mod/dfrn_poll.php

   1 <?php
   2 /**
   3  * @file mod/dfrn_poll.php
   4  */
   5 use Friendica\App;
   6 use Friendica\Core\Config;
   7 use Friendica\Core\System;
   8 use Friendica\Database\DBM;
   9 use Friendica\Module\Login;
  10 use Friendica\Protocol\DFRN;
  11 use Friendica\Protocol\OStatus;
  12
  13 require_once 'include/items.php';
  14
  15 function dfrn_poll_init(App $a) {
  16         Login::sessionAuth();
  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 = $a->argv[1];
  31                 header("Content-type: application/atom+xml");
  32                 echo OStatus::feed($a, $nickname, $last_update, 10);
  33                 killme();
  34         }
  35
  36         $direction = (-1);
  37
  38
  39         if(strpos($dfrn_id,':') == 1) {
  40                 $direction = intval(substr($dfrn_id,0,1));
  41                 $dfrn_id   = substr($dfrn_id,2);
  42         }
  43
  44         $hidewall = false;
  45
  46         if(($dfrn_id === '') && (! x($_POST,'dfrn_id'))) {
  47                 if((Config::get('system','block_public')) && (! local_user()) && (! remote_user())) {
  48                         http_status_exit(403);
  49                 }
  50
  51                 $user = '';
  52                 if($a->argc > 1) {
  53                         $r = q("SELECT `hidewall`,`nickname` FROM `user` WHERE `user`.`nickname` = '%s' LIMIT 1",
  54                                 dbesc($a->argv[1])
  55                         );
  56                         if (!$r)
  57                                 http_status_exit(404);
  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
  72                 $sql_extra = '';
  73                 switch($direction) {
  74                         case (-1):
  75                                 $sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", dbesc($dfrn_id),dbesc($dfrn_id));
  76                                 $my_id = $dfrn_id;
  77                                 break;
  78                         case 0:
  79                                 $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
  80                                 $my_id = '1:' . $dfrn_id;
  81                                 break;
  82                         case 1:
  83                                 $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
  84                                 $my_id = '0:' . $dfrn_id;
  85                                 break;
  86                         default:
  87                                 goaway(System::baseUrl());
  88                                 break; // NOTREACHED
  89                 }
  90
  91                 $r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname`
  92                         FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
  93                         WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
  94                         AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
  95                         dbesc($a->argv[1])
  96                 );
  97
  98                 if (DBM::is_result($r)) {
  99
 100                         $s = fetch_url($r[0]['poll'] . '?dfrn_id=' . $my_id . '&type=profile-check');
 101
 102                         logger("dfrn_poll: old profile returns " . $s, LOGGER_DATA);
 103
 104                         if(strlen($s)) {
 105
 106                                 $xml = parse_xml_string($s);
 107
 108                                 if((int) $xml->status == 1) {
 109                                         $_SESSION['authenticated'] = 1;
 110                                         if(! x($_SESSION,'remote'))
 111                                                 $_SESSION['remote'] = array();
 112
 113                                         $_SESSION['remote'][] = array('cid' => $r[0]['id'],'uid' => $r[0]['uid'],'url' => $r[0]['url']);
 114
 115                                         $_SESSION['visitor_id'] = $r[0]['id'];
 116                                         $_SESSION['visitor_home'] = $r[0]['url'];
 117                                         $_SESSION['visitor_handle'] = $r[0]['addr'];
 118                                         $_SESSION['visitor_visiting'] = $r[0]['uid'];
 119                                         if(!$quiet)
 120                                                 info( sprintf(t('%1$s welcomes %2$s'), $r[0]['username'] , $r[0]['name']) . EOL);
 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/' . $profile);
 132                 }
 133                 goaway(System::baseUrl());
 134
 135         }
 136
 137         if($type === 'profile-check' && $dfrn_version < 2.2 ) {
 138
 139                 if((strlen($challenge)) && (strlen($sec))) {
 140
 141                         q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
 142                         $r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1",
 143                                 dbesc($sec)
 144                         );
 145                         if (! DBM::is_result($r)) {
 146                                 xml_status(3, 'No ticket');
