5de49b33e6
If we fail when setting the scanned image to a print, we'll have a fatal error, in such case we can terminate the current action and deactivate the device.
645 lines
21 KiB
C
645 lines
21 KiB
C
/*
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* FpImageDevice - An image based fingerprint reader device - Private APIs
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* Copyright (C) 2019 Benjamin Berg <bberg@redhat.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#define FP_COMPONENT "image_device"
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#include "fpi-log.h"
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#include "fp-image-device-private.h"
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#include "fp-image-device.h"
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/**
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* SECTION: fpi-image
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* @title: Internal FpImage
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* @short_description: Internal image handling routines
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*
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* Internal image handling routines. Also see the public <ulink
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* url="libfprint-FpImage.html">FpImage routines</ulink>.
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*/
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/* Manually redefine what G_DEFINE_* macro does */
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static inline gpointer
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fp_image_device_get_instance_private (FpImageDevice *self)
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{
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FpImageDeviceClass *img_class = g_type_class_peek_static (FP_TYPE_IMAGE_DEVICE);
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return G_STRUCT_MEMBER_P (self,
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g_type_class_get_instance_private_offset (img_class));
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}
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/* Private shared functions */
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void
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fpi_image_device_activate (FpImageDevice *self)
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{
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FpImageDevicePrivate *priv = fp_image_device_get_instance_private (self);
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FpImageDeviceClass *cls = FP_IMAGE_DEVICE_GET_CLASS (self);
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g_assert (!priv->active);
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/* We don't have a neutral ACTIVE state, but we always will
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* go into WAIT_FINGER_ON afterwards. */
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priv->state = FPI_IMAGE_DEVICE_STATE_AWAIT_FINGER_ON;
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g_object_notify (G_OBJECT (self), "fpi-image-device-state");
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/* We might have been waiting for deactivation to finish before
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* starting the next operation. */
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g_clear_handle_id (&priv->pending_activation_timeout_id, g_source_remove);
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fp_dbg ("Activating image device\n");
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cls->activate (self);
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}
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void
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fpi_image_device_deactivate (FpImageDevice *self)
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{
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FpDevice *device = FP_DEVICE (self);
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FpImageDevicePrivate *priv = fp_image_device_get_instance_private (self);
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FpImageDeviceClass *cls = FP_IMAGE_DEVICE_GET_CLASS (device);
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if (!priv->active)
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{
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/* XXX: We currently deactivate both from minutiae scan result
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* and finger off report. */
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fp_dbg ("Already deactivated, ignoring request.");
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return;
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}
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if (!priv->cancelling && priv->state == FPI_IMAGE_DEVICE_STATE_AWAIT_FINGER_ON)
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g_warning ("Deactivating image device while waiting for finger, this should not happen.");
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priv->state = FPI_IMAGE_DEVICE_STATE_INACTIVE;
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g_object_notify (G_OBJECT (self), "fpi-image-device-state");
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fp_dbg ("Deactivating image device\n");
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cls->deactivate (self);
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}
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/* Static helper functions */
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static void
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fp_image_device_change_state (FpImageDevice *self, FpiImageDeviceState state)
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{
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FpImageDevicePrivate *priv = fp_image_device_get_instance_private (self);
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/* Cannot change to inactive using this function. */
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g_assert (state != FPI_IMAGE_DEVICE_STATE_INACTIVE);
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/* We might have been waiting for the finger to go OFF to start the
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* next operation. */
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g_clear_handle_id (&priv->pending_activation_timeout_id, g_source_remove);
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fp_dbg ("Image device internal state change from %d to %d\n", priv->state, state);
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priv->state = state;
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g_object_notify (G_OBJECT (self), "fpi-image-device-state");
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g_signal_emit_by_name (self, "fpi-image-device-state-changed", priv->state);
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}
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static void
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fp_image_device_enroll_maybe_await_finger_on (FpImageDevice *self)
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{
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FpImageDevicePrivate *priv = fp_image_device_get_instance_private (self);
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if (priv->enroll_await_on_pending)
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{
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priv->enroll_await_on_pending = FALSE;
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fp_image_device_change_state (self, FPI_IMAGE_DEVICE_STATE_AWAIT_FINGER_ON);
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}
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else
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{
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priv->enroll_await_on_pending = TRUE;
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}
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}
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static void
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fpi_image_device_minutiae_detected (GObject *source_object, GAsyncResult *res, gpointer user_data)
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{
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g_autoptr(FpImage) image = FP_IMAGE (source_object);
