rebase

cmd/signal.go

@@ -6,7 +6,7 @@ import (
 	log "github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
 	sig "github.com/wiretrustee/wiretrustee/signal"
-	sProto "github.com/wiretrustee/wiretrustee/signal/proto"
+	sigProto "github.com/wiretrustee/wiretrustee/signal/proto"
 	"google.golang.org/grpc"
 	"net"
 )
@@ -30,7 +30,7 @@ var (
 			}
 			var opts []grpc.ServerOption
 			grpcServer := grpc.NewServer(opts...)
-			sProto.RegisterSignalExchangeServer(grpcServer, sig.NewServer())
+			sigProto.RegisterSignalExchangeServer(grpcServer, sig.NewServer())
 			log.Printf("started server: localhost:%v", port)
 			if err := grpcServer.Serve(lis); err != nil {
 				log.Fatalf("failed to serve: %v", err)

connection/connection.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	ice "github.com/pion/ice/v2"
 	log "github.com/sirupsen/logrus"
+	"github.com/wiretrustee/wiretrustee/iface"
 	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
 	"sync"
 	"time"
@@ -93,6 +94,7 @@ func (conn *Connection) Open(timeout time.Duration) error {
 
 	// create an ice.Agent that will be responsible for negotiating and establishing actual peer-to-peer connection
 	a, err := ice.NewAgent(&ice.AgentConfig{
+		// MulticastDNSMode: ice.MulticastDNSModeQueryAndGather,
 		NetworkTypes: []ice.NetworkType{ice.NetworkTypeUDP4},
 		Urls:         conn.Config.StunTurnURLS,
 		InterfaceFilter: func(s string) bool {
@@ -144,10 +146,23 @@ func (conn *Connection) Open(timeout time.Duration) error {
 			return err
 		}
 
-		err = conn.wgProxy.Start(remoteConn)
+		pair, err := conn.agent.GetSelectedCandidatePair()
 		if err != nil {
 			return err
 		}
+		// in case the remote peer is in the local network we don't need a Wireguard proxy, direct communication is possible.
+		if pair.Local.Type() == ice.CandidateTypeHost && pair.Remote.Type() == ice.CandidateTypeHost {
+			log.Debugf("remote peer %s is in the local network with an address %s", conn.Config.RemoteWgKey.String(), pair.Remote.Address())
+			err = conn.wgProxy.StartLocal(fmt.Sprintf("%s:%d", pair.Remote.Address(), iface.WgPort))
+			if err != nil {
+				return err
+			}
+		} else {
+			err = conn.wgProxy.Start(remoteConn)
+			if err != nil {
+				return err
+			}
+		}
 
 		log.Infof("opened connection to peer %s", conn.Config.RemoteWgKey.String())
 	case <-time.After(timeout):
@@ -298,7 +313,6 @@ func (conn *Connection) listenOnConnectionStateChanges() error {
 			}
 			log.Infof("will connect to peer %s via a selected connnection candidate pair %s", conn.Config.RemoteWgKey.String(), pair)
 		} else if state == ice.ConnectionStateDisconnected || state == ice.ConnectionStateFailed {
-			// todo do we really wanna have a connection restart within connection itself? Think of moving it outside
 			err := conn.Close()
 			if err != nil {
 				log.Warnf("error while closing connection to peer %s -> %s", conn.Config.RemoteWgKey.String(), err.Error())

connection/wgproxy.go

@@ -42,6 +42,15 @@ func (p *WgProxy) Close() error {
 	return nil
 }
 
+func (p *WgProxy) StartLocal(host string) error {
+	err := iface.UpdatePeer(p.iface, p.remoteKey, p.allowedIps, DefaultWgKeepAlive, host)
+	if err != nil {
+		log.Errorf("error while configuring Wireguard peer [%s] %s", p.remoteKey, err.Error())
+		return err
+	}
+	return nil
+}
+
 // Start starts a new proxy using the ICE connection
 func (p *WgProxy) Start(remoteConn *ice.Conn) error {
 

go.mod

@@ -4,13 +4,17 @@ go 1.16
 
 require (
 	github.com/cenkalti/backoff/v4 v4.1.0
-	github.com/golang/protobuf v1.4.3
+	github.com/golang/protobuf v1.5.2
-	github.com/kardianos/service v1.2.0
+	github.com/google/nftables v0.0.0-20201230142148-715e31cb3c31
+	github.com/onsi/ginkgo v1.16.4
+	github.com/onsi/gomega v1.13.0
 	github.com/pion/ice/v2 v2.1.7
 	github.com/sirupsen/logrus v1.7.0
 	github.com/spf13/cobra v1.1.3
 	github.com/vishvananda/netlink v1.1.0
+	github.com/vishvananda/netns v0.0.0-20191106174202-0a2b9b5464df
 	golang.org/x/crypto v0.0.0-20210506145944-38f3c27a63bf
+	golang.org/x/sys v0.0.0-20210510120138-977fb7262007
 	golang.zx2c4.com/wireguard v0.0.0-20210604143328-f9b48a961cd2
 	golang.zx2c4.com/wireguard/wgctrl v0.0.0-20210506160403-92e472f520a5
 	golang.zx2c4.com/wireguard/windows v0.3.14

