From 9cc9462cd5d7908503c6c59c2785be43e575c397 Mon Sep 17 00:00:00 2001
From: Viktor Liu <17948409+lixmal@users.noreply.github.com>
Date: Thu, 13 Nov 2025 20:16:45 +0100
Subject: [PATCH 1/2] [client] Use stdnet with a context to avoid DNS deadlocks
 (#4781)

---
 client/iface/iface_test.go                    |  21 ++--
 client/iface/udpmux/mux.go                    |   6 +-
 client/internal/dns/server_test.go            |   6 +-
 client/internal/engine_stdnet.go              |   2 +-
 client/internal/engine_stdnet_android.go      |   2 +-
 client/internal/engine_test.go                |   6 +-
 client/internal/peer/guard/ice_monitor.go     |   2 +-
 client/internal/peer/ice/agent.go             |   5 +-
 client/internal/peer/ice/stdnet.go            |   6 +-
 client/internal/peer/ice/stdnet_android.go    |  10 +-
 client/internal/peer/worker_ice.go            |   2 +-
 client/internal/relay/relay.go                |   4 +-
 client/internal/routemanager/manager_test.go  |   4 +-
 .../systemops/systemops_generic_test.go       |   4 +-
 client/internal/stdnet/stdnet.go              | 112 +++++++++++++++++-
 15 files changed, 153 insertions(+), 39 deletions(-)

diff --git a/client/iface/iface_test.go b/client/iface/iface_test.go
index e890b30f3..6bbfeaa63 100644
--- a/client/iface/iface_test.go
+++ b/client/iface/iface_test.go
@@ -1,6 +1,7 @@
 package iface
 
 import (
+	"context"
 	"fmt"
 	"net"
 	"net/netip"
@@ -9,13 +10,13 @@ import (
 	"time"
 
 	"github.com/google/uuid"
-	"github.com/pion/transport/v3/stdnet"
 	log "github.com/sirupsen/logrus"
 	"github.com/stretchr/testify/assert"
 	"golang.zx2c4.com/wireguard/wgctrl"
 	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
 
 	"github.com/netbirdio/netbird/client/iface/device"
+	"github.com/netbirdio/netbird/client/internal/stdnet"
 )
 
 // keep darwin compatibility
@@ -40,7 +41,7 @@ func TestWGIface_UpdateAddr(t *testing.T) {
 	ifaceName := fmt.Sprintf("utun%d", WgIntNumber+4)
 	addr := "100.64.0.1/8"
 	wgPort := 33100
-	newNet, err := stdnet.NewNet()
+	newNet, err := stdnet.NewNet(context.Background(), nil)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -123,7 +124,7 @@ func getIfaceAddrs(ifaceName string) ([]net.Addr, error) {
 func Test_CreateInterface(t *testing.T) {
 	ifaceName := fmt.Sprintf("utun%d", WgIntNumber+1)
 	wgIP := "10.99.99.1/32"
-	newNet, err := stdnet.NewNet()
+	newNet, err := stdnet.NewNet(context.Background(), nil)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -166,7 +167,7 @@ func Test_Close(t *testing.T) {
 	ifaceName := fmt.Sprintf("utun%d", WgIntNumber+2)
 	wgIP := "10.99.99.2/32"
 	wgPort := 33100
-	newNet, err := stdnet.NewNet()
+	newNet, err := stdnet.NewNet(context.Background(), nil)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -211,7 +212,7 @@ func TestRecreation(t *testing.T) {
 			ifaceName := fmt.Sprintf("utun%d", WgIntNumber+2)
 			wgIP := "10.99.99.2/32"
 			wgPort := 33100
-			newNet, err := stdnet.NewNet()
+			newNet, err := stdnet.NewNet(context.Background(), nil)
 			if err != nil {
 				t.Fatal(err)
 			}
@@ -284,7 +285,7 @@ func Test_ConfigureInterface(t *testing.T) {
 	ifaceName := fmt.Sprintf("utun%d", WgIntNumber+3)
 	wgIP := "10.99.99.5/30"
 	wgPort := 33100
-	newNet, err := stdnet.NewNet()
+	newNet, err := stdnet.NewNet(context.Background(), nil)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -339,7 +340,7 @@ func Test_ConfigureInterface(t *testing.T) {
 func Test_UpdatePeer(t *testing.T) {
 	ifaceName := fmt.Sprintf("utun%d", WgIntNumber+4)
 	wgIP := "10.99.99.9/30"
-	newNet, err := stdnet.NewNet()
+	newNet, err := stdnet.NewNet(context.Background(), nil)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -409,7 +410,7 @@ func Test_UpdatePeer(t *testing.T) {
 func Test_RemovePeer(t *testing.T) {
 	ifaceName := fmt.Sprintf("utun%d", WgIntNumber+4)
 	wgIP := "10.99.99.13/30"
-	newNet, err := stdnet.NewNet()
+	newNet, err := stdnet.NewNet(context.Background(), nil)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -471,7 +472,7 @@ func Test_ConnectPeers(t *testing.T) {
 	peer2wgPort := 33200
 
 	keepAlive := 1 * time.Second
-	newNet, err := stdnet.NewNet()
+	newNet, err := stdnet.NewNet(context.Background(), nil)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -514,7 +515,7 @@ func Test_ConnectPeers(t *testing.T) {
 	guid = fmt.Sprintf("{%s}", uuid.New().String())
 	device.CustomWindowsGUIDString = strings.ToLower(guid)
 
-	newNet, err = stdnet.NewNet()
+	newNet, err = stdnet.NewNet(context.Background(), nil)
 	if err != nil {
 		t.Fatal(err)
 	}
diff --git a/client/iface/udpmux/mux.go b/client/iface/udpmux/mux.go
index 319724926..c5d2de4a5 100644
--- a/client/iface/udpmux/mux.go
+++ b/client/iface/udpmux/mux.go
@@ -1,6 +1,7 @@
 package udpmux
 
 import (
+	"context"
 	"fmt"
 	"io"
 	"net"
@@ -12,8 +13,9 @@ import (
 	"github.com/pion/logging"
 	"github.com/pion/stun/v3"
 	"github.com/pion/transport/v3"
-	"github.com/pion/transport/v3/stdnet"
 	log "github.com/sirupsen/logrus"
+
+	"github.com/netbirdio/netbird/client/internal/stdnet"
 )
 
