add primordial goo tier "hidden mode" (aka toy feature needs more work doesn't do it correctly all the way)

Config.cpp

@@ -211,7 +211,8 @@ namespace config {
   options_description trust("Trust options");
   trust.add_options()
     ("trust.enabled", value<bool>()->default_value(false), "enable explicit trust options")
-    ("trust.family", value<std::string>()->default_value(""), "Router Familiy to trust for first hops");
+    ("trust.family", value<std::string>()->default_value(""), "Router Familiy to trust for first hops")
+    ("trust.hidden", value<bool>()->default_value(false), "should we hide our router from other routers?");
   
     m_OptionsDesc
       .add(general)

Daemon.cpp

@@ -204,6 +204,12 @@ namespace i2p
           i2p::transport::transports.RestrictRoutes({fam});
         } else
           LogPrint(eLogError, "Daemon: no family specified for restricted routes");
+      }
+      bool hidden; i2p::config::GetOption("trust.hidden", hidden);
+      if (hidden)
+      {
+        LogPrint(eLogInfo, "Daemon: using hidden mode");
+        i2p::data::netdb.SetHidden(true);
       }
 			return true;
 		}

NetDb.cpp

@@ -24,7 +24,7 @@ namespace data
 {		
 	NetDb netdb;
 
-	NetDb::NetDb (): m_IsRunning (false), m_Thread (nullptr), m_Reseeder (nullptr), m_Storage("netDb", "r", "routerInfo-", "dat")
+	NetDb::NetDb (): m_IsRunning (false), m_Thread (nullptr), m_Reseeder (nullptr), m_Storage("netDb", "r", "routerInfo-", "dat"), m_HiddenMode(false)
 	{
 	}
 	
@@ -122,6 +122,10 @@ namespace data
 					}	
 					lastSave = ts;
 				}
+
+        // if we're in hidden mode don't publish or explore
+        if (m_HiddenMode) continue;
+        
 				if (ts - lastPublish >= 2400) // publish every 40 minutes
 				{
 					Publish ();
@@ -161,6 +165,11 @@ namespace data
 		return false;
 	}
 
+  void NetDb::SetHidden(bool hide) {
+    // TODO: remove reachable addresses from router info
+    m_HiddenMode = hide;
+  }
+  
 	bool NetDb::AddRouterInfo (const IdentHash& ident, const uint8_t * buf, int len)
 	{	
 		bool updated = true;	

NetDb.h

@@ -67,6 +67,9 @@ namespace data
 
 			void PostI2NPMsg (std::shared_ptr<const I2NPMessage> msg);
 
+      /** set hidden mode, aka don't publish our RI to netdb and don't explore */
+      void SetHidden(bool hide); 
+      
 			void Reseed ();
 			Families& GetFamilies () { return m_Families; };
 
@@ -112,6 +115,9 @@ namespace data
 			NetDbRequests m_Requests;
 
 			std::map<IdentHash, std::pair<std::vector<IdentHash>, uint64_t> > m_LookupResponses; // ident->(closest FFs, timestamp)
+
+      /** true if in hidden mode */
+      bool m_HiddenMode;
 	};
 
 	extern NetDb netdb;

TunnelPool.cpp

@@ -333,6 +333,7 @@ namespace tunnel
 		int numHops = isInbound ? m_NumInboundHops : m_NumOutboundHops;
     if(i2p::transport::transports.RoutesRestricted())
     {
+      /** if routes are restricted prepend trusted first hop */
       auto hop = i2p::transport::transports.GetRestrictedPeer();
       if(!hop) return false;
       peers.push_back(hop->GetRouterIdentity());