mod/dfrn_poll.php

   1 <?php
   2
   3 /**
   4  * @file mod/dfrn_poll.php
   5  */
   6 use Friendica\App;
   7 use Friendica\Core\Config;
   8 use Friendica\Core\L10n;
   9 use Friendica\Core\System;
  10 use Friendica\Database\DBM;
  11 use Friendica\Module\Login;
  12 use Friendica\Protocol\DFRN;
  13 use Friendica\Protocol\OStatus;
  14
  15 require_once 'include/items.php';
  16
  17 function dfrn_poll_init(App $a)
  18 {
  19         Login::sessionAuth();
  20
  21         $dfrn_id         = defaults($_GET, 'dfrn_id'        , '');
  22         $type            = defaults($_GET, 'type'           , 'data');
  23         $last_update     = defaults($_GET, 'last_update'    , '');
  24         $destination_url = defaults($_GET, 'destination_url', '');
  25         $challenge       = defaults($_GET, 'challenge'      , '');
  26         $sec             = defaults($_GET, 'sec'            , '');
  27         $dfrn_version    = (float) defaults($_GET, 'dfrn_version'   , 2.0);
  28         $perm            = defaults($_GET, 'perm'           , 'r');
  29         $quiet                   = x($_GET, 'quiet');
  30
  31         // Possibly it is an OStatus compatible server that requests a user feed
  32         if (($a->argc > 1) && ($dfrn_id == '') && !strstr($_SERVER["HTTP_USER_AGENT"], 'Friendica')) {
  33                 $nickname = $a->argv[1];
  34                 header("Content-type: application/atom+xml");
  35                 echo OStatus::feed($nickname, $last_update, 10);
  36                 killme();
  37         }
  38
  39         $direction = -1;
  40
  41         if (strpos($dfrn_id, ':') == 1) {
  42                 $direction = intval(substr($dfrn_id, 0, 1));
  43                 $dfrn_id = substr($dfrn_id, 2);
  44         }
  45
  46         $hidewall = false;
  47
  48         if (($dfrn_id === '') && (!x($_POST, 'dfrn_id'))) {
  49                 if (Config::get('system', 'block_public') && !local_user() && !remote_user()) {
  50                         http_status_exit(403);
  51                 }
  52
  53                 $user = '';
  54                 if ($a->argc > 1) {
  55                         $r = q("SELECT `hidewall`,`nickname` FROM `user` WHERE `user`.`nickname` = '%s' LIMIT 1",
  56                                 dbesc($a->argv[1])
  57                         );
  58                         if (!$r) {
  59                                 http_status_exit(404);
  60                         }
  61
  62                         $hidewall = ($r[0]['hidewall'] && !local_user());
  63
  64                         $user = $r[0]['nickname'];
  65                 }
  66
  67                 logger('dfrn_poll: public feed request from ' . $_SERVER['REMOTE_ADDR'] . ' for ' . $user);
  68                 header("Content-type: application/atom+xml");
  69                 echo DFRN::feed('', $user, $last_update, 0, $hidewall);
  70                 killme();
  71         }
  72
  73         if (($type === 'profile') && (!strlen($sec))) {
  74                 $sql_extra = '';
  75                 switch ($direction) {
  76                         case -1:
  77                                 $sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", dbesc($dfrn_id), dbesc($dfrn_id));
  78                                 $my_id = $dfrn_id;
  79                                 break;
  80                         case 0:
  81                                 $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
  82                                 $my_id = '1:' . $dfrn_id;
  83                                 break;
  84                         case 1:
  85                                 $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
  86                                 $my_id = '0:' . $dfrn_id;
  87                                 break;
  88                         default:
  89                                 goaway(System::baseUrl());
  90                                 break; // NOTREACHED
  91                 }
  92
  93                 $r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname`
  94                         FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
  95                         WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
  96                         AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
  97                         dbesc($a->argv[1])
  98                 );
  99
 100                 if (DBM::is_result($r)) {
 101                         $s = fetch_url($r[0]['poll'] . '?dfrn_id=' . $my_id . '&type=profile-check');
 102
 103                         logger("dfrn_poll: old profile returns " . $s, LOGGER_DATA);
 104
 105                         if (strlen($s)) {
 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'] = [];
 112                                         }
 113
 114                                         $_SESSION['remote'][] = ['cid' => $r[0]['id'], 'uid' => $r[0]['uid'], 'url' => $r[0]['url']];
 115
 116                                         $_SESSION['visitor_id'] = $r[0]['id'];
 117                                         $_SESSION['visitor_home'] = $r[0]['url'];
 118                                         $_SESSION['visitor_handle'] = $r[0]['addr'];
 119                                         $_SESSION['visitor_visiting'] = $r[0]['uid'];
 120                                         if (!$quiet) {
 121                                                 info(L10n::t('%1$s welcomes %2$s', $r[0]['username'], $r[0]['name']) . EOL);
 122                                         }
 123
 124                                         // Visitors get 1 day session.
