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|
<?php
/**
* Blocks and bans object
*/
/**
* The block class
* All the functions in this class assume the object is either explicitly
* loaded or filled. It is not load-on-demand. There are no accessors.
*
* Globals used: $wgAutoblockExpiry, $wgAntiLockFlags
*
* @todo This could be used everywhere, but it isn't.
*/
class Block
{
/* public*/ var $mAddress, $mUser, $mBy, $mReason, $mTimestamp, $mAuto, $mId, $mExpiry,
$mRangeStart, $mRangeEnd, $mAnonOnly, $mEnableAutoblock, $mHideName;
/* private */ var $mNetworkBits, $mIntegerAddr, $mForUpdate, $mFromMaster, $mByName;
const EB_KEEP_EXPIRED = 1;
const EB_FOR_UPDATE = 2;
const EB_RANGE_ONLY = 4;
function __construct( $address = '', $user = 0, $by = 0, $reason = '',
$timestamp = '' , $auto = 0, $expiry = '', $anonOnly = 0, $createAccount = 0, $enableAutoblock = 0,
$hideName = 0 )
{
$this->mId = 0;
# Expand valid IPv6 addresses
$address = IP::sanitizeIP( $address );
$this->mAddress = $address;
$this->mUser = $user;
$this->mBy = $by;
$this->mReason = $reason;
$this->mTimestamp = wfTimestamp(TS_MW,$timestamp);
$this->mAuto = $auto;
$this->mAnonOnly = $anonOnly;
$this->mCreateAccount = $createAccount;
$this->mExpiry = self::decodeExpiry( $expiry );
$this->mEnableAutoblock = $enableAutoblock;
$this->mHideName = $hideName;
$this->mForUpdate = false;
$this->mFromMaster = false;
$this->mByName = false;
$this->initialiseRange();
}
static function newFromDB( $address, $user = 0, $killExpired = true )
{
$block = new Block();
$block->load( $address, $user, $killExpired );
if ( $block->isValid() ) {
return $block;
} else {
return null;
}
}
static function newFromID( $id )
{
$dbr = wfGetDB( DB_SLAVE );
$res = $dbr->resultObject( $dbr->select( 'ipblocks', '*',
array( 'ipb_id' => $id ), __METHOD__ ) );
$block = new Block;
if ( $block->loadFromResult( $res ) ) {
return $block;
} else {
return null;
}
}
function clear()
{
$this->mAddress = $this->mReason = $this->mTimestamp = '';
$this->mId = $this->mAnonOnly = $this->mCreateAccount =
$this->mEnableAutoblock = $this->mAuto = $this->mUser =
$this->mBy = $this->mHideName = 0;
$this->mByName = false;
}
/**
* Get the DB object and set the reference parameter to the query options
*/
function &getDBOptions( &$options )
{
global $wgAntiLockFlags;
if ( $this->mForUpdate || $this->mFromMaster ) {
$db = wfGetDB( DB_MASTER );
if ( !$this->mForUpdate || ($wgAntiLockFlags & ALF_NO_BLOCK_LOCK) ) {
$options = array();
} else {
$options = array( 'FOR UPDATE' );
}
} else {
$db = wfGetDB( DB_SLAVE );
$options = array();
}
return $db;
}
/**
* Get a ban from the DB, with either the given address or the given username
*
* @param string $address The IP address of the user, or blank to skip IP blocks
* @param integer $user The user ID, or zero for anonymous users
* @param bool $killExpired Whether to delete expired rows while loading
*
*/
function load( $address = '', $user = 0, $killExpired = true )
{
wfDebug( "Block::load: '$address', '$user', $killExpired\n" );
$options = array();
$db =& $this->getDBOptions( $options );
if ( 0 == $user && $address == '' ) {
# Invalid user specification, not blocked
$this->clear();
return false;
}
# Try user block
if ( $user ) {
$res = $db->resultObject( $db->select( 'ipblocks', '*', array( 'ipb_user' => $user ),
__METHOD__, $options ) );
if ( $this->loadFromResult( $res, $killExpired ) ) {
return true;
}
}
# Try IP block
# TODO: improve performance by merging this query with the autoblock one
# Slightly tricky while handling killExpired as well
if ( $address ) {
$conds = array( 'ipb_address' => $address, 'ipb_auto' => 0 );
$res = $db->resultObject( $db->select( 'ipblocks', '*', $conds, __METHOD__, $options ) );
if ( $this->loadFromResult( $res, $killExpired ) ) {
if ( $user && $this->mAnonOnly ) {
