includes/Block.php

   1 <?php
   2 /**
   3  * Blocks and bans object
   4  */
   5
   6 /**
   7  * The block class
   8  * All the functions in this class assume the object is either explicitly
   9  * loaded or filled. It is not load-on-demand. There are no accessors.
  10  *
  11  * Globals used: $wgAutoblockExpiry, $wgAntiLockFlags
  12  *
  13  * @todo This could be used everywhere, but it isn't.
  14  */
  15 class Block
  16 {
  17         /* public*/ var $mAddress, $mUser, $mBy, $mReason, $mTimestamp, $mAuto, $mId, $mExpiry,
  18                             $mRangeStart, $mRangeEnd, $mAnonOnly, $mEnableAutoblock;
  19         /* private */ var $mNetworkBits, $mIntegerAddr, $mForUpdate, $mFromMaster, $mByName;
  20
  21         const EB_KEEP_EXPIRED = 1;
  22         const EB_FOR_UPDATE = 2;
  23         const EB_RANGE_ONLY = 4;
  24
  25         function __construct( $address = '', $user = 0, $by = 0, $reason = '',
  26                 $timestamp = '' , $auto = 0, $expiry = '', $anonOnly = 0, $createAccount = 0, $enableAutoblock = 0 )
  27         {
  28                 $this->mId = 0;
  29                 # Expand valid IPv6 addresses
  30                 $address = IP::sanitizeIP( $address );
  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 ) ) {
 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         {
 181                 $ret = false;
 182                 if ( 0 != $res->numRows() ) {
 183                         # Get first block
 184                         $row = $res->fetchObject();
 185                         $this->initFromRow( $row );
 186
 187                         if ( $killExpired ) {
 188                                 # If requested, delete expired rows
 189                                 do {
 190                                         $killed = $this->deleteIfExpired();
 191                                         if ( $killed ) {
 192                                                 $row = $res->fetchObject();
 193                                                 if ( $row ) {
 194                                                         $this->initFromRow( $row );
 195                                                 }
 196                                         }
 197                                 } while ( $killed && $row );
 198
 199                                 # If there were any left after the killing finished, return true
 200                                 if ( $row ) {
 201                                         $ret = true;
 202                                 }
 203                         } else {
 204                                 $ret = true;
 205                         }
 206                 }
 207                 $res->free();
 208                 return $ret;
 209         }
 210
 211         /**
 212          * Search the database for any range blocks matching the given address, and
 213          * load the row if one is found.
 214          */
 215         function loadRange( $address, $killExpired = true, $user = 0 )
 216         {
 217                 $iaddr = IP::toHex( $address );
 218                 if ( $iaddr === false ) {
 219                         # Invalid address
 220                         return false;
 221                 }
 222
 223                 # Only scan ranges which start in this /16, this improves search speed
 224                 # Blocks should not cross a /16 boundary.
 225                 $range = substr( $iaddr, 0, 4 );
 226
 227                 $options = array();
 228                 $db =& $this->getDBOptions( $options );
 229                 $conds = array(
 230                         "ipb_range_start LIKE '$range%'",
 231                         "ipb_range_start <= '$iaddr'",
 232                         "ipb_range_end >= '$iaddr'"
 233                 );
 234
 235                 if ( $user ) {
 236                         $conds['ipb_anon_only'] = 0;
 237                 }
 238
 239                 $res = $db->resultObject( $db->select( 'ipblocks', '*', $conds, __METHOD__, $options ) );
 240                 $success = $this->loadFromResult( $res, $killExpired );
 241                 return $success;
 242         }
 243
 244         /**
 245          * Determine if a given integer IPv4 address is in a given CIDR network
 246          * @deprecated Use IP::isInRange
 247          */
 248         function isAddressInRange( $addr, $range ) {
 249                 return IP::isInRange( $addr, $range );
 250         }
 251
 252         function initFromRow( $row )
 253         {
 254                 $this->mAddress = $row->ipb_address;
