linux-kernel - [RFC] netconsole.txt: "nc" needs "-p" to specify the listening port

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Message-Id: <kernel-nc-hints@mdm.bga.com>
Date:	Sun, 29 Jul 2012 03:40:04 -0500
From:	Milton Miller <miltonm@....com>
To:	Dirk Gouders <gouders@...bocholt.fh-gelsenkirchen.de>
Cc:	Borislav Petkov <bp@...en8.de>,
	Cong Wang <xiyou.wangcong@...il.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Rob Landley <rob@...dley.net>
Subject: [RFC] netconsole.txt: "nc" needs "-p" to specify the listening port

[adding Rob as Doc maintanier]

On Sat, 28 Jul 2012 about 11:08:16 -0000, Dirk Gouders wrote:
> Borislav Petkov <bp@...en8.de> writes:
> 
> > On Fri, Jul 27, 2012 at 11:24:53AM +0200, Dirk Gouders wrote:
> >> Cong Wang <xiyou.wangcong@...il.com> writes:
> >> 
> >> > On Fri, Jul 27, 2012 at 2:35 PM, Dirk Gouders
> >> > <gouders@...bocholt.fh-gelsenkirchen.de> wrote:
> >> >> Hi Jesse,
> >> >>
> >> >> I would like to ask you to check if the documentation of "nc" in
> >> >> netconsole.txt is still correct.  I tried two different netcat packages
> >> >> and both require "-p" to specify the listening port.  I am wondering if
> >> >> that changed after the use of "nc" has been documented.
> >> >
> >> > On Fedora 16, `nc -u -l <port number>` works fine.
> >> 
> >> Thanks for checking that.
> >> 
> >> If the information I found is correct, Fedora uses OpenBSD's nc
> >> codebase.  The two netcat packages I tested on a Gentoo system differ in
> >> requiring the -p switch for the port specification.
> >
> > So say exactly that in the doc: that the *BSD's version of nc doesn't
> > need the port number specified with '-p' and you're covered.
> OK, I tried that in the attached patch.
> I'm not sure if every exeption needs to/should be documented, though.
> 
> >From 3cdeac3e814471053129145c5fa8391acb365fd8 Mon Sep 17 00:00:00 2001
> From: Dirk Gouders <gouders@...bocholt.fh-gelsenkirchen.de>
> Date: Sat, 28 Jul 2012 12:32:49 +0200
> Subject: [PATCH] netconsole.txt: non-BSD versions of nc(1) require '-p'
>  switch
> 
> Gentoo for example uses non-BSD versions of nc(1) which require
> the '-p' switch to specify the listening port.
> 
> ---
> Documentation/networking/netconsole.txt |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
> 
> diff --git a/Documentation/networking/netconsole.txt b/Documentation/networking/netconsole.txt
> index 8d02207..9a362f8 100644
> --- a/Documentation/networking/netconsole.txt
> +++ b/Documentation/networking/netconsole.txt
> @@ -52,7 +52,8 @@ initialized and attempts to bring up the supplied dev at the supplied
>  address.
>  
>  The remote host can run either 'netcat -u -l -p <port>',

So the above line shows usage with -p

> -'nc -l -u <port>' or syslogd.
> +'nc -l -u <port>' (BSD version of nc(1) e.g. Fedora),

now you add a comment about BSD and say Fedora which is not obviously
BSD (this is Documentation; reading the git history for clarification
is not approprate).

> +'nc -l -u -p <port>' or syslogd.

And now you add the original -p which you probably skipped over
since it was on the previous line?


>  
>  Dynamic reconfiguration:
>  ========================

milton
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