Re: Nmap doesn't register signal handlers

[Fyodor <fyodor () insecure org>]

On Wed, Aug 12, 2009 at 12:52:21AM +0300, ithilgore wrote:
> 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():

Good catch.  Since this hasn't been working for years and we haven't
been hearing complaints, and since our sigdie() is rather questionable
from a reentrancy perspective and needs a complete rewrite if we ever
decide to catch the signals again, I've removed sigdie() and some
other ancient signal cruft (e.g. reaper()).  I also fixed nbase to
properly detect HAVE_SIGNAL as well, since we do still have a few
arguably legitimate uses (like ignoring SIGPIPE and resetting many of
the other handlers to SIG_DFL).

Cheers,
-F

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