use weak_ptr for Bob's peer tests and relay tags

libi2pd/SSU2.cpp

@@ -370,7 +370,7 @@ namespace transport
 			{
 				std::vector<Packet *> packets;
 				packets.push_back (packet);
-				while (moreBytes && packets.size () < 32)
+				while (moreBytes && packets.size () < SSU2_MAX_NUM_PACKETS_PER_BATCH)
 				{
 					packet = m_PacketsPool.AcquireMt ();
 					packet->len = socket.receive_from (boost::asio::buffer (packet->buf, SSU2_MAX_PACKET_SIZE), packet->from, 0, ec);
@@ -599,10 +599,13 @@ namespace transport
 		auto it = m_Relays.find (tag);
 		if (it != m_Relays.end ())
 		{
-			if (it->second->IsEstablished ())
-				return it->second;
-			else
-				m_Relays.erase (it);
+			if (!it->second.expired ())
+			{	
+				auto s = it->second.lock ();
+				if (s && s->IsEstablished ())
+					return s;
+			}	
+			m_Relays.erase (it);
 		}
 		return nullptr;
 	}
@@ -1045,7 +1048,7 @@ namespace transport
 			auto ts = i2p::util::GetSecondsSinceEpoch ();
 			for (auto it = m_Relays.begin (); it != m_Relays.begin ();)
 			{
-				if (it->second && it->second->GetState () == eSSU2SessionStateTerminated)
+				if (it->second.expired ())
 					it = m_Relays.erase (it);
 				else
 					it++;

libi2pd/SSU2.h

@@ -40,6 +40,7 @@ namespace transport
 	const int SSU2_KEEP_ALIVE_INTERVAL_VARIANCE = 4; // in seconds
 	const int SSU2_PROXY_CONNECT_RETRY_TIMEOUT = 30; // in seconds
 	const int SSU2_HOLE_PUNCH_EXPIRATION = 150; // in seconds
+	const size_t SSU2_MAX_NUM_PACKETS_PER_BATCH = 32;
 
 	class SSU2Server: private i2p::util::RunnableServiceWithWork
 	{
@@ -168,7 +169,7 @@ namespace transport
 			std::map<boost::asio::ip::udp::endpoint, std::shared_ptr<SSU2Session> > m_PendingOutgoingSessions;
 			mutable std::mutex m_PendingOutgoingSessionsMutex;
 			std::map<boost::asio::ip::udp::endpoint, std::pair<uint64_t, uint32_t> > m_IncomingTokens, m_OutgoingTokens; // remote endpoint -> (token, expires in seconds)
-			std::unordered_map<uint32_t, std::shared_ptr<SSU2Session> > m_Relays; // we are introducer, relay tag -> session
+			std::unordered_map<uint32_t, std::weak_ptr<SSU2Session> > m_Relays; // we are introducer, relay tag -> session
 			std::list<i2p::data::IdentHash> m_Introducers, m_IntroducersV6; // introducers we are connected to
 			i2p::util::MemoryPoolMt<Packet> m_PacketsPool;
 			i2p::util::MemoryPool<SSU2SentPacket> m_SentPacketsPool;

