6 files changed, 274 insertions, 123 deletions
diff --git a/Swiften/Client/ClientOptions.h b/Swiften/Client/ClientOptions.h
index 3a93197..1a337b6 100644
--- a/Swiften/Client/ClientOptions.h
+++ b/Swiften/Client/ClientOptions.h
@@ -30,21 +30,7 @@ namespace Swift {
             HTTPConnectProxy
         };
 
-        ClientOptions() :
-                useStreamCompression(true),
-                useTLS(UseTLSWhenAvailable),
-                allowPLAINWithoutTLS(false),
-                useStreamResumption(false),
-                forgetPassword(false),
-                useAcks(true),
-                singleSignOn(false),
-                manualHostname(""),
-                manualPort(-1),
-                proxyType(SystemConfiguredProxy),
-                manualProxyHostname(""),
-                manualProxyPort(-1),
-                boshHTTPConnectProxyAuthID(""),
-                boshHTTPConnectProxyAuthPassword("") {
+        ClientOptions() {
         }
 
         /**
@@ -52,14 +38,14 @@ namespace Swift {
          *
          * Default: true
          */
-        bool useStreamCompression;
+        bool useStreamCompression = true;
 
         /**
          * Sets whether TLS encryption should be used.
          *
          * Default: UseTLSWhenAvailable
          */
-        UseTLS useTLS;
+        UseTLS useTLS = UseTLSWhenAvailable;
 
         /**
          * Sets whether plaintext authentication is
@@ -67,14 +53,14 @@ namespace Swift {
          *
          * Default: false
          */
-        bool allowPLAINWithoutTLS;
+        bool allowPLAINWithoutTLS = false;
 
         /**
          * Use XEP-196 stream resumption when available.
          *
          * Default: false
          */
-        bool useStreamResumption;
+        bool useStreamResumption = false;
 
         /**
          * Forget the password once it's used.
@@ -84,69 +70,69 @@ namespace Swift {
          *
          * Default: false
          */
-        bool forgetPassword;
+        bool forgetPassword = false;
 
         /**
          * Use XEP-0198 acks in the stream when available.
          * Default: true
          */
-        bool useAcks;
+        bool useAcks = true;
 
         /**
          * Use Single Sign On.
          * Default: false
          */
-        bool singleSignOn;
+        bool singleSignOn = false;
 
         /**
          * The hostname to connect to.
          * Leave this empty for standard XMPP connection, based on the JID domain.
          */
-        std::string manualHostname;
+        std::string manualHostname = "";
 
         /**
          * The port to connect to.
          * Leave this to -1 to use the port discovered by SRV lookups, and 5222 as a
          * fallback.
          */
-        int manualPort;
+        int manualPort = -1;
 
         /**
          * The type of proxy to use for connecting to the XMPP
          * server.
          */
-        ProxyType proxyType;
+        ProxyType proxyType = SystemConfiguredProxy;
 
         /**
          * Override the system-configured proxy hostname.
          */
-        std::string manualProxyHostname;
+        std::string manualProxyHostname = "";
 
         /**
          * Override the system-configured proxy port.
          */
-        int manualProxyPort;
+        int manualProxyPort = -1;
 
         /**
          * If non-empty, use BOSH instead of direct TCP, with the given URL.
          * Default: empty (no BOSH)
          */
-        URL boshURL;
+        URL boshURL = URL();
 
         /**
          * If non-empty, BOSH connections will try to connect over this HTTP CONNECT
          * proxy instead of directly.
          * Default: empty (no proxy)
          */
-        URL boshHTTPConnectProxyURL;
+        URL boshHTTPConnectProxyURL = URL();
 
         /**
          * If this and matching Password are non-empty, BOSH connections over
          * HTTP CONNECT proxies will use these credentials for proxy access.
          * Default: empty (no authentication needed by the proxy)
          */
-        SafeString boshHTTPConnectProxyAuthID;
-        SafeString boshHTTPConnectProxyAuthPassword;
+        SafeString boshHTTPConnectProxyAuthID = SafeString("");
+        SafeString boshHTTPConnectProxyAuthPassword = SafeString("");
 
         /**
          * This can be initialized with a custom HTTPTrafficFilter, which allows HTTP CONNECT
@@ -158,5 +144,11 @@ namespace Swift {
          * Options passed to the TLS stack
          */
         TLSOptions tlsOptions;
+
+        /**
+         * Session shutdown timeout in milliseconds. This is the maximum time Swiften
+         * waits from a session close to the socket close.
+         */
+        int sessionShutdownTimeoutInMilliseconds = 10000;
     };
 }
diff --git a/Swiften/Client/ClientSession.cpp b/Swiften/Client/ClientSession.cpp
index c301881..bcfb004 100644
--- a/Swiften/Client/ClientSession.cpp
+++ b/Swiften/Client/ClientSession.cpp
@@ -6,42 +6,47 @@
 
 #include <Swiften/Client/ClientSession.h>
 
+#include <memory>
+
 #include <boost/bind.hpp>
 #include <boost/uuid/uuid.hpp>
 #include <boost/uuid/uuid_io.hpp>
 #include <boost/uuid/uuid_generators.hpp>
-#include <memory>
 