go.sum

@@ -45,12 +45,15 @@ github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1m
 github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
 github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
+github.com/fsnotify/fsnotify v1.4.9 h1:hsms1Qyu0jgnwNXIxa+/V/PDsU6CfLf6CNO8H7IWoS4=
+github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4IgpuI1SZQ=
 github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
 github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU=
 github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
 github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9GBnD5lWE=
 github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V4qmtdjCk=
 github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
+github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0/go.mod h1:fyg7847qk6SyHyPtNmDHnmrv/HOrqktSC+C9fM+CJOE=
 github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
 github.com/gogo/protobuf v1.2.1/go.mod h1:hp+jE20tsWTFYpLwKvXlhS1hjn+gTNwPg2I6zVXpSg4=
 github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
@@ -67,8 +70,10 @@ github.com/golang/protobuf v1.4.0-rc.1.0.20200221234624-67d41d38c208/go.mod h1:x
 github.com/golang/protobuf v1.4.0-rc.2/go.mod h1:LlEzMj4AhA7rCAGe4KMBDvJI+AwstrUpVNzEA03Pprs=
 github.com/golang/protobuf v1.4.0-rc.4.0.20200313231945-b860323f09d0/go.mod h1:WU3c8KckQ9AFe+yFwt9sWVRKCVIyN9cPHBJSNnbL67w=
 github.com/golang/protobuf v1.4.0/go.mod h1:jodUvKwWbYaEsadDk5Fwe5c77LiNKVO9IDvqG2KuDX0=
-github.com/golang/protobuf v1.4.3 h1:JjCZWpVbqXDqFVmTfYWEVTMIYrL/NPdPSCHPJ0T/raM=
+github.com/golang/protobuf v1.4.2/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI=
-github.com/golang/protobuf v1.4.3/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI=
+github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
+github.com/golang/protobuf v1.5.2 h1:ROPKBNFfQgOUMifHyP+KYbvpjbdoFNs+aK7DXlji0Tw=
+github.com/golang/protobuf v1.5.2/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
 github.com/google/btree v0.0.0-20180813153112-4030bb1f1f0c/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
 github.com/google/btree v1.0.0/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
 github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
@@ -80,6 +85,8 @@ github.com/google/go-cmp v0.5.4/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/
 github.com/google/go-cmp v0.5.5 h1:Khx7svrCpmxxtHBq5j2mp/xVjsi8hQMfNLvJFAlrGgU=
 github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/martian v2.1.0+incompatible/go.mod h1:9I4somxYTbIHy5NJKHRl3wXiIaQGbYVAs8BPL6v8lEs=
+github.com/google/nftables v0.0.0-20201230142148-715e31cb3c31 h1:kyEB9geFhgDyawmvavtNu9iGW9ri/iq54XTSNIEeHxI=
+github.com/google/nftables v0.0.0-20201230142148-715e31cb3c31/go.mod h1:cfspEyr/Ap+JDIITA+N9a0ernqG0qZ4W1aqMRgDZa1g=
 github.com/google/pprof v0.0.0-20181206194817-3ea8567a2e57/go.mod h1:zfwlbNMJ+OItoe0UupaVj+oy1omPYYDuagoSzA8v9mc=
 github.com/google/pprof v0.0.0-20190515194954-54271f7e092f/go.mod h1:zfwlbNMJ+OItoe0UupaVj+oy1omPYYDuagoSzA8v9mc=
 github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm40UhjYkI=
@@ -112,6 +119,7 @@ github.com/hashicorp/logutils v1.0.0/go.mod h1:QIAnNjmIWmVIIkWDTG1z5v++HQmx9WQRO
 github.com/hashicorp/mdns v1.0.0/go.mod h1:tL+uN++7HEJ6SQLQ2/p+z2pH24WQKWjBPkE0mNTz8vQ=
 github.com/hashicorp/memberlist v0.1.3/go.mod h1:ajVTdAv/9Im8oMAAj5G31PhhMCZJV2pPBoIllUwCN7I=
 github.com/hashicorp/serf v0.8.2/go.mod h1:6hOLApaqBFA1NXqRQAsxw9QxuDEvNxSQRwA/JwenrHc=
+github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
 github.com/inconshreveable/mousetrap v1.0.0 h1:Z8tu5sraLXCXIcARxBp/8cbvlwVa7Z1NHg9XEKhtSvM=
 github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
 github.com/jonboulle/clockwork v0.1.0/go.mod h1:Ii8DK3G1RaLaWxj9trq07+26W01tbo22gdxWY5EU2bo=
@@ -129,14 +137,16 @@ github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCV
 github.com/jstemmer/go-junit-report v0.0.0-20190106144839-af01ea7f8024/go.mod h1:6v2b51hI/fHJwM22ozAgKL4VKDeJcHhJFhtBdhmNjmU=
 github.com/jtolds/gls v4.20.0+incompatible/go.mod h1:QJZ7F/aHp+rZTRtaJ1ow/lLfFfVYBRgL+9YlvaHOwJU=
 github.com/julienschmidt/httprouter v1.2.0/go.mod h1:SYymIcj16QtmaHHD7aYtjjsJG7VTCxuUUipMqKk8s4w=
-github.com/kardianos/service v1.2.0 h1:bGuZ/epo3vrt8IPC7mnKQolqFeYJb7Cs8Rk4PSOBB/g=
-github.com/kardianos/service v1.2.0/go.mod h1:CIMRFEJVL+0DS1a3Nx06NaMn4Dz63Ng6O7dl0qH0zVM=
 github.com/kisielk/errcheck v1.1.0/go.mod h1:EZBBE59ingxPouuu3KfxchcWSUPOHkagtvWXihfKN4Q=
 github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
+github.com/koneu/natend v0.0.0-20150829182554-ec0926ea948d h1:MFX8DxRnKMY/2M3H61iSsVbo/n3h0MWGmWNN1UViOU0=
+github.com/koneu/natend v0.0.0-20150829182554-ec0926ea948d/go.mod h1:QHb4k4cr1fQikUahfcRVPcEXiUgFsdIstGqlurL0XL4=
 github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
