Routemgr error handling (#1073)

In case the route management feature is not supported 
then do not create unnecessary firewall and manager instances. 
This can happen if the nftables nor iptables is not available on the host OS.

- Move the error handling to upper layer
- Remove fake, useless implementations of interfaces
- Update go-iptables because In Docker the old version can not 
determine well the path of executable file
- update lib to 0.70

client/internal/routemanager/firewall_linux.go

@@ -27,14 +27,19 @@ func genKey(format string, input string) string {
 }
 
 // NewFirewall if supported, returns an iptables manager, otherwise returns a nftables manager
-func NewFirewall(parentCTX context.Context) firewallManager {
+func NewFirewall(parentCTX context.Context) (firewallManager, error) {
 	manager, err := newNFTablesManager(parentCTX)
 	if err == nil {
 		log.Debugf("nftables firewall manager will be used")
-		return manager
+		return manager, nil
 	}
-	log.Debugf("fallback to iptables firewall manager: %s", err)
-	return newIptablesManager(parentCTX)
+	fMgr, err := newIptablesManager(parentCTX)
+	if err != nil {
+		log.Debugf("failed to initialize iptables for root mgr: %s", err)
+		return nil, err
+	}
+	log.Debugf("iptables firewall manager will be used")
+	return fMgr, nil
 }
 
 func getInPair(pair routerPair) routerPair {

client/internal/routemanager/firewall_nonlinux.go

@@ -3,24 +3,12 @@
 
 package routemanager
 
-import "context"
+import (
+	"context"
+	"fmt"
+)
 
-type unimplementedFirewall struct{}
-
-func (unimplementedFirewall) RestoreOrCreateContainers() error {
-	return nil
-}
-func (unimplementedFirewall) InsertRoutingRules(pair routerPair) error {
-	return nil
-}
-func (unimplementedFirewall) RemoveRoutingRules(pair routerPair) error {
-	return nil
-}
-
-func (unimplementedFirewall) CleanRoutingRules() {
-}
-
-// NewFirewall returns an unimplemented Firewall manager
-func NewFirewall(parentCtx context.Context) firewallManager {
-	return unimplementedFirewall{}
+// NewFirewall returns a nil manager
+func NewFirewall(context.Context) (firewallManager, error) {
+	return nil, fmt.Errorf("firewall not supported on this OS")
 }

client/internal/routemanager/iptables_linux.go

@@ -49,14 +49,12 @@ type iptablesManager struct {
 	mux        sync.Mutex
 }
 
-func newIptablesManager(parentCtx context.Context) *iptablesManager {
-	ctx, cancel := context.WithCancel(parentCtx)
+func newIptablesManager(parentCtx context.Context) (*iptablesManager, error) {
 	ipv4Client, err := iptables.NewWithProtocol(iptables.ProtocolIPv4)
 	if err != nil {
-		log.Debugf("failed to initialize iptables for ipv4: %s", err)
+		return nil, err
 	} else if !isIptablesClientAvailable(ipv4Client) {
-		log.Infof("iptables is missing for ipv4")
-		ipv4Client = nil
+		return nil, fmt.Errorf("iptables is missing for ipv4")
 	}
 	ipv6Client, err := iptables.NewWithProtocol(iptables.ProtocolIPv6)
 	if err != nil {
@@ -66,13 +64,14 @@ func newIptablesManager(parentCtx context.Context) *iptablesManager {
 		ipv6Client = nil
 	}
 
+	ctx, cancel := context.WithCancel(parentCtx)
 	return &iptablesManager{
 		ctx:        ctx,
 		stop:       cancel,
 		ipv4Client: ipv4Client,
 		ipv6Client: ipv6Client,
 		rules:      make(map[string]map[string][]string),
-	}
+	}, nil
 }
 
 // CleanRoutingRules cleans existing iptables resources that we created by the agent
@@ -395,6 +394,10 @@ func (i *iptablesManager) insertRoutingRule(keyFormat, table, chain, jump string
 		ipVersion = ipv6
 	}
 
