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

[Peter Hessler <[e-mail]>]

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) 


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