-#include <Swiften/Base/Platform.h>
 #include <Swiften/Base/Log.h>
-#include <Swiften/Elements/ProtocolHeader.h>
-#include <Swiften/Elements/StreamFeatures.h>
-#include <Swiften/Elements/StreamError.h>
-#include <Swiften/Elements/StartTLSRequest.h>
-#include <Swiften/Elements/StartTLSFailure.h>
-#include <Swiften/Elements/TLSProceed.h>
-#include <Swiften/Elements/AuthRequest.h>
-#include <Swiften/Elements/AuthSuccess.h>
-#include <Swiften/Elements/AuthFailure.h>
+#include <Swiften/Base/Platform.h>
+#include <Swiften/Crypto/CryptoProvider.h>
 #include <Swiften/Elements/AuthChallenge.h>
+#include <Swiften/Elements/AuthFailure.h>
+#include <Swiften/Elements/AuthRequest.h>
 #include <Swiften/Elements/AuthResponse.h>
-#include <Swiften/Elements/Compressed.h>
+#include <Swiften/Elements/AuthSuccess.h>
 #include <Swiften/Elements/CompressFailure.h>
 #include <Swiften/Elements/CompressRequest.h>
+#include <Swiften/Elements/Compressed.h>
 #include <Swiften/Elements/EnableStreamManagement.h>
-#include <Swiften/Elements/StreamManagementEnabled.h>
-#include <Swiften/Elements/StreamManagementFailed.h>
-#include <Swiften/Elements/StartSession.h>
-#include <Swiften/Elements/StanzaAck.h>
-#include <Swiften/Elements/StanzaAckRequest.h>
 #include <Swiften/Elements/IQ.h>
+#include <Swiften/Elements/ProtocolHeader.h>
 #include <Swiften/Elements/ResourceBind.h>
-#include <Swiften/SASL/PLAINClientAuthenticator.h>
+#include <Swiften/Elements/StanzaAck.h>
+#include <Swiften/Elements/StanzaAckRequest.h>
+#include <Swiften/Elements/StartSession.h>
+#include <Swiften/Elements/StartTLSFailure.h>
+#include <Swiften/Elements/StartTLSRequest.h>
+#include <Swiften/Elements/StreamError.h>
+#include <Swiften/Elements/StreamFeatures.h>
+#include <Swiften/Elements/StreamManagementEnabled.h>
+#include <Swiften/Elements/StreamManagementFailed.h>
+#include <Swiften/Elements/TLSProceed.h>
+#include <Swiften/Network/Timer.h>
+#include <Swiften/Network/TimerFactory.h>
+#include <Swiften/SASL/DIGESTMD5ClientAuthenticator.h>
 #include <Swiften/SASL/EXTERNALClientAuthenticator.h>
+#include <Swiften/SASL/PLAINClientAuthenticator.h>
 #include <Swiften/SASL/SCRAMSHA1ClientAuthenticator.h>
-#include <Swiften/SASL/DIGESTMD5ClientAuthenticator.h>
-#include <Swiften/Crypto/CryptoProvider.h>
 #include <Swiften/Session/SessionStream.h>
+#include <Swiften/StreamManagement/StanzaAckRequester.h>
+#include <Swiften/StreamManagement/StanzaAckResponder.h>
 #include <Swiften/TLS/CertificateTrustChecker.h>
 #include <Swiften/TLS/ServerIdentityVerifier.h>
 
@@ -59,12 +64,14 @@ ClientSession::ClientSession(
         const JID& jid,
         std::shared_ptr<SessionStream> stream,
         IDNConverter* idnConverter,
-        CryptoProvider* crypto) :
+        CryptoProvider* crypto,
+        TimerFactory* timerFactory) :
             localJID(jid),
-            state(Initial),
+            state(State::Initial),
             stream(stream),
             idnConverter(idnConverter),
             crypto(crypto),
+            timerFactory(timerFactory),
             allowPLAINOverNonTLS(false),
             useStreamCompression(true),
             useTLS(UseTLSWhenAvailable),
@@ -89,12 +96,13 @@ ClientSession::~ClientSession() {
 
 void ClientSession::start() {
     stream->onStreamStartReceived.connect(boost::bind(&ClientSession::handleStreamStart, shared_from_this(), _1));
+    stream->onStreamEndReceived.connect(boost::bind(&ClientSession::handleStreamEnd, shared_from_this()));
     stream->onElementReceived.connect(boost::bind(&ClientSession::handleElement, shared_from_this(), _1));
     stream->onClosed.connect(boost::bind(&ClientSession::handleStreamClosed, shared_from_this(), _1));
     stream->onTLSEncrypted.connect(boost::bind(&ClientSession::handleTLSEncrypted, shared_from_this()));
 
-    assert(state == Initial);
-    state = WaitingForStreamStart;
+    assert(state == State::Initial);
+    state = State::WaitingForStreamStart;
     sendStreamHeader();
 }
 
@@ -112,8 +120,19 @@ void ClientSession::sendStanza(std::shared_ptr<Stanza> stanza) {
 }
 
 void ClientSession::handleStreamStart(const ProtocolHeader&) {
-    CHECK_STATE_OR_RETURN(WaitingForStreamStart);
-    state = Negotiating;
+    CHECK_STATE_OR_RETURN(State::WaitingForStreamStart);
+    state = State::Negotiating;
+}
+
+void ClientSession::handleStreamEnd() {
+    if (state == State::Finishing) {
+        // We are already in finishing state if we iniated the close of the session.
+        stream->close();
+    }
+    else {
+        state = State::Finishing;
+        initiateShutdown(true);
+    }
 }
 
 void ClientSession::handleElement(std::shared_ptr<ToplevelElement> element) {
@@ -121,11 +140,11 @@ void ClientSession::handleElement(std::shared_ptr<ToplevelElement> element) {
         if (stanzaAckResponder_) {
             stanzaAckResponder_->handleStanzaReceived();
         }
-        if (getState() == Initialized) {
+        if (getState() == State::Initialized) {
             onStanzaReceived(stanza);
         }
         else if (std::shared_ptr<IQ> iq = std::dynamic_pointer_cast<IQ>(element)) {
-            if (state == BindingResource) {
+            if (state == State::BindingResource) {
                 std::shared_ptr<ResourceBind> resourceBind(iq->getPayload<ResourceBind>());
                 if (iq->getType() == IQ::Error && iq->getID() == "session-bind") {
                     finishSession(Error::ResourceBindError);
@@ -145,7 +164,7 @@ void ClientSession::handleElement(std::shared_ptr<ToplevelElement> element) {
                     finishSession(Error::UnexpectedElementError);
                 }
             }
-            else if (state == StartingSession) {
+            else if (state == State::StartingSession) {
                 if (iq->getType() == IQ::Result) {
                     needSessionStart = false;
                     continueSessionInitialization();
@@ -183,7 +202,7 @@ void ClientSession::handleElement(std::shared_ptr<ToplevelElement> element) {
     else if (StreamError::ref streamError = std::dynamic_pointer_cast<StreamError>(element)) {
         finishSession(Error::StreamError);
     }
-    else if (getState() == Initialized) {
+    else if (getState() == State::Initialized) {
         std::shared_ptr<Stanza> stanza = std::dynamic_pointer_cast<Stanza>(element);
         if (stanza) {
             if (stanzaAckResponder_) {
@@ -193,17 +212,17 @@ void ClientSession::handleElement(std::shared_ptr<ToplevelElement> element) {
         }
     }
     else if (StreamFeatures* streamFeatures = dynamic_cast<StreamFeatures*>(element.get())) {
-        CHECK_STATE_OR_RETURN(Negotiating);
+        CHECK_STATE_OR_RETURN(State::Negotiating);
 
