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|
/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2019-2021 WireGuard LLC. All Rights Reserved.
*/
package tunnel
import (
"bytes"
"fmt"
"log"
"net"
"os"
"runtime"
"time"
"golang.org/x/sys/windows"
"golang.org/x/sys/windows/svc"
"golang.org/x/sys/windows/svc/mgr"
"golang.zx2c4.com/wireguard/conn"
"golang.zx2c4.com/wireguard/device"
"golang.zx2c4.com/wireguard/ipc"
"golang.zx2c4.com/wireguard/tun"
"golang.zx2c4.com/wireguard/windows/conf"
"golang.zx2c4.com/wireguard/windows/driver"
"golang.zx2c4.com/wireguard/windows/elevate"
"golang.zx2c4.com/wireguard/windows/ringlogger"
"golang.zx2c4.com/wireguard/windows/services"
"golang.zx2c4.com/wireguard/windows/tunnel/winipcfg"
"golang.zx2c4.com/wireguard/windows/version"
)
type tunnelService struct {
Path string
}
func (service *tunnelService) Execute(args []string, r <-chan svc.ChangeRequest, changes chan<- svc.Status) (svcSpecificEC bool, exitCode uint32) {
changes <- svc.Status{State: svc.StartPending}
var dev *device.Device
var uapi net.Listener
var watcher *interfaceWatcher
var nativeTun *tun.NativeTun
var wintun tun.Device
var adapter *driver.Adapter
var luid winipcfg.LUID
var config *conf.Config
var err error
serviceError := services.ErrorSuccess
defer func() {
svcSpecificEC, exitCode = services.DetermineErrorCode(err, serviceError)
logErr := services.CombineErrors(err, serviceError)
if logErr != nil {
log.Println(logErr)
}
changes <- svc.Status{State: svc.StopPending}
stopIt := make(chan bool, 1)
go func() {
t := time.NewTicker(time.Second * 30)
for {
select {
case <-t.C:
t.Stop()
buf := make([]byte, 1024)
for {
n := runtime.Stack(buf, true)
if n < len(buf) {
buf = buf[:n]
break
}
buf = make([]byte, 2*len(buf))
}
lines := bytes.Split(buf, []byte{'\n'})
log.Println("Failed to shutdown after 30 seconds. Probably dead locked. Printing stack and killing.")
for _, line := range lines {
if len(bytes.TrimSpace(line)) > 0 {
log.Println(string(line))
}
}
os.Exit(777)
return
case <-stopIt:
t.Stop()
return
}
}
}()
if logErr == nil && dev != nil && config != nil {
logErr = runScriptCommand(config.Interface.PreDown, config.Name)
}
if watcher != nil {
watcher.Destroy()
}
if uapi != nil {
uapi.Close()
}
if dev != nil {
dev.Close()
}
if logErr == nil && dev != nil && config != nil {
_ = runScriptCommand(config.Interface.PostDown, config.Name)
}
stopIt <- true
log.Println("Shutting down")
}()
err = ringlogger.InitGlobalLogger("TUN")
if err != nil {
serviceError = services.ErrorRingloggerOpen
return
}
config, err = conf.LoadFromPath(service.Path)
if err != nil {
serviceError = services.ErrorLoadConfiguration
return
}
config.DeduplicateNetworkEntries()
err = CopyConfigOwnerToIPCSecurityDescriptor(service.Path)
if err != nil {
serviceError = services.ErrorLoadConfiguration
return
}
log.SetPrefix(fmt.Sprintf("[%s] ", config.Name))
log.Println("Starting", version.UserAgent())
if m, err := mgr.Connect(); err == nil {
if lockStatus, err := m.LockStatus(); err == nil && lockStatus.IsLocked {
/* If we don't do this, then the driver installation will block forever, because
* installing a network adapter starts the driver service too. Apparently at boot time,
* Windows 8.1 locks the SCM for each service start, creating a deadlock if we don't
* announce that we're running before starting additional services.
*/
log.Printf("SCM locked for %v by %s, marking service as started", lockStatus.Age, lockStatus.Owner)
changes <- svc.Status{State: svc.Running}
}
m.Disconnect()
}
log.Println("Watching network interfaces")
watcher, err = watchInterface()
if err != nil {
serviceError = services.ErrorSetNetConfig
return
}
log.Println("Resolving DNS names")
err = config.ResolveEndpoints()
if err != nil {
serviceError = services.ErrorDNSLookup
return
}
log.Println("Creating network adapter")
if conf.AdminBool("ExperimentalKernelDriver") {
// Does an adapter with this name already exist?
adapter, err = driver.DefaultPool.OpenAdapter(config.Name)
if err == nil {
// If so, we delete it, in case it has weird residual configuration.
