includes/Block.php

   1 <?php
   2 /**
   3  * @file
   4  * Blocks and bans object
   5  */
   6
   7 /**
   8  * The block class
   9  * All the functions in this class assume the object is either explicitly
  10  * loaded or filled. It is not load-on-demand. There are no accessors.
  11  *
  12  * Globals used: $wgAutoblockExpiry, $wgAntiLockFlags
  13  *
  14  * @todo This could be used everywhere, but it isn't.
  15  */
  16 class Block
  17 {
  18         /* public*/ var $mAddress, $mUser, $mBy, $mReason, $mTimestamp, $mAuto, $mId, $mExpiry,
  19                                 $mRangeStart, $mRangeEnd, $mAnonOnly, $mEnableAutoblock, $mHideName,
  20                                 $mBlockEmail, $mByName;
  21         /* private */ var $mNetworkBits, $mIntegerAddr, $mForUpdate, $mFromMaster;
  22
  23         const EB_KEEP_EXPIRED = 1;
  24         const EB_FOR_UPDATE = 2;
  25         const EB_RANGE_ONLY = 4;
  26
  27         function __construct( $address = '', $user = 0, $by = 0, $reason = '',
  28                 $timestamp = '' , $auto = 0, $expiry = '', $anonOnly = 0, $createAccount = 0, $enableAutoblock = 0,
  29                 $hideName = 0, $blockEmail = 0 )
  30         {
  31                 $this->mId = 0;
  32                 # Expand valid IPv6 addresses
  33                 $address = IP::sanitizeIP( $address );
  34                 $this->mAddress = $address;
  35                 $this->mUser = $user;
  36                 $this->mBy = $by;
  37                 $this->mReason = $reason;
  38                 $this->mTimestamp = wfTimestamp(TS_MW,$timestamp);
  39                 $this->mAuto = $auto;
  40                 $this->mAnonOnly = $anonOnly;
  41                 $this->mCreateAccount = $createAccount;
  42                 $this->mExpiry = self::decodeExpiry( $expiry );
  43                 $this->mEnableAutoblock = $enableAutoblock;
  44                 $this->mHideName = $hideName;
  45                 $this->mBlockEmail = $blockEmail;
  46                 $this->mForUpdate = false;
  47                 $this->mFromMaster = false;
  48                 $this->mByName = false;
  49                 $this->initialiseRange();
  50         }
  51
  52         static function newFromDB( $address, $user = 0, $killExpired = true )
  53         {
  54                 $block = new Block();
  55                 $block->load( $address, $user, $killExpired );
  56                 if ( $block->isValid() ) {
  57                         return $block;
  58                 } else {
  59                         return null;
  60                 }
  61         }
  62
  63         static function newFromID( $id )
  64         {
  65                 $dbr = wfGetDB( DB_SLAVE );
  66                 $res = $dbr->resultObject( $dbr->select( 'ipblocks', '*',
  67                         array( 'ipb_id' => $id ), __METHOD__ ) );
  68                 $block = new Block;
  69                 if ( $block->loadFromResult( $res ) ) {
  70                         return $block;
  71                 } else {
  72                         return null;
  73                 }
  74         }
  75
  76         function clear()
  77         {
  78                 $this->mAddress = $this->mReason = $this->mTimestamp = '';
  79                 $this->mId = $this->mAnonOnly = $this->mCreateAccount =
  80                         $this->mEnableAutoblock = $this->mAuto = $this->mUser =
  81                         $this->mBy = $this->mHideName = $this->mBlockEmail = 0;
  82                 $this->mByName = false;
  83         }
  84
  85         /**
  86          * Get the DB object and set the reference parameter to the query options
  87          */
  88         function &getDBOptions( &$options )
  89         {
  90                 global $wgAntiLockFlags;
  91                 if ( $this->mForUpdate || $this->mFromMaster ) {
  92                         $db = wfGetDB( DB_MASTER );
  93                         if ( !$this->mForUpdate || ($wgAntiLockFlags & ALF_NO_BLOCK_LOCK) ) {
  94                                 $options = array();
  95                         } else {
  96                                 $options = array( 'FOR UPDATE' );
  97                         }
  98                 } else {
  99                         $db = wfGetDB( DB_SLAVE );
 100                         $options = array();
 101                 }
 102                 return $db;
 103         }
 104
 105         /**
 106          * Get a ban from the DB, with either the given address or the given username
 107          *
 108          * @param string $address The IP address of the user, or blank to skip IP blocks
 109          * @param integer $user The user ID, or zero for anonymous users
 110          * @param bool $killExpired Whether to delete expired rows while loading
 111          *
 112          */
 113         function load( $address = '', $user = 0, $killExpired = true )
 114         {
