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Fixed wait for TUN to come up (#1157)

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So, the function waiting for TUN to come up never succeeds:
```
func waitForTUNUp(ch <-chan wgtun.Event) bool {
	t := time.After(time.Second * 5)
	for {
		select {
		case ev := <-ch:
			if ev == wgtun.EventUp {
				return true
			}
		case <-t:
			return false
		}
	}
}
```
I've tried the sleep for one second, and it works flawlessly on several
PCs.

Another point - sometimes, if the service stop abruptly (in case of some
errors) there is an old hidden device in the system, that we need to
uninstall, and then create new.
This commit is contained in:
Revertron 2024-08-06 11:28:15 +02:00 committed by GitHub
parent edf179ed26
commit 5e5de3a343
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GPG Key ID: B5690EEEBB952194
1 changed files with 17 additions and 5 deletions
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22
src/tun/tun_windows.go
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@ -8,10 +8,12 @@ import (
"fmt"
"log"
"net/netip"
"time"
"github.com/yggdrasil-network/yggdrasil-go/src/config"
"golang.org/x/sys/windows"
"golang.zx2c4.com/wintun"
wgtun "golang.zx2c4.com/wireguard/tun"
"golang.zx2c4.com/wireguard/windows/elevate"
"golang.zx2c4.com/wireguard/windows/tunnel/winipcfg"
@ -31,14 +33,23 @@ func (tun *TunAdapter) setup(ifname string, addr string, mtu uint64) error {
if guid, err = windows.GUIDFromString("{8f59971a-7872-4aa6-b2eb-061fc4e9d0a7}"); err != nil {
return err
}
if iface, err = wgtun.CreateTUNWithRequestedGUID(ifname, &guid, int(mtu)); err != nil {
return err
}
if !waitForTUNUp(iface.Events()) {
return fmt.Errorf("TUN did not come up in time")
iface, err = wgtun.CreateTUNWithRequestedGUID(ifname, &guid, int(mtu))
if err != nil {
// Very rare condition, it will purge the old device and create new
tun.log.Printf("Error creating TUN: '%s'", err)
wintun.Uninstall()
time.Sleep(3 * time.Second)
tun.log.Printf("Trying again")
iface, err = wgtun.CreateTUNWithRequestedGUID(ifname, &guid, int(mtu))
if err != nil {
return err
}
}
tun.log.Printf("Waiting for TUN to come up")
time.Sleep(1 * time.Second)
tun.iface = iface
if addr != "" {
tun.log.Printf("Setting up address")
if err = tun.setupAddress(addr); err != nil {
tun.log.Errorln("Failed to set up TUN address:", err)
return err
@ -51,6 +62,7 @@ func (tun *TunAdapter) setup(ifname string, addr string, mtu uint64) error {
if mtu, err := iface.MTU(); err == nil {
tun.mtu = uint64(mtu)
}
tun.log.Printf("TUN is set up successfully")
return nil
})
}