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
   7 function dfrn_poll_init(&$a) {
   8
   9
  10         $dfrn_id         = ((x($_GET,'dfrn_id'))         ? $_GET['dfrn_id']              : '');
  11         $type            = ((x($_GET,'type'))            ? $_GET['type']                 : 'data');
  12         $last_update     = ((x($_GET,'last_update'))     ? $_GET['last_update']          : '');
  13         $destination_url = ((x($_GET,'destination_url')) ? $_GET['destination_url']      : '');
  14         $challenge       = ((x($_GET,'challenge'))       ? $_GET['challenge']            : '');
  15         $sec             = ((x($_GET,'sec'))             ? $_GET['sec']                  : '');
  16         $dfrn_version    = ((x($_GET,'dfrn_version'))    ? (float) $_GET['dfrn_version'] : 2.0);
  17         $perm            = ((x($_GET,'perm'))            ? $_GET['perm']                 : 'r');
  18         $quiet                   = ((x($_GET,'quiet'))                   ? true                                                  : false);
  19
  20         $direction = (-1);
  21
  22
  23         if(strpos($dfrn_id,':') == 1) {
  24                 $direction = intval(substr($dfrn_id,0,1));
  25                 $dfrn_id   = substr($dfrn_id,2);
  26         }
  27
  28         $hidewall = false;
  29
  30         if(($dfrn_id === '') && (! x($_POST,'dfrn_id'))) {
  31                 if((get_config('system','block_public')) && (! local_user()) && (! remote_user())) {
  32                         http_status_exit(403);
  33                 }
  34
  35                 $user = '';
  36                 if($a->argc > 1) {
  37                         $r = q("SELECT `hidewall`,`nickname` FROM `user` WHERE `user`.`nickname` = '%s' LIMIT 1",
  38                                 dbesc($a->argv[1])
  39                         );
  40                         if (!$r)
  41                                 http_status_exit(404);
  42
  43                         $hidewall = ($r[0]['hidewall'] && !local_user());
  44
  45                         $user = $r[0]['nickname'];
  46                 }
  47
  48                 logger('dfrn_poll: public feed request from ' . $_SERVER['REMOTE_ADDR'] . ' for ' . $user);
  49                 header("Content-type: application/atom+xml");
  50                 echo dfrn::feed('', $user,$last_update, 0, $hidewall);
  51                 killme();
  52         }
  53
  54         if(($type === 'profile') && (! strlen($sec))) {
  55
  56                 $sql_extra = '';
  57                 switch($direction) {
  58                         case (-1):
  59                                 $sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", dbesc($dfrn_id),dbesc($dfrn_id));
  60                                 $my_id = $dfrn_id;
  61                                 break;
  62                         case 0:
  63                                 $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
  64                                 $my_id = '1:' . $dfrn_id;
  65                                 break;
  66                         case 1:
  67                                 $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
  68                                 $my_id = '0:' . $dfrn_id;
  69                                 break;
  70                         default:
  71                                 goaway(z_root());
  72                                 break; // NOTREACHED
  73                 }
  74
  75                 $r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname`
  76                         FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
  77                         WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
  78                         AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
  79                         dbesc($a->argv[1])
  80                 );
  81
  82                 if (dbm::is_result($r)) {
  83
  84                         $s = fetch_url($r[0]['poll'] . '?dfrn_id=' . $my_id . '&type=profile-check');
  85
  86                         logger("dfrn_poll: old profile returns " . $s, LOGGER_DATA);
  87
  88                         if(strlen($s)) {
  89
  90                                 $xml = parse_xml_string($s);
  91
  92                                 if((int) $xml->status == 1) {
  93                                         $_SESSION['authenticated'] = 1;
  94                                         if(! x($_SESSION,'remote'))
  95                                                 $_SESSION['remote'] = array();
  96
  97                                         $_SESSION['remote'][] = array('cid' => $r[0]['id'],'uid' => $r[0]['uid'],'url' => $r[0]['url']);
  98
  99                                         $_SESSION['visitor_id'] = $r[0]['id'];
 100                                         $_SESSION['visitor_home'] = $r[0]['url'];
 101                                         $_SESSION['visitor_handle'] = $r[0]['addr'];
 102                                         $_SESSION['visitor_visiting'] = $r[0]['uid'];
 103                                         if(!$quiet)
 104                                                 info( sprintf(t('%1$s welcomes %2$s'), $r[0]['username'] , $r[0]['name']) . EOL);
 105                                         // Visitors get 1 day session.