 /*
@@ -199,7 +201,7 @@ func (m *SingleSocketUDPMux) updateLocalAddresses() {
 		if len(networks) > 0 {
 			if m.params.Net == nil {
 				var err error
-				if m.params.Net, err = stdnet.NewNet(); err != nil {
+				if m.params.Net, err = stdnet.NewNet(context.Background(), nil); err != nil {
 					m.params.Logger.Errorf("failed to get create network: %v", err)
 				}
 			}
diff --git a/client/internal/dns/server_test.go b/client/internal/dns/server_test.go
index 451b83f92..d12070128 100644
--- a/client/internal/dns/server_test.go
+++ b/client/internal/dns/server_test.go
@@ -335,7 +335,7 @@ func TestUpdateDNSServer(t *testing.T) {
 	for n, testCase := range testCases {
 		t.Run(testCase.name, func(t *testing.T) {
 			privKey, _ := wgtypes.GenerateKey()
-			newNet, err := stdnet.NewNet(nil)
+			newNet, err := stdnet.NewNet(context.Background(), nil)
 			if err != nil {
 				t.Fatal(err)
 			}
@@ -434,7 +434,7 @@ func TestDNSFakeResolverHandleUpdates(t *testing.T) {
 	defer t.Setenv("NB_WG_KERNEL_DISABLED", ov)
 
 	t.Setenv("NB_WG_KERNEL_DISABLED", "true")
-	newNet, err := stdnet.NewNet([]string{"utun2301"})
+	newNet, err := stdnet.NewNet(context.Background(), []string{"utun2301"})
 	if err != nil {
 		t.Errorf("create stdnet: %v", err)
 		return
@@ -915,7 +915,7 @@ func createWgInterfaceWithBind(t *testing.T) (*iface.WGIface, error) {
 	defer t.Setenv("NB_WG_KERNEL_DISABLED", ov)
 
 	t.Setenv("NB_WG_KERNEL_DISABLED", "true")
-	newNet, err := stdnet.NewNet([]string{"utun2301"})
+	newNet, err := stdnet.NewNet(context.Background(), []string{"utun2301"})
 	if err != nil {
 		t.Fatalf("create stdnet: %v", err)
 		return nil, err
diff --git a/client/internal/engine_stdnet.go b/client/internal/engine_stdnet.go
index 9e171b0b2..1ebb5779c 100644
--- a/client/internal/engine_stdnet.go
+++ b/client/internal/engine_stdnet.go
@@ -7,5 +7,5 @@ import (
 )
 
 func (e *Engine) newStdNet() (*stdnet.Net, error) {
-	return stdnet.NewNet(e.config.IFaceBlackList)
+	return stdnet.NewNet(e.clientCtx, e.config.IFaceBlackList)
 }
diff --git a/client/internal/engine_stdnet_android.go b/client/internal/engine_stdnet_android.go
index 68a0ae719..de3c80bcf 100644
--- a/client/internal/engine_stdnet_android.go
+++ b/client/internal/engine_stdnet_android.go
@@ -3,5 +3,5 @@ package internal
 import "github.com/netbirdio/netbird/client/internal/stdnet"
 
 func (e *Engine) newStdNet() (*stdnet.Net, error) {
-	return stdnet.NewNetWithDiscover(e.mobileDep.IFaceDiscover, e.config.IFaceBlackList)
+	return stdnet.NewNetWithDiscover(e.clientCtx, e.mobileDep.IFaceDiscover, e.config.IFaceBlackList)
 }
diff --git a/client/internal/engine_test.go b/client/internal/engine_test.go
index 15ac0a947..d15a07f9d 100644
--- a/client/internal/engine_test.go
+++ b/client/internal/engine_test.go
@@ -14,7 +14,7 @@ import (
 
 	"github.com/golang/mock/gomock"
 	"github.com/google/uuid"
-	"github.com/pion/transport/v3/stdnet"
+	"github.com/netbirdio/netbird/client/internal/stdnet"
 	log "github.com/sirupsen/logrus"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
@@ -774,7 +774,7 @@ func TestEngine_UpdateNetworkMapWithRoutes(t *testing.T) {
 				MTU:          iface.DefaultMTU,
 			}, MobileDependency{}, peer.NewRecorder("https://mgm"), nil)
 			engine.ctx = ctx
-			newNet, err := stdnet.NewNet()
+			newNet, err := stdnet.NewNet(context.Background(), nil)
 			if err != nil {
 				t.Fatal(err)
 			}
@@ -977,7 +977,7 @@ func TestEngine_UpdateNetworkMapWithDNSUpdate(t *testing.T) {
 			}, MobileDependency{}, peer.NewRecorder("https://mgm"), nil)
 			engine.ctx = ctx
 
-			newNet, err := stdnet.NewNet()
+			newNet, err := stdnet.NewNet(context.Background(), nil)
 			if err != nil {
 				t.Fatal(err)
 			}
diff --git a/client/internal/peer/guard/ice_monitor.go b/client/internal/peer/guard/ice_monitor.go
index 0f22ee7b0..a201dd095 100644
--- a/client/internal/peer/guard/ice_monitor.go
+++ b/client/internal/peer/guard/ice_monitor.go
@@ -78,7 +78,7 @@ func (cm *ICEMonitor) Start(ctx context.Context, onChanged func()) {
 func (cm *ICEMonitor) handleCandidateTick(ctx context.Context, ufrag string, pwd string) (bool, error) {
 	log.Debugf("Gathering ICE candidates")
 
-	agent, err := icemaker.NewAgent(cm.iFaceDiscover, cm.iceConfig, candidateTypesP2P(), ufrag, pwd)
+	agent, err := icemaker.NewAgent(ctx, cm.iFaceDiscover, cm.iceConfig, candidateTypesP2P(), ufrag, pwd)
 	if err != nil {
 		return false, fmt.Errorf("create ICE agent: %w", err)
 	}
diff --git a/client/internal/peer/ice/agent.go b/client/internal/peer/ice/agent.go
index 7b929c29d..79f68d279 100644
--- a/client/internal/peer/ice/agent.go
+++ b/client/internal/peer/ice/agent.go
@@ -1,6 +1,7 @@
 package ice
 
 import (
+	"context"
 	"sync"
 	"time"
 