 115                 wfDebug( "Block::load: '$address', '$user', $killExpired\n" );
 116
 117                 $options = array();
 118                 $db =& $this->getDBOptions( $options );
 119
 120                 if ( 0 == $user && $address == '' ) {
 121                         # Invalid user specification, not blocked
 122                         $this->clear();
 123                         return false;
 124                 }
 125
 126                 # Try user block
 127                 if ( $user ) {
 128                         $res = $db->resultObject( $db->select( 'ipblocks', '*', array( 'ipb_user' => $user ),
 129                                 __METHOD__, $options ) );
 130                         if ( $this->loadFromResult( $res, $killExpired ) ) {
 131                                 return true;
 132                         }
 133                 }
 134
 135                 # Try IP block
 136                 # TODO: improve performance by merging this query with the autoblock one
 137                 # Slightly tricky while handling killExpired as well
 138                 if ( $address ) {
 139                         $conds = array( 'ipb_address' => $address, 'ipb_auto' => 0 );
 140                         $res = $db->resultObject( $db->select( 'ipblocks', '*', $conds, __METHOD__, $options ) );
 141                         if ( $this->loadFromResult( $res, $killExpired ) ) {
 142                                 if ( $user && $this->mAnonOnly ) {
 143                                         # Block is marked anon-only
 144                                         # Whitelist this IP address against autoblocks and range blocks
 145                                         $this->clear();
 146                                         return false;
 147                                 } else {
 148                                         return true;
 149                                 }
 150                         }
 151                 }
 152
 153                 # Try range block
 154                 if ( $this->loadRange( $address, $killExpired, $user ) ) {
 155                         if ( $user && $this->mAnonOnly ) {
 156                                 $this->clear();
 157                                 return false;
 158                         } else {
 159                                 return true;
 160                         }
 161                 }
 162
 163                 # Try autoblock
 164                 if ( $address ) {
 165                         $conds = array( 'ipb_address' => $address, 'ipb_auto' => 1 );
 166                         if ( $user ) {
 167                                 $conds['ipb_anon_only'] = 0;
 168                         }
 169                         $res = $db->resultObject( $db->select( 'ipblocks', '*', $conds, __METHOD__, $options ) );
 170                         if ( $this->loadFromResult( $res, $killExpired ) ) {
 171                                 return true;
 172                         }
 173                 }
 174
 175                 # Give up
 176                 $this->clear();
 177                 return false;
 178         }
 179
 180         /**
 181          * Fill in member variables from a result wrapper
 182          */
 183         function loadFromResult( ResultWrapper $res, $killExpired = true )
 184         {
 185                 $ret = false;
 186                 if ( 0 != $res->numRows() ) {
 187                         # Get first block
 188                         $row = $res->fetchObject();
 189                         $this->initFromRow( $row );
 190
 191                         if ( $killExpired ) {
 192                                 # If requested, delete expired rows
 193                                 do {
 194                                         $killed = $this->deleteIfExpired();
 195                                         if ( $killed ) {
 196                                                 $row = $res->fetchObject();
 197                                                 if ( $row ) {
 198                                                         $this->initFromRow( $row );
 199                                                 }
 200                                         }
 201                                 } while ( $killed && $row );
 202
 203                                 # If there were any left after the killing finished, return true
 204                                 if ( $row ) {
 205                                         $ret = true;
 206                                 }
 207                         } else {
 208                                 $ret = true;
 209                         }
 210                 }
 211                 $res->free();
 212                 return $ret;
 213         }
 214
 215         /**
 216          * Search the database for any range blocks matching the given address, and
 217          * load the row if one is found.
