includes/Block.php

   1 <?php
   2 /**
   3  * Blocks and bans object
   4  * @package MediaWiki
   5  */
   6
   7 /**
   8  * The block class
   9  * All the functions in this class assume the object is either explicitly
  10  * loaded or filled. It is not load-on-demand. There are no accessors.
  11  *
  12  * Globals used: $wgAutoblockExpiry, $wgAntiLockFlags
  13  *
  14  * @todo This could be used everywhere, but it isn't.
  15  * @package MediaWiki
  16  */
  17 class Block
  18 {
  19         /* public*/ var $mAddress, $mUser, $mBy, $mReason, $mTimestamp, $mAuto, $mId, $mExpiry,
  20                             $mRangeStart, $mRangeEnd, $mAnonOnly, $mEnableAutoblock;
  21         /* private */ var $mNetworkBits, $mIntegerAddr, $mForUpdate, $mFromMaster, $mByName;
  22
  23         const EB_KEEP_EXPIRED = 1;
  24         const EB_FOR_UPDATE = 2;
  25         const EB_RANGE_ONLY = 4;
  26
  27         function Block( $address = '', $user = 0, $by = 0, $reason = '',
  28                 $timestamp = '' , $auto = 0, $expiry = '', $anonOnly = 0, $createAccount = 0, $enableAutoblock = 0 )
  29         {
  30                 $this->mId = 0;
  31                 $this->mAddress = $address;
  32                 $this->mUser = $user;
  33                 $this->mBy = $by;
  34                 $this->mReason = $reason;
  35                 $this->mTimestamp = wfTimestamp(TS_MW,$timestamp);
  36                 $this->mAuto = $auto;
  37                 $this->mAnonOnly = $anonOnly;
  38                 $this->mCreateAccount = $createAccount;
  39                 $this->mExpiry = self::decodeExpiry( $expiry );
  40                 $this->mEnableAutoblock = $enableAutoblock;
  41
  42                 $this->mForUpdate = false;
  43                 $this->mFromMaster = false;
  44                 $this->mByName = false;
  45                 $this->initialiseRange();
  46         }
  47
  48         static function newFromDB( $address, $user = 0, $killExpired = true )
  49         {
  50                 $block = new Block();
  51                 $block->load( $address, $user, $killExpired );
  52                 if ( $block->isValid() ) {
  53                         return $block;
  54                 } else {
  55                         return null;
  56                 }
  57         }
  58
  59         static function newFromID( $id )
  60         {
  61                 $dbr =& wfGetDB( DB_SLAVE );
  62                 $res = $dbr->resultObject( $dbr->select( 'ipblocks', '*',
  63                         array( 'ipb_id' => $id ), __METHOD__ ) );
  64                 $block = new Block;
  65                 if ( $block->loadFromResult( $res ) ) {
  66                         return $block;
  67                 } else {
  68                         return null;
  69                 }
  70         }
  71
  72         function clear()
  73         {
  74                 $this->mAddress = $this->mReason = $this->mTimestamp = '';
  75                 $this->mId = $this->mAnonOnly = $this->mCreateAccount =
  76                         $this->mEnableAutoblock = $this->mAuto = $this->mUser =
  77                         $this->mBy = 0;
  78                 $this->mByName = false;
  79         }
  80
  81         /**
  82          * Get the DB object and set the reference parameter to the query options
  83          */
  84         function &getDBOptions( &$options )
  85         {
  86                 global $wgAntiLockFlags;
  87                 if ( $this->mForUpdate || $this->mFromMaster ) {
  88                         $db =& wfGetDB( DB_MASTER );
  89                         if ( !$this->mForUpdate || ($wgAntiLockFlags & ALF_NO_BLOCK_LOCK) ) {
  90                                 $options = array();
  91                         } else {
  92                                 $options = array( 'FOR UPDATE' );
  93                         }
  94                 } else {
  95                         $db =& wfGetDB( DB_SLAVE );
  96                         $options = array();
  97                 }
  98                 return $db;
  99         }
 100
 101         /**
 102          * Get a ban from the DB, with either the given address or the given username
 103          *
 104          * @param string $address The IP address of the user, or blank to skip IP blocks
 105          * @param integer $user The user ID, or zero for anonymous users
 106          * @param bool $killExpired Whether to delete expired rows while loading
 107          *
 108          */
 109         function load( $address = '', $user = 0, $killExpired = true )
 110         {
 111                 wfDebug( "Block::load: '$address', '$user', $killExpired\n" );
 112
 113                 $options = array();
 114                 $db =& $this->getDBOptions( $options );
 115
 116                 if ( 0 == $user && $address == '' ) {
 117                         # Invalid user specification, not blocked
 118                         $this->clear();
 119                         return false;