 github.com/kr/logfmt v0.0.0-20140226030751-b84e30acd515/go.mod h1:+0opPa2QZZtGFBFZlji/RkVcI2GknAs/DXo4wKdlNEc=
+github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
+github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/lxn/walk v0.0.0-20210112085537-c389da54e794/go.mod h1:E23UucZGqpuUANJooIbHWCufXvOcT6E7Stq81gU+CSQ=
 github.com/lxn/win v0.0.0-20210218163916-a377121e959e/go.mod h1:KxxjdtRkfNoYDCUP5ryK7XJJNTnpC8atvtmTheChOtk=
@@ -149,6 +159,7 @@ github.com/mdlayher/ethtool v0.0.0-20210210192532-2b88debcdd43/go.mod h1:+t7E0lk
 github.com/mdlayher/genetlink v1.0.0 h1:OoHN1OdyEIkScEmRgxLEe2M9U8ClMytqA5niynLtfj0=
 github.com/mdlayher/genetlink v1.0.0/go.mod h1:0rJ0h4itni50A86M2kHcgS85ttZazNt7a8H2a2cw0Gc=
 github.com/mdlayher/netlink v0.0.0-20190409211403-11939a169225/go.mod h1:eQB3mZE4aiYnlUsyGGCOpPETfdQq4Jhsgf1fk3cwQaA=
+github.com/mdlayher/netlink v0.0.0-20191009155606-de872b0d824b/go.mod h1:KxeJAFOFLG6AjpyDkQ/iIhxygIUKD+vcwqcnu43w/+M=
 github.com/mdlayher/netlink v1.0.0/go.mod h1:KxeJAFOFLG6AjpyDkQ/iIhxygIUKD+vcwqcnu43w/+M=
 github.com/mdlayher/netlink v1.1.0/go.mod h1:H4WCitaheIsdF9yOYu8CFmCgQthAPIWZmcKp9uZHgmY=
 github.com/mdlayher/netlink v1.1.1/go.mod h1:WTYpFb/WTvlRJAyKhZL5/uy69TDDpHHu2VZmb2XgV7o=
@@ -172,7 +183,19 @@ github.com/mitchellh/mapstructure v1.1.2/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh
 github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
 github.com/modern-go/reflect2 v1.0.1/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
 github.com/mwitkow/go-conntrack v0.0.0-20161129095857-cc309e4a2223/go.mod h1:qRWi+5nqEBWmkhHvq77mSJWrCKwh8bxhgT7d/eI7P4U=
+github.com/nxadm/tail v1.4.4/go.mod h1:kenIhsEOeOJmVchQTgglprH7qJGnHDVpk1VPCcaMI8A=
+github.com/nxadm/tail v1.4.8 h1:nPr65rt6Y5JFSKQO7qToXr7pePgD6Gwiw05lkbyAQTE=
+github.com/nxadm/tail v1.4.8/go.mod h1:+ncqLTQzXmGhMZNUePPaPqPvBxHAIsmXswZKocGu+AU=
 github.com/oklog/ulid v1.3.1/go.mod h1:CirwcVhetQ6Lv90oh/F+FBtV6XMibvdAFo93nm5qn4U=
+github.com/onsi/ginkgo v1.6.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
+github.com/onsi/ginkgo v1.12.1/go.mod h1:zj2OWP4+oCPe1qIXoGWkgMRwljMUYCdkwsT2108oapk=
+github.com/onsi/ginkgo v1.16.2/go.mod h1:CObGmKUOKaSC0RjmoAK7tKyn4Azo5P2IWuoMnvwxz1E=
+github.com/onsi/ginkgo v1.16.4 h1:29JGrr5oVBm5ulCWet69zQkzWipVXIol6ygQUe/EzNc=
+github.com/onsi/ginkgo v1.16.4/go.mod h1:dX+/inL/fNMqNlz0e9LfyB9TswhZpCVdJM/Z6Vvnwo0=
+github.com/onsi/gomega v1.7.1/go.mod h1:XdKZgCCFLUoM/7CFJVPcG8C1xQ1AJ0vpAezJrB7JYyY=
+github.com/onsi/gomega v1.10.1/go.mod h1:iN09h71vgCQne3DLsj+A5owkum+a2tYe+TOCB1ybHNo=
+github.com/onsi/gomega v1.13.0 h1:7lLHu94wT9Ij0o6EWWclhu0aOh32VxhkwEJvzuWPeak=
+github.com/onsi/gomega v1.13.0/go.mod h1:lRk9szgn8TxENtWd0Tp4c3wjlRfMTMH27I+3Je41yGY=
 github.com/pascaldekloe/goe v0.0.0-20180627143212-57f6aae5913c/go.mod h1:lzWF7FIEvWOWxwDKqyGYQf6ZUaNfKdP144TG7ZOy1lc=
 github.com/pelletier/go-toml v1.2.0/go.mod h1:5z9KED0ma1S8pY6P1sdut58dfprrGBbd/94hg7ilaic=
 github.com/pion/dtls/v2 v2.0.9 h1:7Ow+V++YSZQMYzggI0P9vLJz/hUFcffsfGMfT/Qy+u8=
@@ -197,6 +220,8 @@ github.com/pion/udp v0.1.1 h1:8UAPvyqmsxK8oOjloDk4wUt63TzFe9WEJkg5lChlj7o=
 github.com/pion/udp v0.1.1/go.mod h1:6AFo+CMdKQm7UiA0eUPA8/eVCTx8jBIITLZHc9DWX5M=
 github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
+github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/posener/complete v1.1.1/go.mod h1:em0nMJCgc9GFtwrmVmEMR/ZL6WyhyjMBndrE9hABlRI=
@@ -236,6 +261,7 @@ github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+
 github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
 github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
@@ -243,9 +269,11 @@ github.com/subosito/gotenv v1.2.0/go.mod h1:N0PQaV/YGNqwC0u51sEeR/aUtSLEXKX9iv69
 github.com/tmc/grpc-websocket-proxy v0.0.0-20190109142713-0ad062ec5ee5/go.mod h1:ncp9v5uamzpCO7NfCPTXjqaC+bZgJeR0sMTm6dMHP7U=
 github.com/vishvananda/netlink v1.1.0 h1:1iyaYNBLmP6L0220aDnYQpo1QEV4t4hJ+xEEhhJH8j0=
 github.com/vishvananda/netlink v1.1.0/go.mod h1:cTgwzPIzzgDAYoQrMm0EdrjRUBkTqKYppBueQtXaqoE=
+github.com/vishvananda/netns v0.0.0-20180720170159-13995c7128cc/go.mod h1:ZjcWmFBXmLKZu9Nxj3WKYEafiSqer2rnvPr0en9UNpI=
 github.com/vishvananda/netns v0.0.0-20191106174202-0a2b9b5464df h1:OviZH7qLw/7ZovXvuNyL3XQl8UFofeikI1NW1Gypu7k=
 github.com/vishvananda/netns v0.0.0-20191106174202-0a2b9b5464df/go.mod h1:JP3t17pCcGlemwknint6hfoeCVQrEMVwxRLRjXpq+BU=
 github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2/go.mod h1:UETIi67q53MR2AWcXfiuqkDkRtnGDLqkBTpCHuJHxtU=
+github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 go.etcd.io/bbolt v1.3.2/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
 go.opencensus.io v0.21.0/go.mod h1:mSImk1erAIZhrmZN+AvHh14ztQfjbGwt4TtuofqLduU=
 go.opencensus.io v0.22.0/go.mod h1:+kGneAE2xo2IficOXnaByMWTGM9T73dGwxeWcUqIpI8=
@@ -257,6 +285,7 @@ golang.org/x/crypto v0.0.0-20181029021203-45a5f77698d3/go.mod h1:6SG95UA2DQfeDnf
