[client] WGwatcher error handling

client/internal/peer/conn.go

@@ -135,21 +135,11 @@ func NewConn(engineCtx context.Context, config ConnConfig, statusRecorder *Statu
 		semaphore:      semaphore,
 	}
 
-	rFns := WorkerRelayCallbacks{
-		OnConnReady:    conn.relayConnectionIsReady,
-		OnDisconnected: conn.onWorkerRelayStateDisconnected,
-	}
-
-	wFns := WorkerICECallbacks{
-		OnConnReady:     conn.iCEConnectionIsReady,
-		OnStatusChanged: conn.onWorkerICEStateDisconnected,
-	}
-
 	ctrl := isController(config)
-	conn.workerRelay = NewWorkerRelay(connLog, ctrl, config, relayManager, rFns)
+	conn.workerRelay = NewWorkerRelay(connLog, ctrl, config, conn, relayManager)
 
 	relayIsSupportedLocally := conn.workerRelay.RelayIsSupportedLocally()
-	conn.workerICE, err = NewWorkerICE(ctx, connLog, config, signaler, iFaceDiscover, statusRecorder, relayIsSupportedLocally, wFns)
+	conn.workerICE, err = NewWorkerICE(ctx, connLog, config, conn, signaler, iFaceDiscover, statusRecorder, relayIsSupportedLocally)
 	if err != nil {
 		return nil, err
 	}
@@ -304,7 +294,7 @@ func (conn *Conn) GetKey() string {
 }
 
 // configureConnection starts proxying traffic from/to local Wireguard and sets connection status to StatusConnected
-func (conn *Conn) iCEConnectionIsReady(priority ConnPriority, iceConnInfo ICEConnInfo) {
+func (conn *Conn) onICEConnectionIsReady(priority ConnPriority, iceConnInfo ICEConnInfo) {
 	conn.mu.Lock()
 	defer conn.mu.Unlock()
 
@@ -376,15 +366,15 @@ func (conn *Conn) iCEConnectionIsReady(priority ConnPriority, iceConnInfo ICECon
 }
 
 // todo review to make sense to handle connecting and disconnected status also?
-func (conn *Conn) onWorkerICEStateDisconnected(newState ConnStatus) {
+func (conn *Conn) onICEStateDisconnected() {
 	conn.mu.Lock()
 	defer conn.mu.Unlock()
 
 	if conn.ctx.Err() != nil {
 		return
 	}
 
-	conn.log.Tracef("ICE connection state changed to %s", newState)
+	conn.log.Tracef("ICE connection state changed to disconnected")
 
 	if conn.wgProxyICE != nil {
 		if err := conn.wgProxyICE.CloseConn(); err != nil {
@@ -404,10 +394,11 @@ func (conn *Conn) onWorkerICEStateDisconnected(newState ConnStatus) {
 		conn.currentConnPriority = connPriorityRelay
 	}
 
-	changed := conn.statusICE.Get() != newState && newState != StatusConnecting
-	conn.statusICE.Set(newState)
-
-	conn.guard.SetICEConnDisconnected(changed)
+	changed := conn.statusICE.Get() != StatusDisconnected
+	if changed {
+		conn.guard.SetICEConnDisconnected()
+	}
+	conn.statusICE.Set(StatusDisconnected)
 
 	peerState := State{
 		PubKey:           conn.config.Key,
@@ -422,7 +413,7 @@ func (conn *Conn) onWorkerICEStateDisconnected(newState ConnStatus) {
 	}
 }
 
-func (conn *Conn) relayConnectionIsReady(rci RelayConnInfo) {
+func (conn *Conn) onRelayConnectionIsReady(rci RelayConnInfo) {
 	conn.mu.Lock()
 	defer conn.mu.Unlock()
 
@@ -474,7 +465,7 @@ func (conn *Conn) relayConnectionIsReady(rci RelayConnInfo) {
 	conn.doOnConnected(rci.rosenpassPubKey, rci.rosenpassAddr)
 }
 
-func (conn *Conn) onWorkerRelayStateDisconnected() {
+func (conn *Conn) onRelayDisconnected() {
 	conn.mu.Lock()
 	defer conn.mu.Unlock()
 