 120                 }
 121
 122                 # Try user block
 123                 if ( $user ) {
 124                         $res = $db->resultObject( $db->select( 'ipblocks', '*', array( 'ipb_user' => $user ),
 125                                 __METHOD__, $options ) );
 126                         if ( $this->loadFromResult( $res, $killExpired ) ) {
 127                                 return true;
 128                         }
 129                 }
 130
 131                 # Try IP block
 132                 # TODO: improve performance by merging this query with the autoblock one
 133                 # Slightly tricky while handling killExpired as well
 134                 if ( $address ) {
 135                         $conds = array( 'ipb_address' => $address, 'ipb_auto' => 0 );
 136                         $res = $db->resultObject( $db->select( 'ipblocks', '*', $conds, __METHOD__, $options ) );
 137                         if ( $this->loadFromResult( $res, $killExpired ) ) {
 138                                 if ( $user && $this->mAnonOnly ) {
 139                                         # Block is marked anon-only
 140                                         # Whitelist this IP address against autoblocks and range blocks
 141                                         $this->clear();
 142                                         return false;
 143                                 } else {
 144                                         return true;
 145                                 }
 146                         }
 147                 }
 148
 149                 # Try range block
 150                 if ( $this->loadRange( $address, $killExpired, $user == 0 ) ) {
 151                         if ( $user && $this->mAnonOnly ) {
 152                                 $this->clear();
 153                                 return false;
 154                         } else {
 155                                 return true;
 156                         }
 157                 }
 158
 159                 # Try autoblock
 160                 if ( $address ) {
 161                         $conds = array( 'ipb_address' => $address, 'ipb_auto' => 1 );
 162                         if ( $user ) {
 163                                 $conds['ipb_anon_only'] = 0;
 164                         }
 165                         $res = $db->resultObject( $db->select( 'ipblocks', '*', $conds, __METHOD__, $options ) );
 166                         if ( $this->loadFromResult( $res, $killExpired ) ) {
 167                                 return true;
 168                         }
 169                 }
 170
 171                 # Give up
 172                 $this->clear();
 173                 return false;
 174         }
 175
 176         /**
 177          * Fill in member variables from a result wrapper
 178          */
 179         function loadFromResult( ResultWrapper $res, $killExpired = true ) {
 180                 $ret = false;
 181                 if ( 0 != $res->numRows() ) {
 182                         # Get first block
 183                         $row = $res->fetchObject();
 184                         $this->initFromRow( $row );
 185
 186                         if ( $killExpired ) {
 187                                 # If requested, delete expired rows
 188                                 do {
 189                                         $killed = $this->deleteIfExpired();
 190                                         if ( $killed ) {
 191                                                 $row = $res->fetchObject();
 192                                                 if ( $row ) {
 193                                                         $this->initFromRow( $row );
 194                                                 }
 195                                         }
 196                                 } while ( $killed && $row );
 197
 198                                 # If there were any left after the killing finished, return true
 199                                 if ( $row ) {
 200                                         $ret = true;
 201                                 }
 202                         } else {
 203                                 $ret = true;
 204                         }
 205                 }
 206                 $res->free();
 207                 return $ret;
 208         }
 209
 210         /**
 211          * Search the database for any range blocks matching the given address, and
 212          * load the row if one is found.
 213          */
 214         function loadRange( $address, $killExpired = true )
 215         {
 216                 $iaddr = IP::toHex( $address );
 217                 if ( $iaddr === false ) {
 218                         # Invalid address
 219                         return false;
 220                 }
 221
 222                 # Only scan ranges which start in this /16, this improves search speed
 223                 # Blocks should not cross a /16 boundary.
