mirror of
https://github.com/tailscale/tailscale.git
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2b2a16d9a2
The windows key timeout is longer than the wgengine watchdog timeout, which means we never reach the timeout, instead the process exits. Reduce the timeout so if we do hit it, at least the process continues. Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
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 = 20 * time.Second
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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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