 218          */
 219         function loadRange( $address, $killExpired = true, $user = 0 )
 220         {
 221                 $iaddr = IP::toHex( $address );
 222                 if ( $iaddr === false ) {
 223                         # Invalid address
 224                         return false;
 225                 }
 226
 227                 # Only scan ranges which start in this /16, this improves search speed
 228                 # Blocks should not cross a /16 boundary.
 229                 $range = substr( $iaddr, 0, 4 );
 230
 231                 $options = array();
 232                 $db =& $this->getDBOptions( $options );
 233                 $conds = array(
 234                         "ipb_range_start LIKE '$range%'",
 235                         "ipb_range_start <= '$iaddr'",
 236                         "ipb_range_end >= '$iaddr'"
 237                 );
 238
 239                 if ( $user ) {
 240                         $conds['ipb_anon_only'] = 0;
 241                 }
 242
 243                 $res = $db->resultObject( $db->select( 'ipblocks', '*', $conds, __METHOD__, $options ) );
 244                 $success = $this->loadFromResult( $res, $killExpired );
 245                 return $success;
 246         }
 247
 248         /**
 249          * Determine if a given integer IPv4 address is in a given CIDR network
 250          * @deprecated Use IP::isInRange
 251          */
 252         function isAddressInRange( $addr, $range ) {
 253                 return IP::isInRange( $addr, $range );
 254         }
 255
 256         function initFromRow( $row )
 257         {
 258                 $this->mAddress = $row->ipb_address;
 259                 $this->mReason = $row->ipb_reason;
 260                 $this->mTimestamp = wfTimestamp(TS_MW,$row->ipb_timestamp);
 261                 $this->mUser = $row->ipb_user;
 262                 $this->mBy = $row->ipb_by;
 263                 $this->mAuto = $row->ipb_auto;
 264                 $this->mAnonOnly = $row->ipb_anon_only;
 265                 $this->mCreateAccount = $row->ipb_create_account;
 266                 $this->mEnableAutoblock = $row->ipb_enable_autoblock;
 267                 $this->mBlockEmail = $row->ipb_block_email;
 268                 $this->mHideName = $row->ipb_deleted;
 269                 $this->mId = $row->ipb_id;
 270                 $this->mExpiry = self::decodeExpiry( $row->ipb_expiry );
 271                 if ( isset( $row->user_name ) ) {
 272                         $this->mByName = $row->user_name;
 273                 } else {
 274                         $this->mByName = $row->ipb_by_text;
 275                 }
 276                 $this->mRangeStart = $row->ipb_range_start;
 277                 $this->mRangeEnd = $row->ipb_range_end;
 278         }
 279
 280         function initialiseRange()
 281         {
 282                 $this->mRangeStart = '';
 283                 $this->mRangeEnd = '';
 284
 285                 if ( $this->mUser == 0 ) {
 286                         list( $this->mRangeStart, $this->mRangeEnd ) = IP::parseRange( $this->mAddress );
 287                 }
 288         }
 289
 290         /**
 291          * Callback with a Block object for every block
 292          * @return integer number of blocks;
 293          */
 294         /*static*/ function enumBlocks( $callback, $tag, $flags = 0 )
 295         {
 296                 global $wgAntiLockFlags;
 297
 298                 $block = new Block();
 299                 if ( $flags & Block::EB_FOR_UPDATE ) {
 300                         $db = wfGetDB( DB_MASTER );
 301                         if ( $wgAntiLockFlags & ALF_NO_BLOCK_LOCK ) {
 302                                 $options = '';
 303                         } else {
 304                                 $options = 'FOR UPDATE';
 305                         }
 306                         $block->forUpdate( true );
 307                 } else {
 308                         $db = wfGetDB( DB_SLAVE );
 309                         $options = '';
 310                 }
 311                 if ( $flags & Block::EB_RANGE_ONLY ) {
 312                         $cond = " AND ipb_range_start <> ''";
 313                 } else {
 314                         $cond = '';
 315                 }
 316
 317                 $now = wfTimestampNow();
 318
 319                 list( $ipblocks, $user ) = $db->tableNamesN( 'ipblocks', 'user' );
 320
 321                 $sql = "SELECT $ipblocks.*,user_name FROM $ipblocks,$user " .
