don't include same introducer twice

RouterContext.cpp

@@ -85,14 +85,17 @@ namespace i2p
 			UpdateRouterInfo ();
 	}
 
-	void RouterContext::AddIntroducer (const i2p::data::RouterInfo& routerInfo, uint32_t tag)
+	bool RouterContext::AddIntroducer (const i2p::data::RouterInfo& routerInfo, uint32_t tag)
 	{
+		bool ret = false;
 		auto address = routerInfo.GetSSUAddress ();
 		if (address)
 		{	
-			if (m_RouterInfo.AddIntroducer (address, tag))
+			ret = m_RouterInfo.AddIntroducer (address, tag);
+			if (ret)
 				UpdateRouterInfo ();
 		}	
+		return true;
 	}	
 
 	void RouterContext::RemoveIntroducer (const boost::asio::ip::udp::endpoint& e)

RouterContext.h

@@ -28,7 +28,7 @@ namespace i2p
 
 			void OverrideNTCPAddress (const char * host, int port); // temporary
 			void UpdateAddress (const char * host);	// called from SSU
-			void AddIntroducer (const i2p::data::RouterInfo& routerInfo, uint32_t tag);
+			bool AddIntroducer (const i2p::data::RouterInfo& routerInfo, uint32_t tag);
 			void RemoveIntroducer (const boost::asio::ip::udp::endpoint& e);
 			bool IsUnreachable () const { return m_IsUnreachable; };
 			void SetUnreachable ();				

SSU.cpp

@@ -1156,7 +1156,7 @@ namespace ssu
 		{
 			// timeout expired
 			std::list<boost::asio::ip::udp::endpoint> newList;
-			int numIntroducers = 0;
+			size_t numIntroducers = 0;
 			for (auto it :m_Introducers)
 			{	
 				auto session = FindSession (it);
@@ -1173,13 +1173,16 @@ namespace ssu
 			if (numIntroducers < SSU_MAX_NUM_INTRODUCERS)
 			{
 				// create new
-				auto introducers = FindIntroducers (SSU_MAX_NUM_INTRODUCERS - numIntroducers);
+				auto introducers = FindIntroducers (SSU_MAX_NUM_INTRODUCERS);
 				if (introducers.size () > 0)
 				{
 					for (auto it1: introducers)
 					{
-						i2p::context.AddIntroducer (*it1->GetRemoteRouter (), it1->GetRelayTag ());
+						if (i2p::context.AddIntroducer (*it1->GetRemoteRouter (), it1->GetRelayTag ()))
+						{	
 							newList.push_back (it1->GetRemoteEndpoint ());
+							if (newList.size () >= SSU_MAX_NUM_INTRODUCERS) break;
+						}	
 					}	
 				}	
 			}	

SSU.h

@@ -35,7 +35,7 @@ namespace ssu
 	const int SSU_TERMINATION_TIMEOUT = 330; // 5.5 minutes
 	const int SSU_KEEP_ALIVE_INTERVAL = 30; // 30 seconds	
 	const int SSU_TO_INTRODUCER_SESSION_DURATION = 3600; // 1 hour
-	const int SSU_MAX_NUM_INTRODUCERS = 3;
+	const size_t SSU_MAX_NUM_INTRODUCERS = 3;
 
 	// payload types (4 bits)
 	const uint8_t PAYLOAD_TYPE_SESSION_REQUEST = 0;