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/crypto v0.0.0-20210220033148-5ea612d1eb83/go.mod h1:jdWPYTVW3xRLrWPugEBEK3UY2ZEsg3UU495nc5E+M+I=
 golang.org/x/crypto v0.0.0-20210322153248-0c34fe9e7dc2/go.mod h1:T9bdIzuCu7OtxOm1hfPfRQxPLYneinmdGuTeoZ9dtd4=
@@ -281,8 +310,10 @@ golang.org/x/mobile v0.0.0-20190312151609-d3739f865fa6/go.mod h1:z+o9i4GpDbdi3rU
 golang.org/x/mobile v0.0.0-20190719004257-d2bd2a29d028/go.mod h1:E/iHnbuqvinMTCcRqshq8CkpyQDoeVncDDYHnLhea+o=
 golang.org/x/mod v0.0.0-20190513183733-4bf6d317e70e/go.mod h1:mXi4GBBbnImb6dmsKGUJ2LatrhH/nqhxcFungHvyanc=
 golang.org/x/mod v0.1.0/go.mod h1:0QHyrYULN0/3qlju5TqG8bIK38QM8yzMo5ekMj3DlcY=
+golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
+golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20181023162649-9b4f9f5ad519/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20181114220301-adae6a3d119a/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20181201002055-351d144fa1fc/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
@@ -297,9 +328,12 @@ golang.org/x/net v0.0.0-20190603091049-60506f45cf65/go.mod h1:HSz+uSET+XFnRR8LxR
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20190827160401-ba9fcec4b297/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20191007182048-72f939374954/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20191028085509-fe3aa8a45271/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20200202094626-16171245cfb2/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20200520004742-59133d7f0dd7/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A=
 golang.org/x/net v0.0.0-20200625001655-4c5254603344/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
 golang.org/x/net v0.0.0-20201010224723-4f7140c49acb/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
+golang.org/x/net v0.0.0-20201021035429-f5854403a974/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
 golang.org/x/net v0.0.0-20201110031124-69a78807bb2b/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
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@@ -307,6 +341,7 @@ golang.org/x/net v0.0.0-20201224014010-6772e930b67b/go.mod h1:m0MpNAwzfU5UDzcl9v
 golang.org/x/net v0.0.0-20210119194325-5f4716e94777/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
 golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
 golang.org/x/net v0.0.0-20210331212208-0fccb6fa2b5c/go.mod h1:p54w0d4576C0XHj96bSt6lcn1PtDYWL6XObtHCRCNQM=
+golang.org/x/net v0.0.0-20210428140749-89ef3d95e781/go.mod h1:OJAsFXCWl8Ukc7SiCT/9KSuxbyM7479/AVlXFRxuMCk=
 golang.org/x/net v0.0.0-20210504132125-bbd867fde50d/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/net v0.0.0-20210510120150-4163338589ed h1:p9UgmWI9wKpfYmgaV/IZKGdXc5qEK45tDwwwDyjS26I=
 golang.org/x/net v0.0.0-20210510120150-4163338589ed/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
@@ -318,13 +353,16 @@ golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190227155943-e225da77a7e6/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20180823144017-11551d06cbcc/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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 golang.org/x/sys v0.0.0-20190312061237-fead79001313/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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@@ -334,18 +372,22 @@ golang.org/x/sys v0.0.0-20190606165138-5da285871e9c/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20190606203320-7fc4e5ec1444/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190624142023-c5567b49c5d0/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190826190057-c7b8b68b1456/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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@@ -385,7 +427,10 @@ golang.org/x/tools v0.0.0-20190816200558-6889da9d5479/go.mod h1:b+2E5dAYhXwXZwtn
 golang.org/x/tools v0.0.0-20190911174233-4f2ddba30aff/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
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 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
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@@ -428,18 +473,27 @@ google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ
 google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
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 google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
-google.golang.org/protobuf v1.23.0 h1:4MY060fB1DLGMB/7MBTLnwQUY6+F09GEiz6SsrNqyzM=
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+google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
+google.golang.org/protobuf v1.26.0 h1:bxAC2xTBsZGibn2RTntX0oH50xLsqy1OxA9tTL3p/lk=
+google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
+gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
 gopkg.in/ini.v1 v1.51.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
 gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