         if (streamFeatures->hasStartTLS() && stream->supportsTLSEncryption() && useTLS != NeverUseTLS) {
-            state = WaitingForEncrypt;
+            state = State::WaitingForEncrypt;
             stream->writeElement(std::make_shared<StartTLSRequest>());
         }
         else if (useTLS == RequireTLS && !stream->isTLSEncrypted()) {
             finishSession(Error::NoSupportedAuthMechanismsError);
         }
         else if (useStreamCompression && stream->supportsZLibCompression() && streamFeatures->hasCompressionMethod("zlib")) {
-            state = Compressing;
+            state = State::Compressing;
             stream->writeElement(std::make_shared<CompressRequest>("zlib"));
         }
         else if (streamFeatures->hasAuthenticationMechanisms()) {
@@ -222,7 +241,7 @@ void ClientSession::handleElement(std::shared_ptr<ToplevelElement> element) {
                     authenticator = gssapiAuthenticator;
 
                     if (!gssapiAuthenticator->isError()) {
-                        state = Authenticating;
+                        state = State::Authenticating;
                         stream->writeElement(std::make_shared<AuthRequest>(authenticator->getName(), authenticator->getResponse()));
                     }
                     else {
@@ -236,7 +255,7 @@ void ClientSession::handleElement(std::shared_ptr<ToplevelElement> element) {
             if (stream->hasTLSCertificate()) {
                 if (streamFeatures->hasAuthenticationMechanism("EXTERNAL")) {
                     authenticator = new EXTERNALClientAuthenticator();
-                    state = Authenticating;
+                    state = State::Authenticating;
                     stream->writeElement(std::make_shared<AuthRequest>("EXTERNAL", createSafeByteArray("")));
                 }
                 else {
@@ -245,7 +264,7 @@ void ClientSession::handleElement(std::shared_ptr<ToplevelElement> element) {
             }
             else if (streamFeatures->hasAuthenticationMechanism("EXTERNAL")) {
                 authenticator = new EXTERNALClientAuthenticator();
-                state = Authenticating;
+                state = State::Authenticating;
                 stream->writeElement(std::make_shared<AuthRequest>("EXTERNAL", createSafeByteArray("")));
             }
             else if (streamFeatures->hasAuthenticationMechanism("SCRAM-SHA-1") || streamFeatures->hasAuthenticationMechanism("SCRAM-SHA-1-PLUS")) {
@@ -262,12 +281,12 @@ void ClientSession::handleElement(std::shared_ptr<ToplevelElement> element) {
                     scramAuthenticator->setTLSChannelBindingData(finishMessage);
                 }
                 authenticator = scramAuthenticator;
-                state = WaitingForCredentials;
+                state = State::WaitingForCredentials;
                 onNeedCredentials();
             }
             else if ((stream->isTLSEncrypted() || allowPLAINOverNonTLS) && streamFeatures->hasAuthenticationMechanism("PLAIN")) {
                 authenticator = new PLAINClientAuthenticator();
-                state = WaitingForCredentials;
+                state = State::WaitingForCredentials;
                 onNeedCredentials();
             }
             else if (streamFeatures->hasAuthenticationMechanism("DIGEST-MD5") && crypto->isMD5AllowedForCrypto()) {
@@ -275,7 +294,7 @@ void ClientSession::handleElement(std::shared_ptr<ToplevelElement> element) {
                 s << boost::uuids::random_generator()();
                 // FIXME: Host should probably be the actual host
                 authenticator = new DIGESTMD5ClientAuthenticator(localJID.getDomain(), s.str(), crypto);
-                state = WaitingForCredentials;
+                state = State::WaitingForCredentials;
                 onNeedCredentials();
             }
             else {
@@ -299,8 +318,8 @@ void ClientSession::handleElement(std::shared_ptr<ToplevelElement> element) {
         }
     }
     else if (std::dynamic_pointer_cast<Compressed>(element)) {
-        CHECK_STATE_OR_RETURN(Compressing);
-        state = WaitingForStreamStart;
+        CHECK_STATE_OR_RETURN(State::Compressing);
+        state = State::WaitingForStreamStart;
         stream->addZLibCompression();
         stream->resetXMPPParser();
         sendStreamHeader();
@@ -322,7 +341,7 @@ void ClientSession::handleElement(std::shared_ptr<ToplevelElement> element) {
         continueSessionInitialization();
     }
     else if (AuthChallenge* challenge = dynamic_cast<AuthChallenge*>(element.get())) {
-        CHECK_STATE_OR_RETURN(Authenticating);
+        CHECK_STATE_OR_RETURN(State::Authenticating);
         assert(authenticator);
         if (authenticator->setChallenge(challenge->getValue())) {
             stream->writeElement(std::make_shared<AuthResponse>(authenticator->getResponse()));
@@ -340,13 +359,13 @@ void ClientSession::handleElement(std::shared_ptr<ToplevelElement> element) {
         }
     }
     else if (AuthSuccess* authSuccess = dynamic_cast<AuthSuccess*>(element.get())) {
-        CHECK_STATE_OR_RETURN(Authenticating);
+        CHECK_STATE_OR_RETURN(State::Authenticating);
         assert(authenticator);
         if (!authenticator->setChallenge(authSuccess->getValue())) {
             finishSession(Error::ServerVerificationFailedError);
         }
         else {
-            state = WaitingForStreamStart;
+            state = State::WaitingForStreamStart;
             delete authenticator;
             authenticator = nullptr;
             stream->resetXMPPParser();
@@ -357,8 +376,8 @@ void ClientSession::handleElement(std::shared_ptr<ToplevelElement> element) {
         finishSession(Error::AuthenticationFailedError);
     }
     else if (dynamic_cast<TLSProceed*>(element.get())) {
-        CHECK_STATE_OR_RETURN(WaitingForEncrypt);
-        state = Encrypting;
+        CHECK_STATE_OR_RETURN(State::WaitingForEncrypt);
+        state = State::Encrypting;
         stream->addTLSEncryption();
     }
     else if (dynamic_cast<StartTLSFailure*>(element.get())) {
@@ -366,14 +385,14 @@ void ClientSession::handleElement(std::shared_ptr<ToplevelElement> element) {
     }
     else {
         // FIXME Not correct?
-        state = Initialized;
+        state = State::Initialized;
         onInitialized();
     }
 }
 
