mod/dfrn_poll.php

   1 <?php
   2
   3 use Friendica\App;
   4
   5 require_once('include/items.php');
   6 require_once('include/auth.php');
   7 require_once('include/dfrn.php');
   8 require_once('include/ostatus.php');
   9
  10 function dfrn_poll_init(App $a) {
  11         $dfrn_id         = ((x($_GET,'dfrn_id'))         ? $_GET['dfrn_id']              : '');
  12         $type            = ((x($_GET,'type'))            ? $_GET['type']                 : 'data');
  13         $last_update     = ((x($_GET,'last_update'))     ? $_GET['last_update']          : '');
  14         $destination_url = ((x($_GET,'destination_url')) ? $_GET['destination_url']      : '');
  15         $challenge       = ((x($_GET,'challenge'))       ? $_GET['challenge']            : '');
  16         $sec             = ((x($_GET,'sec'))             ? $_GET['sec']                  : '');
  17         $dfrn_version    = ((x($_GET,'dfrn_version'))    ? (float) $_GET['dfrn_version'] : 2.0);
  18         $perm            = ((x($_GET,'perm'))            ? $_GET['perm']                 : 'r');
  19         $quiet                   = ((x($_GET,'quiet'))                   ? true                                                  : false);
  20
  21         // Possibly it is an OStatus compatible server that requests a user feed
  22         if (($a->argc > 1) && ($dfrn_id == '') && !strstr($_SERVER["HTTP_USER_AGENT"], 'Friendica')) {
  23                 $nickname = $a->argv[1];
  24                 header("Content-type: application/atom+xml");
  25                 echo ostatus::feed($a, $nickname, $last_update, 10);
  26                 killme();
  27         }
  28
  29         $direction = (-1);
  30
  31
  32         if(strpos($dfrn_id,':') == 1) {
  33                 $direction = intval(substr($dfrn_id,0,1));
  34                 $dfrn_id   = substr($dfrn_id,2);
  35         }
  36
  37         $hidewall = false;
  38
  39         if(($dfrn_id === '') && (! x($_POST,'dfrn_id'))) {
  40                 if((get_config('system','block_public')) && (! local_user()) && (! remote_user())) {
  41                         http_status_exit(403);
  42                 }
  43
  44                 $user = '';
  45                 if($a->argc > 1) {
  46                         $r = q("SELECT `hidewall`,`nickname` FROM `user` WHERE `user`.`nickname` = '%s' LIMIT 1",
  47                                 dbesc($a->argv[1])
  48                         );
  49                         if (!$r)
  50                                 http_status_exit(404);
  51
  52                         $hidewall = ($r[0]['hidewall'] && !local_user());
  53
  54                         $user = $r[0]['nickname'];
  55                 }
  56
  57                 logger('dfrn_poll: public feed request from ' . $_SERVER['REMOTE_ADDR'] . ' for ' . $user);
  58                 header("Content-type: application/atom+xml");
  59                 echo dfrn::feed('', $user,$last_update, 0, $hidewall);
  60                 killme();
  61         }
  62
  63         if(($type === 'profile') && (! strlen($sec))) {
  64
  65                 $sql_extra = '';
  66                 switch($direction) {
  67                         case (-1):
  68                                 $sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", dbesc($dfrn_id),dbesc($dfrn_id));
  69                                 $my_id = $dfrn_id;
  70                                 break;
  71                         case 0:
  72                                 $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
  73                                 $my_id = '1:' . $dfrn_id;
  74                                 break;
  75                         case 1:
  76                                 $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
  77                                 $my_id = '0:' . $dfrn_id;
  78                                 break;
  79                         default:
  80                                 goaway(z_root());
  81                                 break; // NOTREACHED
  82                 }
  83
  84                 $r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname`
  85                         FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
  86                         WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
  87                         AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
  88                         dbesc($a->argv[1])
  89                 );
  90
  91                 if (dbm::is_result($r)) {
  92
  93                         $s = fetch_url($r[0]['poll'] . '?dfrn_id=' . $my_id . '&type=profile-check');
  94
  95                         logger("dfrn_poll: old profile returns " . $s, LOGGER_DATA);
  96
  97                         if(strlen($s)) {
  98
  99                                 $xml = parse_xml_string($s);
 100
 101                                 if((int) $xml->status == 1) {
 102                                         $_SESSION['authenticated'] = 1;
 103                                         if(! x($_SESSION,'remote'))
 104                                                 $_SESSION['remote'] = array();
 105
 106                                         $_SESSION['remote'][] = array('cid' => $r[0]['id'],'uid' => $r[0]['uid'],'url' => $r[0]['url']);
 107
 108                                         $_SESSION['visitor_id'] = $r[0]['id'];
 109                                         $_SESSION['visitor_home'] = $r[0]['url'];
 110                                         $_SESSION['visitor_handle'] = $r[0]['addr'];
 111                                         $_SESSION['visitor_visiting'] = $r[0]['uid'];
 112                                         if(!$quiet)
 113                                                 info( sprintf(t('%1$s welcomes %2$s'), $r[0]['username'] , $r[0]['name']) . EOL);
 114                                         // Visitors get 1 day session.