iface/iface.go

@@ -1,32 +1,25 @@
 package iface
 
 import (
-	"net"
-	"time"
-
 	log "github.com/sirupsen/logrus"
 	"golang.zx2c4.com/wireguard/conn"
 	"golang.zx2c4.com/wireguard/device"
 	"golang.zx2c4.com/wireguard/tun"
 	"golang.zx2c4.com/wireguard/wgctrl"
 	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
+	"net"
+	"time"
 )
 
 const (
 	defaultMTU = 1280
+	WgPort     = 51820
 )
 
-// Saves tun device object - is it required?
 var tunIface tun.Device
 
-// Delete deletes an existing Wireguard interface
+// CreateWithUserspace Creates a new Wireguard interface, using wireguard-go userspace implementation
-func Delete() error {
+func CreateWithUserspace(iface string, address string) error {
-	return tunIface.Close()
-}
-
-// Create Creates a new Wireguard interface, sets a given IP and brings it up.
-// Will reuse an existing one.
-func Create(iface string, address string) error {
 	var err error
 	tunIface, err = tun.CreateTUN(iface, defaultMTU)
 	if err != nil {
@@ -57,7 +50,7 @@ func Create(iface string, address string) error {
 
 	log.Debugln("UAPI listener started")
 
-	err = assignAddr(address, tunIface)
+	err = assignAddr(address, iface)
 	if err != nil {
 		return err
 	}
@@ -90,10 +83,12 @@ func Configure(iface string, privateKey string) error {
 		return err
 	}
 	fwmark := 0
+	p := WgPort
 	cfg := wgtypes.Config{
 		PrivateKey:   &key,
 		ReplacePeers: false,
 		FirewallMark: &fwmark,
+		ListenPort:   &p,
 	}
 	err = wg.ConfigureDevice(iface, cfg)
 	if err != nil {

iface/iface_darwin.go

@@ -2,19 +2,18 @@ package iface
 
 import (
 	log "github.com/sirupsen/logrus"
-	"golang.zx2c4.com/wireguard/tun"
 	"net"
 	"os/exec"
 	"strings"
 )
 
-//const (
+// Create Creates a new Wireguard interface, sets a given IP and brings it up.
-//	interfacePrefix = "utun"
+func Create(iface string, address string) error {
-//)
+	return CreateWithUserspace(iface, address)
+}
 
 // assignAddr Adds IP address to the tunnel interface and network route based on the range provided
-func assignAddr(address string, tunDevice tun.Device) error {
+func assignAddr(address string, ifaceName string) error {
-	ifaceName, err := tunDevice.Name()
 	ip := strings.Split(address, "/")
 	cmd := exec.Command("ifconfig", ifaceName, "inet", address, ip[0])
 	if out, err := cmd.CombinedOutput(); err != nil {

iface/iface_linux.go

@@ -3,24 +3,76 @@ package iface
 import (
 	log "github.com/sirupsen/logrus"
 	"github.com/vishvananda/netlink"
-	"golang.zx2c4.com/wireguard/tun"
-
 	"os"
 )
 
-//const (
+// Create Creates a new Wireguard interface, sets a given IP and brings it up.
-//	interfacePrefix = "wg"
+// Will reuse an existing one.
-//)
+func Create(iface string, address string) error {
 
-// assignAddr Adds IP address to the tunnel interface
+	if WireguardModExists() {
-func assignAddr(address string, tunDevice tun.Device) error {
+		log.Debug("using kernel Wireguard module")
-	var err error
+		return CreateWithKernel(iface, address)
+	} else {
+		return CreateWithUserspace(iface, address)
+	}
+}
+
+// CreateWithKernel Creates a new Wireguard interface using kernel Wireguard module.
+// Works for Linux and offers much better network performance
+func CreateWithKernel(iface string, address string) error {
 	attrs := netlink.NewLinkAttrs()
-	attrs.Name, err = tunDevice.Name()
+	attrs.Name = iface
+
+	link := wgLink{
+		attrs: &attrs,
+	}
+
+	log.Debugf("adding device: %s", iface)
+	err := netlink.LinkAdd(&link)
+	if os.IsExist(err) {
+		log.Infof("interface %s already exists. Will reuse.", iface)
+	} else if err != nil {
+		return err
+	}
+
+	log.Debugf("adding address %s to interface: %s", address, iface)
+	addr, _ := netlink.ParseAddr(address)
+	err = netlink.AddrAdd(&link, addr)
+	if os.IsExist(err) {
+		log.Infof("interface %s already has the address: %s", iface, address)
+	} else if err != nil {
+		return err
+	}
+	err = assignAddr(address, iface)
 	if err != nil {
 		return err
 	}
 