 322                         "WHERE user_id=ipb_by $cond ORDER BY ipb_timestamp DESC $options";
 323                 $res = $db->query( $sql, 'Block::enumBlocks' );
 324                 $num_rows = $db->numRows( $res );
 325
 326                 while ( $row = $db->fetchObject( $res ) ) {
 327                         $block->initFromRow( $row );
 328                         if ( ( $flags & Block::EB_RANGE_ONLY ) && $block->mRangeStart == '' ) {
 329                                 continue;
 330                         }
 331
 332                         if ( !( $flags & Block::EB_KEEP_EXPIRED ) ) {
 333                                 if ( $block->mExpiry && $now > $block->mExpiry ) {
 334                                         $block->delete();
 335                                 } else {
 336                                         call_user_func( $callback, $block, $tag );
 337                                 }
 338                         } else {
 339                                 call_user_func( $callback, $block, $tag );
 340                         }
 341                 }
 342                 $db->freeResult( $res );
 343                 return $num_rows;
 344         }
 345
 346         function delete()
 347         {
 348                 if (wfReadOnly()) {
 349                         return false;
 350                 }
 351                 if ( !$this->mId ) {
 352                         throw new MWException( "Block::delete() now requires that the mId member be filled\n" );
 353                 }
 354
 355                 $dbw = wfGetDB( DB_MASTER );
 356                 $dbw->delete( 'ipblocks', array( 'ipb_id' => $this->mId ), __METHOD__ );
 357                 return $dbw->affectedRows() > 0;
 358         }
 359
 360         /**
 361         * Insert a block into the block table.
 362         * @return Whether or not the insertion was successful.
 363         */
 364         function insert()
 365         {
 366                 wfDebug( "Block::insert; timestamp {$this->mTimestamp}\n" );
 367                 $dbw = wfGetDB( DB_MASTER );
 368
 369                 # Unset ipb_anon_only for user blocks, makes no sense
 370                 if ( $this->mUser ) {
 371                         $this->mAnonOnly = 0;
 372                 }
 373
 374                 # Unset ipb_enable_autoblock for IP blocks, makes no sense
 375                 if ( !$this->mUser ) {
 376                         $this->mEnableAutoblock = 0;
 377                         $this->mBlockEmail = 0; //Same goes for email...
 378                 }
 379
 380                 if( !$this->mByName ) {
 381                         if( $this->mBy ) {
 382                                 $this->mByName = User::whoIs( $this->mBy );
 383                         } else {
 384                                 global $wgUser;
 385                                 $this->mByName = $wgUser->getName();
 386                         }
 387                 }
 388
 389                 # Don't collide with expired blocks
 390                 Block::purgeExpired();
 391
 392                 $ipb_id = $dbw->nextSequenceValue('ipblocks_ipb_id_val');
 393                 $dbw->insert( 'ipblocks',
 394                         array(
 395                                 'ipb_id' => $ipb_id,
 396                                 'ipb_address' => $this->mAddress,
 397                                 'ipb_user' => $this->mUser,
 398                                 'ipb_by' => $this->mBy,
 399                                 'ipb_by_text' => $this->mByName,
 400                                 'ipb_reason' => $this->mReason,
 401                                 'ipb_timestamp' => $dbw->timestamp($this->mTimestamp),
 402                                 'ipb_auto' => $this->mAuto,
 403                                 'ipb_anon_only' => $this->mAnonOnly,
 404                                 'ipb_create_account' => $this->mCreateAccount,
 405                                 'ipb_enable_autoblock' => $this->mEnableAutoblock,
 406                                 'ipb_expiry' => self::encodeExpiry( $this->mExpiry, $dbw ),
 407                                 'ipb_range_start' => $this->mRangeStart,
 408                                 'ipb_range_end' => $this->mRangeEnd,
 409                                 'ipb_deleted'   => $this->mHideName,
 410                                 'ipb_block_email' => $this->mBlockEmail
 411                         ), 'Block::insert', array( 'IGNORE' )
 412                 );
 413                 $affected = $dbw->affectedRows();
 414
 415                 if ($affected)
 416                         $this->doRetroactiveAutoblock();
 417
 418                 return $affected;
 419         }
 420
 421         /**
 422         * Retroactively autoblocks the last IP used by the user (if it is a user)
 423         * blocked by this Block.