# Block is marked anon-only
# Whitelist this IP address against autoblocks and range blocks
$this->clear();
return false;
} else {
return true;
}
}
}
# Try range block
if ( $this->loadRange( $address, $killExpired, $user ) ) {
if ( $user && $this->mAnonOnly ) {
$this->clear();
return false;
} else {
return true;
}
}
# Try autoblock
if ( $address ) {
$conds = array( 'ipb_address' => $address, 'ipb_auto' => 1 );
if ( $user ) {
$conds['ipb_anon_only'] = 0;
}
$res = $db->resultObject( $db->select( 'ipblocks', '*', $conds, __METHOD__, $options ) );
if ( $this->loadFromResult( $res, $killExpired ) ) {
return true;
}
}
# Give up
$this->clear();
return false;
}
/**
* Fill in member variables from a result wrapper
*/
function loadFromResult( ResultWrapper $res, $killExpired = true )
{
$ret = false;
if ( 0 != $res->numRows() ) {
# Get first block
$row = $res->fetchObject();
$this->initFromRow( $row );
if ( $killExpired ) {
# If requested, delete expired rows
do {
$killed = $this->deleteIfExpired();
if ( $killed ) {
$row = $res->fetchObject();
if ( $row ) {
$this->initFromRow( $row );
}
}
} while ( $killed && $row );
# If there were any left after the killing finished, return true
if ( $row ) {
$ret = true;
}
} else {
$ret = true;
}
}
$res->free();
return $ret;
}
/**
* Search the database for any range blocks matching the given address, and
* load the row if one is found.
*/
function loadRange( $address, $killExpired = true, $user = 0 )
{
$iaddr = IP::toHex( $address );
if ( $iaddr === false ) {
# Invalid address
return false;
}
# Only scan ranges which start in this /16, this improves search speed
# Blocks should not cross a /16 boundary.
$range = substr( $iaddr, 0, 4 );
$options = array();
$db =& $this->getDBOptions( $options );
$conds = array(
"ipb_range_start LIKE '$range%'",
"ipb_range_start <= '$iaddr'",
"ipb_range_end >= '$iaddr'"
);
if ( $user ) {
$conds['ipb_anon_only'] = 0;
}
$res = $db->resultObject( $db->select( 'ipblocks', '*', $conds, __METHOD__, $options ) );
$success = $this->loadFromResult( $res, $killExpired );
return $success;
}
/**
* Determine if a given integer IPv4 address is in a given CIDR network
* @deprecated Use IP::isInRange
*/
function isAddressInRange( $addr, $range ) {
return IP::isInRange( $addr, $range );
}
function initFromRow( $row )
{
$this->mAddress = $row->ipb_address;
$this->mReason = $row->ipb_reason;
$this->mTimestamp = wfTimestamp(TS_MW,$row->ipb_timestamp);
$this->mUser = $row->ipb_user;
$this->mBy = $row->ipb_by;
$this->mAuto = $row->ipb_auto;
$this->mAnonOnly = $row->ipb_anon_only;
$this->mCreateAccount = $row->ipb_create_account;
$this->mEnableAutoblock = $row->ipb_enable_autoblock;
$this->mHideName = $row->ipb_deleted;
$this->mId = $row->ipb_id;
$this->mExpiry = self::decodeExpiry( $row->ipb_expiry );
if ( isset( $row->user_name ) ) {
$this->mByName = $row->user_name;
} else {
$this->mByName = false;
}
$this->mRangeStart = $row->ipb_range_start;
$this->mRangeEnd = $row->ipb_range_end;
}
function initialiseRange()
{
$this->mRangeStart = '';
$this->mRangeEnd = '';
if ( $this->mUser == 0 ) {
list( $this->mRangeStart, $this->mRangeEnd ) = IP::parseRange( $this->mAddress );
}
}
/**
* Callback with a Block object for every block
* @return integer number of blocks;
*/
/*static*/ function enumBlocks( $callback, $tag, $flags = 0 )
{
global $wgAntiLockFlags;
$block = new Block();
if ( $flags & Block::EB_FOR_UPDATE ) {
$db = wfGetDB( DB_MASTER );
if ( $wgAntiLockFlags & ALF_NO_BLOCK_LOCK ) {
$options = '';
} else {
$options = 'FOR UPDATE';
}
$block->forUpdate( true );
} else {
$db = wfGetDB( DB_SLAVE );
$options = '';
}
if ( $flags & Block::EB_RANGE_ONLY ) {
$cond = " AND ipb_range_start <> ''";
} else {
$cond = '';
}
$now = wfTimestampNow();
list( $ipblocks, $user ) = $db->tableNamesN( 'ipblocks', 'user' );
$sql = "SELECT $ipblocks.*,user_name FROM $ipblocks,$user " .
