mod/dfrn_poll.php

   1 <?php
   2 require_once('include/items.php');
   3 require_once('include/auth.php');
   4 require_once('include/dfrn.php');
   5
   6 function dfrn_poll_init(App $a) {
   7         $dfrn_id         = ((x($_GET,'dfrn_id'))         ? $_GET['dfrn_id']              : '');
   8         $type            = ((x($_GET,'type'))            ? $_GET['type']                 : 'data');
   9         $last_update     = ((x($_GET,'last_update'))     ? $_GET['last_update']          : '');
  10         $destination_url = ((x($_GET,'destination_url')) ? $_GET['destination_url']      : '');
  11         $challenge       = ((x($_GET,'challenge'))       ? $_GET['challenge']            : '');
  12         $sec             = ((x($_GET,'sec'))             ? $_GET['sec']                  : '');
  13         $dfrn_version    = ((x($_GET,'dfrn_version'))    ? (float) $_GET['dfrn_version'] : 2.0);
  14         $perm            = ((x($_GET,'perm'))            ? $_GET['perm']                 : 'r');
  15         $quiet                   = ((x($_GET,'quiet'))                   ? true                                                  : false);
  16
  17         $direction = (-1);
  18
  19
  20         if(strpos($dfrn_id,':') == 1) {
  21                 $direction = intval(substr($dfrn_id,0,1));
  22                 $dfrn_id   = substr($dfrn_id,2);
  23         }
  24
  25         $hidewall = false;
  26
  27         if(($dfrn_id === '') && (! x($_POST,'dfrn_id'))) {
  28                 if((get_config('system','block_public')) && (! local_user()) && (! remote_user())) {
  29                         http_status_exit(403);
  30                 }
  31
  32                 $user = '';
  33                 if($a->argc > 1) {
  34                         $r = q("SELECT `hidewall`,`nickname` FROM `user` WHERE `user`.`nickname` = '%s' LIMIT 1",
  35                                 dbesc($a->argv[1])
  36                         );
  37                         if (!$r)
  38                                 http_status_exit(404);
  39
  40                         $hidewall = ($r[0]['hidewall'] && !local_user());
  41
  42                         $user = $r[0]['nickname'];
  43                 }
  44
  45                 logger('dfrn_poll: public feed request from ' . $_SERVER['REMOTE_ADDR'] . ' for ' . $user);
  46                 header("Content-type: application/atom+xml");
  47                 echo dfrn::feed('', $user,$last_update, 0, $hidewall);
  48                 killme();
  49         }
  50
  51         if(($type === 'profile') && (! strlen($sec))) {
  52
  53                 $sql_extra = '';
  54                 switch($direction) {
  55                         case (-1):
  56                                 $sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", dbesc($dfrn_id),dbesc($dfrn_id));
  57                                 $my_id = $dfrn_id;
  58                                 break;
  59                         case 0:
  60                                 $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
  61                                 $my_id = '1:' . $dfrn_id;
  62                                 break;
  63                         case 1:
  64                                 $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
  65                                 $my_id = '0:' . $dfrn_id;
  66                                 break;
  67                         default:
  68                                 goaway(z_root());
  69                                 break; // NOTREACHED
  70                 }
  71
  72                 $r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname`
  73                         FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
  74                         WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
  75                         AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
  76                         dbesc($a->argv[1])
  77                 );
  78
  79                 if (dbm::is_result($r)) {
  80
  81                         $s = fetch_url($r[0]['poll'] . '?dfrn_id=' . $my_id . '&type=profile-check');
  82
  83                         logger("dfrn_poll: old profile returns " . $s, LOGGER_DATA);
  84
  85                         if(strlen($s)) {
  86
  87                                 $xml = parse_xml_string($s);
  88
  89                                 if((int) $xml->status == 1) {
  90                                         $_SESSION['authenticated'] = 1;
  91                                         if(! x($_SESSION,'remote'))
  92                                                 $_SESSION['remote'] = array();
  93
  94                                         $_SESSION['remote'][] = array('cid' => $r[0]['id'],'uid' => $r[0]['uid'],'url' => $r[0]['url']);
  95
  96                                         $_SESSION['visitor_id'] = $r[0]['id'];
  97                                         $_SESSION['visitor_home'] = $r[0]['url'];
  98                                         $_SESSION['visitor_handle'] = $r[0]['addr'];
  99                                         $_SESSION['visitor_visiting'] = $r[0]['uid'];
 100                                         if(!$quiet)
 101                                                 info( sprintf(t('%1$s welcomes %2$s'), $r[0]['username'] , $r[0]['name']) . EOL);
 102                                         // Visitors get 1 day session.
