Re: Nsock new engines

[Kris Katterjohn <katterjohn () gmail com>]

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Hey guys,

(I've been too busy to do much with nmap for a while, so I could be mistaken
on what's going on, but I want to bring something up in case it's relevant).

On 10/25/2012 02:02 PM, Henri Doreau wrote:
> it looks like WSAPoll isn't able to deal with stdin, even though I can't
> find anything in the WSAPoll() documentation that would explain this
> difference of behavior with select().
>
> Does anyone know a way to do it? I unfortunately don't, and couldn't find
> anything that would work for both stdin options (tty, pipes, files) and
> sockets. Since only ncat should be affected there, maybe the patch
> attached (untested) would be an acceptable fix? It enforces the use of
> the select engine on windows when stdin is a tty. Could you please give
> it a try? (also with piping something, like echo, to ncat, and
> redirecting a regular file to ncat' stdin).

It sounds like you're suggesting that select() works for stdin on Windows
but WSAPoll() doesn't.  Is that right?  Although it's gone through some
changes over the years, I originally wrote the fselect()[1] in nbase because
select() doesn't work with stdin on Windows (and I did it for ncat and
nsock).  A simple grep shows that fselect() is called in engine_select.c for
nsock instead of the vanilla select().

If I'm not misunderstanding what you're saying, then I think WSAPoll() and
select() are not that different in their behavior wrt stdin (although I have
no experience with WSAPoll afaik).  I don't have a direct suggestion for a
fix, but I think it's important to note that there's a workaround for
select() and it's not doing "the right thing" with stdin on Windows either.

Cheers,
Kris Katterjohn

[1] http://seclists.org/nmap-dev/2008/q3/766
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