Greetings,
Mike's interpretation looks correct. Is this something that should be
fixed? If so, should the fix be placed within
draft-ietf-sip-ipv6-abnf-fix?
Thanks,
Brett
________________________________
From: [email protected] [mailto:[email protected]] On
Behalf Of Szilagyi, Mike
Sent: Thursday, December 18, 2008 10:53 AM
To: [email protected]
Subject: [Sip] Question regarding conflicting grammar for IPV6
SIP URI andRFC 3986
RFC 3986 defines the following grammar for a URI:
URI = scheme ":" hier-part [ "?" query ] [ "#"
fragment ]
hier-part = "//" authority path-abempty
/ path-absolute
/ path-rootless
/ path-empty
A SIP URI falls into the 'path-rootless' rule:
path-rootless = segment-nz *( "/" segment )
segment-nz = 1*pchar
pchar = unreserved / pct-encoded / sub-delims / ":" /
"@"
pct-encoded = "%" HEXDIG HEXDIG
unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~"
sub-delims = "!" / "$" / "&" / "'" / "(" / ")"
/ "*" / "+" / "," / ";" / "="
path-rootless does not allow "[" or "]" characters, so the
SIP-URI grammar for IPV6 violates RFC 3986 grammar.
SIP-URI = "sip:" [ userinfo ] hostport
uri-parameters [ headers ]
hostport = host [ ":" port ]
host = hostname / IPv4address / IPv6reference
hostname = *( domainlabel "." ) toplabel [ "." ]
domainlabel = alphanum
/ alphanum *( alphanum / "-" ) alphanum
toplabel = ALPHA / ALPHA *( alphanum / "-" ) alphanum
IPv4address = 1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT "."
1*3DIGIT
IPv6reference = "[" IPv6address "]" <-- *** violates RFC 3986
***
IPv6address = hexpart [ ":" IPv4address ]
hexpart = hexseq / hexseq "::" [ hexseq ] / "::" [
hexseq ]
hexseq = hex4 *( ":" hex4)
hex4 = 1*4HEXDIG
port = 1*DIGIT
These, though valid SIP URIs are not valid URIs:
<sip:[2001:db8::10]>
<sip:cal...@[2001:db8::1]>
Has this already been addressed?
Regards,
Mike
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