 224                 $range = substr( $iaddr, 0, 4 );
 225
 226                 $options = array();
 227                 $db =& $this->getDBOptions( $options );
 228                 $conds = array(
 229                         "ipb_range_start LIKE '$range%'",
 230                         "ipb_range_start <= '$iaddr'",
 231                         "ipb_range_end >= '$iaddr'"
 232                 );
 233
 234                 $res = $db->resultObject( $db->select( 'ipblocks', '*', $conds, __METHOD__, $options ) );
 235                 $success = $this->loadFromResult( $res, $killExpired );
 236                 return $success;
 237         }
 238
 239         /**
 240          * Determine if a given integer IPv4 address is in a given CIDR network
 241          * @deprecated Use IP::isInRange
 242          */
 243         function isAddressInRange( $addr, $range ) {
 244                 return IP::isInRange( $addr, $range );
 245         }
 246
 247         function initFromRow( $row )
 248         {
 249                 $this->mAddress = $row->ipb_address;
 250                 $this->mReason = $row->ipb_reason;
 251                 $this->mTimestamp = wfTimestamp(TS_MW,$row->ipb_timestamp);
 252                 $this->mUser = $row->ipb_user;
 253                 $this->mBy = $row->ipb_by;
 254                 $this->mAuto = $row->ipb_auto;
 255                 $this->mAnonOnly = $row->ipb_anon_only;
 256                 $this->mCreateAccount = $row->ipb_create_account;
 257                 $this->mEnableAutoblock = $row->ipb_enable_autoblock;
 258                 $this->mId = $row->ipb_id;
 259                 $this->mExpiry = self::decodeExpiry( $row->ipb_expiry );
 260                 if ( isset( $row->user_name ) ) {
 261                         $this->mByName = $row->user_name;
 262                 } else {
 263                         $this->mByName = false;
 264                 }
 265                 $this->mRangeStart = $row->ipb_range_start;
 266                 $this->mRangeEnd = $row->ipb_range_end;
 267         }
 268
 269         function initialiseRange()
 270         {
 271                 $this->mRangeStart = '';
 272                 $this->mRangeEnd = '';
 273
 274                 if ( $this->mUser == 0 ) {
 275                         list( $this->mRangeStart, $this->mRangeEnd ) = IP::parseRange( $this->mAddress );
 276                 }
 277         }
 278
 279         /**
 280          * Callback with a Block object for every block
 281          * @return integer number of blocks;
 282          */
 283         /*static*/ function enumBlocks( $callback, $tag, $flags = 0 )
 284         {
 285                 global $wgAntiLockFlags;
 286
 287                 $block = new Block();
 288                 if ( $flags & Block::EB_FOR_UPDATE ) {
 289                         $db =& wfGetDB( DB_MASTER );
 290                         if ( $wgAntiLockFlags & ALF_NO_BLOCK_LOCK ) {
 291                                 $options = '';
 292                         } else {
 293                                 $options = 'FOR UPDATE';
 294                         }
 295                         $block->forUpdate( true );
 296                 } else {
 297                         $db =& wfGetDB( DB_SLAVE );
 298                         $options = '';
 299                 }
 300                 if ( $flags & Block::EB_RANGE_ONLY ) {
 301                         $cond = " AND ipb_range_start <> ''";
 302                 } else {
 303                         $cond = '';
 304                 }
 305
 306                 $now = wfTimestampNow();
 307
 308                 list( $ipblocks, $user ) = $db->tableNamesN( 'ipblocks', 'user' );
 309
 310                 $sql = "SELECT $ipblocks.*,user_name FROM $ipblocks,$user " .
 311                         "WHERE user_id=ipb_by $cond ORDER BY ipb_timestamp DESC $options";
 312                 $res = $db->query( $sql, 'Block::enumBlocks' );
 313                 $num_rows = $db->numRows( $res );
 314
 315                 while ( $row = $db->fetchObject( $res ) ) {
 316                         $block->initFromRow( $row );
 317                         if ( ( $flags & Block::EB_RANGE_ONLY ) && $block->mRangeStart == '' ) {
 318                                 continue;
 319                         }
 320
 321                         if ( !( $flags & Block::EB_KEEP_EXPIRED ) ) {
 322                                 if ( $block->mExpiry && $now > $block->mExpiry ) {
 323                                         $block->delete();
 324                                 } else {
 325                                         call_user_func( $callback, $block, $tag );
 326                                 }
 327                         } else {
 328                                 call_user_func( $callback, $block, $tag );
 329                         }
 330                 }
 331                 $db->freeResult( $res );
 332                 return $num_rows;
 333         }
 334
 335         function delete()
 336         {
 337                 if (wfReadOnly()) {
 338                         return false;
 339                 }
 340                 if ( !$this->mId ) {
 341                         throw new MWException( "Block::delete() now requires that the mId member be filled\n" );
 342                 }
 343
 344                 $dbw =& wfGetDB( DB_MASTER );
 345                 $dbw->delete( 'ipblocks', array( 'ipb_id' => $this->mId ), __METHOD__ );
 346                 return $dbw->affectedRows() > 0;
 347         }
 348
 349         /**
 350         * Insert a block into the block table.
