Building your own IP header

Hi Folks,

I am developing a protocol traffic generator. I need to be able to start the traffic with different source address to different destination addresses.

basically I need to costruct my own IP header. I understand one way to do it is using raw sockets. Can someone point me to some links on how to construct your own IP header using raw sockets.

I am developing on Linux with gcc compiler.

Thanks,

You might look at nmaps source, as I believe it does this. I think it only chages the source IP for one option, but I know it uses RAW sockets, and creates the headers itself so it can set the various flags itself. You should still be able to get an idea I would think.

This post: http://cboard.cprogramming.com/showthread.php?t=41926
has many good links, and for a raw sockets guide take a look at the link i incuded there.

goodluck.


p.s: microsoft just killed rawsockets on windows forever with their latest security patch - MS05-019.
http://seclists.org/lists/nmap-hacke...-Jun/0000.html