Update newt

feat(DNS): Add static cleanup funcs

.github/CODEOWNERS

@@ -0,0 +1 @@
+* @oschwartz10612 @miloschwartz

README.md

@@ -1,4 +1,5 @@
 # Olm
+Olm is being phased out in favor of the [Pangolin CLI](https://github.com/fosrl/cli) and is only meant for advanced use cases.
 
 Olm is a [WireGuard](https://www.wireguard.com/) tunnel client designed to securely connect your computer to Newt sites running on remote networks.
 

dns/override/dns_override_android.go

@@ -14,3 +14,9 @@ func SetupDNSOverride(interfaceName string, proxyIp netip.Addr) error {
 func RestoreDNSOverride() error {
 	return nil
 }
+
+// CleanupStaleState is a no-op on Android as DNS configuration is handled by the VpnService API
+func CleanupStaleState(interfaceName string) error {
+	_ = interfaceName
+	return nil
+}

dns/override/dns_override_darwin.go

@@ -61,3 +61,20 @@ func RestoreDNSOverride() error {
 	logger.Info("DNS configuration restored successfully")
 	return nil
 }
+
+// CleanupStaleState removes any stale DNS configuration left over from a previous
+// unclean shutdown (e.g., system crash, power loss while tunnel was active).
+// This function should be called early during startup, before any network operations,
+// to ensure DNS is working properly.
+//
+// On macOS, this cleans up any scutil DNS keys that were created but not removed.
+func CleanupStaleState(interfaceName string) error {
+	_ = interfaceName
+	if err := platform.CleanupStaleDarwinDNS(); err != nil {
+		logger.Warn("Failed to cleanup stale Darwin DNS config: %v", err)
+		return fmt.Errorf("Darwin DNS cleanup: %w", err)
+	}
+
+	logger.Info("Stale DNS state cleanup completed successfully")
+	return nil
+}

dns/override/dns_override_ios.go

@@ -13,3 +13,9 @@ func SetupDNSOverride(interfaceName string, proxyIp netip.Addr) error {
 func RestoreDNSOverride() error {
 	return nil
 }
+
+// CleanupStaleState is a no-op on iOS as DNS configuration is handled by the system
+func CleanupStaleState(interfaceName string) error {
+	_ = interfaceName
+	return nil
+}

dns/override/dns_override_unix.go

@@ -98,3 +98,49 @@ func RestoreDNSOverride() error {
 	logger.Info("DNS configuration restored successfully")
 	return nil
 }
+
+// CleanupStaleState removes any stale DNS configuration left over from a previous
+// unclean shutdown (e.g., system crash, power loss while tunnel was active).
+// This function should be called early during startup, before any network operations,
+// to ensure DNS is working properly.
+//
+// It checks and cleans up stale state from all supported DNS managers:
+// - NetworkManager: removes /etc/NetworkManager/conf.d/olm-dns.conf
+// - resolvconf: removes entry for the provided interface
+// - File-based: restores /etc/resolv.conf from backup if it exists
+//
+// This is safe to call even if no stale state exists.
+func CleanupStaleState(interfaceName string) error {
+	var errs []error
+
+	// Clean up NetworkManager stale config
+	if err := platform.CleanupStaleNetworkManagerDNS(); err != nil {
+		logger.Warn("Failed to cleanup stale NetworkManager DNS config: %v", err)
+		errs = append(errs, fmt.Errorf("NetworkManager cleanup: %w", err))
+	} else {
+		logger.Debug("NetworkManager DNS cleanup completed")
+	}
+
+	// Clean up resolvconf stale entries for the provided interface
+	if err := platform.CleanupStaleResolvconfDNS(interfaceName); err != nil {
+		logger.Warn("Failed to cleanup stale resolvconf DNS config: %v", err)
+		errs = append(errs, fmt.Errorf("resolvconf cleanup: %w", err))
+	} else {
+		logger.Debug("resolvconf DNS cleanup completed")
+	}
+
+	// Clean up file-based stale backup
+	if err := platform.CleanupStaleFileDNS(); err != nil {
+		logger.Warn("Failed to cleanup stale file-based DNS config: %v", err)
+		errs = append(errs, fmt.Errorf("file DNS cleanup: %w", err))
+	} else {
+		logger.Debug("File-based DNS cleanup completed")
+	}
+
+	if len(errs) > 0 {
+		return fmt.Errorf("some DNS cleanup operations failed: %v", errs)
+	}
+
+	logger.Info("Stale DNS state cleanup completed successfully")
+	return nil
+}

dns/override/dns_override_windows.go

@@ -61,3 +61,19 @@ func RestoreDNSOverride() error {
 	logger.Info("DNS configuration restored successfully")
 	return nil
 }
+
+// CleanupStaleState removes any stale DNS configuration left over from a previous
+// unclean shutdown (e.g., system crash, power loss while tunnel was active).
+// This function should be called early during startup, before any network operations,
+// to ensure DNS is working properly.
+//
+// On Windows, DNS configuration is tied to the interface GUID. When the WireGuard
+// interface is recreated, it gets a new GUID, so there's no stale state to clean up.
+func CleanupStaleState(interfaceName string) error {
+	// Windows DNS configuration via registry is interface-specific.
+	// When the WireGuard interface is recreated, it gets a new GUID,
+	// so there's no leftover state to clean up from previous sessions.
+	_ = interfaceName
+	logger.Debug("Windows DNS cleanup: no stale state to clean (interface-specific)")
+	return nil
+}