 147                                 // NOTREACHED
 148                         }
 149                         $orig_id = $r[0]['dfrn_id'];
 150                         if(strpos($orig_id, ':'))
 151                                 $orig_id = substr($orig_id,2);
 152
 153                         $c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
 154                                 intval($r[0]['cid'])
 155                         );
 156                         if (! DBM::is_result($c)) {
 157                                 xml_status(3, 'No profile');
 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,$contact['prvkey']);
 169                         }
 170                         else {
 171                                 openssl_public_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['pubkey']);
 172                                 openssl_public_decrypt($challenge,$decoded_challenge,$contact['pubkey']);
 173                         }
 174
 175                         $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
 176
 177                         if(strpos($final_dfrn_id,':') == 1)
 178                                 $final_dfrn_id = substr($final_dfrn_id,2);
 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>$sec</sec></dfrn_poll>";
 188                         killme();
 189                         // NOTREACHED
 190                 }
 191                 else {
 192                                 // old protocol
 193
 194                         switch($direction) {
 195                                 case 1:
 196                                         $dfrn_id = '0:' . $dfrn_id;
 197                                         break;
 198                                 case 0:
 199                                         $dfrn_id = '1:' . $dfrn_id;
 200                                         break;
 201                                 default:
 202                                         break;
 203                         }
 204
 205
 206                         q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
 207                         $r = q("SELECT * FROM `profile_check` WHERE `dfrn_id` = '%s' ORDER BY `expire` DESC",
 208                                 dbesc($dfrn_id));
 209                         if (DBM::is_result($r)) {
 210                                 xml_status(1);
 211                                 return; // NOTREACHED
 212                         }
 213                         xml_status(0);
 214                         return; // NOTREACHED
 215                 }
 216         }
 217
 218 }
 219
 220
 221
 222 function dfrn_poll_post(App $a) {
 223
 224         $dfrn_id      = ((x($_POST,'dfrn_id'))      ? $_POST['dfrn_id']              : '');
 225         $challenge    = ((x($_POST,'challenge'))    ? $_POST['challenge']            : '');
 226         $url          = ((x($_POST,'url'))          ? $_POST['url']                  : '');
 227         $sec          = ((x($_POST,'sec'))          ? $_POST['sec']                  : '');
 228         $ptype        = ((x($_POST,'type'))         ? $_POST['type']                 : '');
 229         $dfrn_version = ((x($_POST,'dfrn_version')) ? (float) $_POST['dfrn_version'] : 2.0);
 230         $perm         = ((x($_POST,'perm'))         ? $_POST['perm']                 : 'r');
 231
 232         if($ptype === 'profile-check') {
 233
 234                 if((strlen($challenge)) && (strlen($sec))) {
 235
 236                         logger('dfrn_poll: POST: profile-check');
 237
 238                         q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
 239                         $r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1",
 240                                 dbesc($sec)
 241                         );
 242                         if (! DBM::is_result($r)) {
 243                                 xml_status(3, 'No ticket');
 244                                 // NOTREACHED
 245                         }
 246                         $orig_id = $r[0]['dfrn_id'];
 247                         if(strpos($orig_id, ':'))
 248                                 $orig_id = substr($orig_id,2);
 249
 250                         $c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
 251                                 intval($r[0]['cid'])
 252                         );
 253                         if (! DBM::is_result($c)) {
 254                                 xml_status(3, 'No profile');
 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,$contact['prvkey']);
 266                         }
 267                         else {
 268                                 openssl_public_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['pubkey']);
 269                                 openssl_public_decrypt($challenge,$decoded_challenge,$contact['pubkey']);
 270                         }
 271
 272                         $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
 273
 274                         if(strpos($final_dfrn_id,':') == 1)
 275                                 $final_dfrn_id = substr($final_dfrn_id,2);
