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net/dns: make "direct" mode on Linux warn on resolv.conf fights

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Run an inotify goroutine and watch if another program takes over
/etc/inotify.conf. Log if so.

For now this only logs. In the future I want to wire it up into the
health system to warn (visible in "tailscale status", etc) about the
situation, with a short URL to more info about how you should really
be using systemd-resolved if you want programs to not fight over your
DNS files on Linux.

Updates #4254 etc etc

Change-Id: I86ad9125717d266d0e3822d4d847d88da6a0daaa
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2022-11-12 21:54:10 -08:00
committed by Brad Fitzpatrick
parent b87cb2c4a5
commit 001f482aca
6 changed files with 157 additions and 7 deletions
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go.mod
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@@ -30,6 +30,7 @@ require (
github.com/goreleaser/nfpm v1.10.3
github.com/hdevalence/ed25519consensus v0.0.0-20220222234857-c00d1f31bab3
github.com/iancoleman/strcase v0.2.0
github.com/illarion/gonotify v1.0.1
github.com/insomniacslk/dhcp v0.0.0-20211209223715-7d93572ebe8e
github.com/jsimonetti/rtnetlink v1.1.2-0.20220408201609-d380b505068b
github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51