Explicitly disconnect from remaining resources in destructors

Explicitly disconnect from remaining resources in the
ChainedConnected and ClientSessionStanzaChannel destructors, so
the event loop will not call the signal handler methods on a
freed object.

Test-Information:

Repeating the test case of creating a Swift::Client instance,
connecting it and then deleting it after a random time below one
second.

On Mac OS X 10.9.5 running this test case causes two ASAN
heap-use-after-free errors and with this patch the errors are
gone.

Change-Id: I3e48150c3633f4076ca9172aad9e85ba389df950

Swiften/Client/ClientSessionStanzaChannel.cpp

@@ -1,16 +1,27 @@
 /*
- * Copyright (c) 2010 Isode Limited.
+ * Copyright (c) 2010-2015 Isode Limited.
  * All rights reserved.
  * See the COPYING file for more information.
  */
 
 #include <Swiften/Client/ClientSessionStanzaChannel.h>
 
-#include <boost/bind.hpp>
 #include <iostream>
 
+#include <boost/bind.hpp>
+
 namespace Swift {
 
+ClientSessionStanzaChannel::~ClientSessionStanzaChannel() {
+	if (session) {
+		session->onFinished.disconnect(boost::bind(&ClientSessionStanzaChannel::handleSessionFinished, this, _1));
+		session->onStanzaReceived.disconnect(boost::bind(&ClientSessionStanzaChannel::handleStanza, this, _1));
+		session->onStanzaAcked.disconnect(boost::bind(&ClientSessionStanzaChannel::handleStanzaAcked, this, _1));
+		session->onInitialized.disconnect(boost::bind(&ClientSessionStanzaChannel::handleSessionInitialized, this));
+		session.reset();
+	}
+}
+
 void ClientSessionStanzaChannel::setSession(boost::shared_ptr<ClientSession> session) {
 	assert(!this->session);
 	this->session = session;

Swiften/Client/ClientSessionStanzaChannel.h

@@ -12,8 +12,8 @@
 #include <Swiften/Base/IDGenerator.h>
 #include <Swiften/Client/ClientSession.h>
 #include <Swiften/Client/StanzaChannel.h>
-#include <Swiften/Elements/Message.h>
 #include <Swiften/Elements/IQ.h>
+#include <Swiften/Elements/Message.h>
 #include <Swiften/Elements/Presence.h>
 
 namespace Swift {
@@ -22,6 +22,8 @@ namespace Swift {
 	 */
 	class SWIFTEN_API ClientSessionStanzaChannel : public StanzaChannel {
 		public:
+			virtual ~ClientSessionStanzaChannel();
+
 			void setSession(boost::shared_ptr<ClientSession> session);
 
 			void sendIQ(boost::shared_ptr<IQ> iq);

Swiften/Network/ChainedConnector.cpp

@@ -1,18 +1,19 @@
 /*
- * Copyright (c) 2011 Isode Limited.
+ * Copyright (c) 2011-2015 Isode Limited.
  * All rights reserved.
  * See the COPYING file for more information.
  */
 
 #include <Swiften/Network/ChainedConnector.h>
 
-#include <boost/bind.hpp>
 #include <typeinfo>
 
+#include <boost/bind.hpp>
+
 #include <Swiften/Base/Log.h>
 #include <Swiften/Base/foreach.h>
-#include <Swiften/Network/Connector.h>
 #include <Swiften/Network/ConnectionFactory.h>
+#include <Swiften/Network/Connector.h>
 
 using namespace Swift;
 
@@ -32,6 +33,14 @@ ChainedConnector::ChainedConnector(
 			timeoutMilliseconds(0) {
 }
 
+ChainedConnector::~ChainedConnector() {
+	if (currentConnector) {
+		currentConnector->onConnectFinished.disconnect(boost::bind(&ChainedConnector::handleConnectorFinished, this, _1, _2));
+		currentConnector->stop();
+		currentConnector.reset();
+	}
+}
+
 void ChainedConnector::setTimeoutMilliseconds(int milliseconds) {
 	timeoutMilliseconds = milliseconds;
 }

Swiften/Network/ChainedConnector.h

@@ -1,20 +1,21 @@
 /*
- * Copyright (c) 2011 Isode Limited.
+ * Copyright (c) 2011-2015 Isode Limited.
  * All rights reserved.
  * See the COPYING file for more information.
  */
 
 #pragma once
 
+#include <deque>
 #include <string>
 #include <vector>
-#include <deque>
-#include <boost/shared_ptr.hpp>
+
 #include <boost/optional.hpp>
+#include <boost/shared_ptr.hpp>
 
 #include <Swiften/Base/API.h>
-#include <Swiften/Base/boost_bsignals.h>
 #include <Swiften/Base/Error.h>
+#include <Swiften/Base/boost_bsignals.h>
 
 namespace Swift {
 	class Connection;
@@ -26,6 +27,7 @@ namespace Swift {
 	class SWIFTEN_API ChainedConnector {
 		public:
 			ChainedConnector(const std::string& hostname, int port, const boost::optional<std::string>& serviceLookupPrefix, DomainNameResolver*, const std::vector<ConnectionFactory*>&, TimerFactory*);
+			~ChainedConnector();
 
 			void setTimeoutMilliseconds(int milliseconds);
 			void start();