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vsock.go
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vsock.go
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package app
import (
"context"
"io"
"net"
"sync"
"time"
"github.com/Microsoft/go-winio"
"github.com/Microsoft/go-winio/pkg/guid"
"github.com/buptczq/WinCryptSSHAgent/utils"
)
var (
vmWildCard, _ = guid.FromString("00000000-0000-0000-0000-000000000000")
)
// https://docs.microsoft.com/en-us/virtualization/hyper-v-on-windows/user-guide/make-integration-service
//$friendlyName = "WinCryptSSHAgent"
//$service = New-Item -Path "HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Virtualization\GuestCommunicationServices" -Name "22223333-facb-11e6-bd58-64006a7986d3"
//$service.SetValue("ElementName", $friendlyName)
type VSock struct {
running bool
}
type vSockWorker struct {
l net.Listener
handler func(conn io.ReadWriteCloser)
}
func newVSockWorker(vmid string, handler func(conn io.ReadWriteCloser)) (*vSockWorker, error) {
vmidGUID, err := guid.FromString(vmid)
if err != nil {
return nil, err
}
pipe, err := winio.ListenHvsock(&winio.HvsockAddr{
VMID: vmidGUID,
ServiceID: utils.HyperVServiceGUID,
})
if err != nil {
return nil, err
}
return &vSockWorker{
l: pipe,
handler: handler,
}, nil
}
func (s *vSockWorker) Run() {
for {
conn, err := s.l.Accept()
if err != nil {
return
}
go func() {
s.handler(conn)
}()
}
}
func (s *vSockWorker) Close() {
s.l.Close()
}
func vmidDiff(old, new []string) (add, del []string) {
add = make([]string, 0)
del = make([]string, 0)
oldIDS := make(map[string]interface{})
newIDS := make(map[string]interface{})
for _, v := range old {
oldIDS[v] = 0
}
for _, v := range new {
newIDS[v] = 0
}
for _, v := range new {
if _, ok := oldIDS[v]; !ok {
add = append(add, v)
}
}
for _, v := range old {
if _, ok := newIDS[v]; !ok {
del = append(del, v)
}
}
return
}
func (s *VSock) wsl2Watcher(ctx context.Context, handler func(conn io.ReadWriteCloser)) {
timeout := time.Second * 60
ch := make(chan *utils.ProcessEvent, 1)
pn, err := utils.NewProcessNotify("wslhost.exe", ch)
if err != nil {
// fallback to polling mode
timeout = time.Second * 15
println("ProcessNotify error:", err.Error())
} else {
pn.Start()
defer pn.Stop()
}
lastVMIDs := make([]string, 0)
workers := make(map[string]*vSockWorker)
for {
vmids := utils.GetVMIDs()
add, del := vmidDiff(lastVMIDs, vmids)
for _, v := range add {
w, err := newVSockWorker(v, handler)
if err != nil {
continue
}
workers[v] = w
go w.Run()
}
for _, v := range del {
w := workers[v]
if w != nil {
w.Close()
delete(workers, v)
}
}
lastVMIDs = vmids
select {
case <-ctx.Done():
return
case <-ch:
case <-time.After(timeout):
}
}
}
func (s *VSock) Run(ctx context.Context, handler func(conn io.ReadWriteCloser)) error {
isHV := ctx.Value("hv").(bool)
if isHV {
return nil
}
if !utils.CheckHvSocket() {
return nil
}
if !utils.CheckHVService() {
return nil
}
pipe, err := winio.ListenHvsock(&winio.HvsockAddr{
VMID: vmWildCard,
ServiceID: utils.HyperVServiceGUID,
})
if err != nil {
return err
}
s.running = true
defer pipe.Close()
go s.wsl2Watcher(ctx, handler)
wg := new(sync.WaitGroup)
// context cancelled
go func() {
<-ctx.Done()
wg.Wait()
}()
// loop
for {
conn, err := pipe.Accept()
if err != nil {
return nil
}
wg.Add(1)
go func() {
handler(conn)
wg.Done()
}()
}
}
func (*VSock) AppId() AppId {
return APP_HYPERV
}
func (s *VSock) Menu(register func(id AppId, name string, handler func())) {
if !utils.CheckHvSocket() {
return
}
wsl2 := AppId(APP_WSL2)
register(wsl2, "Show WSL2 / Linux On Hyper-V Settings", s.onClick)
register(s.AppId(), "Check Hyper-V Agent Status", s.onCheckClick)
}
func (s *VSock) onClick() {
if !s.running {
s.checkHvService()
return
}
// socat 1.7.4 support vsock,
// `SOCKET-CONNECT` can be replaced with `VSOCK-CONNECT:2:0x22223333`
help := `export SSH_AUTH_SOCK=/tmp/wincrypt-hv.sock
ss -lnx | grep -q $SSH_AUTH_SOCK
if [ $? -ne 0 ]; then
rm -f $SSH_AUTH_SOCK
(setsid nohup socat UNIX-LISTEN:$SSH_AUTH_SOCK,fork SOCKET-CONNECT:40:0:x0000x33332222x02000000x00000000 >/dev/null 2>&1)
fi`
if utils.MessageBox(s.AppId().FullName()+" (OK to copy):", help, utils.MB_OKCANCEL) == utils.IDOK {
utils.SetClipBoard(help)
}
}
func (s *VSock) onCheckClick() {
if !s.running {
s.checkHvService()
return
}
utils.MessageBox(s.AppId().FullName()+":", s.AppId().String()+" agent is working!", 0)
}
func (s *VSock) checkHvService() {
if utils.CheckHVService() {
utils.MessageBox("Error:", s.AppId().String()+" agent doesn't work!", utils.MB_ICONWARNING)
return
}
if utils.MessageBox(s.AppId().FullName()+":", s.AppId().String()+" agent is not working! Do you want to enable it?", utils.MB_OKCANCEL) == utils.IDOK {
if err := utils.RunMeElevatedWithArgs("-i"); err != nil {
utils.MessageBox("Install Service Error:", err.Error(), utils.MB_ICONERROR)
}
}
}