 115                                         $session_id = session_id();
 116                                         $expire = time() + 86400;
 117                                         q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s'",
 118                                                 dbesc($expire),
 119                                                 dbesc($session_id)
 120                                         );
 121                                 }
 122                         }
 123                         $profile = $r[0]['nickname'];
 124                         goaway((strlen($destination_url)) ? $destination_url : App::get_baseurl() . '/profile/' . $profile);
 125                 }
 126                 goaway(z_root());
 127
 128         }
 129
 130         if($type === 'profile-check' && $dfrn_version < 2.2 ) {
 131
 132                 if((strlen($challenge)) && (strlen($sec))) {
 133
 134                         q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
 135                         $r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1",
 136                                 dbesc($sec)
 137                         );
 138                         if (! dbm::is_result($r)) {
 139                                 xml_status(3, 'No ticket');
 140                                 // NOTREACHED
 141                         }
 142                         $orig_id = $r[0]['dfrn_id'];
 143                         if(strpos($orig_id, ':'))
 144                                 $orig_id = substr($orig_id,2);
 145
 146                         $c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
 147                                 intval($r[0]['cid'])
 148                         );
 149                         if (! dbm::is_result($c)) {
 150                                 xml_status(3, 'No profile');
 151                         }
 152                         $contact = $c[0];
 153
 154                         $sent_dfrn_id = hex2bin($dfrn_id);
 155                         $challenge    = hex2bin($challenge);
 156
 157                         $final_dfrn_id = '';
 158
 159                         if(($contact['duplex']) && strlen($contact['prvkey'])) {
 160                                 openssl_private_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['prvkey']);
 161                                 openssl_private_decrypt($challenge,$decoded_challenge,$contact['prvkey']);
 162                         }
 163                         else {
 164                                 openssl_public_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['pubkey']);
 165                                 openssl_public_decrypt($challenge,$decoded_challenge,$contact['pubkey']);
 166                         }
 167
 168                         $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
 169
 170                         if(strpos($final_dfrn_id,':') == 1)
 171                                 $final_dfrn_id = substr($final_dfrn_id,2);
 172
 173                         if($final_dfrn_id != $orig_id) {
 174                                 logger('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, LOGGER_DEBUG);
 175                                 // did not decode properly - cannot trust this site
 176                                 xml_status(3, 'Bad decryption');
 177                         }
 178
 179                         header("Content-type: text/xml");
 180                         echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
 181                         killme();
 182                         // NOTREACHED
 183                 }
 184                 else {
 185                                 // old protocol
 186
 187                         switch($direction) {
 188                                 case 1:
 189                                         $dfrn_id = '0:' . $dfrn_id;
 190                                         break;
 191                                 case 0:
 192                                         $dfrn_id = '1:' . $dfrn_id;
 193                                         break;
 194                                 default:
 195                                         break;
 196                         }
 197
 198
 199                         q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
 200                         $r = q("SELECT * FROM `profile_check` WHERE `dfrn_id` = '%s' ORDER BY `expire` DESC",
 201                                 dbesc($dfrn_id));
 202                         if (dbm::is_result($r)) {
 203                                 xml_status(1);
 204                                 return; // NOTREACHED
 205                         }
 206                         xml_status(0);
 207                         return; // NOTREACHED
 208                 }
 209         }
 210
 211 }
 212
 213
 214
 215 function dfrn_poll_post(App $a) {
 216
 217         $dfrn_id      = ((x($_POST,'dfrn_id'))      ? $_POST['dfrn_id']              : '');
 218         $challenge    = ((x($_POST,'challenge'))    ? $_POST['challenge']            : '');
 219         $url          = ((x($_POST,'url'))          ? $_POST['url']                  : '');