 255                 $this->mReason = $row->ipb_reason;
 256                 $this->mTimestamp = wfTimestamp(TS_MW,$row->ipb_timestamp);
 257                 $this->mUser = $row->ipb_user;
 258                 $this->mBy = $row->ipb_by;
 259                 $this->mAuto = $row->ipb_auto;
 260                 $this->mAnonOnly = $row->ipb_anon_only;
 261                 $this->mCreateAccount = $row->ipb_create_account;
 262                 $this->mEnableAutoblock = $row->ipb_enable_autoblock;
 263                 $this->mId = $row->ipb_id;
 264                 $this->mExpiry = self::decodeExpiry( $row->ipb_expiry );
 265                 if ( isset( $row->user_name ) ) {
 266                         $this->mByName = $row->user_name;
 267                 } else {
 268                         $this->mByName = false;
 269                 }
 270                 $this->mRangeStart = $row->ipb_range_start;
 271                 $this->mRangeEnd = $row->ipb_range_end;
 272         }
 273
 274         function initialiseRange()
 275         {
 276                 $this->mRangeStart = '';
 277                 $this->mRangeEnd = '';
 278
 279                 if ( $this->mUser == 0 ) {
 280                         list( $this->mRangeStart, $this->mRangeEnd ) = IP::parseRange( $this->mAddress );
 281                 }
 282         }
 283
 284         /**
 285          * Callback with a Block object for every block
 286          * @return integer number of blocks;
 287          */
 288         /*static*/ function enumBlocks( $callback, $tag, $flags = 0 )
 289         {
 290                 global $wgAntiLockFlags;
 291
 292                 $block = new Block();
 293                 if ( $flags & Block::EB_FOR_UPDATE ) {
 294                         $db = wfGetDB( DB_MASTER );
 295                         if ( $wgAntiLockFlags & ALF_NO_BLOCK_LOCK ) {
 296                                 $options = '';
 297                         } else {
 298                                 $options = 'FOR UPDATE';
 299                         }
 300                         $block->forUpdate( true );
 301                 } else {
 302                         $db = wfGetDB( DB_SLAVE );
 303                         $options = '';
 304                 }
 305                 if ( $flags & Block::EB_RANGE_ONLY ) {
 306                         $cond = " AND ipb_range_start <> ''";
 307                 } else {
 308                         $cond = '';
 309                 }
 310
 311                 $now = wfTimestampNow();
 312
 313                 list( $ipblocks, $user ) = $db->tableNamesN( 'ipblocks', 'user' );
 314
 315                 $sql = "SELECT $ipblocks.*,user_name FROM $ipblocks,$user " .
 316                         "WHERE user_id=ipb_by $cond ORDER BY ipb_timestamp DESC $options";
 317                 $res = $db->query( $sql, 'Block::enumBlocks' );
 318                 $num_rows = $db->numRows( $res );
 319
 320                 while ( $row = $db->fetchObject( $res ) ) {
 321                         $block->initFromRow( $row );
 322                         if ( ( $flags & Block::EB_RANGE_ONLY ) && $block->mRangeStart == '' ) {
 323                                 continue;
 324                         }
 325
 326                         if ( !( $flags & Block::EB_KEEP_EXPIRED ) ) {
 327                                 if ( $block->mExpiry && $now > $block->mExpiry ) {
 328                                         $block->delete();
 329                                 } else {
 330                                         call_user_func( $callback, $block, $tag );
 331                                 }
 332                         } else {
 333                                 call_user_func( $callback, $block, $tag );
 334                         }
 335                 }
 336                 $db->freeResult( $res );
 337                 return $num_rows;
 338         }
 339
 340         function delete()
 341         {
 342                 if (wfReadOnly()) {
 343                         return false;
 344                 }
 345                 if ( !$this->mId ) {
 346                         throw new MWException( "Block::delete() now requires that the mId member be filled\n" );
 347                 }
 348
 349                 $dbw = wfGetDB( DB_MASTER );
 350                 $dbw->delete( 'ipblocks', array( 'ipb_id' => $this->mId ), __METHOD__ );
 351                 return $dbw->affectedRows() > 0;
 352         }
 353
 354         /**
 355         * Insert a block into the block table.
 356         *@return Whether or not the insertion was successful.
