dbus: Add boolean AllowRoam option to Scan() method options dictionary

To disallow roaming when a scan request's results are read, callers
of the D-Bus Scan() method may add a new "AllowRoam" boolean key
to the scan options dictionary and set that key's value to FALSE.

Signed-hostap: Dan Williams <dcbw@redhat.com>

wpa_supplicant/dbus/dbus_new_handlers.c

@@ -1236,6 +1236,23 @@ static int wpas_dbus_get_scan_channels(DBusMessage *message,
 }
 
 
+static int wpas_dbus_get_scan_allow_roam(DBusMessage *message,
+					 DBusMessageIter *var,
+					 dbus_bool_t *allow,
+					 DBusMessage **reply)
+{
+	if (dbus_message_iter_get_arg_type(var) != DBUS_TYPE_BOOLEAN) {
+		wpa_printf(MSG_DEBUG, "wpas_dbus_handler_scan[dbus]: "
+			   "Type must be a boolean");
+		*reply = wpas_dbus_error_invalid_args(
+			message, "Wrong Type value type. Boolean required");
+		return -1;
+	}
+	dbus_message_iter_get_basic(var, allow);
+	return 0;
+}
+
+
 /**
  * wpas_dbus_handler_scan - Request a wireless scan on an interface
  * @message: Pointer to incoming dbus message
@@ -1254,6 +1271,7 @@ DBusMessage * wpas_dbus_handler_scan(DBusMessage *message,
 	char *key = NULL, *type = NULL;
 	struct wpa_driver_scan_params params;
 	size_t i;
+	dbus_bool_t allow_roam = 1;
 
 	os_memset(&params, 0, sizeof(params));
 
@@ -1284,6 +1302,12 @@ DBusMessage * wpas_dbus_handler_scan(DBusMessage *message,
 			if (wpas_dbus_get_scan_channels(message, &variant_iter,
 							&params, &reply) < 0)
 				goto out;
+		} else if (os_strcmp(key, "AllowRoam") == 0) {
+			if (wpas_dbus_get_scan_allow_roam(message,
+							  &variant_iter,
+							  &allow_roam,
+							  &reply) < 0)
+				goto out;
 		} else {
 			wpa_printf(MSG_DEBUG, "wpas_dbus_handler_scan[dbus]: "
 				   "Unknown argument %s", key);
@@ -1332,6 +1356,9 @@ DBusMessage * wpas_dbus_handler_scan(DBusMessage *message,
 		goto out;
 	}
 
+	if (!allow_roam)
+		wpa_s->scan_res_handler = scan_only_handler;
+
 out:
 	for (i = 0; i < WPAS_MAX_SCAN_SSIDS; i++)
 		os_free((u8 *) params.ssids[i].ssid);