mod/dfrn_poll.php

   1 <?php
   2
   3 use Friendica\App;
   4 use Friendica\Core\Config;
   5 use Friendica\Core\System;
   6
   7 require_once('include/items.php');
   8 require_once('include/auth.php');
   9 require_once('include/dfrn.php');
  10 require_once('include/ostatus.php');
  11
  12 function dfrn_poll_init(App $a) {
  13         $dfrn_id         = ((x($_GET,'dfrn_id'))         ? $_GET['dfrn_id']              : '');
  14         $type            = ((x($_GET,'type'))            ? $_GET['type']                 : 'data');
  15         $last_update     = ((x($_GET,'last_update'))     ? $_GET['last_update']          : '');
  16         $destination_url = ((x($_GET,'destination_url')) ? $_GET['destination_url']      : '');
  17         $challenge       = ((x($_GET,'challenge'))       ? $_GET['challenge']            : '');
  18         $sec             = ((x($_GET,'sec'))             ? $_GET['sec']                  : '');
  19         $dfrn_version    = ((x($_GET,'dfrn_version'))    ? (float) $_GET['dfrn_version'] : 2.0);
  20         $perm            = ((x($_GET,'perm'))            ? $_GET['perm']                 : 'r');
  21         $quiet                   = ((x($_GET,'quiet'))                   ? true                                                  : false);
  22
  23         // Possibly it is an OStatus compatible server that requests a user feed
  24         if (($a->argc > 1) && ($dfrn_id == '') && !strstr($_SERVER["HTTP_USER_AGENT"], 'Friendica')) {
  25                 $nickname = $a->argv[1];
  26                 header("Content-type: application/atom+xml");
  27                 echo ostatus::feed($a, $nickname, $last_update, 10);
  28                 killme();
  29         }
  30
  31         $direction = (-1);
  32
  33
  34         if(strpos($dfrn_id,':') == 1) {
  35                 $direction = intval(substr($dfrn_id,0,1));
  36                 $dfrn_id   = substr($dfrn_id,2);
  37         }
  38
  39         $hidewall = false;
  40
  41         if(($dfrn_id === '') && (! x($_POST,'dfrn_id'))) {
  42                 if((Config::get('system','block_public')) && (! local_user()) && (! remote_user())) {
  43                         http_status_exit(403);
  44                 }
  45
  46                 $user = '';
  47                 if($a->argc > 1) {
  48                         $r = q("SELECT `hidewall`,`nickname` FROM `user` WHERE `user`.`nickname` = '%s' LIMIT 1",
  49                                 dbesc($a->argv[1])
  50                         );
  51                         if (!$r)
  52                                 http_status_exit(404);
  53
  54                         $hidewall = ($r[0]['hidewall'] && !local_user());
  55
  56                         $user = $r[0]['nickname'];
  57                 }
  58
  59                 logger('dfrn_poll: public feed request from ' . $_SERVER['REMOTE_ADDR'] . ' for ' . $user);
  60                 header("Content-type: application/atom+xml");
  61                 echo dfrn::feed('', $user,$last_update, 0, $hidewall);
  62                 killme();
  63         }
  64
  65         if(($type === 'profile') && (! strlen($sec))) {
  66
  67                 $sql_extra = '';
  68                 switch($direction) {
  69                         case (-1):
  70                                 $sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", dbesc($dfrn_id),dbesc($dfrn_id));
  71                                 $my_id = $dfrn_id;
  72                                 break;
  73                         case 0:
  74                                 $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
  75                                 $my_id = '1:' . $dfrn_id;
  76                                 break;
  77                         case 1:
  78                                 $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
  79                                 $my_id = '0:' . $dfrn_id;
  80                                 break;
  81                         default:
  82                                 goaway(System::baseUrl());
  83                                 break; // NOTREACHED
  84                 }
  85
  86                 $r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname`
  87                         FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
  88                         WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
  89                         AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
  90                         dbesc($a->argv[1])
  91                 );
  92
  93                 if (dbm::is_result($r)) {
  94
  95                         $s = fetch_url($r[0]['poll'] . '?dfrn_id=' . $my_id . '&type=profile-check');
  96
  97                         logger("dfrn_poll: old profile returns " . $s, LOGGER_DATA);
  98
  99                         if(strlen($s)) {
 100
 101                                 $xml = parse_xml_string($s);
 102
 103                                 if((int) $xml->status == 1) {
 104                                         $_SESSION['authenticated'] = 1;
 105                                         if(! x($_SESSION,'remote'))
 106                                                 $_SESSION['remote'] = array();
 107
 108                                         $_SESSION['remote'][] = array('cid' => $r[0]['id'],'uid' => $r[0]['uid'],'url' => $r[0]['url']);
 109
 110                                         $_SESSION['visitor_id'] = $r[0]['id'];
 111                                         $_SESSION['visitor_home'] = $r[0]['url'];
 112                                         $_SESSION['visitor_handle'] = $r[0]['addr'];
 113                                         $_SESSION['visitor_visiting'] = $r[0]['uid'];
 114                                         if(!$quiet)
 115                                                 info( sprintf(t('%1$s welcomes %2$s'), $r[0]['username'] , $r[0]['name']) . EOL);
 116                                         // Visitors get 1 day session.