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g_autoptr(FpPrint) print = NULL;
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GError *error = NULL;
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FpImageDevice *self = FP_IMAGE_DEVICE (user_data);
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FpDevice *device = FP_DEVICE (self);
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FpImageDevicePrivate *priv;
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FpiDeviceAction action;
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/* Note: We rely on the device to not disappear during an operation. */
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if (!fp_image_detect_minutiae_finish (image, res, &error))
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{
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/* Cancel operation . */
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if (g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
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{
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fpi_device_action_error (device, g_steal_pointer (&error));
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fpi_image_device_deactivate (self);
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return;
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}
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/* Replace error with a retry condition. */
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g_warning ("Failed to detect minutiae: %s", error->message);
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g_clear_pointer (&error, g_error_free);
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error = fpi_device_retry_new_msg (FP_DEVICE_RETRY_GENERAL, "Minutiae detection failed, please retry");
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}
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priv = fp_image_device_get_instance_private (FP_IMAGE_DEVICE (device));
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action = fpi_device_get_current_action (device);
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if (action == FPI_DEVICE_ACTION_CAPTURE)
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{
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fpi_device_capture_complete (device, g_steal_pointer (&image), error);
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fpi_image_device_deactivate (self);
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return;
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}
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if (!error)
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{
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print = fp_print_new (device);
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fpi_print_set_type (print, FPI_PRINT_NBIS);
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if (!fpi_print_add_from_image (print, image, &error))
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{
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g_clear_object (&print);
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if (error->domain != FP_DEVICE_RETRY)
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{
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fpi_device_action_error (device, error);
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fpi_image_device_deactivate (self);
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return;
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}
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}
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}
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if (action == FPI_DEVICE_ACTION_ENROLL)
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{
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FpPrint *enroll_print;
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fpi_device_get_enroll_data (device, &enroll_print);
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if (print)
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{
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fpi_print_add_print (enroll_print, print);
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priv->enroll_stage += 1;
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}
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fpi_device_enroll_progress (device, priv->enroll_stage,
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g_steal_pointer (&print), error);
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/* Start another scan or deactivate. */
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if (priv->enroll_stage == IMG_ENROLL_STAGES)
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{
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fpi_device_enroll_complete (device, g_object_ref (enroll_print), NULL);
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fpi_image_device_deactivate (self);
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}
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else
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{
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fp_image_device_enroll_maybe_await_finger_on (FP_IMAGE_DEVICE (device));
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}
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}
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else if (action == FPI_DEVICE_ACTION_VERIFY)
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{
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FpPrint *template;
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FpiMatchResult result;
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fpi_device_get_verify_data (device, &template);
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if (print)
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result = fpi_print_bz3_match (template, print, priv->bz3_threshold, &error);
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else
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result = FPI_MATCH_ERROR;
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if (!error || error->domain == FP_DEVICE_RETRY)
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fpi_device_verify_report (device, result, g_steal_pointer (&print), g_steal_pointer (&error));
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fpi_device_verify_complete (device, error);
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fpi_image_device_deactivate (self);
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}
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else if (action == FPI_DEVICE_ACTION_IDENTIFY)
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{
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gint i;
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GPtrArray *templates;
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FpPrint *result = NULL;
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fpi_device_get_identify_data (device, &templates);
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for (i = 0; !error && i < templates->len; i++)
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{
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FpPrint *template = g_ptr_array_index (templates, i);
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if (fpi_print_bz3_match (template, print, priv->bz3_threshold, &error) == FPI_MATCH_SUCCESS)
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{
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result = template;
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break;
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}
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}
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if (!error || error->domain == FP_DEVICE_RETRY)
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fpi_device_identify_report (device, result, g_steal_pointer (&print), g_steal_pointer (&error));
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fpi_device_identify_complete (device, error);
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fpi_image_device_deactivate (self);
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}
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else
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{
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/* XXX: This can be hit currently due to a race condition in the enroll code!
