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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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11
net/dns/direct_notlinux.go Normal file
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// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build !linux
package dns
func (m *directManager) runFileWatcher() {
// Not implemented on other platforms. Maybe it could resort to polling.
}