@@ -49,13 +50,13 @@ func (a *ThreadSafeAgent) Close() error {
 	return err
 }
 
-func NewAgent(iFaceDiscover stdnet.ExternalIFaceDiscover, config Config, candidateTypes []ice.CandidateType, ufrag string, pwd string) (*ThreadSafeAgent, error) {
+func NewAgent(ctx context.Context, iFaceDiscover stdnet.ExternalIFaceDiscover, config Config, candidateTypes []ice.CandidateType, ufrag string, pwd string) (*ThreadSafeAgent, error) {
 	iceKeepAlive := iceKeepAlive()
 	iceDisconnectedTimeout := iceDisconnectedTimeout()
 	iceFailedTimeout := iceFailedTimeout()
 	iceRelayAcceptanceMinWait := iceRelayAcceptanceMinWait()
 
-	transportNet, err := newStdNet(iFaceDiscover, config.InterfaceBlackList)
+	transportNet, err := newStdNet(ctx, iFaceDiscover, config.InterfaceBlackList)
 	if err != nil {
 		log.Errorf("failed to create pion's stdnet: %s", err)
 	}
diff --git a/client/internal/peer/ice/stdnet.go b/client/internal/peer/ice/stdnet.go
index 3ce83727e..685ed0363 100644
--- a/client/internal/peer/ice/stdnet.go
+++ b/client/internal/peer/ice/stdnet.go
@@ -3,9 +3,11 @@
 package ice
 
 import (
+	"context"
+
 	"github.com/netbirdio/netbird/client/internal/stdnet"
 )
 
-func newStdNet(_ stdnet.ExternalIFaceDiscover, ifaceBlacklist []string) (*stdnet.Net, error) {
-	return stdnet.NewNet(ifaceBlacklist)
+func newStdNet(ctx context.Context, _ stdnet.ExternalIFaceDiscover, ifaceBlacklist []string) (*stdnet.Net, error) {
+	return stdnet.NewNet(ctx, ifaceBlacklist)
 }
diff --git a/client/internal/peer/ice/stdnet_android.go b/client/internal/peer/ice/stdnet_android.go
index 84c665e6f..5033ec1b9 100644
--- a/client/internal/peer/ice/stdnet_android.go
+++ b/client/internal/peer/ice/stdnet_android.go
@@ -1,7 +1,11 @@
 package ice
 
-import "github.com/netbirdio/netbird/client/internal/stdnet"
+import (
+	"context"
 
-func newStdNet(iFaceDiscover stdnet.ExternalIFaceDiscover, ifaceBlacklist []string) (*stdnet.Net, error) {
-	return stdnet.NewNetWithDiscover(iFaceDiscover, ifaceBlacklist)
+	"github.com/netbirdio/netbird/client/internal/stdnet"
+)
+
+func newStdNet(ctx context.Context, iFaceDiscover stdnet.ExternalIFaceDiscover, ifaceBlacklist []string) (*stdnet.Net, error) {
+	return stdnet.NewNetWithDiscover(ctx, iFaceDiscover, ifaceBlacklist)
 }
diff --git a/client/internal/peer/worker_ice.go b/client/internal/peer/worker_ice.go
index 5d8ebfe45..840fc9241 100644
--- a/client/internal/peer/worker_ice.go
+++ b/client/internal/peer/worker_ice.go
@@ -209,7 +209,7 @@ func (w *WorkerICE) Close() {
 }
 
 func (w *WorkerICE) reCreateAgent(dialerCancel context.CancelFunc, candidates []ice.CandidateType) (*icemaker.ThreadSafeAgent, error) {
-	agent, err := icemaker.NewAgent(w.iFaceDiscover, w.config.ICEConfig, candidates, w.localUfrag, w.localPwd)
+	agent, err := icemaker.NewAgent(w.ctx, w.iFaceDiscover, w.config.ICEConfig, candidates, w.localUfrag, w.localPwd)
 	if err != nil {
 		return nil, fmt.Errorf("create agent: %w", err)
 	}
diff --git a/client/internal/relay/relay.go b/client/internal/relay/relay.go
index 693ea1f31..59be5b0a7 100644
--- a/client/internal/relay/relay.go
+++ b/client/internal/relay/relay.go
@@ -197,7 +197,7 @@ func (p *StunTurnProbe) probeSTUN(ctx context.Context, uri *stun.URI) (addr stri
 		}
 	}()
 
-	net, err := stdnet.NewNet(nil)
+	net, err := stdnet.NewNet(ctx, nil)
 	if err != nil {
 		probeErr = fmt.Errorf("new net: %w", err)
 		return
@@ -286,7 +286,7 @@ func (p *StunTurnProbe) probeTURN(ctx context.Context, uri *stun.URI) (addr stri
 		}
 	}()
 
-	net, err := stdnet.NewNet(nil)
+	net, err := stdnet.NewNet(ctx, nil)
 	if err != nil {
 		probeErr = fmt.Errorf("new net: %w", err)
 		return
diff --git a/client/internal/routemanager/manager_test.go b/client/internal/routemanager/manager_test.go
index d2f02526c..3697545ae 100644
--- a/client/internal/routemanager/manager_test.go
+++ b/client/internal/routemanager/manager_test.go
@@ -6,7 +6,7 @@ import (
 	"net/netip"
 	"testing"
 
-	"github.com/pion/transport/v3/stdnet"
+	"github.com/netbirdio/netbird/client/internal/stdnet"
 	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
 