 220         $sec          = ((x($_POST,'sec'))          ? $_POST['sec']                  : '');
 221         $ptype        = ((x($_POST,'type'))         ? $_POST['type']                 : '');
 222         $dfrn_version = ((x($_POST,'dfrn_version')) ? (float) $_POST['dfrn_version'] : 2.0);
 223         $perm         = ((x($_POST,'perm'))         ? $_POST['perm']                 : 'r');
 224
 225         if($ptype === 'profile-check') {
 226
 227                 if((strlen($challenge)) && (strlen($sec))) {
 228
 229                         logger('dfrn_poll: POST: profile-check');
 230
 231                         q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
 232                         $r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1",
 233                                 dbesc($sec)
 234                         );
 235                         if (! dbm::is_result($r)) {
 236                                 xml_status(3, 'No ticket');
 237                                 // NOTREACHED
 238                         }
 239                         $orig_id = $r[0]['dfrn_id'];
 240                         if(strpos($orig_id, ':'))
 241                                 $orig_id = substr($orig_id,2);
 242
 243                         $c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
 244                                 intval($r[0]['cid'])
 245                         );
 246                         if (! dbm::is_result($c)) {
 247                                 xml_status(3, 'No profile');
 248                         }
 249                         $contact = $c[0];
 250
 251                         $sent_dfrn_id = hex2bin($dfrn_id);
 252                         $challenge    = hex2bin($challenge);
 253
 254                         $final_dfrn_id = '';
 255
 256                         if(($contact['duplex']) && strlen($contact['prvkey'])) {
 257                                 openssl_private_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['prvkey']);
 258                                 openssl_private_decrypt($challenge,$decoded_challenge,$contact['prvkey']);
 259                         }
 260                         else {
 261                                 openssl_public_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['pubkey']);
 262                                 openssl_public_decrypt($challenge,$decoded_challenge,$contact['pubkey']);
 263                         }
 264
 265                         $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
 266
 267                         if(strpos($final_dfrn_id,':') == 1)
 268                                 $final_dfrn_id = substr($final_dfrn_id,2);
 269
 270                         if($final_dfrn_id != $orig_id) {
 271                                 logger('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, LOGGER_DEBUG);
 272                                 // did not decode properly - cannot trust this site
 273                                 xml_status(3, 'Bad decryption');
 274                         }
 275
 276                         header("Content-type: text/xml");
 277                         echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
 278                         killme();
 279                         // NOTREACHED
 280                 }
 281
 282         }
 283
 284         $direction    = (-1);
 285         if(strpos($dfrn_id,':') == 1) {
 286                 $direction = intval(substr($dfrn_id,0,1));
 287                 $dfrn_id   = substr($dfrn_id,2);
 288         }
 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(z_root());
 325                         break; // NOTREACHED
 326         }
 327
 328
 329         $r = q("SELECT * FROM `contact` WHERE `blocked` = 0 AND `pending` = 0 $sql_extra LIMIT 1");
 330
 331
 332         if (! dbm::is_result($r)) {
 333                 killme();
 334         }
 335
 336         $contact = $r[0];
 337         $owner_uid = $r[0]['uid'];
 338         $contact_id = $r[0]['id'];
 339
 340
 341         if($type === 'reputation' && strlen($url)) {
 342                 $r = q("SELECT * FROM `contact` WHERE `url` = '%s' AND `uid` = %d LIMIT 1",
 343                         dbesc($url),
 344                         intval($owner_uid)
 345                 );
 346                 $reputation = 0;
 347                 $text = '';
 348
 349                 if (dbm::is_result($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         }
 369         else {
 370
 371                 // Update the writable flag if it changed
 372                 logger('dfrn_poll: post request feed: ' . print_r($_POST,true),LOGGER_DATA);
 373                 if($dfrn_version >= 2.21) {
 374                         if($perm === 'rw')
 375                                 $writable = 1;
 376                         else
 377                                 $writable = 0;
 378
 379                         if($writable !=  $contact['writable']) {
 380                                 q("UPDATE `contact` SET `writable` = %d WHERE `id` = %d",
 381                                         intval($writable),
 382                                         intval($contact_id)
