[relay] Feature/relay integration (#2244)

This update adds new relay integration for NetBird clients. The new relay is based on web sockets and listens on a single port.

- Adds new relay implementation with websocket with single port relaying mechanism
- refactor peer connection logic, allowing upgrade and downgrade from/to P2P connection
- peer connections are faster since it connects first to relay and then upgrades to P2P
- maintains compatibility with old clients by not using the new relay
- updates infrastructure scripts with new relay service

signal/client/client.go

@@ -51,11 +51,10 @@ func UnMarshalCredential(msg *proto.Message) (*Credential, error) {
 }
 
 // MarshalCredential marshal a Credential instance and returns a Message object
-func MarshalCredential(myKey wgtypes.Key, myPort int, remoteKey wgtypes.Key, credential *Credential, t proto.Body_Type,
-	rosenpassPubKey []byte, rosenpassAddr string) (*proto.Message, error) {
+func MarshalCredential(myKey wgtypes.Key, myPort int, remoteKey string, credential *Credential, t proto.Body_Type, rosenpassPubKey []byte, rosenpassAddr string, relaySrvAddress string) (*proto.Message, error) {
 	return &proto.Message{
 		Key:       myKey.PublicKey().String(),
-		RemoteKey: remoteKey.String(),
+		RemoteKey: remoteKey,
 		Body: &proto.Body{
 			Type:           t,
 			Payload:        fmt.Sprintf("%s:%s", credential.UFrag, credential.Pwd),
@@ -65,6 +64,7 @@ func MarshalCredential(myKey wgtypes.Key, myPort int, remoteKey wgtypes.Key, cre
 				RosenpassPubKey:     rosenpassPubKey,
 				RosenpassServerAddr: rosenpassAddr,
 			},
+			RelayServerAddress: relaySrvAddress,
 		},
 	}, nil
 }

signal/proto/signalexchange.pb.go

@@ -1,15 +1,15 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.26.0
-// 	protoc        v3.12.4
+// 	protoc        v3.21.12
 // source: signalexchange.proto
 
 package proto
 
 import (
-	_ "github.com/golang/protobuf/protoc-gen-go/descriptor"
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	_ "google.golang.org/protobuf/types/descriptorpb"
 	reflect "reflect"
 	sync "sync"
 )
@@ -225,6 +225,8 @@ type Body struct {
 	FeaturesSupported []uint32 `protobuf:"varint,6,rep,packed,name=featuresSupported,proto3" json:"featuresSupported,omitempty"`
 	// RosenpassConfig is a Rosenpass config of the remote peer our peer tries to connect to
 	RosenpassConfig *RosenpassConfig `protobuf:"bytes,7,opt,name=rosenpassConfig,proto3" json:"rosenpassConfig,omitempty"`
+	// relayServerAddress is an IP:port of the relay server
+	RelayServerAddress string `protobuf:"bytes,8,opt,name=relayServerAddress,proto3" json:"relayServerAddress,omitempty"`
 }
 
 func (x *Body) Reset() {
@@ -308,6 +310,13 @@ func (x *Body) GetRosenpassConfig() *RosenpassConfig {
 	return nil
 }
 
+func (x *Body) GetRelayServerAddress() string {
+	if x != nil {
+		return x.RelayServerAddress
+	}
+	return ""
+}
+
 // Mode indicates a connection mode
 type Mode struct {
 	state         protoimpl.MessageState
@@ -431,7 +440,7 @@ var file_signalexchange_proto_rawDesc = []byte{
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@@ -451,7 +460,10 @@ var file_signalexchange_proto_rawDesc = []byte{
 	0x20, 0x01, 0x28, 0x0b, 0x32, 0x1f, 0x2e, 0x73, 0x69, 0x67, 0x6e, 0x61, 0x6c, 0x65, 0x78, 0x63,
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signal/proto/signalexchange.proto

@@ -60,6 +60,9 @@ message Body {
 
   // RosenpassConfig is a Rosenpass config of the remote peer our peer tries to connect to
   RosenpassConfig rosenpassConfig = 7;
+
+  // relayServerAddress is url of the relay server
+  string relayServerAddress = 8;
 }
 
 // Mode indicates a connection mode