dns/platform/darwin.go

@@ -417,3 +417,59 @@ func (d *DarwinDNSConfigurator) clearState() error {
 	logger.Debug("Cleared DNS state file")
 	return nil
 }
+
+// CleanupStaleDarwinDNS removes any stale DNS configuration left by the Darwin
+// configurator from a previous unclean shutdown. This is a static function that can be
+// called without creating a configurator instance, useful for cleanup before network operations.
+func CleanupStaleDarwinDNS() error {
+	stateFilePath := getDNSStateFilePath()
+
+	// Check if state file exists
+	data, err := os.ReadFile(stateFilePath)
+	if err != nil {
+		if os.IsNotExist(err) {
+			// No state file, nothing to clean up
+			return nil
+		}
+		return fmt.Errorf("read state file: %w", err)
+	}
+
+	var state DNSPersistentState
+	if err := json.Unmarshal(data, &state); err != nil {
+		// Invalid state file, remove it
+		os.Remove(stateFilePath)
+		return nil
+	}
+
+	if len(state.CreatedKeys) == 0 {
+		// No keys to clean up
+		return nil
+	}
+
+	logger.Info("Found DNS state from previous session, cleaning up %d keys", len(state.CreatedKeys))
+
+	// Remove all keys from previous session using scutil directly
+	for _, key := range state.CreatedKeys {
+		logger.Debug("Removing leftover DNS key: %s", key)
+		cmd := fmt.Sprintf("open\nremove %s\nquit\n", key)
+		scutilCmd := exec.Command(scutilPath)
+		scutilCmd.Stdin = strings.NewReader(cmd)
+		if err := scutilCmd.Run(); err != nil {
+			logger.Warn("Failed to remove DNS key %s: %v", key, err)
+		}
+	}
+
+	// Clear state file
+	if err := os.Remove(stateFilePath); err != nil && !os.IsNotExist(err) {
+		logger.Warn("Failed to clear DNS state file: %v", err)
+	}
+
+	// Flush DNS cache after cleanup
+	cacheCmd := exec.Command(dscacheutilPath, "-flushcache")
+	_ = cacheCmd.Run()
+
+	killCmd := exec.Command("killall", "-HUP", "mDNSResponder")
+	_ = killCmd.Run()
+
+	return nil
+}

dns/platform/file.go

@@ -218,3 +218,27 @@ func copyFile(src, dst string) error {
 
 	return nil
 }
+
+// CleanupStaleFileDNS removes any stale DNS configuration left by the file-based
+// configurator from a previous unclean shutdown. This is a static function that can be
+// called without creating a configurator instance, useful for cleanup before network operations.
+func CleanupStaleFileDNS() error {
+	// Check if backup file exists from a previous session
+	if _, err := os.Stat(resolvConfBackupPath); os.IsNotExist(err) {
+		// No backup file, nothing to clean up
+		return nil
+	}
+
+	// A backup exists, which means we crashed while DNS was configured
+	// Restore the original resolv.conf
+	if err := copyFile(resolvConfBackupPath, resolvConfPath); err != nil {
+		return fmt.Errorf("restore from backup during cleanup: %w", err)
+	}
+
+	// Remove backup file
+	if err := os.Remove(resolvConfBackupPath); err != nil {
+		return fmt.Errorf("remove backup file during cleanup: %w", err)
+	}
+
+	return nil
+}

dns/platform/network_manager.go

@@ -323,3 +323,41 @@ func GetNetworkManagerVersion() (string, error) {
 
 	return version, nil
 }
+
+// CleanupStaleNetworkManagerDNS removes any stale DNS configuration left by NetworkManager
+// configurator from a previous unclean shutdown. This is a static function that can be called
+// without creating a configurator instance, useful for cleanup before network operations.
+func CleanupStaleNetworkManagerDNS() error {
+	confPath := networkManagerConfDir + "/" + networkManagerDNSConfFile
+
+	// Check if our config file exists from a previous session
+	if _, err := os.Stat(confPath); os.IsNotExist(err) {
+		// No config file, nothing to clean up
+		return nil
+	}
+
+	// Remove the stale configuration file
+	if err := os.Remove(confPath); err != nil && !os.IsNotExist(err) {
+		return fmt.Errorf("remove stale DNS config file: %w", err)
+	}
+
+	// Try to reload NetworkManager if it's available
+	if IsNetworkManagerAvailable() {
+		conn, err := dbus.SystemBus()
+		if err != nil {
+			return fmt.Errorf("connect to system bus for reload: %w", err)
+		}
+		defer conn.Close()
+
+		obj := conn.Object(networkManagerDest, networkManagerDbusObjectNode)
+
+		ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+		defer cancel()
+
+		if err := obj.CallWithContext(ctx, networkManagerDest+".Reload", 0, uint32(0)).Store(); err != nil {
+			return fmt.Errorf("reload NetworkManager after cleanup: %w", err)
+		}
+	}
+
+	return nil
+}

dns/platform/resolvconf.go

@@ -219,3 +219,37 @@ func IsResolvconfAvailable() bool {
 	cmd := exec.Command(resolvconfCommand, "--version")
 	return cmd.Run() == nil
 }
+
+// CleanupStaleResolvconfDNS removes any stale DNS configuration left by the resolvconf
+// configurator from a previous unclean shutdown. This is a static function that can be
+// called without creating a configurator instance, useful for cleanup before network operations.
+// The interfaceName parameter specifies which interface entry to clean up (typically "olm").
+func CleanupStaleResolvconfDNS(interfaceName string) error {
+	if !IsResolvconfAvailable() {
+		// resolvconf not available, nothing to clean up
+		return nil
+	}
+
+	// Detect resolvconf implementation type
+	implType, err := detectResolvconfType()
+	if err != nil {
+		// Can't detect type, try default
+		implType = "resolvconf"
+	}
+
+	// Try to delete any existing entry for this interface
+	// This is idempotent - if no entry exists, resolvconf will just return success
+	var cmd *exec.Cmd
+
+	switch implType {
+	case "openresolv":
+		cmd = exec.Command(resolvconfCommand, "-f", "-d", interfaceName)
+	default:
+		cmd = exec.Command(resolvconfCommand, "-d", interfaceName)
+	}
+
+	// Ignore errors - the entry may not exist, which is fine
+	_ = cmd.Run()
+
+	return nil
+}