 	"github.com/stretchr/testify/require"
@@ -403,7 +403,7 @@ func TestManagerUpdateRoutes(t *testing.T) {
 	for n, testCase := range testCases {
 		t.Run(testCase.name, func(t *testing.T) {
 			peerPrivateKey, _ := wgtypes.GeneratePrivateKey()
-			newNet, err := stdnet.NewNet()
+			newNet, err := stdnet.NewNet(context.Background(), nil)
 			if err != nil {
 				t.Fatal(err)
 			}
diff --git a/client/internal/routemanager/systemops/systemops_generic_test.go b/client/internal/routemanager/systemops/systemops_generic_test.go
index d9b109beb..01916fbe3 100644
--- a/client/internal/routemanager/systemops/systemops_generic_test.go
+++ b/client/internal/routemanager/systemops/systemops_generic_test.go
@@ -15,7 +15,7 @@ import (
 	"syscall"
 	"testing"
 
-	"github.com/pion/transport/v3/stdnet"
+	"github.com/netbirdio/netbird/client/internal/stdnet"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
@@ -436,7 +436,7 @@ func createWGInterface(t *testing.T, interfaceName, ipAddressCIDR string, listen
 	peerPrivateKey, err := wgtypes.GeneratePrivateKey()
 	require.NoError(t, err)
 
-	newNet, err := stdnet.NewNet()
+	newNet, err := stdnet.NewNet(context.Background(), nil)
 	require.NoError(t, err)
 
 	opts := iface.WGIFaceOpts{
diff --git a/client/internal/stdnet/stdnet.go b/client/internal/stdnet/stdnet.go
index 4b031c05c..381886ac6 100644
--- a/client/internal/stdnet/stdnet.go
+++ b/client/internal/stdnet/stdnet.go
@@ -4,17 +4,28 @@
 package stdnet
 
 import (
+	"context"
+	"errors"
 	"fmt"
+	"net"
+	"net/netip"
 	"slices"
+	"strconv"
 	"sync"
 	"time"
 
-	"github.com/netbirdio/netbird/client/iface/netstack"
 	"github.com/pion/transport/v3"
 	"github.com/pion/transport/v3/stdnet"
+
+	"github.com/netbirdio/netbird/client/iface/netstack"
 )
 
-const updateInterval = 30 * time.Second
+const (
+	updateInterval    = 30 * time.Second
+	dnsResolveTimeout = 30 * time.Second
+)
+
+var errNoSuitableAddress = errors.New("no suitable address found")
 
 // Net is an implementation of the net.Net interface
 // based on functions of the standard net package.
@@ -28,12 +39,19 @@ type Net struct {
 
 	// mu is shared between interfaces and lastUpdate
 	mu sync.Mutex
+
+	// ctx is the context for network operations that supports cancellation
+	ctx context.Context
 }
 
 // NewNetWithDiscover creates a new StdNet instance.
-func NewNetWithDiscover(iFaceDiscover ExternalIFaceDiscover, disallowList []string) (*Net, error) {
+func NewNetWithDiscover(ctx context.Context, iFaceDiscover ExternalIFaceDiscover, disallowList []string) (*Net, error) {
+	if ctx == nil {
+		ctx = context.Background()
+	}
 	n := &Net{
 		interfaceFilter: InterfaceFilter(disallowList),
+		ctx:             ctx,
 	}
 	// current ExternalIFaceDiscover implement in android-client https://github.dev/netbirdio/android-client
 	// so in android cli use pionDiscover
@@ -46,14 +64,64 @@ func NewNetWithDiscover(iFaceDiscover ExternalIFaceDiscover, disallowList []stri
 }
 
 // NewNet creates a new StdNet instance.
-func NewNet(disallowList []string) (*Net, error) {
+func NewNet(ctx context.Context, disallowList []string) (*Net, error) {
+	if ctx == nil {
+		ctx = context.Background()
+	}
 	n := &Net{
 		iFaceDiscover:   pionDiscover{},
 		interfaceFilter: InterfaceFilter(disallowList),
+		ctx:             ctx,
 	}
 	return n, n.UpdateInterfaces()
 }
 
+// resolveAddr performs DNS resolution with context support and timeout.
+func (n *Net) resolveAddr(network, address string) (netip.AddrPort, error) {
+	host, portStr, err := net.SplitHostPort(address)
+	if err != nil {
+		return netip.AddrPort{}, err
+	}
+
+	port, err := strconv.Atoi(portStr)
+	if err != nil {
+		return netip.AddrPort{}, fmt.Errorf("invalid port: %w", err)
+	}
+	if port < 0 || port > 65535 {
+		return netip.AddrPort{}, fmt.Errorf("invalid port: %d", port)
+	}
+
+	ipNet := "ip"
+	switch network {
+	case "tcp4", "udp4":
+		ipNet = "ip4"
+	case "tcp6", "udp6":
+		ipNet = "ip6"
+	}
+
+	if host == "" {
+		addr := netip.IPv4Unspecified()
+		if ipNet == "ip6" {
+			addr = netip.IPv6Unspecified()
+		}
+		return netip.AddrPortFrom(addr, uint16(port)), nil
+	}
+
+	ctx, cancel := context.WithTimeout(n.ctx, dnsResolveTimeout)
+	defer cancel()
+
+	addrs, err := net.DefaultResolver.LookupNetIP(ctx, ipNet, host)
+	if err != nil {
+		return netip.AddrPort{}, err
+	}
+
+	if len(addrs) == 0 {
+		return netip.AddrPort{}, errNoSuitableAddress
+	}
+
+	return netip.AddrPortFrom(addrs[0], uint16(port)), nil
+}
+
 // UpdateInterfaces updates the internal list of network interfaces
 // and associated addresses filtering them by name.
 // The interfaces are discovered by an external iFaceDiscover function or by a default discoverer if the external one
@@ -137,3 +205,39 @@ func (n *Net) filterInterfaces(interfaces []*transport.Interface) []*transport.I
 	}
 	return result
 }
+
+// ResolveUDPAddr resolves UDP addresses with context support and timeout.
+func (n *Net) ResolveUDPAddr(network, address string) (*net.UDPAddr, error) {
+	switch network {
+	case "udp", "udp4", "udp6":
+	case "":
+		network = "udp"
+	default:
+		return nil, &net.OpError{Op: "resolve", Net: network, Err: net.UnknownNetworkError(network)}
+	}
+
+	addrPort, err := n.resolveAddr(network, address)
+	if err != nil {
+		return nil, &net.OpError{Op: "resolve", Net: network, Addr: &net.UDPAddr{IP: nil}, Err: err}
+	}
+
+	return net.UDPAddrFromAddrPort(addrPort), nil
+}
+
+// ResolveTCPAddr resolves TCP addresses with context support and timeout.
+func (n *Net) ResolveTCPAddr(network, address string) (*net.TCPAddr, error) {
+	switch network {
+	case "tcp", "tcp4", "tcp6":
+	case "":
+		network = "tcp"
+	default:
+		return nil, &net.OpError{Op: "resolve", Net: network, Err: net.UnknownNetworkError(network)}
+	}
+
+	addrPort, err := n.resolveAddr(network, address)
+	if err != nil {
+		return nil, &net.OpError{Op: "resolve", Net: network, Addr: &net.TCPAddr{IP: nil}, Err: err}
+	}
+
+	return net.TCPAddrFromAddrPort(addrPort), nil
+}

