Packet filtering
 

I want to create a program in C which it will be able to packet tcp/udp packets. Any steps i should follow to solve this problem? I have a few socket programming experience using the api from the writer of the book, i bought for the lesson "Networks & Internet". Thank you

Re: Packet filtering
 

http://sourceforge.net
Search for "firewall", one of the most common packet filtering applications and see what kind of things they do.

You didn't mention your OS/Compiler.

Re: Packet filtering
 

i m using the extension of NetBeans for the C language in Linux. do'nt you know anything else to read except from firewalls?

Re: Packet filtering
 

What are you trying to accomplish? Why are you writing your own? Linux has great support for packet filtering built in - you can do most anything that you'd need with iptables.

Re: Packet filtering
 

its for a university project.an extra assignment and the professor doesnt give us any help.a few students took this assignment and i want to do it.

Re: Packet filtering
 

Are you trying to filter which packets actually make it to the application layer? Or do you only need to listen in and echo those that meet certain criteria?

Re: Packet filtering
 

basically im very confused. i want to filter out those packets which are for voip. it has a certain hexadecimal code.i cant remember it now.

Re: Packet filtering
 

Re: Packet filtering
 

anyone who knows socket programming from the scratch to help?

Re: Packet filtering
 

> anyone who knows socket programming from the scratch to help?
What do you actually want from us?

How about this
http://www.beej.us/guide/bgnet/