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wgengine/router: tighten isMissingIPv6Err

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So it doesn't false positive if misused.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2020-09-11 20:02:00 -07:00 committed by Brad Fitzpatrick
parent 8f5b52e571
commit 7e9d1f7808
1 changed files with 12 additions and 6 deletions
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18
wgengine/router/ifconfig_windows.go
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@ -11,6 +11,7 @@ import (
"fmt"
"log"
"net"
"os"
"sort"
"time"
@ -366,13 +367,18 @@ func configureInterface(cfg *Config, tun *tun.NativeTun) error {
// isMissingIPv6Err reports whether err is due to IPv6 not being enabled on the machine.
//
// It's intended for use on errors returned by the winipcfg.Interface.GetIpInterface
// method, which ultimately calls:
// https://docs.microsoft.com/en-us/windows/win32/api/netioapi/nf-netioapi-getipinterfaceentry
// It only currently supports the errors returned by winipcfg.Interface.GetIpInterface.
func isMissingIPv6Err(err error) bool {
// ERROR_NOT_FOUND from means the address family (IPv6) is not found.
// (ERROR_FILE_NOT_FOUND means that the interface doesn't exist.)
return errors.Is(err, windows.ERROR_NOT_FOUND)
if se, ok := err.(*os.SyscallError); ok {
switch se.Syscall {
case "iphlpapi.GetIpInterfaceEntry":
// ERROR_NOT_FOUND from means the address family (IPv6) is not found.
// (ERROR_FILE_NOT_FOUND means that the interface doesn't exist.)
// https://docs.microsoft.com/en-us/windows/win32/api/netioapi/nf-netioapi-getipinterfaceentry
return se.Err == windows.ERROR_NOT_FOUND
}
}
return false
}
// routeLess reports whether ri should sort before rj.