Prevent tdenetworkmanager from crashing when using unmanaged devices.

This relates to bug 2929.

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>
(cherry picked from commit 3192a72a46)

tdecore/tdehw/networkbackends/network-manager/network-manager.cpp

@@ -1158,16 +1158,16 @@ TQString TDENetworkConnectionManager_BackendNM::deviceInterfaceString(TQString d
 					return (*it);
 				}
 			}
-			return "";
+			return TQString::null;
 		}
 		else {
 			// Error!
 			PRINT_ERROR((error.name() + ": " + error.message()))
-			return "";
+			return TQString::null;
 		}
 	}
 	else {
-		return "";
+		return TQString::null;
 	}
 }
 
@@ -1251,7 +1251,7 @@ TDENetworkConnectionManager_BackendNM::TDENetworkConnectionManager_BackendNM(TDE
 	d->m_vpnProxy->setConnection(TQT_DBusConnection::systemBus());
 
 	d->m_dbusDeviceString = deviceInterfaceString(deviceNode());
-	if (d->m_dbusDeviceString != "") {
+	if (!d->m_dbusDeviceString.isEmpty()) {
 		d->m_networkDeviceProxy = new DBus::DeviceProxy(NM_DBUS_SERVICE, d->m_dbusDeviceString);
 		d->m_networkDeviceProxy->setConnection(TQT_DBusConnection::systemBus());
 		if (deviceType() == TDENetworkDeviceType::WiFi) {
@@ -1569,28 +1569,27 @@ TDENetworkDeviceType::TDENetworkDeviceType TDENetworkConnectionManager_BackendNM
 	if (!m_networkDevice) {
 		return TDENetworkDeviceType::BackendOnly;
 	}
-	else {
-		if (d->m_dbusDeviceString != "") {
-			// Query NM for the device type
-			TQT_DBusError error;
-			d->m_dbusDeviceString = deviceInterfaceString(deviceNode());
-			DBus::DeviceProxy genericDevice(NM_DBUS_SERVICE, d->m_dbusDeviceString);
-			genericDevice.setConnection(TQT_DBusConnection::systemBus());
-			TDENetworkDeviceType::TDENetworkDeviceType ret = nmDeviceTypeToTDEDeviceType(genericDevice.getDeviceType(error));
-			if (error.isValid()) {
-				// Error!
-				PRINT_ERROR((error.name() + ": " + error.message()))
-				return TDENetworkDeviceType::Other;
-			}
-			else {
-				return ret;
-			}
-		}
-		else {
+
+	// Query NM for the device type
+	TQT_DBusError error;
+	d->m_dbusDeviceString = deviceInterfaceString(deviceNode());
+	if (!d->m_dbusDeviceString.isEmpty()) {
+		DBus::DeviceProxy genericDevice(NM_DBUS_SERVICE, d->m_dbusDeviceString);
+		genericDevice.setConnection(TQT_DBusConnection::systemBus());
+		TDENetworkDeviceType::TDENetworkDeviceType ret = nmDeviceTypeToTDEDeviceType(genericDevice.getDeviceType(error));
+		if (error.isValid()) {
 			// Error!
-			PRINT_ERROR(TQString("Invalid DBUS device string '%1'").arg(d->m_dbusDeviceString))
+			PRINT_ERROR((error.name() + ": " + error.message()))
 			return TDENetworkDeviceType::Other;
 		}
+		else {
+			return ret;
+		}
+	}
+	else {
+		// Error!
+		PRINT_ERROR(TQString("Invalid empty DBUS device string"))
+		return TDENetworkDeviceType::Other;
 	}
 }
 
@@ -4843,6 +4842,10 @@ TDENetworkConnectionStatus::TDENetworkConnectionStatus TDENetworkConnectionManag
 			else {
 				d->m_dbusDeviceString = deviceInterfaceString(deviceNode());
 			}
+			if (d->m_dbusDeviceString.isEmpty()) {
+				PRINT_ERROR(TQString("Invalid empty DBUS device string"))
+				return TDENetworkConnectionStatus::Invalid;
+			}
 #ifndef USE_ASYNC_DBUS_CONNECTION_COMMAND_CALLS
 			TQT_DBusObjectPath active_connection;
 			ret = d->m_networkManagerProxy->ActivateConnection(existingConnection, TQT_DBusObjectPath(d->m_dbusDeviceString.ascii()), TQT_DBusObjectPath("/"), active_connection, error);
@@ -5036,6 +5039,10 @@ TDENetworkConnectionStatus::TDENetworkConnectionStatus TDENetworkConnectionManag
 			else {
 				d->m_dbusDeviceString = deviceInterfaceString(deviceNode());
 			}
+			if (d->m_dbusDeviceString.isEmpty()) {
+				PRINT_ERROR(TQString("Invalid empty DBUS device string"))
+				return TDENetworkConnectionStatus::Invalid;
+			}
 #ifndef USE_ASYNC_DBUS_CONNECTION_COMMAND_CALLS
 			ret = d->m_networkManagerProxy->DeactivateConnection(existingConnection, error);
 			if (ret && error.isValid()) {
@@ -5322,20 +5329,22 @@ TDENetworkHWNeighborList* TDENetworkConnectionManager_BackendNM::siteSurvey() {
 	clearTDENetworkHWNeighborList();
 
 	if (myDeviceType == TDENetworkDeviceType::WiFi) {
-		DBus::WiFiDeviceProxy wiFiDevice(NM_DBUS_SERVICE, d->m_dbusDeviceString);
-		wiFiDevice.setConnection(TQT_DBusConnection::systemBus());
-		// FIXME
-		// Should call wiFiDevice.RequestScanAsync first to rescan all access points
-		TQT_DBusObjectPathList accessPoints;
-		ret = wiFiDevice.GetAccessPoints(accessPoints, error);
-		if (ret) {
-			TQT_DBusObjectPathList::iterator it;
-			for (it = accessPoints.begin(); it != accessPoints.end(); ++it) {
-				TDENetworkWiFiAPInfo* apInfo = getAccessPointDetails(TQString(*it));
-				if (apInfo) {
-					m_hwNeighborList->append(apInfo);
-					// Ensure that this AP is monitored for changes
-					d->internalProcessWiFiAccessPointAdded(*it);
+		if (!d->m_dbusDeviceString.isEmpty()) {
+			DBus::WiFiDeviceProxy wiFiDevice(NM_DBUS_SERVICE, d->m_dbusDeviceString);
+			wiFiDevice.setConnection(TQT_DBusConnection::systemBus());
+			// FIXME
+			// Should call wiFiDevice.RequestScanAsync first to rescan all access points
+			TQT_DBusObjectPathList accessPoints;
+			ret = wiFiDevice.GetAccessPoints(accessPoints, error);
+			if (ret) {
+				TQT_DBusObjectPathList::iterator it;
+				for (it = accessPoints.begin(); it != accessPoints.end(); ++it) {
+					TDENetworkWiFiAPInfo* apInfo = getAccessPointDetails(TQString(*it));
+					if (apInfo) {
+						m_hwNeighborList->append(apInfo);
+						// Ensure that this AP is monitored for changes
+						d->internalProcessWiFiAccessPointAdded(*it);
+					}
 				}
 			}
 		}