 117                                         $session_id = session_id();
 118                                         $expire = time() + 86400;
 119                                         q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s'",
 120                                                 dbesc($expire),
 121                                                 dbesc($session_id)
 122                                         );
 123                                 }
 124                         }
 125                         $profile = $r[0]['nickname'];
 126                         goaway((strlen($destination_url)) ? $destination_url : System::baseUrl() . '/profile/' . $profile);
 127                 }
 128                 goaway(System::baseUrl());
 129
 130         }
 131
 132         if($type === 'profile-check' && $dfrn_version < 2.2 ) {
 133
 134                 if((strlen($challenge)) && (strlen($sec))) {
 135
 136                         q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
 137                         $r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1",
 138                                 dbesc($sec)
 139                         );
 140                         if (! dbm::is_result($r)) {
 141                                 xml_status(3, 'No ticket');
 142                                 // NOTREACHED
 143                         }
 144                         $orig_id = $r[0]['dfrn_id'];
 145                         if(strpos($orig_id, ':'))
 146                                 $orig_id = substr($orig_id,2);
 147
 148                         $c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
 149                                 intval($r[0]['cid'])
 150                         );
 151                         if (! dbm::is_result($c)) {
 152                                 xml_status(3, 'No profile');
 153                         }
 154                         $contact = $c[0];
 155
 156                         $sent_dfrn_id = hex2bin($dfrn_id);
 157                         $challenge    = hex2bin($challenge);
 158
 159                         $final_dfrn_id = '';
 160
 161                         if(($contact['duplex']) && strlen($contact['prvkey'])) {
 162                                 openssl_private_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['prvkey']);
 163                                 openssl_private_decrypt($challenge,$decoded_challenge,$contact['prvkey']);
 164                         }
 165                         else {
 166                                 openssl_public_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['pubkey']);
 167                                 openssl_public_decrypt($challenge,$decoded_challenge,$contact['pubkey']);
 168                         }
 169
 170                         $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
 171
 172                         if(strpos($final_dfrn_id,':') == 1)
 173                                 $final_dfrn_id = substr($final_dfrn_id,2);
 174
 175                         if($final_dfrn_id != $orig_id) {
 176                                 logger('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, LOGGER_DEBUG);
 177                                 // did not decode properly - cannot trust this site
 178                                 xml_status(3, 'Bad decryption');
 179                         }
 180
 181                         header("Content-type: text/xml");
 182                         echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
 183                         killme();
 184                         // NOTREACHED
 185                 }
 186                 else {
 187                                 // old protocol
 188
 189                         switch($direction) {
 190                                 case 1:
 191                                         $dfrn_id = '0:' . $dfrn_id;
 192                                         break;
 193                                 case 0:
 194                                         $dfrn_id = '1:' . $dfrn_id;
 195                                         break;
 196                                 default:
 197                                         break;
 198                         }
 199
 200
 201                         q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
 202                         $r = q("SELECT * FROM `profile_check` WHERE `dfrn_id` = '%s' ORDER BY `expire` DESC",
 203                                 dbesc($dfrn_id));
 204                         if (dbm::is_result($r)) {
 205                                 xml_status(1);
 206                                 return; // NOTREACHED
 207                         }
 208                         xml_status(0);
 209                         return; // NOTREACHED
 210                 }
 211         }
 212
 213 }
 214
 215
 216
 217 function dfrn_poll_post(App $a) {
 218
 219         $dfrn_id      = ((x($_POST,'dfrn_id'))      ? $_POST['dfrn_id']              : '');
 220         $challenge    = ((x($_POST,'challenge'))    ? $_POST['challenge']            : '');
 221         $url          = ((x($_POST,'url'))          ? $_POST['url']                  : '');
 222         $sec          = ((x($_POST,'sec'))          ? $_POST['sec']                  : '');