 106                                         $session_id = session_id();
 107                                         $expire = time() + 86400;
 108                                         q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s'",
 109                                                 dbesc($expire),
 110                                                 dbesc($session_id)
 111                                         );
 112                                 }
 113                         }
 114                         $profile = $r[0]['nickname'];
 115                         goaway((strlen($destination_url)) ? $destination_url : $a->get_baseurl() . '/profile/' . $profile);
 116                 }
 117                 goaway(z_root());
 118
 119         }
 120
 121         if($type === 'profile-check' && $dfrn_version < 2.2 ) {
 122
 123                 if((strlen($challenge)) && (strlen($sec))) {
 124
 125                         q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
 126                         $r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1",
 127                                 dbesc($sec)
 128                         );
 129                         if(! dbm::is_result($r)) {
 130                                 xml_status(3, 'No ticket');
 131                                 // NOTREACHED
 132                         }
 133                         $orig_id = $r[0]['dfrn_id'];
 134                         if(strpos($orig_id, ':'))
 135                                 $orig_id = substr($orig_id,2);
 136
 137                         $c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
 138                                 intval($r[0]['cid'])
 139                         );
 140                         if(! count($c)) {
 141                                 xml_status(3, 'No profile');
 142                         }
 143                         $contact = $c[0];
 144
 145                         $sent_dfrn_id = hex2bin($dfrn_id);
 146                         $challenge    = hex2bin($challenge);
 147
 148                         $final_dfrn_id = '';
 149
 150                         if(($contact['duplex']) && strlen($contact['prvkey'])) {
 151                                 openssl_private_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['prvkey']);
 152                                 openssl_private_decrypt($challenge,$decoded_challenge,$contact['prvkey']);
 153                         }
 154                         else {
 155                                 openssl_public_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['pubkey']);
 156                                 openssl_public_decrypt($challenge,$decoded_challenge,$contact['pubkey']);
 157                         }
 158
 159                         $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
 160
 161                         if(strpos($final_dfrn_id,':') == 1)
 162                                 $final_dfrn_id = substr($final_dfrn_id,2);
 163
 164                         if($final_dfrn_id != $orig_id) {
 165                                 logger('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, LOGGER_DEBUG);
 166                                 // did not decode properly - cannot trust this site
 167                                 xml_status(3, 'Bad decryption');
 168                         }
 169
 170                         header("Content-type: text/xml");
 171                         echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
 172                         killme();
 173                         // NOTREACHED
 174                 }
 175                 else {
 176                                 // old protocol
 177
 178                         switch($direction) {
 179                                 case 1:
 180                                         $dfrn_id = '0:' . $dfrn_id;
 181                                         break;
 182                                 case 0:
 183                                         $dfrn_id = '1:' . $dfrn_id;
 184                                         break;
 185                                 default:
 186                                         break;
 187                         }
 188
 189
 190                         q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
 191                         $r = q("SELECT * FROM `profile_check` WHERE `dfrn_id` = '%s' ORDER BY `expire` DESC",
 192                                 dbesc($dfrn_id));
 193                         if (dbm::is_result($r)) {
 194                                 xml_status(1);
 195                                 return; // NOTREACHED
 196                         }
 197                         xml_status(0);
 198                         return; // NOTREACHED
 199                 }
 200         }
 201
 202 }
 203
 204
 205
 206 function dfrn_poll_post(&$a) {
 207
 208         $dfrn_id      = ((x($_POST,'dfrn_id'))      ? $_POST['dfrn_id']              : '');
 209         $challenge    = ((x($_POST,'challenge'))    ? $_POST['challenge']            : '');
 210         $url          = ((x($_POST,'url'))          ? $_POST['url']                  : '');
 211         $sec          = ((x($_POST,'sec'))          ? $_POST['sec']                  : '');
 212         $ptype        = ((x($_POST,'type'))         ? $_POST['type']                 : '');
 213         $dfrn_version = ((x($_POST,'dfrn_version')) ? (float) $_POST['dfrn_version'] : 2.0);
 214         $perm         = ((x($_POST,'perm'))         ? $_POST['perm']                 : 'r');
 215
 216         if($ptype === 'profile-check') {
 217
 218                 if((strlen($challenge)) && (strlen($sec))) {
 219
