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