From ab0bd908ec6aef3a86a32f16372a46cce9c76177 Mon Sep 17 00:00:00 2001
From: orignal <i2porignal@yandex.ru>
Date: Sat, 7 Feb 2015 15:25:06 -0500
Subject: [PATCH] fixed race condition

---
 SSU.cpp        | 15 ++++++++++++---
 SSU.h          |  2 ++
 SSUSession.cpp | 18 +++++++++++-------
 SSUSession.h   |  2 ++
 4 files changed, 27 insertions(+), 10 deletions(-)

diff --git a/SSU.cpp b/SSU.cpp
index 6f9a80a6..91856345 100644
--- a/SSU.cpp
+++ b/SSU.cpp
@@ -161,7 +161,10 @@ namespace transport
 		{
 			session = std::make_shared<SSUSession> (*this, from);
 			session->WaitForConnect ();
-			m_Sessions[from] = session;
+			{
+				std::unique_lock<std::mutex> l(m_SessionsMutex);
+				m_Sessions[from] = session;
+			}	
 			LogPrint ("New SSU session from ", from.address ().to_string (), ":", from.port (), " created");
 		}
 		session->ProcessNextMessage (buf, bytes_transferred, from);
@@ -206,8 +209,10 @@ namespace transport
 				{
 					// otherwise create new session					
 					session = std::make_shared<SSUSession> (*this, remoteEndpoint, router, peerTest);
-					m_Sessions[remoteEndpoint] = session;
-					
+					{
+						std::unique_lock<std::mutex> l(m_SessionsMutex);
+						m_Sessions[remoteEndpoint] = session;
+					}
 					if (!router->UsesIntroducer ())
 					{
 						// connect directly						
@@ -243,6 +248,7 @@ namespace transport
 								introducer = &(address->introducers[0]); // TODO:
 								boost::asio::ip::udp::endpoint introducerEndpoint (introducer->iHost, introducer->iPort);
 								introducerSession = std::make_shared<SSUSession> (*this, introducerEndpoint, router);
+								std::unique_lock<std::mutex> l(m_SessionsMutex);
 								m_Sessions[introducerEndpoint] = introducerSession;													
 							}	
 							// introduce
@@ -256,6 +262,7 @@ namespace transport
 						else
 						{	
 							LogPrint (eLogWarning, "Can't connect to unreachable router. No introducers presented");
+							std::unique_lock<std::mutex> l(m_SessionsMutex);
 							m_Sessions.erase (remoteEndpoint);
 							session.reset ();
 						}	
@@ -273,12 +280,14 @@ namespace transport
 		if (session)
 		{
 			session->Close ();
+			std::unique_lock<std::mutex> l(m_SessionsMutex);	
 			m_Sessions.erase (session->GetRemoteEndpoint ());
 		}	
 	}	
 
 	void SSUServer::DeleteAllSessions ()
 	{
+		std::unique_lock<std::mutex> l(m_SessionsMutex);
 		for (auto it: m_Sessions)
 			it.second->Close ();
 		m_Sessions.clear ();
diff --git a/SSU.h b/SSU.h
index 057a42a2..a1511f51 100644
--- a/SSU.h
+++ b/SSU.h
@@ -7,6 +7,7 @@
 #include <list>
 #include <set>
 #include <thread>
+#include <mutex>
 #include <boost/asio.hpp>
 #include "aes.h"
 #include "I2PEndian.h"
@@ -75,6 +76,7 @@ namespace transport
 			std::list<boost::asio::ip::udp::endpoint> m_Introducers; // introducers we are connected to
 			i2p::crypto::AESAlignedBuffer<2*SSU_MTU_V4> m_ReceiveBuffer;
 			i2p::crypto::AESAlignedBuffer<2*SSU_MTU_V6> m_ReceiveBufferV6; 
+			std::mutex m_SessionsMutex;
 			std::map<boost::asio::ip::udp::endpoint, std::shared_ptr<SSUSession> > m_Sessions;
 			std::map<uint32_t, boost::asio::ip::udp::endpoint> m_Relays; // we are introducer
 
