DDoS script in c++ to test firewall/Router

I need DOS or DDoS script (source code), written in c/c++ only, i need it to test my firewalls, routers and networks, the script have to work on centos 5. I need the basics attacks like : tcp flood syn flood udp flood should be possible to select the port to use, and the ip spoofing features must be enabled or disabled. Must also use one new methods developed by you, to test the firewall and the router under stress, like http get command for example.