Bug #8464: IPAddr cannot parse link-local IPv6 address.

• Status: Rejected
• Assignee: knu (Akinori MUSHA)
• Target version: -
• ruby -v: ruby 2.0.0p195 (2013-05-14 revision 40734) [x86_64-darwin12.3.0]

[aselder (Andrew Selder)]

1.9.3p374 :001 > require 'ipaddr'
=> true
1.9.3p374 :002 > IPAddr.new("0:0:0:0:0:0:0:1%0")
ArgumentError: invalid address
from /Users/andrew/.rvm/rubies/ruby-2.0.0-p195/lib/ruby/2.0.0/ipaddr.rb:559:in in6_addr' from /Users/andrew/.rvm/rubies/ruby-2.0.0-p195/lib/ruby/2.0.0/ipaddr.rb:496:in initialize'
from (irb):2:in new' from (irb):2 from /Users/andrew/.rvm/rubies/ruby-2.0.0-p195/bin/irb:16:in '

Same behavior in Ruby 1.9.3 all patch levels

[cedric.brancourt (Cedric Brancourt)]

Not sure this need a fix.
The %0 part of the example is the scope ( zone ) and should not be part of the address.

It is appended by operating system in the textual representation of the endpoint ( for interface identification ), and format depend on the operating system.

But it is not part of the address , see http://www.ietf.org/rfc/rfc4007.txt

This is the way I understand it. If I am right , this is not a bug.

[knu (Akinori MUSHA)]

• Category set to lib
• Status changed from Open to Feedback
• Assignee set to knu (Akinori MUSHA)

IPAddr currently does not support scope ID's.

Making IPAddr deal with scope ID's would mean a lot more than just ignoring it (starting with adding #scope_id).
If you are going to request such a feature, you'll have to investigate, for example, in what contexts (libraries/methods/commands) an IPv6 address with a scope ID is valid and accepted, if #to_s should include it or another method should be added for that, how it would affect the backward compatibility, etc.

On the other hand, you can use str.sub(/%.*/m, '') or str[/[^%]*/m] if you just want to drop the scope ID part.

[drbrain (Eric Hodel)]

Thanks to the recently added Socket.getifaddrs we now have the ability to map scope names to interface ids for use in IPv6 multicast, for example.

[knu (Akinori MUSHA)]

• Status changed from Feedback to Rejected
• Backport deleted (1.9.3: UNKNOWN, 2.0.0: UNKNOWN)

Closing due to feedback timeout.