 276
 277                         if($final_dfrn_id != $orig_id) {
 278                                 logger('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, LOGGER_DEBUG);
 279                                 // did not decode properly - cannot trust this site
 280                                 xml_status(3, 'Bad decryption');
 281                         }
 282
 283                         header("Content-type: text/xml");
 284                         echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
 285                         killme();
 286                         // NOTREACHED
 287                 }
 288
 289         }
 290
 291         $direction    = (-1);
 292         if(strpos($dfrn_id,':') == 1) {
 293                 $direction = intval(substr($dfrn_id,0,1));
 294                 $dfrn_id   = substr($dfrn_id,2);
 295         }
 296
 297
 298         $r = q("SELECT * FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s' LIMIT 1",
 299                 dbesc($dfrn_id),
 300                 dbesc($challenge)
 301         );
 302
 303         if (! DBM::is_result($r)) {
 304                 killme();
 305         }
 306
 307         $type = $r[0]['type'];
 308         $last_update = $r[0]['last_update'];
 309
 310         $r = q("DELETE FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s'",
 311                 dbesc($dfrn_id),
 312                 dbesc($challenge)
 313         );
 314
 315
 316         $sql_extra = '';
 317         switch($direction) {
 318                 case (-1):
 319                         $sql_extra = sprintf(" AND `issued-id` = '%s' ", dbesc($dfrn_id));
 320                         $my_id = $dfrn_id;
 321                         break;
 322                 case 0:
 323                         $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 324                         $my_id = '1:' . $dfrn_id;
 325                         break;
 326                 case 1:
 327                         $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 328                         $my_id = '0:' . $dfrn_id;
 329                         break;
 330                 default:
 331                         goaway(System::baseUrl());
 332                         break; // NOTREACHED
 333         }
 334
 335
 336         $r = q("SELECT * FROM `contact` WHERE `blocked` = 0 AND `pending` = 0 $sql_extra LIMIT 1");
 337
 338
 339         if (! DBM::is_result($r)) {
 340                 killme();
 341         }
 342
 343         $contact = $r[0];
 344         $owner_uid = $r[0]['uid'];
 345         $contact_id = $r[0]['id'];
 346
 347
 348         if($type === 'reputation' && strlen($url)) {
 349                 $r = q("SELECT * FROM `contact` WHERE `url` = '%s' AND `uid` = %d LIMIT 1",
 350                         dbesc($url),
 351                         intval($owner_uid)
 352                 );
 353                 $reputation = 0;
 354                 $text = '';
 355
 356                 if (DBM::is_result($r)) {
 357                         $reputation = $r[0]['rating'];
 358                         $text = $r[0]['reason'];
 359
 360                         if($r[0]['id'] == $contact_id) {        // inquiring about own reputation not allowed
 361                                 $reputation = 0;
 362                                 $text = '';
 363                         }
 364                 }
 365
 366                 echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
 367                 <reputation>
 368                         <url>$url</url>
 369                         <rating>$reputation</rating>
 370                         <description>$text</description>
 371                 </reputation>
 372                 ";
 373                 killme();
 374                 // NOTREACHED
 375         }
 376         else {
 377
 378                 // Update the writable flag if it changed
 379                 logger('dfrn_poll: post request feed: ' . print_r($_POST,true),LOGGER_DATA);
 380                 if($dfrn_version >= 2.21) {
 381                         if($perm === 'rw')
 382                                 $writable = 1;
 383                         else
 384                                 $writable = 0;
 385
 386                         if($writable !=  $contact['writable']) {
 387                                 q("UPDATE `contact` SET `writable` = %d WHERE `id` = %d",
 388                                         intval($writable),
 389                                         intval($contact_id)
 390                                 );
 391                         }
 392                 }
 393
 394                 header("Content-type: application/atom+xml");
 395                 $o = DFRN::feed($dfrn_id, $a->argv[1], $last_update, $direction);
 396                 echo $o;
 397                 killme();
 398
 399         }
 400 }
 401
 402 function dfrn_poll_content(App $a) {
 403
 404         $dfrn_id         = ((x($_GET,'dfrn_id'))         ? $_GET['dfrn_id']              : '');
