Re: getaddrinfo chokes at hostnames containing "emoji" characters

[Florian Weimer <fweimer at redhat dot com>]

On 05/16/2018 10:40 AM, Name Surname wrote:
> Greetings everyone.
>
> I recently bought a domain name containing "emoji" characters, as a
> novelty and in order to do some experiments. I tried getting the IP
> address associated to it using getaddrinfo, however, it errs and returns
> "Name or service not known". The same thing happens with any program
> that uses glibc for name resolution. I understand that emoji domains are
> not valid according to IDNA2008, however, some ccTLDs sell them, they
> were supported according to IDNA2003, and web browsers resolve them
> normally according to IDNA2003 (at least firefox does).
>
> Is this a bug or a feature?

In the near future, glibc will use the system libidn2 library to 
implement AI_IDN getaddrinfo support.  You will have to convince the 
libidn2 maintainers to enable Emoji support (by default), but as long as 
there is no published standard for that at all (perhaps with the 
exception of Unicode TR46 transitional mode, which is not recommended), 
this seems difficult.

Thanks,
Florian