[Bug 1647031] Re: systemd-resolved’s 127.0.0.53 server does not follow CNAME records

[Martin Pitt]

I confirm the fact that "dig @127.0.0.53 wiki.freedesktop.org" only
gives the CNAME response, not the resolution of
"annarchy.freedesktop.org." as well, which is sufficient to confirm the
fix.

But nevertheless, firefox, wget, ping etc. on wiki.freedesktop.org all
work fine, but these use NSS. Google Chrome also works fine (which uses
resolv.conf), so this appears to be more like an implementation detail
than a major user-visible bug to me? Can you confirm this, or am I
missing something?

** Changed in: systemd (Ubuntu)
   Importance: Undecided => Low

** Changed in: systemd (Ubuntu)
       Status: Confirmed => Triaged

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Title:
  systemd-resolved’s 127.0.0.53 server does not follow CNAME records

Status in systemd:
  New
Status in systemd package in Ubuntu:
  Triaged

Bug description:
  $ systemd-resolve www.freedesktop.org
  www.freedesktop.org: 131.252.210.176
                       2610:10:20:722:a800:ff:feda:470f
                       (annarchy.freedesktop.org)

  -- Information acquired via protocol DNS in 673.6ms.
  -- Data is authenticated: no
  $ ping www.freedesktop.org
  ping: www.freedesktop.org: Name or service not known
  $ cat /etc/resolv.conf
  # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
  #     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
  # 127.0.0.53 is the systemd-resolved stub resolver.
  # run "systemd-resolve --status" to see details about the actual nameservers.

  nameserver 127.0.0.53
  $ dig +no{cmd,comments,stats} www.freedesktop.org @127.0.0.53
  ;www.freedesktop.org.		IN	A
  www.freedesktop.org.	7146	IN	CNAME	annarchy.freedesktop.org.
  $ dig +no{cmd,comments,stats} www.freedesktop.org @8.8.8.8
  ;www.freedesktop.org.		IN	A
  www.freedesktop.org.	14399	IN	CNAME	annarchy.freedesktop.org.
  annarchy.freedesktop.org. 14399	IN	A	131.252.210.176

  I trust it needn’t be explained why this makes the internet almost
  completely useless in zesty.

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