mod/dfrn_poll.php

   1 <?php
   2
   3 use Friendica\App;
   4 use Friendica\Core\System;
   5
   6 require_once('include/items.php');
   7 require_once('include/auth.php');
   8 require_once('include/dfrn.php');
   9 require_once('include/ostatus.php');
  10
  11 function dfrn_poll_init(App $a) {
  12         $dfrn_id         = ((x($_GET,'dfrn_id'))         ? $_GET['dfrn_id']              : '');
  13         $type            = ((x($_GET,'type'))            ? $_GET['type']                 : 'data');
  14         $last_update     = ((x($_GET,'last_update'))     ? $_GET['last_update']          : '');
  15         $destination_url = ((x($_GET,'destination_url')) ? $_GET['destination_url']      : '');
  16         $challenge       = ((x($_GET,'challenge'))       ? $_GET['challenge']            : '');
  17         $sec             = ((x($_GET,'sec'))             ? $_GET['sec']                  : '');
  18         $dfrn_version    = ((x($_GET,'dfrn_version'))    ? (float) $_GET['dfrn_version'] : 2.0);
  19         $perm            = ((x($_GET,'perm'))            ? $_GET['perm']                 : 'r');
  20         $quiet                   = ((x($_GET,'quiet'))                   ? true                                                  : false);
  21
  22         // Possibly it is an OStatus compatible server that requests a user feed
  23         if (($a->argc > 1) && ($dfrn_id == '') && !strstr($_SERVER["HTTP_USER_AGENT"], 'Friendica')) {
  24                 $nickname = $a->argv[1];
  25                 header("Content-type: application/atom+xml");
  26                 echo ostatus::feed($a, $nickname, $last_update, 10);
  27                 killme();
  28         }
  29
  30         $direction = (-1);
  31
  32
  33         if(strpos($dfrn_id,':') == 1) {
  34                 $direction = intval(substr($dfrn_id,0,1));
  35                 $dfrn_id   = substr($dfrn_id,2);
  36         }
  37
  38         $hidewall = false;
  39
  40         if(($dfrn_id === '') && (! x($_POST,'dfrn_id'))) {
  41                 if((get_config('system','block_public')) && (! local_user()) && (! remote_user())) {
  42                         http_status_exit(403);
  43                 }
  44
  45                 $user = '';
  46                 if($a->argc > 1) {
  47                         $r = q("SELECT `hidewall`,`nickname` FROM `user` WHERE `user`.`nickname` = '%s' LIMIT 1",
  48                                 dbesc($a->argv[1])
  49                         );
  50                         if (!$r)
  51                                 http_status_exit(404);
  52
  53                         $hidewall = ($r[0]['hidewall'] && !local_user());
  54
  55                         $user = $r[0]['nickname'];
  56                 }
  57
  58                 logger('dfrn_poll: public feed request from ' . $_SERVER['REMOTE_ADDR'] . ' for ' . $user);
  59                 header("Content-type: application/atom+xml");
  60                 echo dfrn::feed('', $user,$last_update, 0, $hidewall);
  61                 killme();
  62         }
  63
  64         if(($type === 'profile') && (! strlen($sec))) {
  65
  66                 $sql_extra = '';
  67                 switch($direction) {
  68                         case (-1):
  69                                 $sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", dbesc($dfrn_id),dbesc($dfrn_id));
  70                                 $my_id = $dfrn_id;
  71                                 break;
  72                         case 0:
  73                                 $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
  74                                 $my_id = '1:' . $dfrn_id;
  75                                 break;
  76                         case 1:
  77                                 $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
  78                                 $my_id = '0:' . $dfrn_id;
  79                                 break;
  80                         default:
  81                                 goaway(System::baseUrl());
  82                                 break; // NOTREACHED
  83                 }
  84
  85                 $r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname`
  86                         FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
  87                         WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
  88                         AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
  89                         dbesc($a->argv[1])
  90                 );
  91
  92                 if (dbm::is_result($r)) {
  93
  94                         $s = fetch_url($r[0]['poll'] . '?dfrn_id=' . $my_id . '&type=profile-check');
  95
  96                         logger("dfrn_poll: old profile returns " . $s, LOGGER_DATA);
  97
  98                         if(strlen($s)) {
  99
 100                                 $xml = parse_xml_string($s);
 101
 102                                 if((int) $xml->status == 1) {
 103                                         $_SESSION['authenticated'] = 1;
 104                                         if(! x($_SESSION,'remote'))
 105                                                 $_SESSION['remote'] = array();
 106
 107                                         $_SESSION['remote'][] = array('cid' => $r[0]['id'],'uid' => $r[0]['uid'],'url' => $r[0]['url']);
 108
 109                                         $_SESSION['visitor_id'] = $r[0]['id'];
 110                                         $_SESSION['visitor_home'] = $r[0]['url'];
 111                                         $_SESSION['visitor_handle'] = $r[0]['addr'];
 112                                         $_SESSION['visitor_visiting'] = $r[0]['uid'];
 113                                         if(!$quiet)
 114                                                 info( sprintf(t('%1$s welcomes %2$s'), $r[0]['username'] , $r[0]['name']) . EOL);
 115                                         // Visitors get 1 day session.