 223         $ptype        = ((x($_POST,'type'))         ? $_POST['type']                 : '');
 224         $dfrn_version = ((x($_POST,'dfrn_version')) ? (float) $_POST['dfrn_version'] : 2.0);
 225         $perm         = ((x($_POST,'perm'))         ? $_POST['perm']                 : 'r');
 226
 227         if($ptype === 'profile-check') {
 228
 229                 if((strlen($challenge)) && (strlen($sec))) {
 230
 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                         $orig_id = $r[0]['dfrn_id'];
 242                         if(strpos($orig_id, ':'))
 243                                 $orig_id = substr($orig_id,2);
 244
 245                         $c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
 246                                 intval($r[0]['cid'])
 247                         );
 248                         if (! dbm::is_result($c)) {
 249                                 xml_status(3, 'No profile');
 250                         }
 251                         $contact = $c[0];
 252
 253                         $sent_dfrn_id = hex2bin($dfrn_id);
 254                         $challenge    = hex2bin($challenge);
 255
 256                         $final_dfrn_id = '';
 257
 258                         if(($contact['duplex']) && strlen($contact['prvkey'])) {
 259                                 openssl_private_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['prvkey']);
 260                                 openssl_private_decrypt($challenge,$decoded_challenge,$contact['prvkey']);
 261                         }
 262                         else {
 263                                 openssl_public_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['pubkey']);
 264                                 openssl_public_decrypt($challenge,$decoded_challenge,$contact['pubkey']);
 265                         }
 266
 267                         $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
 268
 269                         if(strpos($final_dfrn_id,':') == 1)
 270                                 $final_dfrn_id = substr($final_dfrn_id,2);
 271
 272                         if($final_dfrn_id != $orig_id) {
 273                                 logger('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, LOGGER_DEBUG);
 274                                 // did not decode properly - cannot trust this site
 275                                 xml_status(3, 'Bad decryption');
 276                         }
 277
 278                         header("Content-type: text/xml");
 279                         echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
 280                         killme();
 281                         // NOTREACHED
 282                 }
 283
 284         }
 285
 286         $direction    = (-1);
 287         if(strpos($dfrn_id,':') == 1) {
 288                 $direction = intval(substr($dfrn_id,0,1));
 289                 $dfrn_id   = substr($dfrn_id,2);
 290         }
 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
 331         $r = q("SELECT * FROM `contact` WHERE `blocked` = 0 AND `pending` = 0 $sql_extra LIMIT 1");
 332
 333
 334         if (! dbm::is_result($r)) {
 335                 killme();
 336         }
 337
 338         $contact = $r[0];
 339         $owner_uid = $r[0]['uid'];
 340         $contact_id = $r[0]['id'];
 341
 342
 343         if($type === 'reputation' && strlen($url)) {
 344                 $r = q("SELECT * FROM `contact` WHERE `url` = '%s' AND `uid` = %d LIMIT 1",
 345                         dbesc($url),
 346                         intval($owner_uid)
 347                 );
 348                 $reputation = 0;
 349                 $text = '';
 350
 351                 if (dbm::is_result($r)) {
 352                         $reputation = $r[0]['rating'];
 353                         $text = $r[0]['reason'];
 354
 355                         if($r[0]['id'] == $contact_id) {        // inquiring about own reputation not allowed
 356                                 $reputation = 0;
 357                                 $text = '';
 358                         }
 359                 }
 360
 361                 echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
 362                 <reputation>
 363                         <url>$url</url>
 364                         <rating>$reputation</rating>
 365                         <description>$text</description>
 366                 </reputation>
 367                 ";
 368                 killme();
 369                 // NOTREACHED
 370         }
 371         else {
 372
 373                 // Update the writable flag if it changed
 374                 logger('dfrn_poll: post request feed: ' . print_r($_POST,true),LOGGER_DATA);
 375                 if($dfrn_version >= 2.21) {
 376                         if($perm === 'rw')
 377                                 $writable = 1;
 378                         else
 379                                 $writable = 0;
 380
 381                         if($writable !=  $contact['writable']) {
 382                                 q("UPDATE `contact` SET `writable` = %d WHERE `id` = %d",
 383                                         intval($writable),
 384                                         intval($contact_id)
 385                                 );
 386                         }
