From 93deb37c94e43a4df0e32544550e9e1b348381b6 Mon Sep 17 00:00:00 2001
From: Jeff Becker <ampernand@gmail.com>
Date: Sat, 18 Jun 2016 11:10:58 -0400
Subject: [PATCH] add primordial goo tier "hidden mode" (aka toy feature needs
 more work doesn't do it correctly all the way)

---
 Config.cpp     |  5 +++--
 Daemon.cpp     |  6 ++++++
 NetDb.cpp      | 13 +++++++++++--
 NetDb.h        |  6 ++++++
 TunnelPool.cpp |  1 +
 5 files changed, 27 insertions(+), 4 deletions(-)

diff --git a/Config.cpp b/Config.cpp
index 474ee0e5..3fbbd210 100644
--- a/Config.cpp
+++ b/Config.cpp
@@ -211,8 +211,9 @@ 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)
 	  .add(limits)	
diff --git a/Daemon.cpp b/Daemon.cpp
index 96f9fe05..1df0482b 100644
--- a/Daemon.cpp
+++ b/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;
 		}
diff --git a/NetDb.cpp b/NetDb.cpp
index 0ac2bb3a..ede0e0ac 100644
--- a/NetDb.cpp
+++ b/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)
 	{
 	}
 	
@@ -121,7 +121,11 @@ namespace data
 						ManageLookupResponses ();
 					}	
 					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;	
diff --git a/NetDb.h b/NetDb.h
index 96308ee7..6456620e 100644
--- a/NetDb.h
+++ b/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;
diff --git a/TunnelPool.cpp b/TunnelPool.cpp
index bbcbfb82..eb72cda3 100644
--- a/TunnelPool.cpp
+++ b/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());