go.mod

@@ -4,11 +4,11 @@ go 1.25.0
 
 require (
 	github.com/Microsoft/go-winio v0.6.2
-	github.com/fosrl/newt v1.10.3
+	github.com/fosrl/newt v1.12.0
 	github.com/godbus/dbus/v5 v5.2.2
 	github.com/gorilla/websocket v1.5.3
 	github.com/miekg/dns v1.1.70
-	golang.org/x/sys v0.41.0
+	golang.org/x/sys v0.42.0
 	golang.zx2c4.com/wireguard v0.0.0-20250521234502-f333402bd9cb
 	golang.zx2c4.com/wireguard/wgctrl v0.0.0-20241231184526-a9ab2273dd10
 	gvisor.dev/gvisor v0.0.0-20250503011706-39ed1f5ac29c
@@ -20,13 +20,13 @@ require (
 	github.com/google/go-cmp v0.7.0 // indirect
 	github.com/vishvananda/netlink v1.3.1 // indirect
 	github.com/vishvananda/netns v0.0.5 // indirect
-	golang.org/x/crypto v0.48.0 // indirect
+	golang.org/x/crypto v0.49.0 // indirect
 	golang.org/x/exp v0.0.0-20251113190631-e25ba8c21ef6 // indirect
-	golang.org/x/mod v0.32.0 // indirect
-	golang.org/x/net v0.51.0 // indirect
-	golang.org/x/sync v0.19.0 // indirect
+	golang.org/x/mod v0.33.0 // indirect
+	golang.org/x/net v0.52.0 // indirect
+	golang.org/x/sync v0.20.0 // indirect
 	golang.org/x/time v0.12.0 // indirect
-	golang.org/x/tools v0.41.0 // indirect
+	golang.org/x/tools v0.42.0 // indirect
 	golang.zx2c4.com/wintun v0.0.0-20230126152724-0fa3db229ce2 // indirect
 	golang.zx2c4.com/wireguard/windows v0.5.3 // indirect
 )

go.sum

@@ -1,7 +1,7 @@
 github.com/Microsoft/go-winio v0.6.2 h1:F2VQgta7ecxGYO8k3ZZz3RS8fVIXVxONVUPlNERoyfY=
 github.com/Microsoft/go-winio v0.6.2/go.mod h1:yd8OoFMLzJbo9gZq8j5qaps8bJ9aShtEA8Ipt1oGCvU=
-github.com/fosrl/newt v1.10.3 h1:JO9gFK9LP/w2EeDIn4wU+jKggAFPo06hX5hxFSETqcw=
-github.com/fosrl/newt v1.10.3/go.mod h1:iYuuCAG7iabheiogMOX87r61uQN31S39nKxMKRuLS+s=
+github.com/fosrl/newt v1.12.0 h1:IodzVlsprOYkHvKrXwDfDTh2ZMtXV6IG1rhUj6Jhd44=
+github.com/fosrl/newt v1.12.0/go.mod h1:IJW2sZ4WKKLRuxMz6oBm8PMyAEVkOxZk6d1OUV5/LPM=
 github.com/godbus/dbus/v5 v5.2.2 h1:TUR3TgtSVDmjiXOgAAyaZbYmIeP3DPkld3jgKGV8mXQ=
 github.com/godbus/dbus/v5 v5.2.2/go.mod h1:3AAv2+hPq5rdnr5txxxRwiGjPXamgoIHgz9FPBfOp3c=
 github.com/google/btree v1.1.3 h1:CVpQJjYgC4VbzxeGVHfvZrv1ctoYCAI8vbl07Fcxlyg=
@@ -16,24 +16,24 @@ github.com/vishvananda/netlink v1.3.1 h1:3AEMt62VKqz90r0tmNhog0r/PpWKmrEShJU0wJW
 github.com/vishvananda/netlink v1.3.1/go.mod h1:ARtKouGSTGchR8aMwmkzC0qiNPrrWO5JS/XMVl45+b4=
 github.com/vishvananda/netns v0.0.5 h1:DfiHV+j8bA32MFM7bfEunvT8IAqQ/NzSJHtcmW5zdEY=
 github.com/vishvananda/netns v0.0.5/go.mod h1:SpkAiCQRtJ6TvvxPnOSyH3BMl6unz3xZlaprSwhNNJM=
-golang.org/x/crypto v0.48.0 h1:/VRzVqiRSggnhY7gNRxPauEQ5Drw9haKdM0jqfcCFts=
-golang.org/x/crypto v0.48.0/go.mod h1:r0kV5h3qnFPlQnBSrULhlsRfryS2pmewsg+XfMgkVos=
+golang.org/x/crypto v0.49.0 h1:+Ng2ULVvLHnJ/ZFEq4KdcDd/cfjrrjjNSXNzxg0Y4U4=
+golang.org/x/crypto v0.49.0/go.mod h1:ErX4dUh2UM+CFYiXZRTcMpEcN8b/1gxEuv3nODoYtCA=
 golang.org/x/exp v0.0.0-20251113190631-e25ba8c21ef6 h1:zfMcR1Cs4KNuomFFgGefv5N0czO2XZpUbxGUy8i8ug0=
 golang.org/x/exp v0.0.0-20251113190631-e25ba8c21ef6/go.mod h1:46edojNIoXTNOhySWIWdix628clX9ODXwPsQuG6hsK0=
-golang.org/x/mod v0.32.0 h1:9F4d3PHLljb6x//jOyokMv3eX+YDeepZSEo3mFJy93c=
-golang.org/x/mod v0.32.0/go.mod h1:SgipZ/3h2Ci89DlEtEXWUk/HteuRin+HHhN+WbNhguU=
-golang.org/x/net v0.51.0 h1:94R/GTO7mt3/4wIKpcR5gkGmRLOuE/2hNGeWq/GBIFo=
-golang.org/x/net v0.51.0/go.mod h1:aamm+2QF5ogm02fjy5Bb7CQ0WMt1/WVM7FtyaTLlA9Y=
-golang.org/x/sync v0.19.0 h1:vV+1eWNmZ5geRlYjzm2adRgW2/mcpevXNg50YZtPCE4=
-golang.org/x/sync v0.19.0/go.mod h1:9KTHXmSnoGruLpwFjVSX0lNNA75CykiMECbovNTZqGI=
+golang.org/x/mod v0.33.0 h1:tHFzIWbBifEmbwtGz65eaWyGiGZatSrT9prnU8DbVL8=
+golang.org/x/mod v0.33.0/go.mod h1:swjeQEj+6r7fODbD2cqrnje9PnziFuw4bmLbBZFrQ5w=
+golang.org/x/net v0.52.0 h1:He/TN1l0e4mmR3QqHMT2Xab3Aj3L9qjbhRm78/6jrW0=
+golang.org/x/net v0.52.0/go.mod h1:R1MAz7uMZxVMualyPXb+VaqGSa3LIaUqk0eEt3w36Sw=
+golang.org/x/sync v0.20.0 h1:e0PTpb7pjO8GAtTs2dQ6jYa5BWYlMuX047Dco/pItO4=
+golang.org/x/sync v0.20.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
 golang.org/x/sys v0.2.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.10.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.41.0 h1:Ivj+2Cp/ylzLiEU89QhWblYnOE9zerudt9Ftecq2C6k=
-golang.org/x/sys v0.41.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
+golang.org/x/sys v0.42.0 h1:omrd2nAlyT5ESRdCLYdm3+fMfNFE/+Rf4bDIQImRJeo=
+golang.org/x/sys v0.42.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
 golang.org/x/time v0.12.0 h1:ScB/8o8olJvc+CQPWrK3fPZNfh7qgwCrY0zJmoEQLSE=
 golang.org/x/time v0.12.0/go.mod h1:CDIdPxbZBQxdj6cxyCIdrNogrJKMJ7pr37NYpMcMDSg=
-golang.org/x/tools v0.41.0 h1:a9b8iMweWG+S0OBnlU36rzLp20z1Rp10w+IY2czHTQc=
-golang.org/x/tools v0.41.0/go.mod h1:XSY6eDqxVNiYgezAVqqCeihT4j1U2CCsqvH3WhQpnlg=
+golang.org/x/tools v0.42.0 h1:uNgphsn75Tdz5Ji2q36v/nsFSfR/9BRFvqhGBaJGd5k=
+golang.org/x/tools v0.42.0/go.mod h1:Ma6lCIwGZvHK6XtgbswSoWroEkhugApmsXyrUmBhfr0=
 golang.zx2c4.com/wintun v0.0.0-20230126152724-0fa3db229ce2 h1:B82qJJgjvYKsXS9jeunTOisW56dUokqW/FOteYJJ/yg=
 golang.zx2c4.com/wintun v0.0.0-20230126152724-0fa3db229ce2/go.mod h1:deeaetjYA+DHMHg+sMSMI58GrEteJUUzzw7en6TJQcI=
 golang.zx2c4.com/wireguard v0.0.0-20250521234502-f333402bd9cb h1:whnFRlWMcXI9d+ZbWg+4sHnLp52d5yiIPUxMBSt4X9A=