diff --git a/SSUSession.cpp b/SSUSession.cpp
index 1df785e6..4c7d08cd 100644
--- a/SSUSession.cpp
+++ b/SSUSession.cpp
@@ -16,7 +16,7 @@ namespace transport
 	SSUSession::SSUSession (SSUServer& server, boost::asio::ip::udp::endpoint& remoteEndpoint,
 		std::shared_ptr<const i2p::data::RouterInfo> router, bool peerTest ): TransportSession (router), 
 		m_Server (server), m_RemoteEndpoint (remoteEndpoint), 
-		m_Timer (m_Server.GetService ()), m_PeerTest (peerTest),
+		m_Timer (GetService ()), m_PeerTest (peerTest),
  		m_State (eSessionStateUnknown), m_IsSessionKey (false), m_RelayTag (0),
 		m_Data (*this), m_NumSentBytes (0), m_NumReceivedBytes (0)
 	{
@@ -26,6 +26,11 @@ namespace transport
 	SSUSession::~SSUSession ()
 	{		
 	}	
+
+	boost::asio::io_service& SSUSession::GetService () 
+	{ 
+		return IsV6 () ? m_Server.GetServiceV6 () : m_Server.GetService (); 
+	}
 	
 	void SSUSession::CreateAESandMacKey (const uint8_t * pubKey)
 	{
@@ -755,14 +760,15 @@ namespace transport
 
 	void SSUSession::Close ()
 	{
+		m_State = eSessionStateClosed;
 		SendSesionDestroyed ();
 		transports.PeerDisconnected (shared_from_this ());
+		m_Timer.cancel ();
 	}	
 
 	void SSUSession::Done ()
 	{
-		boost::asio::io_service& service = IsV6 () ? m_Server.GetServiceV6 () : m_Server.GetService ();
-		service.post (std::bind (&SSUSession::Failed, shared_from_this ()));
+		GetService ().post (std::bind (&SSUSession::Failed, shared_from_this ()));
 	}
 
 	void SSUSession::Established ()
@@ -824,8 +830,7 @@ namespace transport
 
 	void SSUSession::SendI2NPMessage (I2NPMessage * msg)
 	{
-		boost::asio::io_service& service = IsV6 () ? m_Server.GetServiceV6 () : m_Server.GetService ();
-		service.post (std::bind (&SSUSession::PostI2NPMessage, shared_from_this (), msg));    
+		GetService ().post (std::bind (&SSUSession::PostI2NPMessage, shared_from_this (), msg));    
 	}	
 
 	void SSUSession::PostI2NPMessage (I2NPMessage * msg)
@@ -836,8 +841,7 @@ namespace transport
 
 	void SSUSession::SendI2NPMessages (const std::vector<I2NPMessage *>& msgs)
 	{
-		boost::asio::io_service& service = IsV6 () ? m_Server.GetServiceV6 () : m_Server.GetService ();
-		service.post (std::bind (&SSUSession::PostI2NPMessages, shared_from_this (), msgs));    
+		GetService ().post (std::bind (&SSUSession::PostI2NPMessages, shared_from_this (), msgs));    
 	}
 
 	void SSUSession::PostI2NPMessages (std::vector<I2NPMessage *> msgs)
diff --git a/SSUSession.h b/SSUSession.h
index 2f323c3f..0ff1a9f1 100644
--- a/SSUSession.h
+++ b/SSUSession.h
@@ -45,6 +45,7 @@ namespace transport
 		eSessionStateUnknown,	
 		eSessionStateIntroduced,
 		eSessionStateEstablished,
+		eSessionStateClosed,
 		eSessionStateFailed
 	};	
 
@@ -80,6 +81,7 @@ namespace transport
 
 		private:
 
+			boost::asio::io_service& GetService ();
 			void CreateAESandMacKey (const uint8_t * pubKey); 
 
 			void PostI2NPMessage (I2NPMessage * msg);