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tun: linux: do not spam events every second from hack listener 

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2021-03-11 09:23:11 -07:00
parent 6005c573e2
commit c5f382624e
1 changed files with 17 additions and 6 deletions
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23
tun/tun_linux.go
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@ -55,6 +55,11 @@ func (tun *NativeTun) routineHackListener() {
/* This is needed for the detection to work across network namespaces
* If you are reading this and know a better method, please get in touch.
*/
last := 0
const (
up = 1
down = 2
)
for {
sysconn, err := tun.tunFile.SyscallConn()
if err != nil {
@ -68,13 +73,19 @@ func (tun *NativeTun) routineHackListener() {
}
switch err {
case unix.EINVAL:
// If the tunnel is up, it reports that write() is
// allowed but we provided invalid data.
tun.events <- EventUp
if last != up {
// If the tunnel is up, it reports that write() is
// allowed but we provided invalid data.
tun.events <- EventUp
last = up
}
case unix.EIO:
// If the tunnel is down, it reports that no I/O
// is possible, without checking our provided data.
tun.events <- EventDown
if last != down {
// If the tunnel is down, it reports that no I/O
// is possible, without checking our provided data.
tun.events <- EventDown
last = down
}
default:
return
}