 void ClientSession::continueSessionInitialization() {
     if (needResourceBind) {
-        state = BindingResource;
+        state = State::BindingResource;
         std::shared_ptr<ResourceBind> resourceBind(std::make_shared<ResourceBind>());
         if (!localJID.getResource().empty()) {
             resourceBind->setResource(localJID.getResource());
@@ -381,15 +400,15 @@ void ClientSession::continueSessionInitialization() {
         sendStanza(IQ::createRequest(IQ::Set, JID(), "session-bind", resourceBind));
     }
     else if (needAcking) {
-        state = EnablingSessionManagement;
+        state = State::EnablingSessionManagement;
         stream->writeElement(std::make_shared<EnableStreamManagement>());
     }
     else if (needSessionStart) {
-        state = StartingSession;
+        state = State::StartingSession;
         sendStanza(IQ::createRequest(IQ::Set, JID(), "session-start", std::make_shared<StartSession>()));
     }
     else {
-        state = Initialized;
+        state = State::Initialized;
         onInitialized();
     }
 }
@@ -403,15 +422,15 @@ bool ClientSession::checkState(State state) {
 }
 
 void ClientSession::sendCredentials(const SafeByteArray& password) {
-    assert(WaitingForCredentials);
+    assert(state == State::WaitingForCredentials);
     assert(authenticator);
-    state = Authenticating;
+    state = State::Authenticating;
     authenticator->setCredentials(localJID.getNode(), password);
     stream->writeElement(std::make_shared<AuthRequest>(authenticator->getName(), authenticator->getResponse()));
 }
 
 void ClientSession::handleTLSEncrypted() {
-    CHECK_STATE_OR_RETURN(Encrypting);
+    CHECK_STATE_OR_RETURN(State::Encrypting);
 
     std::vector<Certificate::ref> certificateChain = stream->getPeerCertificateChain();
     std::shared_ptr<CertificateVerificationError> verificationError = stream->getPeerCertificateVerificationError();
@@ -438,15 +457,38 @@ void ClientSession::checkTrustOrFinish(const std::vector<Certificate::ref>& cert
     }
 }
 
+void ClientSession::initiateShutdown(bool sendFooter) {
+    if (!streamShutdownTimeout) {
+        streamShutdownTimeout = timerFactory->createTimer(sessionShutdownTimeoutInMilliseconds);
+        streamShutdownTimeout->onTick.connect(boost::bind(&ClientSession::handleStreamShutdownTimeout, shared_from_this()));
+        streamShutdownTimeout->start();
+    }
+    if (sendFooter) {
+        stream->writeFooter();
+    }
+    if (state == State::Finishing) {
+        // The other side already send </stream>; we can close the socket.
+        stream->close();
+    }
+    else {
+        state = State::Finishing;
+    }
+}
+
 void ClientSession::continueAfterTLSEncrypted() {
-    state = WaitingForStreamStart;
+    state = State::WaitingForStreamStart;
     stream->resetXMPPParser();
     sendStreamHeader();
 }
 
 void ClientSession::handleStreamClosed(std::shared_ptr<Swift::Error> streamError) {
     State previousState = state;
-    state = Finished;
+    state = State::Finished;
+
+    if (streamShutdownTimeout) {
+        streamShutdownTimeout->stop();
+        streamShutdownTimeout.reset();
+    }
 
     if (stanzaAckRequester_) {
         stanzaAckRequester_->onRequestAck.disconnect(boost::bind(&ClientSession::requestAck, shared_from_this()));
@@ -459,11 +501,12 @@ void ClientSession::handleStreamClosed(std::shared_ptr<Swift::Error> streamError
     }
     stream->setWhitespacePingEnabled(false);
     stream->onStreamStartReceived.disconnect(boost::bind(&ClientSession::handleStreamStart, shared_from_this(), _1));
+    stream->onStreamEndReceived.disconnect(boost::bind(&ClientSession::handleStreamEnd, shared_from_this()));
     stream->onElementReceived.disconnect(boost::bind(&ClientSession::handleElement, shared_from_this(), _1));
     stream->onClosed.disconnect(boost::bind(&ClientSession::handleStreamClosed, shared_from_this(), _1));
     stream->onTLSEncrypted.disconnect(boost::bind(&ClientSession::handleTLSEncrypted, shared_from_this()));
 
-    if (previousState == Finishing) {
+    if (previousState == State::Finishing) {
         onFinished(error_);
     }
     else {
@@ -471,8 +514,17 @@ void ClientSession::handleStreamClosed(std::shared_ptr<Swift::Error> streamError
     }
 }
 
