mod/dfrn_poll.php

   1 <?php
   2
   3 use Friendica\App;
   4 use Friendica\Core\Config;
   5 use Friendica\Core\System;
   6 use Friendica\Database\DBM;
   7 use Friendica\Protocol\DFRN;
   8
   9 require_once('include/items.php');
  10 require_once('include/auth.php');
  11 require_once('include/ostatus.php');
  12
  13 function dfrn_poll_init(App $a) {
  14         $dfrn_id         = ((x($_GET,'dfrn_id'))         ? $_GET['dfrn_id']              : '');
  15         $type            = ((x($_GET,'type'))            ? $_GET['type']                 : 'data');
  16         $last_update     = ((x($_GET,'last_update'))     ? $_GET['last_update']          : '');
  17         $destination_url = ((x($_GET,'destination_url')) ? $_GET['destination_url']      : '');
  18         $challenge       = ((x($_GET,'challenge'))       ? $_GET['challenge']            : '');
  19         $sec             = ((x($_GET,'sec'))             ? $_GET['sec']                  : '');
  20         $dfrn_version    = ((x($_GET,'dfrn_version'))    ? (float) $_GET['dfrn_version'] : 2.0);
  21         $perm            = ((x($_GET,'perm'))            ? $_GET['perm']                 : 'r');
  22         $quiet                   = ((x($_GET,'quiet'))                   ? true                                                  : false);
  23
  24         // Possibly it is an OStatus compatible server that requests a user feed
  25         if (($a->argc > 1) && ($dfrn_id == '') && !strstr($_SERVER["HTTP_USER_AGENT"], 'Friendica')) {
  26                 $nickname = $a->argv[1];
  27                 header("Content-type: application/atom+xml");
  28                 echo ostatus::feed($a, $nickname, $last_update, 10);
  29                 killme();
  30         }
  31
  32         $direction = (-1);
  33
  34
  35         if(strpos($dfrn_id,':') == 1) {
  36                 $direction = intval(substr($dfrn_id,0,1));
  37                 $dfrn_id   = substr($dfrn_id,2);
  38         }
  39
  40         $hidewall = false;
  41
  42         if(($dfrn_id === '') && (! x($_POST,'dfrn_id'))) {
  43                 if((Config::get('system','block_public')) && (! local_user()) && (! remote_user())) {
  44                         http_status_exit(403);
  45                 }
  46
  47                 $user = '';
  48                 if($a->argc > 1) {
  49                         $r = q("SELECT `hidewall`,`nickname` FROM `user` WHERE `user`.`nickname` = '%s' LIMIT 1",
  50                                 dbesc($a->argv[1])
  51                         );
  52                         if (!$r)
  53                                 http_status_exit(404);
  54
  55                         $hidewall = ($r[0]['hidewall'] && !local_user());
  56
  57                         $user = $r[0]['nickname'];
  58                 }
  59
  60                 logger('dfrn_poll: public feed request from ' . $_SERVER['REMOTE_ADDR'] . ' for ' . $user);
  61                 header("Content-type: application/atom+xml");
  62                 echo DFRN::feed('', $user,$last_update, 0, $hidewall);
  63                 killme();
  64         }
  65
  66         if(($type === 'profile') && (! strlen($sec))) {
  67
  68                 $sql_extra = '';
  69                 switch($direction) {
  70                         case (-1):
  71                                 $sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", dbesc($dfrn_id),dbesc($dfrn_id));
  72                                 $my_id = $dfrn_id;
  73                                 break;
  74                         case 0:
  75                                 $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
  76                                 $my_id = '1:' . $dfrn_id;
  77                                 break;
  78                         case 1:
  79                                 $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
  80                                 $my_id = '0:' . $dfrn_id;
  81                                 break;
  82                         default:
  83                                 goaway(System::baseUrl());
  84                                 break; // NOTREACHED
  85                 }
  86
  87                 $r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname`
  88                         FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
  89                         WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
  90                         AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
  91                         dbesc($a->argv[1])
  92                 );
  93
  94                 if (DBM::is_result($r)) {
  95
  96                         $s = fetch_url($r[0]['poll'] . '?dfrn_id=' . $my_id . '&type=profile-check');
  97
  98                         logger("dfrn_poll: old profile returns " . $s, LOGGER_DATA);
  99
 100                         if(strlen($s)) {
 101
 102                                 $xml = parse_xml_string($s);
 103
 104                                 if((int) $xml->status == 1) {
 105                                         $_SESSION['authenticated'] = 1;
 106                                         if(! x($_SESSION,'remote'))
 107                                                 $_SESSION['remote'] = array();
 108
 109                                         $_SESSION['remote'][] = array('cid' => $r[0]['id'],'uid' => $r[0]['uid'],'url' => $r[0]['url']);
 110
 111                                         $_SESSION['visitor_id'] = $r[0]['id'];
 112                                         $_SESSION['visitor_home'] = $r[0]['url'];
 113                                         $_SESSION['visitor_handle'] = $r[0]['addr'];
 114                                         $_SESSION['visitor_visiting'] = $r[0]['uid'];
 115                                         if(!$quiet)
 116                                                 info( sprintf(t('%1$s welcomes %2$s'), $r[0]['username'] , $r[0]['name']) . EOL);
 117                                         // Visitors get 1 day session.
