Re: Nmap doesn't register signal handlers

["Luis M." <luis.mgarc () gmail com>]

ithilgore wrote:
> Hello.
>
> While experimenting with signal handlers in Ncrack, I noticed that Nmap never
> registers the sigdie() handler. This is caused, because there is no check in the
> configure.ac for the signal function, and thus HAVE_SIGNAL stays always
> undefined. You can see that the signal handler doesn't work, because no message
> is printed whenever you press Ctrl+C to stop Nmap from continuing. Normally,
> something like "caught SIGNAL <signame>, cleaning up" should be printed,
> according to sigdie():
>   


Hi Ithilgore,

David and I were discussing the exact same issue yesterday.  You can
change nmap's source to handle HAVE_SIGNAL properly. Here is what David
told me:



David Fifield wrote:
> On Tue, Aug 11, 2009 at 06:17:05PM +0100, Luis M. wrote:
>   
> > By the way. I included the HAVE_SIGNAL check because that's what nmap
> > does. However, Nmap also doesn't include the check in its configure
> > script so the line signal(SIGSEGV, sigdie) in nmap.cc never gets
> > compiled. Do you think I should add the test to nmap's configure.ac?
> >     
>
> Yes, please do that. Send a note to nmap-dev saying what you did because
> that code has probably been disabled for a long time and enabling it
> might have unexpected consequences.
>
> You can do the check in a simpler way:
>
> AC_CHECK_FUNCS([signal])
>
> David Fifield
>
>   

Regards,

Luis.


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