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* In that case we scan a further image even though the minutiae for the previous
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* one have not yet been detected.
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* We need to keep track on the pending minutiae detection and the fact that
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* it will finish eventually (or we may need to retry on error and activate the
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* device again). */
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g_assert_not_reached ();
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}
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}
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/*********************************************************/
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/* Private API */
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/**
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* fpi_image_device_set_bz3_threshold:
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* @self: a #FpImageDevice imaging fingerprint device
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* @bz3_threshold: BZ3 threshold to use
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*
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* Dynamically adjust the bz3 threshold. This is only needed for drivers
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* that support devices with different properties. It should generally be
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* called from the probe callback, but is acceptable to call from the open
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* callback.
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*/
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void
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fpi_image_device_set_bz3_threshold (FpImageDevice *self,
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gint bz3_threshold)
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{
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FpImageDevicePrivate *priv = fp_image_device_get_instance_private (self);
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g_return_if_fail (FP_IS_IMAGE_DEVICE (self));
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g_return_if_fail (bz3_threshold > 0);
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priv->bz3_threshold = bz3_threshold;
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}
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/**
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* fpi_image_device_report_finger_status:
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* @self: a #FpImageDevice imaging fingerprint device
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* @present: whether the finger is present on the sensor
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*
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* Reports from the driver whether the user's finger is on
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* the sensor.
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*/
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void
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fpi_image_device_report_finger_status (FpImageDevice *self,
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gboolean present)
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{
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FpDevice *device = FP_DEVICE (self);
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FpImageDevicePrivate *priv = fp_image_device_get_instance_private (self);
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FpiDeviceAction action;
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if (priv->state == FPI_IMAGE_DEVICE_STATE_INACTIVE)
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{
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/* Do we really want to always ignore such reports? We could
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* also track the state in case the user had the finger on
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* the device at initialisation time and the driver reports
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* this early.
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*/
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g_debug ("Ignoring finger presence report as the device is not active!");
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return;
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}
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action = fpi_device_get_current_action (device);
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g_assert (action != FPI_DEVICE_ACTION_OPEN);
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g_assert (action != FPI_DEVICE_ACTION_CLOSE);
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g_debug ("Image device reported finger status: %s", present ? "on" : "off");
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if (present && priv->state == FPI_IMAGE_DEVICE_STATE_AWAIT_FINGER_ON)
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{
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fp_image_device_change_state (self, FPI_IMAGE_DEVICE_STATE_CAPTURE);
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}
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else if (!present && priv->state == FPI_IMAGE_DEVICE_STATE_AWAIT_FINGER_OFF)
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{
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/* We need to deactivate or continue to await finger */
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/* There are three possible situations:
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* 1. We are deactivating the device and the action is still in progress
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* (minutiae detection).
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* 2. We are still deactivating the device after an action completed
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* 3. We were waiting for finger removal to start the new action
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* Either way, we always end up deactivating except for the enroll case.
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*
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* The enroll case is special as AWAIT_FINGER_ON should only happen after
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* minutiae detection to prevent deactivation (without cancellation)
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* from the AWAIT_FINGER_ON state.
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*/
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if (action != FPI_DEVICE_ACTION_ENROLL)
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fpi_image_device_deactivate (self);
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else
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fp_image_device_enroll_maybe_await_finger_on (self);
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}
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}
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/**
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* fpi_image_device_image_captured:
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* @self: a #FpImageDevice imaging fingerprint device
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* @image: whether the finger is present on the sensor
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*
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* Reports an image capture. Only use this function if the image was
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* captured successfully. If there was an issue where the user should
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* retry, use fpi_image_device_retry_scan() to report the retry condition.
