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, $mHideName;
  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, $hideName = 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                 $this->mHideName = $hideName;
  42
  43                 $this->mForUpdate = false;
  44                 $this->mFromMaster = false;
  45                 $this->mByName = false;
  46                 $this->initialiseRange();
  47         }
  48
  49         static function newFromDB( $address, $user = 0, $killExpired = true )
  50         {
  51                 $block = new Block();
  52                 $block->load( $address, $user, $killExpired );
  53                 if ( $block->isValid() ) {
  54                         return $block;
  55                 } else {
  56                         return null;
  57                 }
  58         }
  59
  60         static function newFromID( $id )
  61         {
  62                 $dbr = wfGetDB( DB_SLAVE );
  63                 $res = $dbr->resultObject( $dbr->select( 'ipblocks', '*',
  64                         array( 'ipb_id' => $id ), __METHOD__ ) );
  65                 $block = new Block;
  66                 if ( $block->loadFromResult( $res ) ) {
  67                         return $block;
  68                 } else {
  69                         return null;
  70                 }
  71         }
  72
  73         function clear()
  74         {
  75                 $this->mAddress = $this->mReason = $this->mTimestamp = '';
  76                 $this->mId = $this->mAnonOnly = $this->mCreateAccount =
  77                         $this->mEnableAutoblock = $this->mAuto = $this->mUser =
  78                         $this->mBy = $this->mHideName = 0;
  79                 $this->mByName = false;
  80         }
  81
  82         /**
  83          * Get the DB object and set the reference parameter to the query options
  84          */
  85         function &getDBOptions( &$options )
  86         {
  87                 global $wgAntiLockFlags;
  88                 if ( $this->mForUpdate || $this->mFromMaster ) {
  89                         $db = wfGetDB( DB_MASTER );
  90                         if ( !$this->mForUpdate || ($wgAntiLockFlags & ALF_NO_BLOCK_LOCK) ) {
  91                                 $options = array();
  92                         } else {
  93                                 $options = array( 'FOR UPDATE' );
  94                         }
  95                 } else {
  96                         $db = wfGetDB( DB_SLAVE );
  97                         $options = array();
  98                 }
  99                 return $db;
 100         }
 101
 102         /**
 103          * Get a ban from the DB, with either the given address or the given username
 104          *
 105          * @param string $address The IP address of the user, or blank to skip IP blocks
 106          * @param integer $user The user ID, or zero for anonymous users
 107          * @param bool $killExpired Whether to delete expired rows while loading
 108          *
 109          */
 110         function load( $address = '', $user = 0, $killExpired = true )
 111         {
 112                 wfDebug( "Block::load: '$address', '$user', $killExpired\n" );
 113
 114                 $options = array();
 115                 $db =& $this->getDBOptions( $options );
 116
 117                 if ( 0 == $user && $address == '' ) {
 118                         # Invalid user specification, not blocked
 119                         $this->clear();
 120                         return false;
 121                 }
 122
 123                 # Try user block
 124                 if ( $user ) {
 125                         $res = $db->resultObject( $db->select( 'ipblocks', '*', array( 'ipb_user' => $user ),
 126                                 __METHOD__, $options ) );
 127                         if ( $this->loadFromResult( $res, $killExpired ) ) {
 128                                 return true;
 129                         }
 130                 }
 131
 132                 # Try IP block
 133                 # TODO: improve performance by merging this query with the autoblock one
 134                 # Slightly tricky while handling killExpired as well
 135                 if ( $address ) {
 136                         $conds = array( 'ipb_address' => $address, 'ipb_auto' => 0 );
 137                         $res = $db->resultObject( $db->select( 'ipblocks', '*', $conds, __METHOD__, $options ) );
 138                         if ( $this->loadFromResult( $res, $killExpired ) ) {
 139                                 if ( $user && $this->mAnonOnly ) {
 140                                         # Block is marked anon-only
 141                                         # Whitelist this IP address against autoblocks and range blocks
