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tun: make NativeTun.Close well behaved, not crash on double close

Browse Source 
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2021-02-18 14:53:22 -08:00 committed by Jason A. Donenfeld
parent fecb8f482a
commit 0f4809f366
5 changed files with 62 additions and 43 deletions
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20
tun/tun_darwin.go
View File

@ -10,6 +10,7 @@ import (
"fmt"
"net"
"os"
"sync"
"syscall"
"time"
"unsafe"
@ -26,6 +27,7 @@ type NativeTun struct {
events chan Event
errors chan error
routeSocket int
closeOnce sync.Once
}
func retryInterfaceByIndex(index int) (iface *net.Interface, err error) {
@ -256,14 +258,16 @@ func (tun *NativeTun) Flush() error {
}
func (tun *NativeTun) Close() error {
var err2 error
err1 := tun.tunFile.Close()
if tun.routeSocket != -1 {
unix.Shutdown(tun.routeSocket, unix.SHUT_RDWR)
err2 = unix.Close(tun.routeSocket)
} else if tun.events != nil {
close(tun.events)
}
var err1, err2 error
tun.closeOnce.Do(func() {
err1 = tun.tunFile.Close()
if tun.routeSocket != -1 {
unix.Shutdown(tun.routeSocket, unix.SHUT_RDWR)
err2 = unix.Close(tun.routeSocket)
} else if tun.events != nil {
close(tun.events)
}
})
if err1 != nil {
return err1
}

24
tun/tun_freebsd.go
View File

@ -11,6 +11,7 @@ import (
"fmt"
"net"
"os"
"sync"
"syscall"
"unsafe"
@ -82,6 +83,7 @@ type NativeTun struct {
events chan Event
errors chan error
routeSocket int
closeOnce sync.Once
}
func (tun *NativeTun) routineRouteListener(tunIfindex int) {
@ -472,16 +474,18 @@ func (tun *NativeTun) Flush() error {
}
func (tun *NativeTun) Close() error {
var err3 error
err1 := tun.tunFile.Close()
err2 := tunDestroy(tun.name)
if tun.routeSocket != -1 {
unix.Shutdown(tun.routeSocket, unix.SHUT_RDWR)
err3 = unix.Close(tun.routeSocket)
tun.routeSocket = -1
} else if tun.events != nil {
close(tun.events)
}
var err1, err2, err3 error
tun.closeOnce.Do(func() {
err1 = tun.tunFile.Close()
err2 = tunDestroy(tun.name)
if tun.routeSocket != -1 {
unix.Shutdown(tun.routeSocket, unix.SHUT_RDWR)
err3 = unix.Close(tun.routeSocket)
tun.routeSocket = -1
} else if tun.events != nil {
close(tun.events)
}
})
if err1 != nil {
return err1
}

23
tun/tun_linux.go
View File

@ -39,6 +39,8 @@ type NativeTun struct {
hackListenerClosed sync.Mutex
statusListenersShutdown chan struct{}
closeOnce sync.Once
nameOnce sync.Once // guards calling initNameCache, which sets following fields
nameCache string // name of interface
nameErr error
@ -372,17 +374,18 @@ func (tun *NativeTun) Events() chan Event {
}
func (tun *NativeTun) Close() error {
var err1 error
if tun.statusListenersShutdown != nil {
close(tun.statusListenersShutdown)
if tun.netlinkCancel != nil {
err1 = tun.netlinkCancel.Cancel()
var err1, err2 error
tun.closeOnce.Do(func() {
if tun.statusListenersShutdown != nil {
close(tun.statusListenersShutdown)
if tun.netlinkCancel != nil {
err1 = tun.netlinkCancel.Cancel()
}
} else if tun.events != nil {
close(tun.events)
}
} else if tun.events != nil {
close(tun.events)
}
err2 := tun.tunFile.Close()
err2 = tun.tunFile.Close()
})
if err1 != nil {
return err1
}

22
tun/tun_openbsd.go
View File

@ -10,6 +10,7 @@ import (
"fmt"
"net"
"os"
"sync"
"syscall"
"unsafe"
@ -32,6 +33,7 @@ type NativeTun struct {
events chan Event
errors chan error
routeSocket int
closeOnce sync.Once
}
func (tun *NativeTun) routineRouteListener(tunIfindex int) {
@ -245,15 +247,17 @@ func (tun *NativeTun) Flush() error {
}
func (tun *NativeTun) Close() error {
var err2 error
err1 := tun.tunFile.Close()
if tun.routeSocket != -1 {
unix.Shutdown(tun.routeSocket, unix.SHUT_RDWR)
err2 = unix.Close(tun.routeSocket)
tun.routeSocket = -1
} else if tun.events != nil {
close(tun.events)
}
var err1, err2 error
tun.closeOnce.Do(func() {
err1 = tun.tunFile.Close()
if tun.routeSocket != -1 {
unix.Shutdown(tun.routeSocket, unix.SHUT_RDWR)
err2 = unix.Close(tun.routeSocket)
tun.routeSocket = -1
} else if tun.events != nil {
close(tun.events)
}
})
if err1 != nil {
return err1
}

16
tun/tun_windows.go
View File

@ -10,6 +10,7 @@ import (
"fmt"
"log"
"os"
"sync"
"sync/atomic"
"time"
_ "unsafe"
@ -42,6 +43,7 @@ type NativeTun struct {
rate rateJuggler
session wintun.Session
readWait windows.Handle
closeOnce sync.Once
}
var WintunPool, _ = wintun.MakePool("WireGuard")
@ -122,13 +124,15 @@ func (tun *NativeTun) Events() chan Event {
}
func (tun *NativeTun) Close() error {
tun.close = true
tun.session.End()
var err error
if tun.wt != nil {
_, err = tun.wt.Delete(false)
}
close(tun.events)
tun.closeOnce.Do(func() {
tun.close = true
tun.session.End()
if tun.wt != nil {
_, err = tun.wt.Delete(false)
}
close(tun.events)
})
return err
}