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Manipulate the Linux ARP Cache in C


 
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# 15  
Old 08-17-2009
I see - thanks -

I'm a student of network security, and joined the Unix Group on Linkedin in order to learn more about the world of Unix/Linux as it seems a lot of work is done on those opperating systems.

Thanks for your patience.
# 16  
Old 09-26-2009
Hello everybody,

Finally, i came up with how to do it, it's not the way i thought it was going to be, but it works.

The solution is in SIOCxARP. My program's algorithm listens for ARP traffic, and when receives a valid frame, uses SIOCSARP to add an entry to the ARP cache. The kernel does it before, but just in case, this will overwrite it.

When it detects a malicious frame, it uses SIOCDARP to delete the entry previously created by the kernel in the cache, so the ARP attack has no impact over the secured host.

Thank you VERY MUCH for your help, fpmurphy, Corona688.
# 17  
Old 09-26-2009
Hello everybody,

Finally, i came up with how to do it, it's not the way i thought it was going to be, but it works.

The solution is in SIOCxARP. My program's algorithm listens for ARP traffic, and when receives a valid frame, uses SIOCSARP to add an entry to the ARP cache. The kernel does it before, but just in case, this will overwrite it.

When it detects a malicious frame, it uses SIOCDARP to delete the entry previously created by the kernel in the cache, so the ARP attack has no impact over the secured host.

Thank you VERY MUCH for your help, fpmurphy, Corona688.
# 18  
Old 09-28-2009
Smilie Sounds like a fairly portable solution actually.
# 19  
Old 10-01-2009
Semash, glad I was able to help.

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