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189f359609
OpenBSD 6.9 and up has a daemon which handles nameserver configuration. This PR teaches the OpenBSD dns manager to check if resolvd is being used. If it is, it will use the route(8) command to tell resolvd to add the Tailscale dns entries to resolv.conf Signed-off-by: Aaron Bieber <aaron@bolddaemon.com>
75 lines
1.6 KiB
Go
75 lines
1.6 KiB
Go
// Copyright (c) 2020 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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"bytes"
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"fmt"
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"os"
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"tailscale.com/types/logger"
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)
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type kv struct {
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k, v string
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}
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func (kv kv) String() string {
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return fmt.Sprintf("%s=%s", kv.k, kv.v)
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}
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func NewOSConfigurator(logf logger.Logf, interfaceName string) (OSConfigurator, error) {
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return newOSConfigurator(logf, interfaceName,
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newOSConfigEnv{
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rcIsResolvd: rcIsResolvd,
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fs: directFS{},
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})
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}
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// newOSConfigEnv are the funcs newOSConfigurator needs, pulled out for testing.
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type newOSConfigEnv struct {
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fs directFS
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rcIsResolvd func(resolvConfContents []byte) bool
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}
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func newOSConfigurator(logf logger.Logf, interfaceName string, env newOSConfigEnv) (ret OSConfigurator, err error) {
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var debug []kv
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dbg := func(k, v string) {
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debug = append(debug, kv{k, v})
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}
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defer func() {
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if ret != nil {
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dbg("ret", fmt.Sprintf("%T", ret))
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}
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logf("dns: %v", debug)
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}()
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bs, err := env.fs.ReadFile(resolvConf)
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if os.IsNotExist(err) {
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dbg("rc", "missing")
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return newDirectManager(logf), nil
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}
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if err != nil {
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return nil, fmt.Errorf("reading /etc/resolv.conf: %w", err)
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}
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if env.rcIsResolvd(bs) {
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dbg("resolvd", "yes")
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return newResolvdManager(logf, interfaceName)
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}
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dbg("resolvd", "missing")
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return newDirectManager(logf), nil
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}
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func rcIsResolvd(resolvConfContents []byte) bool {
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// If we have the string "# resolvd:" in resolv.conf resolvd(8) is
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// managing things.
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if bytes.Contains(resolvConfContents, []byte("# resolvd:")) {
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return true
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}
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return false
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}
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