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Re: [netmod] WG Last Call for draft-ietf-netmod-syslog-model-15

"Clyde Wildes (cwildes)" <cwildes@cisco.com> Tue, 18 July 2017 18:21 UTC

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From: "Clyde Wildes (cwildes)" <cwildes@cisco.com>
To: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>, Alex Campbell <Alex.Campbell@Aviatnet.com>
CC: "netmod@ietf.org" <netmod@ietf.org>
Thread-Topic: [netmod] WG Last Call for draft-ietf-netmod-syslog-model-15
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Date: Tue, 18 Jul 2017 18:20:59 +0000
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References: <91245764-587A-4F9C-B8F4-8A9A7E2BC9BB@juniper.net> <1500333639904.57913@Aviatnet.com> <20170718082635.GA18279@elstar.local>
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Subject: Re: [netmod] WG Last Call for draft-ietf-netmod-syslog-model-15
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Juergen and Alex,

The choice of Posix 1003.2 regular expressions was because of multiple vendors who supported same and asked for model support:
http://www.juniper.net/documentation/en_US/junos12.3/topics/reference/configuration-statement/syslog-edit-system.html
http://www.rsyslog.com/doc/v8-stable/configuration/filters.html
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/esm/command/esm-cr-book/esm-cr-a1.html#wp1888787448
https://infoproducts.alcatel-lucent.com/html/0_add-h-f/93-0071-10-01/7750_SR_OS_System_Management_Guide/Logcli.html#1030840

Posix 1003.2 regular expressions support Unicode characters using the notation: \uFFFF or \x{FFFF}.

I will insert a normative reference to POSIX 1003.2 in the next revision of the draft.

Thanks,

Clyde

On 7/18/17, 1:26 AM, "netmod on behalf of Juergen Schoenwaelder" <netmod-bounces@ietf.org on behalf of j.schoenwaelder@jacobs-university.de> wrote:

    On Mon, Jul 17, 2017 at 11:20:40PM +0000, Alex Campbell wrote:
    > I am considering to implement the data model in this draft. (dependent on business priorities of course)
    > I have reviewed this draft and found the following issues.
    > 
    > * I see pattern-match is specified to use POSIX 1003.2 regular expressions. This is presumably for compatibility with existing implementations; however it is inconsistent with most of YANG (which is specified to use XPath regular expressions) - unless these are the same.
    
    The fact that the schema language uses a different regular expression
    language than the data model is by itself not a problem I think. What
    is potentially a problem is that RFC 5424 syslog messages are UTF-8
    and hence the regular expression language adopted should be able to
    match on unicode characters. Does POSIX 1003.2 do that? (There also
    needs to be a normative reference to POSIX 1003.2 or whatever is
    finally adopted.)
    
    /js
    
    -- 
    Juergen Schoenwaelder           Jacobs University Bremen gGmbH
    Phone: +49 421 200 3587         Campus Ring 1 | 28759 Bremen | Germany
    Fax:   +49 421 200 3103         <http://www.jacobs-university.de/>
    
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