 116                                         $session_id = session_id();
 117                                         $expire = time() + 86400;
 118                                         q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s'",
 119                                                 dbesc($expire),
 120                                                 dbesc($session_id)
 121                                         );
 122                                 }
 123                         }
 124                         $profile = $r[0]['nickname'];
 125                         goaway((strlen($destination_url)) ? $destination_url : System::baseUrl() . '/profile/' . $profile);
 126                 }
 127                 goaway(System::baseUrl());
 128
 129         }
 130
 131         if($type === 'profile-check' && $dfrn_version < 2.2 ) {
 132
 133                 if((strlen($challenge)) && (strlen($sec))) {
 134
 135                         q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
 136                         $r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1",
 137                                 dbesc($sec)
 138                         );
 139                         if (! dbm::is_result($r)) {
 140                                 xml_status(3, 'No ticket');
 141                                 // NOTREACHED
 142                         }
 143                         $orig_id = $r[0]['dfrn_id'];
 144                         if(strpos($orig_id, ':'))
 145                                 $orig_id = substr($orig_id,2);
 146
 147                         $c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
 148                                 intval($r[0]['cid'])
 149                         );
 150                         if (! dbm::is_result($c)) {
 151                                 xml_status(3, 'No profile');
 152                         }
 153                         $contact = $c[0];
 154
 155                         $sent_dfrn_id = hex2bin($dfrn_id);
 156                         $challenge    = hex2bin($challenge);
 157
 158                         $final_dfrn_id = '';
 159
 160                         if(($contact['duplex']) && strlen($contact['prvkey'])) {
 161                                 openssl_private_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['prvkey']);
 162                                 openssl_private_decrypt($challenge,$decoded_challenge,$contact['prvkey']);
 163                         }
 164                         else {
 165                                 openssl_public_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['pubkey']);
 166                                 openssl_public_decrypt($challenge,$decoded_challenge,$contact['pubkey']);
 167                         }
 168
 169                         $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
 170
 171                         if(strpos($final_dfrn_id,':') == 1)
 172                                 $final_dfrn_id = substr($final_dfrn_id,2);
 173
 174                         if($final_dfrn_id != $orig_id) {
 175                                 logger('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, LOGGER_DEBUG);
 176                                 // did not decode properly - cannot trust this site
 177                                 xml_status(3, 'Bad decryption');
 178                         }
 179
 180                         header("Content-type: text/xml");
 181                         echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
 182                         killme();
 183                         // NOTREACHED
 184                 }
 185                 else {
 186                                 // old protocol
 187
 188                         switch($direction) {
 189                                 case 1:
 190                                         $dfrn_id = '0:' . $dfrn_id;
 191                                         break;
 192                                 case 0:
 193                                         $dfrn_id = '1:' . $dfrn_id;
 194                                         break;
 195                                 default:
 196                                         break;
 197                         }
 198
 199
 200                         q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
 201                         $r = q("SELECT * FROM `profile_check` WHERE `dfrn_id` = '%s' ORDER BY `expire` DESC",
 202                                 dbesc($dfrn_id));
 203                         if (dbm::is_result($r)) {
 204                                 xml_status(1);
 205                                 return; // NOTREACHED
 206                         }
 207                         xml_status(0);
 208                         return; // NOTREACHED