+	if iptablesClient == nil {
+		return fmt.Errorf("unable to insert iptables routing rules. Iptables client is not initialized")
+	}
+
 	ruleKey := genKey(keyFormat, pair.ID)
 	rule := genRuleSpec(jump, ruleKey, pair.source, pair.destination)
 	existingRule, found := i.rules[ipVersion][ruleKey]
@@ -459,6 +462,10 @@ func (i *iptablesManager) removeRoutingRule(keyFormat, table, chain string, pair
 		ipVersion = ipv6
 	}
 
+	if iptablesClient == nil {
+		return fmt.Errorf("unable to remove iptables routing rules. Iptables client is not initialized")
+	}
+
 	ruleKey := genKey(keyFormat, pair.ID)
 	existingRule, found := i.rules[ipVersion][ruleKey]
 	if found {

client/internal/routemanager/iptables_linux_test.go

@@ -16,7 +16,7 @@ func TestIptablesManager_RestoreOrCreateContainers(t *testing.T) {
 		t.SkipNow()
 	}
 
-	manager := newIptablesManager(context.TODO())
+	manager, _ := newIptablesManager(context.TODO())
 
 	defer manager.CleanRoutingRules()
 

client/internal/routemanager/manager.go

@@ -27,7 +27,7 @@ type DefaultManager struct {
 	stop           context.CancelFunc
 	mux            sync.Mutex
 	clientNetworks map[string]*clientNetwork
-	serverRouter   *serverRouter
+	serverRouter   serverRouter
 	statusRecorder *peer.Status
 	wgInterface    *iface.WGIface
 	pubKey         string
@@ -36,13 +36,17 @@ type DefaultManager struct {
 
 // NewManager returns a new route manager
 func NewManager(ctx context.Context, pubKey string, wgInterface *iface.WGIface, statusRecorder *peer.Status, initialRoutes []*route.Route) *DefaultManager {
-	mCTX, cancel := context.WithCancel(ctx)
+	serverRouter, err := newServerRouter(ctx, wgInterface)
+	if err != nil {
+		log.Errorf("server router is not supported: %s", err)
+	}
 
+	mCTX, cancel := context.WithCancel(ctx)
 	dm := &DefaultManager{
 		ctx:            mCTX,
 		stop:           cancel,
 		clientNetworks: make(map[string]*clientNetwork),
-		serverRouter:   newServerRouter(ctx, wgInterface),
+		serverRouter:   serverRouter,
 		statusRecorder: statusRecorder,
 		wgInterface:    wgInterface,
 		pubKey:         pubKey,
@@ -59,7 +63,9 @@ func NewManager(ctx context.Context, pubKey string, wgInterface *iface.WGIface,
 // Stop stops the manager watchers and clean firewall rules
 func (m *DefaultManager) Stop() {
 	m.stop()
-	m.serverRouter.cleanUp()
+	if m.serverRouter != nil {
+		m.serverRouter.cleanUp()
+	}
 	m.ctx = nil
 }
 
@@ -77,9 +83,12 @@ func (m *DefaultManager) UpdateRoutes(updateSerial uint64, newRoutes []*route.Ro
 
 		m.updateClientNetworks(updateSerial, newClientRoutesIDMap)
 		m.notifier.onNewRoutes(newClientRoutesIDMap)
-		err := m.serverRouter.updateRoutes(newServerRoutesMap)
-		if err != nil {
-			return err
+
+		if m.serverRouter != nil {
+			err := m.serverRouter.updateRoutes(newServerRoutesMap)
+			if err != nil {
+				return err
+			}
 		}
 