 118                                         $session_id = session_id();
 119                                         $expire = time() + 86400;
 120                                         q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s'",
 121                                                 dbesc($expire),
 122                                                 dbesc($session_id)
 123                                         );
 124                                 }
 125                         }
 126                         $profile = $r[0]['nickname'];
 127                         goaway((strlen($destination_url)) ? $destination_url : System::baseUrl() . '/profile/' . $profile);
 128                 }
 129                 goaway(System::baseUrl());
 130
 131         }
 132
 133         if($type === 'profile-check' && $dfrn_version < 2.2 ) {
 134
 135                 if((strlen($challenge)) && (strlen($sec))) {
 136
 137                         q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
 138                         $r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1",
 139                                 dbesc($sec)
 140                         );
 141                         if (! DBM::is_result($r)) {
 142                                 xml_status(3, 'No ticket');
 143                                 // NOTREACHED
 144                         }
 145                         $orig_id = $r[0]['dfrn_id'];
 146                         if(strpos($orig_id, ':'))
 147                                 $orig_id = substr($orig_id,2);
 148
 149                         $c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
 150                                 intval($r[0]['cid'])
 151                         );
 152                         if (! DBM::is_result($c)) {
 153                                 xml_status(3, 'No profile');
 154                         }
 155                         $contact = $c[0];
 156
 157                         $sent_dfrn_id = hex2bin($dfrn_id);
 158                         $challenge    = hex2bin($challenge);
 159
 160                         $final_dfrn_id = '';
 161
 162                         if(($contact['duplex']) && strlen($contact['prvkey'])) {
 163                                 openssl_private_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['prvkey']);
 164                                 openssl_private_decrypt($challenge,$decoded_challenge,$contact['prvkey']);
 165                         }
 166                         else {
 167                                 openssl_public_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['pubkey']);
 168                                 openssl_public_decrypt($challenge,$decoded_challenge,$contact['pubkey']);
 169                         }
 170
 171                         $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
 172
 173                         if(strpos($final_dfrn_id,':') == 1)
 174                                 $final_dfrn_id = substr($final_dfrn_id,2);
 175
 176                         if($final_dfrn_id != $orig_id) {
 177                                 logger('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, LOGGER_DEBUG);
 178                                 // did not decode properly - cannot trust this site
 179                                 xml_status(3, 'Bad decryption');
 180                         }
 181
 182                         header("Content-type: text/xml");
 183                         echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
 184                         killme();
 185                         // NOTREACHED
 186                 }
 187                 else {
 188                                 // old protocol
 189
 190                         switch($direction) {
 191                                 case 1:
 192                                         $dfrn_id = '0:' . $dfrn_id;
 193                                         break;
 194                                 case 0:
 195                                         $dfrn_id = '1:' . $dfrn_id;
 196                                         break;
 197                                 default:
 198                                         break;
 199                         }
 200
 201
 202                         q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
 203                         $r = q("SELECT * FROM `profile_check` WHERE `dfrn_id` = '%s' ORDER BY `expire` DESC",
 204                                 dbesc($dfrn_id));
 205                         if (DBM::is_result($r)) {
 206                                 xml_status(1);
 207                                 return; // NOTREACHED
 208                         }
 209                         xml_status(0);
 210                         return; // NOTREACHED
 211                 }
 212         }
 213
 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
 230                 if((strlen($challenge)) && (strlen($sec))) {
 231
 232                         logger('dfrn_poll: POST: profile-check');