 142                                         $this->clear();
 143                                         return false;
 144                                 } else {
 145                                         return true;
 146                                 }
 147                         }
 148                 }
 149
 150                 # Try range block
 151                 if ( $this->loadRange( $address, $killExpired, $user == 0 ) ) {
 152                         if ( $user && $this->mAnonOnly ) {
 153                                 $this->clear();
 154                                 return false;
 155                         } else {
 156                                 return true;
 157                         }
 158                 }
 159
 160                 # Try autoblock
 161                 if ( $address ) {
 162                         $conds = array( 'ipb_address' => $address, 'ipb_auto' => 1 );
 163                         if ( $user ) {
 164                                 $conds['ipb_anon_only'] = 0;
 165                         }
 166                         $res = $db->resultObject( $db->select( 'ipblocks', '*', $conds, __METHOD__, $options ) );
 167                         if ( $this->loadFromResult( $res, $killExpired ) ) {
 168                                 return true;
 169                         }
 170                 }
 171
 172                 # Give up
 173                 $this->clear();
 174                 return false;
 175         }
 176
 177         /**
 178          * Fill in member variables from a result wrapper
 179          */
 180         function loadFromResult( ResultWrapper $res, $killExpired = true )
 181         {
 182                 $ret = false;
 183                 if ( 0 != $res->numRows() ) {
 184                         # Get first block
 185                         $row = $res->fetchObject();
 186                         $this->initFromRow( $row );
 187
 188                         if ( $killExpired ) {
 189                                 # If requested, delete expired rows
 190                                 do {
 191                                         $killed = $this->deleteIfExpired();
 192                                         if ( $killed ) {
 193                                                 $row = $res->fetchObject();
 194                                                 if ( $row ) {
 195                                                         $this->initFromRow( $row );
 196                                                 }
 197                                         }
 198                                 } while ( $killed && $row );
 199
 200                                 # If there were any left after the killing finished, return true
 201                                 if ( $row ) {
 202                                         $ret = true;
 203                                 }
 204                         } else {
 205                                 $ret = true;
 206                         }
 207                 }
 208                 $res->free();
 209                 return $ret;
 210         }
 211
 212         /**
 213          * Search the database for any range blocks matching the given address, and
 214          * load the row if one is found.
 215          */
 216         function loadRange( $address, $killExpired = true, $user = 0 )
 217         {
 218                 $iaddr = IP::toHex( $address );
 219                 if ( $iaddr === false ) {
 220                         # Invalid address
 221                         return false;
 222                 }
 223
 224                 # Only scan ranges which start in this /16, this improves search speed
 225                 # Blocks should not cross a /16 boundary.
 226                 $range = substr( $iaddr, 0, 4 );
 227
 228                 $options = array();
 229                 $db =& $this->getDBOptions( $options );
 230                 $conds = array(
 231                         "ipb_range_start LIKE '$range%'",
 232                         "ipb_range_start <= '$iaddr'",
 233                         "ipb_range_end >= '$iaddr'"
 234                 );
 235
 236                 if ( $user ) {
 237                         $conds['ipb_anon_only'] = 0;
 238                 }
 239
 240                 $res = $db->resultObject( $db->select( 'ipblocks', '*', $conds, __METHOD__, $options ) );
 241                 $success = $this->loadFromResult( $res, $killExpired );
 242                 return $success;
 243         }
 244
 245         /**
 246          * Determine if a given integer IPv4 address is in a given CIDR network
 247          * @deprecated Use IP::isInRange
 248          */
 249         function isAddressInRange( $addr, $range ) {
 250                 return IP::isInRange( $addr, $range );