 125                                         $session_id = session_id();
 126                                         $expire = time() + 86400;
 127                                         q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s'",
 128                                                 dbesc($expire),
 129                                                 dbesc($session_id)
 130                                         );
 131                                 }
 132                         }
 133                         $profile = $r[0]['nickname'];
 134                         goaway((strlen($destination_url)) ? $destination_url : System::baseUrl() . '/profile/' . $profile);
 135                 }
 136                 goaway(System::baseUrl());
 137         }
 138
 139         if ($type === 'profile-check' && $dfrn_version < 2.2) {
 140                 if ((strlen($challenge)) && (strlen($sec))) {
 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
 150                         $orig_id = $r[0]['dfrn_id'];
 151                         if (strpos($orig_id, ':')) {
 152                                 $orig_id = substr($orig_id, 2);
 153                         }
 154
 155                         $c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
 156                                 intval($r[0]['cid'])
 157                         );
 158                         if (!DBM::is_result($c)) {
 159                                 xml_status(3, 'No profile');
 160                         }
 161
 162                         $contact = $c[0];
 163
 164                         $sent_dfrn_id = hex2bin($dfrn_id);
 165                         $challenge = hex2bin($challenge);
 166
 167                         $final_dfrn_id = '';
 168
 169                         if (($contact['duplex']) && strlen($contact['prvkey'])) {
 170                                 openssl_private_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['prvkey']);
 171                                 openssl_private_decrypt($challenge, $decoded_challenge, $contact['prvkey']);
 172                         } else {
 173                                 openssl_public_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['pubkey']);
 174                                 openssl_public_decrypt($challenge, $decoded_challenge, $contact['pubkey']);
 175                         }
 176
 177                         $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
 178
 179                         if (strpos($final_dfrn_id, ':') == 1) {
 180                                 $final_dfrn_id = substr($final_dfrn_id, 2);
 181                         }
 182
 183                         if ($final_dfrn_id != $orig_id) {
 184                                 logger('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, LOGGER_DEBUG);
 185                                 // did not decode properly - cannot trust this site
 186                                 xml_status(3, 'Bad decryption');
 187                         }
 188
 189                         header("Content-type: text/xml");
 190                         echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
 191                         killme();
 192                         // NOTREACHED
 193                 } else {
 194                         // old protocol
 195                         switch ($direction) {
 196                                 case 1:
 197                                         $dfrn_id = '0:' . $dfrn_id;
 198                                         break;
 199                                 case 0:
 200                                         $dfrn_id = '1:' . $dfrn_id;
 201                                         break;
 202                                 default:
 203                                         break;
 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 function dfrn_poll_post(App $a)
 220 {
 221         $dfrn_id      = x($_POST,'dfrn_id')      ? $_POST['dfrn_id']              : '';
 222         $challenge    = x($_POST,'challenge')    ? $_POST['challenge']            : '';
 223         $url          = x($_POST,'url')          ? $_POST['url']                  : '';
 224         $sec          = x($_POST,'sec')          ? $_POST['sec']                  : '';
 225         $ptype        = x($_POST,'type')         ? $_POST['type']                 : '';
 226         $dfrn_version = x($_POST,'dfrn_version') ? (float) $_POST['dfrn_version'] : 2.0;
 227         $perm         = x($_POST,'perm')         ? $_POST['perm']                 : 'r';
 228
 229         if ($ptype === 'profile-check') {
 230                 if (strlen($challenge) && strlen($sec)) {
 231                         logger('dfrn_poll: POST: profile-check');
 232
 233                         q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
 234                         $r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1",
 235                                 dbesc($sec)
 236                         );
 237                         if (!DBM::is_result($r)) {
 238                                 xml_status(3, 'No ticket');
 239                                 // NOTREACHED
 240                         }
 241
 242                         $orig_id = $r[0]['dfrn_id'];
 243                         if (strpos($orig_id, ':')) {
 244                                 $orig_id = substr($orig_id, 2);
 245                         }