 209                 }
 210         }
 211
 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
 228                 if((strlen($challenge)) && (strlen($sec))) {
 229
 230                         logger('dfrn_poll: POST: profile-check');
 231
 232                         q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
 233                         $r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1",
 234                                 dbesc($sec)
 235                         );
 236                         if (! dbm::is_result($r)) {
 237                                 xml_status(3, 'No ticket');
 238                                 // NOTREACHED
 239                         }
 240                         $orig_id = $r[0]['dfrn_id'];
 241                         if(strpos($orig_id, ':'))
 242                                 $orig_id = substr($orig_id,2);
 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                         $contact = $c[0];
 251
 252                         $sent_dfrn_id = hex2bin($dfrn_id);
 253                         $challenge    = hex2bin($challenge);
 254
 255                         $final_dfrn_id = '';
 256
 257                         if(($contact['duplex']) && strlen($contact['prvkey'])) {
 258                                 openssl_private_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['prvkey']);
 259                                 openssl_private_decrypt($challenge,$decoded_challenge,$contact['prvkey']);
 260                         }
 261                         else {
 262                                 openssl_public_decrypt($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                         if($final_dfrn_id != $orig_id) {
 272                                 logger('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, LOGGER_DEBUG);
 273                                 // did not decode properly - cannot trust this site
 274                                 xml_status(3, 'Bad decryption');
 275                         }
 276
 277                         header("Content-type: text/xml");
 278                         echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
 279                         killme();
 280                         // NOTREACHED
 281                 }
 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
 292         $r = q("SELECT * FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s' LIMIT 1",
 293                 dbesc($dfrn_id),
 294                 dbesc($challenge)
 295         );
 296
 297         if (! dbm::is_result($r)) {
 298                 killme();
 299         }
 300
 301         $type = $r[0]['type'];
 302         $last_update = $r[0]['last_update'];
 303
 304         $r = q("DELETE FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s'",
 305                 dbesc($dfrn_id),
 306                 dbesc($challenge)
 307         );
 308
 309
 310         $sql_extra = '';
 311         switch($direction) {
 312                 case (-1):
 313                         $sql_extra = sprintf(" AND `issued-id` = '%s' ", dbesc($dfrn_id));
 314                         $my_id = $dfrn_id;
 315                         break;
 316                 case 0:
 317                         $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 318                         $my_id = '1:' . $dfrn_id;
 319                         break;
 320                 case 1:
 321                         $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 322                         $my_id = '0:' . $dfrn_id;
 323                         break;
 324                 default:
 325                         goaway(System::baseUrl());
 326                         break; // NOTREACHED
 327         }
 328
 329
 330         $r = q("SELECT * FROM `contact` WHERE `blocked` = 0 AND `pending` = 0 $sql_extra LIMIT 1");
 331
 332
 333         if (! dbm::is_result($r)) {
 334                 killme();
 335         }
 336
 337         $contact = $r[0];
 338         $owner_uid = $r[0]['uid'];
 339         $contact_id = $r[0]['id'];
 340
 341
 342         if($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         }
 370         else {
 371
 372                 // Update the writable flag if it changed
 373                 logger('dfrn_poll: post request feed: ' . print_r($_POST,true),LOGGER_DATA);
 374                 if($dfrn_version >= 2.21) {
 375                         if($perm === 'rw')
 376                                 $writable = 1;
 377                         else
 378                                 $writable = 0;
 379
 380                         if($writable !=  $contact['writable']) {
 381                                 q("UPDATE `contact` SET `writable` = %d WHERE `id` = %d",
 382                                         intval($writable),
