decrypt frames correctly and set return address

llarp/handlers/tun.cpp

@@ -201,8 +201,9 @@ namespace llarp
                                    service::ProtocolMessage *msg)
     {
       EnsureReplyPath(msg->sender);
-
-      uint32_t themIP = ObtainIPForAddr(msg->sender.Addr());
+      service::Address addr;
+      msg->sender.CalculateAddress(addr.data());
+      uint32_t themIP = ObtainIPForAddr(addr);
       uint32_t usIP   = m_OurIP;
       auto buf        = llarp::Buffer(msg->payload);
       if(m_NetworkToUserPktQueue.EmplaceIf(

llarp/service/protocol.cpp

@@ -155,9 +155,10 @@ namespace llarp
                                       const byte_t* sharedkey,
                                       ProtocolMessage& msg) const
     {
-      msg.PutBuffer(D.Buffer());
-      auto buf = llarp::Buffer(msg.payload);
-      return crypto->xchacha20(buf, sharedkey, N);
+      Encrypted tmp = D;
+      auto buf      = tmp.Buffer();
+      crypto->xchacha20(*buf, sharedkey, N);
+      return msg.BDecode(buf);
     }
 
     bool