net/dns: set WSL /etc/resolv.conf

We also have to make a one-off change to /etc/wsl.conf to stop every
invocation of wsl.exe clobbering the /etc/resolv.conf. This appears to
be a safe change to make permanently, as even though the resolv.conf is
constantly clobbered, it is always the same stable internal IP that is
set as a nameserver. (I believe the resolv.conf clobbering predates the
MS stub resolver.)

Tested on WSL2, should work for WSL1 too.

Fixes #775

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
This commit is contained in:
David Crawshaw
2021-06-25 16:36:36 -07:00
committed by David Crawshaw
parent 9b063b86c3
commit 1147c7fd4f
5 changed files with 325 additions and 15 deletions

37
net/dns/ini_test.go Normal file
View File

@ -0,0 +1,37 @@
// Copyright (c) 2021 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.
package dns
import (
"reflect"
"testing"
)
func TestParseIni(t *testing.T) {
var tests = []struct {
src string
want map[string]map[string]string
}{
{
src: `# appended wsl.conf file
[automount]
enabled = true
root=/mnt/
# added by tailscale
[network] # trailing comment
generateResolvConf = false # trailing comment`,
want: map[string]map[string]string{
"automount": map[string]string{"enabled": "true", "root": "/mnt/"},
"network": map[string]string{"generateResolvConf": "false"},
},
},
}
for _, test := range tests {
got := parseIni(test.src)
if !reflect.DeepEqual(got, test.want) {
t.Errorf("for:\n%s\ngot: %v\nwant: %v", test.src, got, test.want)
}
}
}