+void ClientSession::handleStreamShutdownTimeout() {
+    handleStreamClosed(std::shared_ptr<Swift::Error>());
+}
+
 void ClientSession::finish() {
-    finishSession(std::shared_ptr<Error>());
+    if (state != State::Finishing && state != State::Finished) {
+        finishSession(std::shared_ptr<Error>());
+    }
+    else {
+        SWIFT_LOG(warning) << "Session already finished or finishing." << std::endl;
+    }
 }
 
 void ClientSession::finishSession(Error::Type error) {
@@ -480,7 +532,6 @@ void ClientSession::finishSession(Error::Type error) {
 }
 
 void ClientSession::finishSession(std::shared_ptr<Swift::Error> error) {
-    state = Finishing;
     if (!error_) {
         error_ = error;
     }
@@ -495,8 +546,19 @@ void ClientSession::finishSession(std::shared_ptr<Swift::Error> error) {
         delete authenticator;
         authenticator = nullptr;
     }
-    stream->writeFooter();
-    stream->close();
+    // Immidiately close TCP connection without stream closure.
+    if (std::dynamic_pointer_cast<CertificateVerificationError>(error)) {
+        state = State::Finishing;
+        initiateShutdown(false);
+    }
+    else {
+        if (state == State::Finishing) {
+            initiateShutdown(true);
+        }
+        else if (state != State::Finished) {
+            initiateShutdown(true);
+        }
+    }
 }
 
 void ClientSession::requestAck() {
diff --git a/Swiften/Client/ClientSession.h b/Swiften/Client/ClientSession.h
index ad1b78c..c7b3658 100644
--- a/Swiften/Client/ClientSession.h
+++ b/Swiften/Client/ClientSession.h
@@ -16,18 +16,21 @@
 #include <Swiften/Elements/ToplevelElement.h>
 #include <Swiften/JID/JID.h>
 #include <Swiften/Session/SessionStream.h>
-#include <Swiften/StreamManagement/StanzaAckRequester.h>
-#include <Swiften/StreamManagement/StanzaAckResponder.h>
 
 namespace Swift {
-    class ClientAuthenticator;
     class CertificateTrustChecker;
-    class IDNConverter;
+    class ClientAuthenticator;
     class CryptoProvider;
+    class IDNConverter;
+    class Stanza;
+    class StanzaAckRequester;
+    class StanzaAckResponder;
+    class TimerFactory;
+    class Timer;
 
     class SWIFTEN_API ClientSession : public std::enable_shared_from_this<ClientSession> {
         public:
-            enum State {
+            enum class State {
                 Initial,
                 WaitingForStreamStart,
                 Negotiating,
@@ -55,7 +58,8 @@ namespace Swift {
                     SessionStartError,
                     TLSClientCertificateError,
                     TLSError,
-                    StreamError
+                    StreamError,
+                    StreamEndError, // The server send a closing stream tag.
                 } type;
                 std::shared_ptr<boost::system::error_code> errorCode;
                 Error(Type type) : type(type) {}
@@ -69,8 +73,8 @@ namespace Swift {
 
             ~ClientSession();
 
-            static std::shared_ptr<ClientSession> create(const JID& jid, std::shared_ptr<SessionStream> stream, IDNConverter* idnConverter, CryptoProvider* crypto) {
-                return std::shared_ptr<ClientSession>(new ClientSession(jid, stream, idnConverter, crypto));
+            static std::shared_ptr<ClientSession> create(const JID& jid, std::shared_ptr<SessionStream> stream, IDNConverter* idnConverter, CryptoProvider* crypto, TimerFactory* timerFactory) {
+                return std::shared_ptr<ClientSession>(new ClientSession(jid, stream, idnConverter, crypto, timerFactory));
             }
 
             State getState() const {
@@ -93,7 +97,6 @@ namespace Swift {
                 useAcks = b;
             }
 
-
             bool getStreamManagementEnabled() const {
                 // Explicitly convert to bool. In C++11, it would be cleaner to
                 // compare to nullptr.
@@ -116,7 +119,7 @@ namespace Swift {
             void finish();
 
             bool isFinished() const {
-                return getState() == Finished;
+                return getState() == State::Finished;
             }
 
             void sendCredentials(const SafeByteArray& password);
@@ -138,6 +141,10 @@ namespace Swift {
                 authenticationPort = i;
             }
 
+            void setSessionShutdownTimeout(int timeoutInMilliseconds) {
+                sessionShutdownTimeoutInMilliseconds = timeoutInMilliseconds;
+            }
+
         public:
             boost::signals2::signal<void ()> onNeedCredentials;
             boost::signals2::signal<void ()> onInitialized;
@@ -150,7 +157,8 @@ namespace Swift {
                     const JID& jid,
                     std::shared_ptr<SessionStream>,
                     IDNConverter* idnConverter,
-                    CryptoProvider* crypto);
+                    CryptoProvider* crypto,
+                    TimerFactory* timerFactory);
 
             void finishSession(Error::Type error);
             void finishSession(std::shared_ptr<Swift::Error> error);
@@ -163,7 +171,9 @@ namespace Swift {
 
             void handleElement(std::shared_ptr<ToplevelElement>);
             void handleStreamStart(const ProtocolHeader&);
+            void handleStreamEnd();
             void handleStreamClosed(std::shared_ptr<Swift::Error>);
+            void handleStreamShutdownTimeout();
 
             void handleTLSEncrypted();
 