 220                         logger('dfrn_poll: POST: profile-check');
 221
 222                         q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
 223                         $r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1",
 224                                 dbesc($sec)
 225                         );
 226                         if(! dbm::is_result($r)) {
 227                                 xml_status(3, 'No ticket');
 228                                 // NOTREACHED
 229                         }
 230                         $orig_id = $r[0]['dfrn_id'];
 231                         if(strpos($orig_id, ':'))
 232                                 $orig_id = substr($orig_id,2);
 233
 234                         $c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
 235                                 intval($r[0]['cid'])
 236                         );
 237                         if(! count($c)) {
 238                                 xml_status(3, 'No profile');
 239                         }
 240                         $contact = $c[0];
 241
 242                         $sent_dfrn_id = hex2bin($dfrn_id);
 243                         $challenge    = hex2bin($challenge);
 244
 245                         $final_dfrn_id = '';
 246
 247                         if(($contact['duplex']) && strlen($contact['prvkey'])) {
 248                                 openssl_private_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['prvkey']);
 249                                 openssl_private_decrypt($challenge,$decoded_challenge,$contact['prvkey']);
 250                         }
 251                         else {
 252                                 openssl_public_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['pubkey']);
 253                                 openssl_public_decrypt($challenge,$decoded_challenge,$contact['pubkey']);
 254                         }
 255
 256                         $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
 257
 258                         if(strpos($final_dfrn_id,':') == 1)
 259                                 $final_dfrn_id = substr($final_dfrn_id,2);
 260
 261                         if($final_dfrn_id != $orig_id) {
 262                                 logger('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, LOGGER_DEBUG);
 263                                 // did not decode properly - cannot trust this site
 264                                 xml_status(3, 'Bad decryption');
 265                         }
 266
 267                         header("Content-type: text/xml");
 268                         echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
 269                         killme();
 270                         // NOTREACHED
 271                 }
 272
 273         }
 274
 275         $direction    = (-1);
 276         if(strpos($dfrn_id,':') == 1) {
 277                 $direction = intval(substr($dfrn_id,0,1));
 278                 $dfrn_id   = substr($dfrn_id,2);
 279         }
 280
 281
 282         $r = q("SELECT * FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s' LIMIT 1",
 283                 dbesc($dfrn_id),
 284                 dbesc($challenge)
 285         );
 286
 287         if(! dbm::is_result($r))
 288                 killme();
 289
 290         $type = $r[0]['type'];
 291         $last_update = $r[0]['last_update'];
 292
 293         $r = q("DELETE FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s'",
 294                 dbesc($dfrn_id),
 295                 dbesc($challenge)
 296         );
 297
 298
 299         $sql_extra = '';
 300         switch($direction) {
 301                 case (-1):
 302                         $sql_extra = sprintf(" AND `issued-id` = '%s' ", dbesc($dfrn_id));
 303                         $my_id = $dfrn_id;
 304                         break;
 305                 case 0:
 306                         $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 307                         $my_id = '1:' . $dfrn_id;
 308                         break;
 309                 case 1:
 310                         $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 311                         $my_id = '0:' . $dfrn_id;
 312                         break;
 313                 default:
 314                         goaway(z_root());
 315                         break; // NOTREACHED
 316         }
 317
 318
 319         $r = q("SELECT * FROM `contact` WHERE `blocked` = 0 AND `pending` = 0 $sql_extra LIMIT 1");
 320
 321
 322         if(! dbm::is_result($r))
 323                 killme();
 324
 325         $contact = $r[0];
 326         $owner_uid = $r[0]['uid'];
 327         $contact_id = $r[0]['id'];
 328
 329
 330         if($type === 'reputation' && strlen($url)) {
 331                 $r = q("SELECT * FROM `contact` WHERE `url` = '%s' AND `uid` = %d LIMIT 1",
 332                         dbesc($url),
 333                         intval($owner_uid)
 334                 );
 335                 $reputation = 0;
 336                 $text = '';
 337
 338                 if (dbm::is_result($r)) {
 339                         $reputation = $r[0]['rating'];
 340                         $text = $r[0]['reason'];
 341
 342                         if($r[0]['id'] == $contact_id) {        // inquiring about own reputation not allowed
 343                                 $reputation = 0;
 344                                 $text = '';
 345                         }
 346                 }
 347
 348                 echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
 349                 <reputation>
 350                         <url>$url</url>
 351                         <rating>$reputation</rating>
 352                         <description>$text</description>
