[Bug 1713457] Re: DNS search domain not removed from resolv.conf on disconnect

[Laurent Bigonville]

I cannot reproduce this on debian.

It seems that one of the difference is that resolvconf support is
disabled in the ubuntu package. I feel that the problem comes from here.
resovconf support should probably (not tested) be enabled in case it's
pulled on the system by a dependency

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Title:
  DNS search domain not removed from resolv.conf on disconnect

Status in network-manager package in Ubuntu:
  Confirmed
Status in resolvconf package in Ubuntu:
  Confirmed

Bug description:
  When I connect to a wireless network that sets a DNS search domain
  name via DHCP, the line 'search <domain>' is added to /etc/resolv.conf
  as expected.  But if I then disconnect and connect to a different
  network, it is not removed from resolv.conf.  If the second network
  also sets a search domain name, that one gets appended to resolv.conf
  along with the first one, and so on.  Depending on the network, this
  can cause DNS leaks, name resolution failures, or other misbehavior.

  To be sure this wasn't some kind of user configuration issue, I
  reproduced this on the artful daily live image (artful-desktop-
  amd64.iso, 2017-08-27), from which I'm writing this report.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: network-manager 1.8.2-1ubuntu3
  ProcVersionSignature: Ubuntu 4.12.0-11.12-generic 4.12.5
  Uname: Linux 4.12.0-11-generic x86_64
  ApportVersion: 2.20.6-0ubuntu7
  Architecture: amd64
  CasperVersion: 1.384
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Aug 28 10:34:22 2017
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  IpRoute:
   default via 172.20.20.1 dev wlp3s0 proto static metric 600
   169.254.0.0/16 dev wlp3s0 scope link metric 1000
   172.20.20.0/24 dev wlp3s0 proto kernel scope link src 172.20.20.20 metric 600
  LiveMediaBuild: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170827)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: network-manager
  UpgradeStatus: No upgrade log present (probably fresh install)
  nmcli-dev:
   DEVICE     TYPE      STATE        DBUS-PATH                                  CONNECTION   CON-UUID                              CON-PATH
   wlp3s0     wifi      connected    /org/freedesktop/NetworkManager/Devices/3  xfinitywifi  39ffbbfc-1c1e-41c9-b3eb-c513065c3ea6  /org/freedesktop/NetworkManager/ActiveConnection/2
   enp0s31f6  ethernet  unavailable  /org/freedesktop/NetworkManager/Devices/2  --           --                                    --
   lo         loopback  unmanaged    /org/freedesktop/NetworkManager/Devices/1  --           --                                    --
  nmcli-nm:
   RUNNING  VERSION  STATE      STARTUP  CONNECTIVITY  NETWORKING  WIFI-HW  WIFI     WWAN-HW  WWAN
   running  1.8.2    connected  started  full          enabled     enabled  enabled  enabled  enabled

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