Re: ncat: Listen Plus Exec Equals Keep-Open

[David Fifield <david () bamsoftware com>]

On Tue, Apr 06, 2010 at 10:40:06PM -0700, David Millis wrote:
> > Okay, I can see your point. Changing the behavior is easy technically:
> > just change netrun to netexec in ncat_listen.c. It's would break
> > backwards compatibility with option syntax, though.
>
> > We had a similar situation with normal listen mode. The -k option was
> > added fairly recently. Before that, the default was to keep listening
> > always.
>
> > http://seclists.org/nmap-dev/2009/q2/620
>
> > Does anyone have thoughts on making a one-connection mode the default
> > for --exec, and using -k --exec for the current inetd-like behavior?
>
> I'm all for it of course. But then that's how I interpreted ncat
> already worked from the help. :)
>
> Thanks for the 5.3b1 release which fixed the other problems I had. Now
> I can at least pass unidirectional messages via piping/redirection
> without intermittent fails. If -l & -e were one-shot without the -k,
> scripts could be more robust/streamlined with bidirectional
> conversation, a success/fail return message for instance, or
> query/response exchanges.

This is finally implemented. Now, --exec and --sh-exec accept just one
connection and then quit. Use --keep-open for the previous inetd-like
behavior.

David Fifield
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