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                                 $mBlockEmail, $mByName;
  20         /* private */ var $mNetworkBits, $mIntegerAddr, $mForUpdate, $mFromMaster;
  21
  22         const EB_KEEP_EXPIRED = 1;
  23         const EB_FOR_UPDATE = 2;
  24         const EB_RANGE_ONLY = 4;
  25
  26         function __construct( $address = '', $user = 0, $by = 0, $reason = '',
  27                 $timestamp = '' , $auto = 0, $expiry = '', $anonOnly = 0, $createAccount = 0, $enableAutoblock = 0,
  28                 $hideName = 0, $blockEmail = 0 )
  29         {
  30                 $this->mId = 0;
  31                 # Expand valid IPv6 addresses
  32                 $address = IP::sanitizeIP( $address );
  33                 $this->mAddress = $address;
  34                 $this->mUser = $user;
  35                 $this->mBy = $by;
  36                 $this->mReason = $reason;
  37                 $this->mTimestamp = wfTimestamp(TS_MW,$timestamp);
  38                 $this->mAuto = $auto;
  39                 $this->mAnonOnly = $anonOnly;
  40                 $this->mCreateAccount = $createAccount;
  41                 $this->mExpiry = self::decodeExpiry( $expiry );
  42                 $this->mEnableAutoblock = $enableAutoblock;
  43                 $this->mHideName = $hideName;
  44                 $this->mBlockEmail = $blockEmail;
  45                 $this->mForUpdate = false;
  46                 $this->mFromMaster = false;
  47                 $this->mByName = false;
  48                 $this->initialiseRange();
  49         }
  50
  51         static function newFromDB( $address, $user = 0, $killExpired = true )
  52         {
  53                 $block = new Block();
  54                 $block->load( $address, $user, $killExpired );
  55                 if ( $block->isValid() ) {
  56                         return $block;
  57                 } else {
  58                         return null;
  59                 }
  60         }
  61
  62         static function newFromID( $id )
  63         {
  64                 $dbr = wfGetDB( DB_SLAVE );
  65                 $res = $dbr->resultObject( $dbr->select( 'ipblocks', '*',
  66                         array( 'ipb_id' => $id ), __METHOD__ ) );
  67                 $block = new Block;
  68                 if ( $block->loadFromResult( $res ) ) {
  69                         return $block;
  70                 } else {
  71                         return null;
  72                 }
  73         }
  74
  75         function clear()
  76         {
  77                 $this->mAddress = $this->mReason = $this->mTimestamp = '';
  78                 $this->mId = $this->mAnonOnly = $this->mCreateAccount =
  79                         $this->mEnableAutoblock = $this->mAuto = $this->mUser =
  80                         $this->mBy = $this->mHideName = $this->mBlockEmail = 0;
  81                 $this->mByName = false;
  82         }
  83
  84         /**
  85          * Get the DB object and set the reference parameter to the query options
  86          */
  87         function &getDBOptions( &$options )
  88         {
  89                 global $wgAntiLockFlags;
  90                 if ( $this->mForUpdate || $this->mFromMaster ) {
  91                         $db = wfGetDB( DB_MASTER );
  92                         if ( !$this->mForUpdate || ($wgAntiLockFlags & ALF_NO_BLOCK_LOCK) ) {
  93                                 $options = array();
  94                         } else {
  95                                 $options = array( 'FOR UPDATE' );
  96                         }
  97                 } else {
  98                         $db = wfGetDB( DB_SLAVE );
  99                         $options = array();
 100                 }
 101                 return $db;
 102         }
 103
 104         /**
 105          * Get a ban from the DB, with either the given address or the given username
 106          *
 107          * @param string $address The IP address of the user, or blank to skip IP blocks
 108          * @param integer $user The user ID, or zero for anonymous users
 109          * @param bool $killExpired Whether to delete expired rows while loading
 110          *
 111          */
 112         function load( $address = '', $user = 0, $killExpired = true )
 113         {
 114                 wfDebug( "Block::load: '$address', '$user', $killExpired\n" );
 115
 116                 $options = array();
 117                 $db =& $this->getDBOptions( $options );
 118
 119                 if ( 0 == $user && $address == '' ) {
 120                         # Invalid user specification, not blocked
 121                         $this->clear();
 122                         return false;
 123                 }
 124
 125                 # Try user block
 126                 if ( $user ) {
