I am starting to get the hang of creating connections in c using socket(), bind(), listen(), accept() and so on. Both as a server and as a client, send()ing data or recv()ing data.

But now I want to send packets manually, meaning that I want to send for example a TCP SYN packet and then wait for a SYN/ACK, and so on. Doing everything myself. Is there any good guides on how to do this out there?

Of course I want to do it in c-code.

Not sure if this is helpful or not, but I think the whole point of TCP is that you can abstract away the notion of packets and just deal with streams (with guaranteed delivery no less ). If you want to toss that abstraction, there's always UDP (one of the only things UDP packets add to IP datagrams is the notion of port numbers).

Let us know what you end up finding.

not sure what you are up to
anyway take a look at these two articles

Linux Raw Socket Programming - What Lies Beneath a Socket? Part 1

Linux Raw Socket Programming - What Lies Beneath a Socket? Part 2

Hehe, don't know what I am up to? Well I am reading this book on TCP/IP and now I find it dull that I just need to do some system calls and I have a connection. I want to see and send all those packets by myself, setting the ACK-flag manually along with the destination IP and then send it out to cyberspace. I am trying to learn about how TCP/IP works and I want to be able to play with it as I learn.

I will check those two links. See if they are good enough.

EDIT: I have started reading part 1, think I understand now what you ment with "don't know what you're up to".

hehe....don't be naughty....hr........


anyway,not sure whether it works in newer kernel....