 387                 }
 388
 389                 header("Content-type: application/atom+xml");
 390                 $o = dfrn::feed($dfrn_id, $a->argv[1], $last_update, $direction);
 391                 echo $o;
 392                 killme();
 393
 394         }
 395 }
 396
 397 function dfrn_poll_content(App $a) {
 398
 399         $dfrn_id         = ((x($_GET,'dfrn_id'))         ? $_GET['dfrn_id']              : '');
 400         $type            = ((x($_GET,'type'))            ? $_GET['type']                 : 'data');
 401         $last_update     = ((x($_GET,'last_update'))     ? $_GET['last_update']          : '');
 402         $destination_url = ((x($_GET,'destination_url')) ? $_GET['destination_url']      : '');
 403         $sec             = ((x($_GET,'sec'))             ? $_GET['sec']                  : '');
 404         $dfrn_version    = ((x($_GET,'dfrn_version'))    ? (float) $_GET['dfrn_version'] : 2.0);
 405         $perm            = ((x($_GET,'perm'))            ? $_GET['perm']                 : 'r');
 406         $quiet           = ((x($_GET,'quiet'))           ? true                          : false);
 407
 408         $direction = (-1);
 409         if(strpos($dfrn_id,':') == 1) {
 410                 $direction = intval(substr($dfrn_id,0,1));
 411                 $dfrn_id = substr($dfrn_id,2);
 412         }
 413
 414
 415         if($dfrn_id != '') {
 416                 // initial communication from external contact
 417                 $hash = random_string();
 418
 419                 $status = 0;
 420
 421                 $r = q("DELETE FROM `challenge` WHERE `expire` < " . intval(time()));
 422
 423                 if($type !== 'profile') {
 424                         $r = q("INSERT INTO `challenge` ( `challenge`, `dfrn-id`, `expire` , `type`, `last_update` )
 425                                 VALUES( '%s', '%s', '%s', '%s', '%s' ) ",
 426                                 dbesc($hash),
 427                                 dbesc($dfrn_id),
 428                                 intval(time() + 60 ),
 429                                 dbesc($type),
 430                                 dbesc($last_update)
 431                         );
 432                 }
 433                 $sql_extra = '';
 434                 switch($direction) {
 435                         case (-1):
 436                                 if($type === 'profile')
 437                                         $sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", dbesc($dfrn_id),dbesc($dfrn_id));
 438                                 else
 439                                         $sql_extra = sprintf(" AND `issued-id` = '%s' ", dbesc($dfrn_id));
 440                                 $my_id = $dfrn_id;
 441                                 break;
 442                         case 0:
 443                                 $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 444                                 $my_id = '1:' . $dfrn_id;
 445                                 break;
 446                         case 1:
 447                                 $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 448                                 $my_id = '0:' . $dfrn_id;
 449                                 break;
 450                         default:
 451                                 goaway(System::baseUrl());
 452                                 break; // NOTREACHED
 453                 }
 454
 455                 $nickname = $a->argv[1];
 456
 457                 $r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname`
 458                         FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
 459                         WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
 460                         AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
 461                         dbesc($nickname)
 462                 );
 463
 464                 if (dbm::is_result($r)) {
 465
 466                         $challenge = '';
 467                         $encrypted_id = '';
 468                         $id_str = $my_id . '.' . mt_rand(1000,9999);
 469
 470                         if(($r[0]['duplex'] && strlen($r[0]['pubkey'])) || (! strlen($r[0]['prvkey']))) {
 471                                 openssl_public_encrypt($hash,$challenge,$r[0]['pubkey']);
 472                                 openssl_public_encrypt($id_str,$encrypted_id,$r[0]['pubkey']);
 473                         }
 474                         else {
 475                                 openssl_private_encrypt($hash,$challenge,$r[0]['prvkey']);
 476                                 openssl_private_encrypt($id_str,$encrypted_id,$r[0]['prvkey']);
 477                         }
 478
 479                         $challenge = bin2hex($challenge);
 480                         $encrypted_id = bin2hex($encrypted_id);
 481                 }
 482                 else {
 483                         $status = 1;
 484                         $challenge = '';
 485                         $encrypted_id = '';
 486                 }
 487
 488                 if(($type === 'profile') && (strlen($sec))) {
 489
 490                         // URL reply
 491
 492                         if($dfrn_version < 2.2) {
 493                                 $s = fetch_url($r[0]['poll']