 424         *@return Whether or not a retroactive autoblock was made.
 425         */
 426         function doRetroactiveAutoblock() {
 427                 $dbr = wfGetDB( DB_SLAVE );
 428                 #If autoblock is enabled, autoblock the LAST IP used
 429                 # - stolen shamelessly from CheckUser_body.php
 430
 431                 if ($this->mEnableAutoblock && $this->mUser) {
 432                         wfDebug("Doing retroactive autoblocks for " . $this->mAddress . "\n");
 433
 434                         $row = $dbr->selectRow( 'recentchanges', array( 'rc_ip' ), array( 'rc_user_text' => $this->mAddress ),
 435                                 __METHOD__ , array( 'ORDER BY' => 'rc_timestamp DESC' ) );
 436
 437                         if ( !$row || !$row->rc_ip ) {
 438                                 #No results, don't autoblock anything
 439                                 wfDebug("No IP found to retroactively autoblock\n");
 440                         } else {
 441                                 #Limit is 1, so no loop needed.
 442                                 $retroblockip = $row->rc_ip;
 443                                 return $this->doAutoblock( $retroblockip, true );
 444                         }
 445                 }
 446         }
 447
 448         /**
 449         * Autoblocks the given IP, referring to this Block.
 450         * @param string $autoblockip The IP to autoblock.
 451         * @param bool $justInserted The main block was just inserted
 452         * @return bool Whether or not an autoblock was inserted.
 453         */
 454         function doAutoblock( $autoblockip, $justInserted = false ) {
 455                 # If autoblocks are disabled, go away.
 456                 if ( !$this->mEnableAutoblock ) {
 457                         return;
 458                 }
 459
 460                 # Check for presence on the autoblock whitelist
 461                 # TODO cache this?
 462                 $lines = explode( "\n", wfMsgForContentNoTrans( 'autoblock_whitelist' ) );
 463
 464                 $ip = $autoblockip;
 465
 466                 wfDebug("Checking the autoblock whitelist..\n");
 467
 468                 foreach( $lines as $line ) {
 469                         # List items only
 470                         if ( substr( $line, 0, 1 ) !== '*' ) {
 471                                 continue;
 472                         }
 473
 474                         $wlEntry = substr($line, 1);
 475                         $wlEntry = trim($wlEntry);
 476
 477                         wfDebug("Checking $ip against $wlEntry...");
 478
 479                         # Is the IP in this range?
 480                         if (IP::isInRange( $ip, $wlEntry )) {
 481                                 wfDebug(" IP $ip matches $wlEntry, not autoblocking\n");
 482                                 #$autoblockip = null; # Don't autoblock a whitelisted IP.
 483                                 return; #This /SHOULD/ introduce a dummy block - but
 484                                         # I don't know a safe way to do so. -werdna
 485                         } else {
 486                                 wfDebug( " No match\n" );
 487                         }
 488                 }
 489
 490                 # It's okay to autoblock. Go ahead and create/insert the block.