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*
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* In the event of a fatal error for the operation use
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* fpi_image_device_session_error(). This will abort the entire operation
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* including e.g. an enroll operation which captures multiple images during
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* one session.
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*/
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void
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fpi_image_device_image_captured (FpImageDevice *self, FpImage *image)
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{
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FpImageDevicePrivate *priv = fp_image_device_get_instance_private (self);
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FpiDeviceAction action;
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action = fpi_device_get_current_action (FP_DEVICE (self));
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g_return_if_fail (image != NULL);
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g_return_if_fail (priv->state == FPI_IMAGE_DEVICE_STATE_CAPTURE);
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g_return_if_fail (action == FPI_DEVICE_ACTION_ENROLL ||
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action == FPI_DEVICE_ACTION_VERIFY ||
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action == FPI_DEVICE_ACTION_IDENTIFY ||
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action == FPI_DEVICE_ACTION_CAPTURE);
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fp_image_device_change_state (self, FPI_IMAGE_DEVICE_STATE_AWAIT_FINGER_OFF);
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g_debug ("Image device captured an image");
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/* XXX: We also detect minutiae in capture mode, we solely do this
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* to normalize the image which will happen as a by-product. */
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fp_image_detect_minutiae (image,
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fpi_device_get_cancellable (FP_DEVICE (self)),
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fpi_image_device_minutiae_detected,
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self);
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}
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/**
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* fpi_image_device_retry_scan:
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* @self: a #FpImageDevice imaging fingerprint device
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* @retry: The #FpDeviceRetry error code to report
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*
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* Reports a scan failure to the user. This may or may not abort the
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* current session. It is the equivalent of fpi_image_device_image_captured()
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* in the case of a retryable error condition (e.g. short swipe).
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*/
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void
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fpi_image_device_retry_scan (FpImageDevice *self, FpDeviceRetry retry)
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{
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FpImageDevicePrivate *priv = fp_image_device_get_instance_private (self);
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FpiDeviceAction action;
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GError *error;
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action = fpi_device_get_current_action (FP_DEVICE (self));
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/* We might be waiting for a finger at this point, so just accept
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* all but INACTIVE */
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g_return_if_fail (priv->state != FPI_IMAGE_DEVICE_STATE_INACTIVE);
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g_return_if_fail (action == FPI_DEVICE_ACTION_ENROLL ||
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action == FPI_DEVICE_ACTION_VERIFY ||
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action == FPI_DEVICE_ACTION_IDENTIFY ||
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action == FPI_DEVICE_ACTION_CAPTURE);
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error = fpi_device_retry_new (retry);
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if (action == FPI_DEVICE_ACTION_ENROLL)
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{
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g_debug ("Reporting retry during enroll");
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fpi_device_enroll_progress (FP_DEVICE (self), priv->enroll_stage, NULL, error);
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/* Wait for finger removal and re-touch.
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* TODO: Do we need to check that the finger is already off? */
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priv->enroll_await_on_pending = TRUE;
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fp_image_device_change_state (self, FPI_IMAGE_DEVICE_STATE_AWAIT_FINGER_OFF);
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}
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else if (action == FPI_DEVICE_ACTION_VERIFY)
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{
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fpi_device_verify_report (FP_DEVICE (self), FPI_MATCH_ERROR, NULL, error);
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priv->cancelling = TRUE;
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fpi_image_device_deactivate (self);
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priv->cancelling = FALSE;
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fpi_device_verify_complete (FP_DEVICE (self), NULL);
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}
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else if (action == FPI_DEVICE_ACTION_IDENTIFY)
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{
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fpi_device_identify_report (FP_DEVICE (self), NULL, NULL, error);
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priv->cancelling = TRUE;
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fpi_image_device_deactivate (self);
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priv->cancelling = FALSE;
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fpi_device_identify_complete (FP_DEVICE (self), NULL);
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}
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else
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{
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/* We abort the operation and let the surrounding code retry in the
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* non-enroll case (this is identical to a session error). */
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g_debug ("Abort current operation due to retry (non-enroll case)");
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priv->cancelling = TRUE;
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fpi_image_device_deactivate (self);
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priv->cancelling = FALSE;
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fpi_device_action_error (FP_DEVICE (self), error);
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}
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}
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/**
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* fpi_image_device_session_error:
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* @self: a #FpImageDevice imaging fingerprint device
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* @error: The #GError to report
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*
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* Report an error while interacting with the device. This effectively
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* aborts the current ongoing action. Note that doing so will result in
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* the deactivation handler to be called and this function must not be
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* used to report an error during deactivation.