 353                 </reputation>
 354                 ";
 355                 killme();
 356                 // NOTREACHED
 357         }
 358         else {
 359
 360                 // Update the writable flag if it changed
 361                 logger('dfrn_poll: post request feed: ' . print_r($_POST,true),LOGGER_DATA);
 362                 if($dfrn_version >= 2.21) {
 363                         if($perm === 'rw')
 364                                 $writable = 1;
 365                         else
 366                                 $writable = 0;
 367
 368                         if($writable !=  $contact['writable']) {
 369                                 q("UPDATE `contact` SET `writable` = %d WHERE `id` = %d",
 370                                         intval($writable),
 371                                         intval($contact_id)
 372                                 );
 373                         }
 374                 }
 375
 376                 header("Content-type: application/atom+xml");
 377                 $o = dfrn::feed($dfrn_id, $a->argv[1], $last_update, $direction);
 378                 echo $o;
 379                 killme();
 380
 381         }
 382 }
 383
 384 function dfrn_poll_content(&$a) {
 385
 386         $dfrn_id         = ((x($_GET,'dfrn_id'))         ? $_GET['dfrn_id']              : '');
 387         $type            = ((x($_GET,'type'))            ? $_GET['type']                 : 'data');
 388         $last_update     = ((x($_GET,'last_update'))     ? $_GET['last_update']          : '');
 389         $destination_url = ((x($_GET,'destination_url')) ? $_GET['destination_url']      : '');
 390         $sec             = ((x($_GET,'sec'))             ? $_GET['sec']                  : '');
 391         $dfrn_version    = ((x($_GET,'dfrn_version'))    ? (float) $_GET['dfrn_version'] : 2.0);
 392         $perm            = ((x($_GET,'perm'))            ? $_GET['perm']                 : 'r');
 393         $quiet           = ((x($_GET,'quiet'))           ? true                          : false);
 394
 395         $direction = (-1);
 396         if(strpos($dfrn_id,':') == 1) {
 397                 $direction = intval(substr($dfrn_id,0,1));
 398                 $dfrn_id = substr($dfrn_id,2);
 399         }
 400
 401
 402         if($dfrn_id != '') {
 403                 // initial communication from external contact
 404                 $hash = random_string();
 405
 406                 $status = 0;
 407
 408                 $r = q("DELETE FROM `challenge` WHERE `expire` < " . intval(time()));
 409
 410                 if($type !== 'profile') {
 411                         $r = q("INSERT INTO `challenge` ( `challenge`, `dfrn-id`, `expire` , `type`, `last_update` )
 412                                 VALUES( '%s', '%s', '%s', '%s', '%s' ) ",
 413                                 dbesc($hash),
 414                                 dbesc($dfrn_id),
 415                                 intval(time() + 60 ),
 416                                 dbesc($type),
 417                                 dbesc($last_update)
 418                         );
 419                 }
 420                 $sql_extra = '';
 421                 switch($direction) {
 422                         case (-1):
 423                                 if($type === 'profile')
 424                                         $sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", dbesc($dfrn_id),dbesc($dfrn_id));
 425                                 else
 426                                         $sql_extra = sprintf(" AND `issued-id` = '%s' ", dbesc($dfrn_id));
 427                                 $my_id = $dfrn_id;
 428                                 break;
 429                         case 0:
 430                                 $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 431                                 $my_id = '1:' . $dfrn_id;
 432                                 break;
 433                         case 1:
 434                                 $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 435                                 $my_id = '0:' . $dfrn_id;
 436                                 break;
 437                         default:
 438                                 goaway(z_root());
 439                                 break; // NOTREACHED
 440                 }
 441
 442                 $nickname = $a->argv[1];
 443
 444                 $r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname`
 445                         FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
 446                         WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
 447                         AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
 448                         dbesc($nickname)
 449                 );
 450
 451                 if (dbm::is_result($r)) {
 452
 453                         $challenge = '';
 454                         $encrypted_id = '';
 455                         $id_str = $my_id . '.' . mt_rand(1000,9999);
 456
 457                         if(($r[0]['duplex'] && strlen($r[0]['pubkey'])) || (! strlen($r[0]['prvkey']))) {
 458                                 openssl_public_encrypt($hash,$challenge,$r[0]['pubkey']);
 459                                 openssl_public_encrypt($id_str,$encrypted_id,$r[0]['pubkey']);
 460                         }
 461                         else {
 462                                 openssl_private_encrypt($hash,$challenge,$r[0]['prvkey']);
 463                                 openssl_private_encrypt($id_str,$encrypted_id,$r[0]['prvkey']);
 464                         }
 465
 466                         $challenge = bin2hex($challenge);