 494                                         . '?dfrn_id=' . $encrypted_id
 495                                         . '&type=profile-check'
 496                                         . '&dfrn_version=' . DFRN_PROTOCOL_VERSION
 497                                         . '&challenge=' . $challenge
 498                                         . '&sec=' . $sec
 499                                 );
 500                         }
 501                         else {
 502                                 $s = post_url($r[0]['poll'], array(
 503                                         'dfrn_id' => $encrypted_id,
 504                                         'type' => 'profile-check',
 505                                         'dfrn_version' => DFRN_PROTOCOL_VERSION,
 506                                         'challenge' => $challenge,
 507                                         'sec' => $sec
 508                                 ));
 509                         }
 510
 511                         $profile = ((dbm::is_result($r) && $r[0]['nickname']) ? $r[0]['nickname'] : $nickname);
 512
 513                         switch($destination_url) {
 514                                 case 'profile':
 515                                         $dest = System::baseUrl() . '/profile/' . $profile . '?f=&tab=profile';
 516                                         break;
 517                                 case 'photos':
 518                                         $dest = System::baseUrl() . '/photos/' . $profile;
 519                                         break;
 520                                 case 'status':
 521                                 case '':
 522                                         $dest = System::baseUrl() . '/profile/' . $profile;
 523                                         break;
 524                                 default:
 525                                         $appendix = (strstr($destination_url, '?') ? '&f=&redir=1' : '?f=&redir=1');
 526                                         $dest = $destination_url . $appendix;
 527                                         break;
 528                         }
 529
 530                         logger("dfrn_poll: sec profile: " . $s, LOGGER_DATA);
 531
 532                         if(strlen($s) && strstr($s,'<?xml')) {
 533
 534                                 $xml = parse_xml_string($s);
 535
 536                                 logger('dfrn_poll: profile: parsed xml: ' . print_r($xml,true), LOGGER_DATA);
 537
 538                                 logger('dfrn_poll: secure profile: challenge: ' . $xml->challenge . ' expecting ' . $hash);
 539                                 logger('dfrn_poll: secure profile: sec: ' . $xml->sec . ' expecting ' . $sec);
 540
 541
 542                                 if(((int) $xml->status == 0) && ($xml->challenge == $hash)  && ($xml->sec == $sec)) {
 543                                         $_SESSION['authenticated'] = 1;
 544                                         if(! x($_SESSION,'remote'))
 545                                                 $_SESSION['remote'] = array();
 546                                         $_SESSION['remote'][] = array('cid' => $r[0]['id'],'uid' => $r[0]['uid'],'url' => $r[0]['url']);
 547                                         $_SESSION['visitor_id'] = $r[0]['id'];
 548                                         $_SESSION['visitor_home'] = $r[0]['url'];
 549                                         $_SESSION['visitor_visiting'] = $r[0]['uid'];
 550                                         if(!$quiet)
 551                                                 info( sprintf(t('%1$s welcomes %2$s'), $r[0]['username'] , $r[0]['name']) . EOL);
 552                                         // Visitors get 1 day session.
 553                                         $session_id = session_id();
 554                                         $expire = time() + 86400;
 555                                         q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s'",
 556                                                 dbesc($expire),
 557                                                 dbesc($session_id)
 558                                         );
 559                                 }
 560
 561                                 goaway($dest);
 562                         }
 563                         goaway($dest);
 564                         // NOTREACHED
 565
 566                 }
 567                 else {
 568                         // XML reply
 569                         header("Content-type: text/xml");
 570                         echo '<?xml version="1.0" encoding="UTF-8"?>' . "\r\n"
 571                                 . '<dfrn_poll>' . "\r\n"
 572                                 . "\t" . '<status>' . $status . '</status>' . "\r\n"
 573                                 . "\t" . '<dfrn_version>' . DFRN_PROTOCOL_VERSION . '</dfrn_version>' . "\r\n"
 574                                 . "\t" . '<dfrn_id>' . $encrypted_id . '</dfrn_id>' . "\r\n"
 575                                 . "\t" . '<challenge>' . $challenge . '</challenge>' . "\r\n"
 576                                 . '</dfrn_poll>' . "\r\n" ;
 577                         killme();
 578                         // NOTREACHED
 579                 }
 580         }
 581 }