Parsing the Injection-Info: header field

[Julien ÉLIE <julien@xxxxxxxxxxxxxxx>]

Hi,

I follow a discussion that was initiated in news.software.nntp:

   http://groups.google.fr/group/news.software.nntp/browse_frm/thread/c704d0859dd84d38
   <news:slrnhjcc9b.u40.steve@xxxxxxxxxxxxxxx>


According to Section 3.2.8 of RFC 5536:


  injection-info  =  "Injection-Info:" SP [CFWS] path-identity
                     [CFWS] *( ";" [CFWS] parameter ) [CFWS] CRLF

     NOTE: The syntax of <parameter> (Section 5.1 of [RFC2045], as
     amended by [RFC2231]), taken in conjunction with the folding rules
     of [RFC0822] (note: not [RFC2822] or [RFC5322]), effectively
     allows [CFWS] to occur on either side of the "=" inside a
     <parameter>.


I do not understand well that point.
Does it mean that CFWS is allowed both before and after the "="?
Why should RFC 822 be followed here?  And why doesn't RFC 5322 mention
that?

I thought that RFC 5536 was based upon RFC 5322 and therefore would
not allow a space before "=", and would allow a space after "=" only
if <value> is a quoted-string.



Just afterwards:


  <attribute>              format of <value>
  --------------------     -----------------
  "posting-host"           a <host-value>
  "posting-account"        any <value>
  "logging-data"           any <value>
  "mail-complaints-to"     an <address-list>

     NOTE: Since any such <host-value> or <address-list> also has to be
     a syntactically correct <value>, it will usually be necessary to
     encapsulate it as a <quoted-string>, for example:

      posting-host = "posting.example.com:192.0.2.1"


So it shows that a space is allowed before "=".
Isn't it a difference with RFC 5322 that ought to be mentioned in appendix C?

When it is said that <host-value> is encapsulated as a <quoted-string>, does
it mean that:

posting-host = "pos\ting.example.com"
posting-host =   (Comment)   "posting.example.com"  (Comment)

are two valid values for this parameter?  (Both being "posting.example.com".)



Incidentally, I do not know how to parse

posting-host="20bd:20bd::1"

It could be the IPv6 address "20bd:20bd::1" or the host name "20bd" associated
with the IPv6 address "20bd::1"!

--
Julien ÉLIE

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