mod/dfrn_poll.php

   1 <?php
   2
   3 /**
   4  * @file mod/dfrn_poll.php
   5  */
   6
   7 use Friendica\App;
   8 use Friendica\Core\Config;
   9 use Friendica\Core\L10n;
  10 use Friendica\Core\System;
  11 use Friendica\Database\DBA;
  12 use Friendica\Module\Login;
  13 use Friendica\Protocol\DFRN;
  14 use Friendica\Protocol\OStatus;
  15 use Friendica\Util\Network;
  16 use Friendica\Util\XML;
  17
  18 require_once 'include/items.php';
  19
  20 function dfrn_poll_init(App $a)
  21 {
  22         Login::sessionAuth();
  23
  24         $dfrn_id         = defaults($_GET, 'dfrn_id'        , '');
  25         $type            = defaults($_GET, 'type'           , 'data');
  26         $last_update     = defaults($_GET, 'last_update'    , '');
  27         $destination_url = defaults($_GET, 'destination_url', '');
  28         $challenge       = defaults($_GET, 'challenge'      , '');
  29         $sec             = defaults($_GET, 'sec'            , '');
  30         $dfrn_version    = (float) defaults($_GET, 'dfrn_version'   , 2.0);
  31         $perm            = defaults($_GET, 'perm'           , 'r');
  32         $quiet                   = x($_GET, 'quiet');
  33
  34         // Possibly it is an OStatus compatible server that requests a user feed
  35         $user_agent = defaults($_SERVER, 'HTTP_USER_AGENT', '');
  36         if (($a->argc > 1) && ($dfrn_id == '') && !strstr($user_agent, 'Friendica')) {
  37                 $nickname = $a->argv[1];
  38                 header("Content-type: application/atom+xml");
  39                 echo OStatus::feed($nickname, $last_update, 10);
  40                 killme();
  41         }
  42
  43         $direction = -1;
  44
  45         if (strpos($dfrn_id, ':') == 1) {
  46                 $direction = intval(substr($dfrn_id, 0, 1));
  47                 $dfrn_id = substr($dfrn_id, 2);
  48         }
  49
  50         $hidewall = false;
  51
  52         if (($dfrn_id === '') && (!x($_POST, 'dfrn_id'))) {
  53                 if (Config::get('system', 'block_public') && !local_user() && !remote_user()) {
  54                         System::httpExit(403);
  55                 }
  56
  57                 $user = '';
  58                 if ($a->argc > 1) {
  59                         $r = q("SELECT `hidewall`,`nickname` FROM `user` WHERE `user`.`nickname` = '%s' LIMIT 1",
  60                                 DBA::escape($a->argv[1])
  61                         );
  62                         if (!$r) {
  63                                 System::httpExit(404);
  64                         }
  65
  66                         $hidewall = ($r[0]['hidewall'] && !local_user());
  67
  68                         $user = $r[0]['nickname'];
  69                 }
  70
  71                 logger('dfrn_poll: public feed request from ' . $_SERVER['REMOTE_ADDR'] . ' for ' . $user);
  72                 header("Content-type: application/atom+xml");
  73                 echo DFRN::feed('', $user, $last_update, 0, $hidewall);
  74                 killme();
  75         }
  76
  77         if (($type === 'profile') && (!strlen($sec))) {
  78                 $sql_extra = '';
  79                 switch ($direction) {
  80                         case -1:
  81                                 $sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", DBA::escape($dfrn_id), DBA::escape($dfrn_id));
  82                                 $my_id = $dfrn_id;
  83                                 break;
  84                         case 0:
  85                                 $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
  86                                 $my_id = '1:' . $dfrn_id;
  87                                 break;
  88                         case 1:
  89                                 $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
  90                                 $my_id = '0:' . $dfrn_id;
  91                                 break;
  92                         default:
  93                                 goaway(System::baseUrl());
  94                                 break; // NOTREACHED
  95                 }
  96
  97                 $r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname`
  98                         FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
  99                         WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
 100                         AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
 101                         DBA::escape($a->argv[1])
 102                 );
 103
 104                 if (DBA::isResult($r)) {
 105                         $s = Network::fetchUrl($r[0]['poll'] . '?dfrn_id=' . $my_id . '&type=profile-check');
 106
 107                         logger("dfrn_poll: old profile returns " . $s, LOGGER_DATA);
 108
 109                         if (strlen($s)) {
 110                                 $xml = XML::parseString($s);
 111
 112                                 if ((int) $xml->status === 1) {
 113                                         $_SESSION['authenticated'] = 1;
 114                                         if (!x($_SESSION, 'remote')) {
 115                                                 $_SESSION['remote'] = [];
 116                                         }
 117
 118                                         $_SESSION['remote'][] = ['cid' => $r[0]['id'], 'uid' => $r[0]['uid'], 'url' => $r[0]['url']];
 119
 120                                         $_SESSION['visitor_id'] = $r[0]['id'];
 121                                         $_SESSION['visitor_home'] = $r[0]['url'];
 122                                         $_SESSION['visitor_handle'] = $r[0]['addr'];
 123                                         $_SESSION['visitor_visiting'] = $r[0]['uid'];
 124                                         $_SESSION['my_url'] = $r[0]['url'];
 125                                         if (!$quiet) {
 126                                                 info(L10n::t('%1$s welcomes %2$s', $r[0]['username'], $r[0]['name']) . EOL);
 127                                         }
 128
 129                                         // Visitors get 1 day session.