 405         $type            = ((x($_GET,'type'))            ? $_GET['type']                 : 'data');
 406         $last_update     = ((x($_GET,'last_update'))     ? $_GET['last_update']          : '');
 407         $destination_url = ((x($_GET,'destination_url')) ? $_GET['destination_url']      : '');
 408         $sec             = ((x($_GET,'sec'))             ? $_GET['sec']                  : '');
 409         $dfrn_version    = ((x($_GET,'dfrn_version'))    ? (float) $_GET['dfrn_version'] : 2.0);
 410         $perm            = ((x($_GET,'perm'))            ? $_GET['perm']                 : 'r');
 411         $quiet           = ((x($_GET,'quiet'))           ? true                          : false);
 412
 413         $direction = (-1);
 414         if(strpos($dfrn_id,':') == 1) {
 415                 $direction = intval(substr($dfrn_id,0,1));
 416                 $dfrn_id = substr($dfrn_id,2);
 417         }
 418
 419
 420         if($dfrn_id != '') {
 421                 // initial communication from external contact
 422                 $hash = random_string();
 423
 424                 $status = 0;
 425
 426                 $r = q("DELETE FROM `challenge` WHERE `expire` < " . intval(time()));
 427
 428                 if($type !== 'profile') {
 429                         $r = q("INSERT INTO `challenge` ( `challenge`, `dfrn-id`, `expire` , `type`, `last_update` )
 430                                 VALUES( '%s', '%s', '%s', '%s', '%s' ) ",
 431                                 dbesc($hash),
 432                                 dbesc($dfrn_id),
 433                                 intval(time() + 60 ),
 434                                 dbesc($type),
 435                                 dbesc($last_update)
 436                         );
 437                 }
 438                 $sql_extra = '';
 439                 switch($direction) {
 440                         case (-1):
 441                                 if($type === 'profile')
 442                                         $sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", dbesc($dfrn_id),dbesc($dfrn_id));
 443                                 else
 444                                         $sql_extra = sprintf(" AND `issued-id` = '%s' ", dbesc($dfrn_id));
 445                                 $my_id = $dfrn_id;
 446                                 break;
 447                         case 0:
 448                                 $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 449                                 $my_id = '1:' . $dfrn_id;
 450                                 break;
 451                         case 1:
 452                                 $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 453                                 $my_id = '0:' . $dfrn_id;
 454                                 break;
 455                         default:
 456                                 goaway(System::baseUrl());
 457                                 break; // NOTREACHED
 458                 }
 459
 460                 $nickname = $a->argv[1];
 461
 462                 $r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname`
 463                         FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
 464                         WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
 465                         AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
 466                         dbesc($nickname)
 467                 );
 468
 469                 if (DBM::is_result($r)) {
 470
 471                         $challenge = '';
 472                         $encrypted_id = '';
 473                         $id_str = $my_id . '.' . mt_rand(1000,9999);
 474
 475                         if(($r[0]['duplex'] && strlen($r[0]['pubkey'])) || (! strlen($r[0]['prvkey']))) {
 476                                 openssl_public_encrypt($hash,$challenge,$r[0]['pubkey']);
 477                                 openssl_public_encrypt($id_str,$encrypted_id,$r[0]['pubkey']);
 478                         }
 479                         else {
 480                                 openssl_private_encrypt($hash,$challenge,$r[0]['prvkey']);
 481                                 openssl_private_encrypt($id_str,$encrypted_id,$r[0]['prvkey']);
 482                         }
 483
 484                         $challenge = bin2hex($challenge);
 485                         $encrypted_id = bin2hex($encrypted_id);
 486                 }
 487                 else {
 488                         $status = 1;
 489                         $challenge = '';
 490                         $encrypted_id = '';
 491                 }
 492
 493                 if(($type === 'profile') && (strlen($sec))) {
 494
 495                         // URL reply
 496
 497                         if($dfrn_version < 2.2) {
 498                                 $s = fetch_url($r[0]['poll']
 499                                         . '?dfrn_id=' . $encrypted_id
 500                                         . '&type=profile-check'
 501                                         . '&dfrn_version=' . DFRN_PROTOCOL_VERSION
