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use saved static nameservers stored for the default router interface when doing nameserver discovery

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fix bad logger usages

patch darwin interface name

patch darwin interface name, debugging

make resetDNS check for static config on startup, optionally restoring static confiration as needed

fix netmon logging
This commit is contained in:
Alex
2025-02-18 15:30:02 -05:00
committed by Cuong Manh Le
parent c45f863ed8
commit eff5ff580b
8 changed files with 260 additions and 25 deletions
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23
nameservers_windows.go
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@@ -20,6 +20,7 @@ import (
"github.com/rs/zerolog"
"golang.org/x/sys/windows"
"golang.zx2c4.com/wireguard/windows/tunnel/winipcfg"
"tailscale.com/net/netmon"
)
const (
@@ -303,6 +304,28 @@ func getDNSServers(ctx context.Context) ([]string, error) {
}
}
// if we have static DNS servers saved for the current default route, we should add them to the list
drIfaceName, err := netmon.DefaultRouteInterface()
if err != nil {
Log(context.Background(), logger.Debug(),
"Failed to get default route interface: %v", err)
} else {
drIface, err := net.InterfaceByName(drIfaceName)
if err != nil {
Log(context.Background(), logger.Debug(),
"Failed to get interface by name %s: %v", drIfaceName, err)
} else {
staticNs, file := SavedStaticNameservers(drIface)
Log(context.Background(), logger.Debug(),
"static dns servers from %s: %v", file, staticNs)
if len(staticNs) > 0 {
Log(context.Background(), logger.Debug(),
"Adding static DNS servers from %s: %v", drIfaceName, staticNs)
ns = append(ns, staticNs...)
}
}
}
if len(ns) == 0 {
return nil, fmt.Errorf("no valid DNS servers found")
}