[ruby-core:74010] [Ruby trunk Bug#12112] Resolv.getname with IPv6 noop

Issue #12112 has been updated by Dmitri Dolguikh.

File 12112_fixes_ipv6_ptr_resolver.patch added

I'm seeing this issue on 2.0.0, 2.2.1, 2.2.2, but not 1.9.3 and 2.2.3 (I suspect all versions between 2.0.0 and 2.2.3 are broken).

This is due to how Resolv::IPv6#to_name and Resolv::Name.initialize work. In 2.2.3 Resolv::Name constructor was changed to convert labels to Resolv::Label::Str. Before that any comparison beween instances of Resolv::Name constructed from a string via Resolv::Name.create and Resolv::Name.new would fail. 1.9.3 is a bit different, as it's implementation of Resolv::Name.== converts labels to a string for the comparison.

 Patch for ruby_2_0_0 branch attached.



----------------------------------------
Bug #12112: Resolv.getname with IPv6 noop
https://bugs.ruby-lang.org/issues/12112#change-57163

* Author: Daniel Helgenberger
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: 1.9.3 - 2.2.1
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
----------------------------------------
Currently reverse resolving IPv6 addresses using stdlib Resolv does not work.

### How reproducible
always

### Steps:
1. Require 'resolv'
2. Use #getname or #getnames with a valid, reverse resolvable IPv6 address

### Result:
resolv error with #getname, empty result using #getnames

### Expected result:
Resolved to hostname as with IPv4

### Example, system:

~~~
dig @8.8.8.8 +short -x 2a00:1450:4001:803::1018                                                                           
fra07s30-in-x18.1e100.net.
~~~

### ruby:

~~~
[1] pry(main)> require 'resolv'
=> false
[2] pry(main)> resolver = Resolv::DNS.new(:nameserver => '8.8.8.8')
#[...]
[3] pry(main)> resolver.getname('2a00:1450:4001:803::1018')
Resolv::ResolvError: no name for 2a00:1450:4001:803::1018
from ~/.rvm/rubies/ruby-2.0.0-p643/lib/ruby/2.0.0/resolv.rb:128:in `getname'
[4] pry(main)> resolver.getnames('2a00:1450:4001:803::1018')
=> []
~~~

---Files--------------------------------
12112_fixes_ipv6_ptr_resolver.patch (846 Bytes)


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