 251         }
 252
 253         function initFromRow( $row )
 254         {
 255                 $this->mAddress = $row->ipb_address;
 256                 $this->mReason = $row->ipb_reason;
 257                 $this->mTimestamp = wfTimestamp(TS_MW,$row->ipb_timestamp);
 258                 $this->mUser = $row->ipb_user;
 259                 $this->mBy = $row->ipb_by;
 260                 $this->mAuto = $row->ipb_auto;
 261                 $this->mAnonOnly = $row->ipb_anon_only;
 262                 $this->mCreateAccount = $row->ipb_create_account;
 263                 $this->mEnableAutoblock = $row->ipb_enable_autoblock;
 264                 $this->mHideName = $row->ipb_deleted;
 265                 $this->mId = $row->ipb_id;
 266                 $this->mExpiry = self::decodeExpiry( $row->ipb_expiry );
 267                 if ( isset( $row->user_name ) ) {
 268                         $this->mByName = $row->user_name;
 269                 } else {
 270                         $this->mByName = false;
 271                 }
 272                 $this->mRangeStart = $row->ipb_range_start;
 273                 $this->mRangeEnd = $row->ipb_range_end;
 274         }
 275
 276         function initialiseRange()
 277         {
 278                 $this->mRangeStart = '';
 279                 $this->mRangeEnd = '';
 280
 281                 if ( $this->mUser == 0 ) {
 282                         list( $this->mRangeStart, $this->mRangeEnd ) = IP::parseRange( $this->mAddress );
 283                 }
 284         }
 285
 286         /**
 287          * Callback with a Block object for every block
 288          * @return integer number of blocks;
 289          */
 290         /*static*/ function enumBlocks( $callback, $tag, $flags = 0 )
 291         {
 292                 global $wgAntiLockFlags;
 293
 294                 $block = new Block();
 295                 if ( $flags & Block::EB_FOR_UPDATE ) {
 296                         $db = wfGetDB( DB_MASTER );
 297                         if ( $wgAntiLockFlags & ALF_NO_BLOCK_LOCK ) {
 298                                 $options = '';
 299                         } else {
 300                                 $options = 'FOR UPDATE';
 301                         }
 302                         $block->forUpdate( true );
 303                 } else {
 304                         $db = wfGetDB( DB_SLAVE );
 305                         $options = '';
 306                 }
 307                 if ( $flags & Block::EB_RANGE_ONLY ) {
 308                         $cond = " AND ipb_range_start <> ''";
 309                 } else {
 310                         $cond = '';
 311                 }
 312
 313                 $now = wfTimestampNow();
 314
 315                 list( $ipblocks, $user ) = $db->tableNamesN( 'ipblocks', 'user' );
 316
 317                 $sql = "SELECT $ipblocks.*,user_name FROM $ipblocks,$user " .
 318                         "WHERE user_id=ipb_by $cond ORDER BY ipb_timestamp DESC $options";
 319                 $res = $db->query( $sql, 'Block::enumBlocks' );
 320                 $num_rows = $db->numRows( $res );
 321
 322                 while ( $row = $db->fetchObject( $res ) ) {
 323                         $block->initFromRow( $row );
 324                         if ( ( $flags & Block::EB_RANGE_ONLY ) && $block->mRangeStart == '' ) {
 325                                 continue;
 326                         }
 327
 328                         if ( !( $flags & Block::EB_KEEP_EXPIRED ) ) {
 329                                 if ( $block->mExpiry && $now > $block->mExpiry ) {
 330                                         $block->delete();
 331                                 } else {
 332                                         call_user_func( $callback, $block, $tag );
 333                                 }
 334                         } else {
 335                                 call_user_func( $callback, $block, $tag );
 336                         }
 337                 }
 338                 $db->freeResult( $res );
 339                 return $num_rows;
 340         }
 341
 342         function delete()
 343         {
 344                 if (wfReadOnly()) {
 345                         return false;
 346                 }
 347                 if ( !$this->mId ) {
 348                         throw new MWException( "Block::delete() now requires that the mId member be filled\n" );
 349                 }
 350
 351                 $dbw = wfGetDB( DB_MASTER );
 352                 $dbw->delete( 'ipblocks', array( 'ipb_id' => $this->mId ), __METHOD__ );
 353                 return $dbw->affectedRows() > 0;
 354         }
 355
 356         /**
 357         * Insert a block into the block table.
 358         *@return Whether or not the insertion was successful.
