mirror of
https://github.com/tailscale/tailscale.git
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84 lines
1.9 KiB
Go
84 lines
1.9 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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"fmt"
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"strings"
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"github.com/tailscale/wireguard-go/tun"
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"golang.org/x/sys/windows/registry"
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"tailscale.com/types/logger"
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)
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type windowsManager struct {
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logf logger.Logf
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guid string
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}
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func newManager(mconfig ManagerConfig) managerImpl {
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return windowsManager{
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logf: mconfig.Logf,
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guid: tun.WintunGUID,
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}
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}
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func setRegistry(path, nameservers, domains string) error {
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key, err := registry.OpenKey(registry.LOCAL_MACHINE, path, registry.READ|registry.SET_VALUE)
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if err != nil {
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return fmt.Errorf("opening %s: %w", path, err)
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}
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defer key.Close()
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err = key.SetStringValue("NameServer", nameservers)
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if err != nil {
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return fmt.Errorf("setting %s/NameServer: %w", path, err)
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}
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err = key.SetStringValue("Domain", domains)
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if err != nil {
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return fmt.Errorf("setting %s/Domain: %w", path, err)
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}
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return nil
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}
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func (m windowsManager) Up(config Config) error {
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var ipsv4 []string
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var ipsv6 []string
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for _, ip := range config.Nameservers {
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if ip.Is4() {
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ipsv4 = append(ipsv4, ip.String())
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} else {
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ipsv6 = append(ipsv6, ip.String())
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}
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}
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nsv4 := strings.Join(ipsv4, ",")
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nsv6 := strings.Join(ipsv6, ",")
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var domains string
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if len(config.Domains) > 0 {
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if len(config.Domains) > 1 {
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m.logf("only a single search domain is supported")
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}
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domains = config.Domains[0]
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}
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v4Path := `SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\` + m.guid
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if err := setRegistry(v4Path, nsv4, domains); err != nil {
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return err
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}
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v6Path := `SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters\Interfaces\` + m.guid
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if err := setRegistry(v6Path, nsv6, domains); err != nil {
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return err
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}
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return nil
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}
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func (m windowsManager) Down() error {
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return m.Up(Config{Nameservers: nil, Domains: nil})
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}
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