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 use Friendica\Util\XML;
  16
  17 require_once 'include/items.php';
  18
  19 function dfrn_poll_init(App $a)
  20 {
  21         Login::sessionAuth();
  22
  23         $dfrn_id         = defaults($_GET, 'dfrn_id'        , '');
  24         $type            = defaults($_GET, 'type'           , 'data');
  25         $last_update     = defaults($_GET, 'last_update'    , '');
  26         $destination_url = defaults($_GET, 'destination_url', '');
  27         $challenge       = defaults($_GET, 'challenge'      , '');
  28         $sec             = defaults($_GET, 'sec'            , '');
  29         $dfrn_version    = (float) defaults($_GET, 'dfrn_version'   , 2.0);
  30         $perm            = defaults($_GET, 'perm'           , 'r');
  31         $quiet                   = x($_GET, 'quiet');
  32
  33         // Possibly it is an OStatus compatible server that requests a user feed
  34         if (($a->argc > 1) && ($dfrn_id == '') && !strstr($_SERVER["HTTP_USER_AGENT"], 'Friendica')) {
  35                 $nickname = $a->argv[1];
  36                 header("Content-type: application/atom+xml");
  37                 echo OStatus::feed($nickname, $last_update, 10);
  38                 killme();
  39         }
  40
  41         $direction = -1;
  42
  43         if (strpos($dfrn_id, ':') == 1) {
  44                 $direction = intval(substr($dfrn_id, 0, 1));
  45                 $dfrn_id = substr($dfrn_id, 2);
  46         }
  47
  48         $hidewall = false;
  49
  50         if (($dfrn_id === '') && (!x($_POST, 'dfrn_id'))) {
  51                 if (Config::get('system', 'block_public') && !local_user() && !remote_user()) {
  52                         System::httpExit(403);
  53                 }
  54
  55                 $user = '';
  56                 if ($a->argc > 1) {
  57                         $r = q("SELECT `hidewall`,`nickname` FROM `user` WHERE `user`.`nickname` = '%s' LIMIT 1",
  58                                 dbesc($a->argv[1])
  59                         );
  60                         if (!$r) {
  61                                 System::httpExit(404);
  62                         }
  63
  64                         $hidewall = ($r[0]['hidewall'] && !local_user());
  65
  66                         $user = $r[0]['nickname'];
  67                 }
  68
  69                 logger('dfrn_poll: public feed request from ' . $_SERVER['REMOTE_ADDR'] . ' for ' . $user);
  70                 header("Content-type: application/atom+xml");
  71                 echo DFRN::feed('', $user, $last_update, 0, $hidewall);
  72                 killme();
  73         }
  74
  75         if (($type === 'profile') && (!strlen($sec))) {
  76                 $sql_extra = '';
  77                 switch ($direction) {
  78                         case -1:
  79                                 $sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", dbesc($dfrn_id), dbesc($dfrn_id));
  80                                 $my_id = $dfrn_id;
  81                                 break;
  82                         case 0:
  83                                 $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
  84                                 $my_id = '1:' . $dfrn_id;
  85                                 break;
  86                         case 1:
  87                                 $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
  88                                 $my_id = '0:' . $dfrn_id;
  89                                 break;
  90                         default:
  91                                 goaway(System::baseUrl());
  92                                 break; // NOTREACHED
  93                 }
  94
  95                 $r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname`
  96                         FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
  97                         WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
  98                         AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
  99                         dbesc($a->argv[1])
 100                 );
 101
 102                 if (DBM::is_result($r)) {
 103                         $s = Network::fetchUrl($r[0]['poll'] . '?dfrn_id=' . $my_id . '&type=profile-check');
 104
 105                         logger("dfrn_poll: old profile returns " . $s, LOGGER_DATA);
 106
 107                         if (strlen($s)) {
 108                                 $xml = XML::parseString($s);
 109
 110                                 if ((int) $xml->status === 1) {
 111                                         $_SESSION['authenticated'] = 1;
 112                                         if (!x($_SESSION, 'remote')) {
 113                                                 $_SESSION['remote'] = [];
 114                                         }
 115
 116                                         $_SESSION['remote'][] = ['cid' => $r[0]['id'], 'uid' => $r[0]['uid'], 'url' => $r[0]['url']];
 117
 118                                         $_SESSION['visitor_id'] = $r[0]['id'];
 119                                         $_SESSION['visitor_home'] = $r[0]['url'];
 120                                         $_SESSION['visitor_handle'] = $r[0]['addr'];
 121                                         $_SESSION['visitor_visiting'] = $r[0]['uid'];
 122                                         if (!$quiet) {
 123                                                 info(L10n::t('%1$s welcomes %2$s', $r[0]['username'], $r[0]['name']) . EOL);
 124                                         }
 125
 126                                         // Visitors get 1 day session.