 357         */
 358         function insert()
 359         {
 360                 wfDebug( "Block::insert; timestamp {$this->mTimestamp}\n" );
 361                 $dbw = wfGetDB( DB_MASTER );
 362                 $dbw->begin();
 363
 364                 # Unset ipb_anon_only for user blocks, makes no sense
 365                 if ( $this->mUser ) {
 366                         $this->mAnonOnly = 0;
 367                 }
 368
 369                 # Unset ipb_enable_autoblock for IP blocks, makes no sense
 370                 if ( !$this->mUser ) {
 371                         $this->mEnableAutoblock = 0;
 372                 }
 373
 374                 # Don't collide with expired blocks
 375                 Block::purgeExpired();
 376
 377                 $ipb_id = $dbw->nextSequenceValue('ipblocks_ipb_id_val');
 378                 $dbw->insert( 'ipblocks',
 379                         array(
 380                                 'ipb_id' => $ipb_id,
 381                                 'ipb_address' => $this->mAddress,
 382                                 'ipb_user' => $this->mUser,
 383                                 'ipb_by' => $this->mBy,
 384                                 'ipb_reason' => $this->mReason,
 385                                 'ipb_timestamp' => $dbw->timestamp($this->mTimestamp),
 386                                 'ipb_auto' => $this->mAuto,
 387                                 'ipb_anon_only' => $this->mAnonOnly,
 388                                 'ipb_create_account' => $this->mCreateAccount,
 389                                 'ipb_enable_autoblock' => $this->mEnableAutoblock,
 390                                 'ipb_expiry' => self::encodeExpiry( $this->mExpiry, $dbw ),
 391                                 'ipb_range_start' => $this->mRangeStart,
 392                                 'ipb_range_end' => $this->mRangeEnd,
 393                         ), 'Block::insert', array( 'IGNORE' )
 394                 );
 395                 $affected = $dbw->affectedRows();
 396                 $dbw->commit();
 397
 398                 if ($affected)
 399                         $this->doRetroactiveAutoblock();
 400
 401                 return $affected;
 402         }
 403
 404         /**
 405         * Retroactively autoblocks the last IP used by the user (if it is a user)
 406         * blocked by this Block.
 407         *@return Whether or not a retroactive autoblock was made.
 408         */
 409         function doRetroactiveAutoblock() {
 410                 $dbr = wfGetDB( DB_SLAVE );
 411                 #If autoblock is enabled, autoblock the LAST IP used
 412                 # - stolen shamelessly from CheckUser_body.php
 413
 414                 if ($this->mEnableAutoblock && $this->mUser) {
 415                         wfDebug("Doing retroactive autoblocks for " . $this->mAddress . "\n");
 416
 417                         $row = $dbr->selectRow( 'recentchanges', array( 'rc_ip' ), array( 'rc_user_text' => $this->mAddress ),
 418                                 __METHOD__ , array( 'ORDER BY' => 'rc_timestamp DESC' ) );
 419
 420                         if ( !$row || !$row->rc_ip ) {
 421                                 #No results, don't autoblock anything
 422                                 wfDebug("No IP found to retroactively autoblock\n");
 423                         } else {
 424                                 #Limit is 1, so no loop needed.
 425                                 $retroblockip = $row->rc_ip;
 426                                 return $this->doAutoblock($retroblockip);
 427                         }
 428                 }
 429         }
 430
 431         /**
 432         * Autoblocks the given IP, referring to this Block.
 433         * @param $autoblockip The IP to autoblock.
 434         * @return bool Whether or not an autoblock was inserted.
 435         */
 436         function doAutoblock( $autoblockip ) {
 437                 # Check if this IP address is already blocked
 438                 $dbw = wfGetDB( DB_MASTER );
 439                 $dbw->begin();
 440
 441                 # If autoblocks are disabled, go away.
 442                 if ( !$this->mEnableAutoblock ) {
 443                         return;
 444                 }
 445
 446                 # Check for presence on the autoblock whitelist
 447                 # TODO cache this?
 448                 $lines = explode( "\n", wfMsgForContentNoTrans( 'autoblock_whitelist' ) );
 449
 450                 $ip = $autoblockip;
 451
 452                 wfDebug("Checking the autoblock whitelist..\n");
 453
 454                 foreach( $lines as $line ) {
 455                         # List items only
 456                         if ( substr( $line, 0, 1 ) !== '*' ) {
 457                                 continue;
 458                         }
 459
 460                         $wlEntry = substr($line, 1);
 461                         $wlEntry = trim($wlEntry);
 462
 463                         wfDebug("Checking $ip against $wlEntry...");
 464
 465                         # Is the IP in this range?