 351         *@return Whether or not the insertion was successful.
 352         */
 353         function insert()
 354         {
 355                 wfDebug( "Block::insert; timestamp {$this->mTimestamp}\n" );
 356                 $dbw =& wfGetDB( DB_MASTER );
 357                 $dbw->begin();
 358
 359                 # Unset ipb_anon_only for user blocks, makes no sense
 360                 if ( $this->mUser ) {
 361                         $this->mAnonOnly = 0;
 362                 }
 363
 364                 # Unset ipb_enable_autoblock for IP blocks, makes no sense
 365                 if ( !$this->mUser ) {
 366                         $this->mEnableAutoblock = 0;
 367                 }
 368
 369                 # Don't collide with expired blocks
 370                 Block::purgeExpired();
 371
 372                 $ipb_id = $dbw->nextSequenceValue('ipblocks_ipb_id_val');
 373                 $dbw->insert( 'ipblocks',
 374                         array(
 375                                 'ipb_id' => $ipb_id,
 376                                 'ipb_address' => $this->mAddress,
 377                                 'ipb_user' => $this->mUser,
 378                                 'ipb_by' => $this->mBy,
 379                                 'ipb_reason' => $this->mReason,
 380                                 'ipb_timestamp' => $dbw->timestamp($this->mTimestamp),
 381                                 'ipb_auto' => $this->mAuto,
 382                                 'ipb_anon_only' => $this->mAnonOnly,
 383                                 'ipb_create_account' => $this->mCreateAccount,
 384                                 'ipb_enable_autoblock' => $this->mEnableAutoblock,
 385                                 'ipb_expiry' => self::encodeExpiry( $this->mExpiry, $dbw ),
 386                                 'ipb_range_start' => $this->mRangeStart,
 387                                 'ipb_range_end' => $this->mRangeEnd,
 388                         ), 'Block::insert', array( 'IGNORE' )
 389                 );
 390                 $affected = $dbw->affectedRows();
 391                 $dbw->commit();
 392
 393                 if ($affected)
 394                         $this->doRetroactiveAutoblock();
 395
 396                 return $affected;
 397         }
 398
 399         /**
 400         * Retroactively autoblocks the last IP used by the user (if it is a user)
 401         * blocked by this Block.
 402         *@return Whether or not a retroactive autoblock was made.
 403         */
 404         function doRetroactiveAutoblock() {
 405                 $dbr = wfGetDB( DB_SLAVE );
 406                 #If autoblock is enabled, autoblock the LAST IP used
 407                 # - stolen shamelessly from CheckUser_body.php
 408
 409                 if ($this->mEnableAutoblock && $this->mUser) {
 410                         wfDebug("Doing retroactive autoblocks for " . $this->mAddress . "\n");
 411
 412                         $row = $dbr->selectRow( 'recentchanges', array( 'rc_ip' ), array( 'rc_user_text' => $this->mAddress ),
 413                                 __METHOD__ , array( 'ORDER BY' => 'rc_timestamp DESC' ) );
 414
 415                         if ( !$row || !$row->rc_ip ) {
 416                                 #No results, don't autoblock anything
 417                                 wfDebug("No IP found to retroactively autoblock\n");
 418                         } else {
 419                                 #Limit is 1, so no loop needed.
 420                                 $retroblockip = $row->rc_ip;
 421                                 return $this->doAutoblock($retroblockip);
 422                         }
 423                 }
 424         }
 425
 426         /**
 427         * Autoblocks the given IP, referring to this Block.
 428         * @param $autoblockip The IP to autoblock.
 429         * @return bool Whether or not an autoblock was inserted.