 359         */
 360         function insert()
 361         {
 362                 wfDebug( "Block::insert; timestamp {$this->mTimestamp}\n" );
 363                 $dbw = wfGetDB( DB_MASTER );
 364                 $dbw->begin();
 365
 366                 # Unset ipb_anon_only for user blocks, makes no sense
 367                 if ( $this->mUser ) {
 368                         $this->mAnonOnly = 0;
 369                 }
 370
 371                 # Unset ipb_enable_autoblock for IP blocks, makes no sense
 372                 if ( !$this->mUser ) {
 373                         $this->mEnableAutoblock = 0;
 374                 }
 375
 376                 # Don't collide with expired blocks
 377                 Block::purgeExpired();
 378
 379                 $ipb_id = $dbw->nextSequenceValue('ipblocks_ipb_id_val');
 380                 $dbw->insert( 'ipblocks',
 381                         array(
 382                                 'ipb_id' => $ipb_id,
 383                                 'ipb_address' => $this->mAddress,
 384                                 'ipb_user' => $this->mUser,
 385                                 'ipb_by' => $this->mBy,
 386                                 'ipb_reason' => $this->mReason,
 387                                 'ipb_timestamp' => $dbw->timestamp($this->mTimestamp),
 388                                 'ipb_auto' => $this->mAuto,
 389                                 'ipb_anon_only' => $this->mAnonOnly,
 390                                 'ipb_create_account' => $this->mCreateAccount,
 391                                 'ipb_enable_autoblock' => $this->mEnableAutoblock,
 392                                 'ipb_expiry' => self::encodeExpiry( $this->mExpiry, $dbw ),
 393                                 'ipb_range_start' => $this->mRangeStart,
 394                                 'ipb_range_end' => $this->mRangeEnd,
 395                                 'ipb_deleted'   => $this->mHideName
 396                         ), 'Block::insert', array( 'IGNORE' )
 397                 );
 398                 $affected = $dbw->affectedRows();
 399                 $dbw->commit();
 400
 401                 if ($affected)
 402                         $this->doRetroactiveAutoblock();
 403
 404                 return $affected;
 405         }
 406
 407         /**
 408         * Retroactively autoblocks the last IP used by the user (if it is a user)
 409         * blocked by this Block.
 410         *@return Whether or not a retroactive autoblock was made.
 411         */
 412         function doRetroactiveAutoblock() {
 413                 $dbr = wfGetDB( DB_SLAVE );
 414                 #If autoblock is enabled, autoblock the LAST IP used
 415                 # - stolen shamelessly from CheckUser_body.php
 416
 417                 if ($this->mEnableAutoblock && $this->mUser) {
 418                         wfDebug("Doing retroactive autoblocks for " . $this->mAddress . "\n");
 419
 420                         $row = $dbr->selectRow( 'recentchanges', array( 'rc_ip' ), array( 'rc_user_text' => $this->mAddress ),
 421                                 __METHOD__ , array( 'ORDER BY' => 'rc_timestamp DESC' ) );
 422
 423                         if ( !$row || !$row->rc_ip ) {
 424                                 #No results, don't autoblock anything
 425                                 wfDebug("No IP found to retroactively autoblock\n");
 426                         } else {
 427                                 #Limit is 1, so no loop needed.
 428                                 $retroblockip = $row->rc_ip;
 429                                 return $this->doAutoblock($retroblockip);
 430                         }
 431                 }
 432         }
 433
 434         /**
 435         * Autoblocks the given IP, referring to this Block.
 436         * @param $autoblockip The IP to autoblock.
 437         * @return bool Whether or not an autoblock was inserted.
 438         */
 439         function doAutoblock( $autoblockip ) {
 440                 # Check if this IP address is already blocked
 441                 $dbw = wfGetDB( DB_MASTER );
 442                 $dbw->begin();
 443
 444                 # If autoblocks are disabled, go away.
 445                 if ( !$this->mEnableAutoblock ) {
 446                         return;
 447                 }
 448
 449                 # Check for presence on the autoblock whitelist
 450                 # TODO cache this?
 451                 $lines = explode( "\n", wfMsgForContentNoTrans( 'autoblock_whitelist' ) );
 452
 453                 $ip = $autoblockip;
 454
 455                 wfDebug("Checking the autoblock whitelist..\n");
 456
 457                 foreach( $lines as $line ) {
 458                         # List items only
 459                         if ( substr( $line, 0, 1 ) !== '*' ) {
 460                                 continue;
 461                         }
 462
 463                         $wlEntry = substr($line, 1);
 464                         $wlEntry = trim($wlEntry);
 465
 466                         wfDebug("Checking $ip against $wlEntry...");
 467
 468                         # Is the IP in this range?
 469                         if (IP::isInRange( $ip, $wlEntry )) {
 470                                 wfDebug(" IP $ip matches $wlEntry, not autoblocking\n");
 471                                 #$autoblockip = null; # Don't autoblock a whitelisted IP.
