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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.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package dns
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import (
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"io/ioutil"
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"os"
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"path/filepath"
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"testing"
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"inet.af/netaddr"
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"tailscale.com/util/dnsname"
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)
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func TestSetDNS(t *testing.T) {
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const orig = "nameserver 9.9.9.9 # orig"
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tmp := t.TempDir()
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resolvPath := filepath.Join(tmp, "etc", "resolv.conf")
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backupPath := filepath.Join(tmp, "etc", "resolv.pre-tailscale-backup.conf")
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if err := os.MkdirAll(filepath.Dir(resolvPath), 0777); err != nil {
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t.Fatal(err)
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}
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if err := ioutil.WriteFile(resolvPath, []byte(orig), 0644); err != nil {
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t.Fatal(err)
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}
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readFile := func(t *testing.T, path string) string {
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t.Helper()
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b, err := ioutil.ReadFile(path)
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if err != nil {
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t.Fatal(err)
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}
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return string(b)
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}
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assertBaseState := func(t *testing.T) {
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if got := readFile(t, resolvPath); got != orig {
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t.Fatalf("resolv.conf:\n%s, want:\n%s", got, orig)
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}
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if _, err := os.Stat(backupPath); !os.IsNotExist(err) {
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t.Fatalf("resolv.conf backup: want it to be gone but: %v", err)
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}
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}
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m := directManager{fs: directFS{prefix: tmp}}
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if err := m.SetDNS(OSConfig{
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Nameservers: []netaddr.IP{netaddr.MustParseIP("8.8.8.8"), netaddr.MustParseIP("8.8.4.4")},
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SearchDomains: []dnsname.FQDN{"ts.net.", "ts-dns.test."},
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MatchDomains: []dnsname.FQDN{"ignored."},
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}); err != nil {
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t.Fatal(err)
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}
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want := `# resolv.conf(5) file generated by tailscale
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# DO NOT EDIT THIS FILE BY HAND -- CHANGES WILL BE OVERWRITTEN
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nameserver 8.8.8.8
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nameserver 8.8.4.4
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search ts.net ts-dns.test
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`
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if got := readFile(t, resolvPath); got != want {
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t.Fatalf("resolv.conf:\n%s, want:\n%s", got, want)
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}
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if got := readFile(t, backupPath); got != orig {
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t.Fatalf("resolv.conf backup:\n%s, want:\n%s", got, orig)
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}
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// Test that a nil OSConfig cleans up resolv.conf.
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if err := m.SetDNS(OSConfig{}); err != nil {
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t.Fatal(err)
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}
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assertBaseState(t)
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// Test that Close cleans up resolv.conf.
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if err := m.SetDNS(OSConfig{Nameservers: []netaddr.IP{netaddr.MustParseIP("8.8.8.8")}}); err != nil {
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t.Fatal(err)
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}
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if err := m.Close(); err != nil {
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t.Fatal(err)
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}
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assertBaseState(t)
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}
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