 103                                         $session_id = session_id();
 104                                         $expire = time() + 86400;
 105                                         q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s'",
 106                                                 dbesc($expire),
 107                                                 dbesc($session_id)
 108                                         );
 109                                 }
 110                         }
 111                         $profile = $r[0]['nickname'];
 112                         goaway((strlen($destination_url)) ? $destination_url : App::get_baseurl() . '/profile/' . $profile);
 113                 }
 114                 goaway(z_root());
 115
 116         }
 117
 118         if($type === 'profile-check' && $dfrn_version < 2.2 ) {
 119
 120                 if((strlen($challenge)) && (strlen($sec))) {
 121
 122                         q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
 123                         $r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1",
 124                                 dbesc($sec)
 125                         );
 126                         if (! dbm::is_result($r)) {
 127                                 xml_status(3, 'No ticket');
 128                                 // NOTREACHED
 129                         }
 130                         $orig_id = $r[0]['dfrn_id'];
 131                         if(strpos($orig_id, ':'))
 132                                 $orig_id = substr($orig_id,2);
 133
 134                         $c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
 135                                 intval($r[0]['cid'])
 136                         );
 137                         if (! dbm::is_result($c)) {
 138                                 xml_status(3, 'No profile');
 139                         }
 140                         $contact = $c[0];
 141
 142                         $sent_dfrn_id = hex2bin($dfrn_id);
 143                         $challenge    = hex2bin($challenge);
 144
 145                         $final_dfrn_id = '';
 146
 147                         if(($contact['duplex']) && strlen($contact['prvkey'])) {
 148                                 openssl_private_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['prvkey']);
 149                                 openssl_private_decrypt($challenge,$decoded_challenge,$contact['prvkey']);
 150                         }
 151                         else {
 152                                 openssl_public_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['pubkey']);
 153                                 openssl_public_decrypt($challenge,$decoded_challenge,$contact['pubkey']);
 154                         }
 155
 156                         $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
 157
 158                         if(strpos($final_dfrn_id,':') == 1)
 159                                 $final_dfrn_id = substr($final_dfrn_id,2);
 160
 161                         if($final_dfrn_id != $orig_id) {
 162                                 logger('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, LOGGER_DEBUG);
 163                                 // did not decode properly - cannot trust this site
 164                                 xml_status(3, 'Bad decryption');
 165                         }
 166
 167                         header("Content-type: text/xml");
 168                         echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
 169                         killme();
 170                         // NOTREACHED
 171                 }
 172                 else {
 173                                 // old protocol
 174
 175                         switch($direction) {
 176                                 case 1:
 177                                         $dfrn_id = '0:' . $dfrn_id;
 178                                         break;
 179                                 case 0:
 180                                         $dfrn_id = '1:' . $dfrn_id;
 181                                         break;
 182                                 default:
 183                                         break;
 184                         }
 185
 186
 187                         q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
 188                         $r = q("SELECT * FROM `profile_check` WHERE `dfrn_id` = '%s' ORDER BY `expire` DESC",
 189                                 dbesc($dfrn_id));
 190                         if (dbm::is_result($r)) {
 191                                 xml_status(1);
 192                                 return; // NOTREACHED
 193                         }
 194                         xml_status(0);
 195                         return; // NOTREACHED
 196                 }
 197         }
 198
 199 }
 200
 201
 202
 203 function dfrn_poll_post(App $a) {
 204
 205         $dfrn_id      = ((x($_POST,'dfrn_id'))      ? $_POST['dfrn_id']              : '');
 206         $challenge    = ((x($_POST,'challenge'))    ? $_POST['challenge']            : '');
 207         $url          = ((x($_POST,'url'))          ? $_POST['url']                  : '');
 208         $sec          = ((x($_POST,'sec'))          ? $_POST['sec']                  : '');
 209         $ptype        = ((x($_POST,'type'))         ? $_POST['type']                 : '');
 210         $dfrn_version = ((x($_POST,'dfrn_version')) ? (float) $_POST['dfrn_version'] : 2.0);
 211         $perm         = ((x($_POST,'perm'))         ? $_POST['perm']                 : 'r');
 212
 213         if($ptype === 'profile-check') {
 214
 215                 if((strlen($challenge)) && (strlen($sec))) {
 216
 217                         logger('dfrn_poll: POST: profile-check');
