[Bug 2055302] Re: Consider backporting glibc bug 12154 to ubuntu 20.04 - DNS resolution fails if a CNAME target begins with a hyphen

[Manuel Bucher]

Hi, I've set up this now:

* `ping ok-bug1870497.neon.rocks`

This is a cname to `-bug1870497.neon.rocks` and resolves to one of my
servers. Running the commands currently shows this log (on 22.04):

```
$ ping ok-bug1870497.neon.rocks
PING bug1870497.neon.rocks [...]
```

* `ping error-bug1870497.neon.rocks`: is a cname to
`-bug1870497.neon.rocks`

This is a cname to `bug1870497.neon.rocks` and then resolves to one of
my servers. Running the commands currently shows this log (on 22.04):

```
$ ping error-bug1870497.neon.rocks
ping: error-bug1870497.neon.rocks: System error
```

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https://bugs.launchpad.net/bugs/2055302

Title:
  Consider backporting glibc bug 12154 to ubuntu 20.04 -  DNS resolution
  fails if a CNAME target begins with a hyphen

Status in glibc package in Ubuntu:
  Fix Released
Status in glibc source package in Focal:
  Won't Fix
Status in glibc source package in Jammy:
  New

Bug description:
  See:
  * https://bugzilla.mozilla.org/show_bug.cgi?id=1870497
  * https://sourceware.org/bugzilla/show_bug.cgi?id=12154

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