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libfprint/examples/identify.c

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/*
* Example fingerprint verification program, which verifies the
* finger which has been previously enrolled to disk.
* Copyright (C) 2020 Marco Trevisan <marco.trevisan@canonical.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#define FP_COMPONENT "example-identify"
#include <stdio.h>
#include <libfprint/fprint.h>
#include <glib-unix.h>
#include "storage.h"
#include "utilities.h"
typedef struct _IdentifyData
{
GMainLoop *loop;
GCancellable *cancellable;
unsigned int sigint_handler;
int ret_value;
} IdentifyData;
static void
identify_data_free (IdentifyData *identify_data)
{
g_clear_handle_id (&identify_data->sigint_handler, g_source_remove);
g_clear_object (&identify_data->cancellable);
g_main_loop_unref (identify_data->loop);
g_free (identify_data);
}
G_DEFINE_AUTOPTR_CLEANUP_FUNC (IdentifyData, identify_data_free)
static void
on_device_closed (FpDevice *dev, GAsyncResult *res, void *user_data)
{
IdentifyData *identify_data = user_data;
g_autoptr(GError) error = NULL;
fp_device_close_finish (dev, res, &error);
if (error)
g_warning ("Failed closing device %s", error->message);
g_main_loop_quit (identify_data->loop);
}
static void
identify_quit (FpDevice *dev,
IdentifyData *identify_data)
{
if (!fp_device_is_open (dev))
{
g_main_loop_quit (identify_data->loop);
return;
}
fp_device_close (dev, NULL, (GAsyncReadyCallback) on_device_closed, identify_data);
}
static void start_identification (FpDevice *dev,
IdentifyData *identify_data);
static void
on_identify_completed (FpDevice *dev, GAsyncResult *res, void *user_data)
{
IdentifyData *identify_data = user_data;
g_autoptr(FpPrint) print = NULL;
g_autoptr(FpPrint) match = NULL;
g_autoptr(GError) error = NULL;
char buffer[20];
if (!fp_device_identify_finish (dev, res, &match, &print, &error))
{
g_warning ("Failed to identify print: %s", error->message);
identify_data->ret_value = EXIT_FAILURE;
if (error->domain != FP_DEVICE_RETRY)
{
identify_quit (dev, identify_data);
return;
}
}
g_print ("Identify again? [Y/n]? ");
if (fgets (buffer, sizeof (buffer), stdin) &&
(buffer[0] == 'Y' || buffer[0] == 'y' || buffer[0] == '\n'))
{
start_identification (dev, identify_data);
return;
}
identify_quit (dev, identify_data);
}
static FpPrint *
get_stored_print (FpDevice *dev, FpPrint *print)
{
g_autoptr(GPtrArray) gallery = gallery_data_load (dev);
guint index;
if (g_ptr_array_find_with_equal_func (gallery, print,
(GEqualFunc) fp_print_equal,
&index))
return g_object_ref (g_ptr_array_index (gallery, index));
return NULL;
}
static void
on_identify_cb (FpDevice *dev, FpPrint *match, FpPrint *print,
gpointer user_data, GError *error)
{
IdentifyData *identify_data = user_data;
if (error)
{
g_warning ("Identify report: No finger matched, retry error reported: %s",
error->message);
return;
}
if (print && fp_print_get_image (print) &&
print_image_save (print, "identify.pgm"))
g_print ("Print image saved as identify.pgm\n");
if (match)
{
g_autoptr(FpPrint) matched_print = g_object_ref (match);
char date_str[128] = {};
identify_data->ret_value = EXIT_SUCCESS;
if (fp_print_get_device_stored (match))
{
FpPrint *stored_print = get_stored_print (dev, match);
if (stored_print)
matched_print = g_steal_pointer (&stored_print);
}
if (fp_print_get_enroll_date (matched_print))
g_date_strftime (date_str, G_N_ELEMENTS (date_str), "%Y-%m-%d\0",
fp_print_get_enroll_date (matched_print));
else