 218
 219                         q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
 220                         $r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1",
 221                                 dbesc($sec)
 222                         );
 223                         if (! dbm::is_result($r)) {
 224                                 xml_status(3, 'No ticket');
 225                                 // NOTREACHED
 226                         }
 227                         $orig_id = $r[0]['dfrn_id'];
 228                         if(strpos($orig_id, ':'))
 229                                 $orig_id = substr($orig_id,2);
 230
 231                         $c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
 232                                 intval($r[0]['cid'])
 233                         );
 234                         if (! dbm::is_result($c)) {
 235                                 xml_status(3, 'No profile');
 236                         }
 237                         $contact = $c[0];
 238
 239                         $sent_dfrn_id = hex2bin($dfrn_id);
 240                         $challenge    = hex2bin($challenge);
 241
 242                         $final_dfrn_id = '';
 243
 244                         if(($contact['duplex']) && strlen($contact['prvkey'])) {
 245                                 openssl_private_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['prvkey']);
 246                                 openssl_private_decrypt($challenge,$decoded_challenge,$contact['prvkey']);
 247                         }
 248                         else {
 249                                 openssl_public_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['pubkey']);
 250                                 openssl_public_decrypt($challenge,$decoded_challenge,$contact['pubkey']);
 251                         }
 252
 253                         $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
 254
 255                         if(strpos($final_dfrn_id,':') == 1)
 256                                 $final_dfrn_id = substr($final_dfrn_id,2);
 257
 258                         if($final_dfrn_id != $orig_id) {
 259                                 logger('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, LOGGER_DEBUG);
 260                                 // did not decode properly - cannot trust this site
 261                                 xml_status(3, 'Bad decryption');
 262                         }
 263
 264                         header("Content-type: text/xml");
 265                         echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
 266                         killme();
 267                         // NOTREACHED
 268                 }
 269
 270         }
 271
 272         $direction    = (-1);
 273         if(strpos($dfrn_id,':') == 1) {
 274                 $direction = intval(substr($dfrn_id,0,1));
 275                 $dfrn_id   = substr($dfrn_id,2);
 276         }
 277
 278
 279         $r = q("SELECT * FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s' LIMIT 1",
 280                 dbesc($dfrn_id),
 281                 dbesc($challenge)
 282         );
 283
 284         if (! dbm::is_result($r)) {
 285                 killme();
 286         }
 287
 288         $type = $r[0]['type'];
 289         $last_update = $r[0]['last_update'];
 290
 291         $r = q("DELETE FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s'",
 292                 dbesc($dfrn_id),
 293                 dbesc($challenge)
 294         );
 295
 296
 297         $sql_extra = '';
 298         switch($direction) {
 299                 case (-1):
 300                         $sql_extra = sprintf(" AND `issued-id` = '%s' ", dbesc($dfrn_id));
 301                         $my_id = $dfrn_id;
 302                         break;
 303                 case 0:
 304                         $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 305                         $my_id = '1:' . $dfrn_id;
 306                         break;
 307                 case 1:
 308                         $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 309                         $my_id = '0:' . $dfrn_id;
 310                         break;
 311                 default:
 312                         goaway(z_root());
 313                         break; // NOTREACHED
 314         }
 315
 316
 317         $r = q("SELECT * FROM `contact` WHERE `blocked` = 0 AND `pending` = 0 $sql_extra LIMIT 1");
 318
 319
 320         if (! dbm::is_result($r)) {
 321                 killme();
 322         }
 323
 324         $contact = $r[0];
 325         $owner_uid = $r[0]['uid'];
 326         $contact_id = $r[0]['id'];
 327
 328
 329         if($type === 'reputation' && strlen($url)) {
 330                 $r = q("SELECT * FROM `contact` WHERE `url` = '%s' AND `uid` = %d LIMIT 1",
 331                         dbesc($url),
 332                         intval($owner_uid)
 333                 );
 334                 $reputation = 0;
 335                 $text = '';
 336
 337                 if (dbm::is_result($r)) {
 338                         $reputation = $r[0]['rating'];
 339                         $text = $r[0]['reason'];
 340
 341                         if($r[0]['id'] == $contact_id) {        // inquiring about own reputation not allowed
 342                                 $reputation = 0;
 343                                 $text = '';
 344                         }
 345                 }
 346
 347                 echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
 348                 <reputation>
 349                         <url>$url</url>
 350                         <rating>$reputation</rating>
