I cant control my network card.....

**errigour** · 02-24-2009

I am hoping someone here will help me out.
I am trying to make a program that controls
my ethernet card's input and output. I kind of
want to take the control linux has of my eth0
card and eth1 card and use a program that
will controll access. I kind of want to better
understand my network hardware as well.
I prefer to use perl programming. I still don't
quite understand c programming the way you should
to actually make programs worth using. hence my
rpm2cpio ki, a, program I posted for linux users who
didn't know theres a command that extracts your
rpm files into working directories that the rpm would
be extracted into using the rpm -ivh command.
unfortunatly programmers like to keep things confidentual
so some rpm files contain binaries that you would have to
exrtact cause I don't know how to with linux. Anways
Please someone if you coould point me in the right direction
that would help emensly with my self schooling network
programming.

**WuNMOjTIQanXWBcH** · 02-26-2009

Answer:

Originally Posted by linuxrelik

I am trying to make a program that controls my ethernet card's input and output. I kind of want to take the control linux has of my eth0 card and eth1 card and use a program that will controll access. […] Anways
Please someone if you coould point me in the right direction that would help emensly with my self schooling network programming.

These are the solutions I can think of, sorted by awkwardness, descending:

Hack the network driver for your NIC.
- Receiving packets: Use «iptables»¹ in conjunction with the «QUEUE» target and «libipq»². This way you can pass network packets through userspace code and possibly drop them.
- Sending packets: Use the «Raw Socket»³ interface.
Same as in 2., but for sending packets, use one of the many libraries that abstract the «Raw Socket» interface.⁴

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