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