@@ -497,8 +488,10 @@ func (conn *Conn) onWorkerRelayStateDisconnected() {
 	}
 
 	changed := conn.statusRelay.Get() != StatusDisconnected
+	if changed {
+		conn.guard.SetRelayedConnDisconnected()
+	}
 	conn.statusRelay.Set(StatusDisconnected)
-	conn.guard.SetRelayedConnDisconnected(changed)
 
 	peerState := State{
 		PubKey:           conn.config.Key,

client/internal/peer/guard/guard.go

@@ -29,8 +29,8 @@ type Guard struct {
 	isConnectedOnAllWay     isConnectedFunc
 	timeout                 time.Duration
 	srWatcher               *SRWatcher
-	relayedConnDisconnected chan bool
-	iCEConnDisconnected     chan bool
+	relayedConnDisconnected chan struct{}
+	iCEConnDisconnected     chan struct{}
 }
 
 func NewGuard(log *log.Entry, isController bool, isConnectedFn isConnectedFunc, timeout time.Duration, srWatcher *SRWatcher) *Guard {
@@ -41,8 +41,8 @@ func NewGuard(log *log.Entry, isController bool, isConnectedFn isConnectedFunc,
 		isConnectedOnAllWay:     isConnectedFn,
 		timeout:                 timeout,
 		srWatcher:               srWatcher,
-		relayedConnDisconnected: make(chan bool, 1),
-		iCEConnDisconnected:     make(chan bool, 1),
+		relayedConnDisconnected: make(chan struct{}, 1),
+		iCEConnDisconnected:     make(chan struct{}, 1),
 	}
 }
 
@@ -54,16 +54,16 @@ func (g *Guard) Start(ctx context.Context) {
 	}
 }
 
-func (g *Guard) SetRelayedConnDisconnected(changed bool) {
+func (g *Guard) SetRelayedConnDisconnected() {
 	select {
-	case g.relayedConnDisconnected <- changed:
+	case g.relayedConnDisconnected <- struct{}{}:
 	default:
 	}
 }
 
-func (g *Guard) SetICEConnDisconnected(changed bool) {
+func (g *Guard) SetICEConnDisconnected() {
 	select {
-	case g.iCEConnDisconnected <- changed:
+	case g.iCEConnDisconnected <- struct{}{}:
 	default:
 	}
 }
@@ -96,19 +96,13 @@ func (g *Guard) reconnectLoopWithRetry(ctx context.Context) {
 				g.triggerOfferSending()
 			}
 
-		case changed := <-g.relayedConnDisconnected:
-			if !changed {
-				continue
-			}
+		case <-g.relayedConnDisconnected:
 			g.log.Debugf("Relay connection changed, reset reconnection ticker")
 			ticker.Stop()
 			ticker = g.prepareExponentTicker(ctx)
 			tickerChannel = ticker.C
 
-		case changed := <-g.iCEConnDisconnected:
-			if !changed {
-				continue
-			}
+		case <-g.iCEConnDisconnected:
 			g.log.Debugf("ICE connection changed, reset reconnection ticker")
 			ticker.Stop()
 			ticker = g.prepareExponentTicker(ctx)
@@ -138,16 +132,10 @@ func (g *Guard) listenForDisconnectEvents(ctx context.Context) {
 	g.log.Infof("start listen for reconnect events...")
 	for {
 		select {
-		case changed := <-g.relayedConnDisconnected:
-			if !changed {
-				continue
-			}
+		case <-g.relayedConnDisconnected:
 			g.log.Debugf("Relay connection changed, triggering reconnect")
 			g.triggerOfferSending()
-		case changed := <-g.iCEConnDisconnected:
-			if !changed {
-				continue
-			}
+		case <-g.iCEConnDisconnected:
 			g.log.Debugf("ICE state changed, try to send new offer")
 			g.triggerOfferSending()
 		case <-srReconnectedChan:

client/internal/peer/wg_watcher.go

@@ -0,0 +1,134 @@
+package peer
+
+import (
+	"context"
+	"sync"
+	"time"
+
+	log "github.com/sirupsen/logrus"
+
+	"github.com/netbirdio/netbird/client/iface/configurer"
+)
+
+const (
+	wgHandshakePeriod = 3 * time.Minute
+)
+
+var (
+	wgHandshakeOvertime = 30 * time.Second
+	checkPeriod         = wgHandshakePeriod + wgHandshakeOvertime
+)
+
+type WGInterfaceStater interface {
+	GetStats(key string) (configurer.WGStats, error)
+}
+
+type WGWatcher struct {
+	log           *log.Entry
+	wgIfaceStater WGInterfaceStater
+	peerKey       string
+
+	ctxCancel context.CancelFunc
+	ctxLock   sync.Mutex
+	waitGroup sync.WaitGroup
+}
+
+func NewWGWatcher(log *log.Entry, wgIfaceStater WGInterfaceStater, peerKey string) *WGWatcher {
+	return &WGWatcher{
+		log:           log,
+		wgIfaceStater: wgIfaceStater,
+		peerKey:       peerKey,
+	}
+}
+
+// EnableWgWatcher starts the WireGuard watcher. If it is already enabled, it will return immediately and do nothing.
+func (w *WGWatcher) EnableWgWatcher(parentCtx context.Context, onDisconnectedFn func()) {
+	w.log.Debugf("enable WireGuard watcher")
+	w.ctxLock.Lock()
+	defer w.ctxLock.Unlock()
+
+	if w.ctxCancel != nil {
+		w.log.Errorf("WireGuard watcher already enabled")
+		return
+	}
+
+	ctx, ctxCancel := context.WithCancel(parentCtx)
+	w.ctxCancel = ctxCancel
+
+	initialHandshake, err := w.wgState()
+	if err != nil {
+		w.log.Warnf("failed to read wg stats: %v", err)
+	}
+
+	w.waitGroup.Add(1)
+	go w.periodicHandshakeCheck(ctx, w.ctxCancel, onDisconnectedFn, initialHandshake)
+}
+
+// DisableWgWatcher stops the WireGuard watcher and wait for the watcher to exit
+func (w *WGWatcher) DisableWgWatcher() {
+	w.ctxLock.Lock()
+	defer w.ctxLock.Unlock()
+
+	if w.ctxCancel == nil {
+		return
+	}
+
+	w.log.Debugf("disable WireGuard watcher")
+
+	w.ctxCancel()
+	w.ctxCancel = nil
+	w.waitGroup.Wait()
+}
+
+// wgStateCheck help to check the state of the WireGuard handshake and relay connection
+func (w *WGWatcher) periodicHandshakeCheck(ctx context.Context, ctxCancel context.CancelFunc, onDisconnectedFn func(), initialHandshake time.Time) {
+	w.log.Debugf("WireGuard watcher started")
+	defer w.waitGroup.Done()
+
+	timer := time.NewTimer(wgHandshakeOvertime)
+	defer timer.Stop()
+	defer ctxCancel()
+
+	lastHandshake := initialHandshake
+
+	for {
+		select {
+		case <-timer.C:
+			handshake, ok := w.handshakeCheck(lastHandshake)
+			if !ok {
+				onDisconnectedFn()
+				return
+			}
+			timer.Reset(time.Until(handshake.Add(checkPeriod)))
+			lastHandshake = *handshake
+		case <-ctx.Done():
+			w.log.Debugf("WireGuard watcher stopped")
+			return
+		}
+	}
+}
+
+func (w *WGWatcher) wgState() (time.Time, error) {
+	wgState, err := w.wgIfaceStater.GetStats(w.peerKey)
+	if err != nil {
+		return time.Time{}, err
+	}
+	return wgState.LastHandshake, nil
+}
+
+func (w *WGWatcher) handshakeCheck(lastHandshake time.Time) (*time.Time, bool) {
+	handshake, err := w.wgState()
+	if err != nil {
+		w.log.Errorf("failed to read wg stats: %v", err)
+		return nil, false
+	}
+
+	w.log.Tracef("previous handshake, handshake: %v, %v", lastHandshake, handshake)
+
+	if handshake.Equal(lastHandshake) {
+		w.log.Infof("WireGuard handshake timed out, closing relay connection: %v", handshake)
+		return nil, false
+	}
+
+	return &handshake, true
+}