@@ -175,13 +185,17 @@ namespace Swift {
             void ack(unsigned int handledStanzasCount);
             void continueAfterTLSEncrypted();
             void checkTrustOrFinish(const std::vector<Certificate::ref>& certificateChain, std::shared_ptr<CertificateVerificationError> error);
+            void initiateShutdown(bool sendFooter);
 
         private:
             JID localJID;
             State state;
             std::shared_ptr<SessionStream> stream;
-            IDNConverter* idnConverter;
-            CryptoProvider* crypto;
+            IDNConverter* idnConverter = nullptr;
+            CryptoProvider* crypto = nullptr;
+            TimerFactory* timerFactory = nullptr;
+            std::shared_ptr<Timer> streamShutdownTimeout;
+            int sessionShutdownTimeoutInMilliseconds = 10000;
             bool allowPLAINOverNonTLS;
             bool useStreamCompression;
             UseTLS useTLS;
diff --git a/Swiften/Client/ClientSessionStanzaChannel.h b/Swiften/Client/ClientSessionStanzaChannel.h
index 0527a5c..c4ee393 100644
--- a/Swiften/Client/ClientSessionStanzaChannel.h
+++ b/Swiften/Client/ClientSessionStanzaChannel.h
@@ -33,7 +33,7 @@ namespace Swift {
             virtual std::vector<Certificate::ref> getPeerCertificateChain() const;
 
             bool isAvailable() const {
-                return session && session->getState() == ClientSession::Initialized;
+                return session && session->getState() == ClientSession::State::Initialized;
             }
 
         private:
diff --git a/Swiften/Client/CoreClient.cpp b/Swiften/Client/CoreClient.cpp
index 3d75d8b..3c7902e 100644
--- a/Swiften/Client/CoreClient.cpp
+++ b/Swiften/Client/CoreClient.cpp
@@ -154,12 +154,13 @@ void CoreClient::connect(const ClientOptions& o) {
 }
 
 void CoreClient::bindSessionToStream() {
-    session_ = ClientSession::create(jid_, sessionStream_, networkFactories->getIDNConverter(), networkFactories->getCryptoProvider());
+    session_ = ClientSession::create(jid_, sessionStream_, networkFactories->getIDNConverter(), networkFactories->getCryptoProvider(), networkFactories->getTimerFactory());
     session_->setCertificateTrustChecker(certificateTrustChecker);
     session_->setUseStreamCompression(options.useStreamCompression);
     session_->setAllowPLAINOverNonTLS(options.allowPLAINWithoutTLS);
     session_->setSingleSignOn(options.singleSignOn);
     session_->setAuthenticationPort(options.manualPort);
+    session_->setSessionShutdownTimeout(options.sessionShutdownTimeoutInMilliseconds);
     switch(options.useTLS) {
         case ClientOptions::UseTLSWhenAvailable:
             session_->setUseTLS(ClientSession::UseTLSWhenAvailable);
@@ -273,6 +274,9 @@ void CoreClient::handleSessionFinished(std::shared_ptr<Error> error) {
                 case ClientSession::Error::StreamError:
                     clientError = ClientError(ClientError::StreamError);
                     break;
+                case ClientSession::Error::StreamEndError:
+                    clientError = ClientError(ClientError::StreamError);
+                    break;
             }
             clientError.setErrorCode(actualError->errorCode);
         }
diff --git a/Swiften/Client/UnitTest/ClientSessionTest.cpp b/Swiften/Client/UnitTest/ClientSessionTest.cpp
index bd93f4b..44df961 100644
--- a/Swiften/Client/UnitTest/ClientSessionTest.cpp
+++ b/Swiften/Client/UnitTest/ClientSessionTest.cpp
@@ -10,6 +10,8 @@
 #include <boost/bind.hpp>
 #include <boost/optional.hpp>
 
+#include <Swiften/Base/Debug.h>
+
 #include <cppunit/extensions/HelperMacros.h>
 #include <cppunit/extensions/TestFactoryRegistry.h>
 
@@ -34,6 +36,7 @@
 #include <Swiften/Elements/TLSProceed.h>
 #include <Swiften/IDN/IDNConverter.h>
 #include <Swiften/IDN/PlatformIDNConverter.h>
+#include <Swiften/Network/DummyTimerFactory.h>
 #include <Swiften/Session/SessionStream.h>
 #include <Swiften/TLS/BlindCertificateTrustChecker.h>
 #include <Swiften/TLS/SimpleCertificate.h>
@@ -59,6 +62,11 @@ class ClientSessionTest : public CppUnit::TestFixture {
         CPPUNIT_TEST(testStreamManagement_Failed);
         CPPUNIT_TEST(testUnexpectedChallenge);
         CPPUNIT_TEST(testFinishAcksStanzas);
+
+        CPPUNIT_TEST(testServerInitiatedSessionClose);
+        CPPUNIT_TEST(testClientInitiatedSessionClose);
+        CPPUNIT_TEST(testTimeoutOnShutdown);
+
         /*
         CPPUNIT_TEST(testResourceBind);
         CPPUNIT_TEST(testResourceBind_ChangeResource);
@@ -77,6 +85,7 @@ class ClientSessionTest : public CppUnit::TestFixture {
         void setUp() {
             crypto = std::shared_ptr<CryptoProvider>(PlatformCryptoProvider::create());
             idnConverter = std::shared_ptr<IDNConverter>(PlatformIDNConverter::create());
+            timerFactory = std::make_shared<DummyTimerFactory>();
             server = std::make_shared<MockSessionStream>();
             sessionFinishedReceived = false;
             needCredentials = false;
@@ -92,7 +101,7 @@ class ClientSessionTest : public CppUnit::TestFixture {
             session->start();
             server->breakConnection();
 
-            CPPUNIT_ASSERT_EQUAL(ClientSession::Finished, session->getState());
+            CPPUNIT_ASSERT_EQUAL(ClientSession::State::Finished, session->getState());
             CPPUNIT_ASSERT(sessionFinishedReceived);
             CPPUNIT_ASSERT(sessionFinishedError);
         }
@@ -103,7 +112,11 @@ class ClientSessionTest : public CppUnit::TestFixture {
             server->sendStreamStart();
             server->sendStreamError();
 