olm/connect.go

@@ -205,12 +205,13 @@ func (o *Olm) handleConnect(msg websocket.WSMessage) {
 	// Register JIT handler: when the DNS proxy resolves a local record, check whether
 	// the owning site is already connected and, if not, initiate a JIT connection.
 	o.dnsProxy.SetJITHandler(func(siteId int) {
-		if o.peerManager == nil || o.websocket == nil {
+		pm := o.getPeerManager()
+		if pm == nil || o.websocket == nil {
 			return
 		}
 
 		// Site already has an active peer connection - nothing to do.
-		if _, exists := o.peerManager.GetPeer(siteId); exists {
+		if _, exists := pm.GetPeer(siteId); exists {
 			return
 		}
 

olm/data.go

@@ -32,21 +32,27 @@ func (o *Olm) handleWgPeerAddData(msg websocket.WSMessage) {
 		return
 	}
 
-	if _, exists := o.peerManager.GetPeer(addSubnetsData.SiteId); !exists {
+	pm := o.getPeerManager()
+	if pm == nil {
+		logger.Debug("Ignoring add-remote-subnets-aliases message: peerManager is nil (shutdown in progress)")
+		return
+	}
+
+	if _, exists := pm.GetPeer(addSubnetsData.SiteId); !exists {
 		logger.Debug("Peer %d not found for removing remote subnets and aliases", addSubnetsData.SiteId)
 		return
 	}
 
 	// Add new subnets
 	for _, subnet := range addSubnetsData.RemoteSubnets {
-		if err := o.peerManager.AddRemoteSubnet(addSubnetsData.SiteId, subnet); err != nil {
+		if err := pm.AddRemoteSubnet(addSubnetsData.SiteId, subnet); err != nil {
 			logger.Error("Failed to add allowed IP %s: %v", subnet, err)
 		}
 	}
 
 	// Add new aliases
 	for _, alias := range addSubnetsData.Aliases {
-		if err := o.peerManager.AddAlias(addSubnetsData.SiteId, alias); err != nil {
+		if err := pm.AddAlias(addSubnetsData.SiteId, alias); err != nil {
 			logger.Error("Failed to add alias %s: %v", alias.Alias, err)
 		}
 	}
@@ -73,21 +79,27 @@ func (o *Olm) handleWgPeerRemoveData(msg websocket.WSMessage) {
 		return
 	}
 
-	if _, exists := o.peerManager.GetPeer(removeSubnetsData.SiteId); !exists {
+	pm := o.getPeerManager()
+	if pm == nil {
+		logger.Debug("Ignoring remove-remote-subnets-aliases message: peerManager is nil (shutdown in progress)")
+		return
+	}
+
+	if _, exists := pm.GetPeer(removeSubnetsData.SiteId); !exists {
 		logger.Debug("Peer %d not found for removing remote subnets and aliases", removeSubnetsData.SiteId)
 		return
 	}
 
 	// Remove subnets
 	for _, subnet := range removeSubnetsData.RemoteSubnets {
-		if err := o.peerManager.RemoveRemoteSubnet(removeSubnetsData.SiteId, subnet); err != nil {
+		if err := pm.RemoveRemoteSubnet(removeSubnetsData.SiteId, subnet); err != nil {
 			logger.Error("Failed to remove allowed IP %s: %v", subnet, err)
 		}
 	}
 
 	// Remove aliases
 	for _, alias := range removeSubnetsData.Aliases {
-		if err := o.peerManager.RemoveAlias(removeSubnetsData.SiteId, alias.Alias); err != nil {
+		if err := pm.RemoveAlias(removeSubnetsData.SiteId, alias.Alias); err != nil {
 			logger.Error("Failed to remove alias %s: %v", alias.Alias, err)
 		}
 	}
@@ -114,7 +126,13 @@ func (o *Olm) handleWgPeerUpdateData(msg websocket.WSMessage) {
 		return
 	}
 
-	if _, exists := o.peerManager.GetPeer(updateSubnetsData.SiteId); !exists {
+	pm := o.getPeerManager()
+	if pm == nil {
+		logger.Debug("Ignoring update-remote-subnets-aliases message: peerManager is nil (shutdown in progress)")
+		return
+	}
+
+	if _, exists := pm.GetPeer(updateSubnetsData.SiteId); !exists {
 		logger.Debug("Peer %d not found for updating remote subnets and aliases", updateSubnetsData.SiteId)
 		return
 	}
@@ -123,14 +141,14 @@ func (o *Olm) handleWgPeerUpdateData(msg websocket.WSMessage) {
 	// This ensures that if an old and new subnet are the same on different peers,
 	// the route won't be temporarily removed
 	for _, subnet := range updateSubnetsData.NewRemoteSubnets {
-		if err := o.peerManager.AddRemoteSubnet(updateSubnetsData.SiteId, subnet); err != nil {
+		if err := pm.AddRemoteSubnet(updateSubnetsData.SiteId, subnet); err != nil {
 			logger.Error("Failed to add allowed IP %s: %v", subnet, err)
 		}
 	}
 
 	// Remove old subnets after new ones are added
 	for _, subnet := range updateSubnetsData.OldRemoteSubnets {
-		if err := o.peerManager.RemoveRemoteSubnet(updateSubnetsData.SiteId, subnet); err != nil {
+		if err := pm.RemoveRemoteSubnet(updateSubnetsData.SiteId, subnet); err != nil {
 			logger.Error("Failed to remove allowed IP %s: %v", subnet, err)
 		}
 	}
@@ -139,14 +157,14 @@ func (o *Olm) handleWgPeerUpdateData(msg websocket.WSMessage) {
 	// This ensures that if an old and new alias share the same IP, the IP won't be
 	// temporarily removed from the allowed IPs list
 	for _, alias := range updateSubnetsData.NewAliases {
-		if err := o.peerManager.AddAlias(updateSubnetsData.SiteId, alias); err != nil {
+		if err := pm.AddAlias(updateSubnetsData.SiteId, alias); err != nil {
 			logger.Error("Failed to add alias %s: %v", alias.Alias, err)
 		}
 	}
 
 	// Remove old aliases after new ones are added
 	for _, alias := range updateSubnetsData.OldAliases {
-		if err := o.peerManager.RemoveAlias(updateSubnetsData.SiteId, alias.Alias); err != nil {
+		if err := pm.RemoveAlias(updateSubnetsData.SiteId, alias.Alias); err != nil {
 			logger.Error("Failed to remove alias %s: %v", alias.Alias, err)
 		}
 	}
@@ -163,7 +181,8 @@ func (o *Olm) handleSync(msg websocket.WSMessage) {
 		return
 	}
 
-	if o.peerManager == nil {
+	pm := o.getPeerManager()
+	if pm == nil {
 		logger.Warn("Peer manager not initialized, ignoring sync request")
 		return
 	}
@@ -190,7 +209,7 @@ func (o *Olm) handleSync(msg websocket.WSMessage) {
 	}
 
 	// Get all current peers
-	currentPeers := o.peerManager.GetAllPeers()
+	currentPeers := pm.GetAllPeers()
 	currentPeerMap := make(map[int]peers.SiteConfig)
 	for _, peer := range currentPeers {
 		currentPeerMap[peer.SiteId] = peer
@@ -200,7 +219,7 @@ func (o *Olm) handleSync(msg websocket.WSMessage) {
 	for siteId := range currentPeerMap {
 		if _, exists := expectedPeers[siteId]; !exists {
 			logger.Info("Sync: Removing peer for site %d (no longer in expected config)", siteId)
-			if err := o.peerManager.RemovePeer(siteId); err != nil {
+			if err := pm.RemovePeer(siteId); err != nil {
 				logger.Error("Sync: Failed to remove peer %d: %v", siteId, err)
 			} else {
 				// Remove any exit nodes associated with this peer from hole punching
@@ -301,7 +320,7 @@ func (o *Olm) handleSync(msg websocket.WSMessage) {
 					siteConfig.Aliases = expectedSite.Aliases
 				}
 
-				if err := o.peerManager.UpdatePeer(siteConfig); err != nil {
+				if err := pm.UpdatePeer(siteConfig); err != nil {
 					logger.Error("Sync: Failed to update peer %d: %v", siteId, err)
 				} else {
 					// If the endpoint changed, trigger holepunch to refresh NAT mappings

olm/olm.go

@@ -47,6 +47,7 @@ type Olm struct {
 	websocket        *websocket.Client
 	holePunchManager *holepunch.Manager
 	peerManager      *peers.PeerManager
+	peerManagerMu    sync.RWMutex
 	// Power mode management
 	currentPowerMode string
 	powerModeMu      sync.Mutex
@@ -76,6 +77,15 @@ type Olm struct {
 	tunnelWg sync.WaitGroup
 }
 
+// getPeerManager safely returns the current peerManager under a read-lock.
+// Callers must check the returned value for nil before using it.
+func (o *Olm) getPeerManager() *peers.PeerManager {
+	o.peerManagerMu.RLock()
+	pm := o.peerManager
+	o.peerManagerMu.RUnlock()
+	return pm
+}
+
 // initTunnelInfo creates the shared UDP socket and holepunch manager.
 // This is used during initial tunnel setup and when switching organizations.
 func (o *Olm) initTunnelInfo(clientID string) error {
@@ -457,7 +467,7 @@ func (o *Olm) StartTunnel(config TunnelConfig) {
 				"userToken":   userToken,
 				"fingerprint": o.fingerprint,
 				"postures":    o.postures,
-			}, 2*time.Second, 10)
+			}, 2*time.Second, 20)
 
 			// Invoke onRegistered callback if configured
 			if o.olmConfig.OnRegistered != nil {
@@ -591,10 +601,12 @@ func (o *Olm) Close() {
 	}
 
 	// Close() also calls Stop() internally
+	o.peerManagerMu.Lock()
 	if o.peerManager != nil {
 		o.peerManager.Close()
 		o.peerManager = nil
 	}
+	o.peerManagerMu.Unlock()
 
 	if o.uapiListener != nil {
 		_ = o.uapiListener.Close()
@@ -806,14 +818,14 @@ func (o *Olm) SetPowerMode(mode string) error {
 
 		lowPowerInterval := 10 * time.Minute
 
-		if o.peerManager != nil {
-			peerMonitor := o.peerManager.GetPeerMonitor()
+		if pm := o.getPeerManager(); pm != nil {
+			peerMonitor := pm.GetPeerMonitor()
 			if peerMonitor != nil {
 				peerMonitor.SetPeerInterval(lowPowerInterval, lowPowerInterval)
 				peerMonitor.SetPeerHolepunchInterval(lowPowerInterval, lowPowerInterval)
 				logger.Info("Set monitoring intervals to 10 minutes for low power mode")
 			}
-			o.peerManager.UpdateAllPeersPersistentKeepalive(0) // disable
+			pm.UpdateAllPeersPersistentKeepalive(0) // disable
 		}
 
 		if o.holePunchManager != nil {
@@ -858,14 +870,14 @@ func (o *Olm) SetPowerMode(mode string) error {
 			}
 