 127                         $res = $db->resultObject( $db->select( 'ipblocks', '*', array( 'ipb_user' => $user ),
 128                                 __METHOD__, $options ) );
 129                         if ( $this->loadFromResult( $res, $killExpired ) ) {
 130                                 return true;
 131                         }
 132                 }
 133
 134                 # Try IP block
 135                 # TODO: improve performance by merging this query with the autoblock one
 136                 # Slightly tricky while handling killExpired as well
 137                 if ( $address ) {
 138                         $conds = array( 'ipb_address' => $address, 'ipb_auto' => 0 );
 139                         $res = $db->resultObject( $db->select( 'ipblocks', '*', $conds, __METHOD__, $options ) );
 140                         if ( $this->loadFromResult( $res, $killExpired ) ) {
 141                                 if ( $user && $this->mAnonOnly ) {
 142                                         # Block is marked anon-only
 143                                         # Whitelist this IP address against autoblocks and range blocks
 144                                         $this->clear();
 145                                         return false;
 146                                 } else {
 147                                         return true;
 148                                 }
 149                         }
 150                 }
 151
 152                 # Try range block
 153                 if ( $this->loadRange( $address, $killExpired, $user ) ) {
 154                         if ( $user && $this->mAnonOnly ) {
 155                                 $this->clear();
 156                                 return false;
 157                         } else {
 158                                 return true;
 159                         }
 160                 }
 161
 162                 # Try autoblock
 163                 if ( $address ) {
 164                         $conds = array( 'ipb_address' => $address, 'ipb_auto' => 1 );
 165                         if ( $user ) {
 166                                 $conds['ipb_anon_only'] = 0;
 167                         }
 168                         $res = $db->resultObject( $db->select( 'ipblocks', '*', $conds, __METHOD__, $options ) );
 169                         if ( $this->loadFromResult( $res, $killExpired ) ) {
 170                                 return true;
 171                         }
 172                 }
 173
 174                 # Give up
 175                 $this->clear();
 176                 return false;
 177         }
 178
 179         /**
 180          * Fill in member variables from a result wrapper
 181          */
 182         function loadFromResult( ResultWrapper $res, $killExpired = true )
 183         {
 184                 $ret = false;
 185                 if ( 0 != $res->numRows() ) {
 186                         # Get first block
 187                         $row = $res->fetchObject();
 188                         $this->initFromRow( $row );
 189
 190                         if ( $killExpired ) {
 191                                 # If requested, delete expired rows
 192                                 do {
 193                                         $killed = $this->deleteIfExpired();
 194                                         if ( $killed ) {
 195                                                 $row = $res->fetchObject();
 196                                                 if ( $row ) {
 197                                                         $this->initFromRow( $row );
 198                                                 }
 199                                         }
 200                                 } while ( $killed && $row );
 201
 202                                 # If there were any left after the killing finished, return true
 203                                 if ( $row ) {
 204                                         $ret = true;
 205                                 }
 206                         } else {
 207                                 $ret = true;
 208                         }
 209                 }
 210                 $res->free();
 211                 return $ret;
 212         }
 213
 214         /**
 215          * Search the database for any range blocks matching the given address, and
 216          * load the row if one is found.
 217          */
 218         function loadRange( $address, $killExpired = true, $user = 0 )
 219         {
 220                 $iaddr = IP::toHex( $address );
 221                 if ( $iaddr === false ) {
 222                         # Invalid address
 223                         return false;
 224                 }
 225
 226                 # Only scan ranges which start in this /16, this improves search speed
 227                 # Blocks should not cross a /16 boundary.