 430         */
 431         function doAutoblock( $autoblockip ) {
 432                 # Check if this IP address is already blocked
 433                 $dbw =& wfGetDB( DB_MASTER );
 434                 $dbw->begin();
 435
 436                 # If autoblocks are disabled, go away.
 437                 if ( !$this->mEnableAutoblock ) {
 438                         return;
 439                 }
 440
 441                 # Check for presence on the autoblock whitelist
 442                 # TODO cache this?
 443                 $lines = explode( "\n", wfMsgForContentNoTrans( 'autoblock_whitelist' ) );
 444
 445                 $ip = $autoblockip;
 446
 447                 wfDebug("Checking the autoblock whitelist..\n");
 448
 449                 foreach( $lines as $line ) {
 450                         # List items only
 451                         if ( substr( $line, 0, 1 ) !== '*' ) {
 452                                 continue;
 453                         }
 454
 455                         $wlEntry = substr($line, 1);
 456                         $wlEntry = trim($wlEntry);
 457
 458                         wfDebug("Checking $ip against $wlEntry...");
 459
 460                         # Is the IP in this range?
 461                         if (IP::isInRange( $ip, $wlEntry )) {
 462                                 wfDebug(" IP $ip matches $wlEntry, not autoblocking\n");
 463                                 #$autoblockip = null; # Don't autoblock a whitelisted IP.
 464                                 return; #This /SHOULD/ introduce a dummy block - but
 465                                         # I don't know a safe way to do so. -werdna
 466                         } else {
 467                                 wfDebug( " No match\n" );
 468                         }
 469                 }
 470
 471                 # It's okay to autoblock. Go ahead and create/insert the block.
 472
 473                 $ipblock = Block::newFromDB( $autoblockip );
 474                 if ( $ipblock ) {
 475                         # If the user is already blocked. Then check if the autoblock would
 476                         # exceed the user block. If it would exceed, then do nothing, else
 477                         # prolong block time
 478                         if ($this->mExpiry &&
 479                         ($this->mExpiry < Block::getAutoblockExpiry($ipblock->mTimestamp))) {
 480                                 return;
 481                         }
 482                         # Just update the timestamp
 483                         $ipblock->updateTimestamp();
 484                         return;
 485                 } else {
 486                         $ipblock = new Block;
 487                 }
 488
 489                 # Make a new block object with the desired properties
 490                 wfDebug( "Autoblocking {$this->mAddress}@" . $autoblockip . "\n" );
 491                 $ipblock->mAddress = $autoblockip;
 492                 $ipblock->mUser = 0;
 493                 $ipblock->mBy = $this->mBy;
 494                 $ipblock->mReason = wfMsgForContent( 'autoblocker', $this->mAddress, $this->mReason );
 495                 $ipblock->mTimestamp = wfTimestampNow();
 496                 $ipblock->mAuto = 1;
 497                 $ipblock->mCreateAccount = $this->mCreateAccount;
 498
 499                 # If the user is already blocked with an expiry date, we don't
 500                 # want to pile on top of that!
 501                 if($this->mExpiry) {
 502                         $ipblock->mExpiry = min ( $this->mExpiry, Block::getAutoblockExpiry( $this->mTimestamp ));
 503                 } else {
 504                         $ipblock->mExpiry = Block::getAutoblockExpiry( $this->mTimestamp );
 505                 }
 506                 # Insert it
 507                 return $ipblock->insert();
 508         }
 509
 510         function deleteIfExpired()
 511         {
 512                 $fname = 'Block::deleteIfExpired';
 513                 wfProfileIn( $fname );
 514                 if ( $this->isExpired() ) {
 515                         wfDebug( "Block::deleteIfExpired() -- deleting\n" );
 516                         $this->delete();
 517                         $retVal = true;
 518                 } else {
 519                         wfDebug( "Block::deleteIfExpired() -- not expired\n" );
 520                         $retVal = false;
 521                 }
 522                 wfProfileOut( $fname );
 523                 return $retVal;
 524         }
 525
 526         function isExpired()
 527         {
 528                 wfDebug( "Block::isExpired() checking current " . wfTimestampNow() . " vs $this->mExpiry\n" );
 529                 if ( !$this->mExpiry ) {
 530                         return false;
 531                 } else {
 532                         return wfTimestampNow() > $this->mExpiry;
 533                 }
 534         }
 535
 536         function isValid()
 537         {
 538                 return $this->mAddress != '';
 539         }
 540
 541         function updateTimestamp()
 542         {
 543                 if ( $this->mAuto ) {
 544                         $this->mTimestamp = wfTimestamp();
 545                         $this->mExpiry = Block::getAutoblockExpiry( $this->mTimestamp );
 546
 547                         $dbw =& wfGetDB( DB_MASTER );
 548                         $dbw->update( 'ipblocks',
 549                                 array( /* SET */
 550                                         'ipb_timestamp' => $dbw->timestamp($this->mTimestamp),
 551                                         'ipb_expiry' => $dbw->timestamp($this->mExpiry),
 552                                 ), array( /* WHERE */
 553                                         'ipb_address' => $this->mAddress
 554                                 ), 'Block::updateTimestamp'
 555                         );
 556                 }
 557         }
 558
 559         /*
 560         function getIntegerAddr()
 561         {
 562                 return $this->mIntegerAddr;
 563         }
 564
 565         function getNetworkBits()
 566         {
 567                 return $this->mNetworkBits;
 568         }*/
 569
 570         /**
 571          * @return The blocker user ID.
