Make Capture -> Refresh Interfaces work.

Add a "refresh the local interfaces" method to WiresharkApplication,
which reloads the interface list and emits the "interface list changed"
signal, and invoke it from the Capture -> Refresh Interfaces menu item.

Change-Id: I9641e4b341eb44d773c556691d8bb9dac776ea9d
Reviewed-on: https://code.wireshark.org/review/3195
Reviewed-by: Guy Harris <guy@alum.mit.edu>

ui/qt/main_window.h

@@ -286,6 +286,7 @@ private slots:
 
 #ifdef HAVE_LIBPCAP
     void on_actionCaptureOptions_triggered();
+    void on_actionCaptureRefreshInterfaces_triggered();
 #endif
 
     void matchFieldFilter(FilterAction::Action action, FilterAction::ActionType filter_type);

ui/qt/main_window_slots.cpp

@@ -2390,6 +2390,11 @@ void MainWindow::on_actionCaptureOptions_triggered()
     capture_interfaces_dialog_.raise();
     capture_interfaces_dialog_.activateWindow();
 }
+
+void MainWindow::on_actionCaptureRefreshInterfaces_triggered()
+{
+    wsApp->refreshLocalInterfaces();
+}
 #endif
 
 

ui/qt/wireshark_application.cpp

@@ -706,6 +706,24 @@ void WiresharkApplication::ifChangeEventsAvailable()
 #endif
 }
 
+void WiresharkApplication::refreshLocalInterfaces()
+{
+#ifdef HAVE_LIBPCAP
+    /*
+     * Reload the local interface list.
+     */
+    scan_local_interfaces(main_window_update);
+
+    /*
+     * Now emit a signal to indicate that the list changed, so that all
+     * places displaying the list will get updated.
+     *
+     * XXX - only if it *did* change.
+     */
+    emit localInterfaceListChanged();
+#endif
+}
+
 void WiresharkApplication::allSystemsGo()
 {
     QString display_filter = NULL;

ui/qt/wireshark_application.h

@@ -74,6 +74,7 @@ public:
     void emitAppSignal(AppSignal signal);
     void emitStatCommandSignal(const QString &menu_path, const char *arg, void *userdata);
     void allSystemsGo();
+    void refreshLocalInterfaces();
     e_prefs * readConfigurationFiles(char **gdp_path, char **dp_path);
     QList<recent_item_status *> recentItems() const;
     void addRecentItem(const QString &filename, qint64 size, bool accessible);