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core: nm-dns-dnsmasq: listen on ipv6 localhost too

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Trying to resolve hosts using localhost errors out for ipv6 attempts:
  $ host www.seznam.cz localhost
  ;; communications error to ::1#53: connection refused
  ;; communications error to ::1#53: connection refused
  Using domain server:
  Name: localhost
  Address: 127.0.0.1#53
  Aliases:

  www.seznam.cz has address 77.75.77.222
  www.seznam.cz has address 77.75.79.222
  ;; communications error to ::1#53: connection refused
  ;; communications error to ::1#53: connection refused
  www.seznam.cz has IPv6 address 2a02:598:a::79:222
  www.seznam.cz has IPv6 address 2a02:598:2::1222
  ;; communications error to ::1#53: connection refused
  ;; communications error to ::1#53: connection refused

It's because on some distros (like openSUSE), localhost is defined both
as 127.0.0.1 and ::1.

So listen on ::1 too. This makes ipv4-switchoff easier.
/etc/resolv.conf should likely be updated to contain ::1 eventually too
(see update_dns()).

Fixes https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/issues/1188
This commit is contained in:
Jiri Slaby (SUSE) 2023-01-17 10:24:31 +01:00 • committed by Íñigo Huguet
parent 0e121f5658
commit a0482a4e35
1 changed files with 3 additions and 2 deletions
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5
src/core/dns/nm-dns-dnsmasq.c
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@ -521,9 +521,10 @@ _gl_pid_spawn_next_step(void)
argv[argv_idx++] = "--no-resolv"; /* Use only commandline */
argv[argv_idx++] = "--keep-in-foreground";
argv[argv_idx++] = "--no-hosts"; /* don't use /etc/hosts to resolve */
argv[argv_idx++] = "--bind-interfaces";
argv[argv_idx++] = "--bind-dynamic";
argv[argv_idx++] = "--pid-file=" PIDFILE;
argv[argv_idx++] = "--listen-address=127.0.0.1"; /* Should work for both 4 and 6 */
argv[argv_idx++] = "--listen-address=127.0.0.1";
argv[argv_idx++] = "--listen-address=::1";
argv[argv_idx++] = "--cache-size=400";
argv[argv_idx++] = "--clear-on-reload"; /* clear cache when dns server changes */
argv[argv_idx++] = "--conf-file=/dev/null"; /* avoid loading /etc/dnsmasq.conf */