 502                                         . '&challenge=' . $challenge
 503                                         . '&sec=' . $sec
 504                                 );
 505                         }
 506                         else {
 507                                 $s = post_url($r[0]['poll'], array(
 508                                         'dfrn_id' => $encrypted_id,
 509                                         'type' => 'profile-check',
 510                                         'dfrn_version' => DFRN_PROTOCOL_VERSION,
 511                                         'challenge' => $challenge,
 512                                         'sec' => $sec
 513                                 ));
 514                         }
 515
 516                         $profile = ((DBM::is_result($r) && $r[0]['nickname']) ? $r[0]['nickname'] : $nickname);
 517
 518                         switch($destination_url) {
 519                                 case 'profile':
 520                                         $dest = System::baseUrl() . '/profile/' . $profile . '?f=&tab=profile';
 521                                         break;
 522                                 case 'photos':
 523                                         $dest = System::baseUrl() . '/photos/' . $profile;
 524                                         break;
 525                                 case 'status':
 526                                 case '':
 527                                         $dest = System::baseUrl() . '/profile/' . $profile;
 528                                         break;
 529                                 default:
 530                                         $appendix = (strstr($destination_url, '?') ? '&f=&redir=1' : '?f=&redir=1');
 531                                         $dest = $destination_url . $appendix;
 532                                         break;
 533                         }
 534
 535                         logger("dfrn_poll: sec profile: " . $s, LOGGER_DATA);
 536
 537                         if(strlen($s) && strstr($s,'<?xml')) {
 538
 539                                 $xml = parse_xml_string($s);
 540
 541                                 logger('dfrn_poll: profile: parsed xml: ' . print_r($xml,true), LOGGER_DATA);
 542
 543                                 logger('dfrn_poll: secure profile: challenge: ' . $xml->challenge . ' expecting ' . $hash);
 544                                 logger('dfrn_poll: secure profile: sec: ' . $xml->sec . ' expecting ' . $sec);
 545
 546
 547                                 if(((int) $xml->status == 0) && ($xml->challenge == $hash)  && ($xml->sec == $sec)) {
 548                                         $_SESSION['authenticated'] = 1;
 549                                         if(! x($_SESSION,'remote'))
 550                                                 $_SESSION['remote'] = array();
 551                                         $_SESSION['remote'][] = array('cid' => $r[0]['id'],'uid' => $r[0]['uid'],'url' => $r[0]['url']);
 552                                         $_SESSION['visitor_id'] = $r[0]['id'];
 553                                         $_SESSION['visitor_home'] = $r[0]['url'];
 554                                         $_SESSION['visitor_visiting'] = $r[0]['uid'];
 555                                         if(!$quiet)
 556                                                 info( sprintf(t('%1$s welcomes %2$s'), $r[0]['username'] , $r[0]['name']) . EOL);
 557                                         // Visitors get 1 day session.
 558                                         $session_id = session_id();
 559                                         $expire = time() + 86400;
 560                                         q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s'",
 561                                                 dbesc($expire),
 562                                                 dbesc($session_id)
 563                                         );
 564                                 }
 565
 566                                 goaway($dest);
 567                         }
 568                         goaway($dest);
 569                         // NOTREACHED
 570
 571                 }
 572                 else {
 573                         // XML reply
 574                         header("Content-type: text/xml");
 575                         echo '<?xml version="1.0" encoding="UTF-8"?>' . "\r\n"
 576                                 . '<dfrn_poll>' . "\r\n"
 577                                 . "\t" . '<status>' . $status . '</status>' . "\r\n"
 578                                 . "\t" . '<dfrn_version>' . DFRN_PROTOCOL_VERSION . '</dfrn_version>' . "\r\n"
 579                                 . "\t" . '<dfrn_id>' . $encrypted_id . '</dfrn_id>' . "\r\n"
 580                                 . "\t" . '<challenge>' . $challenge . '</challenge>' . "\r\n"
 581                                 . '</dfrn_poll>' . "\r\n" ;
 582                         killme();
 583                         // NOTREACHED
 584                 }
 585         }
 586 }