 			// Restore intervals and reconnect websocket
-			if o.peerManager != nil {
-				peerMonitor := o.peerManager.GetPeerMonitor()
+			if pm := o.getPeerManager(); pm != nil {
+				peerMonitor := pm.GetPeerMonitor()
 				if peerMonitor != nil {
 					peerMonitor.ResetPeerHolepunchInterval()
 					peerMonitor.ResetPeerInterval()
 				}
 
-				o.peerManager.UpdateAllPeersPersistentKeepalive(5)
+				pm.UpdateAllPeersPersistentKeepalive(5)
 			}
 
 			if o.holePunchManager != nil {

olm/peer.go

@@ -20,7 +20,8 @@ func (o *Olm) handleWgPeerAdd(msg websocket.WSMessage) {
 		return
 	}
 
-	if o.peerManager == nil {
+	pm := o.getPeerManager()
+	if pm == nil {
 		logger.Debug("Ignoring add-peer message: peerManager is nil (shutdown in progress)")
 		return
 	}
@@ -64,7 +65,7 @@ func (o *Olm) handleWgPeerAdd(msg websocket.WSMessage) {
 
 	_ = o.holePunchManager.TriggerHolePunch() // Trigger immediate hole punch attempt so that if the peer decides to relay we have already punched close to when we need it
 
-	if err := o.peerManager.AddPeer(siteConfigMsg.SiteConfig); err != nil {
+	if err := pm.AddPeer(siteConfigMsg.SiteConfig); err != nil {
 		logger.Error("Failed to add peer: %v", err)
 		return
 	}
@@ -81,7 +82,8 @@ func (o *Olm) handleWgPeerRemove(msg websocket.WSMessage) {
 		return
 	}
 
-	if o.peerManager == nil {
+	pm := o.getPeerManager()
+	if pm == nil {
 		logger.Debug("Ignoring remove-peer message: peerManager is nil (shutdown in progress)")
 		return
 	}
@@ -98,7 +100,7 @@ func (o *Olm) handleWgPeerRemove(msg websocket.WSMessage) {
 		return
 	}
 
-	if err := o.peerManager.RemovePeer(removeData.SiteId); err != nil {
+	if err := pm.RemovePeer(removeData.SiteId); err != nil {
 		logger.Error("Failed to remove peer: %v", err)
 		return
 	}
@@ -123,7 +125,8 @@ func (o *Olm) handleWgPeerUpdate(msg websocket.WSMessage) {
 		return
 	}
 
-	if o.peerManager == nil {
+	pm := o.getPeerManager()
+	if pm == nil {
 		logger.Debug("Ignoring update-peer message: peerManager is nil (shutdown in progress)")
 		return
 	}
@@ -141,7 +144,7 @@ func (o *Olm) handleWgPeerUpdate(msg websocket.WSMessage) {
 	}
 
 	// Get existing peer from PeerManager
-	existingPeer, exists := o.peerManager.GetPeer(updateData.SiteId)
+	existingPeer, exists := pm.GetPeer(updateData.SiteId)
 	if !exists {
 		logger.Warn("Peer with site ID %d not found", updateData.SiteId)
 		return
@@ -169,7 +172,7 @@ func (o *Olm) handleWgPeerUpdate(msg websocket.WSMessage) {
 		siteConfig.RemoteSubnets = updateData.RemoteSubnets
 	}
 
-	if err := o.peerManager.UpdatePeer(siteConfig); err != nil {
+	if err := pm.UpdatePeer(siteConfig); err != nil {
 		logger.Error("Failed to update peer: %v", err)
 		return
 	}
@@ -188,7 +191,8 @@ func (o *Olm) handleWgPeerRelay(msg websocket.WSMessage) {
 	logger.Debug("Received relay-peer message: %v", msg.Data)
 
 	// Check if peerManager is still valid (may be nil during shutdown)
-	if o.peerManager == nil {
+	pm := o.getPeerManager()
+	if pm == nil {
 		logger.Debug("Ignoring relay message: peerManager is nil (shutdown in progress)")
 		return
 	}
@@ -208,7 +212,7 @@ func (o *Olm) handleWgPeerRelay(msg websocket.WSMessage) {
 		return
 	}
 
-	if monitor := o.peerManager.GetPeerMonitor(); monitor != nil {
+	if monitor := pm.GetPeerMonitor(); monitor != nil {
 		monitor.CancelRelaySend(relayData.ChainId)
 	}
 
@@ -222,14 +226,15 @@ func (o *Olm) handleWgPeerRelay(msg websocket.WSMessage) {
 	// Update HTTP server to mark this peer as using relay
 	o.apiServer.UpdatePeerRelayStatus(relayData.SiteId, relayData.RelayEndpoint, true)
 
-	o.peerManager.RelayPeer(relayData.SiteId, primaryRelay, relayData.RelayPort)
+	pm.RelayPeer(relayData.SiteId, primaryRelay, relayData.RelayPort)
 }
 
 func (o *Olm) handleWgPeerUnrelay(msg websocket.WSMessage) {
 	logger.Debug("Received unrelay-peer message: %v", msg.Data)
 
 	// Check if peerManager is still valid (may be nil during shutdown)
-	if o.peerManager == nil {
+	pm := o.getPeerManager()
+	if pm == nil {
 		logger.Debug("Ignoring unrelay message: peerManager is nil (shutdown in progress)")
 		return
 	}
@@ -249,7 +254,7 @@ func (o *Olm) handleWgPeerUnrelay(msg websocket.WSMessage) {
 		return
 	}
 
-	if monitor := o.peerManager.GetPeerMonitor(); monitor != nil {
+	if monitor := pm.GetPeerMonitor(); monitor != nil {
 		monitor.CancelRelaySend(relayData.ChainId)
 	}
 