 383                                         intval($contact_id)
 384                                 );
 385                         }
 386                 }
 387
 388                 header("Content-type: application/atom+xml");
 389                 $o = dfrn::feed($dfrn_id, $a->argv[1], $last_update, $direction);
 390                 echo $o;
 391                 killme();
 392
 393         }
 394 }
 395
 396 function dfrn_poll_content(App $a) {
 397
 398         $dfrn_id         = ((x($_GET,'dfrn_id'))         ? $_GET['dfrn_id']              : '');
 399         $type            = ((x($_GET,'type'))            ? $_GET['type']                 : 'data');
 400         $last_update     = ((x($_GET,'last_update'))     ? $_GET['last_update']          : '');
 401         $destination_url = ((x($_GET,'destination_url')) ? $_GET['destination_url']      : '');
 402         $sec             = ((x($_GET,'sec'))             ? $_GET['sec']                  : '');
 403         $dfrn_version    = ((x($_GET,'dfrn_version'))    ? (float) $_GET['dfrn_version'] : 2.0);
 404         $perm            = ((x($_GET,'perm'))            ? $_GET['perm']                 : 'r');
 405         $quiet           = ((x($_GET,'quiet'))           ? true                          : false);
 406
 407         $direction = (-1);
 408         if(strpos($dfrn_id,':') == 1) {
 409                 $direction = intval(substr($dfrn_id,0,1));
 410                 $dfrn_id = substr($dfrn_id,2);
 411         }
 412
 413
 414         if($dfrn_id != '') {
 415                 // initial communication from external contact
 416                 $hash = random_string();
 417
 418                 $status = 0;
 419
 420                 $r = q("DELETE FROM `challenge` WHERE `expire` < " . intval(time()));
 421
 422                 if($type !== 'profile') {
 423                         $r = q("INSERT INTO `challenge` ( `challenge`, `dfrn-id`, `expire` , `type`, `last_update` )
 424                                 VALUES( '%s', '%s', '%s', '%s', '%s' ) ",
 425                                 dbesc($hash),
 426                                 dbesc($dfrn_id),
 427                                 intval(time() + 60 ),
 428                                 dbesc($type),
 429                                 dbesc($last_update)
 430                         );
 431                 }
 432                 $sql_extra = '';
 433                 switch($direction) {
 434                         case (-1):
 435                                 if($type === 'profile')
 436                                         $sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", dbesc($dfrn_id),dbesc($dfrn_id));
 437                                 else
 438                                         $sql_extra = sprintf(" AND `issued-id` = '%s' ", dbesc($dfrn_id));
 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
 463                 if (dbm::is_result($r)) {
 464
 465                         $challenge = '';
 466                         $encrypted_id = '';
 467                         $id_str = $my_id . '.' . mt_rand(1000,9999);
 468
 469                         if(($r[0]['duplex'] && strlen($r[0]['pubkey'])) || (! strlen($r[0]['prvkey']))) {
 470                                 openssl_public_encrypt($hash,$challenge,$r[0]['pubkey']);
 471                                 openssl_public_encrypt($id_str,$encrypted_id,$r[0]['pubkey']);
 472                         }
 473                         else {
 474                                 openssl_private_encrypt($hash,$challenge,$r[0]['prvkey']);
 475                                 openssl_private_encrypt($id_str,$encrypted_id,$r[0]['prvkey']);
 476                         }
 477
 478                         $challenge = bin2hex($challenge);
 479                         $encrypted_id = bin2hex($encrypted_id);
 480                 }
 481                 else {
 482                         $status = 1;
 483                         $challenge = '';
 484                         $encrypted_id = '';
 485                 }
 486
 487                 if(($type === 'profile') && (strlen($sec))) {
 488
 489                         // URL reply
 490
 491                         if($dfrn_version < 2.2) {
 492                                 $s = fetch_url($r[0]['poll']
 493                                         . '?dfrn_id=' . $encrypted_id
 494                                         . '&type=profile-check'
 495                                         . '&dfrn_version=' . DFRN_PROTOCOL_VERSION
 496                                         . '&challenge=' . $challenge
 497                                         . '&sec=' . $sec
 498                                 );
 499                         }
 500                         else {
 501                                 $s = post_url($r[0]['poll'], array(