 127                                         $session_id = session_id();
 128                                         $expire = time() + 86400;
 129                                         q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s'",
 130                                                 dbesc($expire),
 131                                                 dbesc($session_id)
 132                                         );
 133                                 }
 134                         }
 135                         $profile = $r[0]['nickname'];
 136                         goaway((strlen($destination_url)) ? $destination_url : System::baseUrl() . '/profile/' . $profile);
 137                 }
 138                 goaway(System::baseUrl());
 139         }
 140
 141         if ($type === 'profile-check' && $dfrn_version < 2.2) {
 142                 if ((strlen($challenge)) && (strlen($sec))) {
 143                         q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
 144                         $r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1",
 145                                 dbesc($sec)
 146                         );
 147                         if (!DBM::is_result($r)) {
 148                                 System::xmlExit(3, 'No ticket');
 149                                 // NOTREACHED
 150                         }
 151
 152                         $orig_id = $r[0]['dfrn_id'];
 153                         if (strpos($orig_id, ':')) {
 154                                 $orig_id = substr($orig_id, 2);
 155                         }
 156
 157                         $c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
 158                                 intval($r[0]['cid'])
 159                         );
 160                         if (!DBM::is_result($c)) {
 161                                 System::xmlExit(3, 'No profile');
 162                         }
 163
 164                         $contact = $c[0];
 165
 166                         $sent_dfrn_id = hex2bin($dfrn_id);
 167                         $challenge = hex2bin($challenge);
 168
 169                         $final_dfrn_id = '';
 170
 171                         if (($contact['duplex']) && strlen($contact['prvkey'])) {
 172                                 openssl_private_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['prvkey']);
 173                                 openssl_private_decrypt($challenge, $decoded_challenge, $contact['prvkey']);
 174                         } else {
 175                                 openssl_public_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['pubkey']);
 176                                 openssl_public_decrypt($challenge, $decoded_challenge, $contact['pubkey']);
 177                         }
 178
 179                         $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
 180
 181                         if (strpos($final_dfrn_id, ':') == 1) {
 182                                 $final_dfrn_id = substr($final_dfrn_id, 2);
 183                         }
 184
 185                         if ($final_dfrn_id != $orig_id) {
 186                                 logger('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, LOGGER_DEBUG);
 187                                 // did not decode properly - cannot trust this site
 188                                 System::xmlExit(3, 'Bad decryption');
 189                         }
 190
 191                         header("Content-type: text/xml");
 192                         echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
 193                         killme();
 194                         // NOTREACHED
 195                 } else {
 196                         // old protocol
 197                         switch ($direction) {
 198                                 case 1:
 199                                         $dfrn_id = '0:' . $dfrn_id;
 200                                         break;
 201                                 case 0:
 202                                         $dfrn_id = '1:' . $dfrn_id;
 203                                         break;
 204                                 default:
 205                                         break;
 206                         }
 207
 208                         q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
 209                         $r = q("SELECT * FROM `profile_check` WHERE `dfrn_id` = '%s' ORDER BY `expire` DESC",
 210                                 dbesc($dfrn_id));
 211                         if (DBM::is_result($r)) {
 212                                 System::xmlExit(1);
 213                                 return; // NOTREACHED
 214                         }
 215                         System::xmlExit(0);
 216                         return; // NOTREACHED
 217                 }
 218         }
 219 }
 220
 221 function dfrn_poll_post(App $a)
 222 {
 223         $dfrn_id      = x($_POST,'dfrn_id')      ? $_POST['dfrn_id']              : '';
 224         $challenge    = x($_POST,'challenge')    ? $_POST['challenge']            : '';
 225         $url          = x($_POST,'url')          ? $_POST['url']                  : '';
 226         $sec          = x($_POST,'sec')          ? $_POST['sec']                  : '';
 227         $ptype        = x($_POST,'type')         ? $_POST['type']                 : '';
 228         $dfrn_version = x($_POST,'dfrn_version') ? (float) $_POST['dfrn_version'] : 2.0;
 229         $perm         = x($_POST,'perm')         ? $_POST['perm']                 : 'r';
 230
 231         if ($ptype === 'profile-check') {
 232                 if (strlen($challenge) && strlen($sec)) {
 233                         logger('dfrn_poll: POST: profile-check');
 234