From e4b41d0ad70676b3f3f4a18f621b5467bd1c509c Mon Sep 17 00:00:00 2001
From: Viktor Liu <17948409+lixmal@users.noreply.github.com>
Date: Fri, 14 Nov 2025 00:25:00 +0100
Subject: [PATCH 2/2] [client] Replace ipset lib (#4777)

* Replace ipset lib

* Update .github/workflows/check-license-dependencies.yml

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

* Ignore internal licenses

* Ignore dependencies from AGPL code

* Use exported errors

* Use fixed version

---------

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
---
 .../workflows/check-license-dependencies.yml  |  73 +++++++++-
 client/firewall/iptables/acl_linux.go         | 135 ++++++++++++++----
 client/firewall/iptables/router_linux.go      |  50 +++++--
 go.mod                                        |   6 +-
 go.sum                                        |  12 +-
 5 files changed, 225 insertions(+), 51 deletions(-)

diff --git a/.github/workflows/check-license-dependencies.yml b/.github/workflows/check-license-dependencies.yml
index d3da427b0..2a3e7d424 100644
--- a/.github/workflows/check-license-dependencies.yml
+++ b/.github/workflows/check-license-dependencies.yml
@@ -3,10 +3,19 @@ name: Check License Dependencies
 on:
   push:
     branches: [ main ]
+    paths:
+      - 'go.mod'
+      - 'go.sum'
+      - '.github/workflows/check-license-dependencies.yml'
   pull_request:
+    paths:
+      - 'go.mod'
+      - 'go.sum'
+      - '.github/workflows/check-license-dependencies.yml'
 
 jobs:
-  check-dependencies:
+  check-internal-dependencies:
+    name: Check Internal AGPL Dependencies
     runs-on: ubuntu-latest
 
     steps:
@@ -33,9 +42,67 @@ jobs:
         if [ $FOUND_ISSUES -eq 1 ]; then
           echo ""
           echo "❌ Found dependencies on management/, signal/, or relay/ packages"
-          echo "These packages will change license and should not be imported by client or shared code"
+          echo "These packages are licensed under AGPLv3 and must not be imported by BSD-licensed code"
           exit 1
         else
           echo ""
-          echo "✅ All license dependencies are clean"
+          echo "✅ All internal license dependencies are clean"
         fi
+
+  check-external-licenses:
+    name: Check External GPL/AGPL Licenses
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Set up Go
+      uses: actions/setup-go@v5
+      with:
+        go-version-file: 'go.mod'
+        cache: true
+
+    - name: Install go-licenses
+      run: go install github.com/google/go-licenses@v1.6.0
+
+    - name: Check for GPL/AGPL licensed dependencies
+      run: |
+        echo "Checking for GPL/AGPL/LGPL licensed dependencies..."
+        echo ""
+
+        # Check all Go packages for copyleft licenses, excluding internal netbird packages
+        COPYLEFT_DEPS=$(go-licenses report ./... 2>/dev/null | grep -E 'GPL|AGPL|LGPL' | grep -v 'github.com/netbirdio/netbird/' || true)
+
+        if [ -n "$COPYLEFT_DEPS" ]; then
+          echo "Found copyleft licensed dependencies:"
+          echo "$COPYLEFT_DEPS"
+          echo ""
+
+          # Filter out dependencies that are only pulled in by internal AGPL packages
+          INCOMPATIBLE=""
+          while IFS=',' read -r package url license; do
+            if echo "$license" | grep -qE 'GPL-[0-9]|AGPL-[0-9]|LGPL-[0-9]'; then
+              # Find ALL packages that import this GPL package using go list
+              IMPORTERS=$(go list -json -deps ./... 2>/dev/null | jq -r "select(.Imports[]? == \"$package\") | .ImportPath")
+
+              # Check if any importer is NOT in management/signal/relay
+              BSD_IMPORTER=$(echo "$IMPORTERS" | grep -v "github.com/netbirdio/netbird/\(management\|signal\|relay\)" | head -1)
+
+              if [ -n "$BSD_IMPORTER" ]; then
+                echo "❌ $package ($license) is imported by BSD-licensed code: $BSD_IMPORTER"
+                INCOMPATIBLE="${INCOMPATIBLE}${package},${url},${license}\n"
+              else
+                echo "✓ $package ($license) is only used by internal AGPL packages - OK"
+              fi
+            fi
+          done <<< "$COPYLEFT_DEPS"
+
+          if [ -n "$INCOMPATIBLE" ]; then
+            echo ""
+            echo "❌ INCOMPATIBLE licenses found that are used by BSD-licensed code:"
+            echo -e "$INCOMPATIBLE"
+            exit 1
+          fi
+        fi
+
+        echo "✅ All external license dependencies are compatible with BSD-3-Clause"
diff --git a/client/firewall/iptables/acl_linux.go b/client/firewall/iptables/acl_linux.go
index d78372c9e..5ccaf17ba 100644
--- a/client/firewall/iptables/acl_linux.go
+++ b/client/firewall/iptables/acl_linux.go
@@ -1,13 +1,14 @@
 package iptables
 
 import (
+	"errors"
 	"fmt"
 	"net"
 	"slices"
 
