Avoid ebpf lib usage on non Linux

client/internal/dns/service_listener.go

@@ -30,7 +30,7 @@ type serviceViaListener struct {
 	listenPort        int
 	listenerIsRunning bool
 	listenerFlagLock  sync.Mutex
-	ebpfService       *ebpf.Manager
+	ebpfService       ebpf.Manager
 }
 
 func newServiceViaListener(wgIface WGIface, customAddr *netip.AddrPort) *serviceViaListener {
@@ -59,7 +59,7 @@ func (s *serviceViaListener) Listen() error {
 	}
 
 	var err error
-	s.listenIP, s.listenPort, err = s.evalRuntimeAddress()
+	s.listenIP, s.listenPort, err = s.evalListenAddress()
 	if err != nil {
 		log.Errorf("failed to eval runtime address: %s", err)
 		return err
@@ -163,7 +163,7 @@ func (s *serviceViaListener) getFirstListenerAvailable() (string, int, error) {
 	return "", 0, fmt.Errorf("unable to find an unused ip and port combination. IPs tested: %v and ports %v", ips, ports)
 }
 
-func (s *serviceViaListener) evalRuntimeAddress() (string, int, error) {
+func (s *serviceViaListener) evalListenAddress() (string, int, error) {
 	if s.customAddr != nil {
 		return s.customAddr.Addr().String(), int(s.customAddr.Port()), nil
 	}

client/internal/ebpf/dns_fwd_linux.go

@@ -1,3 +1,5 @@
+//go:build !android
+
 package ebpf
 
 import (
@@ -12,7 +14,7 @@ const (
 	mapKeyDNSPort uint32 = 1
 )
 
-func (tf *Manager) LoadDNSFwd(ip string, dnsPort int) error {
+func (tf *GeneralManager) LoadDNSFwd(ip string, dnsPort int) error {
 	log.Debugf("load ebpf DNS forwarder: address: %s:%d", ip, dnsPort)
 	tf.lock.Lock()
 	defer tf.lock.Unlock()
@@ -40,7 +42,7 @@ func (tf *Manager) LoadDNSFwd(ip string, dnsPort int) error {
 	return nil
 }
 
-func (tf *Manager) FreeDNSFwd() error {
+func (tf *GeneralManager) FreeDNSFwd() error {
 	log.Debugf("free ebpf DNS forwarder")
 	return tf.unsetFeatureFlag(featureFlagDnsForwarder)
 }

client/internal/ebpf/manager.go

@@ -0,0 +1,8 @@
+package ebpf
+
+type Manager interface {
+	LoadDNSFwd(ip string, dnsPort int) error
+	FreeDNSFwd() error
+	LoadWgProxy(proxyPort, wgPort int) error
+	FreeWGProxy() error
+}

client/internal/ebpf/manager_linux.go

@@ -1,3 +1,5 @@
+//go:build !android
+
 package ebpf
 
 import (
@@ -18,14 +20,14 @@ const (
 )
 
 var (
-	singleton     *Manager
+	singleton     Manager
 	singletonLock = &sync.Mutex{}
 )
 
-// libbpf-dev, libc6-dev-i386-amd64-cross
+// required packages libbpf-dev, libc6-dev-i386-amd64-cross
 
 //go:generate go run github.com/cilium/ebpf/cmd/bpf2go -cc clang-14 bpf src/prog.c -- -I /usr/x86_64-linux-gnu/include
-type Manager struct {
+type GeneralManager struct {
 	lock         sync.Mutex
 	link         link.Link
 	featureFlags uint16
@@ -33,21 +35,21 @@ type Manager struct {
 }
 
 // GetEbpfManagerInstance return a static eBpf Manager instance
-func GetEbpfManagerInstance() *Manager {
+func GetEbpfManagerInstance() Manager {
 	singletonLock.Lock()
 	defer singletonLock.Unlock()
 	if singleton != nil {
 		return singleton
 	}
-	singleton = &Manager{}
+	singleton = &GeneralManager{}
 	return singleton
 }
 
-func (tf *Manager) setFeatureFlag(feature uint16) {
+func (tf *GeneralManager) setFeatureFlag(feature uint16) {
 	tf.featureFlags = tf.featureFlags | feature
 }
 
-func (tf *Manager) loadXdp() error {
+func (tf *GeneralManager) loadXdp() error {
 	if tf.link != nil {
 		return nil
 	}
@@ -75,7 +77,7 @@ func (tf *Manager) loadXdp() error {
 	return err
 }
 
-func (tf *Manager) unsetFeatureFlag(feature uint16) error {
+func (tf *GeneralManager) unsetFeatureFlag(feature uint16) error {
 	tf.lock.Lock()
 	defer tf.lock.Unlock()
 	tf.featureFlags &^= feature
@@ -91,7 +93,7 @@ func (tf *Manager) unsetFeatureFlag(feature uint16) error {
 	return tf.bpfObjs.NbFeatures.Put(mapKeyFeatures, tf.featureFlags)
 }
 
-func (tf *Manager) close() error {
+func (tf *GeneralManager) close() error {
 	log.Debugf("detach ebpf program ")
 	err := tf.bpfObjs.Close()
 	if err != nil {

client/internal/ebpf/manager_linux_test.go

@@ -5,7 +5,7 @@ import (
 )
 
 func TestManager_setFeatureFlag(t *testing.T) {
-	mgr := Manager{}
+	mgr := GeneralManager{}
 	mgr.setFeatureFlag(featureFlagWGProxy)
 	if mgr.featureFlags != 1 {
 		t.Errorf("invalid faeture state")
@@ -18,7 +18,7 @@ func TestManager_setFeatureFlag(t *testing.T) {
 }
 
 func TestManager_unsetFeatureFlag(t *testing.T) {
-	mgr := Manager{}
+	mgr := GeneralManager{}
 	mgr.setFeatureFlag(featureFlagWGProxy)
 	mgr.setFeatureFlag(featureFlagDnsForwarder)
 

client/internal/ebpf/manager_nonlinux.go

@@ -0,0 +1,8 @@
+//go:build !linux || android
+
+package ebpf
+
+// GetEbpfManagerInstance return error because ebpf is not supported on all os
+func GetEbpfManagerInstance() Manager {
+	panic("unsupported os")
+}

client/internal/ebpf/wg_proxy_linux.go

@@ -1,3 +1,5 @@
+//go:build !android
+
 package ebpf
 
 import log "github.com/sirupsen/logrus"
@@ -7,7 +9,7 @@ const (
 	mapKeyWgPort    uint32 = 1
 )
 
-func (tf *Manager) LoadWgProxy(proxyPort, wgPort int) error {
+func (tf *GeneralManager) LoadWgProxy(proxyPort, wgPort int) error {
 	log.Debugf("load ebpf WG proxy")
 	tf.lock.Lock()
 	defer tf.lock.Unlock()
@@ -35,7 +37,7 @@ func (tf *Manager) LoadWgProxy(proxyPort, wgPort int) error {
 	return nil
 }
 
-func (tf *Manager) FreeWGProxy() error {
+func (tf *GeneralManager) FreeWGProxy() error {
 	log.Debugf("free ebpf WG proxy")
 	return tf.unsetFeatureFlag(featureFlagWGProxy)
 }

client/internal/wgproxy/proxy_ebpf.go

@@ -19,7 +19,7 @@ import (
 
 // WGEBPFProxy definition for proxy with EBPF support
 type WGEBPFProxy struct {
-	ebpfManager       *ebpf.Manager
+	ebpfManager       ebpf.Manager
 	lastUsedPort      uint16
 	localWGListenPort int