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\System;
   9 use Friendica\Database\DBM;
  10 use Friendica\Module\Login;
  11 use Friendica\Protocol\DFRN;
  12 use Friendica\Protocol\OStatus;
  13
  14 require_once 'include/items.php';
  15
  16 function dfrn_poll_init(App $a)
  17 {
  18         Login::sessionAuth();
  19
  20         $dfrn_id         = defaults($_GET, 'dfrn_id'        , '');
  21         $type            = defaults($_GET, 'type'           , 'data');
  22         $last_update     = defaults($_GET, 'last_update'    , '');
  23         $destination_url = defaults($_GET, 'destination_url', '');
  24         $challenge       = defaults($_GET, 'challenge'      , '');
  25         $sec             = defaults($_GET, 'sec'            , '');
  26         $dfrn_version    = (float) defaults($_GET, 'dfrn_version'   , 2.0);
  27         $perm            = defaults($_GET, 'perm'           , 'r');
  28         $quiet                   = x($_GET, 'quiet');
  29
  30         // Possibly it is an OStatus compatible server that requests a user feed
  31         if (($a->argc > 1) && ($dfrn_id == '') && !strstr($_SERVER["HTTP_USER_AGENT"], 'Friendica')) {
  32                 $nickname = $a->argv[1];
  33                 header("Content-type: application/atom+xml");
  34                 echo OStatus::feed($nickname, $last_update, 10);
  35                 killme();
  36         }
  37
  38         $direction = -1;
  39
  40         if (strpos($dfrn_id, ':') == 1) {
  41                 $direction = intval(substr($dfrn_id, 0, 1));
  42                 $dfrn_id = substr($dfrn_id, 2);
  43         }
  44
  45         $hidewall = false;
  46
  47         if (($dfrn_id === '') && (!x($_POST, 'dfrn_id'))) {
  48                 if (Config::get('system', 'block_public') && !local_user() && !remote_user()) {
  49                         http_status_exit(403);
  50                 }
  51
  52                 $user = '';
  53                 if ($a->argc > 1) {
  54                         $r = q("SELECT `hidewall`,`nickname` FROM `user` WHERE `user`.`nickname` = '%s' LIMIT 1",
  55                                 dbesc($a->argv[1])
  56                         );
  57                         if (!$r) {
  58                                 http_status_exit(404);
  59                         }
  60
  61                         $hidewall = ($r[0]['hidewall'] && !local_user());
  62
  63                         $user = $r[0]['nickname'];
  64                 }
  65
  66                 logger('dfrn_poll: public feed request from ' . $_SERVER['REMOTE_ADDR'] . ' for ' . $user);
  67                 header("Content-type: application/atom+xml");
  68                 echo DFRN::feed('', $user, $last_update, 0, $hidewall);
  69                 killme();
  70         }
  71
  72         if (($type === 'profile') && (!strlen($sec))) {
  73                 $sql_extra = '';
  74                 switch ($direction) {
  75                         case -1:
  76                                 $sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", dbesc($dfrn_id), dbesc($dfrn_id));
  77                                 $my_id = $dfrn_id;
  78                                 break;
  79                         case 0:
  80                                 $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
  81                                 $my_id = '1:' . $dfrn_id;
  82                                 break;
  83                         case 1:
  84                                 $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
  85                                 $my_id = '0:' . $dfrn_id;
  86                                 break;
  87                         default:
  88                                 goaway(System::baseUrl());
  89                                 break; // NOTREACHED
  90                 }
  91
  92                 $r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname`
  93                         FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
  94                         WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
  95                         AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
  96                         dbesc($a->argv[1])
  97                 );
  98
  99                 if (DBM::is_result($r)) {
 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                                 $xml = parse_xml_string($s);
 106
 107                                 if ((int) $xml->status === 1) {
 108                                         $_SESSION['authenticated'] = 1;
 109                                         if (!x($_SESSION, 'remote')) {
 110                                                 $_SESSION['remote'] = array();
 111                                         }
 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                                         }
 122
 123                                         // Visitors get 1 day session.