+	// todo do a discovery
+	log.Debugf("setting MTU: %s", iface)
+	err = netlink.LinkSetMTU(&link, defaultMTU)
+	if err != nil {
+		log.Errorf("error setting MTU on interface: %s", iface)
+		return err
+	}
+
+	log.Debugf("bringing up interface: %s", iface)
+	err = netlink.LinkSetUp(&link)
+	if err != nil {
+		log.Errorf("error bringing up interface: %s", iface)
+		return err
+	}
+
+	return nil
+}
+
+// assignAddr Adds IP address to the tunnel interface
+func assignAddr(address, name string) error {
+	var err error
+	attrs := netlink.NewLinkAttrs()
+	attrs.Name = name
+
 	link := wgLink{
 		attrs: &attrs,
 	}

iface/iface_windows.go

@@ -8,16 +8,21 @@ import (
 	"net"
 )
 
+// Create Creates a new Wireguard interface, sets a given IP and brings it up.
+func Create(iface string, address string) error {
+	return CreateWithUserspace(iface, address)
+}
+
 // assignAddr Adds IP address to the tunnel interface and network route based on the range provided
-func assignAddr(address string, tunDevice tun.Device) error {
+func assignAddr(address string, ifaceName string) error {
-	ifaceName, err := tunDevice.Name()
+
-	nativeTunDevice := tunDevice.(*tun.NativeTun)
+	nativeTunDevice := tunIface.(*tun.NativeTun)
 	luid := winipcfg.LUID(nativeTunDevice.LUID())
 
 	ip, ipnet, _ := net.ParseCIDR(address)
 
 	log.Debugf("adding address %s to interface: %s", address, ifaceName)
-	err = luid.SetIPAddresses([]net.IPNet{{ip, ipnet.Mask}})
+	err := luid.SetIPAddresses([]net.IPNet{{ip, ipnet.Mask}})
 	if err != nil {
 		return err
 	}

iface/mod.go

@@ -0,0 +1,144 @@
+// +build linux
+
+package iface
+
+// Holds logic to check existence of Wireguard kernel module
+// Copied from https://github.com/paultag/go-modprobe
+
+import (
+	"debug/elf"
+	"fmt"
+	"golang.org/x/sys/unix"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+var (
+	// get the root directory for the kernel modules. If this line panics,
+	// it's because getModuleRoot has failed to get the uname of the running
+	// kernel (likely a non-POSIX system, but maybe a broken kernel?)
+	moduleRoot = getModuleRoot()
+)
+
+// Get the module root (/lib/modules/$(uname -r)/)
+func getModuleRoot() string {
+	uname := unix.Utsname{}
+	if err := unix.Uname(&uname); err != nil {
+		panic(err)
+	}
+
+	i := 0
+	for ; uname.Release[i] != 0; i++ {
+	}
+
+	return filepath.Join(
+		"/lib/modules",
+		string(uname.Release[:i]),
+	)
+}
+
+// modName will, given a file descriptor to a Kernel Module (.ko file), parse the
+// binary to get the module name. For instance, given a handle to the file at
+// `kernel/drivers/usb/gadget/legacy/g_ether.ko`, return `g_ether`.
+func modName(file *os.File) (string, error) {
+	f, err := elf.NewFile(file)
+	if err != nil {
+		return "", err
+	}
+
+	syms, err := f.Symbols()
+	if err != nil {
+		return "", err
+	}
+
+	for _, sym := range syms {
+		if strings.Compare(sym.Name, "__this_module") == 0 {
+			section := f.Sections[sym.Section]
+			data, err := section.Data()
+			if err != nil {
+				return "", err
+			}
+
+			if len(data) < 25 {
+				return "", fmt.Errorf("modprobe: data is short, __this_module is '%s'", data)
+			}
+
+			data = data[24:]
+			i := 0
+			for ; data[i] != 0x00; i++ {
+			}
+			return string(data[:i]), nil
+		}
+	}
+
+	return "", fmt.Errorf("No name found. Is this a .ko or just an ELF?")
+}
+
+// Open every single kernel module under the root, and parse the ELF headers to
+// extract the module name.
+func elfMap(root string) (map[string]string, error) {
+	ret := map[string]string{}
+
+	err := filepath.Walk(
+		root,
+		func(path string, info os.FileInfo, err error) error {
+
+			if err != nil {
+				// skip broken files
+				return nil
+			}
+
+			if !info.Mode().IsRegular() {
+				return nil
+			}
+			fd, err := os.Open(path)
+			if err != nil {
+				return err
+			}
+			defer fd.Close()
+			name, err := modName(fd)
+			if err != nil {
+				/* For now, let's just ignore that and avoid adding to it */
+				return nil
+			}
+
+			ret[name] = path
+			return nil
+		})
+
+	if err != nil {
+		return nil, err
+	}
+
+	return ret, nil
+}
+
+// Open every single kernel module under the kernel module directory
+// (/lib/modules/$(uname -r)/), and parse the ELF headers to extract the
+// module name.
+func generateMap() (map[string]string, error) {
+	return elfMap(moduleRoot)
+}
+
+// WireguardModExists returns true if Wireguard kernel module exists.
+func WireguardModExists() bool {
+	_, err := resolveModName("wireguard")
+	return err == nil
+}
+
+// resolveModName will, given a module name (such as `wireguard`) return an absolute
+// path to the .ko that provides that module.
+func resolveModName(name string) (string, error) {
+	paths, err := generateMap()
+	if err != nil {
+		return "", err
+	}
+
+	fsPath := paths[name]
+	if !strings.HasPrefix(fsPath, moduleRoot) {
+		return "", fmt.Errorf("module isn't in the module directory")
+	}
+
+	return fsPath, nil
+}

signal/client.go

@@ -29,7 +29,7 @@ type Client struct {
 	ctx        context.Context
 	stream     proto.SignalExchange_ConnectStreamClient
 	//waiting group to notify once stream is connected
-	connWg sync.WaitGroup //todo use a channel instead??
+	connWg *sync.WaitGroup //todo use a channel instead??
 }
 