 351                         <description>$text</description>
 352                 </reputation>
 353                 ";
 354                 killme();
 355                 // NOTREACHED
 356         }
 357         else {
 358
 359                 // Update the writable flag if it changed
 360                 logger('dfrn_poll: post request feed: ' . print_r($_POST,true),LOGGER_DATA);
 361                 if($dfrn_version >= 2.21) {
 362                         if($perm === 'rw')
 363                                 $writable = 1;
 364                         else
 365                                 $writable = 0;
 366
 367                         if($writable !=  $contact['writable']) {
 368                                 q("UPDATE `contact` SET `writable` = %d WHERE `id` = %d",
 369                                         intval($writable),
 370                                         intval($contact_id)
 371                                 );
 372                         }
 373                 }
 374
 375                 header("Content-type: application/atom+xml");
 376                 $o = dfrn::feed($dfrn_id, $a->argv[1], $last_update, $direction);
 377                 echo $o;
 378                 killme();
 379
 380         }
 381 }
 382
 383 function dfrn_poll_content(App $a) {
 384
 385         $dfrn_id         = ((x($_GET,'dfrn_id'))         ? $_GET['dfrn_id']              : '');
 386         $type            = ((x($_GET,'type'))            ? $_GET['type']                 : 'data');
 387         $last_update     = ((x($_GET,'last_update'))     ? $_GET['last_update']          : '');
 388         $destination_url = ((x($_GET,'destination_url')) ? $_GET['destination_url']      : '');
 389         $sec             = ((x($_GET,'sec'))             ? $_GET['sec']                  : '');
 390         $dfrn_version    = ((x($_GET,'dfrn_version'))    ? (float) $_GET['dfrn_version'] : 2.0);
 391         $perm            = ((x($_GET,'perm'))            ? $_GET['perm']                 : 'r');
 392         $quiet           = ((x($_GET,'quiet'))           ? true                          : false);
 393
 394         $direction = (-1);
 395         if(strpos($dfrn_id,':') == 1) {
 396                 $direction = intval(substr($dfrn_id,0,1));
 397                 $dfrn_id = substr($dfrn_id,2);
 398         }
 399
 400
 401         if($dfrn_id != '') {
 402                 // initial communication from external contact
 403                 $hash = random_string();
 404
 405                 $status = 0;
 406
 407                 $r = q("DELETE FROM `challenge` WHERE `expire` < " . intval(time()));
 408
 409                 if($type !== 'profile') {
 410                         $r = q("INSERT INTO `challenge` ( `challenge`, `dfrn-id`, `expire` , `type`, `last_update` )
 411                                 VALUES( '%s', '%s', '%s', '%s', '%s' ) ",
 412                                 dbesc($hash),
 413                                 dbesc($dfrn_id),
 414                                 intval(time() + 60 ),
 415                                 dbesc($type),
 416                                 dbesc($last_update)
 417                         );
 418                 }
 419                 $sql_extra = '';
 420                 switch($direction) {
 421                         case (-1):
 422                                 if($type === 'profile')
 423                                         $sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", dbesc($dfrn_id),dbesc($dfrn_id));
 424                                 else
 425                                         $sql_extra = sprintf(" AND `issued-id` = '%s' ", dbesc($dfrn_id));
 426                                 $my_id = $dfrn_id;
 427                                 break;
 428                         case 0:
 429                                 $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 430                                 $my_id = '1:' . $dfrn_id;
 431                                 break;
 432                         case 1:
 433                                 $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 434                                 $my_id = '0:' . $dfrn_id;
 435                                 break;
 436                         default:
 437                                 goaway(z_root());
 438                                 break; // NOTREACHED
 439                 }
 440
 441                 $nickname = $a->argv[1];
 442
 443                 $r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname`
 444                         FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
 445                         WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
 446                         AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
 447                         dbesc($nickname)
 448                 );
 449
 450                 if (dbm::is_result($r)) {
 451
 452                         $challenge = '';
 453                         $encrypted_id = '';
 454                         $id_str = $my_id . '.' . mt_rand(1000,9999);
 455
 456                         if(($r[0]['duplex'] && strlen($r[0]['pubkey'])) || (! strlen($r[0]['prvkey']))) {
 457                                 openssl_public_encrypt($hash,$challenge,$r[0]['pubkey']);
 458                                 openssl_public_encrypt($id_str,$encrypted_id,$r[0]['pubkey']);
 459                         }
 460                         else {
 461                                 openssl_private_encrypt($hash,$challenge,$r[0]['prvkey']);
 462                                 openssl_private_encrypt($id_str,$encrypted_id,$r[0]['prvkey']);
 463                         }
 464
 465                         $challenge = bin2hex($challenge);