 491
 492                 $ipblock = Block::newFromDB( $autoblockip );
 493                 if ( $ipblock ) {
 494                         # If the user is already blocked. Then check if the autoblock would
 495                         # exceed the user block. If it would exceed, then do nothing, else
 496                         # prolong block time
 497                         if ($this->mExpiry &&
 498                         ($this->mExpiry < Block::getAutoblockExpiry($ipblock->mTimestamp))) {
 499                                 return;
 500                         }
 501                         # Just update the timestamp
 502                         if ( !$justInserted ) {
 503                                 $ipblock->updateTimestamp();
 504                         }
 505                         return;
 506                 } else {
 507                         $ipblock = new Block;
 508                 }
 509
 510                 # Make a new block object with the desired properties
 511                 wfDebug( "Autoblocking {$this->mAddress}@" . $autoblockip . "\n" );
 512                 $ipblock->mAddress = $autoblockip;
 513                 $ipblock->mUser = 0;
 514                 $ipblock->mBy = $this->mBy;
 515                 $ipblock->mReason = wfMsgForContent( 'autoblocker', $this->mAddress, $this->mReason );
 516                 $ipblock->mTimestamp = wfTimestampNow();
 517                 $ipblock->mAuto = 1;
 518                 $ipblock->mCreateAccount = $this->mCreateAccount;
 519                 # Continue suppressing the name if needed
 520                 $ipblock->mHideName = $this->mHideName;
 521
 522                 # If the user is already blocked with an expiry date, we don't
 523                 # want to pile on top of that!
 524                 if($this->mExpiry) {
 525                         $ipblock->mExpiry = min ( $this->mExpiry, Block::getAutoblockExpiry( $this->mTimestamp ));
 526                 } else {
 527                         $ipblock->mExpiry = Block::getAutoblockExpiry( $this->mTimestamp );
 528                 }
 529                 # Insert it
 530                 return $ipblock->insert();
 531         }
 532
 533         function deleteIfExpired()
 534         {
 535                 $fname = 'Block::deleteIfExpired';
 536                 wfProfileIn( $fname );
 537                 if ( $this->isExpired() ) {
 538                         wfDebug( "Block::deleteIfExpired() -- deleting\n" );
 539                         $this->delete();
 540                         $retVal = true;
 541                 } else {
 542                         wfDebug( "Block::deleteIfExpired() -- not expired\n" );
 543                         $retVal = false;
 544                 }
 545                 wfProfileOut( $fname );
 546                 return $retVal;
 547         }
 548
 549         function isExpired()
 550         {
 551                 wfDebug( "Block::isExpired() checking current " . wfTimestampNow() . " vs $this->mExpiry\n" );
 552                 if ( !$this->mExpiry ) {
 553                         return false;
 554                 } else {
 555                         return wfTimestampNow() > $this->mExpiry;
 556                 }
 557         }
 558
 559         function isValid()
 560         {
 561                 return $this->mAddress != '';
 562         }
 563
 564         function updateTimestamp()
 565         {
 566                 if ( $this->mAuto ) {
 567                         $this->mTimestamp = wfTimestamp();
 568                         $this->mExpiry = Block::getAutoblockExpiry( $this->mTimestamp );
 569
 570                         $dbw = wfGetDB( DB_MASTER );
 571                         $dbw->update( 'ipblocks',
 572                                 array( /* SET */
 573                                         'ipb_timestamp' => $dbw->timestamp($this->mTimestamp),
 574                                         'ipb_expiry' => $dbw->timestamp($this->mExpiry),
 575                                 ), array( /* WHERE */
 576                                         'ipb_address' => $this->mAddress
 577                                 ), 'Block::updateTimestamp'
 578                         );
 579                 }
 580         }
 581
 582         /*
 583         function getIntegerAddr()
 584         {
 585                 return $this->mIntegerAddr;
 586         }
 587
 588         function getNetworkBits()
 589         {
 590                 return $this->mNetworkBits;
 591         }*/
 592
 593         /**
 594          * @return The blocker user ID.
 595          */
 596         public function getBy() {
 597                 return $this->mBy;
 598         }
 599
 600         /**
 601          * @return The blocker user name.