 124                                         $session_id = session_id();
 125                                         $expire = time() + 86400;
 126                                         q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s'",
 127                                                 dbesc($expire),
 128                                                 dbesc($session_id)
 129                                         );
 130                                 }
 131                         }
 132                         $profile = $r[0]['nickname'];
 133                         goaway((strlen($destination_url)) ? $destination_url : System::baseUrl() . '/profile/' . $profile);
 134                 }
 135                 goaway(System::baseUrl());
 136         }
 137
 138         if ($type === 'profile-check' && $dfrn_version < 2.2) {
 139                 if ((strlen($challenge)) && (strlen($sec))) {
 140                         q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
 141                         $r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1",
 142                                 dbesc($sec)
 143                         );
 144                         if (!DBM::is_result($r)) {
 145                                 xml_status(3, 'No ticket');
 146                                 // NOTREACHED
 147                         }
 148
 149                         $orig_id = $r[0]['dfrn_id'];
 150                         if (strpos($orig_id, ':')) {
 151                                 $orig_id = substr($orig_id, 2);
 152                         }
 153
 154                         $c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
 155                                 intval($r[0]['cid'])
 156                         );
 157                         if (!DBM::is_result($c)) {
 158                                 xml_status(3, 'No profile');
 159                         }
 160
 161                         $contact = $c[0];
 162
 163                         $sent_dfrn_id = hex2bin($dfrn_id);
 164                         $challenge = hex2bin($challenge);
 165
 166                         $final_dfrn_id = '';
 167
 168                         if (($contact['duplex']) && strlen($contact['prvkey'])) {
 169                                 openssl_private_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['prvkey']);
 170                                 openssl_private_decrypt($challenge, $decoded_challenge, $contact['prvkey']);
 171                         } else {
 172                                 openssl_public_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['pubkey']);
 173                                 openssl_public_decrypt($challenge, $decoded_challenge, $contact['pubkey']);
 174                         }
 175
 176                         $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
 177
 178                         if (strpos($final_dfrn_id, ':') == 1) {
 179                                 $final_dfrn_id = substr($final_dfrn_id, 2);
 180                         }
 181
 182                         if ($final_dfrn_id != $orig_id) {
 183                                 logger('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, LOGGER_DEBUG);
 184                                 // did not decode properly - cannot trust this site
 185                                 xml_status(3, 'Bad decryption');
 186                         }
 187
 188                         header("Content-type: text/xml");
 189                         echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
 190                         killme();
 191                         // NOTREACHED
 192                 } else {
 193                         // old protocol
 194                         switch ($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                         q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
 206                         $r = q("SELECT * FROM `profile_check` WHERE `dfrn_id` = '%s' ORDER BY `expire` DESC",
 207                                 dbesc($dfrn_id));
 208                         if (DBM::is_result($r)) {
 209                                 xml_status(1);
 210                                 return; // NOTREACHED
 211                         }
 212                         xml_status(0);
 213                         return; // NOTREACHED
 214                 }
 215         }
 216 }
 217
 218 function dfrn_poll_post(App $a)
 219 {
 220         $dfrn_id      = x($_POST,'dfrn_id')      ? $_POST['dfrn_id']              : '';
 221         $challenge    = x($_POST,'challenge')    ? $_POST['challenge']            : '';
 222         $url          = x($_POST,'url')          ? $_POST['url']                  : '';
 223         $sec          = x($_POST,'sec')          ? $_POST['sec']                  : '';
 224         $ptype        = x($_POST,'type')         ? $_POST['type']                 : '';
 225         $dfrn_version = x($_POST,'dfrn_version') ? (float) $_POST['dfrn_version'] : 2.0;
 226         $perm         = x($_POST,'perm')         ? $_POST['perm']                 : 'r';
 227
 228         if ($ptype === 'profile-check') {
 229                 if (strlen($challenge) && strlen($sec)) {
 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
 241                         $orig_id = $r[0]['dfrn_id'];
 242                         if (strpos($orig_id, ':')) {
 243                                 $orig_id = substr($orig_id, 2);
 244                         }
 245
 246                         $c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