 235                         q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
 236                         $r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1",
 237                                 dbesc($sec)
 238                         );
 239                         if (!DBM::is_result($r)) {
 240                                 System::xmlExit(3, 'No ticket');
 241                                 // NOTREACHED
 242                         }
 243
 244                         $orig_id = $r[0]['dfrn_id'];
 245                         if (strpos($orig_id, ':')) {
 246                                 $orig_id = substr($orig_id, 2);
 247                         }
 248
 249                         $c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
 250                                 intval($r[0]['cid'])
 251                         );
 252                         if (!DBM::is_result($c)) {
 253                                 System::xmlExit(3, 'No profile');
 254                         }
 255
 256                         $contact = $c[0];
 257
 258                         $sent_dfrn_id = hex2bin($dfrn_id);
 259                         $challenge = hex2bin($challenge);
 260
 261                         $final_dfrn_id = '';
 262
 263                         if ($contact['duplex'] && strlen($contact['prvkey'])) {
 264                                 openssl_private_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['prvkey']);
 265                                 openssl_private_decrypt($challenge, $decoded_challenge, $contact['prvkey']);
 266                         } else {
 267                                 openssl_public_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['pubkey']);
 268                                 openssl_public_decrypt($challenge, $decoded_challenge, $contact['pubkey']);
 269                         }
 270
 271                         $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
 272
 273                         if (strpos($final_dfrn_id, ':') == 1) {
 274                                 $final_dfrn_id = substr($final_dfrn_id, 2);
 275                         }
 276
 277                         if ($final_dfrn_id != $orig_id) {
 278                                 logger('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, LOGGER_DEBUG);
 279                                 // did not decode properly - cannot trust this site
 280                                 System::xmlExit(3, 'Bad decryption');
 281                         }
 282
 283                         header("Content-type: text/xml");
 284                         echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
 285                         killme();
 286                         // NOTREACHED
 287                 }
 288         }
 289
 290         $direction = -1;
 291         if (strpos($dfrn_id, ':') == 1) {
 292                 $direction = intval(substr($dfrn_id, 0, 1));
 293                 $dfrn_id = substr($dfrn_id, 2);
 294         }
 295
 296         $r = q("SELECT * FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s' LIMIT 1",
 297                 dbesc($dfrn_id),
 298                 dbesc($challenge)
 299         );
 300
 301         if (!DBM::is_result($r)) {
 302                 killme();
 303         }
 304
 305         $type = $r[0]['type'];
 306         $last_update = $r[0]['last_update'];
 307
 308         $r = q("DELETE FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s'",
 309                 dbesc($dfrn_id),
 310                 dbesc($challenge)
 311         );
 312
 313
 314         $sql_extra = '';
 315         switch ($direction) {
 316                 case -1:
 317                         $sql_extra = sprintf(" AND `issued-id` = '%s' ", dbesc($dfrn_id));
 318                         $my_id = $dfrn_id;
 319                         break;
 320                 case 0:
 321                         $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 322                         $my_id = '1:' . $dfrn_id;
 323                         break;
 324                 case 1:
 325                         $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 326                         $my_id = '0:' . $dfrn_id;
 327                         break;
 328                 default:
 329                         goaway(System::baseUrl());
 330                         break; // NOTREACHED
 331         }
 332
 333         $r = q("SELECT * FROM `contact` WHERE `blocked` = 0 AND `pending` = 0 $sql_extra LIMIT 1");
 334         if (!DBM::is_result($r)) {
 335                 killme();
 336         }
 337
 338         $contact = $r[0];
 339         $owner_uid = $r[0]['uid'];
 340         $contact_id = $r[0]['id'];
 341
 342         if ($type === 'reputation' && strlen($url)) {
 343                 $r = q("SELECT * FROM `contact` WHERE `url` = '%s' AND `uid` = %d LIMIT 1",
 344                         dbesc($url),
 345                         intval($owner_uid)
 346                 );
 347                 $reputation = 0;
 348                 $text = '';
 349
 350                 if (DBM::is_result($r)) {
 351                         $reputation = $r[0]['rating'];
 352                         $text = $r[0]['reason'];
 353
 354                         if ($r[0]['id'] == $contact_id) { // inquiring about own reputation not allowed
 355                                 $reputation = 0;
 356                                 $text = '';
 357                         }
 358                 }
 359
 360                 echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
 361                 <reputation>
 362                         <url>$url</url>
 363                         <rating>$reputation</rating>
 364                         <description>$text</description>
 365                 </reputation>