@@ -262,7 +267,7 @@ func (o *Olm) handleWgPeerUnrelay(msg websocket.WSMessage) {
 	// Update HTTP server to mark this peer as using relay
 	o.apiServer.UpdatePeerRelayStatus(relayData.SiteId, relayData.Endpoint, false)
 
-	o.peerManager.UnRelayPeer(relayData.SiteId, primaryRelay)
+	pm.UnRelayPeer(relayData.SiteId, primaryRelay)
 }
 
 func (o *Olm) handleWgPeerHolepunchAddSite(msg websocket.WSMessage) {
@@ -317,7 +322,12 @@ func (o *Olm) handleWgPeerHolepunchAddSite(msg websocket.WSMessage) {
 	}
 
 	// Get existing peer from PeerManager
-	_, exists := o.peerManager.GetPeer(handshakeData.SiteId)
+	pm := o.getPeerManager()
+	if pm == nil {
+		logger.Debug("Ignoring peer-handshake message: peerManager is nil (shutdown in progress)")
+		return
+	}
+	_, exists := pm.GetPeer(handshakeData.SiteId)
 	if exists {
 		logger.Warn("Peer with site ID %d already added", handshakeData.SiteId)
 		return

peers/manager.go

@@ -6,6 +6,7 @@ import (
 	"strconv"
 	"strings"
 	"sync"
+	"time"
 
 	"github.com/fosrl/newt/bind"
 	"github.com/fosrl/newt/logger"
@@ -54,6 +55,9 @@ type PeerManager struct {
 	publicDNS     []string
 
 	PersistentKeepalive int
+
+	routeOptimizerStop chan struct{}
+	optimizerTrigger   chan struct{}
 }
 
 // NewPeerManager creates a new PeerManager with an internal PeerMonitor
@@ -80,6 +84,8 @@ func NewPeerManager(config PeerManagerConfig) *PeerManager {
 		config.PublicDNS,
 	)
 
+	pm.optimizerTrigger = make(chan struct{}, 1)
+
 	return pm
 }
 
@@ -856,10 +862,12 @@ func (pm *PeerManager) Start() {
 	if pm.peerMonitor != nil {
 		pm.peerMonitor.Start()
 	}
+	pm.startRouteOptimizer()
 }
 
 // Stop stops the peer monitor
 func (pm *PeerManager) Stop() {
+	pm.stopRouteOptimizer()
 	if pm.peerMonitor != nil {
 		pm.peerMonitor.Stop()
 	}
@@ -867,6 +875,7 @@ func (pm *PeerManager) Stop() {
 
 // Close stops the peer monitor and cleans up resources
 func (pm *PeerManager) Close() {
+	pm.stopRouteOptimizer()
 	if pm.peerMonitor != nil {
 		pm.peerMonitor.Close()
 		pm.peerMonitor = nil
@@ -928,3 +937,166 @@ endpoint=%s`, util.FixKey(peer.PublicKey), endpoint)
 	logger.Info("Switched peer %d back to direct connection at %s", siteId, endpoint)
 	return nil
 }
+
+// isBetterConnection returns true if connection quality (a) is better than (b).
+// Priority: connected > disconnected, then direct > relayed, then lower RTT.
+func isBetterConnection(aConn bool, aRelay bool, aRTT time.Duration,
+	bConn bool, bRelay bool, bRTT time.Duration) bool {
+	if aConn != bConn {
+		return aConn // connected beats disconnected
+	}
+	if !aConn {
+		return false // both offline, no preference
+	}
+	if aRelay != bRelay {
+		return !aRelay // direct beats relayed
+	}
+	// Same connectivity class: prefer lower RTT
+	if aRTT == 0 {
+		return false // unknown RTT, don't displace
+	}
+	if bRTT == 0 {
+		return true // current has no RTT data, prefer known
+	}
+	return aRTT < bRTT
+}
+
+// selectBestOwner returns the siteId of the best site to own the given IP,
+// based on connection quality. Must be called with pm.mu held.
+func (pm *PeerManager) selectBestOwner(claims map[int]bool) int {
+	bestSiteId := -1
+	var bestConn, bestRelay bool
+	var bestRTT time.Duration
+
+	for siteId := range claims {
+		conn, relay, rtt := pm.peerMonitor.GetConnectionQuality(siteId)
+		if bestSiteId < 0 || isBetterConnection(conn, relay, rtt, bestConn, bestRelay, bestRTT) {
+			bestSiteId = siteId
+			bestConn = conn
+			bestRelay = relay
+			bestRTT = rtt
+		}
+	}
+	return bestSiteId
+}
+
+// getWireGuardAllowedIPs returns the full set of IPs that should be in WireGuard
+// for a peer: server IP /32 plus all shared IPs it currently owns.
+// Must be called with pm.mu held.
+func (pm *PeerManager) getWireGuardAllowedIPs(siteId int) []string {
+	peer, exists := pm.peers[siteId]
+	if !exists {
+		return nil
+	}
+	serverIP := strings.Split(peer.ServerIP, "/")[0] + "/32"
+	ips := []string{serverIP}
+	for cidr, owner := range pm.allowedIPOwners {
+		if owner == siteId {
+			ips = append(ips, cidr)
+		}
+	}
+	return ips
+}
+
+// transferOwnership moves WireGuard ownership of cidr from fromSiteId to toSiteId.
+// Must be called with pm.mu held.
+func (pm *PeerManager) transferOwnership(cidr string, fromSiteId int, toSiteId int) error {
+	// Update owner map first
+	pm.allowedIPOwners[cidr] = toSiteId
+
+	// Remove cidr from old owner's WireGuard allowed IPs
+	if fromPeer, exists := pm.peers[fromSiteId]; exists {
+		remaining := pm.getWireGuardAllowedIPs(fromSiteId) // cidr is no longer in owners, so it won't appear here
+		if err := RemoveAllowedIP(pm.device, fromPeer.PublicKey, remaining); err != nil {
+			// Revert
+			pm.allowedIPOwners[cidr] = fromSiteId
+			return fmt.Errorf("remove IP %s from site %d: %v", cidr, fromSiteId, err)
+		}
+	}
+
+	// Add cidr to new owner's WireGuard allowed IPs
+	if toPeer, exists := pm.peers[toSiteId]; exists {
+		if err := AddAllowedIP(pm.device, toPeer.PublicKey, cidr); err != nil {
+			return fmt.Errorf("add IP %s to site %d: %v", cidr, toSiteId, err)
+		}
+	}
+
+	return nil
+}
+
+// optimizeRoutes evaluates all shared IPs and reassigns ownership to the best site.
+func (pm *PeerManager) optimizeRoutes() {
+	pm.mu.Lock()
+	defer pm.mu.Unlock()
+
+	for cidr, claims := range pm.allowedIPClaims {
+		if len(claims) <= 1 {
+			continue // No competition, nothing to optimize
+		}
+
+		currentOwner, hasOwner := pm.allowedIPOwners[cidr]
+		bestOwner := pm.selectBestOwner(claims)
+
+		if bestOwner < 0 {
+			continue
+		}
+		if hasOwner && currentOwner == bestOwner {
+			continue // Already on the best site
+		}
+
+		if !hasOwner {
+			// No current owner, just assign
+			pm.allowedIPOwners[cidr] = bestOwner
+			if toPeer, exists := pm.peers[bestOwner]; exists {
+				if err := AddAllowedIP(pm.device, toPeer.PublicKey, cidr); err != nil {
+					logger.Error("Failed to assign IP %s to site %d: %v", cidr, bestOwner, err)
+				}
+			}
+			continue
+		}
+
+		logger.Info("Route optimizer: moving %s from site %d to site %d", cidr, currentOwner, bestOwner)
+		if err := pm.transferOwnership(cidr, currentOwner, bestOwner); err != nil {
+			logger.Error("Failed to transfer ownership of %s from site %d to site %d: %v",
+				cidr, currentOwner, bestOwner, err)
+		}
+	}
+}
+
+// startRouteOptimizer registers the status-change callback and launches the optimizer goroutine.
+func (pm *PeerManager) startRouteOptimizer() {
+	pm.routeOptimizerStop = make(chan struct{})
+
+	// Trigger optimization whenever any peer's connection status changes
+	if pm.peerMonitor != nil {
+		pm.peerMonitor.SetStatusChangeCallback(func(_ int) {
+			select {
+			case pm.optimizerTrigger <- struct{}{}:
+			default:
+			}
+		})
+	}
+
+	go func() {
+		ticker := time.NewTicker(5 * time.Second)
+		defer ticker.Stop()
+		for {
+			select {
+			case <-pm.routeOptimizerStop:
+				return
+			case <-pm.optimizerTrigger:
+				pm.optimizeRoutes()
+			case <-ticker.C:
+				pm.optimizeRoutes()
+			}
+		}
+	}()
+}
+
+// stopRouteOptimizer stops the route optimizer goroutine if it is running.
+func (pm *PeerManager) stopRouteOptimizer() {
+	if pm.routeOptimizerStop != nil {
+		close(pm.routeOptimizerStop)
+		pm.routeOptimizerStop = nil
+	}
+}

