[ruby-core:86243] [Ruby trunk Bug#14612] IPv6 address inconsistency (downcase vs. upcase)

Issue #14612 has been updated by hugopeixoto (Hugo Peixoto).

File resolv-ipv6-to_s.patch added

shevegen (Robert A. Heiler) wrote:
> Is there a standard that mandates or prefers either variant?

RFC 5952 recommends the usage of lower case letters: https://tools.ietf.org/html/rfc5952#section-4.3

The `Resolv` module seems to be formatting the addresses in uppercase:

```ruby
Resolv::IPv6.create("2400:8902::f03c:91ff:fe69:a454").to_s #=> "2400:8902::F03C:91FF:FE69:A454"
```

I noticed there's an `ipaddr` module that handles formatting as well, so in the attached patch I am using `IPAddr#new` to reuse the existing code. I also added some tests.

I am not sure if adding the dependency here is the right way to do it.

----------------------------------------
Bug #14612: IPv6 address inconsistency (downcase vs. upcase)
https://bugs.ruby-lang.org/issues/14612#change-71143

* Author: chucke (Tiago Cardoso)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.5.0
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
----------------------------------------
I've noticed that sometimes ip addresses re shown using a-f characters in downcase, other times upcase. Here is a small script to show results:

```ruby
require "resolv"
require "socket"
puts TCPSocket.getaddress("nghttp2.org") #=> "2400:8902::f03c:91ff:fe69:a454"
puts Resolv.getaddresses("nghttp2.org") #=> ["139.162.123.134", "2400:8902::F03C:91FF:FE69:A454"]
```

Results might be system-dependent (I'm using Mac OS High Sierra).

This makes compare operations a bit harder. 

---Files--------------------------------
resolv-ipv6-to_s.patch (1.48 KB)


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