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*/
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void
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fpi_image_device_session_error (FpImageDevice *self, GError *error)
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{
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FpImageDevicePrivate *priv = fp_image_device_get_instance_private (self);
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g_return_if_fail (self);
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if (!error)
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{
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g_warning ("Driver did not provide an error, generating a generic one");
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error = g_error_new (FP_DEVICE_ERROR, FP_DEVICE_ERROR_GENERAL, "Driver reported session error without an error");
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}
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if (!priv->active)
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{
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FpiDeviceAction action = fpi_device_get_current_action (FP_DEVICE (self));
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g_warning ("Driver reported session error, but device is inactive.");
|
|
|
|
if (action != FPI_DEVICE_ACTION_NONE)
|
|
{
|
|
g_warning ("Translating to activation failure!");
|
|
fpi_image_device_activate_complete (self, error);
|
|
return;
|
|
}
|
|
}
|
|
else if (g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED) &&
|
|
fpi_device_action_is_cancelled (FP_DEVICE (self)))
|
|
{
|
|
/* Ignore cancellation errors here, as we will explicitly deactivate
|
|
* anyway (or, may already have done so at this point).
|
|
*/
|
|
g_debug ("Driver reported a cancellation error, this is expected but not required. Ignoring.");
|
|
g_clear_error (&error);
|
|
return;
|
|
}
|
|
else if (priv->state == FPI_IMAGE_DEVICE_STATE_INACTIVE)
|
|
{
|
|
g_warning ("Driver reported session error while deactivating already, ignoring. This indicates a driver bug.");
|
|
g_clear_error (&error);
|
|
return;
|
|
}
|
|
|
|
if (error->domain == FP_DEVICE_RETRY)
|
|
g_warning ("Driver should report retries using fpi_image_device_retry_scan!");
|
|
|
|
priv->cancelling = TRUE;
|
|
fpi_image_device_deactivate (self);
|
|
priv->cancelling = FALSE;
|
|
fpi_device_action_error (FP_DEVICE (self), error);
|
|
}
|
|
|
|
/**
|
|
* fpi_image_device_activate_complete:
|
|
* @self: a #FpImageDevice imaging fingerprint device
|
|
* @error: A #GError or %NULL on success
|
|
*
|
|
* Reports completion of device activation.
|
|
*/
|
|
void
|
|
fpi_image_device_activate_complete (FpImageDevice *self, GError *error)
|
|
{
|
|
FpImageDevicePrivate *priv = fp_image_device_get_instance_private (self);
|
|
FpiDeviceAction action;
|
|
|
|
action = fpi_device_get_current_action (FP_DEVICE (self));
|
|
|
|
g_return_if_fail (priv->active == FALSE);
|
|
g_return_if_fail (action == FPI_DEVICE_ACTION_ENROLL ||
|
|
action == FPI_DEVICE_ACTION_VERIFY ||
|
|
action == FPI_DEVICE_ACTION_IDENTIFY ||
|
|
action == FPI_DEVICE_ACTION_CAPTURE);
|
|
|
|
if (error)
|
|
{
|
|
g_debug ("Image device activation failed");
|
|
fpi_device_action_error (FP_DEVICE (self), error);
|
|
return;
|
|
}
|
|
|
|
g_debug ("Image device activation completed");
|
|
|
|
priv->active = TRUE;
|
|
|
|
/* We always want to capture at this point, move to AWAIT_FINGER
|
|
* state. */
|
|
fp_image_device_change_state (self, FPI_IMAGE_DEVICE_STATE_AWAIT_FINGER_ON);
|
|
}
|
|
|
|
/**
|
|
* fpi_image_device_deactivate_complete:
|
|
* @self: a #FpImageDevice imaging fingerprint device
|
|
* @error: A #GError or %NULL on success
|
|
*
|
|
* Reports completion of device deactivation.