"WHERE user_id=ipb_by $cond ORDER BY ipb_timestamp DESC $options";
$res = $db->query( $sql, 'Block::enumBlocks' );
$num_rows = $db->numRows( $res );
while ( $row = $db->fetchObject( $res ) ) {
$block->initFromRow( $row );
if ( ( $flags & Block::EB_RANGE_ONLY ) && $block->mRangeStart == '' ) {
continue;
}
if ( !( $flags & Block::EB_KEEP_EXPIRED ) ) {
if ( $block->mExpiry && $now > $block->mExpiry ) {
$block->delete();
} else {
call_user_func( $callback, $block, $tag );
}
} else {
call_user_func( $callback, $block, $tag );
}
}
$db->freeResult( $res );
return $num_rows;
}
function delete()
{
if (wfReadOnly()) {
return false;
}
if ( !$this->mId ) {
throw new MWException( "Block::delete() now requires that the mId member be filled\n" );
}
$dbw = wfGetDB( DB_MASTER );
$dbw->delete( 'ipblocks', array( 'ipb_id' => $this->mId ), __METHOD__ );
return $dbw->affectedRows() > 0;
}
/**
* Insert a block into the block table.
*@return Whether or not the insertion was successful.
*/
function insert()
{
wfDebug( "Block::insert; timestamp {$this->mTimestamp}\n" );
$dbw = wfGetDB( DB_MASTER );
# Unset ipb_anon_only for user blocks, makes no sense
if ( $this->mUser ) {
$this->mAnonOnly = 0;
}
# Unset ipb_enable_autoblock for IP blocks, makes no sense
if ( !$this->mUser ) {
$this->mEnableAutoblock = 0;
}
# Don't collide with expired blocks
Block::purgeExpired();
$ipb_id = $dbw->nextSequenceValue('ipblocks_ipb_id_val');
$dbw->insert( 'ipblocks',
array(
'ipb_id' => $ipb_id,
'ipb_address' => $this->mAddress,
'ipb_user' => $this->mUser,
'ipb_by' => $this->mBy,
'ipb_reason' => $this->mReason,
'ipb_timestamp' => $dbw->timestamp($this->mTimestamp),
'ipb_auto' => $this->mAuto,
'ipb_anon_only' => $this->mAnonOnly,
'ipb_create_account' => $this->mCreateAccount,
'ipb_enable_autoblock' => $this->mEnableAutoblock,
'ipb_expiry' => self::encodeExpiry( $this->mExpiry, $dbw ),
'ipb_range_start' => $this->mRangeStart,
'ipb_range_end' => $this->mRangeEnd,
'ipb_deleted' => $this->mHideName
), 'Block::insert', array( 'IGNORE' )
);
$affected = $dbw->affectedRows();
$dbw->commit();
if ($affected)
$this->doRetroactiveAutoblock();
return $affected;
}
/**
* Retroactively autoblocks the last IP used by the user (if it is a user)
* blocked by this Block.
*@return Whether or not a retroactive autoblock was made.
