add option to only connect to certain routers

Config.cpp

@@ -184,6 +184,7 @@ namespace config {
   	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.routers", value<std::string>()->default_value(""), "Only Connect to these routers")
       ("trust.hidden", value<bool>()->default_value(false), "should we hide our router from other routers?");
 
     m_OptionsDesc

Daemon.cpp

@@ -194,12 +194,40 @@ namespace i2p
       {
         LogPrint(eLogInfo, "Daemon: explicit trust enabled");
         std::string fam; i2p::config::GetOption("trust.family", fam);
+				std::string routers; i2p::config::GetOption("trust.routers", routers);
+				bool restricted = false;
         if (fam.length() > 0)
         {
-          LogPrint(eLogInfo, "Daemon: setting restricted routes to use family ", fam);
+					std::set<std::string> fams;
-          i2p::transport::transports.RestrictRoutes({fam});
+					size_t pos = 0, comma;
-        } else
+					do
-          LogPrint(eLogError, "Daemon: no family specified for restricted routes");
+					{
+						comma = fam.find (',', pos);
+						fams.insert (fam.substr (pos, comma != std::string::npos ? comma - pos : std::string::npos));
+						pos = comma + 1;
+					}
+					while (comma != std::string::npos);				 
+					i2p::transport::transports.RestrictRoutesToFamilies(fams);
+					restricted  = fams.size() > 0;
+        }
+				if (routers.length() > 0) {
+					std::set<i2p::data::IdentHash> idents;
+					size_t pos = 0, comma;
+					do
+					{
+						comma = routers.find (',', pos);
+						i2p::data::IdentHash ident;
+						ident.FromBase64 (routers.substr (pos, comma != std::string::npos ? comma - pos : std::string::npos));	
+						idents.insert (ident);
+						pos = comma + 1;
+					}
+					while (comma != std::string::npos);				 
+					LogPrint(eLogInfo, "Daemon: setting restricted routes to use ", idents.size(), " trusted routesrs");
+					i2p::transport::transports.RestrictRoutesToRouters(idents);
+					restricted = idents.size() > 0;
+				}
+				if(!restricted)
+					LogPrint(eLogError, "Daemon: no trusted routers of families specififed");
       }
       bool hidden; i2p::config::GetOption("trust.hidden", hidden);
       if (hidden)

NetDb.cpp

@@ -126,10 +126,8 @@ namespace data
 					i2p::context.CleanupDestination ();
 					lastDestinationCleanup = ts;
 				}
-        // if we're in hidden mode don't publish or explore
-				// if (m_HiddenMode) continue;
         
-				if (ts - lastPublish >= NETDB_PUBLISH_INTERVAL) // publish 
+				if (ts - lastPublish >= NETDB_PUBLISH_INTERVAL && !m_HiddenMode) // publish 
 				{
 					Publish ();
 					lastPublish = ts;
@@ -148,7 +146,8 @@ namespace data
 						if (numRouters < 1) numRouters = 1;
 						if (numRouters > 9) numRouters = 9;	
 						m_Requests.ManageRequests ();
-						Explore (numRouters);
+						if(!m_HiddenMode)
+							Explore (numRouters);
 						lastExploratory = ts;
 					}	
 				}	

Transports.cpp

@@ -241,6 +241,7 @@ namespace transport
 				i2p::HandleI2NPMessage (it);
 			return;
 		}
+		if(RoutesRestricted() && ! IsRestrictedPeer(ident)) return;
 		auto it = m_Peers.find (ident);
 		if (it == m_Peers.end ())
 		{
@@ -494,6 +495,12 @@ namespace transport
 		
 	void Transports::DetectExternalIP ()
 	{
+		if (RoutesRestricted())
+  	{
+			LogPrint(eLogInfo, "Transports: restricted routes enabled, not detecting ip");
+			i2p::context.SetStatus (eRouterStatusFirewalled);
+			return;
+		}
 		if (m_SSUServer)
 		{
 #ifndef MESHNET
@@ -520,8 +527,10 @@ namespace transport
 
 	void Transports::PeerTest ()
 	{
+		if (RoutesRestricted()) return;
 		if (m_SSUServer)
 		{
+			
 			bool statusChanged = false;
 			for (int i = 0; i < 5; i++)
 			{
@@ -578,6 +587,12 @@ namespace transport
 			}
 			else // incoming connection
 			{
+				if(RoutesRestricted() && ! IsRestrictedPeer(ident)) {
+					// not trusted
+					LogPrint(eLogWarning, "Transports: closing untrusted inbound connection from ", ident.ToBase64());
+					session->Done();
+					return;
+				}
 				session->SendI2NPMessages ({ CreateDatabaseStoreMsg () }); // send DatabaseStore
 				std::unique_lock<std::mutex>	l(m_PeersMutex);	
 				m_Peers.insert (std::make_pair (ident, Peer{ 0, nullptr, { session }, i2p::util::GetSecondsSinceEpoch (), {} }));
@@ -655,7 +670,7 @@ namespace transport
 		std::advance (it, rand () % m_Peers.size ());	
 		return it != m_Peers.end () ? it->second.router : nullptr;
 	}
-  void Transports::RestrictRoutes(std::vector<std::string> families)
+  void Transports::RestrictRoutesToFamilies(std::set<std::string> families)
   {
     std::lock_guard<std::mutex> lock(m_FamilyMutex);
     m_TrustedFamilies.clear();
@@ -663,22 +678,71 @@ namespace transport
       m_TrustedFamilies.push_back(fam);
   }
 
