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https://github.com/tailscale/tailscale.git
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b4f70d8232
On Win10, there's a hardcoded GUID and this works. On Win7, this GUID changes and we need to ask the tun for its LUID and convert that from the GUID. This commit uses the computed GUID that is placed in InterfaceName. Diagnosed by Jason Donnenfeld. (Thanks!)
125 lines
3.3 KiB
Go
125 lines
3.3 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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"os/exec"
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"strings"
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"syscall"
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"time"
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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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const (
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ipv4RegBase = `SYSTEM\CurrentControlSet\Services\Tcpip\Parameters`
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ipv6RegBase = `SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters`
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tsRegBase = `SOFTWARE\Tailscale IPN`
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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: mconfig.InterfaceName,
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}
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}
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// keyOpenTimeout is how long we wait for a registry key to
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// appear. For some reason, registry keys tied to ephemeral interfaces
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// can take a long while to appear after interface creation, and we
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// can end up racing with that.
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const keyOpenTimeout = time.Minute
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func setRegistryString(path, name, value string) error {
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key, err := openKeyWait(registry.LOCAL_MACHINE, path, registry.SET_VALUE, keyOpenTimeout)
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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(name, value)
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if err != nil {
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return fmt.Errorf("setting %s[%s]: %w", path, name, err)
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}
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return nil
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}
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func (m windowsManager) setNameservers(basePath string, nameservers []string) error {
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path := fmt.Sprintf(`%s\Interfaces\%s`, basePath, m.guid)
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value := strings.Join(nameservers, ",")
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return setRegistryString(path, "NameServer", value)
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}
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func (m windowsManager) setDomains(basePath string, domains []string) error {
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path := fmt.Sprintf(`%s\Interfaces\%s`, basePath, m.guid)
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value := strings.Join(domains, ",")
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return setRegistryString(path, "SearchList", value)
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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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if err := m.setNameservers(ipv4RegBase, ipsv4); err != nil {
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return err
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}
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if err := m.setDomains(ipv4RegBase, config.Domains); err != nil {
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return err
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}
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if err := m.setNameservers(ipv6RegBase, ipsv6); err != nil {
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return err
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}
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if err := m.setDomains(ipv6RegBase, config.Domains); err != nil {
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return err
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}
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newSearchList := strings.Join(config.Domains, ",")
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if err := setRegistryString(tsRegBase, "SearchList", newSearchList); err != nil {
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return err
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}
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// Force DNS re-registration in Active Directory. What we actually
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// care about is that this command invokes the undocumented hidden
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// function that forces Windows to notice that adapter settings
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// have changed, which makes the DNS settings actually take
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// effect.
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//
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// This command can take a few seconds to run, so run it async, best effort.
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go func() {
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t0 := time.Now()
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m.logf("running ipconfig /registerdns ...")
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cmd := exec.Command("ipconfig", "/registerdns")
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cmd.SysProcAttr = &syscall.SysProcAttr{HideWindow: true}
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d := time.Since(t0).Round(time.Millisecond)
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if err := cmd.Run(); err != nil {
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m.logf("error running ipconfig /registerdns after %v: %v", d, err)
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} else {
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m.logf("ran ipconfig /registerdns in %v", d)
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}
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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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