*/
function doRetroactiveAutoblock() {
$dbr = wfGetDB( DB_SLAVE );
#If autoblock is enabled, autoblock the LAST IP used
# - stolen shamelessly from CheckUser_body.php
if ($this->mEnableAutoblock && $this->mUser) {
wfDebug("Doing retroactive autoblocks for " . $this->mAddress . "\n");
$row = $dbr->selectRow( 'recentchanges', array( 'rc_ip' ), array( 'rc_user_text' => $this->mAddress ),
__METHOD__ , array( 'ORDER BY' => 'rc_timestamp DESC' ) );
if ( !$row || !$row->rc_ip ) {
#No results, don't autoblock anything
wfDebug("No IP found to retroactively autoblock\n");
} else {
#Limit is 1, so no loop needed.
$retroblockip = $row->rc_ip;
return $this->doAutoblock( $retroblockip, true );
}
}
}
/**
* Autoblocks the given IP, referring to this Block.
* @param string $autoblockip The IP to autoblock.
* @param bool $justInserted The main block was just inserted
* @return bool Whether or not an autoblock was inserted.
*/
function doAutoblock( $autoblockip, $justInserted = false ) {
# Check if this IP address is already blocked
$dbw = wfGetDB( DB_MASTER );
# If autoblocks are disabled, go away.
if ( !$this->mEnableAutoblock ) {
return;
}
# Check for presence on the autoblock whitelist
# TODO cache this?
$lines = explode( "\n", wfMsgForContentNoTrans( 'autoblock_whitelist' ) );
$ip = $autoblockip;
wfDebug("Checking the autoblock whitelist..\n");
foreach( $lines as $line ) {
# List items only
if ( substr( $line, 0, 1 ) !== '*' ) {
continue;
}
$wlEntry = substr($line, 1);
$wlEntry = trim($wlEntry);
wfDebug("Checking $ip against $wlEntry...");
# Is the IP in this range?
if (IP::isInRange( $ip, $wlEntry )) {
wfDebug(" IP $ip matches $wlEntry, not autoblocking\n");
#$autoblockip = null; # Don't autoblock a whitelisted IP.
return; #This /SHOULD/ introduce a dummy block - but
# I don't know a safe way to do so. -werdna
} else {
wfDebug( " No match\n" );
}
}
# It's okay to autoblock. Go ahead and create/insert the block.
$ipblock = Block::newFromDB( $autoblockip );
if ( $ipblock ) {
# If the user is already blocked. Then check if the autoblock would
# exceed the user block. If it would exceed, then do nothing, else
# prolong block time
if ($this->mExpiry &&
($this->mExpiry < Block::getAutoblockExpiry($ipblock->mTimestamp))) {
return;
}
# Just update the timestamp
if ( !$justInserted ) {
$ipblock->updateTimestamp();
}
return;
} else {
$ipblock = new Block;
}
# Make a new block object with the desired properties
wfDebug( "Autoblocking {$this->mAddress}@" . $autoblockip . "\n" );
$ipblock->mAddress = $autoblockip;
$ipblock->mUser = 0;
$ipblock->mBy = $this->mBy;
$ipblock->mReason = wfMsgForContent( 'autoblocker', $this->mAddress, $this->mReason );
$ipblock->mTimestamp = wfTimestampNow();
$ipblock->mAuto = 1;
$ipblock->mCreateAccount = $this->mCreateAccount;
# Continue suppressing the name if needed
$ipblock->mHideName = $this->mHideName;
# If the user is already blocked with an expiry date, we don't
# want to pile on top of that!
if($this->mExpiry) {
$ipblock->mExpiry = min ( $this->mExpiry, Block::getAutoblockExpiry( $this->mTimestamp ));
} else {
$ipblock->mExpiry = Block::getAutoblockExpiry( $this->mTimestamp );
}
# Insert it
return $ipblock->insert();
}
function deleteIfExpired()
{
$fname = 'Block::deleteIfExpired';
wfProfileIn( $fname );
if ( $this->isExpired() ) {
wfDebug( "Block::deleteIfExpired() -- deleting\n" );
$this->delete();
$retVal = true;
} else {
wfDebug( "Block::deleteIfExpired() -- not expired\n" );
$retVal = false;
}
wfProfileOut( $fname );
return $retVal;
}
function isExpired()
{
wfDebug( "Block::isExpired() checking current " . wfTimestampNow() . " vs $this->mExpiry\n" );
if ( !$this->mExpiry ) {
return false;
} else {
return wfTimestampNow() > $this->mExpiry;
}
}
function isValid()
{
return $this->mAddress != '';
}
function updateTimestamp()
{
if ( $this->mAuto ) {
$this->mTimestamp = wfTimestamp();
$this->mExpiry = Block::getAutoblockExpiry( $this->mTimestamp );
$dbw = wfGetDB( DB_MASTER );
$dbw->update( 'ipblocks',
array( /* SET */
'ipb_timestamp' => $dbw->timestamp($this->mTimestamp),
'ipb_expiry' => $dbw->timestamp($this->mExpiry),
), array( /* WHERE */
'ipb_address' => $this->mAddress
), 'Block::updateTimestamp'
);
}
}
/*
function getIntegerAddr()
{
return $this->mIntegerAddr;
}
function getNetworkBits()
{
return $this->mNetworkBits;
}*/
/**
* @return The blocker user ID.