 228                 $range = substr( $iaddr, 0, 4 );
 229
 230                 $options = array();
 231                 $db =& $this->getDBOptions( $options );
 232                 $conds = array(
 233                         "ipb_range_start LIKE '$range%'",
 234                         "ipb_range_start <= '$iaddr'",
 235                         "ipb_range_end >= '$iaddr'"
 236                 );
 237
 238                 if ( $user ) {
 239                         $conds['ipb_anon_only'] = 0;
 240                 }
 241
 242                 $res = $db->resultObject( $db->select( 'ipblocks', '*', $conds, __METHOD__, $options ) );
 243                 $success = $this->loadFromResult( $res, $killExpired );
 244                 return $success;
 245         }
 246
 247         /**
 248          * Determine if a given integer IPv4 address is in a given CIDR network
 249          * @deprecated Use IP::isInRange
 250          */
 251         function isAddressInRange( $addr, $range ) {
 252                 return IP::isInRange( $addr, $range );
 253         }
 254
 255         function initFromRow( $row )
 256         {
 257                 $this->mAddress = $row->ipb_address;
 258                 $this->mReason = $row->ipb_reason;
 259                 $this->mTimestamp = wfTimestamp(TS_MW,$row->ipb_timestamp);
 260                 $this->mUser = $row->ipb_user;
 261                 $this->mBy = $row->ipb_by;
 262                 $this->mAuto = $row->ipb_auto;
 263                 $this->mAnonOnly = $row->ipb_anon_only;
 264                 $this->mCreateAccount = $row->ipb_create_account;
 265                 $this->mEnableAutoblock = $row->ipb_enable_autoblock;
 266                 $this->mBlockEmail = $row->ipb_block_email;
 267                 $this->mHideName = $row->ipb_deleted;
 268                 $this->mId = $row->ipb_id;
 269                 $this->mExpiry = self::decodeExpiry( $row->ipb_expiry );
 270                 if ( isset( $row->user_name ) ) {
 271                         $this->mByName = $row->user_name;
 272                 } else {
 273                         $this->mByName = $row->ipb_by_text;
 274                 }
 275                 $this->mRangeStart = $row->ipb_range_start;
 276                 $this->mRangeEnd = $row->ipb_range_end;
 277         }
 278
 279         function initialiseRange()
 280         {
 281                 $this->mRangeStart = '';
 282                 $this->mRangeEnd = '';
 283
 284                 if ( $this->mUser == 0 ) {
 285                         list( $this->mRangeStart, $this->mRangeEnd ) = IP::parseRange( $this->mAddress );
 286                 }
 287         }
 288
 289         /**
 290          * Callback with a Block object for every block
 291          * @return integer number of blocks;
 292          */
 293         /*static*/ function enumBlocks( $callback, $tag, $flags = 0 )
 294         {
 295                 global $wgAntiLockFlags;
 296
 297                 $block = new Block();
 298                 if ( $flags & Block::EB_FOR_UPDATE ) {
 299                         $db = wfGetDB( DB_MASTER );
 300                         if ( $wgAntiLockFlags & ALF_NO_BLOCK_LOCK ) {
 301                                 $options = '';
 302                         } else {
 303                                 $options = 'FOR UPDATE';
 304                         }
 305                         $block->forUpdate( true );
 306                 } else {
 307                         $db = wfGetDB( DB_SLAVE );
 308                         $options = '';
 309                 }
 310                 if ( $flags & Block::EB_RANGE_ONLY ) {
 311                         $cond = " AND ipb_range_start <> ''";
 312                 } else {
 313                         $cond = '';
 314                 }
 315
 316                 $now = wfTimestampNow();
 317
 318                 list( $ipblocks, $user ) = $db->tableNamesN( 'ipblocks', 'user' );
 319
 320                 $sql = "SELECT $ipblocks.*,user_name FROM $ipblocks,$user " .
