[Sipping] Re: [Sip-implementors] SIP/IPv6 torture test and possible interactionwith rfc3261 ABNF

Vijay,

[copy from your post ] current RFC3261 ABNF:
via-received   =  "received" EQUAL (IPv4address / IPv6address)
IPv6address    =  hexpart [ ":" IPv4address ]

IMO this is clearly a bug.

The general ABNF rules for header parameters are:
generic-param  =  token [ EQUAL gen-value ]
gen-value      =  token / host / quoted-string

The intention of the 'via-received' rule is clearly to restrict the allowed 
values of 'gen-value' by allowing only IP addresses (v4/v6). As such, its 
possible values should be a subset of those produced by the "gen-value" 
rule. However, the ":" character is not part of "token" and can therefore 
only be produced as part of "host" (i.e. between '[' ']' brackets) or as 
part of quoted-string (i.e. between '"' '"' quotes)

via-received should have been written as "host" but excluding "hostname", 
i.e.
via-received = IPv4address / IPv6reference as you stated

Historical note: RFC2543 defined it as
via-received	   = "received" "=" hostHowever, "host" was defined as
host            = hostname | IPv4addressso IPv6 addresses were not 
considered back then, and even hostnames were allowed. Considering that 
RFC3261 now defines "host" as
host             =  hostname / IPv4address / IPv6referenceit is again clear 
(and consistency mandates) that "IPv6reference" is correct

Regards,

Jeroen

----- Original Message ----- 
From: "Vijay K. Gurbani" <vkg@lucent.com>
To: "SIPPING LIST" <sipping@ietf.org>
Cc: "SIP Implementors" <sip-implementors@cs.columbia.edu>
Sent: Tuesday, February 28, 2006 12:40 AM
Subject: [Sip-implementors] SIP/IPv6 torture test and possible 
interactionwith rfc3261 ABNF

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