 467                         $encrypted_id = bin2hex($encrypted_id);
 468                 }
 469                 else {
 470                         $status = 1;
 471                         $challenge = '';
 472                         $encrypted_id = '';
 473                 }
 474
 475                 if(($type === 'profile') && (strlen($sec))) {
 476
 477                         // URL reply
 478
 479                         if($dfrn_version < 2.2) {
 480                                 $s = fetch_url($r[0]['poll']
 481                                         . '?dfrn_id=' . $encrypted_id
 482                                         . '&type=profile-check'
 483                                         . '&dfrn_version=' . DFRN_PROTOCOL_VERSION
 484                                         . '&challenge=' . $challenge
 485                                         . '&sec=' . $sec
 486                                 );
 487                         }
 488                         else {
 489                                 $s = post_url($r[0]['poll'], array(
 490                                         'dfrn_id' => $encrypted_id,
 491                                         'type' => 'profile-check',
 492                                         'dfrn_version' => DFRN_PROTOCOL_VERSION,
 493                                         'challenge' => $challenge,
 494                                         'sec' => $sec
 495                                 ));
 496                         }
 497
 498                         $profile = ((dbm::is_result($r) && $r[0]['nickname']) ? $r[0]['nickname'] : $nickname);
 499
 500                         switch($destination_url) {
 501                                 case 'profile':
 502                                         $dest = $a->get_baseurl() . '/profile/' . $profile . '?f=&tab=profile';
 503                                         break;
 504                                 case 'photos':
 505                                         $dest = $a->get_baseurl() . '/photos/' . $profile;
 506                                         break;
 507                                 case 'status':
 508                                 case '':
 509                                         $dest = $a->get_baseurl() . '/profile/' . $profile;
 510                                         break;
 511                                 default:
 512                                         $dest = $destination_url . '?f=&redir=1';
 513                                         break;
 514                         }
 515
 516                         logger("dfrn_poll: sec profile: " . $s, LOGGER_DATA);
 517
 518                         if(strlen($s) && strstr($s,'<?xml')) {
 519
 520                                 $xml = parse_xml_string($s);
 521
 522                                 logger('dfrn_poll: profile: parsed xml: ' . print_r($xml,true), LOGGER_DATA);
 523
 524                                 logger('dfrn_poll: secure profile: challenge: ' . $xml->challenge . ' expecting ' . $hash);
 525                                 logger('dfrn_poll: secure profile: sec: ' . $xml->sec . ' expecting ' . $sec);
 526
 527
 528                                 if(((int) $xml->status == 0) && ($xml->challenge == $hash)  && ($xml->sec == $sec)) {
 529                                         $_SESSION['authenticated'] = 1;
 530                                         if(! x($_SESSION,'remote'))
 531                                                 $_SESSION['remote'] = array();
 532                                         $_SESSION['remote'][] = array('cid' => $r[0]['id'],'uid' => $r[0]['uid'],'url' => $r[0]['url']);
 533                                         $_SESSION['visitor_id'] = $r[0]['id'];
 534                                         $_SESSION['visitor_home'] = $r[0]['url'];
 535                                         $_SESSION['visitor_visiting'] = $r[0]['uid'];
 536                                         if(!$quiet)
 537                                                 info( sprintf(t('%1$s welcomes %2$s'), $r[0]['username'] , $r[0]['name']) . EOL);
 538                                         // Visitors get 1 day session.
 539                                         $session_id = session_id();
 540                                         $expire = time() + 86400;
 541                                         q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s'",
 542                                                 dbesc($expire),
 543                                                 dbesc($session_id)
 544                                         );
 545                                 }
 546
 547                                 goaway($dest);
 548                         }
 549                         goaway($dest);
 550                         // NOTREACHED
 551
 552                 }
 553                 else {
 554                         // XML reply
 555                         header("Content-type: text/xml");
 556                         echo '<?xml version="1.0" encoding="UTF-8"?>' . "\r\n"
 557                                 . '<dfrn_poll>' . "\r\n"
 558                                 . "\t" . '<status>' . $status . '</status>' . "\r\n"
 559                                 . "\t" . '<dfrn_version>' . DFRN_PROTOCOL_VERSION . '</dfrn_version>' . "\r\n"
 560                                 . "\t" . '<dfrn_id>' . $encrypted_id . '</dfrn_id>' . "\r\n"
 561                                 . "\t" . '<challenge>' . $challenge . '</challenge>' . "\r\n"
 562                                 . '</dfrn_poll>' . "\r\n" ;
 563                         killme();
 564                         // NOTREACHED
 565                 }
 566         }
 567 }