 321                         "WHERE user_id=ipb_by $cond ORDER BY ipb_timestamp DESC $options";
 322                 $res = $db->query( $sql, 'Block::enumBlocks' );
 323                 $num_rows = $db->numRows( $res );
 324
 325                 while ( $row = $db->fetchObject( $res ) ) {
 326                         $block->initFromRow( $row );
 327                         if ( ( $flags & Block::EB_RANGE_ONLY ) && $block->mRangeStart == '' ) {
 328                                 continue;
 329                         }
 330
 331                         if ( !( $flags & Block::EB_KEEP_EXPIRED ) ) {
 332                                 if ( $block->mExpiry && $now > $block->mExpiry ) {
 333                                         $block->delete();
 334                                 } else {
 335                                         call_user_func( $callback, $block, $tag );
 336                                 }
 337                         } else {
 338                                 call_user_func( $callback, $block, $tag );
 339                         }
 340                 }
 341                 $db->freeResult( $res );
 342                 return $num_rows;
 343         }
 344
 345         function delete()
 346         {
 347                 if (wfReadOnly()) {
 348                         return false;
 349                 }
 350                 if ( !$this->mId ) {
 351                         throw new MWException( "Block::delete() now requires that the mId member be filled\n" );
 352                 }
 353
 354                 $dbw = wfGetDB( DB_MASTER );
 355                 $dbw->delete( 'ipblocks', array( 'ipb_id' => $this->mId ), __METHOD__ );
 356                 return $dbw->affectedRows() > 0;
 357         }
 358
 359         /**
 360         * Insert a block into the block table.
 361         * @return Whether or not the insertion was successful.
 362         */
 363         function insert()
 364         {
 365                 wfDebug( "Block::insert; timestamp {$this->mTimestamp}\n" );
 366                 $dbw = wfGetDB( DB_MASTER );
 367
 368                 # Unset ipb_anon_only for user blocks, makes no sense
 369                 if ( $this->mUser ) {
 370                         $this->mAnonOnly = 0;
 371                 }
 372
 373                 # Unset ipb_enable_autoblock for IP blocks, makes no sense
 374                 if ( !$this->mUser ) {
 375                         $this->mEnableAutoblock = 0;
 376                         $this->mBlockEmail = 0; //Same goes for email...
 377                 }
 378
 379                 if( !$this->mByName ) {
 380                         if( $this->mBy ) {
 381                                 $this->mByName = User::whoIs( $this->mBy );
 382                         } else {
 383                                 global $wgUser;
 384                                 $this->mByName = $wgUser->getName();
 385                         }
 386                 }
 387
 388                 # Don't collide with expired blocks
 389                 Block::purgeExpired();
 390
 391                 $ipb_id = $dbw->nextSequenceValue('ipblocks_ipb_id_val');
 392                 $dbw->insert( 'ipblocks',
 393                         array(
 394                                 'ipb_id' => $ipb_id,
 395                                 'ipb_address' => $this->mAddress,
 396                                 'ipb_user' => $this->mUser,
 397                                 'ipb_by' => $this->mBy,
 398                                 'ipb_by_text' => $this->mByName,
 399                                 'ipb_reason' => $this->mReason,
 400                                 'ipb_timestamp' => $dbw->timestamp($this->mTimestamp),
 401                                 'ipb_auto' => $this->mAuto,
 402                                 'ipb_anon_only' => $this->mAnonOnly,
 403                                 'ipb_create_account' => $this->mCreateAccount,
 404                                 'ipb_enable_autoblock' => $this->mEnableAutoblock,
 405                                 'ipb_expiry' => self::encodeExpiry( $this->mExpiry, $dbw ),
 406                                 'ipb_range_start' => $this->mRangeStart,
 407                                 'ipb_range_end' => $this->mRangeEnd,
 408                                 'ipb_deleted'   => $this->mHideName,
 409                                 'ipb_block_email' => $this->mBlockEmail
 410                         ), 'Block::insert', array( 'IGNORE' )
 411                 );
 412                 $affected = $dbw->affectedRows();
 413
 414                 if ($affected)
 415                         $this->doRetroactiveAutoblock();
 416
 417                 return $affected;
 418         }
 419
 420         /**
 421         * Retroactively autoblocks the last IP used by the user (if it is a user)
 422         * blocked by this Block.