 247                                 intval($r[0]['cid'])
 248                         );
 249                         if (!DBM::is_result($c)) {
 250                                 xml_status(3, 'No profile');
 251                         }
 252
 253                         $contact = $c[0];
 254
 255                         $sent_dfrn_id = hex2bin($dfrn_id);
 256                         $challenge = hex2bin($challenge);
 257
 258                         $final_dfrn_id = '';
 259
 260                         if ($contact['duplex'] && strlen($contact['prvkey'])) {
 261                                 openssl_private_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['prvkey']);
 262                                 openssl_private_decrypt($challenge, $decoded_challenge, $contact['prvkey']);
 263                         } else {
 264                                 openssl_public_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['pubkey']);
 265                                 openssl_public_decrypt($challenge, $decoded_challenge, $contact['pubkey']);
 266                         }
 267
 268                         $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
 269
 270                         if (strpos($final_dfrn_id, ':') == 1) {
 271                                 $final_dfrn_id = substr($final_dfrn_id, 2);
 272                         }
 273
 274                         if ($final_dfrn_id != $orig_id) {
 275                                 logger('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, LOGGER_DEBUG);
 276                                 // did not decode properly - cannot trust this site
 277                                 xml_status(3, 'Bad decryption');
 278                         }
 279
 280                         header("Content-type: text/xml");
 281                         echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
 282                         killme();
 283                         // NOTREACHED
 284                 }
 285         }
 286
 287         $direction = -1;
 288         if (strpos($dfrn_id, ':') == 1) {
 289                 $direction = intval(substr($dfrn_id, 0, 1));
 290                 $dfrn_id = substr($dfrn_id, 2);
 291         }
 292
 293         $r = q("SELECT * FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s' LIMIT 1",
 294                 dbesc($dfrn_id),
 295                 dbesc($challenge)
 296         );
 297
 298         if (!DBM::is_result($r)) {
 299                 killme();
 300         }
 301
 302         $type = $r[0]['type'];
 303         $last_update = $r[0]['last_update'];
 304
 305         $r = q("DELETE FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s'",
 306                 dbesc($dfrn_id),
 307                 dbesc($challenge)
 308         );
 309
 310
 311         $sql_extra = '';
 312         switch ($direction) {
 313                 case -1:
 314                         $sql_extra = sprintf(" AND `issued-id` = '%s' ", dbesc($dfrn_id));
 315                         $my_id = $dfrn_id;
 316                         break;
 317                 case 0:
 318                         $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 319                         $my_id = '1:' . $dfrn_id;
 320                         break;
 321                 case 1:
 322                         $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 323                         $my_id = '0:' . $dfrn_id;
 324                         break;
 325                 default:
 326                         goaway(System::baseUrl());
 327                         break; // NOTREACHED
 328         }
 329
 330         $r = q("SELECT * FROM `contact` WHERE `blocked` = 0 AND `pending` = 0 $sql_extra LIMIT 1");
 331         if (!DBM::is_result($r)) {
 332                 killme();
 333         }
 334
 335         $contact = $r[0];
 336         $owner_uid = $r[0]['uid'];
 337         $contact_id = $r[0]['id'];
 338
 339         if ($type === 'reputation' && strlen($url)) {
 340                 $r = q("SELECT * FROM `contact` WHERE `url` = '%s' AND `uid` = %d LIMIT 1",
 341                         dbesc($url),
 342                         intval($owner_uid)
 343                 );
 344                 $reputation = 0;
 345                 $text = '';
 346
 347                 if (DBM::is_result($r)) {
 348                         $reputation = $r[0]['rating'];
 349                         $text = $r[0]['reason'];
 350
 351                         if ($r[0]['id'] == $contact_id) { // inquiring about own reputation not allowed
 352                                 $reputation = 0;
 353                                 $text = '';
 354                         }
 355                 }
 356
 357                 echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
 358                 <reputation>
 359                         <url>$url</url>
 360                         <rating>$reputation</rating>
 361                         <description>$text</description>
 362                 </reputation>
 363                 ";
 364                 killme();
 365                 // NOTREACHED
 366         } else {
 367                 // Update the writable flag if it changed
 368                 logger('dfrn_poll: post request feed: ' . print_r($_POST, true), LOGGER_DATA);
 369                 if ($dfrn_version >= 2.21) {
 370                         if ($perm === 'rw') {
 371                                 $writable = 1;
 372                         } else {