peers/monitor/monitor.go

@@ -86,6 +86,8 @@ type PeerMonitor struct {
 
 	// WG connection status tracking
 	wgConnectionStatus  map[int]bool          // siteID -> WG connected status
+	wgConnectionRTT     map[int]time.Duration // siteID -> last known RTT
+	statusChangeCallback func(siteId int)      // called when any peer's connection status changes
 }
 
 // NewPeerMonitor creates a new peer monitor with the given callback
@@ -122,6 +124,7 @@ func NewPeerMonitor(wsClient *websocket.Client, middleDev *middleDevice.MiddleDe
 		rapidTestMaxAttempts: 5,                      // 5 attempts = ~1-1.5 seconds total
 		apiServer:            apiServer,
 		wgConnectionStatus:   make(map[int]bool),
+		wgConnectionRTT:      make(map[int]time.Duration),
 		// Exponential backoff settings for holepunch monitor
 		defaultHolepunchMinInterval: 2 * time.Second,
 		defaultHolepunchMaxInterval: 30 * time.Second,
@@ -392,6 +395,9 @@ func (pm *PeerMonitor) handleConnectionStatusChange(siteID int, status Connectio
 	pm.mutex.Lock()
 	previousStatus, exists := pm.wgConnectionStatus[siteID]
 	pm.wgConnectionStatus[siteID] = status.Connected
+	if status.Connected && status.RTT > 0 {
+		pm.wgConnectionRTT[siteID] = status.RTT
+	}
 	isRelayed := pm.relayedPeers[siteID]
 	endpoint := pm.holepunchEndpoints[siteID]
 	pm.mutex.Unlock()
@@ -409,6 +415,11 @@ func (pm *PeerMonitor) handleConnectionStatusChange(siteID int, status Connectio
 	if pm.apiServer != nil {
 		pm.apiServer.UpdatePeerStatus(siteID, status.Connected, status.RTT, endpoint, isRelayed)
 	}
+
+	// Notify route optimizer of status change
+	if pm.statusChangeCallback != nil {
+		pm.statusChangeCallback(siteID)
+	}
 }
 
 // sendRelay sends a relay message to the server with retry, keyed by chainId
@@ -521,6 +532,25 @@ func (pm *PeerMonitor) IsPeerRelayed(siteID int) bool {
 	return pm.relayedPeers[siteID]
 }
 
+// SetStatusChangeCallback registers a callback that is invoked whenever a peer's
+// WireGuard connection status changes (connected/disconnected). The callback must
+// be non-blocking (e.g., send to a buffered channel).
+func (pm *PeerMonitor) SetStatusChangeCallback(cb func(siteId int)) {
+	pm.mutex.Lock()
+	defer pm.mutex.Unlock()
+	pm.statusChangeCallback = cb
+}
+
+// GetConnectionQuality returns the current connection quality metrics for a peer.
+func (pm *PeerMonitor) GetConnectionQuality(siteId int) (connected bool, relayed bool, rtt time.Duration) {
+	pm.mutex.Lock()
+	defer pm.mutex.Unlock()
+	connected = pm.wgConnectionStatus[siteId]
+	relayed = pm.relayedPeers[siteId]
+	rtt = pm.wgConnectionRTT[siteId]
+	return
+}
+
 // startHolepunchMonitor starts the holepunch connection monitoring
 // Note: This function assumes the mutex is already held by the caller (called from Start())
 func (pm *PeerMonitor) startHolepunchMonitor() error {