 466                         if (IP::isInRange( $ip, $wlEntry )) {
 467                                 wfDebug(" IP $ip matches $wlEntry, not autoblocking\n");
 468                                 #$autoblockip = null; # Don't autoblock a whitelisted IP.
 469                                 return; #This /SHOULD/ introduce a dummy block - but
 470                                         # I don't know a safe way to do so. -werdna
 471                         } else {
 472                                 wfDebug( " No match\n" );
 473                         }
 474                 }
 475
 476                 # It's okay to autoblock. Go ahead and create/insert the block.
 477
 478                 $ipblock = Block::newFromDB( $autoblockip );
 479                 if ( $ipblock ) {
 480                         # If the user is already blocked. Then check if the autoblock would
 481                         # exceed the user block. If it would exceed, then do nothing, else
 482                         # prolong block time
 483                         if ($this->mExpiry &&
 484                         ($this->mExpiry < Block::getAutoblockExpiry($ipblock->mTimestamp))) {
 485                                 return;
 486                         }
 487                         # Just update the timestamp
 488                         $ipblock->updateTimestamp();
 489                         return;
 490                 } else {
 491                         $ipblock = new Block;
 492                 }
 493
 494                 # Make a new block object with the desired properties
 495                 wfDebug( "Autoblocking {$this->mAddress}@" . $autoblockip . "\n" );
 496                 $ipblock->mAddress = $autoblockip;
 497                 $ipblock->mUser = 0;
 498                 $ipblock->mBy = $this->mBy;
 499                 $ipblock->mReason = wfMsgForContent( 'autoblocker', $this->mAddress, $this->mReason );
 500                 $ipblock->mTimestamp = wfTimestampNow();
 501                 $ipblock->mAuto = 1;
 502                 $ipblock->mCreateAccount = $this->mCreateAccount;
 503
 504                 # If the user is already blocked with an expiry date, we don't
 505                 # want to pile on top of that!
 506                 if($this->mExpiry) {
 507                         $ipblock->mExpiry = min ( $this->mExpiry, Block::getAutoblockExpiry( $this->mTimestamp ));
 508                 } else {
 509                         $ipblock->mExpiry = Block::getAutoblockExpiry( $this->mTimestamp );
 510                 }
 511                 # Insert it
 512                 return $ipblock->insert();
 513         }
 514
 515         function deleteIfExpired()
 516         {
 517                 $fname = 'Block::deleteIfExpired';
 518                 wfProfileIn( $fname );
 519                 if ( $this->isExpired() ) {
 520                         wfDebug( "Block::deleteIfExpired() -- deleting\n" );
 521                         $this->delete();
 522                         $retVal = true;
 523                 } else {
 524                         wfDebug( "Block::deleteIfExpired() -- not expired\n" );
 525                         $retVal = false;
 526                 }
 527                 wfProfileOut( $fname );
 528                 return $retVal;
 529         }
 530
 531         function isExpired()
 532         {
 533                 wfDebug( "Block::isExpired() checking current " . wfTimestampNow() . " vs $this->mExpiry\n" );
 534                 if ( !$this->mExpiry ) {
 535                         return false;
 536                 } else {
 537                         return wfTimestampNow() > $this->mExpiry;
 538                 }
 539         }
 540
 541         function isValid()
 542         {
 543                 return $this->mAddress != '';
 544         }
 545
 546         function updateTimestamp()
 547         {
 548                 if ( $this->mAuto ) {
 549                         $this->mTimestamp = wfTimestamp();
 550                         $this->mExpiry = Block::getAutoblockExpiry( $this->mTimestamp );
 551
 552                         $dbw = wfGetDB( DB_MASTER );
 553                         $dbw->update( 'ipblocks',
 554                                 array( /* SET */
 555                                         'ipb_timestamp' => $dbw->timestamp($this->mTimestamp),
 556                                         'ipb_expiry' => $dbw->timestamp($this->mExpiry),
 557                                 ), array( /* WHERE */
 558                                         'ipb_address' => $this->mAddress
 559                                 ), 'Block::updateTimestamp'
 560                         );
 561                 }
 562         }
 563
 564         /*
 565         function getIntegerAddr()
 566         {
 567                 return $this->mIntegerAddr;
 568         }
 569
 570         function getNetworkBits()
 571         {
 572                 return $this->mNetworkBits;
 573         }*/
 574
 575         /**
 576          * @return The blocker user ID.