 246
 247                         $c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
 248                                 intval($r[0]['cid'])
 249                         );
 250                         if (!DBM::is_result($c)) {
 251                                 xml_status(3, 'No profile');
 252                         }
 253
 254                         $contact = $c[0];
 255
 256                         $sent_dfrn_id = hex2bin($dfrn_id);
 257                         $challenge = hex2bin($challenge);
 258
 259                         $final_dfrn_id = '';
 260
 261                         if ($contact['duplex'] && strlen($contact['prvkey'])) {
 262                                 openssl_private_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['prvkey']);
 263                                 openssl_private_decrypt($challenge, $decoded_challenge, $contact['prvkey']);
 264                         } else {
 265                                 openssl_public_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['pubkey']);
 266                                 openssl_public_decrypt($challenge, $decoded_challenge, $contact['pubkey']);
 267                         }
 268
 269                         $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
 270
 271                         if (strpos($final_dfrn_id, ':') == 1) {
 272                                 $final_dfrn_id = substr($final_dfrn_id, 2);
 273                         }
 274
 275                         if ($final_dfrn_id != $orig_id) {
 276                                 logger('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, LOGGER_DEBUG);
 277                                 // did not decode properly - cannot trust this site
 278                                 xml_status(3, 'Bad decryption');
 279                         }
 280
 281                         header("Content-type: text/xml");
 282                         echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
 283                         killme();
 284                         // NOTREACHED
 285                 }
 286         }
 287
 288         $direction = -1;
 289         if (strpos($dfrn_id, ':') == 1) {
 290                 $direction = intval(substr($dfrn_id, 0, 1));
 291                 $dfrn_id = substr($dfrn_id, 2);
 292         }
 293
 294         $r = q("SELECT * FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s' LIMIT 1",
 295                 dbesc($dfrn_id),
 296                 dbesc($challenge)
 297         );
 298
 299         if (!DBM::is_result($r)) {
 300                 killme();
 301         }
 302
 303         $type = $r[0]['type'];
 304         $last_update = $r[0]['last_update'];
 305
 306         $r = q("DELETE FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s'",
 307                 dbesc($dfrn_id),
 308                 dbesc($challenge)
 309         );
 310
 311
 312         $sql_extra = '';
 313         switch ($direction) {
 314                 case -1:
 315                         $sql_extra = sprintf(" AND `issued-id` = '%s' ", dbesc($dfrn_id));
 316                         $my_id = $dfrn_id;
 317                         break;
 318                 case 0:
 319                         $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 320                         $my_id = '1:' . $dfrn_id;
 321                         break;
 322                 case 1:
 323                         $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 324                         $my_id = '0:' . $dfrn_id;
 325                         break;
 326                 default:
 327                         goaway(System::baseUrl());
 328                         break; // NOTREACHED
 329         }
 330
 331         $r = q("SELECT * FROM `contact` WHERE `blocked` = 0 AND `pending` = 0 $sql_extra LIMIT 1");
 332         if (!DBM::is_result($r)) {
 333                 killme();
 334         }
 335
 336         $contact = $r[0];
 337         $owner_uid = $r[0]['uid'];
 338         $contact_id = $r[0]['id'];
 339
 340         if ($type === 'reputation' && strlen($url)) {
 341                 $r = q("SELECT * FROM `contact` WHERE `url` = '%s' AND `uid` = %d LIMIT 1",
 342                         dbesc($url),
 343                         intval($owner_uid)
 344                 );
 345                 $reputation = 0;
 346                 $text = '';
 347
 348                 if (DBM::is_result($r)) {
 349                         $reputation = $r[0]['rating'];
 350                         $text = $r[0]['reason'];
 351
 352                         if ($r[0]['id'] == $contact_id) { // inquiring about own reputation not allowed
 353                                 $reputation = 0;
 354                                 $text = '';
 355                         }
 356                 }
 357
 358                 echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
 359                 <reputation>
 360                         <url>$url</url>
 361                         <rating>$reputation</rating>
 362                         <description>$text</description>
 363                 </reputation>
 364                 ";
 365                 killme();
 366                 // NOTREACHED
 367         } else {
 368                 // Update the writable flag if it changed
 369                 logger('dfrn_poll: post request feed: ' . print_r($_POST, true), LOGGER_DATA);