 366                 ";
 367                 killme();
 368                 // NOTREACHED
 369         } else {
 370                 // Update the writable flag if it changed
 371                 logger('dfrn_poll: post request feed: ' . print_r($_POST, true), LOGGER_DATA);
 372                 if ($dfrn_version >= 2.21) {
 373                         if ($perm === 'rw') {
 374                                 $writable = 1;
 375                         } else {
 376                                 $writable = 0;
 377                         }
 378
 379                         if ($writable != $contact['writable']) {
 380                                 q("UPDATE `contact` SET `writable` = %d WHERE `id` = %d",
 381                                         intval($writable),
 382                                         intval($contact_id)
 383                                 );
 384                         }
 385                 }
 386
 387                 header("Content-type: application/atom+xml");
 388                 $o = DFRN::feed($dfrn_id, $a->argv[1], $last_update, $direction);
 389                 echo $o;
 390                 killme();
 391         }
 392 }
 393
 394 function dfrn_poll_content(App $a)
 395 {
 396         $dfrn_id         = x($_GET,'dfrn_id')         ? $_GET['dfrn_id']              : '';
 397         $type            = x($_GET,'type')            ? $_GET['type']                 : 'data';
 398         $last_update     = x($_GET,'last_update')     ? $_GET['last_update']          : '';
 399         $destination_url = x($_GET,'destination_url') ? $_GET['destination_url']      : '';
 400         $sec             = x($_GET,'sec')             ? $_GET['sec']                  : '';
 401         $dfrn_version    = x($_GET,'dfrn_version')    ? (float) $_GET['dfrn_version'] : 2.0;
 402         $perm            = x($_GET,'perm')            ? $_GET['perm']                 : 'r';
 403         $quiet           = x($_GET,'quiet')           ? true                          : false;
 404
 405         $direction = -1;
 406         if (strpos($dfrn_id, ':') == 1) {
 407                 $direction = intval(substr($dfrn_id, 0, 1));
 408                 $dfrn_id = substr($dfrn_id, 2);
 409         }
 410
 411         if ($dfrn_id != '') {
 412                 // initial communication from external contact
 413                 $hash = random_string();
 414
 415                 $status = 0;
 416
 417                 $r = q("DELETE FROM `challenge` WHERE `expire` < " . intval(time()));
 418
 419                 if ($type !== 'profile') {
 420                         $r = q("INSERT INTO `challenge` ( `challenge`, `dfrn-id`, `expire` , `type`, `last_update` )
 421                                 VALUES( '%s', '%s', '%s', '%s', '%s' ) ",
 422                                 dbesc($hash),
 423                                 dbesc($dfrn_id),
 424                                 intval(time() + 60 ),
 425                                 dbesc($type),
 426                                 dbesc($last_update)
 427                         );
 428                 }
 429
 430                 $sql_extra = '';
 431                 switch ($direction) {
 432                         case -1:
 433                                 if ($type === 'profile') {
 434                                         $sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", dbesc($dfrn_id), dbesc($dfrn_id));
 435                                 } else {
 436                                         $sql_extra = sprintf(" AND `issued-id` = '%s' ", dbesc($dfrn_id));
 437                                 }
 438
 439                                 $my_id = $dfrn_id;
 440                                 break;
 441                         case 0:
 442                                 $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 443                                 $my_id = '1:' . $dfrn_id;
 444                                 break;
 445                         case 1:
 446                                 $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 447                                 $my_id = '0:' . $dfrn_id;
 448                                 break;
 449                         default:
 450                                 goaway(System::baseUrl());
 451                                 break; // NOTREACHED
 452                 }
 453
 454                 $nickname = $a->argv[1];
 455
 456                 $r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname`
 457                         FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
 458                         WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
 459                         AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
 460                         dbesc($nickname)
 461                 );
 462                 if (DBM::is_result($r)) {
 463                         $challenge = '';
 464                         $encrypted_id = '';
 465                         $id_str = $my_id . '.' . mt_rand(1000, 9999);
 466
 467                         if (($r[0]['duplex'] && strlen($r[0]['pubkey'])) || !strlen($r[0]['prvkey'])) {
 468                                 openssl_public_encrypt($hash, $challenge, $r[0]['pubkey']);
 469                                 openssl_public_encrypt($id_str, $encrypted_id, $r[0]['pubkey']);
 470                         } else {
 471                                 openssl_private_encrypt($hash, $challenge, $r[0]['prvkey']);
 472                                 openssl_private_encrypt($id_str, $encrypted_id, $r[0]['prvkey']);
 473                         }
 474
 475                         $challenge = bin2hex($challenge);
 476                         $encrypted_id = bin2hex($encrypted_id);
 477                 } else {