 472                                 return; #This /SHOULD/ introduce a dummy block - but
 473                                         # I don't know a safe way to do so. -werdna
 474                         } else {
 475                                 wfDebug( " No match\n" );
 476                         }
 477                 }
 478
 479                 # It's okay to autoblock. Go ahead and create/insert the block.
 480
 481                 $ipblock = Block::newFromDB( $autoblockip );
 482                 if ( $ipblock ) {
 483                         # If the user is already blocked. Then check if the autoblock would
 484                         # exceed the user block. If it would exceed, then do nothing, else
 485                         # prolong block time
 486                         if ($this->mExpiry &&
 487                         ($this->mExpiry < Block::getAutoblockExpiry($ipblock->mTimestamp))) {
 488                                 return;
 489                         }
 490                         # Just update the timestamp
 491                         $ipblock->updateTimestamp();
 492                         return;
 493                 } else {
 494                         $ipblock = new Block;
 495                 }
 496
 497                 # Make a new block object with the desired properties
 498                 wfDebug( "Autoblocking {$this->mAddress}@" . $autoblockip . "\n" );
 499                 $ipblock->mAddress = $autoblockip;
 500                 $ipblock->mUser = 0;
 501                 $ipblock->mBy = $this->mBy;
 502                 $ipblock->mReason = wfMsgForContent( 'autoblocker', $this->mAddress, $this->mReason );
 503                 $ipblock->mTimestamp = wfTimestampNow();
 504                 $ipblock->mAuto = 1;
 505                 $ipblock->mCreateAccount = $this->mCreateAccount;
 506                 # Continue suppressing the name if needed
 507                 $ipblock->mHideName = $this->mHideName;
 508
 509                 # If the user is already blocked with an expiry date, we don't
 510                 # want to pile on top of that!
 511                 if($this->mExpiry) {
 512                         $ipblock->mExpiry = min ( $this->mExpiry, Block::getAutoblockExpiry( $this->mTimestamp ));
 513                 } else {
 514                         $ipblock->mExpiry = Block::getAutoblockExpiry( $this->mTimestamp );
 515                 }
 516                 # Insert it
 517                 return $ipblock->insert();
 518         }
 519
 520         function deleteIfExpired()
 521         {
 522                 $fname = 'Block::deleteIfExpired';
 523                 wfProfileIn( $fname );
 524                 if ( $this->isExpired() ) {
 525                         wfDebug( "Block::deleteIfExpired() -- deleting\n" );
 526                         $this->delete();
 527                         $retVal = true;
 528                 } else {
 529                         wfDebug( "Block::deleteIfExpired() -- not expired\n" );
 530                         $retVal = false;
 531                 }
 532                 wfProfileOut( $fname );
 533                 return $retVal;
 534         }
 535
 536         function isExpired()
 537         {
 538                 wfDebug( "Block::isExpired() checking current " . wfTimestampNow() . " vs $this->mExpiry\n" );
 539                 if ( !$this->mExpiry ) {
 540                         return false;
 541                 } else {
 542                         return wfTimestampNow() > $this->mExpiry;
 543                 }
 544         }
 545
 546         function isValid()
 547         {
 548                 return $this->mAddress != '';
 549         }
 550
 551         function updateTimestamp()
 552         {
 553                 if ( $this->mAuto ) {
 554                         $this->mTimestamp = wfTimestamp();
 555                         $this->mExpiry = Block::getAutoblockExpiry( $this->mTimestamp );
 556
 557                         $dbw = wfGetDB( DB_MASTER );
 558                         $dbw->update( 'ipblocks',
 559                                 array( /* SET */
 560                                         'ipb_timestamp' => $dbw->timestamp($this->mTimestamp),
 561                                         'ipb_expiry' => $dbw->timestamp($this->mExpiry),
 562                                 ), array( /* WHERE */
 563                                         'ipb_address' => $this->mAddress
 564                                 ), 'Block::updateTimestamp'
 565                         );
 566                 }
 567         }
 568
 569         /*
 570         function getIntegerAddr()
 571         {
 572                 return $this->mIntegerAddr;
 573         }
 574
 575         function getNetworkBits()
 576         {
 577                 return $this->mNetworkBits;
 578         }*/
 579
 580         /**
 581          * @return The blocker user ID.
 582          */
 583         public function getBy() {
 584                 return $this->mBy;
 585         }
 586
 587         /**
 588          * @return The blocker user name.