 370                 if ($dfrn_version >= 2.21) {
 371                         if ($perm === 'rw') {
 372                                 $writable = 1;
 373                         } else {
 374                                 $writable = 0;
 375                         }
 376
 377                         if ($writable != $contact['writable']) {
 378                                 q("UPDATE `contact` SET `writable` = %d WHERE `id` = %d",
 379                                         intval($writable),
 380                                         intval($contact_id)
 381                                 );
 382                         }
 383                 }
 384
 385                 header("Content-type: application/atom+xml");
 386                 $o = DFRN::feed($dfrn_id, $a->argv[1], $last_update, $direction);
 387                 echo $o;
 388                 killme();
 389         }
 390 }
 391
 392 function dfrn_poll_content(App $a)
 393 {
 394         $dfrn_id         = x($_GET,'dfrn_id')         ? $_GET['dfrn_id']              : '';
 395         $type            = x($_GET,'type')            ? $_GET['type']                 : 'data';
 396         $last_update     = x($_GET,'last_update')     ? $_GET['last_update']          : '';
 397         $destination_url = x($_GET,'destination_url') ? $_GET['destination_url']      : '';
 398         $sec             = x($_GET,'sec')             ? $_GET['sec']                  : '';
 399         $dfrn_version    = x($_GET,'dfrn_version')    ? (float) $_GET['dfrn_version'] : 2.0;
 400         $perm            = x($_GET,'perm')            ? $_GET['perm']                 : 'r';
 401         $quiet           = x($_GET,'quiet')           ? true                          : false;
 402
 403         $direction = -1;
 404         if (strpos($dfrn_id, ':') == 1) {
 405                 $direction = intval(substr($dfrn_id, 0, 1));
 406                 $dfrn_id = substr($dfrn_id, 2);
 407         }
 408
 409         if ($dfrn_id != '') {
 410                 // initial communication from external contact
 411                 $hash = random_string();
 412
 413                 $status = 0;
 414
 415                 $r = q("DELETE FROM `challenge` WHERE `expire` < " . intval(time()));
 416
 417                 if ($type !== 'profile') {
 418                         $r = q("INSERT INTO `challenge` ( `challenge`, `dfrn-id`, `expire` , `type`, `last_update` )
 419                                 VALUES( '%s', '%s', '%s', '%s', '%s' ) ",
 420                                 dbesc($hash),
 421                                 dbesc($dfrn_id),
 422                                 intval(time() + 60 ),
 423                                 dbesc($type),
 424                                 dbesc($last_update)
 425                         );
 426                 }
 427
 428                 $sql_extra = '';
 429                 switch ($direction) {
 430                         case -1:
 431                                 if ($type === 'profile') {
 432                                         $sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", dbesc($dfrn_id), dbesc($dfrn_id));
 433                                 } else {
 434                                         $sql_extra = sprintf(" AND `issued-id` = '%s' ", dbesc($dfrn_id));
 435                                 }
 436
 437                                 $my_id = $dfrn_id;
 438                                 break;
 439                         case 0:
 440                                 $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 441                                 $my_id = '1:' . $dfrn_id;
 442                                 break;
 443                         case 1:
 444                                 $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 445                                 $my_id = '0:' . $dfrn_id;
 446                                 break;
 447                         default:
 448                                 goaway(System::baseUrl());
 449                                 break; // NOTREACHED
 450                 }
 451
 452                 $nickname = $a->argv[1];
 453
 454                 $r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname`
 455                         FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
 456                         WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
 457                         AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
 458                         dbesc($nickname)
 459                 );
 460                 if (DBM::is_result($r)) {
 461                         $challenge = '';
 462                         $encrypted_id = '';
 463                         $id_str = $my_id . '.' . mt_rand(1000, 9999);
 464
 465                         if (($r[0]['duplex'] && strlen($r[0]['pubkey'])) || !strlen($r[0]['prvkey'])) {
 466                                 openssl_public_encrypt($hash, $challenge, $r[0]['pubkey']);
 467                                 openssl_public_encrypt($id_str, $encrypted_id, $r[0]['pubkey']);
 468                         } else {
 469                                 openssl_private_encrypt($hash, $challenge, $r[0]['prvkey']);
 470                                 openssl_private_encrypt($id_str, $encrypted_id, $r[0]['prvkey']);
 471                         }
 472
 473                         $challenge = bin2hex($challenge);
 474                         $encrypted_id = bin2hex($encrypted_id);