 383                                 );
 384                         }
 385                 }
 386
 387                 header("Content-type: application/atom+xml");
 388                 $o = dfrn::feed($dfrn_id, $a->argv[1], $last_update, $direction);
 389                 echo $o;
 390                 killme();
 391
 392         }
 393 }
 394
 395 function dfrn_poll_content(App $a) {
 396
 397         $dfrn_id         = ((x($_GET,'dfrn_id'))         ? $_GET['dfrn_id']              : '');
 398         $type            = ((x($_GET,'type'))            ? $_GET['type']                 : 'data');
 399         $last_update     = ((x($_GET,'last_update'))     ? $_GET['last_update']          : '');
 400         $destination_url = ((x($_GET,'destination_url')) ? $_GET['destination_url']      : '');
 401         $sec             = ((x($_GET,'sec'))             ? $_GET['sec']                  : '');
 402         $dfrn_version    = ((x($_GET,'dfrn_version'))    ? (float) $_GET['dfrn_version'] : 2.0);
 403         $perm            = ((x($_GET,'perm'))            ? $_GET['perm']                 : 'r');
 404         $quiet           = ((x($_GET,'quiet'))           ? true                          : false);
 405
 406         $direction = (-1);
 407         if(strpos($dfrn_id,':') == 1) {
 408                 $direction = intval(substr($dfrn_id,0,1));
 409                 $dfrn_id = substr($dfrn_id,2);
 410         }
 411
 412
 413         if($dfrn_id != '') {
 414                 // initial communication from external contact
 415                 $hash = random_string();
 416
 417                 $status = 0;
 418
 419                 $r = q("DELETE FROM `challenge` WHERE `expire` < " . intval(time()));
 420
 421                 if($type !== 'profile') {
 422                         $r = q("INSERT INTO `challenge` ( `challenge`, `dfrn-id`, `expire` , `type`, `last_update` )
 423                                 VALUES( '%s', '%s', '%s', '%s', '%s' ) ",
 424                                 dbesc($hash),
 425                                 dbesc($dfrn_id),
 426                                 intval(time() + 60 ),
 427                                 dbesc($type),
 428                                 dbesc($last_update)
 429                         );
 430                 }
 431                 $sql_extra = '';
 432                 switch($direction) {
 433                         case (-1):
 434                                 if($type === 'profile')
 435                                         $sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", dbesc($dfrn_id),dbesc($dfrn_id));
 436                                 else
 437                                         $sql_extra = sprintf(" AND `issued-id` = '%s' ", dbesc($dfrn_id));
 438                                 $my_id = $dfrn_id;
 439                                 break;
 440                         case 0:
 441                                 $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 442                                 $my_id = '1:' . $dfrn_id;
 443                                 break;
 444                         case 1:
 445                                 $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 446                                 $my_id = '0:' . $dfrn_id;
 447                                 break;
 448                         default:
 449                                 goaway(z_root());
 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' $sql_extra LIMIT 1",
 459                         dbesc($nickname)
 460                 );
 461
 462                 if (dbm::is_result($r)) {
 463
 464                         $challenge = '';
 465                         $encrypted_id = '';
 466                         $id_str = $my_id . '.' . mt_rand(1000,9999);
 467
 468                         if(($r[0]['duplex'] && strlen($r[0]['pubkey'])) || (! strlen($r[0]['prvkey']))) {
 469                                 openssl_public_encrypt($hash,$challenge,$r[0]['pubkey']);
 470                                 openssl_public_encrypt($id_str,$encrypted_id,$r[0]['pubkey']);
 471                         }
 472                         else {
 473                                 openssl_private_encrypt($hash,$challenge,$r[0]['prvkey']);
 474                                 openssl_private_encrypt($id_str,$encrypted_id,$r[0]['prvkey']);
 475                         }
 476
 477                         $challenge = bin2hex($challenge);
 478                         $encrypted_id = bin2hex($encrypted_id);
 479                 }
 480                 else {
 481                         $status = 1;
 482                         $challenge = '';
 483                         $encrypted_id = '';
 484                 }
 485
 486                 if(($type === 'profile') && (strlen($sec))) {
 487
 488                         // URL reply
 489
 490                         if($dfrn_version < 2.2) {
 491                                 $s = fetch_url($r[0]['poll']
 492                                         . '?dfrn_id=' . $encrypted_id
 493                                         . '&type=profile-check'
