Re: Google/Nmap SoC 2009 Project Ideas?

[doug () hcsw org]

On Mon, Mar 09, 2009 at 01:45:29PM -0700 or thereabouts, Fyodor wrote:
> So if anyone has an idea for Nmap (including Ndiff, Ncat, or Zenmap),
> please speak up!

Here's a possible task for a feature creeper or bug wrangler:

Make sure that pcap buffering is disabled on systems that do this.

Here are the details about BPF on OpenBSD:

http://seclists.org/nmap-dev/2007/q1/0174.html

And DLPI on Solaris:

http://seclists.org/nmap-dev/2008/q3/0284.html

* I had problems including system header files on OpenBSD because of
  conflicts with Nmap's included bpf.h so you will need a good understanding
  of build systems to solve this. I was thinking you could maybe include
  the system bpf.h file in a separate file that doesn't include Nmap's
  copy and create a wrapper function to disable buffering on a pcap
  descriptor, but there might be a better way. Kris Katterjohn also had
  some ideas about solving this - see the replies to the above message.

* You will have to verify that this actually does improve scan times
  and doesn't cause worse performance. My testing on OpenBSD suggests
  that this always improves (or at least doesn't hurt) performance but
  this might not be the case on slow systems that can benefit from buffering.

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