 130                                         $session_id = session_id();
 131                                         $expire = time() + 86400;
 132                                         q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s'",
 133                                                 DBA::escape($expire),
 134                                                 DBA::escape($session_id)
 135                                         );
 136                                 }
 137                         }
 138                         $profile = $r[0]['nickname'];
 139                         goaway((strlen($destination_url)) ? $destination_url : System::baseUrl() . '/profile/' . $profile);
 140                 }
 141                 goaway(System::baseUrl());
 142         }
 143
 144         if ($type === 'profile-check' && $dfrn_version < 2.2) {
 145                 if ((strlen($challenge)) && (strlen($sec))) {
 146                         DBA::delete('profile_check', ["`expire` < ?", time()]);
 147                         $r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1",
 148                                 DBA::escape($sec)
 149                         );
 150                         if (!DBA::isResult($r)) {
 151                                 System::xmlExit(3, 'No ticket');
 152                                 // NOTREACHED
 153                         }
 154
 155                         $orig_id = $r[0]['dfrn_id'];
 156                         if (strpos($orig_id, ':')) {
 157                                 $orig_id = substr($orig_id, 2);
 158                         }
 159
 160                         $c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
 161                                 intval($r[0]['cid'])
 162                         );
 163                         if (!DBA::isResult($c)) {
 164                                 System::xmlExit(3, 'No profile');
 165                         }
 166
 167                         $contact = $c[0];
 168
 169                         $sent_dfrn_id = hex2bin($dfrn_id);
 170                         $challenge = hex2bin($challenge);
 171
 172                         $final_dfrn_id = '';
 173
 174                         if (($contact['duplex']) && strlen($contact['prvkey'])) {
 175                                 openssl_private_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['prvkey']);
 176                                 openssl_private_decrypt($challenge, $decoded_challenge, $contact['prvkey']);
 177                         } else {
 178                                 openssl_public_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['pubkey']);
 179                                 openssl_public_decrypt($challenge, $decoded_challenge, $contact['pubkey']);
 180                         }
 181
 182                         $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
 183
 184                         if (strpos($final_dfrn_id, ':') == 1) {
 185                                 $final_dfrn_id = substr($final_dfrn_id, 2);
 186                         }
 187
 188                         if ($final_dfrn_id != $orig_id) {
 189                                 logger('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, LOGGER_DEBUG);
 190                                 // did not decode properly - cannot trust this site
 191                                 System::xmlExit(3, 'Bad decryption');
 192                         }
 193
 194                         header("Content-type: text/xml");
 195                         echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
 196                         killme();
 197                         // NOTREACHED
 198                 } else {
 199                         // old protocol
 200                         switch ($direction) {
 201                                 case 1:
 202                                         $dfrn_id = '0:' . $dfrn_id;
 203                                         break;
 204                                 case 0:
 205                                         $dfrn_id = '1:' . $dfrn_id;
 206                                         break;
 207                                 default:
 208                                         break;
 209                         }
 210
 211                         DBA::delete('profile_check', ["`expire` < ?", time()]);
 212                         $r = q("SELECT * FROM `profile_check` WHERE `dfrn_id` = '%s' ORDER BY `expire` DESC",
 213                                 DBA::escape($dfrn_id));
 214                         if (DBA::isResult($r)) {
 215                                 System::xmlExit(1);
 216                                 return; // NOTREACHED
 217                         }
 218                         System::xmlExit(0);
 219                         return; // NOTREACHED
 220                 }
 221         }
 222 }
 223
 224 function dfrn_poll_post(App $a)
 225 {
 226         $dfrn_id      = x($_POST,'dfrn_id')      ? $_POST['dfrn_id']              : '';
 227         $challenge    = x($_POST,'challenge')    ? $_POST['challenge']            : '';
 228         $url          = x($_POST,'url')          ? $_POST['url']                  : '';
 229         $sec          = x($_POST,'sec')          ? $_POST['sec']                  : '';
 230         $ptype        = x($_POST,'type')         ? $_POST['type']                 : '';
 231         $dfrn_version = x($_POST,'dfrn_version') ? (float) $_POST['dfrn_version'] : 2.0;
 232         $perm         = x($_POST,'perm')         ? $_POST['perm']                 : 'r';
 233
 234         if ($ptype === 'profile-check') {
 235                 if (strlen($challenge) && strlen($sec)) {
 236                         logger('dfrn_poll: POST: profile-check');
 237
 238                         DBA::delete('profile_check', ["`expire` < ?", time()]);
 239                         $r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1",
 240                                 DBA::escape($sec)
 241                         );
 242                         if (!DBA::isResult($r)) {
 243                                 System::xmlExit(3, 'No ticket');
 244                                 // NOTREACHED
 245                         }
 246
 247                         $orig_id = $r[0]['dfrn_id'];
 248                         if (strpos($orig_id, ':')) {
 249                                 $orig_id = substr($orig_id, 2);
 250                         }
 251
 252                         $c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
 253                                 intval($r[0]['cid'])
 254                         );
 255                         if (!DBA::isResult($c)) {
