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|
/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2017-2019 WireGuard LLC. All Rights Reserved.
*/
package tunnel
import (
"bufio"
"bytes"
"fmt"
"log"
"net"
"os"
"runtime"
"runtime/debug"
"strings"
"time"
"golang.org/x/sys/windows/svc"
"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/ringlogger"
"golang.zx2c4.com/wireguard/windows/services"
"golang.zx2c4.com/wireguard/windows/tunnel/winipcfg"
"golang.zx2c4.com/wireguard/windows/version"
)
type Service struct {
Path string
}
func (service *Service) 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 routeChangeCallback *winipcfg.RouteChangeCallback
var nativeTun *tun.NativeTun
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 routeChangeCallback != nil {
routeChangeCallback.Unregister()
}
if nativeTun != nil {
unconfigureInterface(nativeTun)
}
if uapi != nil {
uapi.Close()
}
if dev != nil {
dev.Close()
}
stopIt <- true
log.Println("Shutting down")
}()
err = ringlogger.InitGlobalLogger("TUN")
if err != nil {
serviceError = services.ErrorRingloggerOpen
return
}
defer func() {
if x := recover(); x != nil {
for _, line := range append([]string{fmt.Sprint(x)}, strings.Split(string(debug.Stack()), "\n")...) {
if len(strings.TrimSpace(line)) > 0 {
log.Println(line)
}
}
panic(x)
}
}()
conf, err := conf.LoadFromPath(service.Path)
if err != nil {
serviceError = services.ErrorLoadConfiguration
return
}
logPrefix := fmt.Sprintf("[%s] ", conf.Name)
log.SetPrefix(logPrefix)
log.Println("Starting", version.UserAgent())
log.Println("Resolving DNS names")
uapiConf, err := conf.ToUAPI()
if err != nil {
serviceError = services.ErrorDNSLookup
return
}
log.Println("Creating Wintun device")
wintun, err := tun.CreateTUN(conf.Name)
if err != nil {
serviceError = services.ErrorCreateWintun
return
}
log.Println("Determining Wintun device name")
realInterfaceName, err := wintun.Name()
if err != nil {
serviceError = services.ErrorDetermineWintunName
return
}
conf.Name = realInterfaceName
nativeTun = wintun.(*tun.NativeTun)
log.Println("Enabling firewall rules")
err = enableFirewall(conf, nativeTun)
if err != nil {
serviceError = services.ErrorFirewall
return
}
log.Println("Dropping privileges")
err = services.DropAllPrivileges(true)
if err != nil {
serviceError = services.ErrorDropPrivileges
return
}
log.Println("Creating interface instance")
logOutput := log.New(ringlogger.Global, logPrefix, 0)
logger := &device.Logger{logOutput, logOutput, logOutput}
dev = device.NewDevice(wintun, logger)
log.Println("Setting interface configuration")
uapi, err = ipc.UAPIListen(conf.Name)
if err != nil {
serviceError = services.ErrorUAPIListen
return
}
ipcErr := dev.IpcSetOperation(bufio.NewReader(strings.NewReader(uapiConf)))
if ipcErr != nil {
err = ipcErr
serviceError = services.ErrorDeviceSetConfig
return
}
log.Println("Bringing peers up")
dev.Up()
log.Println("Waiting for TCP/IP to attach to interface")
waitForFamilies(nativeTun) // TODO: move this sort of thing into tun/wintun/CreateInterface
log.Println("Monitoring default routes")
routeChangeCallback, err = monitorDefaultRoutes(dev, conf.Interface.MTU == 0, nativeTun)
if err != nil {
serviceError = services.ErrorBindSocketsToDefaultRoutes
return
}
log.Println("Setting device address")
err = configureInterface(conf, nativeTun)
if err != nil {
serviceError = services.ErrorSetNetConfig
return
}
log.Println("Listening for UAPI requests")
go func() {
for {
conn, err := uapi.Accept()
if err != nil {
continue
}
go dev.IpcHandle(conn)
}
}()
changes <- svc.Status{State: svc.Running, Accepts: svc.AcceptStop | svc.AcceptShutdown}
log.Println("Startup complete")
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 <-dev.Wait():
return
}
}
}
|