 502                                         'dfrn_id' => $encrypted_id,
 503                                         'type' => 'profile-check',
 504                                         'dfrn_version' => DFRN_PROTOCOL_VERSION,
 505                                         'challenge' => $challenge,
 506                                         'sec' => $sec
 507                                 ));
 508                         }
 509
 510                         $profile = ((dbm::is_result($r) && $r[0]['nickname']) ? $r[0]['nickname'] : $nickname);
 511
 512                         switch($destination_url) {
 513                                 case 'profile':
 514                                         $dest = System::baseUrl() . '/profile/' . $profile . '?f=&tab=profile';
 515                                         break;
 516                                 case 'photos':
 517                                         $dest = System::baseUrl() . '/photos/' . $profile;
 518                                         break;
 519                                 case 'status':
 520                                 case '':
 521                                         $dest = System::baseUrl() . '/profile/' . $profile;
 522                                         break;
 523                                 default:
 524                                         $appendix = (strstr($destination_url, '?') ? '&f=&redir=1' : '?f=&redir=1');
 525                                         $dest = $destination_url . $appendix;
 526                                         break;
 527                         }
 528
 529                         logger("dfrn_poll: sec profile: " . $s, LOGGER_DATA);
 530
 531                         if(strlen($s) && strstr($s,'<?xml')) {
 532
 533                                 $xml = parse_xml_string($s);
 534
 535                                 logger('dfrn_poll: profile: parsed xml: ' . print_r($xml,true), LOGGER_DATA);
 536
 537                                 logger('dfrn_poll: secure profile: challenge: ' . $xml->challenge . ' expecting ' . $hash);
 538                                 logger('dfrn_poll: secure profile: sec: ' . $xml->sec . ' expecting ' . $sec);
 539
 540
 541                                 if(((int) $xml->status == 0) && ($xml->challenge == $hash)  && ($xml->sec == $sec)) {
 542                                         $_SESSION['authenticated'] = 1;
 543                                         if(! x($_SESSION,'remote'))
 544                                                 $_SESSION['remote'] = array();
 545                                         $_SESSION['remote'][] = array('cid' => $r[0]['id'],'uid' => $r[0]['uid'],'url' => $r[0]['url']);
 546                                         $_SESSION['visitor_id'] = $r[0]['id'];
 547                                         $_SESSION['visitor_home'] = $r[0]['url'];
 548                                         $_SESSION['visitor_visiting'] = $r[0]['uid'];
 549                                         if(!$quiet)
 550                                                 info( sprintf(t('%1$s welcomes %2$s'), $r[0]['username'] , $r[0]['name']) . EOL);
 551                                         // Visitors get 1 day session.
 552                                         $session_id = session_id();
 553                                         $expire = time() + 86400;
 554                                         q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s'",
 555                                                 dbesc($expire),
 556                                                 dbesc($session_id)
 557                                         );
 558                                 }
 559
 560                                 goaway($dest);
 561                         }
 562                         goaway($dest);
 563                         // NOTREACHED
 564
 565                 }
 566                 else {
 567                         // XML reply
 568                         header("Content-type: text/xml");
 569                         echo '<?xml version="1.0" encoding="UTF-8"?>' . "\r\n"
 570                                 . '<dfrn_poll>' . "\r\n"
 571                                 . "\t" . '<status>' . $status . '</status>' . "\r\n"
 572                                 . "\t" . '<dfrn_version>' . DFRN_PROTOCOL_VERSION . '</dfrn_version>' . "\r\n"
 573                                 . "\t" . '<dfrn_id>' . $encrypted_id . '</dfrn_id>' . "\r\n"
 574                                 . "\t" . '<challenge>' . $challenge . '</challenge>' . "\r\n"
 575                                 . '</dfrn_poll>' . "\r\n" ;
 576                         killme();
 577                         // NOTREACHED
 578                 }
 579         }
 580 }