 373                                 $writable = 0;
 374                         }
 375
 376                         if ($writable != $contact['writable']) {
 377                                 q("UPDATE `contact` SET `writable` = %d WHERE `id` = %d",
 378                                         intval($writable),
 379                                         intval($contact_id)
 380                                 );
 381                         }
 382                 }
 383
 384                 header("Content-type: application/atom+xml");
 385                 $o = DFRN::feed($dfrn_id, $a->argv[1], $last_update, $direction);
 386                 echo $o;
 387                 killme();
 388         }
 389 }
 390
 391 function dfrn_poll_content(App $a)
 392 {
 393         $dfrn_id         = x($_GET,'dfrn_id')         ? $_GET['dfrn_id']              : '';
 394         $type            = x($_GET,'type')            ? $_GET['type']                 : 'data';
 395         $last_update     = x($_GET,'last_update')     ? $_GET['last_update']          : '';
 396         $destination_url = x($_GET,'destination_url') ? $_GET['destination_url']      : '';
 397         $sec             = x($_GET,'sec')             ? $_GET['sec']                  : '';
 398         $dfrn_version    = x($_GET,'dfrn_version')    ? (float) $_GET['dfrn_version'] : 2.0;
 399         $perm            = x($_GET,'perm')            ? $_GET['perm']                 : 'r';
 400         $quiet           = x($_GET,'quiet')           ? true                          : false;
 401
 402         $direction = -1;
 403         if (strpos($dfrn_id, ':') == 1) {
 404                 $direction = intval(substr($dfrn_id, 0, 1));
 405                 $dfrn_id = substr($dfrn_id, 2);
 406         }
 407
 408         if ($dfrn_id != '') {
 409                 // initial communication from external contact
 410                 $hash = random_string();
 411
 412                 $status = 0;
 413
 414                 $r = q("DELETE FROM `challenge` WHERE `expire` < " . intval(time()));
 415
 416                 if ($type !== 'profile') {
 417                         $r = q("INSERT INTO `challenge` ( `challenge`, `dfrn-id`, `expire` , `type`, `last_update` )
 418                                 VALUES( '%s', '%s', '%s', '%s', '%s' ) ",
 419                                 dbesc($hash),
 420                                 dbesc($dfrn_id),
 421                                 intval(time() + 60 ),
 422                                 dbesc($type),
 423                                 dbesc($last_update)
 424                         );
 425                 }
 426
 427                 $sql_extra = '';
 428                 switch ($direction) {
 429                         case -1:
 430                                 if ($type === 'profile') {
 431                                         $sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", dbesc($dfrn_id), dbesc($dfrn_id));
 432                                 } else {
 433                                         $sql_extra = sprintf(" AND `issued-id` = '%s' ", dbesc($dfrn_id));
 434                                 }
 435
 436                                 $my_id = $dfrn_id;
 437                                 break;
 438                         case 0:
 439                                 $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 440                                 $my_id = '1:' . $dfrn_id;
 441                                 break;
 442                         case 1:
 443                                 $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 444                                 $my_id = '0:' . $dfrn_id;
 445                                 break;
 446                         default:
 447                                 goaway(System::baseUrl());
 448                                 break; // NOTREACHED
 449                 }
 450
 451                 $nickname = $a->argv[1];
 452
 453                 $r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname`
 454                         FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
 455                         WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
 456                         AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
 457                         dbesc($nickname)
 458                 );
 459                 if (DBM::is_result($r)) {
 460                         $challenge = '';
 461                         $encrypted_id = '';
 462                         $id_str = $my_id . '.' . mt_rand(1000, 9999);
 463
 464                         if (($r[0]['duplex'] && strlen($r[0]['pubkey'])) || !strlen($r[0]['prvkey'])) {
 465                                 openssl_public_encrypt($hash, $challenge, $r[0]['pubkey']);
 466                                 openssl_public_encrypt($id_str, $encrypted_id, $r[0]['pubkey']);
 467                         } else {
 468                                 openssl_private_encrypt($hash, $challenge, $r[0]['prvkey']);
 469                                 openssl_private_encrypt($id_str, $encrypted_id, $r[0]['prvkey']);
 470                         }
 471
 472                         $challenge = bin2hex($challenge);
 473                         $encrypted_id = bin2hex($encrypted_id);
 474                 } else {
 475                         $status = 1;
 476                         $challenge = '';
 477                         $encrypted_id = '';
 478                 }
 479
 480                 if (($type === 'profile') && (strlen($sec))) {