 	"github.com/coreos/go-iptables/iptables"
 	"github.com/google/uuid"
-	"github.com/nadoo/ipset"
+	ipset "github.com/lrh3321/ipset-go"
 	log "github.com/sirupsen/logrus"
 
 	firewall "github.com/netbirdio/netbird/client/firewall/manager"
@@ -40,19 +41,13 @@ type aclManager struct {
 }
 
 func newAclManager(iptablesClient *iptables.IPTables, wgIface iFaceMapper) (*aclManager, error) {
-	m := &aclManager{
+	return &aclManager{
 		iptablesClient:  iptablesClient,
 		wgIface:         wgIface,
 		entries:         make(map[string][][]string),
 		optionalEntries: make(map[string][]entry),
 		ipsetStore:      newIpsetStore(),
-	}
-
-	if err := ipset.Init(); err != nil {
-		return nil, fmt.Errorf("init ipset: %w", err)
-	}
-
-	return m, nil
+	}, nil
 }
 
 func (m *aclManager) init(stateManager *statemanager.Manager) error {
@@ -98,8 +93,8 @@ func (m *aclManager) AddPeerFiltering(
 	specs = append(specs, "-j", actionToStr(action))
 	if ipsetName != "" {
 		if ipList, ipsetExists := m.ipsetStore.ipset(ipsetName); ipsetExists {
-			if err := ipset.Add(ipsetName, ip.String()); err != nil {
-				return nil, fmt.Errorf("failed to add IP to ipset: %w", err)
+			if err := m.addToIPSet(ipsetName, ip); err != nil {
+				return nil, fmt.Errorf("add IP to ipset: %w", err)
 			}
 			// if ruleset already exists it means we already have the firewall rule
 			// so we need to update IPs in the ruleset and return new fw.Rule object for ACL manager.
@@ -113,14 +108,18 @@ func (m *aclManager) AddPeerFiltering(
 			}}, nil
 		}
 
-		if err := ipset.Flush(ipsetName); err != nil {
-			log.Errorf("flush ipset %s before use it: %s", ipsetName, err)
+		if err := m.flushIPSet(ipsetName); err != nil {
+			if errors.Is(err, ipset.ErrSetNotExist) {
+				log.Debugf("flush ipset %s before use: %v", ipsetName, err)
+			} else {
+				log.Errorf("flush ipset %s before use: %v", ipsetName, err)
+			}
 		}
-		if err := ipset.Create(ipsetName); err != nil {
-			return nil, fmt.Errorf("failed to create ipset: %w", err)
+		if err := m.createIPSet(ipsetName); err != nil {
+			return nil, fmt.Errorf("create ipset: %w", err)
 		}
-		if err := ipset.Add(ipsetName, ip.String()); err != nil {
-			return nil, fmt.Errorf("failed to add IP to ipset: %w", err)
+		if err := m.addToIPSet(ipsetName, ip); err != nil {
+			return nil, fmt.Errorf("add IP to ipset: %w", err)
 		}
 
 		ipList := newIpList(ip.String())
@@ -172,11 +171,16 @@ func (m *aclManager) DeletePeerRule(rule firewall.Rule) error {
 		return fmt.Errorf("invalid rule type")
 	}
 
+	shouldDestroyIpset := false
 	if ipsetList, ok := m.ipsetStore.ipset(r.ipsetName); ok {
 		// delete IP from ruleset IPs list and ipset
 		if _, ok := ipsetList.ips[r.ip]; ok {
-			if err := ipset.Del(r.ipsetName, r.ip); err != nil {
-				return fmt.Errorf("failed to delete ip from ipset: %w", err)
+			ip := net.ParseIP(r.ip)
+			if ip == nil {
+				return fmt.Errorf("parse IP %s", r.ip)
+			}
+			if err := m.delFromIPSet(r.ipsetName, ip); err != nil {
+				return fmt.Errorf("delete ip from ipset: %w", err)
 			}
 			delete(ipsetList.ips, r.ip)
 		}
@@ -190,10 +194,7 @@ func (m *aclManager) DeletePeerRule(rule firewall.Rule) error {
 		// we delete last IP from the set, that means we need to delete
 		// set itself and associated firewall rule too
 		m.ipsetStore.deleteIpset(r.ipsetName)
-
-		if err := ipset.Destroy(r.ipsetName); err != nil {
-			log.Errorf("delete empty ipset: %v", err)
-		}
+		shouldDestroyIpset = true
 	}
 
 	if err := m.iptablesClient.Delete(tableName, r.chain, r.specs...); err != nil {
@@ -206,6 +207,16 @@ func (m *aclManager) DeletePeerRule(rule firewall.Rule) error {
 		}
 	}
 
+	if shouldDestroyIpset {
+		if err := m.destroyIPSet(r.ipsetName); err != nil {
+			if errors.Is(err, ipset.ErrBusy) || errors.Is(err, ipset.ErrSetNotExist) {
+				log.Debugf("destroy empty ipset: %v", err)
+			} else {
+				log.Errorf("destroy empty ipset: %v", err)
+			}
+		}
+	}
+
 	m.updateState()
 
 	return nil
@@ -264,11 +275,19 @@ func (m *aclManager) cleanChains() error {
 	}
 
 	for _, ipsetName := range m.ipsetStore.ipsetNames() {
-		if err := ipset.Flush(ipsetName); err != nil {
-			log.Errorf("flush ipset %q during reset: %v", ipsetName, err)
+		if err := m.flushIPSet(ipsetName); err != nil {
+			if errors.Is(err, ipset.ErrSetNotExist) {
+				log.Debugf("flush ipset %q during reset: %v", ipsetName, err)
+			} else {
+				log.Errorf("flush ipset %q during reset: %v", ipsetName, err)
+			}
 		}
-		if err := ipset.Destroy(ipsetName); err != nil {
-			log.Errorf("delete ipset %q during reset: %v", ipsetName, err)
+		if err := m.destroyIPSet(ipsetName); err != nil {
+			if errors.Is(err, ipset.ErrBusy) || errors.Is(err, ipset.ErrSetNotExist) {
+				log.Debugf("destroy ipset %q during reset: %v", ipsetName, err)
+			} else {
+				log.Errorf("destroy ipset %q during reset: %v", ipsetName, err)
+			}
 		}
 		m.ipsetStore.deleteIpset(ipsetName)
 	}
@@ -368,8 +387,8 @@ func (m *aclManager) updateState() {
 // filterRuleSpecs returns the specs of a filtering rule
 func filterRuleSpecs(ip net.IP, protocol string, sPort, dPort *firewall.Port, action firewall.Action, ipsetName string) (specs []string) {
 	matchByIP := true
-	// don't use IP matching if IP is ip 0.0.0.0
-	if ip.String() == "0.0.0.0" {
+	// don't use IP matching if IP is 0.0.0.0
+	if ip.IsUnspecified() {
 		matchByIP = false
 	}
 