|
|
*/
|
|
void
|
|
fpi_image_device_deactivate_complete (FpImageDevice *self, GError *error)
|
|
{
|
|
FpImageDevicePrivate *priv = fp_image_device_get_instance_private (self);
|
|
FpImageDeviceClass *cls = FP_IMAGE_DEVICE_GET_CLASS (self);
|
|
FpiDeviceAction action;
|
|
|
|
g_return_if_fail (priv->active == TRUE);
|
|
g_return_if_fail (priv->state == FPI_IMAGE_DEVICE_STATE_INACTIVE);
|
|
|
|
g_debug ("Image device deactivation completed");
|
|
|
|
priv->active = FALSE;
|
|
|
|
/* Deactivation completed. As we deactivate in the background
|
|
* there may already be a new task pending. Check whether we
|
|
* need to do anything. */
|
|
action = fpi_device_get_current_action (FP_DEVICE (self));
|
|
|
|
/* Special case, if we should be closing, but didn't due to a running
|
|
* deactivation, then do so now. */
|
|
if (action == FPI_DEVICE_ACTION_CLOSE)
|
|
{
|
|
cls->img_close (self);
|
|
return;
|
|
}
|
|
|
|
/* We might be waiting to be able to activate again. */
|
|
if (priv->pending_activation_timeout_id)
|
|
{
|
|
g_clear_handle_id (&priv->pending_activation_timeout_id, g_source_remove);
|
|
priv->pending_activation_timeout_id =
|
|
g_idle_add ((GSourceFunc) fpi_image_device_activate, self);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* fpi_image_device_open_complete:
|
|
* @self: a #FpImageDevice imaging fingerprint device
|
|
* @error: A #GError or %NULL on success
|
|
*
|
|
* Reports completion of open operation.
|
|
*/
|
|
void
|
|
fpi_image_device_open_complete (FpImageDevice *self, GError *error)
|
|
{
|
|
FpImageDevicePrivate *priv = fp_image_device_get_instance_private (self);
|
|
FpiDeviceAction action;
|
|
|
|
action = fpi_device_get_current_action (FP_DEVICE (self));
|
|
|
|
g_return_if_fail (priv->active == FALSE);
|
|
g_return_if_fail (action == FPI_DEVICE_ACTION_OPEN);
|
|
|
|
g_debug ("Image device open completed");
|
|
|
|
priv->state = FPI_IMAGE_DEVICE_STATE_INACTIVE;
|
|
g_object_notify (G_OBJECT (self), "fpi-image-device-state");
|
|
|
|
fpi_device_open_complete (FP_DEVICE (self), error);
|
|
}
|
|
|
|
/**
|
|
* fpi_image_device_close_complete:
|
|
* @self: a #FpImageDevice imaging fingerprint device
|
|
* @error: A #GError or %NULL on success
|
|
*
|
|
* Reports completion of close operation.
|
|
*/
|
|
void
|
|
fpi_image_device_close_complete (FpImageDevice *self, GError *error)
|
|
{
|
|
FpImageDevicePrivate *priv = fp_image_device_get_instance_private (self);
|
|
FpiDeviceAction action;
|
|
|
|
action = fpi_device_get_current_action (FP_DEVICE (self));
|
|
|
|
g_debug ("Image device close completed");
|
|
|
|
g_return_if_fail (priv->active == FALSE);
|
|
g_return_if_fail (action == FPI_DEVICE_ACTION_CLOSE);
|
|
|
|
priv->state = FPI_IMAGE_DEVICE_STATE_INACTIVE;
|
|
g_object_notify (G_OBJECT (self), "fpi-image-device-state");
|
|
|
|
fpi_device_close_complete (FP_DEVICE (self), error);
|
|
}
|