 		return nil

client/internal/routemanager/manager_test.go

@@ -30,7 +30,6 @@ func TestManagerUpdateRoutes(t *testing.T) {
 		inputInitRoutes               []*route.Route
 		inputRoutes                   []*route.Route
 		inputSerial                   uint64
-		shouldCheckServerRoutes       bool
 		serverRoutesExpected          int
 		clientNetworkWatchersExpected int
 	}{
@@ -87,7 +86,6 @@ func TestManagerUpdateRoutes(t *testing.T) {
 				},
 			},
 			inputSerial:                   1,
-			shouldCheckServerRoutes:       runtime.GOOS == "linux",
 			serverRoutesExpected:          2,
 			clientNetworkWatchersExpected: 0,
 		},
@@ -116,7 +114,6 @@ func TestManagerUpdateRoutes(t *testing.T) {
 				},
 			},
 			inputSerial:                   1,
-			shouldCheckServerRoutes:       runtime.GOOS == "linux",
 			serverRoutesExpected:          1,
 			clientNetworkWatchersExpected: 1,
 		},
@@ -174,25 +171,6 @@ func TestManagerUpdateRoutes(t *testing.T) {
 			inputSerial:                   1,
 			clientNetworkWatchersExpected: 0,
 		},
-		{
-			name: "No Server Routes Should Be Added To Non Linux",
-			inputRoutes: []*route.Route{
-				{
-					ID:          "a",
-					NetID:       "routeA",
-					Peer:        localPeerKey,
-					Network:     netip.MustParsePrefix("1.2.3.4/32"),
-					NetworkType: route.IPv4Network,
-					Metric:      9999,
-					Masquerade:  false,
-					Enabled:     true,
-				},
-			},
-			inputSerial:                   1,
-			shouldCheckServerRoutes:       runtime.GOOS != "linux",
-			serverRoutesExpected:          0,
-			clientNetworkWatchersExpected: 0,
-		},
 		{
 			name: "Remove 1 Client Route",
 			inputInitRoutes: []*route.Route{
@@ -335,7 +313,6 @@ func TestManagerUpdateRoutes(t *testing.T) {
 			},
 			inputRoutes:                   []*route.Route{},
 			inputSerial:                   1,
-			shouldCheckServerRoutes:       true,
 			serverRoutesExpected:          0,
 			clientNetworkWatchersExpected: 0,
 		},
@@ -384,7 +361,6 @@ func TestManagerUpdateRoutes(t *testing.T) {
 				},
 			},
 			inputSerial:                   1,
-			shouldCheckServerRoutes:       runtime.GOOS == "linux",
 			serverRoutesExpected:          2,
 			clientNetworkWatchersExpected: 1,
 		},
@@ -419,8 +395,9 @@ func TestManagerUpdateRoutes(t *testing.T) {
 
 			require.Len(t, routeManager.clientNetworks, testCase.clientNetworkWatchersExpected, "client networks size should match")
 
-			if testCase.shouldCheckServerRoutes {
-				require.Len(t, routeManager.serverRouter.routes, testCase.serverRoutesExpected, "server networks size should match")
+			if runtime.GOOS == "linux" {
+				sr := routeManager.serverRouter.(*defaultServerRouter)
+				require.Len(t, sr.routes, testCase.serverRoutesExpected, "server networks size should match")
 			}
 		})
 	}

client/internal/routemanager/server.go

@@ -0,0 +1,9 @@
+package routemanager
+
+import "github.com/netbirdio/netbird/route"
+
+type serverRouter interface {
+	updateRoutes(map[string]*route.Route) error
+	removeFromServerNetwork(*route.Route) error
+	cleanUp()
+}

client/internal/routemanager/server_android.go

@@ -2,20 +2,11 @@ package routemanager
 
 import (
 	"context"
+	"fmt"
 
 	"github.com/netbirdio/netbird/iface"
-	"github.com/netbirdio/netbird/route"
 )
 
-type serverRouter struct {
+func newServerRouter(context.Context, *iface.WGIface) (serverRouter, error) {
+	return nil, fmt.Errorf("server route not supported on this os")
 }
-
-func newServerRouter(ctx context.Context, wgInterface *iface.WGIface) *serverRouter {
-	return &serverRouter{}
-}
-
-func (r *serverRouter) updateRoutes(routesMap map[string]*route.Route) error {
-	return nil
-}
-
-func (r *serverRouter) cleanUp() {}

client/internal/routemanager/server_nonandroid.go

@@ -13,7 +13,7 @@ import (
 	"github.com/netbirdio/netbird/route"
 )
 
-type serverRouter struct {
+type defaultServerRouter struct {
 	mux         sync.Mutex
 	ctx         context.Context
 	routes      map[string]*route.Route
@@ -21,16 +21,21 @@ type serverRouter struct {
 	wgInterface *iface.WGIface
 }
 
