David Anderson 320cc8fa21 net/dns: verify that systemd-resolved is actually in charge. ...

It's possible to install a configuration that passes our current checks
for systemd-resolved, without actually pointing to systemd-resolved. In
that case, we end up programming DNS in resolved, but that config never
applies to any name resolution requests on the system.

This is quite a far-out edge case, but there's a simple additional check
we can do: if the header comment names systemd-resolved, there should be
a single nameserver in resolv.conf pointing to 127.0.0.53. If not, the
configuration should be treated as an unmanaged resolv.conf.

Fixes #2136.

Signed-off-by: David Anderson <danderson@tailscale.com>

2021-06-15 19:52:02 -07:00

..

resolver

net/dns/resolver: permit larger max responses, signal truncation

2021-06-08 19:29:12 -04:00

config.go

net/dns: replace AuthoritativeSuffixes with nil Route entries.

2021-05-18 14:15:17 -07:00

debian_resolvconf.go

net/dns: add GOOS build tags

2021-04-29 21:34:55 -07:00

direct.go

net/dns: add GOOS build tags

2021-04-29 21:34:55 -07:00

flush_windows.go

Move DNS flush logic to net/dns.

2021-03-25 17:40:52 -07:00

manager_default.go

net/dns: return error from NewOSManager, use it to initialize NM.

2021-04-12 15:51:37 -07:00

manager_freebsd.go

net/dns: fix freebsd DNS manager selection.

2021-04-14 15:34:59 -07:00

manager_linux.go

net/dns: verify that systemd-resolved is actually in charge.

2021-06-15 19:52:02 -07:00

manager_openbsd.go

net/dns: return error from NewOSManager, use it to initialize NM.

2021-04-12 15:51:37 -07:00

manager_test.go

net/dns: replace AuthoritativeSuffixes with nil Route entries.

2021-05-18 14:15:17 -07:00

manager_windows.go

net/dns: on windows, skip site-local v6 resolvers.

2021-04-27 18:24:54 -07:00

manager.go

net/dns: replace AuthoritativeSuffixes with nil Route entries.

2021-05-18 14:15:17 -07:00

nm.go

Revert "net/dns: set IPv4 auto mode in NM, so it lets us set DNS."

2021-05-06 22:31:54 -07:00

noop.go

net/dns: return error from NewOSManager, use it to initialize NM.

2021-04-12 15:51:37 -07:00

openresolv.go

net/dns: add GOOS build tags

2021-04-29 21:34:55 -07:00

osconfig.go

net/dns: make debian_resolvconf correctly clear DNS configs.

2021-04-20 15:51:14 -07:00

registry_windows.go

wgengine/router/dns: move to net/dns.

2021-03-25 16:25:30 -07:00

resolvconf-workaround.sh

net/dns: also include 'tail' and 'base' files when fixing up resolv.conf.

2021-04-10 23:01:11 -07:00

resolvconf.go

net/dns: add GOOS build tags

2021-04-29 21:34:55 -07:00

resolved.go

net/dns: don't use interfaces.Tailscale to find the tailscale interface index.

2021-05-10 15:24:42 -07:00