_, err = adapter.Delete()
if err != nil {
err = fmt.Errorf("Error deleting already existing adapter: %w", err)
serviceError = services.ErrorCreateNetworkAdapter
return
}
}
for i := 0; i < 5; i++ {
if i > 0 {
time.Sleep(time.Second)
log.Printf("Retrying adapter creation after failure because system just booted (T+%v): %v", windows.DurationSinceBoot(), err)
}
var rebootRequired bool
adapter, rebootRequired, err = driver.DefaultPool.CreateAdapter(config.Name, deterministicGUID(config))
if err == nil || windows.DurationSinceBoot() > time.Minute*4 {
if rebootRequired {
log.Println("Windows indicated a reboot is required.")
}
break
}
}
if err != nil {
err = fmt.Errorf("Error creating adapter: %w", err)
serviceError = services.ErrorCreateNetworkAdapter
return
}
defer adapter.Delete()
luid = adapter.LUID()
driverVersion, err := driver.RunningVersion()
if err != nil {
log.Printf("Warning: unable to determine driver version: %v", err)
} else {
log.Printf("Using WireGuardNT/%d.%d", (driverVersion>>16)&0xffff, driverVersion&0xffff)
}
err = adapter.SetLogging(driver.AdapterLogOn)
if err != nil {
err = fmt.Errorf("Error enabling adapter logging: %w", err)
serviceError = services.ErrorCreateNetworkAdapter
return
}
} else {
for i := 0; i < 5; i++ {
if i > 0 {
time.Sleep(time.Second)
log.Printf("Retrying adapter creation after failure because system just booted (T+%v): %v", windows.DurationSinceBoot(), err)
}
wintun, err = tun.CreateTUNWithRequestedGUID(config.Name, deterministicGUID(config), 0)
if err == nil || windows.DurationSinceBoot() > time.Minute*4 {
break
}
}
if err != nil {
serviceError = services.ErrorCreateNetworkAdapter
return
}
nativeTun = wintun.(*tun.NativeTun)
luid = winipcfg.LUID(nativeTun.LUID())
driverVersion, err := nativeTun.RunningVersion()
if err != nil {
log.Printf("Warning: unable to determine driver version: %v", err)
} else {
log.Printf("Using Wintun/%d.%d", (driverVersion>>16)&0xffff, driverVersion&0xffff)
}
}
err = runScriptCommand(config.Interface.PreUp, config.Name)
if err != nil {
serviceError = services.ErrorRunScript
return
}
err = enableFirewall(config, luid)
if err != nil {
serviceError = services.ErrorFirewall
return
}
log.Println("Dropping privileges")
err = elevate.DropAllPrivileges(true)
if err != nil {
serviceError = services.ErrorDropPrivileges
return
}
if nativeTun != nil {
log.Println("Creating interface instance")
bind := conn.NewDefaultBind()
dev = device.NewDevice(wintun, bind, &device.Logger{log.Printf, log.Printf})
log.Println("Setting interface configuration")
uapi, err = ipc.UAPIListen(config.Name)
if err != nil {
serviceError = services.ErrorUAPIListen
return
}
err = dev.IpcSet(config.ToUAPI())
if err != nil {
serviceError = services.ErrorDeviceSetConfig
return
}
log.Println("Bringing peers up")
dev.Up()
var clamper mtuClamper
clamper = nativeTun
watcher.Configure(bind.(conn.BindSocketToInterface), clamper, config, luid)
log.Println("Listening for UAPI requests")
go func() {
for {
conn, err := uapi.Accept()
if err != nil {
continue
}
go dev.IpcHandle(conn)
}
}()
} else {
err = adapter.SetConfiguration(config.ToDriverConfiguration())
if err != nil {
serviceError = services.ErrorDeviceSetConfig
}
err = adapter.SetAdapterState(driver.AdapterStateUp)
if err != nil {
serviceError = services.ErrorDeviceBringUp
}
watcher.Configure(nil, nil, config, luid)
}
err = runScriptCommand(config.Interface.PostUp, config.Name)
if err != nil {
serviceError = services.ErrorRunScript
return
}
changes <- svc.Status{State: svc.Running, Accepts: svc.AcceptStop | svc.AcceptShutdown}
log.Println("Startup complete")
var devWaitChan chan struct{}
if dev != nil {
devWaitChan = dev.Wait()
} else {
devWaitChan = make(chan struct{})
}
for {
select {
case c := <-r:
switch c.Cmd {
case svc.Stop, svc.Shutdown:
return
case svc.Interrogate:
changes <- c.CurrentStatus
default:
log.Printf("Unexpected service control request #%d\n", c)
}
case <-devWaitChan:
return
case e := <-watcher.errors:
serviceError, err = e.serviceError, e.err
return
}
}
}
func Run(confPath string) error {
name, err := conf.NameFromPath(confPath)
if err != nil {
return err
}
serviceName, err := services.ServiceNameOfTunnel(name)
if err != nil {
return err
}
return svc.Run(serviceName, &tunnelService{confPath})
}
|