check if session socket was closed before tunnels were built

libi2pd_client/SAM.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2022, The PurpleI2P Project
+* Copyright (c) 2013-2023, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -439,6 +439,8 @@ namespace client
 	void SAMSocket::HandleSessionReadinessCheckTimer (const boost::system::error_code& ecode)
 	{
 		if (ecode != boost::asio::error::operation_aborted)
+		{
+			if (m_Socket.is_open ())
 			{
 				auto session = m_Owner.FindSession(m_ID);
 				if(session)
@@ -453,6 +455,9 @@ namespace client
 					}
 				}
 			}
+			else
+				Terminate ("SAM: session socket closed");
+		}
 	}
 
 	void SAMSocket::SendSessionCreateReplyOk ()

libi2pd_client/SAM.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2021, The PurpleI2P Project
+* Copyright (c) 2013-2023, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -30,7 +30,7 @@ namespace client
 {
 	const size_t SAM_SOCKET_BUFFER_SIZE = 8192;
 	const int SAM_SOCKET_CONNECTION_MAX_IDLE = 3600; // in seconds
-	const int SAM_SESSION_READINESS_CHECK_INTERVAL = 20; // in seconds
+	const int SAM_SESSION_READINESS_CHECK_INTERVAL = 3; // in seconds
 	const char SAM_HANDSHAKE[] = "HELLO VERSION";
 	const char SAM_HANDSHAKE_REPLY[] = "HELLO REPLY RESULT=OK VERSION=%s\n";
 	const char SAM_HANDSHAKE_NOVERSION[] = "HELLO REPLY RESULT=NOVERSION\n";