-            CPPUNIT_ASSERT_EQUAL(ClientSession::Finished, session->getState());
+            CPPUNIT_ASSERT_EQUAL(ClientSession::State::Finishing, session->getState());
+            CPPUNIT_ASSERT_EQUAL(true, server->receivedEvents.back().footer);
+
+            server->onStreamEndReceived();
+            CPPUNIT_ASSERT_EQUAL(ClientSession::State::Finished, session->getState());
             CPPUNIT_ASSERT(sessionFinishedReceived);
             CPPUNIT_ASSERT(sessionFinishedError);
         }
@@ -136,7 +149,11 @@ class ClientSessionTest : public CppUnit::TestFixture {
             server->sendTLSFailure();
 
             CPPUNIT_ASSERT(!server->tlsEncrypted);
-            CPPUNIT_ASSERT_EQUAL(ClientSession::Finished, session->getState());
+            CPPUNIT_ASSERT_EQUAL(ClientSession::State::Finishing, session->getState());
+            CPPUNIT_ASSERT_EQUAL(true, server->receivedEvents.back().footer);
+
+            server->onStreamEndReceived();
+            CPPUNIT_ASSERT_EQUAL(ClientSession::State::Finished, session->getState());
             CPPUNIT_ASSERT(sessionFinishedReceived);
             CPPUNIT_ASSERT(sessionFinishedError);
         }
@@ -151,7 +168,7 @@ class ClientSessionTest : public CppUnit::TestFixture {
             server->sendTLSProceed();
             server->breakTLS();
 
-            CPPUNIT_ASSERT_EQUAL(ClientSession::Finished, session->getState());
+            CPPUNIT_ASSERT_EQUAL(ClientSession::State::Finished, session->getState());
             CPPUNIT_ASSERT(sessionFinishedReceived);
             CPPUNIT_ASSERT(sessionFinishedError);
         }
@@ -167,10 +184,12 @@ class ClientSessionTest : public CppUnit::TestFixture {
             server->sendTLSProceed();
             CPPUNIT_ASSERT(server->tlsEncrypted);
             server->onTLSEncrypted();
+            server->close();
+            CPPUNIT_ASSERT_EQUAL(ClientSession::State::Finished, session->getState());
 
-            CPPUNIT_ASSERT_EQUAL(ClientSession::Finished, session->getState());
             CPPUNIT_ASSERT(sessionFinishedReceived);
             CPPUNIT_ASSERT(sessionFinishedError);
+            CPPUNIT_ASSERT(std::dynamic_pointer_cast<CertificateVerificationError>(sessionFinishedError));
             CPPUNIT_ASSERT_EQUAL(CertificateVerificationError::InvalidServerIdentity, std::dynamic_pointer_cast<CertificateVerificationError>(sessionFinishedError)->getType());
         }
 
@@ -181,7 +200,11 @@ class ClientSessionTest : public CppUnit::TestFixture {
             server->sendStreamStart();
             server->sendEmptyStreamFeatures();
 
-            CPPUNIT_ASSERT_EQUAL(ClientSession::Finished, session->getState());
+            CPPUNIT_ASSERT_EQUAL(ClientSession::State::Finishing, session->getState());
+            CPPUNIT_ASSERT_EQUAL(true, server->receivedEvents.back().footer);
+
+            server->onStreamEndReceived();
+            CPPUNIT_ASSERT_EQUAL(ClientSession::State::Finished, session->getState());
             CPPUNIT_ASSERT(sessionFinishedReceived);
             CPPUNIT_ASSERT(sessionFinishedError);
         }
@@ -193,7 +216,7 @@ class ClientSessionTest : public CppUnit::TestFixture {
             server->sendStreamStart();
             server->sendStreamFeaturesWithPLAINAuthentication();
             CPPUNIT_ASSERT(needCredentials);
-            CPPUNIT_ASSERT_EQUAL(ClientSession::WaitingForCredentials, session->getState());
+            CPPUNIT_ASSERT_EQUAL(ClientSession::State::WaitingForCredentials, session->getState());
             session->sendCredentials(createSafeByteArray("mypass"));
             server->receiveAuthRequest("PLAIN");
             server->sendAuthSuccess();
@@ -209,12 +232,16 @@ class ClientSessionTest : public CppUnit::TestFixture {
             server->sendStreamStart();
             server->sendStreamFeaturesWithPLAINAuthentication();
             CPPUNIT_ASSERT(needCredentials);
-            CPPUNIT_ASSERT_EQUAL(ClientSession::WaitingForCredentials, session->getState());
+            CPPUNIT_ASSERT_EQUAL(ClientSession::State::WaitingForCredentials, session->getState());
             session->sendCredentials(createSafeByteArray("mypass"));
             server->receiveAuthRequest("PLAIN");
             server->sendAuthFailure();
 
-            CPPUNIT_ASSERT_EQUAL(ClientSession::Finished, session->getState());
+            CPPUNIT_ASSERT_EQUAL(ClientSession::State::Finishing, session->getState());
+            CPPUNIT_ASSERT_EQUAL(true, server->receivedEvents.back().footer);
+
+            server->onStreamEndReceived();
+            CPPUNIT_ASSERT_EQUAL(ClientSession::State::Finished, session->getState());
             CPPUNIT_ASSERT(sessionFinishedReceived);
             CPPUNIT_ASSERT(sessionFinishedError);
         }
@@ -227,7 +254,11 @@ class ClientSessionTest : public CppUnit::TestFixture {
             server->sendStreamStart();
             server->sendStreamFeaturesWithPLAINAuthentication();
 
-            CPPUNIT_ASSERT_EQUAL(ClientSession::Finished, session->getState());
+            CPPUNIT_ASSERT_EQUAL(ClientSession::State::Finishing, session->getState());
+            CPPUNIT_ASSERT_EQUAL(true, server->receivedEvents.back().footer);
+
+            server->onStreamEndReceived();
+            CPPUNIT_ASSERT_EQUAL(ClientSession::State::Finished, session->getState());
             CPPUNIT_ASSERT(sessionFinishedReceived);
             CPPUNIT_ASSERT(sessionFinishedError);
         }
@@ -240,8 +271,11 @@ class ClientSessionTest : public CppUnit::TestFixture {
             server->receiveStreamStart();
             server->sendStreamStart();
             server->sendStreamFeaturesWithMultipleAuthentication();
+            CPPUNIT_ASSERT_EQUAL(ClientSession::State::Finishing, session->getState());
+            CPPUNIT_ASSERT_EQUAL(true, server->receivedEvents.back().footer);
 