 423         *@return Whether or not a retroactive autoblock was made.
 424         */
 425         function doRetroactiveAutoblock() {
 426                 $dbr = wfGetDB( DB_SLAVE );
 427                 #If autoblock is enabled, autoblock the LAST IP used
 428                 # - stolen shamelessly from CheckUser_body.php
 429
 430                 if ($this->mEnableAutoblock && $this->mUser) {
 431                         wfDebug("Doing retroactive autoblocks for " . $this->mAddress . "\n");
 432
 433                         $row = $dbr->selectRow( 'recentchanges', array( 'rc_ip' ), array( 'rc_user_text' => $this->mAddress ),
 434                                 __METHOD__ , array( 'ORDER BY' => 'rc_timestamp DESC' ) );
 435
 436                         if ( !$row || !$row->rc_ip ) {
 437                                 #No results, don't autoblock anything
 438                                 wfDebug("No IP found to retroactively autoblock\n");
 439                         } else {
 440                                 #Limit is 1, so no loop needed.
 441                                 $retroblockip = $row->rc_ip;
 442                                 return $this->doAutoblock( $retroblockip, true );
 443                         }
 444                 }
 445         }
 446
 447         /**
 448         * Autoblocks the given IP, referring to this Block.
 449         * @param string $autoblockip The IP to autoblock.
 450         * @param bool $justInserted The main block was just inserted
 451         * @return bool Whether or not an autoblock was inserted.
 452         */
 453         function doAutoblock( $autoblockip, $justInserted = false ) {
 454                 # If autoblocks are disabled, go away.
 455                 if ( !$this->mEnableAutoblock ) {
 456                         return;
 457                 }
 458
 459                 # Check for presence on the autoblock whitelist
 460                 # TODO cache this?
 461                 $lines = explode( "\n", wfMsgForContentNoTrans( 'autoblock_whitelist' ) );
 462
 463                 $ip = $autoblockip;
 464
 465                 wfDebug("Checking the autoblock whitelist..\n");
 466
 467                 foreach( $lines as $line ) {
 468                         # List items only
 469                         if ( substr( $line, 0, 1 ) !== '*' ) {
 470                                 continue;
 471                         }
 472
 473                         $wlEntry = substr($line, 1);
 474                         $wlEntry = trim($wlEntry);
 475
 476                         wfDebug("Checking $ip against $wlEntry...");
 477
 478                         # Is the IP in this range?
 479                         if (IP::isInRange( $ip, $wlEntry )) {
 480                                 wfDebug(" IP $ip matches $wlEntry, not autoblocking\n");
 481                                 #$autoblockip = null; # Don't autoblock a whitelisted IP.
 482                                 return; #This /SHOULD/ introduce a dummy block - but
 483                                         # I don't know a safe way to do so. -werdna
 484                         } else {
 485                                 wfDebug( " No match\n" );
 486                         }
 487                 }
 488
 489                 # It's okay to autoblock. Go ahead and create/insert the block.