*/
public function getBy() {
return $this->mBy;
}
/**
* @return The blocker user name.
*/
function getByName()
{
if ( $this->mByName === false ) {
$this->mByName = User::whoIs( $this->mBy );
}
return $this->mByName;
}
function forUpdate( $x = NULL ) {
return wfSetVar( $this->mForUpdate, $x );
}
function fromMaster( $x = NULL ) {
return wfSetVar( $this->mFromMaster, $x );
}
function getRedactedName() {
if ( $this->mAuto ) {
return '#' . $this->mId;
} else {
return $this->mAddress;
}
}
/**
* Encode expiry for DB
*/
static function encodeExpiry( $expiry, $db ) {
if ( $expiry == '' || $expiry == Block::infinity() ) {
return Block::infinity();
} else {
return $db->timestamp( $expiry );
}
}
/**
* Decode expiry which has come from the DB
*/
static function decodeExpiry( $expiry ) {
if ( $expiry == '' || $expiry == Block::infinity() ) {
return Block::infinity();
} else {
return wfTimestamp( TS_MW, $expiry );
}
}
static function getAutoblockExpiry( $timestamp )
{
global $wgAutoblockExpiry;
return wfTimestamp( TS_MW, wfTimestamp( TS_UNIX, $timestamp ) + $wgAutoblockExpiry );
}
/**
* Gets rid of uneeded numbers in quad-dotted/octet IP strings
* For example, 127.111.113.151/24 -> 127.111.113.0/24
*/
static function normaliseRange( $range ) {
$parts = explode( '/', $range );
if ( count( $parts ) == 2 ) {
// IPv6
if ( IP::isIPv6($range) && $parts[1] >= 64 && $parts[1] <= 128 ) {
$bits = $parts[1];
$ipint = IP::toUnsigned6( $parts[0] );
# Native 32 bit functions WONT work here!!!
# Convert to a padded binary number
$network = wfBaseConvert( $ipint, 10, 2, 128 );
# Truncate the last (128-$bits) bits and replace them with zeros
$network = str_pad( substr( $network, 0, $bits ), 128, 0, STR_PAD_RIGHT );
# Convert back to an integer
$network = wfBaseConvert( $network, 2, 10 );
# Reform octet address
$newip = IP::toOctet( $network );
$range = "$newip/{$parts[1]}";
} // IPv4
else if ( IP::isIPv4($range) && $parts[1] >= 16 && $parts[1] <= 32 ) {
$shift = 32 - $parts[1];
$ipint = IP::toUnsigned( $parts[0] );
$ipint = $ipint >> $shift << $shift;
$newip = long2ip( $ipint );
$range = "$newip/{$parts[1]}";
}
}
return $range;
}
/**
* Purge expired blocks from the ipblocks table
*/
static function purgeExpired() {
$dbw = wfGetDB( DB_MASTER );
$dbw->delete( 'ipblocks', array( 'ipb_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ), __METHOD__ );
}
static function infinity() {
# This is a special keyword for timestamps in PostgreSQL, and
# works with CHAR(14) as well because "i" sorts after all numbers.
return 'infinity';
/*
static $infinity;
if ( !isset( $infinity ) ) {
$dbr = wfGetDB( DB_SLAVE );
$infinity = $dbr->bigTimestamp();
}
return $infinity;
*/
}
}
?>
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