-            CPPUNIT_ASSERT_EQUAL(ClientSession::Finished, session->getState());
+            server->onStreamEndReceived();
+            CPPUNIT_ASSERT_EQUAL(ClientSession::State::Finished, session->getState());
             CPPUNIT_ASSERT(sessionFinishedReceived);
             CPPUNIT_ASSERT(sessionFinishedError);
         }
@@ -253,7 +287,12 @@ class ClientSessionTest : public CppUnit::TestFixture {
             server->sendStreamStart();
             server->sendStreamFeaturesWithUnknownAuthentication();
 
-            CPPUNIT_ASSERT_EQUAL(ClientSession::Finished, session->getState());
+            CPPUNIT_ASSERT_EQUAL(ClientSession::State::Finishing, session->getState());
+            CPPUNIT_ASSERT_EQUAL(true, server->receivedEvents.back().footer);
+
+            server->onStreamEndReceived();
+            server->close();
+            CPPUNIT_ASSERT_EQUAL(ClientSession::State::Finished, session->getState());
             CPPUNIT_ASSERT(sessionFinishedReceived);
             CPPUNIT_ASSERT(sessionFinishedError);
         }
@@ -281,7 +320,11 @@ class ClientSessionTest : public CppUnit::TestFixture {
             server->sendChallenge();
             server->sendChallenge();
 
-            CPPUNIT_ASSERT_EQUAL(ClientSession::Finished, session->getState());
+            CPPUNIT_ASSERT_EQUAL(ClientSession::State::Finishing, session->getState());
+            CPPUNIT_ASSERT_EQUAL(true, server->receivedEvents.back().footer);
+
+            server->onStreamEndReceived();
+            CPPUNIT_ASSERT_EQUAL(ClientSession::State::Finished, session->getState());
             CPPUNIT_ASSERT(sessionFinishedReceived);
             CPPUNIT_ASSERT(sessionFinishedError);
         }
@@ -305,7 +348,7 @@ class ClientSessionTest : public CppUnit::TestFixture {
 
             CPPUNIT_ASSERT(session->getStreamManagementEnabled());
             // TODO: Test if the requesters & responders do their work
-            CPPUNIT_ASSERT_EQUAL(ClientSession::Initialized, session->getState());
+            CPPUNIT_ASSERT_EQUAL(ClientSession::State::Initialized, session->getState());
 
             session->finish();
         }
@@ -328,7 +371,7 @@ class ClientSessionTest : public CppUnit::TestFixture {
             server->sendStreamManagementFailed();
 
             CPPUNIT_ASSERT(!session->getStreamManagementEnabled());
-            CPPUNIT_ASSERT_EQUAL(ClientSession::Initialized, session->getState());
+            CPPUNIT_ASSERT_EQUAL(ClientSession::State::Initialized, session->getState());
 
             session->finish();
         }
@@ -345,9 +388,44 @@ class ClientSessionTest : public CppUnit::TestFixture {
             server->receiveAck(3);
         }
 
+        void testServerInitiatedSessionClose() {
+            std::shared_ptr<ClientSession> session(createSession());
+            initializeSession(session);
+
+            server->onStreamEndReceived();
+            server->close();
+            CPPUNIT_ASSERT_EQUAL(ClientSession::State::Finished, session->getState());
+            CPPUNIT_ASSERT_EQUAL(true, server->receivedEvents.back().footer);
+        }
+
+        void testClientInitiatedSessionClose() {
+            std::shared_ptr<ClientSession> session(createSession());
+            initializeSession(session);
+
+            session->finish();
+            CPPUNIT_ASSERT_EQUAL(ClientSession::State::Finishing, session->getState());
+            CPPUNIT_ASSERT_EQUAL(true, server->receivedEvents.back().footer);
+
+            server->onStreamEndReceived();
+            CPPUNIT_ASSERT_EQUAL(ClientSession::State::Finished, session->getState());
+        }
+
+        void testTimeoutOnShutdown() {
+            std::shared_ptr<ClientSession> session(createSession());
+            initializeSession(session);
+
+            session->finish();
+            CPPUNIT_ASSERT_EQUAL(ClientSession::State::Finishing, session->getState());
+            CPPUNIT_ASSERT_EQUAL(true, server->receivedEvents.back().footer);
+            timerFactory->setTime(60000);
+
+            CPPUNIT_ASSERT_EQUAL(ClientSession::State::Finished, session->getState());
+            CPPUNIT_ASSERT(sessionFinishedReceived);
+        }
+
     private:
         std::shared_ptr<ClientSession> createSession() {
-            std::shared_ptr<ClientSession> session = ClientSession::create(JID("me@foo.com"), server, idnConverter.get(), crypto.get());
+            std::shared_ptr<ClientSession> session = ClientSession::create(JID("me@foo.com"), server, idnConverter.get(), crypto.get(), timerFactory.get());
             session->onFinished.connect(boost::bind(&ClientSessionTest::handleSessionFinished, this, _1));
             session->onNeedCredentials.connect(boost::bind(&ClientSessionTest::handleSessionNeedCredentials, this));
             session->setAllowPLAINOverNonTLS(true);
@@ -631,6 +709,7 @@ class ClientSessionTest : public CppUnit::TestFixture {
         std::shared_ptr<Error> sessionFinishedError;
         BlindCertificateTrustChecker* blindCertificateTrustChecker;
         std::shared_ptr<CryptoProvider> crypto;
+        std::shared_ptr<DummyTimerFactory> timerFactory;
 };
 
 CPPUNIT_TEST_SUITE_REGISTRATION(ClientSessionTest);