@@ -416,3 +435,61 @@ func transformIPsetName(ipsetName string, sPort, dPort *firewall.Port, action fi
 		return ipsetName + actionSuffix
 	}
 }
+
+func (m *aclManager) createIPSet(name string) error {
+	opts := ipset.CreateOptions{
+		Replace: true,
+	}
+
+	if err := ipset.Create(name, ipset.TypeHashNet, opts); err != nil {
+		return fmt.Errorf("create ipset %s: %w", name, err)
+	}
+
+	log.Debugf("created ipset %s with type hash:net", name)
+	return nil
+}
+
+func (m *aclManager) addToIPSet(name string, ip net.IP) error {
+	cidr := uint8(32)
+	if ip.To4() == nil {
+		cidr = 128
+	}
+
+	entry := &ipset.Entry{
+		IP:      ip,
+		CIDR:    cidr,
+		Replace: true,
+	}
+
+	if err := ipset.Add(name, entry); err != nil {
+		return fmt.Errorf("add IP to ipset %s: %w", name, err)
+	}
+
+	return nil
+}
+
+func (m *aclManager) delFromIPSet(name string, ip net.IP) error {
+	cidr := uint8(32)
+	if ip.To4() == nil {
+		cidr = 128
+	}
+
+	entry := &ipset.Entry{
+		IP:   ip,
+		CIDR: cidr,
+	}
+
+	if err := ipset.Del(name, entry); err != nil {
+		return fmt.Errorf("delete IP from ipset %s: %w", name, err)
+	}
+
+	return nil
+}
+
+func (m *aclManager) flushIPSet(name string) error {
+	return ipset.Flush(name)
+}
+
+func (m *aclManager) destroyIPSet(name string) error {
+	return ipset.Destroy(name)
+}
diff --git a/client/firewall/iptables/router_linux.go b/client/firewall/iptables/router_linux.go
index 305b0bf28..1fe4c149f 100644
--- a/client/firewall/iptables/router_linux.go
+++ b/client/firewall/iptables/router_linux.go
@@ -10,7 +10,7 @@ import (
 
 	"github.com/coreos/go-iptables/iptables"
 	"github.com/hashicorp/go-multierror"
-	"github.com/nadoo/ipset"
+	ipset "github.com/lrh3321/ipset-go"
 	log "github.com/sirupsen/logrus"
 
 	nberrors "github.com/netbirdio/netbird/client/errors"
@@ -107,10 +107,6 @@ func newRouter(iptablesClient *iptables.IPTables, wgIface iFaceMapper, mtu uint1
 		},
 	)
 
-	if err := ipset.Init(); err != nil {
-		return nil, fmt.Errorf("init ipset: %w", err)
-	}
-
 	return r, nil
 }
 
@@ -232,12 +228,12 @@ func (r *router) findSets(rule []string) []string {
 }
 
 func (r *router) createIpSet(setName string, sources []netip.Prefix) error {
-	if err := ipset.Create(setName, ipset.OptTimeout(0)); err != nil {
+	if err := r.createIPSet(setName); err != nil {
 		return fmt.Errorf("create set %s: %w", setName, err)
 	}
 
 	for _, prefix := range sources {
-		if err := ipset.AddPrefix(setName, prefix); err != nil {
+		if err := r.addPrefixToIPSet(setName, prefix); err != nil {
 			return fmt.Errorf("add element to set %s: %w", setName, err)
 		}
 	}
@@ -246,7 +242,7 @@ func (r *router) createIpSet(setName string, sources []netip.Prefix) error {
 }
 
 func (r *router) deleteIpSet(setName string) error {
-	if err := ipset.Destroy(setName); err != nil {
+	if err := r.destroyIPSet(setName); err != nil {
 		return fmt.Errorf("destroy set %s: %w", setName, err)
 	}
 
@@ -915,8 +911,8 @@ func (r *router) UpdateSet(set firewall.Set, prefixes []netip.Prefix) error {
 			log.Tracef("skipping IPv6 prefix %s: IPv6 support not yet implemented", prefix)
 			continue
 		}
-		if err := ipset.AddPrefix(set.HashedName(), prefix); err != nil {
-			merr = multierror.Append(merr, fmt.Errorf("increment ipset counter: %w", err))
+		if err := r.addPrefixToIPSet(set.HashedName(), prefix); err != nil {
+			merr = multierror.Append(merr, fmt.Errorf("add prefix to ipset: %w", err))
 		}
 	}
 	if merr == nil {
@@ -993,3 +989,37 @@ func applyPort(flag string, port *firewall.Port) []string {
 
