Re: [NSE] Interface info of raw IPv4 sockets

[Djalal Harouni <tixxdz () opendz org>]

On Wed, Jun 22, 2011 at 04:43:01PM +0200, Gorjan Petrovski wrote:
> > > I suppose a better alternative would be a dnet:get_interface()
> > > function which returns info on the interface of an open IP socket,
> > > since we have no way of specifying which interface the IP socket opens
> > > on. Better yet, an optional argument to the dnet:ip_open(interface),
> > > to let us specify the interface for the IP socket and a fix for the
> > > nmap.get_interface() function.
> > Normally nmap.get_interface() and nmap.get_interface_info() should cover
> > all the situations, at least for the broadcast and pcap stuff, but for
> > dnet I don't know. After a first look it seems that the info
> > (device, and routes, etc) are built during the dnet:ip_send() call.
>
> Well, the way I understand it, if the interface for the raw IP socket
> is the one specified with the -e option then everything's resolved. I
> just have to make the -e option mandatory for the broadcast-ping
> script I'm working on right now.
This should work: "if the interface for the raw IP socket is the
one specified with the -e option then everything's resolved", but you
must test it.

I think that if you get the interface name with nmap.get_interface(),
then the interface info with nmap.get_interface_info(), and you use the
source IP of that interface in your raw packets, then dnet:ip_send()
should use that interface.


Just to note that the targets-sniffer script uses a special script
argument 'targets-sniffer.iface' to get the choosed interface, if it's not
used then it will fallback to nmap.get_interface(). IIRC this was
suggested by David.

-- 
tixxdz
http://opendz.org
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