 256                                 System::xmlExit(3, 'No profile');
 257                         }
 258
 259                         $contact = $c[0];
 260
 261                         $sent_dfrn_id = hex2bin($dfrn_id);
 262                         $challenge = hex2bin($challenge);
 263
 264                         $final_dfrn_id = '';
 265
 266                         if ($contact['duplex'] && strlen($contact['prvkey'])) {
 267                                 openssl_private_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['prvkey']);
 268                                 openssl_private_decrypt($challenge, $decoded_challenge, $contact['prvkey']);
 269                         } else {
 270                                 openssl_public_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['pubkey']);
 271                                 openssl_public_decrypt($challenge, $decoded_challenge, $contact['pubkey']);
 272                         }
 273
 274                         $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
 275
 276                         if (strpos($final_dfrn_id, ':') == 1) {
 277                                 $final_dfrn_id = substr($final_dfrn_id, 2);
 278                         }
 279
 280                         if ($final_dfrn_id != $orig_id) {
 281                                 logger('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, LOGGER_DEBUG);
 282                                 // did not decode properly - cannot trust this site
 283                                 System::xmlExit(3, 'Bad decryption');
 284                         }
 285
 286                         header("Content-type: text/xml");
 287                         echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
 288                         killme();
 289                         // NOTREACHED
 290                 }
 291         }
 292
 293         $direction = -1;
 294         if (strpos($dfrn_id, ':') == 1) {
 295                 $direction = intval(substr($dfrn_id, 0, 1));
 296                 $dfrn_id = substr($dfrn_id, 2);
 297         }
 298
 299         $r = q("SELECT * FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s' LIMIT 1",
 300                 DBA::escape($dfrn_id),
 301                 DBA::escape($challenge)
 302         );
 303
 304         if (!DBA::isResult($r)) {
 305                 killme();
 306         }
 307
 308         $type = $r[0]['type'];
 309         $last_update = $r[0]['last_update'];
 310
 311         DBA::delete('challenge', ['dfrn-id' => $dfrn_id, 'challenge' => $challenge]);
 312
 313         $sql_extra = '';
 314         switch ($direction) {
 315                 case -1:
 316                         $sql_extra = sprintf(" AND `issued-id` = '%s' ", DBA::escape($dfrn_id));
 317                         $my_id = $dfrn_id;
 318                         break;
 319                 case 0:
 320                         $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
 321                         $my_id = '1:' . $dfrn_id;
 322                         break;
 323                 case 1:
 324                         $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", DBA::escape($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 $sql_extra LIMIT 1");
 333         if (!DBA::isResult($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                 $r = q("SELECT * FROM `contact` WHERE `url` = '%s' AND `uid` = %d LIMIT 1",
 343                         DBA::escape($url),
 344                         intval($owner_uid)
 345                 );
 346                 $reputation = 0;
 347                 $text = '';
 348
 349                 if (DBA::isResult($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                 $status = 0;
 415
 416                 DBA::delete('challenge', ["`expire` < ?", time()]);
 417
 418                 if ($type !== 'profile') {
 419                         $r = q("INSERT INTO `challenge` ( `challenge`, `dfrn-id`, `expire` , `type`, `last_update` )
 420                                 VALUES( '%s', '%s', '%s', '%s', '%s' ) ",
 421                                 DBA::escape($hash),
 422                                 DBA::escape($dfrn_id),
 423                                 intval(time() + 60 ),
 424                                 DBA::escape($type),
 425                                 DBA::escape($last_update)
 426                         );
 427                 }
 428
 429                 $sql_extra = '';
 430                 switch ($direction) {
 431                         case -1:
 432                                 if ($type === 'profile') {
 433                                         $sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", DBA::escape($dfrn_id), DBA::escape($dfrn_id));
 434                                 } else {
 435                                         $sql_extra = sprintf(" AND `issued-id` = '%s' ", DBA::escape($dfrn_id));
 436                                 }
 437
 438                                 $my_id = $dfrn_id;
 439                                 break;
 440                         case 0:
 441                                 $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
 442                                 $my_id = '1:' . $dfrn_id;
 443                                 break;
 444                         case 1:
 445                                 $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", DBA::escape($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' $sql_extra LIMIT 1",
 459                         DBA::escape($nickname)
 460                 );
 461                 if (DBA::isResult($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                                 $s = Network::post($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                         $profile = ((DBA::isResult($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                                 $xml = XML::parseString($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                                         $_SESSION['my_url'] = $r[0]['url'];
 542                                         if (!$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                                         $expire = time() + 86400;
 549                                         q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s'",
 550                                                 DBA::escape($expire),
 551                                                 DBA::escape($session_id)
 552                                         );
 553                                 }
 554
 555                                 goaway($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 }