 	return []string{flag, strconv.Itoa(int(port.Values[0]))}
 }
+
+func (r *router) createIPSet(name string) error {
+	opts := ipset.CreateOptions{
+		Replace: true,
+	}
+
+	if err := ipset.Create(name, ipset.TypeHashNet, opts); err != nil {
+		return fmt.Errorf("create ipset %s: %w", name, err)
+	}
+
+	log.Debugf("created ipset %s with type hash:net", name)
+	return nil
+}
+
+func (r *router) addPrefixToIPSet(name string, prefix netip.Prefix) error {
+	addr := prefix.Addr()
+	ip := addr.AsSlice()
+
+	entry := &ipset.Entry{
+		IP:      ip,
+		CIDR:    uint8(prefix.Bits()),
+		Replace: true,
+	}
+
+	if err := ipset.Add(name, entry); err != nil {
+		return fmt.Errorf("add prefix to ipset %s: %w", name, err)
+	}
+
+	return nil
+}
+
+func (r *router) destroyIPSet(name string) error {
+	return ipset.Destroy(name)
+}
diff --git a/go.mod b/go.mod
index 14cd49192..2d7e0d31c 100644
--- a/go.mod
+++ b/go.mod
@@ -16,7 +16,7 @@ require (
 	github.com/sirupsen/logrus v1.9.3
 	github.com/spf13/cobra v1.7.0
 	github.com/spf13/pflag v1.0.5
-	github.com/vishvananda/netlink v1.3.0
+	github.com/vishvananda/netlink v1.3.1
 	golang.org/x/crypto v0.40.0
 	golang.org/x/sys v0.34.0
 	golang.zx2c4.com/wireguard v0.0.0-20230704135630-469159ecf7d1
@@ -59,10 +59,10 @@ require (
 	github.com/jackc/pgx/v5 v5.5.5
 	github.com/libdns/route53 v1.5.0
 	github.com/libp2p/go-netroute v0.2.1
+	github.com/lrh3321/ipset-go v0.0.0-20250619021614-54a0a98ace81
 	github.com/mdlayher/socket v0.5.1
 	github.com/miekg/dns v1.1.59
 	github.com/mitchellh/hashstructure/v2 v2.0.2
-	github.com/nadoo/ipset v0.5.0
 	github.com/netbirdio/management-integrations/integrations v0.0.0-20251027212525-d751b79f5d48
 	github.com/netbirdio/signal-dispatcher/dispatcher v0.0.0-20250805121659-6b4ac470ca45
 	github.com/okta/okta-sdk-golang/v2 v2.18.0
@@ -236,7 +236,7 @@ require (
 	github.com/stretchr/objx v0.5.2 // indirect
 	github.com/tklauser/go-sysconf v0.3.14 // indirect
 	github.com/tklauser/numcpus v0.8.0 // indirect
-	github.com/vishvananda/netns v0.0.4 // indirect
+	github.com/vishvananda/netns v0.0.5 // indirect
 	github.com/vmihailenco/tagparser/v2 v2.0.0 // indirect
 	github.com/wlynxg/anet v0.0.3 // indirect
 	github.com/yuin/goldmark v1.7.8 // indirect
diff --git a/go.sum b/go.sum
index ee5027d61..f4b62dff0 100644
--- a/go.sum
+++ b/go.sum
@@ -316,6 +316,8 @@ github.com/libdns/libdns v0.2.2 h1:O6ws7bAfRPaBsgAYt8MDe2HcNBGC29hkZ9MX2eUSX3s=
 github.com/libdns/libdns v0.2.2/go.mod h1:4Bj9+5CQiNMVGf87wjX4CY3HQJypUHRuLvlsfsZqLWQ=
 github.com/libdns/route53 v1.5.0 h1:2SKdpPFl/qgWsXQvsLNJJAoX7rSxlk7zgoL4jnWdXVA=
 github.com/libdns/route53 v1.5.0/go.mod h1:joT4hKmaTNKHEwb7GmZ65eoDz1whTu7KKYPS8ZqIh6Q=
+github.com/lrh3321/ipset-go v0.0.0-20250619021614-54a0a98ace81 h1:J56rFEfUTFT9j9CiRXhi1r8lUJ4W5idG3CiaBZGojNU=
+github.com/lrh3321/ipset-go v0.0.0-20250619021614-54a0a98ace81/go.mod h1:RD8ML/YdXctQ7qbcizZkw5mZ6l8Ogrl1dodBzVJduwI=
 github.com/lufia/plan9stats v0.0.0-20211012122336-39d0f177ccd0/go.mod h1:zJYVVT2jmtg6P3p1VtQj7WsuWi/y4VnjVBn7F8KPB3I=
 github.com/lufia/plan9stats v0.0.0-20240513124658-fba389f38bae h1:dIZY4ULFcto4tAFlj1FYZl8ztUZ13bdq+PLY+NOfbyI=
 github.com/lufia/plan9stats v0.0.0-20240513124658-fba389f38bae/go.mod h1:ilwx/Dta8jXAgpFYFvSWEMwxmbWXyiUHkd5FwyKhb5k=
@@ -356,8 +358,6 @@ github.com/morikuni/aec v1.0.0 h1:nP9CBfwrvYnBRgY6qfDQkygYDmYwOilePFkwzv4dU8A=
 github.com/morikuni/aec v1.0.0/go.mod h1:BbKIizmSmc5MMPqRYbxO4ZU0S0+P200+tUnFx7PXmsc=
 github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 h1:C3w9PqII01/Oq1c1nUAm88MOHcQC9l5mIlSMApZMrHA=
 github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822/go.mod h1:+n7T8mK8HuQTcFwEeznm/DIxMOiR9yIdICNftLE1DvQ=
-github.com/nadoo/ipset v0.5.0 h1:5GJUAuZ7ITQQQGne5J96AmFjRtI8Avlbk6CabzYWVUc=
-github.com/nadoo/ipset v0.5.0/go.mod h1:rYF5DQLRGGoQ8ZSWeK+6eX5amAuPqwFkWjhQlEITGJQ=
 github.com/netbirdio/go-netroute v0.0.0-20240611143515-f59b0e1d3944 h1:TDtJKmM6Sf8uYFx/dMeqNOL90KUoRscdfpFZ3Im89uk=
 github.com/netbirdio/go-netroute v0.0.0-20240611143515-f59b0e1d3944/go.mod h1:sHA6TRxjQ6RLbnI+3R4DZo2Eseg/iKiPRfNmcuNySVQ=
 github.com/netbirdio/ice/v4 v4.0.0-20250908184934-6202be846b51 h1:Ov4qdafATOgGMB1wbSuh+0aAHcwz9hdvB6VZjh1mVMI=
@@ -519,10 +519,10 @@ github.com/tklauser/numcpus v0.8.0 h1:Mx4Wwe/FjZLeQsK/6kt2EOepwwSl7SmJrK5bV/dXYg
 github.com/tklauser/numcpus v0.8.0/go.mod h1:ZJZlAY+dmR4eut8epnzf0u/VwodKmryxR8txiloSqBE=
 github.com/ugorji/go v1.1.7/go.mod h1:kZn38zHttfInRq0xu/PH0az30d+z6vm202qpg1oXVMw=
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