 466                         $encrypted_id = bin2hex($encrypted_id);
 467                 }
 468                 else {
 469                         $status = 1;
 470                         $challenge = '';
 471                         $encrypted_id = '';
 472                 }
 473
 474                 if(($type === 'profile') && (strlen($sec))) {
 475
 476                         // URL reply
 477
 478                         if($dfrn_version < 2.2) {
 479                                 $s = fetch_url($r[0]['poll']
 480                                         . '?dfrn_id=' . $encrypted_id
 481                                         . '&type=profile-check'
 482                                         . '&dfrn_version=' . DFRN_PROTOCOL_VERSION
 483                                         . '&challenge=' . $challenge
 484                                         . '&sec=' . $sec
 485                                 );
 486                         }
 487                         else {
 488                                 $s = post_url($r[0]['poll'], array(
 489                                         'dfrn_id' => $encrypted_id,
 490                                         'type' => 'profile-check',
 491                                         'dfrn_version' => DFRN_PROTOCOL_VERSION,
 492                                         'challenge' => $challenge,
 493                                         'sec' => $sec
 494                                 ));
 495                         }
 496
 497                         $profile = ((dbm::is_result($r) && $r[0]['nickname']) ? $r[0]['nickname'] : $nickname);
 498
 499                         switch($destination_url) {
 500                                 case 'profile':
 501                                         $dest = App::get_baseurl() . '/profile/' . $profile . '?f=&tab=profile';
 502                                         break;
 503                                 case 'photos':
 504                                         $dest = App::get_baseurl() . '/photos/' . $profile;
 505                                         break;
 506                                 case 'status':
 507                                 case '':
 508                                         $dest = App::get_baseurl() . '/profile/' . $profile;
 509                                         break;
 510                                 default:
 511                                         $dest = $destination_url . '?f=&redir=1';
 512                                         break;
 513                         }
 514
 515                         logger("dfrn_poll: sec profile: " . $s, LOGGER_DATA);
 516
 517                         if(strlen($s) && strstr($s,'<?xml')) {
 518
 519                                 $xml = parse_xml_string($s);
 520
 521                                 logger('dfrn_poll: profile: parsed xml: ' . print_r($xml,true), LOGGER_DATA);
 522
 523                                 logger('dfrn_poll: secure profile: challenge: ' . $xml->challenge . ' expecting ' . $hash);
 524                                 logger('dfrn_poll: secure profile: sec: ' . $xml->sec . ' expecting ' . $sec);
 525
 526
 527                                 if(((int) $xml->status == 0) && ($xml->challenge == $hash)  && ($xml->sec == $sec)) {
 528                                         $_SESSION['authenticated'] = 1;
 529                                         if(! x($_SESSION,'remote'))
 530                                                 $_SESSION['remote'] = array();
 531                                         $_SESSION['remote'][] = array('cid' => $r[0]['id'],'uid' => $r[0]['uid'],'url' => $r[0]['url']);
 532                                         $_SESSION['visitor_id'] = $r[0]['id'];
 533                                         $_SESSION['visitor_home'] = $r[0]['url'];
 534                                         $_SESSION['visitor_visiting'] = $r[0]['uid'];
 535                                         if(!$quiet)
 536                                                 info( sprintf(t('%1$s welcomes %2$s'), $r[0]['username'] , $r[0]['name']) . EOL);
 537                                         // Visitors get 1 day session.
 538                                         $session_id = session_id();
 539                                         $expire = time() + 86400;
 540                                         q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s'",
 541                                                 dbesc($expire),
 542                                                 dbesc($session_id)
 543                                         );
 544                                 }
 545
 546                                 goaway($dest);
 547                         }
 548                         goaway($dest);
 549                         // NOTREACHED
 550
 551                 }
 552                 else {
 553                         // XML reply
 554                         header("Content-type: text/xml");
 555                         echo '<?xml version="1.0" encoding="UTF-8"?>' . "\r\n"
 556                                 . '<dfrn_poll>' . "\r\n"
 557                                 . "\t" . '<status>' . $status . '</status>' . "\r\n"
 558                                 . "\t" . '<dfrn_version>' . DFRN_PROTOCOL_VERSION . '</dfrn_version>' . "\r\n"
 559                                 . "\t" . '<dfrn_id>' . $encrypted_id . '</dfrn_id>' . "\r\n"
 560                                 . "\t" . '<challenge>' . $challenge . '</challenge>' . "\r\n"
 561                                 . '</dfrn_poll>' . "\r\n" ;
 562                         killme();
 563                         // NOTREACHED
 564                 }
 565         }
 566 }