 572          */
 573         public function getBy() {
 574                 return $this->mBy;
 575         }
 576
 577         /**
 578          * @return The blocker user name.
 579          */
 580         function getByName()
 581         {
 582                 if ( $this->mByName === false ) {
 583                         $this->mByName = User::whoIs( $this->mBy );
 584                 }
 585                 return $this->mByName;
 586         }
 587
 588         function forUpdate( $x = NULL ) {
 589                 return wfSetVar( $this->mForUpdate, $x );
 590         }
 591
 592         function fromMaster( $x = NULL ) {
 593                 return wfSetVar( $this->mFromMaster, $x );
 594         }
 595
 596         function getRedactedName() {
 597                 if ( $this->mAuto ) {
 598                         return '#' . $this->mId;
 599                 } else {
 600                         return $this->mAddress;
 601                 }
 602         }
 603
 604         /**
 605          * Encode expiry for DB
 606          */
 607         static function encodeExpiry( $expiry, $db ) {
 608                 if ( $expiry == '' || $expiry == Block::infinity() ) {
 609                         return Block::infinity();
 610                 } else {
 611                         return $db->timestamp( $expiry );
 612                 }
 613         }
 614
 615         /**
 616          * Decode expiry which has come from the DB
 617          */
 618         static function decodeExpiry( $expiry ) {
 619                 if ( $expiry == '' || $expiry == Block::infinity() ) {
 620                         return Block::infinity();
 621                 } else {
 622                         return wfTimestamp( TS_MW, $expiry );
 623                 }
 624         }
 625
 626         static function getAutoblockExpiry( $timestamp )
 627         {
 628                 global $wgAutoblockExpiry;
 629                 return wfTimestamp( TS_MW, wfTimestamp( TS_UNIX, $timestamp ) + $wgAutoblockExpiry );
 630         }
 631
 632         static function normaliseRange( $range )
 633         {
 634                 $parts = explode( '/', $range );
 635                 if ( count( $parts ) == 2 ) {
 636                         $shift = 32 - $parts[1];
 637                         $ipint = IP::toUnsigned( $parts[0] );
 638                         $ipint = $ipint >> $shift << $shift;
 639                         $newip = long2ip( $ipint );
 640                         $range = "$newip/{$parts[1]}";
 641                 }
 642                 return $range;
 643         }
 644
 645         /**
 646          * Purge expired blocks from the ipblocks table
 647          */
 648         static function purgeExpired() {
 649                 $dbw =& wfGetDB( DB_MASTER );
 650                 $dbw->delete( 'ipblocks', array( 'ipb_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ), __METHOD__ );
 651         }
 652
 653         static function infinity() {
 654                 # This is a special keyword for timestamps in PostgreSQL, and
 655                 # works with CHAR(14) as well because "i" sorts after all numbers.
 656                 return 'infinity';
 657
 658                 /*
 659                 static $infinity;
 660                 if ( !isset( $infinity ) ) {
 661                         $dbr =& wfGetDB( DB_SLAVE );
 662                         $infinity = $dbr->bigTimestamp();
 663                 }
 664                 return $infinity;
 665                  */
 666         }
 667
 668 }
 669 ?>