 233
 234                         q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
 235                         $r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1",
 236                                 dbesc($sec)
 237                         );
 238                         if (! DBM::is_result($r)) {
 239                                 xml_status(3, 'No ticket');
 240                                 // NOTREACHED
 241                         }
 242                         $orig_id = $r[0]['dfrn_id'];
 243                         if(strpos($orig_id, ':'))
 244                                 $orig_id = substr($orig_id,2);
 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                         $contact = $c[0];
 253
 254                         $sent_dfrn_id = hex2bin($dfrn_id);
 255                         $challenge    = hex2bin($challenge);
 256
 257                         $final_dfrn_id = '';
 258
 259                         if(($contact['duplex']) && strlen($contact['prvkey'])) {
 260                                 openssl_private_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['prvkey']);
 261                                 openssl_private_decrypt($challenge,$decoded_challenge,$contact['prvkey']);
 262                         }
 263                         else {
 264                                 openssl_public_decrypt($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                         if($final_dfrn_id != $orig_id) {
 274                                 logger('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, LOGGER_DEBUG);
 275                                 // did not decode properly - cannot trust this site
 276                                 xml_status(3, 'Bad decryption');
 277                         }
 278
 279                         header("Content-type: text/xml");
 280                         echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
 281                         killme();
 282                         // NOTREACHED
 283                 }
 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
 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
 332         $r = q("SELECT * FROM `contact` WHERE `blocked` = 0 AND `pending` = 0 $sql_extra LIMIT 1");
 333
 334
 335         if (! DBM::is_result($r)) {
 336                 killme();
 337         }
 338
 339         $contact = $r[0];
 340         $owner_uid = $r[0]['uid'];
 341         $contact_id = $r[0]['id'];
 342
 343
 344         if($type === 'reputation' && strlen($url)) {
 345                 $r = q("SELECT * FROM `contact` WHERE `url` = '%s' AND `uid` = %d LIMIT 1",
 346                         dbesc($url),
 347                         intval($owner_uid)
 348                 );
 349                 $reputation = 0;
 350                 $text = '';
 351
 352                 if (DBM::is_result($r)) {
 353                         $reputation = $r[0]['rating'];
 354                         $text = $r[0]['reason'];
 355
 356                         if($r[0]['id'] == $contact_id) {        // inquiring about own reputation not allowed
 357                                 $reputation = 0;
 358                                 $text = '';
 359                         }
 360                 }
 361
 362                 echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
 363                 <reputation>
 364                         <url>$url</url>
 365                         <rating>$reputation</rating>
 366                         <description>$text</description>
 367                 </reputation>
 368                 ";
 369                 killme();
 370                 // NOTREACHED
 371         }
 372         else {
 373
 374                 // Update the writable flag if it changed
 375                 logger('dfrn_poll: post request feed: ' . print_r($_POST,true),LOGGER_DATA);
 376                 if($dfrn_version >= 2.21) {
 377                         if($perm === 'rw')
 378                                 $writable = 1;
 379                         else
 380                                 $writable = 0;
 381
 382                         if($writable !=  $contact['writable']) {
 383                                 q("UPDATE `contact` SET `writable` = %d WHERE `id` = %d",
 384                                         intval($writable),
 385                                         intval($contact_id)
 386                                 );
 387                         }
 388                 }
 389
 390                 header("Content-type: application/atom+xml");
 391                 $o = DFRN::feed($dfrn_id, $a->argv[1], $last_update, $direction);
 392                 echo $o;
 393                 killme();
 394
 395         }
 396 }
 397
 398 function dfrn_poll_content(App $a) {
 399
 400         $dfrn_id         = ((x($_GET,'dfrn_id'))         ? $_GET['dfrn_id']              : '');
 401         $type            = ((x($_GET,'type'))            ? $_GET['type']                 : 'data');