+	void Transports::RestrictRoutesToRouters(std::set<i2p::data::IdentHash> routers)
+	{
+		std::unique_lock<std::mutex> lock(m_TrustedRoutersMutex);
+		m_TrustedRouters.clear();
+		for (const auto & ri : routers )
+			m_TrustedRouters.push_back(ri);
+	}
+	
   bool Transports::RoutesRestricted() const {
-    std::lock_guard<std::mutex> lock(m_FamilyMutex);
+    std::unique_lock<std::mutex> famlock(m_FamilyMutex);
-    return m_TrustedFamilies.size() > 0;
+		std::unique_lock<std::mutex> routerslock(m_TrustedRoutersMutex);
+    return m_TrustedFamilies.size() > 0 || m_TrustedRouters.size() > 0;
   }
 
   /** XXX: if routes are not restricted this dies */
-  std::shared_ptr<const i2p::data::RouterInfo> Transports::GetRestrictedPeer() const {
+  std::shared_ptr<const i2p::data::RouterInfo> Transports::GetRestrictedPeer() const
-    std::string fam;
+	{
-    {
+		{
-      std::lock_guard<std::mutex> lock(m_FamilyMutex);
+			std::lock_guard<std::mutex> l(m_FamilyMutex);
-      // TODO: random family (?)
+			std::string fam;
-      fam = m_TrustedFamilies[0];
+			auto sz = m_TrustedFamilies.size();
-    }
+			if(sz > 1)
-    boost::to_lower(fam);
+			{
-    return i2p::data::netdb.GetRandomRouterInFamily(fam);
+				auto it = m_TrustedFamilies.begin ();
+				std::advance(it, rand() % sz);
+				fam = *it;
+				boost::to_lower(fam);
+			}
+			else if (sz == 1)
+			{
+				fam = m_TrustedFamilies[0];
+			}
+			if (fam.size())
+				return i2p::data::netdb.GetRandomRouterInFamily(fam);
+		}
+		{
+			std::unique_lock<std::mutex> l(m_TrustedRoutersMutex);
+			auto sz = m_TrustedRouters.size();
+			if (sz)
+			{
+				if(sz == 1)
+					return i2p::data::netdb.FindRouter(m_TrustedRouters[0]);
+				auto it = m_TrustedRouters.begin();
+				std::advance(it, rand() % sz);
+				return i2p::data::netdb.FindRouter(*it);
+			}
+		}
+		return nullptr;
   }
+
+	bool Transports::IsRestrictedPeer(const i2p::data::IdentHash & ih) const
+	{
+		{
+			std::unique_lock<std::mutex> l(m_TrustedRoutersMutex);
+			for (const auto & r : m_TrustedRouters )
+				if ( r == ih ) return true;
+		}
+		{
+			std::unique_lock<std::mutex> l(m_FamilyMutex);
+			auto ri = i2p::data::netdb.FindRouter(ih);
+			for (const auto & fam : m_TrustedFamilies)
+				if(ri->IsFamily(fam)) return true;
+		}
+		return false;
+	}
 }
 }
 

Transports.h

@@ -110,7 +110,11 @@ namespace transport
     /** do we want to use restricted routes? */
     bool RoutesRestricted() const;  
     /** restrict routes to use only these router families for first hops */
-    void RestrictRoutes(std::vector<std::string> families);
+    void RestrictRoutesToFamilies(std::set<std::string> families);
+    /** restrict routes to use only these routers for first hops */
+    void RestrictRoutesToRouters(std::set<i2p::data::IdentHash> routers);
+
+    bool IsRestrictedPeer(const i2p::data::IdentHash & ident) const;
     
 			void PeerTest ();
 			
@@ -158,6 +162,10 @@ namespace transport
     std::vector<std::string> m_TrustedFamilies;
     mutable std::mutex m_FamilyMutex;
 
+    /** which routers for first hop to trust */
+    std::vector<i2p::data::IdentHash> m_TrustedRouters;
+    mutable std::mutex m_TrustedRoutersMutex;
+    
 		public:
 
 			// for HTTP only

Tunnel.cpp

@@ -644,7 +644,9 @@ namespace tunnel
 		{
 			// trying to create one more oubound tunnel
 			auto inboundTunnel = GetNextInboundTunnel ();
-			auto router = i2p::data::netdb.GetRandomRouter ();
+			auto router = i2p::transport::transports.RoutesRestricted() ?
+				i2p::transport::transports.GetRestrictedPeer() :
+				i2p::data::netdb.GetRandomRouter ();
 			if (!inboundTunnel || !router) return;
 			LogPrint (eLogDebug, "Tunnel: creating one hop outbound tunnel");
 			CreateTunnel<OutboundTunnel> (
@@ -706,7 +708,9 @@ namespace tunnel
 		if (m_OutboundTunnels.empty () || m_InboundTunnels.size () < 5) 
 		{
 			// trying to create one more inbound tunnel
-			auto router = i2p::data::netdb.GetRandomRouter ();
+			auto router = i2p::transport::transports.RoutesRestricted() ?
+				i2p::transport::transports.GetRestrictedPeer() :
+				i2p::data::netdb.GetRandomRouter ();
 			if (!router) {
 				LogPrint (eLogWarning, "Tunnel: can't find any router, skip creating tunnel");
 				return;