strcpy (date_str, "<unknown>");
g_debug ("Identify report: device %s matched finger %s successfully "
"with print '%s', enrolled on date %s by user %s",
fp_device_get_name (dev),
finger_to_string (fp_print_get_finger (matched_print)),
fp_print_get_description (matched_print), date_str,
fp_print_get_username (matched_print));
g_print ("IDENTIFIED!\n");
}
else
{
g_debug ("Identification report: No finger matched");
g_print ("NOT IDENTIFIED!\n");
}
}
static void
on_list_completed (FpDevice *dev, GAsyncResult *res, gpointer user_data)
{
IdentifyData *identify_data = user_data;
g_autoptr(GPtrArray) gallery = NULL;
g_autoptr(GError) error = NULL;
gallery = fp_device_list_prints_finish (dev, res, &error);
if (!error)
{
if (!gallery->len)
{
g_warning ("No prints saved on device");
identify_quit (dev, identify_data);
return;
}
g_debug ("Identifying with %u prints in gallery", gallery->len);
fp_device_identify (dev, gallery, identify_data->cancellable,
on_identify_cb, identify_data, NULL,
(GAsyncReadyCallback) on_identify_completed,
identify_data);
}
else
{
g_warning ("Loading prints failed with error %s", error->message);
identify_quit (dev, identify_data);
}
}
static void
start_identification (FpDevice *dev, IdentifyData *identify_data)
{
if (fp_device_has_feature (dev, FP_DEVICE_FEATURE_STORAGE))
{
g_print ("Creating finger template, using device storage...\n");
fp_device_list_prints (dev, NULL,
(GAsyncReadyCallback) on_list_completed,
identify_data);
}
else
{
g_autoptr(GPtrArray) gallery = gallery_data_load (dev);
if (!gallery)
{
identify_quit (dev, identify_data);
return;
}
g_print ("Gallery loaded. Time to identify!\n");
fp_device_identify (dev, gallery, identify_data->cancellable,
on_identify_cb, identify_data, NULL,
(GAsyncReadyCallback) on_identify_completed,
identify_data);
}
}
static void
on_device_opened (FpDevice *dev, GAsyncResult *res, void *user_data)
{
IdentifyData *identify_data = user_data;
g_autoptr(GError) error = NULL;
if (!fp_device_open_finish (dev, res, &error))
{
g_warning ("Failed to open device: %s", error->message);
identify_quit (dev, identify_data);
return;
}
g_print ("Opened device. ");
start_identification (dev, identify_data);
}
static gboolean
sigint_cb (void *user_data)
{
IdentifyData *identify_data = user_data;
g_cancellable_cancel (identify_data->cancellable);
return G_SOURCE_CONTINUE;
}
int
main (void)
{
g_autoptr(FpContext) ctx = NULL;
g_autoptr(IdentifyData) identify_data = NULL;
GPtrArray *devices;
FpDevice *dev;
setenv ("G_MESSAGES_DEBUG", "all", 0);
setenv ("LIBUSB_DEBUG", "3", 0);
ctx = fp_context_new ();
devices = fp_context_get_devices (ctx);
if (!devices)
{
g_warning ("Impossible to get devices");
return EXIT_FAILURE;
}
dev = discover_device (devices);
if (!dev)
{
g_warning ("No devices detected.");
return EXIT_FAILURE;
}
if (!fp_device_has_feature (dev, FP_DEVICE_FEATURE_IDENTIFY))
{
g_warning ("Device %s does not support identification.",
fp_device_get_name (dev));
return EXIT_FAILURE;
}
identify_data = g_new0 (IdentifyData, 1);
identify_data->ret_value = EXIT_FAILURE;
identify_data->loop = g_main_loop_new (NULL, FALSE);
identify_data->cancellable = g_cancellable_new ();
identify_data->sigint_handler = g_unix_signal_add_full (G_PRIORITY_HIGH,
SIGINT,
sigint_cb,
identify_data,
NULL);
fp_device_open (dev, identify_data->cancellable,
(GAsyncReadyCallback) on_device_opened,
identify_data);
g_main_loop_run (identify_data->loop);
return identify_data->ret_value;
}
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