 402         $last_update     = ((x($_GET,'last_update'))     ? $_GET['last_update']          : '');
 403         $destination_url = ((x($_GET,'destination_url')) ? $_GET['destination_url']      : '');
 404         $sec             = ((x($_GET,'sec'))             ? $_GET['sec']                  : '');
 405         $dfrn_version    = ((x($_GET,'dfrn_version'))    ? (float) $_GET['dfrn_version'] : 2.0);
 406         $perm            = ((x($_GET,'perm'))            ? $_GET['perm']                 : 'r');
 407         $quiet           = ((x($_GET,'quiet'))           ? true                          : false);
 408
 409         $direction = (-1);
 410         if(strpos($dfrn_id,':') == 1) {
 411                 $direction = intval(substr($dfrn_id,0,1));
 412                 $dfrn_id = substr($dfrn_id,2);
 413         }
 414
 415
 416         if($dfrn_id != '') {
 417                 // initial communication from external contact
 418                 $hash = random_string();
 419
 420                 $status = 0;
 421
 422                 $r = q("DELETE FROM `challenge` WHERE `expire` < " . intval(time()));
 423
 424                 if($type !== 'profile') {
 425                         $r = q("INSERT INTO `challenge` ( `challenge`, `dfrn-id`, `expire` , `type`, `last_update` )
 426                                 VALUES( '%s', '%s', '%s', '%s', '%s' ) ",
 427                                 dbesc($hash),
 428                                 dbesc($dfrn_id),
 429                                 intval(time() + 60 ),
 430                                 dbesc($type),
 431                                 dbesc($last_update)
 432                         );
 433                 }
 434                 $sql_extra = '';
 435                 switch($direction) {
 436                         case (-1):
 437                                 if($type === 'profile')
 438                                         $sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", dbesc($dfrn_id),dbesc($dfrn_id));
 439                                 else
 440                                         $sql_extra = sprintf(" AND `issued-id` = '%s' ", dbesc($dfrn_id));
 441                                 $my_id = $dfrn_id;
 442                                 break;
 443                         case 0:
 444                                 $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 445                                 $my_id = '1:' . $dfrn_id;
 446                                 break;
 447                         case 1:
 448                                 $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 449                                 $my_id = '0:' . $dfrn_id;
 450                                 break;
 451                         default:
 452                                 goaway(System::baseUrl());
 453                                 break; // NOTREACHED
 454                 }
 455
 456                 $nickname = $a->argv[1];
 457
 458                 $r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname`
 459                         FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
 460                         WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
 461                         AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
 462                         dbesc($nickname)
 463                 );
 464
 465                 if (DBM::is_result($r)) {
 466
 467                         $challenge = '';
 468                         $encrypted_id = '';
 469                         $id_str = $my_id . '.' . mt_rand(1000,9999);
 470
 471                         if(($r[0]['duplex'] && strlen($r[0]['pubkey'])) || (! strlen($r[0]['prvkey']))) {
 472                                 openssl_public_encrypt($hash,$challenge,$r[0]['pubkey']);
 473                                 openssl_public_encrypt($id_str,$encrypted_id,$r[0]['pubkey']);
 474                         }
 475                         else {
 476                                 openssl_private_encrypt($hash,$challenge,$r[0]['prvkey']);
 477                                 openssl_private_encrypt($id_str,$encrypted_id,$r[0]['prvkey']);
 478                         }
 479
 480                         $challenge = bin2hex($challenge);
 481                         $encrypted_id = bin2hex($encrypted_id);
 482                 }
 483                 else {
 484                         $status = 1;
 485                         $challenge = '';
 486                         $encrypted_id = '';
 487                 }
 488
 489                 if(($type === 'profile') && (strlen($sec))) {
 490
 491                         // URL reply
 492
 493                         if($dfrn_version < 2.2) {
 494                                 $s = fetch_url($r[0]['poll']
 495                                         . '?dfrn_id=' . $encrypted_id
 496                                         . '&type=profile-check'
 497                                         . '&dfrn_version=' . DFRN_PROTOCOL_VERSION
 498                                         . '&challenge=' . $challenge