 // Close Closes underlying connections to the Signal Exchange
@@ -55,11 +55,13 @@ func NewClient(ctx context.Context, addr string, key wgtypes.Key) (*Client, erro
 		return nil, err
 	}
 
+	var wg sync.WaitGroup
 	return &Client{
 		realClient: proto.NewSignalExchangeClient(conn),
 		ctx:        ctx,
 		signalConn: conn,
 		key:        key,
+		connWg:     &wg,
 	}, nil
 }
 
@@ -107,8 +109,6 @@ func (c *Client) connect(key string, msgHandler func(msg *proto.Message) error)
 	// add key fingerprint to the request header to be identified on the server side
 	md := metadata.New(map[string]string{proto.HeaderId: key})
 	ctx := metadata.NewOutgoingContext(c.ctx, md)
-	ctx, cancel := context.WithCancel(ctx)
-	defer cancel()
 
 	stream, err := c.realClient.ConnectStream(ctx)
 
@@ -116,6 +116,15 @@ func (c *Client) connect(key string, msgHandler func(msg *proto.Message) error)
 	if err != nil {
 		return err
 	}
+	// blocks
+	header, err := c.stream.Header()
+	if err != nil {
+		return err
+	}
+	registered := header.Get(proto.HeaderRegistered)
+	if len(registered) == 0 {
+		return fmt.Errorf("didn't receive a registration header from the Signal server whille connecting to the streams")
+	}
 	//connection established we are good to use the stream
 	c.connWg.Done()
 

signal/proto/constants.go

@@ -2,3 +2,4 @@ package proto
 
 // protocol constants, field names that can be used by both client and server
 const HeaderId = "x-wiretrustee-peer-id"
+const HeaderRegistered = "x-wiretrustee-peer-registered"

signal/signal.go

@@ -12,20 +12,20 @@ import (
 	"io"
 )
 
-// SignalExchangeServer an instance of a Signal server
+// Server an instance of a Signal server
-type SignalExchangeServer struct {
+type Server struct {
 	registry *peer.Registry
 }
 
 // NewServer creates a new Signal server
-func NewServer() *SignalExchangeServer {
+func NewServer() *Server {
-	return &SignalExchangeServer{
+	return &Server{
 		registry: peer.NewRegistry(),
 	}
 }
 
 // Send forwards a message to the signal peer
-func (s *SignalExchangeServer) Send(ctx context.Context, msg *proto.EncryptedMessage) (*proto.EncryptedMessage, error) {
+func (s *Server) Send(ctx context.Context, msg *proto.EncryptedMessage) (*proto.EncryptedMessage, error) {
 
 	if !s.registry.IsPeerRegistered(msg.Key) {
 		return nil, fmt.Errorf("unknown peer %s", msg.Key)
@@ -46,14 +46,20 @@ func (s *SignalExchangeServer) Send(ctx context.Context, msg *proto.EncryptedMes
 }
 
 // ConnectStream connects to the exchange stream
-func (s *SignalExchangeServer) ConnectStream(stream proto.SignalExchange_ConnectStreamServer) error {
+func (s *Server) ConnectStream(stream proto.SignalExchange_ConnectStreamServer) error {
 	p, err := s.connectPeer(stream)
 	if err != nil {
 		return err
 	}
 
-	log.Infof("peer [%s] has successfully connected", p.Id)
+	//needed to confirm that the peer has been registered so that the client can proceed
+	header := metadata.Pairs(proto.HeaderRegistered, "1")
+	err = stream.SendHeader(header)
+	if err != nil {
+		return err
+	}
 
+	log.Infof("peer [%s] has successfully connected", p.Id)
 	for {
 		msg, err := stream.Recv()
 		if err == io.EOF {
@@ -83,7 +89,7 @@ func (s *SignalExchangeServer) ConnectStream(stream proto.SignalExchange_Connect
 // Handles initial Peer connection.
 // Each connection must provide an ID header.
 // At this moment the connecting Peer will be registered in the peer.Registry
-func (s SignalExchangeServer) connectPeer(stream proto.SignalExchange_ConnectStreamServer) (*peer.Peer, error) {
+func (s Server) connectPeer(stream proto.SignalExchange_ConnectStreamServer) (*peer.Peer, error) {
 	if meta, hasMeta := metadata.FromIncomingContext(stream.Context()); hasMeta {
 		if id, found := meta[proto.HeaderId]; found {
 			p := peer.NewPeer(id[0], stream)

signal/signal_suite_test.go

@@ -0,0 +1,13 @@
+package signal_test
+
+import (
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+
+	"testing"
+)
+
+func TestSignal(t *testing.T) {
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "Signal Suite")
+}

