Re: [PATCH] [Ncat] Fix EOF handling

[Daniel Roethlisberger <daniel () roe ch>]

Kris Katterjohn <katterjohn () gmail com> 2009-06-07:
> David Fifield wrote:
> > That's a good idea. In
> > svn://svn.insecure.org/nmap-exp/david/nmap-listen I added
> > -k/--keep-open like you suggested. -k doesn't conflict with
> > any nc or GNU Netcat options. However, I see that a Windows
> > version of Netcat uses -L ("listen harder") for much the same
> > feature.
> >
> > http://osdir.com/ml/os.apple.macports.user/2007-07/msg00072.html
> >
> > There was a request for -L in Ncat, and Kris pointed out that
> > -l already does that.
> >
> > http://seclists.org/nmap-dev/2009/q1/0037.html
> >
> > But because persistent connections cause some programs to
> > lose the tail end of transfers, we're thinking of making
> > non-persistent the default. I think the ncat-listen branch
> > does what we need, but it remains to choose the user
> > interface. I like -k/--keep-open, but -L (and maybe
> > --Listen?) has the benefit of a precedent. Does anyone have a
> > preference?
>
> I'm confused: Daniel said in his initial post that the -k
> option in his patch is like the same option from BSD netcat.
> So -k has precedent too, right?

Correct, Eric Jackson's netcat, part of the FreeBSD and OpenBSD
base systems, has the -k option:

http://www.freebsd.org/cgi/man.cgi?query=nc
http://www.openbsd.org/cgi-bin/man.cgi?query=nc

> But either way, I prefer -k to -L.

-- 
Daniel Roethlisberger
http://daniel.roe.ch/

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