ProxyTools.php

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<?php
function wfGetForwardedFor() {
        wfDeprecated( __METHOD__, '1.19' );
        global $wgRequest;
        return $wgRequest->getHeader( 'X-Forwarded-For' );
}

function wfGetAgent() {
        wfDeprecated( __METHOD__, '1.18' );
        global $wgRequest;
        return $wgRequest->getHeader( 'User-Agent' );
}

function wfGetIP() {
        wfDeprecated( __METHOD__, '1.19' );
        global $wgRequest;
        return $wgRequest->getIP();
}

function wfIsTrustedProxy( $ip ) {
        $trusted = wfIsConfiguredProxy( $ip );
        wfRunHooks( 'IsTrustedProxy', array( &$ip, &$trusted ) );
        return $trusted;
}

function wfIsConfiguredProxy( $ip ) {
        global $wgSquidServers, $wgSquidServersNoPurge;
        $trusted = in_array( $ip, $wgSquidServers ) ||
                in_array( $ip, $wgSquidServersNoPurge );
        return $trusted;
}

function wfProxyCheck() {
        global $wgBlockOpenProxies, $wgProxyPorts, $wgProxyScriptPath;
        global $wgMemc, $wgProxyMemcExpiry, $wgRequest;
        global $wgProxyKey;

        if ( !$wgBlockOpenProxies ) {
                return;
        }

        $ip = $wgRequest->getIP();

        # Get MemCached key
        $mcKey = wfMemcKey( 'proxy', 'ip', $ip );
        $mcValue = $wgMemc->get( $mcKey );
        $skip = (bool)$mcValue;

        # Fork the processes
        if ( !$skip ) {
                $title = SpecialPage::getTitleFor( 'Blockme' );
                $iphash = md5( $ip . $wgProxyKey );
                $url = wfExpandUrl( $title->getFullURL( 'ip=' . $iphash ), PROTO_HTTP );

                foreach ( $wgProxyPorts as $port ) {
                        $params = implode( ' ', array(
                                                escapeshellarg( $wgProxyScriptPath ),
                                                escapeshellarg( $ip ),
                                                escapeshellarg( $port ),
                                                escapeshellarg( $url )
                                                ));
                        exec( "php $params >" . wfGetNull() . " 2>&1 &" );
                }
                # Set MemCached key
                $wgMemc->set( $mcKey, 1, $wgProxyMemcExpiry );
        }
}