 475                 } else {
 476                         $status = 1;
 477                         $challenge = '';
 478                         $encrypted_id = '';
 479                 }
 480
 481                 if (($type === 'profile') && (strlen($sec))) {
 482                         // URL reply
 483                         if ($dfrn_version < 2.2) {
 484                                 $s = fetch_url($r[0]['poll']
 485                                         . '?dfrn_id=' . $encrypted_id
 486                                         . '&type=profile-check'
 487                                         . '&dfrn_version=' . DFRN_PROTOCOL_VERSION
 488                                         . '&challenge=' . $challenge
 489                                         . '&sec=' . $sec
 490                                 );
 491                         } else {
 492                                 $s = post_url($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
 501                         $profile = ((DBM::is_result($r) && $r[0]['nickname']) ? $r[0]['nickname'] : $nickname);
 502
 503                         switch ($destination_url) {
 504                                 case 'profile':
 505                                         $dest = System::baseUrl() . '/profile/' . $profile . '?f=&tab=profile';
 506                                         break;
 507                                 case 'photos':
 508                                         $dest = System::baseUrl() . '/photos/' . $profile;
 509                                         break;
 510                                 case 'status':
 511                                 case '':
 512                                         $dest = System::baseUrl() . '/profile/' . $profile;
 513                                         break;
 514                                 default:
 515                                         $appendix = (strstr($destination_url, '?') ? '&f=&redir=1' : '?f=&redir=1');
 516                                         $dest = $destination_url . $appendix;
 517                                         break;
 518                         }
 519
 520                         logger("dfrn_poll: sec profile: " . $s, LOGGER_DATA);
 521
 522                         if (strlen($s) && strstr($s, '<?xml')) {
 523                                 $xml = parse_xml_string($s);
 524
 525                                 logger('dfrn_poll: profile: parsed xml: ' . print_r($xml, true), LOGGER_DATA);
 526
 527                                 logger('dfrn_poll: secure profile: challenge: ' . $xml->challenge . ' expecting ' . $hash);
 528                                 logger('dfrn_poll: secure profile: sec: ' . $xml->sec . ' expecting ' . $sec);
 529
 530                                 if (((int) $xml->status == 0) && ($xml->challenge == $hash) && ($xml->sec == $sec)) {
 531                                         $_SESSION['authenticated'] = 1;
 532                                         if (!x($_SESSION, 'remote')) {
 533                                                 $_SESSION['remote'] = [];
 534                                         }
 535
 536                                         $_SESSION['remote'][] = ['cid' => $r[0]['id'], 'uid' => $r[0]['uid'], 'url' => $r[0]['url']];
 537                                         $_SESSION['visitor_id'] = $r[0]['id'];
 538                                         $_SESSION['visitor_home'] = $r[0]['url'];
 539                                         $_SESSION['visitor_visiting'] = $r[0]['uid'];
 540                                         if (!$quiet) {
 541                                                 info(L10n::t('%1$s welcomes %2$s', $r[0]['username'], $r[0]['name']) . EOL);
 542                                         }
 543
 544                                         // Visitors get 1 day session.
 545                                         $session_id = session_id();
 546                                         $expire = time() + 86400;
 547                                         q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s'",
 548                                                 dbesc($expire),
 549                                                 dbesc($session_id)
 550                                         );
 551                                 }
 552
 553                                 goaway($dest);
 554                         }
 555                         goaway($dest);
 556                         // NOTREACHED
 557                 } else {
 558                         // XML reply
 559                         header("Content-type: text/xml");
 560                         echo '<?xml version="1.0" encoding="UTF-8"?>' . "\r\n"
 561                                 . '<dfrn_poll>' . "\r\n"
 562                                 . "\t" . '<status>' . $status . '</status>' . "\r\n"
 563                                 . "\t" . '<dfrn_version>' . DFRN_PROTOCOL_VERSION . '</dfrn_version>' . "\r\n"
 564                                 . "\t" . '<dfrn_id>' . $encrypted_id . '</dfrn_id>' . "\r\n"
 565                                 . "\t" . '<challenge>' . $challenge . '</challenge>' . "\r\n"
 566                                 . '</dfrn_poll>' . "\r\n";
 567                         killme();
 568                         // NOTREACHED
 569                 }
 570         }
 571 }