Learning C Network Programming

Learn C network programming with these examples.

Examples

Wuts My Ip

Usage

On host

gcc wuts_my_ip.c -o server
./server

On remote client (that's on the same network as the host). Connect to the server on the host using telnet and the host's private ip address. The 9666 port is hardcoded in the code example.

telnet 192.168.128.xxx 9666
> Listen to John Coltrane... By the way, your ip address is: 192.168.128.237

How It Works

Learn how this works by reading the prodigiously documented source code

Minimal HTTP Web Server

Usage

On host

gcc minimal_web_server.c -o server
sudo ./server

Now visit 127.0.0.1 on the browser and you should see this simple html page returned by the browser.

How It Works

Learn how this works by reading the prodigiously documented source code

References

Hacking by Jon Erickson: http://www.amazon.com/Hacking-Art-Exploitation-Jon-Erickson/dp/1593271441

Beej's intro to network programming: http://beej.us/guide/bgnet/output/html/multipage/index.html

opengroup.org socket.h documentation: http://pubs.opengroup.org/onlinepubs/009695399/basedefs/sys/socket.h.html

opengroup.org arpa/inet.h documentation: http://pubs.opengroup.org/onlinepubs/009695399/basedefs/arpa/inet.h.html

opengroup.org net/inet.h documentation: http://pubs.opengroup.org/onlinepubs/009695399/basedefs/arpa/inet.h.html

Contributing

Pull requests more than welcome. Especially if there are bugs, better ways to code things, better ways to explain things.

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request