 499                                         . '&sec=' . $sec
 500                                 );
 501                         }
 502                         else {
 503                                 $s = post_url($r[0]['poll'], array(
 504                                         'dfrn_id' => $encrypted_id,
 505                                         'type' => 'profile-check',
 506                                         'dfrn_version' => DFRN_PROTOCOL_VERSION,
 507                                         'challenge' => $challenge,
 508                                         'sec' => $sec
 509                                 ));
 510                         }
 511
 512                         $profile = ((DBM::is_result($r) && $r[0]['nickname']) ? $r[0]['nickname'] : $nickname);
 513
 514                         switch($destination_url) {
 515                                 case 'profile':
 516                                         $dest = System::baseUrl() . '/profile/' . $profile . '?f=&tab=profile';
 517                                         break;
 518                                 case 'photos':
 519                                         $dest = System::baseUrl() . '/photos/' . $profile;
 520                                         break;
 521                                 case 'status':
 522                                 case '':
 523                                         $dest = System::baseUrl() . '/profile/' . $profile;
 524                                         break;
 525                                 default:
 526                                         $appendix = (strstr($destination_url, '?') ? '&f=&redir=1' : '?f=&redir=1');
 527                                         $dest = $destination_url . $appendix;
 528                                         break;
 529                         }
 530
 531                         logger("dfrn_poll: sec profile: " . $s, LOGGER_DATA);
 532
 533                         if(strlen($s) && strstr($s,'<?xml')) {
 534
 535                                 $xml = parse_xml_string($s);
 536
 537                                 logger('dfrn_poll: profile: parsed xml: ' . print_r($xml,true), LOGGER_DATA);
 538
 539                                 logger('dfrn_poll: secure profile: challenge: ' . $xml->challenge . ' expecting ' . $hash);
 540                                 logger('dfrn_poll: secure profile: sec: ' . $xml->sec . ' expecting ' . $sec);
 541
 542
 543                                 if(((int) $xml->status == 0) && ($xml->challenge == $hash)  && ($xml->sec == $sec)) {
 544                                         $_SESSION['authenticated'] = 1;
 545                                         if(! x($_SESSION,'remote'))
 546                                                 $_SESSION['remote'] = array();
 547                                         $_SESSION['remote'][] = array('cid' => $r[0]['id'],'uid' => $r[0]['uid'],'url' => $r[0]['url']);
 548                                         $_SESSION['visitor_id'] = $r[0]['id'];
 549                                         $_SESSION['visitor_home'] = $r[0]['url'];
 550                                         $_SESSION['visitor_visiting'] = $r[0]['uid'];
 551                                         if(!$quiet)
 552                                                 info( sprintf(t('%1$s welcomes %2$s'), $r[0]['username'] , $r[0]['name']) . EOL);
 553                                         // Visitors get 1 day session.
 554                                         $session_id = session_id();
 555                                         $expire = time() + 86400;
 556                                         q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s'",
 557                                                 dbesc($expire),
 558                                                 dbesc($session_id)
 559                                         );
 560                                 }
 561
 562                                 goaway($dest);
 563                         }
 564                         goaway($dest);
 565                         // NOTREACHED
 566
 567                 }
 568                 else {
 569                         // XML reply
 570                         header("Content-type: text/xml");
 571                         echo '<?xml version="1.0" encoding="UTF-8"?>' . "\r\n"
 572                                 . '<dfrn_poll>' . "\r\n"
 573                                 . "\t" . '<status>' . $status . '</status>' . "\r\n"
 574                                 . "\t" . '<dfrn_version>' . DFRN_PROTOCOL_VERSION . '</dfrn_version>' . "\r\n"
 575                                 . "\t" . '<dfrn_id>' . $encrypted_id . '</dfrn_id>' . "\r\n"
 576                                 . "\t" . '<challenge>' . $challenge . '</challenge>' . "\r\n"
 577                                 . '</dfrn_poll>' . "\r\n" ;
 578                         killme();
 579                         // NOTREACHED
 580                 }
 581         }
 582 }