 490
 491                 $ipblock = Block::newFromDB( $autoblockip );
 492                 if ( $ipblock ) {
 493                         # If the user is already blocked. Then check if the autoblock would
 494                         # exceed the user block. If it would exceed, then do nothing, else
 495                         # prolong block time
 496                         if ($this->mExpiry &&
 497                         ($this->mExpiry < Block::getAutoblockExpiry($ipblock->mTimestamp))) {
 498                                 return;
 499                         }
 500                         # Just update the timestamp
 501                         if ( !$justInserted ) {
 502                                 $ipblock->updateTimestamp();
 503                         }
 504                         return;
 505                 } else {
 506                         $ipblock = new Block;
 507                 }
 508
 509                 # Make a new block object with the desired properties
 510                 wfDebug( "Autoblocking {$this->mAddress}@" . $autoblockip . "\n" );
 511                 $ipblock->mAddress = $autoblockip;
 512                 $ipblock->mUser = 0;
 513                 $ipblock->mBy = $this->mBy;
 514                 $ipblock->mReason = wfMsgForContent( 'autoblocker', $this->mAddress, $this->mReason );
 515                 $ipblock->mTimestamp = wfTimestampNow();
 516                 $ipblock->mAuto = 1;
 517                 $ipblock->mCreateAccount = $this->mCreateAccount;
 518                 # Continue suppressing the name if needed
 519                 $ipblock->mHideName = $this->mHideName;
 520
 521                 # If the user is already blocked with an expiry date, we don't
 522                 # want to pile on top of that!
 523                 if($this->mExpiry) {
 524                         $ipblock->mExpiry = min ( $this->mExpiry, Block::getAutoblockExpiry( $this->mTimestamp ));
 525                 } else {
 526                         $ipblock->mExpiry = Block::getAutoblockExpiry( $this->mTimestamp );
 527                 }
 528                 # Insert it
 529                 return $ipblock->insert();
 530         }
 531
 532         function deleteIfExpired()
 533         {
 534                 $fname = 'Block::deleteIfExpired';
 535                 wfProfileIn( $fname );
 536                 if ( $this->isExpired() ) {
 537                         wfDebug( "Block::deleteIfExpired() -- deleting\n" );
 538                         $this->delete();
 539                         $retVal = true;
 540                 } else {
 541                         wfDebug( "Block::deleteIfExpired() -- not expired\n" );
 542                         $retVal = false;
 543                 }
 544                 wfProfileOut( $fname );
 545                 return $retVal;
 546         }
 547
 548         function isExpired()
 549         {
 550                 wfDebug( "Block::isExpired() checking current " . wfTimestampNow() . " vs $this->mExpiry\n" );
 551                 if ( !$this->mExpiry ) {
 552                         return false;
 553                 } else {
 554                         return wfTimestampNow() > $this->mExpiry;
 555                 }
 556         }
 557
 558         function isValid()
 559         {
 560                 return $this->mAddress != '';
 561         }
 562
 563         function updateTimestamp()
 564         {
 565                 if ( $this->mAuto ) {
 566                         $this->mTimestamp = wfTimestamp();
 567                         $this->mExpiry = Block::getAutoblockExpiry( $this->mTimestamp );
 568
 569                         $dbw = wfGetDB( DB_MASTER );
 570                         $dbw->update( 'ipblocks',
 571                                 array( /* SET */
 572                                         'ipb_timestamp' => $dbw->timestamp($this->mTimestamp),
 573                                         'ipb_expiry' => $dbw->timestamp($this->mExpiry),
 574                                 ), array( /* WHERE */
 575                                         'ipb_address' => $this->mAddress
 576                                 ), 'Block::updateTimestamp'
 577                         );
 578                 }
 579         }
 580
 581         /*
 582         function getIntegerAddr()
 583         {
 584                 return $this->mIntegerAddr;
 585         }
 586
 587         function getNetworkBits()
 588         {
 589                 return $this->mNetworkBits;
 590         }*/
 591
 592         /**
 593          * @return The blocker user ID.
 594          */
 595         public function getBy() {
 596                 return $this->mBy;
 597         }
 598
 599         /**
 600          * @return The blocker user name.
