Wireless connection through wires....?

I was wondering if there is hardware that can do what I need. I have an XBox 360 and a broadband phone connection. I was wondering if there was hardware that I can use to my ethernet wire comes out of the XBox 360 into a wireless hub and then connects to my wireless router (providing the internet). Also, the broadband phone requires a router, so where the internet goes in via ethernet cable, could I run that to a wireless hub and connects to the wireless router providing internet (same theory as the XBox. Does something like that exist right now?