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wintun: quickly ignore non-Wintun devices

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Some devices take ~2 seconds to enumerate on Windows if we try to get
their instance name.  The hardware id property, on the other hand,
is available right away.

Signed-off-by: Avery Pennarun <apenwarr@gmail.com>
[zx2c4: inlined this to where it makes sense, reused setupapi const]
This commit is contained in:
Avery Pennarun 2019-04-05 02:26:40 -04:00 committed by Jason A. Donenfeld
parent 1b6c8ddbe8
commit c85e4a410f
1 changed files with 18 additions and 0 deletions
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18
tun/wintun/wintun_windows.go
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@ -131,6 +131,15 @@ func (pool Pool) GetInterface(ifname string) (*Interface, error) {
continue continue
} }
// Check the Hardware ID to make sure it's a real Wintun device first. This avoids doing slow operations on non-Wintun devices.
property, err := devInfoList.DeviceRegistryProperty(deviceData, setupapi.SPDRP_HARDWAREID)
if err != nil {
continue
}
if hwids, ok := property.([]string); ok && len(hwids) > 0 && hwids[0] != hardwareID {
continue
}
wintun, err := makeWintun(devInfoList, deviceData, pool) wintun, err := makeWintun(devInfoList, deviceData, pool)
if err != nil { if err != nil {
continue continue
@ -494,6 +503,15 @@ func (pool Pool) DeleteMatchingInterfaces(matches func(wintun *Interface) bool)
continue continue
} }
// Check the Hardware ID to make sure it's a real Wintun device first. This avoids doing slow operations on non-Wintun devices.
property, err := devInfoList.DeviceRegistryProperty(deviceData, setupapi.SPDRP_HARDWAREID)
if err != nil {
continue
}
if hwids, ok := property.([]string); ok && len(hwids) > 0 && hwids[0] != hardwareID {
continue
}
err = devInfoList.BuildDriverInfoList(deviceData, setupapi.SPDIT_COMPATDRIVER) err = devInfoList.BuildDriverInfoList(deviceData, setupapi.SPDIT_COMPATDRIVER)
if err != nil { if err != nil {
continue continue