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tailscale/net/dns
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>
5 years ago
..
resolver net/dns/resolver: permit larger max responses, signal truncation 5 years ago
config.go net/dns: replace AuthoritativeSuffixes with nil Route entries. 5 years ago
debian_resolvconf.go net/dns: add GOOS build tags 5 years ago
direct.go net/dns: add GOOS build tags 5 years ago
flush_windows.go Move DNS flush logic to net/dns. 5 years ago
manager.go net/dns: replace AuthoritativeSuffixes with nil Route entries. 5 years ago
manager_default.go net/dns: return error from NewOSManager, use it to initialize NM. 5 years ago
manager_freebsd.go net/dns: fix freebsd DNS manager selection. 5 years ago
manager_linux.go net/dns: verify that systemd-resolved is actually in charge. 5 years ago
manager_openbsd.go net/dns: return error from NewOSManager, use it to initialize NM. 5 years ago
manager_test.go net/dns: replace AuthoritativeSuffixes with nil Route entries. 5 years ago
manager_windows.go net/dns: on windows, skip site-local v6 resolvers. 5 years ago
nm.go Revert "net/dns: set IPv4 auto mode in NM, so it lets us set DNS." 5 years ago
noop.go net/dns: return error from NewOSManager, use it to initialize NM. 5 years ago
openresolv.go net/dns: add GOOS build tags 5 years ago
osconfig.go net/dns: make debian_resolvconf correctly clear DNS configs. 5 years ago
registry_windows.go wgengine/router/dns: move to net/dns. 5 years ago
resolvconf-workaround.sh net/dns: also include 'tail' and 'base' files when fixing up resolv.conf. 5 years ago
resolvconf.go net/dns: add GOOS build tags 5 years ago
resolved.go net/dns: don't use interfaces.Tailscale to find the tailscale interface index. 5 years ago