use Rng from pool if possible

libi2pd/Datagram.cpp

@@ -422,7 +422,7 @@ namespace datagram
 						{
 							auto pool = m_LocalDestination->GetTunnelPool ();
 							if (pool)
-								idx = m_LocalDestination->GetTunnelPool ()->GetRng ()() % sz;
+								idx = pool->GetRng ()() % sz;
 						}
 						if (idx < 0) idx = rand () % sz;
 						path->remoteLease = ls[idx];
@@ -455,7 +455,7 @@ namespace datagram
 					{
 						auto pool = m_LocalDestination->GetTunnelPool ();
 						if (pool)
-							idx = m_LocalDestination->GetTunnelPool ()->GetRng ()() % sz;
+							idx = pool->GetRng ()() % sz;
 					}
 					if (idx < 0) idx = rand () % sz;
 					path->remoteLease = ls[idx];

libi2pd/Streaming.cpp

@@ -459,7 +459,6 @@ namespace stream
 
 	void Stream::ProcessAck (Packet * packet)
 	{
-		srand (time(NULL));
 		bool acknowledged = false;
 		auto ts = i2p::util::GetMillisecondsSinceEpoch ();
 		uint32_t ackThrough = packet->GetAckThrough ();
@@ -514,7 +513,7 @@ namespace stream
 				acknowledged = true;
 				ackCount++;
 				if (m_WindowSize < MAX_WINDOW_SIZE && !m_IsFirstACK)
-					if (m_RTT < rand () % INITIAL_RTT) // dirty
+					if (m_RTT < m_LocalDestination.GetRandom () % INITIAL_RTT) // dirty
 						m_WindowIncCounter++;
 			}
 			else
@@ -1410,7 +1409,7 @@ namespace stream
 				}
 				if (!updated)
 				{
-					uint32_t i = rand () % leases.size ();
+					uint32_t i = m_LocalDestination.GetRandom () % leases.size ();
 					if (m_CurrentRemoteLease && leases[i]->tunnelID == m_CurrentRemoteLease->tunnelID)
 						// make sure we don't select previous
 						i = (i + 1) % leases.size (); // if so, pick next
@@ -1811,5 +1810,15 @@ namespace stream
 		return msg;
 	}
 
+	uint32_t StreamingDestination::GetRandom ()
+	{
+		if (m_Owner)
+		{	
+			auto pool = m_Owner->GetTunnelPool ();
+			if (pool) 
+				return pool->GetRng ()();
+		}
+		return rand ();
+	}	
 }
 }

libi2pd/Streaming.h

@@ -321,6 +321,7 @@ namespace stream
 
 			Packet * NewPacket () { return m_PacketsPool.Acquire(); }
 			void DeletePacket (Packet * p) { return m_PacketsPool.Release(p); }
+			uint32_t GetRandom ();
 
 		private: