dbus: Add SaveConfig to update configuration file

This is similar to SAVE_CONFIG on control interface, which allow users
to update the configuration file.

Signed-off-by: Purushottam Kushwaha <p.kushwaha@samsung.com>
Signed-off-by: Mayank Haarit <mayank.h@samsung.com>

doc/dbus.doxygen

@@ -455,6 +455,10 @@ fi.w1.wpa_supplicant1.CreateInterface.
 	  <dd>Initiating the TDLS operation failed for an unknown reason.</dd>
 	</dl>
       </li>
+      <li>
+	<h3>SaveConfig ( ) --> nothing</h3>
+	<p>Save configuration to the configuration file.</p>
+      </li>
       <li>
 	<h3>EAPLogoff ( ) --> nothing</h3>
 	<p>IEEE 802.1X EAPOL state machine logoff.</p>

wpa_supplicant/dbus/dbus_new.c

@@ -3069,6 +3069,14 @@ static const struct wpa_dbus_method_desc wpas_dbus_interface_methods[] = {
 	  }
 	},
 #endif /* CONFIG_TDLS */
+#ifndef CONFIG_NO_CONFIG_WRITE
+	{ "SaveConfig", WPAS_DBUS_NEW_IFACE_INTERFACE,
+	  (WPADBusMethodHandler) wpas_dbus_handler_save_config,
+	  {
+		  END_ARGS
+	  }
+	},
+#endif /* CONFIG_NO_CONFIG_WRITE */
 	{ NULL, NULL, NULL, { END_ARGS } }
 };
 

wpa_supplicant/dbus/dbus_new_handlers.c

@@ -2294,6 +2294,35 @@ DBusMessage * wpas_dbus_handler_tdls_teardown(DBusMessage *message,
 #endif /* CONFIG_TDLS */
 
 
+#ifndef CONFIG_NO_CONFIG_WRITE
+/**
+ * wpas_dbus_handler_save_config - Save configuration to configuration file
+ * @message: Pointer to incoming dbus message
+ * @wpa_s: wpa_supplicant structure for a network interface
+ * Returns: NULL on Success, Otherwise errror message
+ *
+ * Handler function for "SaveConfig" method call of network interface.
+ */
+DBusMessage * wpas_dbus_handler_save_config(DBusMessage *message,
+					    struct wpa_supplicant *wpa_s)
+{
+	int ret;
+
+	if (!wpa_s->conf->update_config) {
+		return wpas_dbus_error_unknown_error(
+			message,
+			"Not allowed to update configuration (update_config=0)");
+	}
+
+	ret = wpa_config_write(wpa_s->confname, wpa_s->conf);
+	if (ret)
+		return wpas_dbus_error_unknown_error(
+			message, "Failed to update configuration");
+	return NULL;
+}
+#endif /* CONFIG_NO_CONFIG_WRITE */
+
+
 /**
  * wpas_dbus_handler_set_pkcs11_engine_and_module_path - Set PKCS #11 engine and module path
  * @message: Pointer to incoming dbus message

wpa_supplicant/dbus/dbus_new_handlers.h

@@ -194,6 +194,9 @@ DBusMessage * wpas_dbus_handler_tdls_status(DBusMessage *message,
 DBusMessage * wpas_dbus_handler_tdls_teardown(DBusMessage *message,
 					      struct wpa_supplicant *wpa_s);
 
+DBusMessage * wpas_dbus_handler_save_config(DBusMessage *message,
+					    struct wpa_supplicant *wpa_s);
+
 DBusMessage * wpas_dbus_error_invalid_args(DBusMessage *message,
 					   const char *arg);
 DBusMessage * wpas_dbus_error_unknown_error(DBusMessage *message,