mirror of
https://github.com/tailscale/tailscale.git
synced 2024-11-29 13:05:46 +00:00
9b063b86c3
This is preliminary work for using the directManager as part of a wslManager on windows, where in addition to configuring windows we'll use wsl.exe to edit the linux file system and modify the system resolv.conf. The pinholeFS is a little funky, but it's designed to work through simple unix tools via wsl.exe without invoking bash. I would not have thought it would stand on its own like this, but it turns out it's useful for writing a test for the directManager. Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
84 lines
2.2 KiB
Go
84 lines
2.2 KiB
Go
// 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 (
|
|
"io/ioutil"
|
|
"os"
|
|
"path/filepath"
|
|
"testing"
|
|
|
|
"inet.af/netaddr"
|
|
"tailscale.com/util/dnsname"
|
|
)
|
|
|
|
func TestSetDNS(t *testing.T) {
|
|
const orig = "nameserver 9.9.9.9 # orig"
|
|
tmp := t.TempDir()
|
|
resolvPath := filepath.Join(tmp, "etc", "resolv.conf")
|
|
backupPath := filepath.Join(tmp, "etc", "resolv.pre-tailscale-backup.conf")
|
|
|
|
if err := os.MkdirAll(filepath.Dir(resolvPath), 0777); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
if err := ioutil.WriteFile(resolvPath, []byte(orig), 0644); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
readFile := func(t *testing.T, path string) string {
|
|
t.Helper()
|
|
b, err := ioutil.ReadFile(path)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
return string(b)
|
|
}
|
|
assertBaseState := func(t *testing.T) {
|
|
if got := readFile(t, resolvPath); got != orig {
|
|
t.Fatalf("resolv.conf:\n%s, want:\n%s", got, orig)
|
|
}
|
|
if _, err := os.Stat(backupPath); !os.IsNotExist(err) {
|
|
t.Fatalf("resolv.conf backup: want it to be gone but: %v", err)
|
|
}
|
|
}
|
|
|
|
m := directManager{fs: directFS{prefix: tmp}}
|
|
if err := m.SetDNS(OSConfig{
|
|
Nameservers: []netaddr.IP{netaddr.MustParseIP("8.8.8.8"), netaddr.MustParseIP("8.8.4.4")},
|
|
SearchDomains: []dnsname.FQDN{"ts.net.", "ts-dns.test."},
|
|
MatchDomains: []dnsname.FQDN{"ignored."},
|
|
}); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
want := `# resolv.conf(5) file generated by tailscale
|
|
# DO NOT EDIT THIS FILE BY HAND -- CHANGES WILL BE OVERWRITTEN
|
|
|
|
nameserver 8.8.8.8
|
|
nameserver 8.8.4.4
|
|
search ts.net ts-dns.test
|
|
`
|
|
if got := readFile(t, resolvPath); got != want {
|
|
t.Fatalf("resolv.conf:\n%s, want:\n%s", got, want)
|
|
}
|
|
if got := readFile(t, backupPath); got != orig {
|
|
t.Fatalf("resolv.conf backup:\n%s, want:\n%s", got, orig)
|
|
}
|
|
|
|
// Test that a nil OSConfig cleans up resolv.conf.
|
|
if err := m.SetDNS(OSConfig{}); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
assertBaseState(t)
|
|
|
|
// Test that Close cleans up resolv.conf.
|
|
if err := m.SetDNS(OSConfig{Nameservers: []netaddr.IP{netaddr.MustParseIP("8.8.8.8")}}); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
if err := m.Close(); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
assertBaseState(t)
|
|
}
|