 577          */
 578         public function getBy() {
 579                 return $this->mBy;
 580         }
 581
 582         /**
 583          * @return The blocker user name.
 584          */
 585         function getByName()
 586         {
 587                 if ( $this->mByName === false ) {
 588                         $this->mByName = User::whoIs( $this->mBy );
 589                 }
 590                 return $this->mByName;
 591         }
 592
 593         function forUpdate( $x = NULL ) {
 594                 return wfSetVar( $this->mForUpdate, $x );
 595         }
 596
 597         function fromMaster( $x = NULL ) {
 598                 return wfSetVar( $this->mFromMaster, $x );
 599         }
 600
 601         function getRedactedName() {
 602                 if ( $this->mAuto ) {
 603                         return '#' . $this->mId;
 604                 } else {
 605                         return $this->mAddress;
 606                 }
 607         }
 608
 609         /**
 610          * Encode expiry for DB
 611          */
 612         static function encodeExpiry( $expiry, $db ) {
 613                 if ( $expiry == '' || $expiry == Block::infinity() ) {
 614                         return Block::infinity();
 615                 } else {
 616                         return $db->timestamp( $expiry );
 617                 }
 618         }
 619
 620         /**
 621          * Decode expiry which has come from the DB
 622          */
 623         static function decodeExpiry( $expiry ) {
 624                 if ( $expiry == '' || $expiry == Block::infinity() ) {
 625                         return Block::infinity();
 626                 } else {
 627                         return wfTimestamp( TS_MW, $expiry );
 628                 }
 629         }
 630
 631         static function getAutoblockExpiry( $timestamp )
 632         {
 633                 global $wgAutoblockExpiry;
 634                 return wfTimestamp( TS_MW, wfTimestamp( TS_UNIX, $timestamp ) + $wgAutoblockExpiry );
 635         }
 636
 637         static function normaliseRange( $range )
 638         {
 639                 $parts = explode( '/', $range );
 640                 if ( count( $parts ) == 2 ) {
 641                         $shift = 32 - $parts[1];
 642                         $ipint = IP::toUnsigned( $parts[0] );
 643                         $ipint = $ipint >> $shift << $shift;
 644                         $newip = long2ip( $ipint );
 645                         $range = "$newip/{$parts[1]}";
 646                 }
 647                 return $range;
 648         }
 649
 650         // For IPv6
 651         static function normaliseRange6( $range ) {
 652                 $parts = explode( '/', $range );
 653                 if ( count( $parts ) == 2 ) {
 654                         $bits = $parts[1];
 655                         $ipint = IP::toUnsigned6( $parts[0] );
 656                         # Native 32 bit functions WONT work here!!!
 657                         # Convert to a padded binary number
 658                         $network = wfBaseConvert( $ipint, 10, 2, 128 );
 659                         # Truncate the last (128-$bits) bits and replace them with zeros
 660                         $network = str_pad( substr( $network, 0, $bits ), 128, 0, STR_PAD_RIGHT );
 661                         # Convert back to an integer
 662                         $network = wfBaseConvert( $network, 2, 10 );
 663                         # Reform octet address
 664                         $newip = IP::toOctet( $network );
 665                         $range = "$newip/{$parts[1]}";
 666                 }
 667                 return $range;
 668         }
 669
 670         /**
 671          * Purge expired blocks from the ipblocks table
 672          */
 673         static function purgeExpired() {
 674                 $dbw = wfGetDB( DB_MASTER );
 675                 $dbw->delete( 'ipblocks', array( 'ipb_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ), __METHOD__ );
 676         }
 677
 678         static function infinity() {
 679                 # This is a special keyword for timestamps in PostgreSQL, and
 680                 # works with CHAR(14) as well because "i" sorts after all numbers.
 681                 return 'infinity';
 682
 683                 /*
 684                 static $infinity;
 685                 if ( !isset( $infinity ) ) {
 686                         $dbr = wfGetDB( DB_SLAVE );
 687                         $infinity = $dbr->bigTimestamp();
 688                 }
 689                 return $infinity;
 690                  */
 691         }
 692
 693 }
 694 ?>