From: "clairity (claire c) via ruby-core" <ruby-core@...>
Date: 2023-05-27T14:39:09+00:00
Subject: [ruby-core:113685] [Ruby master Bug#19697] Resolv::DNS resolution for international domains fails with "Encoding::CompatibilityError: incompatible character encodings: UTF-8 and ASCII-8BIT"

Issue #19697 has been updated by clairity (claire c).





clairity (claire c) wrote:

> i try to resolve a registered international domain, and instead of receiving DNS records, get an `incompatible character encodings` error:

> 

> ```

> # irb

> 3.2.2 :001 > require 'resolv'

> 3.2.2 :002 > res = Resolv::DNS.open { |dns|  dns.getresource '������.������', Resolv::DNS::Resource::IN::MX  }

> ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:777:in `[]=': incompatible character encodings: UTF-8 and ASCII-8BIT (Encoding::CompatibilityError)

>   from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:777:in `sender'

>   from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:527:in `block in fetch_resource'

>   from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:1125:in `block (3 levels) in resolv'

>   from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:1123:in `each'

>   from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:1123:in `block (2 levels) in resolv'

>   from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:1122:in `each'

>   from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:1122:in `block in resolv'

>   from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:1120:in `each'

>   from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:1120:in `resolv'

>   from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:521:in `fetch_resource'

>   from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:507:in `each_resource'

>   from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:488:in `getresource'

>   from (irb):3:in `block in <top (required)>'

>   from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:298:in `open'

>   from (irb):3:in `<main>'

>   from ~/.rvm/gems/ruby-3.2.2/gems/irb-1.6.4/exe/irb:9:in `<top (required)>'

>   ... 4 levels...

> ```

> 

> i also tried this command in 3.3.0-preview1 and 2.1.4, receiving the same error. the expected response is to get DNS records for `������.������` (or any registered international domain). `dig ������.������` does indeed return a short but valid DNS record.



edit: i should add that unicode remaining unicode characters is strongly preferred over being translated into punycode, as the former is human- and machine-readable but the latter is only machine-readable (and as a result, can introduce social engineering vulnerabilities for instance).





----------------------------------------

Bug #19697: Resolv::DNS resolution for international domains fails with "Encoding::CompatibilityError: incompatible character encodings: UTF-8 and ASCII-8BIT"

https://bugs.ruby-lang.org/issues/19697#change-103329



* Author: clairity (claire c)

* Status: Open

* Priority: Normal

* ruby -v: 3.2.2

* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN

----------------------------------------

i try to resolve a registered international domain, and instead of receiving DNS records, get an `incompatible character encodings` error:



```

# irb

3.2.2 :001 > require 'resolv'

3.2.2 :002 > res = Resolv::DNS.open { |dns|  dns.getresource '������.������', Resolv::DNS::Resource::IN::MX  }

~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:777:in `[]=': incompatible character encodings: UTF-8 and ASCII-8BIT (Encoding::CompatibilityError)

  from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:777:in `sender'

  from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:527:in `block in fetch_resource'

  from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:1125:in `block (3 levels) in resolv'

  from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:1123:in `each'

  from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:1123:in `block (2 levels) in resolv'

  from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:1122:in `each'

  from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:1122:in `block in resolv'

  from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:1120:in `each'

  from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:1120:in `resolv'

  from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:521:in `fetch_resource'

  from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:507:in `each_resource'

  from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:488:in `getresource'

  from (irb):3:in `block in <top (required)>'

  from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:298:in `open'

  from (irb):3:in `<main>'

  from ~/.rvm/gems/ruby-3.2.2/gems/irb-1.6.4/exe/irb:9:in `<top (required)>'

  ... 4 levels...

```



i also tried this command in 3.3.0-preview1 and 2.1.4, receiving the same error. the expected response is to get DNS records for `������.������` (or any registered international domain). `dig ������.������` does indeed return a short but valid DNS record.











-- 

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