s);
 525
 526                                 logger('dfrn_poll: profile: parsed xml: ' . print_r($xml, true), LOGGER_DATA);
 527
 528                                 logger('dfrn_poll: secure profile: challenge: ' . $xml->challenge . ' expecting ' . $hash);
 529                                 logger('dfrn_poll: secure profile: sec: ' . $xml->sec . ' expecting ' . $sec);
 530
 531                                 if (((int) $xml->status == 0) && ($xml->challenge == $hash) && ($xml->sec == $sec)) {
 532                                         $_SESSION['authenticated'] = 1;
 533                                         if (!x($_SESSION, 'remote')) {
 534                                                 $_SESSION['remote'] = [];
 535                                         }
 536
 537                                         $_SESSION['remote'][] = ['cid' => $r[0]['id'], 'uid' => $r[0]['uid'], 'url' => $r[0]['url']];
 538                                         $_SESSION['visitor_id'] = $r[0]['id'];
 539                                         $_SESSION['visitor_home'] = $r[0]['url'];
 540                                         $_SESSION['visitor_visiting'] = $r[0]['uid'];
 541                                         if (!$quiet) {
 542                                                 info(L10n::t('%1$s welcomes %2$s', $r[0]['username'], $r[0]['name']) . EOL);
 543                                         }
 544
 545                                         // Visitors get 1 day session.
 546                                         $session_id = session_id();
 547                                         $expire = time() + 86400;
 548                                         q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s'",
 549                                                 dbesc($expire),
 550                                                 dbesc($session_id)
 551                                         );
 552                                 }
 553
 554                                 goaway($dest);
 555                         }
 556                         goaway($dest);
 557                         // NOTREACHED
 558                 } else {
 559                         // XML reply
 560                         header("Content-type: text/xml");
 561                         echo '<?xml version="1.0" encoding="UTF-8"?>' . "\r\n"
 562                                 . '<dfrn_poll>' . "\r\n"
 563                                 . "\t" . '<status>' . $status . '</status>' . "\r\n"
 564                                 . "\t" . '<dfrn_version>' . DFRN_PROTOCOL_VERSION . '</dfrn_version>' . "\r\n"
 565                                 . "\t" . '<dfrn_id>' . $encrypted_id . '</dfrn_id>' . "\r\n"
 566                                 . "\t" . '<challenge>' . $challenge . '</challenge>' . "\r\n"
 567                                 . '</dfrn_poll>' . "\r\n";
 568                         killme();
 569                         // NOTREACHED
 570                 }
 571         }
 572 }