-func newServerRouter(ctx context.Context, wgInterface *iface.WGIface) *serverRouter {
-	return &serverRouter{
+func newServerRouter(ctx context.Context, wgInterface *iface.WGIface) (serverRouter, error) {
+	firewall, err := NewFirewall(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	return &defaultServerRouter{
 		ctx:         ctx,
 		routes:      make(map[string]*route.Route),
-		firewall:    NewFirewall(ctx),
+		firewall:    firewall,
 		wgInterface: wgInterface,
-	}
+	}, nil
 }
 
-func (m *serverRouter) updateRoutes(routesMap map[string]*route.Route) error {
+func (m *defaultServerRouter) updateRoutes(routesMap map[string]*route.Route) error {
 	serverRoutesToRemove := make([]string, 0)
 
 	if len(routesMap) > 0 {
@@ -81,7 +86,7 @@ func (m *serverRouter) updateRoutes(routesMap map[string]*route.Route) error {
 	return nil
 }
 
-func (m *serverRouter) removeFromServerNetwork(route *route.Route) error {
+func (m *defaultServerRouter) removeFromServerNetwork(route *route.Route) error {
 	select {
 	case <-m.ctx.Done():
 		log.Infof("not removing from server network because context is done")
@@ -98,7 +103,7 @@ func (m *serverRouter) removeFromServerNetwork(route *route.Route) error {
 	}
 }
 
-func (m *serverRouter) addToServerNetwork(route *route.Route) error {
+func (m *defaultServerRouter) addToServerNetwork(route *route.Route) error {
 	select {
 	case <-m.ctx.Done():
 		log.Infof("not adding to server network because context is done")
@@ -115,6 +120,6 @@ func (m *serverRouter) addToServerNetwork(route *route.Route) error {
 	}
 }
 
-func (m *serverRouter) cleanUp() {
+func (m *defaultServerRouter) cleanUp() {
 	m.firewall.CleanRoutingRules()
 }

client/internal/stdnet/filter.go

@@ -20,7 +20,7 @@ func InterfaceFilter(disallowList []string) func(string) bool {
 
 		for _, s := range disallowList {
 			if strings.HasPrefix(iFace, s) {
-				log.Debugf("ignoring interface %s - it is not allowed", iFace)
+				log.Tracef("ignoring interface %s - it is not allowed", iFace)
 				return false
 			}
 		}

go.mod

@@ -31,7 +31,7 @@ require (
 	fyne.io/fyne/v2 v2.1.4
 	github.com/c-robinson/iplib v1.0.3
 	github.com/cilium/ebpf v0.10.0
-	github.com/coreos/go-iptables v0.6.0
+	github.com/coreos/go-iptables v0.7.0
 	github.com/creack/pty v1.1.18
 	github.com/eko/gocache/v3 v3.1.1
 	github.com/getlantern/systray v1.2.1

go.sum

@@ -131,8 +131,8 @@ github.com/containerd/typeurl v1.0.2/go.mod h1:9trJWW2sRlGub4wZJRTW83VtbOLS6hwcD
 github.com/coocood/freecache v1.2.1 h1:/v1CqMq45NFH9mp/Pt142reundeBM0dVUD3osQBeu/U=
 github.com/coreos/bbolt v1.3.2/go.mod h1:iRUV2dpdMOn7Bo10OQBFzIJO9kkE559Wcmn+qkEiiKk=
 github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
-github.com/coreos/go-iptables v0.6.0 h1:is9qnZMPYjLd8LYqmm/qlE+wwEgJIkTYdhV3rfZo4jk=
-github.com/coreos/go-iptables v0.6.0/go.mod h1:Qe8Bv2Xik5FyTXwgIbLAnv2sWSBmvWdFETJConOQ//Q=
+github.com/coreos/go-iptables v0.7.0 h1:XWM3V+MPRr5/q51NuWSgU0fqMad64Zyxs8ZUoMsamr8=
+github.com/coreos/go-iptables v0.7.0/go.mod h1:Qe8Bv2Xik5FyTXwgIbLAnv2sWSBmvWdFETJConOQ//Q=
 github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
 github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
 github.com/coreos/go-systemd/v22 v22.0.0/go.mod h1:xO0FLkIi5MaZafQlIrOotqXZ90ih+1atmu1JpKERPPk=