libi2pd/SSU2Session.cpp

@@ -2252,27 +2252,31 @@ namespace transport
 			case 3: // Bob from Charlie
 			{
 				auto it = m_PeerTests.find (nonce);
-				if (it != m_PeerTests.end () && it->second.first)
+				if (it != m_PeerTests.end ())
 				{
-					uint8_t payload[SSU2_MAX_PACKET_SIZE];
-					// Charlie's RouterInfo
-					auto r = i2p::data::netdb.FindRouter (GetRemoteIdentity ()->GetIdentHash ());
-					if (r && (r->IsUnreachable () || !i2p::data::netdb.PopulateRouterInfoBuffer (r))) r = nullptr;
-					size_t payloadSize = r ? CreateRouterInfoBlock (payload, m_MaxPayloadSize - len - 32, r) : 0;
-					if (!payloadSize && r)
-						it->second.first->SendFragmentedMessage (CreateDatabaseStoreMsg (r));
-					if (payloadSize + len + 16 > m_MaxPayloadSize)
-					{
-						// doesn't fit one message, send RouterInfo in separate message
-						it->second.first->SendData (payload, payloadSize);
-						payloadSize = 0;
-					}
-					// PeerTest to Alice
-					payloadSize += CreatePeerTestBlock (payload + payloadSize, m_MaxPayloadSize, 4,
-						(SSU2PeerTestCode)buf[1], GetRemoteIdentity ()->GetIdentHash (), buf + offset, len - offset);
-					if (payloadSize < m_MaxPayloadSize)
-						payloadSize += CreatePaddingBlock (payload + payloadSize, m_MaxPayloadSize - payloadSize);
-					it->second.first->SendData (payload, payloadSize);
+					auto aliceSession = it->second.first.lock ();
+					if (aliceSession && aliceSession->IsEstablished ())
+					{	
+						uint8_t payload[SSU2_MAX_PACKET_SIZE];
+						// Charlie's RouterInfo
+						auto r = i2p::data::netdb.FindRouter (GetRemoteIdentity ()->GetIdentHash ());
+						if (r && (r->IsUnreachable () || !i2p::data::netdb.PopulateRouterInfoBuffer (r))) r = nullptr;
+						size_t payloadSize = r ? CreateRouterInfoBlock (payload, m_MaxPayloadSize - len - 32, r) : 0;
+						if (!payloadSize && r)
+							aliceSession->SendFragmentedMessage (CreateDatabaseStoreMsg (r));
+						if (payloadSize + len + 16 > m_MaxPayloadSize)
+						{
+							// doesn't fit one message, send RouterInfo in separate message
+							aliceSession->SendData (payload, payloadSize);
+							payloadSize = 0;
+						}
+						// PeerTest to Alice
+						payloadSize += CreatePeerTestBlock (payload + payloadSize, m_MaxPayloadSize, 4,
+							(SSU2PeerTestCode)buf[1], GetRemoteIdentity ()->GetIdentHash (), buf + offset, len - offset);
+						if (payloadSize < m_MaxPayloadSize)
+							payloadSize += CreatePaddingBlock (payload + payloadSize, m_MaxPayloadSize - payloadSize);
+						aliceSession->SendData (payload, payloadSize);
+					}	
 					m_PeerTests.erase (it);
 				}
 				else
@@ -3028,9 +3032,9 @@ namespace transport
 		}
 		for (auto it = m_PeerTests.begin (); it != m_PeerTests.end ();)
 		{
-			if (ts > it->second.second + SSU2_PEER_TEST_EXPIRATION_TIMEOUT)
+			if (ts > it->second.second + SSU2_PEER_TEST_EXPIRATION_TIMEOUT || it->second.first.expired ())
 			{
-				LogPrint (eLogWarning, "SSU2: Peer test nonce ", it->first, " was not responded in ", SSU2_PEER_TEST_EXPIRATION_TIMEOUT, " seconds, deleted");
+				LogPrint (eLogWarning, "SSU2: Peer test nonce ", it->first, " was not responded in ", SSU2_PEER_TEST_EXPIRATION_TIMEOUT, " seconds or session invalid. Deleted");
 				it = m_PeerTests.erase (it);
 			}
 			else

libi2pd/SSU2Session.h

@@ -373,7 +373,7 @@ namespace transport
 			std::map<uint32_t, std::shared_ptr<SSU2SentPacket> > m_SentPackets; // packetNum -> packet
 			std::unordered_map<uint32_t, std::shared_ptr<SSU2IncompleteMessage> > m_IncompleteMessages; // msgID -> I2NP
 			std::unordered_map<uint32_t, std::pair <std::shared_ptr<SSU2Session>, uint64_t > > m_RelaySessions; // nonce->(Alice, timestamp) for Bob or nonce->(Charlie, timestamp) for Alice
-			std::unordered_map<uint32_t, std::pair <std::shared_ptr<SSU2Session>, uint64_t > > m_PeerTests; // same as for relay sessions
+			std::unordered_map<uint32_t, std::pair <std::weak_ptr<SSU2Session>, uint64_t > > m_PeerTests; // nonce->(Alice, timestamp). We are Bob
 			std::list<std::shared_ptr<I2NPMessage> > m_SendQueue;
 			i2p::I2NPMessagesHandler m_Handler;
 			bool m_IsDataReceived;