mirror of
https://github.com/tailscale/tailscale.git
synced 2024-11-27 03:55:36 +00:00
71029cea2d
This updates all source files to use a new standard header for copyright and license declaration. Notably, copyright no longer includes a date, and we now use the standard SPDX-License-Identifier header. This commit was done almost entirely mechanically with perl, and then some minimal manual fixes. Updates #6865 Signed-off-by: Will Norris <will@tailscale.com>
110 lines
2.7 KiB
Go
110 lines
2.7 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
|
|
// SPDX-License-Identifier: BSD-3-Clause
|
|
|
|
package tstun
|
|
|
|
import (
|
|
"fmt"
|
|
"sync"
|
|
"time"
|
|
|
|
"github.com/tailscale/wireguard-go/tun"
|
|
"golang.zx2c4.com/wireguard/windows/tunnel/winipcfg"
|
|
"tailscale.com/types/logger"
|
|
)
|
|
|
|
// ifaceWatcher waits for an interface to be up.
|
|
type ifaceWatcher struct {
|
|
logf logger.Logf
|
|
luid winipcfg.LUID
|
|
|
|
mu sync.Mutex // guards following
|
|
done bool
|
|
sig chan bool
|
|
}
|
|
|
|
// callback is the callback we register with Windows to call when IP interface changes.
|
|
func (iw *ifaceWatcher) callback(notificationType winipcfg.MibNotificationType, iface *winipcfg.MibIPInterfaceRow) {
|
|
// Probably should check only when MibParameterNotification, but just in case included MibAddInstance also.
|
|
if notificationType == winipcfg.MibParameterNotification || notificationType == winipcfg.MibAddInstance {
|
|
// Out of paranoia, start a goroutine to finish our work, to return to Windows out of this callback.
|
|
go iw.isUp()
|
|
}
|
|
}
|
|
|
|
func (iw *ifaceWatcher) isUp() bool {
|
|
iw.mu.Lock()
|
|
defer iw.mu.Unlock()
|
|
|
|
if iw.done {
|
|
// We already know that it's up
|
|
return true
|
|
}
|
|
|
|
if iw.getOperStatus() != winipcfg.IfOperStatusUp {
|
|
return false
|
|
}
|
|
|
|
iw.done = true
|
|
iw.sig <- true
|
|
return true
|
|
}
|
|
|
|
func (iw *ifaceWatcher) getOperStatus() winipcfg.IfOperStatus {
|
|
ifc, err := iw.luid.Interface()
|
|
if err != nil {
|
|
iw.logf("iw.luid.Interface error: %v", err)
|
|
return 0
|
|
}
|
|
return ifc.OperStatus
|
|
}
|
|
|
|
func waitInterfaceUp(iface tun.Device, timeout time.Duration, logf logger.Logf) error {
|
|
iw := &ifaceWatcher{
|
|
luid: winipcfg.LUID(iface.(*tun.NativeTun).LUID()),
|
|
logf: logger.WithPrefix(logf, "waitInterfaceUp: "),
|
|
}
|
|
|
|
// Just in case check the status first
|
|
if iw.getOperStatus() == winipcfg.IfOperStatusUp {
|
|
iw.logf("TUN interface already up; no need to wait")
|
|
return nil
|
|
}
|
|
|
|
iw.sig = make(chan bool, 1)
|
|
cb, err := winipcfg.RegisterInterfaceChangeCallback(iw.callback)
|
|
if err != nil {
|
|
iw.logf("RegisterInterfaceChangeCallback error: %v", err)
|
|
return err
|
|
}
|
|
defer cb.Unregister()
|
|
|
|
t0 := time.Now()
|
|
expires := t0.Add(timeout)
|
|
ticker := time.NewTicker(10 * time.Second)
|
|
defer ticker.Stop()
|
|
|
|
for {
|
|
iw.logf("waiting for TUN interface to come up...")
|
|
|
|
select {
|
|
case <-iw.sig:
|
|
iw.logf("TUN interface is up after %v", time.Since(t0))
|
|
return nil
|
|
case <-ticker.C:
|
|
}
|
|
|
|
if iw.isUp() {
|
|
// Very unlikely to happen - either NotifyIpInterfaceChange doesn't work
|
|
// or it came up in the same moment as tick. Indicate this in the log message.
|
|
iw.logf("TUN interface is up after %v (on poll, without notification)", time.Since(t0))
|
|
return nil
|
|
}
|
|
|
|
if expires.Before(time.Now()) {
|
|
iw.logf("timeout waiting %v for TUN interface to come up", timeout)
|
|
return fmt.Errorf("timeout waiting for TUN interface to come up")
|
|
}
|
|
}
|
|
}
|