htaccess - 拒绝未经授权的域名请求

I have a website "www.mysite.com", and it has an its own ip. Now since few months I see several domains pointing to my ip server (it's not a shared ip). I can navigate thru the entire website with those unauthorized domains, they get indexed in google with my contents and all.I have a website "www.mysite.com", and it has a