 602          */
 603         function getByName()
 604         {
 605                 return $this->mByName;
 606         }
 607
 608         function forUpdate( $x = NULL ) {
 609                 return wfSetVar( $this->mForUpdate, $x );
 610         }
 611
 612         function fromMaster( $x = NULL ) {
 613                 return wfSetVar( $this->mFromMaster, $x );
 614         }
 615
 616         function getRedactedName() {
 617                 if ( $this->mAuto ) {
 618                         return '#' . $this->mId;
 619                 } else {
 620                         return $this->mAddress;
 621                 }
 622         }
 623
 624         /**
 625          * Encode expiry for DB
 626          */
 627         static function encodeExpiry( $expiry, $db ) {
 628                 if ( $expiry == '' || $expiry == Block::infinity() ) {
 629                         return Block::infinity();
 630                 } else {
 631                         return $db->timestamp( $expiry );
 632                 }
 633         }
 634
 635         /**
 636          * Decode expiry which has come from the DB
 637          */
 638         static function decodeExpiry( $expiry, $timestampType = TS_MW ) {
 639                 if ( $expiry == '' || $expiry == Block::infinity() ) {
 640                         return Block::infinity();
 641                 } else {
 642                         return wfTimestamp( $timestampType, $expiry );
 643                 }
 644         }
 645
 646         static function getAutoblockExpiry( $timestamp )
 647         {
 648                 global $wgAutoblockExpiry;
 649                 return wfTimestamp( TS_MW, wfTimestamp( TS_UNIX, $timestamp ) + $wgAutoblockExpiry );
 650         }
 651
 652         /**
 653          * Gets rid of uneeded numbers in quad-dotted/octet IP strings
 654          * For example, 127.111.113.151/24 -> 127.111.113.0/24
 655          */
 656         static function normaliseRange( $range ) {
 657                 $parts = explode( '/', $range );
 658                 if ( count( $parts ) == 2 ) {
 659                         // IPv6
 660                         if ( IP::isIPv6($range) && $parts[1] >= 64 && $parts[1] <= 128 ) {
 661                                 $bits = $parts[1];
 662                                 $ipint = IP::toUnsigned6( $parts[0] );
 663                                 # Native 32 bit functions WONT work here!!!
 664                                 # Convert to a padded binary number
 665                                 $network = wfBaseConvert( $ipint, 10, 2, 128 );
 666                                 # Truncate the last (128-$bits) bits and replace them with zeros
 667                                 $network = str_pad( substr( $network, 0, $bits ), 128, 0, STR_PAD_RIGHT );
 668                                 # Convert back to an integer
 669                                 $network = wfBaseConvert( $network, 2, 10 );
 670                                 # Reform octet address
 671                                 $newip = IP::toOctet( $network );
 672                                 $range = "$newip/{$parts[1]}";
 673                         } // IPv4
 674                         else if ( IP::isIPv4($range) && $parts[1] >= 16 && $parts[1] <= 32 ) {
 675                                 $shift = 32 - $parts[1];
 676                                 $ipint = IP::toUnsigned( $parts[0] );
 677                                 $ipint = $ipint >> $shift << $shift;
 678                                 $newip = long2ip( $ipint );
 679                                 $range = "$newip/{$parts[1]}";
 680                         }
 681                 }
 682                 return $range;
 683         }
 684
 685         /**
 686          * Purge expired blocks from the ipblocks table
 687          */
 688         static function purgeExpired() {
 689                 $dbw = wfGetDB( DB_MASTER );
 690                 $dbw->delete( 'ipblocks', array( 'ipb_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ), __METHOD__ );
 691         }
 692
 693         static function infinity() {
 694                 # This is a special keyword for timestamps in PostgreSQL, and
 695                 # works with CHAR(14) as well because "i" sorts after all numbers.
 696                 return 'infinity';
 697
 698                 /*
 699                 static $infinity;
 700                 if ( !isset( $infinity ) ) {
 701                         $dbr = wfGetDB( DB_SLAVE );
 702                         $infinity = $dbr->bigTimestamp();
 703                 }
 704                 return $infinity;
 705                  */
 706         }
 707
 708 }