Re: Adding new NSE discovered targets to Nmap

[David Fifield <david () bamsoftware com>]

On Sun, Aug 15, 2010 at 07:00:25PM -0700, Fyodor wrote:
> On Fri, Aug 13, 2010 at 06:22:31PM +0200, Patrik Karlsson wrote:
> > > nsp_new() is called for NSE in nse_nsock.cc in luaopen_nsock(). To
> > > enable broadcast, a call to nsp_setbroadcast() must be made after that
> > > call.
> >
> > I guess this is not currently possible and would require an
> > additional function (eg: setbroadcast in nse_nsock.cc) accessible to
> > NSE Lua right?
>
> If we find proof that it is useful, we can probably just enable this
> for all NSE sockets.  I think Nmap already sets the broadcast flag for
> it's connect()-based host discovery and port scanning, and Ncat now
> does this too (Ncat uses the nsp_setbraodcast() function mentioned by
> Daniel).  So if setting this enables a useful script to work, and we
> don't identify any problems with using the flag, then we might just
> set it in all cases rather than provide it as an optional function.

I tested this for receiving broadcasts; receiving works with or without
nsp_setbroadcast on Linux. What prevents it from working is connecting
the socket (even "connecting" the UDP socket to 0.0.0.0). I commented
out the connect call in nsock_connect_internal for these tests.

David Fifield
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