 494                                         . '&dfrn_version=' . DFRN_PROTOCOL_VERSION
 495                                         . '&challenge=' . $challenge
 496                                         . '&sec=' . $sec
 497                                 );
 498                         }
 499                         else {
 500                                 $s = post_url($r[0]['poll'], array(
 501                                         'dfrn_id' => $encrypted_id,
 502                                         'type' => 'profile-check',
 503                                         'dfrn_version' => DFRN_PROTOCOL_VERSION,
 504                                         'challenge' => $challenge,
 505                                         'sec' => $sec
 506                                 ));
 507                         }
 508
 509                         $profile = ((dbm::is_result($r) && $r[0]['nickname']) ? $r[0]['nickname'] : $nickname);
 510
 511                         switch($destination_url) {
 512                                 case 'profile':
 513                                         $dest = App::get_baseurl() . '/profile/' . $profile . '?f=&tab=profile';
 514                                         break;
 515                                 case 'photos':
 516                                         $dest = App::get_baseurl() . '/photos/' . $profile;
 517                                         break;
 518                                 case 'status':
 519                                 case '':
 520                                         $dest = App::get_baseurl() . '/profile/' . $profile;
 521                                         break;
 522                                 default:
 523                                         $appendix = (strstr($destination_url, '?') ? '&f=&redir=1' : '?f=&redir=1');
 524                                         $dest = $destination_url . $appendix;
 525                                         break;
 526                         }
 527
 528                         logger("dfrn_poll: sec profile: " . $s, LOGGER_DATA);
 529
 530                         if(strlen($s) && strstr($s,'<?xml')) {
 531
 532                                 $xml = parse_xml_string($s);
 533
 534                                 logger('dfrn_poll: profile: parsed xml: ' . print_r($xml,true), LOGGER_DATA);
 535
 536                                 logger('dfrn_poll: secure profile: challenge: ' . $xml->challenge . ' expecting ' . $hash);
 537                                 logger('dfrn_poll: secure profile: sec: ' . $xml->sec . ' expecting ' . $sec);
 538
 539
 540                                 if(((int) $xml->status == 0) && ($xml->challenge == $hash)  && ($xml->sec == $sec)) {
 541                                         $_SESSION['authenticated'] = 1;
 542                                         if(! x($_SESSION,'remote'))
 543                                                 $_SESSION['remote'] = array();
 544                                         $_SESSION['remote'][] = array('cid' => $r[0]['id'],'uid' => $r[0]['uid'],'url' => $r[0]['url']);
 545                                         $_SESSION['visitor_id'] = $r[0]['id'];
 546                                         $_SESSION['visitor_home'] = $r[0]['url'];
 547                                         $_SESSION['visitor_visiting'] = $r[0]['uid'];
 548                                         if(!$quiet)
 549                                                 info( sprintf(t('%1$s welcomes %2$s'), $r[0]['username'] , $r[0]['name']) . EOL);
 550                                         // Visitors get 1 day session.
 551                                         $session_id = session_id();
 552                                         $expire = time() + 86400;
 553                                         q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s'",
 554                                                 dbesc($expire),
 555                                                 dbesc($session_id)
 556                                         );
 557                                 }
 558
 559                                 goaway($dest);
 560                         }
 561                         goaway($dest);
 562                         // NOTREACHED
 563
 564                 }
 565                 else {
 566                         // XML reply
 567                         header("Content-type: text/xml");
 568                         echo '<?xml version="1.0" encoding="UTF-8"?>' . "\r\n"
 569                                 . '<dfrn_poll>' . "\r\n"
 570                                 . "\t" . '<status>' . $status . '</status>' . "\r\n"
 571                                 . "\t" . '<dfrn_version>' . DFRN_PROTOCOL_VERSION . '</dfrn_version>' . "\r\n"
 572                                 . "\t" . '<dfrn_id>' . $encrypted_id . '</dfrn_id>' . "\r\n"
 573                                 . "\t" . '<challenge>' . $challenge . '</challenge>' . "\r\n"
 574                                 . '</dfrn_poll>' . "\r\n" ;
 575                         killme();
 576                         // NOTREACHED
 577                 }
 578         }
 579 }