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Re: [Idr] [GROW] draft-snijders-idr-shutdown-00: Drop a line in the peer's syslog at shutdown

"Neil J. McRae" <neil@domino.org> Sat, 19 November 2016 13:51 UTC

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From: "Neil J. McRae" <neil@domino.org>
To: Peter Hessler <phessler@theapt.org>
Thread-Topic: [Idr] [GROW] draft-snijders-idr-shutdown-00: Drop a line in the peer's syslog at shutdown
Thread-Index: AQHSP/9KqJ8HctM7aUO4ZcydBCJgGaDbkwIAgAAM1oCABLgufg==
Date: Sat, 19 Nov 2016 13:51:21 +0000
Message-ID: <FBD63625-3E82-44AC-9318-D6B6DFE86082@domino.org>
References: <20161116061556.GG1073@dhcp-9341.meeting.ietf.org> <20161116105535.GW79185@Space.Net> <1479295774707.77855@dacor.de> <20161116113849.udbrfvdhaj3be7nx@bongo.bofh.it> <20161116130110.GK1073@dhcp-9341.meeting.ietf.org>, <20161116134707.GP24817@gir.theapt.org>
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Cc: "idr@ietf.org" <idr@ietf.org>, "grow@ietf.org" <grow@ietf.org>
Subject: Re: [Idr] [GROW] draft-snijders-idr-shutdown-00: Drop a line in the peer's syslog at shutdown
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I personally think this is a really bad idea but understand why some might want this - and we've had similar drafts in the past- in my view  we shouldn't be moving more towards more human related randomness in system level messages - have a set of status numbers or something that can be predictable but randomly "we took the peer down whilst we went to McDonald's" as opposed to CEASE reason 666 - we depeered or reason 999 we have a problem call us would be a much better approach. We can't keep running networks like we did 20 years ago! 

Thanks
Neil 
Sent from my iPhone

> On 16 Nov 2016, at 13:47, Peter Hessler <phessler@theapt.org> wrote:
> 
> On 2016 Nov 16 (Wed) at 22:01:10 +0900 (+0900), Job Snijders wrote:
> :I hope to capture in the draft that an implementation can choose which
> :characters of the Shutdown Communication they represent in the syslog or
> :'show bgp neighbor xxx' output. For instance, I'd recommend to squash
> :all newline/newpage/newfeed/newparagraph style chars and make sure that
> :the Communication is represented on a single line. I don't have the
> :proper words for the draft to express that (yet).
> 
> I've been thinking about wording for protecting the receiving system
> from possible bad input.  I'm not worried about (valid) UTF-8 display
> chars, nor about whitespace things.  I am worried about Little Bobby
> Tables, though.
> 
> We also have to consider that this will be displayed possibly in a Unix
> Shell, Windows Shell, Syslog, SQL server, Web Server; and different
> chars have different meanings there.
> 
> I'm not quite happy with the wording, but I would like something along
> these lines added.  Possibly in the Security section, or at the end of
> Section #2.
> 
> ====
> Receiving systems SHOULD filter the message for the intended output
> environment and MAY change octets or sequences of octets for their   
> local environment.
> As the message may be displayed on a command line, stored
> in a syslog server, in an SQL database, or even a Web Server different
> outputs MAY happen.
> Sending systems MUST NOT depend on changes to their
> sequences not happening.
> ====
> 
> (Consider, Little Bobby Tables https://www.xkcd.com/327/, printf
> escapes, Javascript/HTML, etc) 
> 
> 
> -- 
> Taxes, n.:
>    Of life's two certainties, the only one for which you can get
>    an extension.
> 
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