Re: nmap Mac OS X Firewire Issue

[David Fifield <david () bamsoftware com>]

On Thu, Jul 16, 2009 at 09:00:38AM -0600, David Fifield wrote:
> On Wed, Jul 15, 2009 at 10:54:34AM -0400, Julian Berdych wrote:
> >   The latest version of nmap (4.90RC1) still craps out on any Mac OS X 
> > system that has FireWire ports (see the nmap output below). This is  
> > pretty serious, as all Macs these days have FireWire ports, even the  
> > low-end MacBooks.
>
> Thanks for reporting this. I was not previously aware of it. It had
> never happened to me on a Mac with FireWire ports. However, I was able
> to reproduce the problem by assigning an IP address to the fw0
> interface. I couldn't do this through System Preferences, I had to use
> ifconfig.
>
> This doesn't happen to me on a Mac with FireWire ports. Does it only
> happen when something is plugged into one of the ports? I tried enabling
> the interface through System Preferences but it says "No network capable
> FireWire devices are connected."

I committed a fix for this in r14448. Now you will just get a warning

Warning: Unable to get hardware address for interface fw0 -- skipping it.

I traced through the execution and found that libdnet gets pretty close
to finding the hardware address--in fact it finds it but its length
doesn't match what it expects for an Ethernet address. I suppose that
the hardware address for a FireWire interface is the "lladdr" I see in
the output of ifconfig.

fw0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 2030
        inet 192.168.3.2 netmask 0xffffff00 broadcast 192.168.3.255
        lladdr 00:1f:5b:ff:fe:0d:73:ae
        media: autoselect <full-duplex> status: inactive
        supported media: autoselect <full-duplex>

Nmap's logic for finding Ethernet devices is a little wrong--it assumes
any interface with the BROADCAST flag is Ethernet.

David Fifield

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