 481                         // URL reply
 482                         if ($dfrn_version < 2.2) {
 483                                 $s = fetch_url($r[0]['poll']
 484                                         . '?dfrn_id=' . $encrypted_id
 485                                         . '&type=profile-check'
 486                                         . '&dfrn_version=' . DFRN_PROTOCOL_VERSION
 487                                         . '&challenge=' . $challenge
 488                                         . '&sec=' . $sec
 489                                 );
 490                         } else {
 491                                 $s = post_url($r[0]['poll'], array(
 492                                         'dfrn_id' => $encrypted_id,
 493                                         'type' => 'profile-check',
 494                                         'dfrn_version' => DFRN_PROTOCOL_VERSION,
 495                                         'challenge' => $challenge,
 496                                         'sec' => $sec
 497                                 ));
 498                         }
 499
 500                         $profile = ((DBM::is_result($r) && $r[0]['nickname']) ? $r[0]['nickname'] : $nickname);
 501
 502                         switch ($destination_url) {
 503                                 case 'profile':
 504                                         $dest = System::baseUrl() . '/profile/' . $profile . '?f=&tab=profile';
 505                                         break;
 506                                 case 'photos':
 507                                         $dest = System::baseUrl() . '/photos/' . $profile;
 508                                         break;
 509                                 case 'status':
 510                                 case '':
 511                                         $dest = System::baseUrl() . '/profile/' . $profile;
 512                                         break;
 513                                 default:
 514                                         $appendix = (strstr($destination_url, '?') ? '&f=&redir=1' : '?f=&redir=1');
 515                                         $dest = $destination_url . $appendix;
 516                                         break;
 517                         }
 518
 519                         logger("dfrn_poll: sec profile: " . $s, LOGGER_DATA);
 520
 521                         if (strlen($s) && strstr($s, '<?xml')) {
 522                                 $xml = parse_xml_string($s);
 523
 524                                 logger('dfrn_poll: profile: parsed xml: ' . print_r($xml, true), LOGGER_DATA);
 525
 526                                 logger('dfrn_poll: secure profile: challenge: ' . $xml->challenge . ' expecting ' . $hash);
 527                                 logger('dfrn_poll: secure profile: sec: ' . $xml->sec . ' expecting ' . $sec);
 528
 529                                 if (((int) $xml->status == 0) && ($xml->challenge == $hash) && ($xml->sec == $sec)) {
 530                                         $_SESSION['authenticated'] = 1;
 531                                         if (!x($_SESSION, 'remote')) {
 532                                                 $_SESSION['remote'] = array();
 533                                         }
 534
 535                                         $_SESSION['remote'][] = array('cid' => $r[0]['id'], 'uid' => $r[0]['uid'], 'url' => $r[0]['url']);
 536                                         $_SESSION['visitor_id'] = $r[0]['id'];
 537                                         $_SESSION['visitor_home'] = $r[0]['url'];
 538                                         $_SESSION['visitor_visiting'] = $r[0]['uid'];
 539                                         if (!$quiet) {
 540                                                 info(sprintf(t('%1$s welcomes %2$s'), $r[0]['username'], $r[0]['name']) . EOL);
 541                                         }
 542
 543                                         // Visitors get 1 day session.
 544                                         $session_id = session_id();
 545                                         $expire = time() + 86400;
 546                                         q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s'",
 547                                                 dbesc($expire),
 548                                                 dbesc($session_id)
 549                                         );
 550                                 }
 551
 552                                 goaway($dest);
 553                         }
 554                         goaway($dest);
 555                         // NOTREACHED
 556                 } else {
 557                         // XML reply
 558                         header("Content-type: text/xml");
 559                         echo '<?xml version="1.0" encoding="UTF-8"?>' . "\r\n"
 560                                 . '<dfrn_poll>' . "\r\n"
 561                                 . "\t" . '<status>' . $status . '</status>' . "\r\n"
 562                                 . "\t" . '<dfrn_version>' . DFRN_PROTOCOL_VERSION . '</dfrn_version>' . "\r\n"
 563                                 . "\t" . '<dfrn_id>' . $encrypted_id . '</dfrn_id>' . "\r\n"
 564                                 . "\t" . '<challenge>' . $challenge . '</challenge>' . "\r\n"
 565                                 . '</dfrn_poll>' . "\r\n";
 566                         killme();
 567                         // NOTREACHED
 568                 }
 569         }
 570 }