signal/signal_test.go

@@ -0,0 +1,199 @@
+package signal_test
+
+import (
+	"context"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+	log "github.com/sirupsen/logrus"
+	"github.com/wiretrustee/wiretrustee/signal"
+	sigProto "github.com/wiretrustee/wiretrustee/signal/proto"
+	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/keepalive"
+	"google.golang.org/grpc/metadata"
+	"net"
+	"sync"
+	"time"
+)
+
+var _ = Describe("Client", func() {
+
+	var (
+		addr     string
+		listener net.Listener
+		server   *grpc.Server
+	)
+
+	BeforeEach(func() {
+		server, listener = startSignal()
+		addr = listener.Addr().String()
+
+	})
+
+	AfterEach(func() {
+		server.Stop()
+		listener.Close()
+	})
+
+	Describe("Exchanging messages", func() {
+		Context("between connected peers", func() {
+			It("should be successful", func() {
+
+				var msgReceived sync.WaitGroup
+				msgReceived.Add(2)
+
+				var receivedOnA string
+				var receivedOnB string
+
+				// connect PeerA to Signal
+				keyA, _ := wgtypes.GenerateKey()
+				clientA := createSignalClient(addr, keyA)
+				clientA.Receive(func(msg *sigProto.Message) error {
+					receivedOnA = msg.GetBody().GetPayload()
+					msgReceived.Done()
+					return nil
+				})
+				clientA.WaitConnected()
+
+				// connect PeerB to Signal
+				keyB, _ := wgtypes.GenerateKey()
+				clientB := createSignalClient(addr, keyB)
+				clientB.Receive(func(msg *sigProto.Message) error {
+					receivedOnB = msg.GetBody().GetPayload()
+					err := clientB.Send(&sigProto.Message{
+						Key:       keyB.PublicKey().String(),
+						RemoteKey: keyA.PublicKey().String(),
+						Body:      &sigProto.Body{Payload: "pong"},
+					})
+					if err != nil {
+						Fail("failed sending a message to PeerA")
+					}
+					msgReceived.Done()
+					return nil
+				})
+				clientB.WaitConnected()
+
+				// PeerA initiates ping-pong
+				err := clientA.Send(&sigProto.Message{
+					Key:       keyA.PublicKey().String(),
+					RemoteKey: keyB.PublicKey().String(),
+					Body:      &sigProto.Body{Payload: "ping"},
+				})
+				if err != nil {
+					Fail("failed sending a message to PeerB")
+				}
+
+				if waitTimeout(&msgReceived, 3*time.Second) {
+					Fail("test timed out on waiting for peers to exchange messages")
+				}
+
+				Expect(receivedOnA).To(BeEquivalentTo("pong"))
+				Expect(receivedOnB).To(BeEquivalentTo("ping"))
+
+			})
+		})
+	})
+
+	Describe("Connecting to the Signal stream channel", func() {
+		Context("with a signal client", func() {
+			It("should be successful", func() {
+
+				key, _ := wgtypes.GenerateKey()
+				client := createSignalClient(addr, key)
+				client.Receive(func(msg *sigProto.Message) error {
+					return nil
+				})
+				client.WaitConnected()
+
+				Expect(client).NotTo(BeNil())
+			})
+		})
+
+		Context("with a raw client and no ID header", func() {
+			It("should fail", func() {
+
+				client := createRawSignalClient(addr)
+				stream, err := client.ConnectStream(context.Background())
+				if err != nil {
+					Fail("error connecting to stream")
+				}
+
+				_, err = stream.Recv()
+
+				Expect(stream).NotTo(BeNil())
+				Expect(err).NotTo(BeNil())
+			})
+		})
+
+		Context("with a raw client and with an ID header", func() {
+			It("should be successful", func() {
+
+				md := metadata.New(map[string]string{sigProto.HeaderId: "peer"})
+				ctx := metadata.NewOutgoingContext(context.Background(), md)
+
+				client := createRawSignalClient(addr)
+				stream, err := client.ConnectStream(ctx)
+
+				Expect(stream).NotTo(BeNil())
+				Expect(err).To(BeNil())
+			})
+		})
+
+	})
+
+})
+
+func createSignalClient(addr string, key wgtypes.Key) *signal.Client {
+	client, err := signal.NewClient(context.Background(), addr, key)
+	if err != nil {
+		Fail("failed creating signal client")
+	}
+	return client
+}
+
+func createRawSignalClient(addr string) sigProto.SignalExchangeClient {
+	ctx := context.Background()
+	conn, err := grpc.DialContext(ctx, addr, grpc.WithInsecure(),
+		grpc.WithBlock(),
+		grpc.WithKeepaliveParams(keepalive.ClientParameters{
+			Time:    3 * time.Second,
+			Timeout: 2 * time.Second,
+		}))
+	if err != nil {
+		Fail("failed creating raw signal client")
+	}
+
+	return sigProto.NewSignalExchangeClient(conn)
+}
+
+func startSignal() (*grpc.Server, net.Listener) {
+	lis, err := net.Listen("tcp", ":0")
+	if err != nil {
+		panic(err)
+	}
+	s := grpc.NewServer()
+	sigProto.RegisterSignalExchangeServer(s, signal.NewServer())
+	go func() {
+		if err := s.Serve(lis); err != nil {
+			log.Fatalf("failed to serve: %v", err)
+		}
+	}()
+
+	return s, lis
+}
+
+// waitTimeout waits for the waitgroup for the specified max timeout.
+// Returns true if waiting timed out.
+func waitTimeout(wg *sync.WaitGroup, timeout time.Duration) bool {
+	c := make(chan struct{})
+	go func() {
+		defer close(c)
+		wg.Wait()
+	}()
+	select {
+	case <-c:
+		return false // completed normally
+	case <-time.After(timeout):
+		return true // timed out
+	}
+}