 478                         $status = 1;
 479                         $challenge = '';
 480                         $encrypted_id = '';
 481                 }
 482
 483                 if (($type === 'profile') && (strlen($sec))) {
 484                         // URL reply
 485                         if ($dfrn_version < 2.2) {
 486                                 $s = Network::fetchUrl($r[0]['poll']
 487                                         . '?dfrn_id=' . $encrypted_id
 488                                         . '&type=profile-check'
 489                                         . '&dfrn_version=' . DFRN_PROTOCOL_VERSION
 490                                         . '&challenge=' . $challenge
 491                                         . '&sec=' . $sec
 492                                 );
 493                         } else {
 494                                 $s = Network::post($r[0]['poll'], [
 495                                         'dfrn_id' => $encrypted_id,
 496                                         'type' => 'profile-check',
 497                                         'dfrn_version' => DFRN_PROTOCOL_VERSION,
 498                                         'challenge' => $challenge,
 499                                         'sec' => $sec
 500                                 ]);
 501                         }
 502
 503                         $profile = ((DBM::is_result($r) && $r[0]['nickname']) ? $r[0]['nickname'] : $nickname);
 504
 505                         switch ($destination_url) {
 506                                 case 'profile':
 507                                         $dest = System::baseUrl() . '/profile/' . $profile . '?f=&tab=profile';
 508                                         break;
 509                                 case 'photos':
 510                                         $dest = System::baseUrl() . '/photos/' . $profile;
 511                                         break;
 512                                 case 'status':
 513                                 case '':
 514                                         $dest = System::baseUrl() . '/profile/' . $profile;
 515                                         break;
 516                                 default:
 517                                         $appendix = (strstr($destination_url, '?') ? '&f=&redir=1' : '?f=&redir=1');
 518                                         $dest = $destination_url . $appendix;
 519                                         break;
 520                         }
 521
 522                         logger("dfrn_poll: sec profile: " . $s, LOGGER_DATA);
 523
 524                         if (strlen($s) && strstr($s, '<?xml')) {
 525                                 $xml = XML::parseString($s);
 526
 527                                 logger('dfrn_poll: profile: parsed xml: ' . print_r($xml, true), LOGGER_DATA);
 528
 529                                 logger('dfrn_poll: secure profile: challenge: ' . $xml->challenge . ' expecting ' . $hash);
 530                                 logger('dfrn_poll: secure profile: sec: ' . $xml->sec . ' expecting ' . $sec);
 531
 532                                 if (((int) $xml->status == 0) && ($xml->challenge == $hash) && ($xml->sec == $sec)) {
 533                                         $_SESSION['authenticated'] = 1;
 534                                         if (!x($_SESSION, 'remote')) {
 535                                                 $_SESSION['remote'] = [];
 536                                         }
 537
 538                                         $_SESSION['remote'][] = ['cid' => $r[0]['id'], 'uid' => $r[0]['uid'], 'url' => $r[0]['url']];
 539                                         $_SESSION['visitor_id'] = $r[0]['id'];
 540                                         $_SESSION['visitor_home'] = $r[0]['url'];
 541                                         $_SESSION['visitor_visiting'] = $r[0]['uid'];
 542                                         if (!$quiet) {
 543                                                 info(L10n::t('%1$s welcomes %2$s', $r[0]['username'], $r[0]['name']) . EOL);
 544                                         }
 545
 546                                         // Visitors get 1 day session.
 547                                         $session_id = session_id();
 548                                         $expire = time() + 86400;
 549                                         q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s'",
 550                                                 dbesc($expire),
 551                                                 dbesc($session_id)
 552                                         );
 553                                 }
 554
 555                                 goaway($dest);
 556                         }
 557                         goaway($dest);
 558                         // NOTREACHED
 559                 } else {
 560                         // XML reply
 561                         header("Content-type: text/xml");
 562                         echo '<?xml version="1.0" encoding="UTF-8"?>' . "\r\n"
 563                                 . '<dfrn_poll>' . "\r\n"
 564                                 . "\t" . '<status>' . $status . '</status>' . "\r\n"
 565                                 . "\t" . '<dfrn_version>' . DFRN_PROTOCOL_VERSION . '</dfrn_version>' . "\r\n"
 566                                 . "\t" . '<dfrn_id>' . $encrypted_id . '</dfrn_id>' . "\r\n"
 567                                 . "\t" . '<challenge>' . $challenge . '</challenge>' . "\r\n"
 568                                 . '</dfrn_poll>' . "\r\n";
 569                         killme();
 570                         // NOTREACHED
 571                 }
 572         }
 573 }