 601          */
 602         function getByName()
 603         {
 604                 return $this->mByName;
 605         }
 606
 607         function forUpdate( $x = NULL ) {
 608                 return wfSetVar( $this->mForUpdate, $x );
 609         }
 610
 611         function fromMaster( $x = NULL ) {
 612                 return wfSetVar( $this->mFromMaster, $x );
 613         }
 614
 615         function getRedactedName() {
 616                 if ( $this->mAuto ) {
 617                         return '#' . $this->mId;
 618                 } else {
 619                         return $this->mAddress;
 620                 }
 621         }
 622
 623         /**
 624          * Encode expiry for DB
 625          */
 626         static function encodeExpiry( $expiry, $db ) {
 627                 if ( $expiry == '' || $expiry == Block::infinity() ) {
 628                         return Block::infinity();
 629                 } else {
 630                         return $db->timestamp( $expiry );
 631                 }
 632         }
 633
 634         /**
 635          * Decode expiry which has come from the DB
 636          */
 637         static function decodeExpiry( $expiry, $timestampType = TS_MW ) {
 638                 if ( $expiry == '' || $expiry == Block::infinity() ) {
 639                         return Block::infinity();
 640                 } else {
 641                         return wfTimestamp( $timestampType, $expiry );
 642                 }
 643         }
 644
 645         static function getAutoblockExpiry( $timestamp )
 646         {
 647                 global $wgAutoblockExpiry;
 648                 return wfTimestamp( TS_MW, wfTimestamp( TS_UNIX, $timestamp ) + $wgAutoblockExpiry );
 649         }
 650
 651         /**
 652          * Gets rid of uneeded numbers in quad-dotted/octet IP strings
 653          * For example, 127.111.113.151/24 -> 127.111.113.0/24
 654          */
 655         static function normaliseRange( $range ) {
 656                 $parts = explode( '/', $range );
 657                 if ( count( $parts ) == 2 ) {
 658                         // IPv6
 659                         if ( IP::isIPv6($range) && $parts[1] >= 64 && $parts[1] <= 128 ) {
 660                                 $bits = $parts[1];
 661                                 $ipint = IP::toUnsigned6( $parts[0] );
 662                                 # Native 32 bit functions WONT work here!!!
 663                                 # Convert to a padded binary number
 664                                 $network = wfBaseConvert( $ipint, 10, 2, 128 );
 665                                 # Truncate the last (128-$bits) bits and replace them with zeros
 666                                 $network = str_pad( substr( $network, 0, $bits ), 128, 0, STR_PAD_RIGHT );
 667                                 # Convert back to an integer
 668                                 $network = wfBaseConvert( $network, 2, 10 );
 669                                 # Reform octet address
 670                                 $newip = IP::toOctet( $network );
 671                                 $range = "$newip/{$parts[1]}";
 672                         } // IPv4
 673                         else if ( IP::isIPv4($range) && $parts[1] >= 16 && $parts[1] <= 32 ) {
 674                                 $shift = 32 - $parts[1];
 675                                 $ipint = IP::toUnsigned( $parts[0] );
 676                                 $ipint = $ipint >> $shift << $shift;
 677                                 $newip = long2ip( $ipint );
 678                                 $range = "$newip/{$parts[1]}";
 679                         }
 680                 }
 681                 return $range;
 682         }
 683
 684         /**
 685          * Purge expired blocks from the ipblocks table
 686          */
 687         static function purgeExpired() {
 688                 $dbw = wfGetDB( DB_MASTER );
 689                 $dbw->delete( 'ipblocks', array( 'ipb_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ), __METHOD__ );
 690         }
 691
 692         static function infinity() {
 693                 # This is a special keyword for timestamps in PostgreSQL, and
 694                 # works with CHAR(14) as well because "i" sorts after all numbers.
 695                 return 'infinity';
 696
 697                 /*
 698                 static $infinity;
 699                 if ( !isset( $infinity ) ) {
 700                         $dbr = wfGetDB( DB_SLAVE );
 701                         $infinity = $dbr->bigTimestamp();
 702                 }
 703                 return $infinity;
 704                  */
 705         }
 706
 707 }