 589          */
 590         function getByName()
 591         {
 592                 if ( $this->mByName === false ) {
 593                         $this->mByName = User::whoIs( $this->mBy );
 594                 }
 595                 return $this->mByName;
 596         }
 597
 598         function forUpdate( $x = NULL ) {
 599                 return wfSetVar( $this->mForUpdate, $x );
 600         }
 601
 602         function fromMaster( $x = NULL ) {
 603                 return wfSetVar( $this->mFromMaster, $x );
 604         }
 605
 606         function getRedactedName() {
 607                 if ( $this->mAuto ) {
 608                         return '#' . $this->mId;
 609                 } else {
 610                         return $this->mAddress;
 611                 }
 612         }
 613
 614         /**
 615          * Encode expiry for DB
 616          */
 617         static function encodeExpiry( $expiry, $db ) {
 618                 if ( $expiry == '' || $expiry == Block::infinity() ) {
 619                         return Block::infinity();
 620                 } else {
 621                         return $db->timestamp( $expiry );
 622                 }
 623         }
 624
 625         /**
 626          * Decode expiry which has come from the DB
 627          */
 628         static function decodeExpiry( $expiry ) {
 629                 if ( $expiry == '' || $expiry == Block::infinity() ) {
 630                         return Block::infinity();
 631                 } else {
 632                         return wfTimestamp( TS_MW, $expiry );
 633                 }
 634         }
 635
 636         static function getAutoblockExpiry( $timestamp )
 637         {
 638                 global $wgAutoblockExpiry;
 639                 return wfTimestamp( TS_MW, wfTimestamp( TS_UNIX, $timestamp ) + $wgAutoblockExpiry );
 640         }
 641
 642         /**
 643          * Gets rid of uneeded numbers in quad-dotted IP strings
 644          * For example, 127.111.113.151/24 -> 127.111.113.0/24
 645          */
 646         static function normaliseRange( $range ) {
 647                 // Use IPv6 functions if needed
 648                 if ( IP::isIPv6($range) ) return self::normaliseRange6( $range );
 649                 $parts = explode( '/', $range );
 650                 if ( count( $parts ) == 2 ) {
 651                         $shift = 32 - $parts[1];
 652                         $ipint = IP::toUnsigned( $parts[0] );
 653                         $ipint = $ipint >> $shift << $shift;
 654                         $newip = long2ip( $ipint );
 655                         $range = "$newip/{$parts[1]}";
 656                 }
 657                 return $range;
 658         }
 659
 660         // For IPv6
 661         static function normaliseRange6( $range ) {
 662                 $parts = explode( '/', $range );
 663                 if ( count( $parts ) == 2 ) {
 664                         $bits = $parts[1];
 665                         $ipint = IP::toUnsigned6( $parts[0] );
 666                         # Native 32 bit functions WONT work here!!!
 667                         # Convert to a padded binary number
 668                         $network = wfBaseConvert( $ipint, 10, 2, 128 );
 669                         # Truncate the last (128-$bits) bits and replace them with zeros
 670                         $network = str_pad( substr( $network, 0, $bits ), 128, 0, STR_PAD_RIGHT );
 671                         # Convert back to an integer
 672                         $network = wfBaseConvert( $network, 2, 10 );
 673                         # Reform octet address
 674                         $newip = IP::toOctet( $network );
 675                         $range = "$newip/{$parts[1]}";
 676                 }
 677                 return $range;
 678         }
 679
 680         /**
 681          * Purge expired blocks from the ipblocks table
 682          */
 683         static function purgeExpired() {
 684                 $dbw = wfGetDB( DB_MASTER );
 685                 $dbw->delete( 'ipblocks', array( 'ipb_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ), __METHOD__ );
 686         }
 687
 688         static function infinity() {
 689                 # This is a special keyword for timestamps in PostgreSQL, and
 690                 # works with CHAR(14) as well because "i" sorts after all numbers.
 691                 return 'infinity';
 692
 693                 /*
 694                 static $infinity;
 695                 if ( !isset( $infinity ) ) {
 696                         $dbr = wfGetDB( DB_SLAVE );
 697                         $infinity = $dbr->bigTimestamp();
 698                 }
 699                 return $infinity;
 700                  */
 701         }
 702
 703 }
 704 ?>