[Bug 1661041] [NEW] dnscache script breaks if /run/resolvconf/interface is empty

[Murukesh Mohanan]

Public bug reported:

Following Debian bug 318464, a script was added to resolvconf which
helpfully overwrites  dnscache's @ file with root servers if the there
are no nameservers offered.

In my case, the system, which is a DNS server itself, does not use DHCP
or other network-provided DNS servers, but runs both tinydns and
dnscache on different interfaces.

Naturally, the script finds no offered nameservers, overwrites the @
file, and screws over dnscache since we're behind a firewall which
blocks outgoing DNS traffic.

I'm not sure how to fix the issue (other than disabling the script
somehow, or overwriting /etc/dnsroots.global, which is where djbdns
keeps the list of root servers).

Version:

Ubuntu 14.04.5
djbdns 1:1.05-8ubuntu1
resolvconf 1.69ubuntu1.1

[1]: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=318464

** Affects: resolvconf (Ubuntu)
     Importance: Undecided
         Status: New

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Title:
  dnscache script breaks if /run/resolvconf/interface is empty

Status in resolvconf package in Ubuntu:
  New

Bug description:
  Following Debian bug 318464, a script was added to resolvconf which
  helpfully overwrites  dnscache's @ file with root servers if the there
  are no nameservers offered.

  In my case, the system, which is a DNS server itself, does not use
  DHCP or other network-provided DNS servers, but runs both tinydns and
  dnscache on different interfaces.

  Naturally, the script finds no offered nameservers, overwrites the @
  file, and screws over dnscache since we're behind a firewall which
  blocks outgoing DNS traffic.

  I'm not sure how to fix the issue (other than disabling the script
  somehow, or overwriting /etc/dnsroots.global, which is where djbdns
  keeps the list of root servers).

  Version:

  Ubuntu 14.04.5
  djbdns 1:1.05-8ubuntu1
  resolvconf 1.69ubuntu1.1

  [1]: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=318464

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