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libfprint/examples/verify.c
Marco Trevisan (Treviño) cdcc476325 examples/verify: Prompt match/no-match report in callback 
Promptly show the match/no-match result in the match callback instead of
waiting the verification process to be finished.

Also exit in case of an hard error, while permit to try again in case of a
retry error.
2020-01-17 19:44:52 +01:00

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/*
* Example fingerprint verification program, which verifies the
* finger which has been previously enrolled to disk.
* Copyright (C) 2007 Daniel Drake <dsd@gentoo.org>
* Copyright (C) 2019 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-verify"
#include <stdio.h>
#include <libfprint/fprint.h>
#include "storage.h"
#include "utilities.h"
typedef struct _VerifyData
{
GMainLoop *loop;
FpFinger finger;
int ret_value;
} VerifyData;
static void
verify_data_free (VerifyData *verify_data)
{
g_main_loop_unref (verify_data->loop);
g_free (verify_data);
}
G_DEFINE_AUTOPTR_CLEANUP_FUNC (VerifyData, verify_data_free)
static void
on_device_closed (FpDevice *dev, GAsyncResult *res, void *user_data)
{
VerifyData *verify_data = user_data;
g_autoptr(GError) error = NULL;
fp_device_close_finish (dev, res, &error);
if (error)
g_warning ("Failed closing device %s\n", error->message);
g_main_loop_quit (verify_data->loop);
}
static void
verify_quit (FpDevice *dev,
VerifyData *verify_data)
{
if (!fp_device_is_open (dev))
{
g_main_loop_quit (verify_data->loop);
return;
}
fp_device_close (dev, NULL, (GAsyncReadyCallback) on_device_closed, verify_data);
}
static void start_verification (FpDevice *dev,
VerifyData *verify_data);
static void
on_verify_completed (FpDevice *dev, GAsyncResult *res, void *user_data)
{
VerifyData *verify_data = user_data;
g_autoptr(FpPrint) print = NULL;
g_autoptr(GError) error = NULL;
char buffer[20];
gboolean match;
if (!fp_device_verify_finish (dev, res, &match, &print, &error))
{
g_warning ("Failed to verify print: %s", error->message);
verify_data->ret_value = EXIT_FAILURE;
if (error->domain != FP_DEVICE_RETRY)
{
verify_quit (dev, verify_data);
return;
}
}
g_print ("Verify again? [Y/n]? ");
if (fgets (buffer, sizeof (buffer), stdin) &&
(buffer[0] == 'Y' || buffer[0] == 'y' || buffer[0] == '\n'))
{
start_verification (dev, verify_data);
return;
}
verify_quit (dev, verify_data);
}
static void
on_match_cb (FpDevice *dev, FpPrint *match, FpPrint *print,
gpointer user_data, GError *error)
{
VerifyData *verify_data = user_data;
if (error)
{
g_warning ("Match report: Finger not matched, retry error reported: %s",
error->message);
return;
}
if (print && fp_device_supports_capture (dev) &&
print_image_save (print, "verify.pgm"))
g_print ("Print image saved as verify.pgm\n");
if (match)
{
char date_str[128];
verify_data->ret_value = EXIT_SUCCESS;
g_date_strftime (date_str, G_N_ELEMENTS (date_str), "%Y-%m-%d\0",
fp_print_get_enroll_date (match));
g_debug ("Match report: device %s matched finger %s successifully "
"with print %s, enrolled on date %s by user %s",
fp_device_get_name (dev),
finger_to_string (fp_print_get_finger (match)),
fp_print_get_description (match), date_str,
fp_print_get_username (match));
g_print ("MATCH!\n");
}
else
{
g_debug ("Match report: Finger not matched");
g_print ("NO MATCH!\n");
}
}
static void
on_list_completed (FpDevice *dev, GAsyncResult *res, gpointer user_data)
{
VerifyData *verify_data = user_data;
g_autoptr(GPtrArray) prints = NULL;
g_autoptr(GError) error = NULL;
prints = fp_device_list_prints_finish (dev, res, &error);
if (!error)
{
FpPrint *verify_print = NULL;
guint i;
if (!prints->len)
g_warning ("No prints saved on device");
for (i = 0; i < prints->len; ++i)
{
FpPrint *print = prints->pdata[i];
if (fp_print_get_finger (print) == verify_data->finger &&
g_strcmp0 (fp_print_get_username (print), g_get_user_name ()) == 0)
{
const GDate *verify_print_date = NULL;
const GDate *print_date = fp_print_get_enroll_date (print);
if (verify_print)
verify_print_date = fp_print_get_enroll_date (verify_print);
if (!verify_print || !print_date || !verify_print_date ||
g_date_compare (print_date, verify_print_date) >= 0)
verify_print = print;
}
}
if (!verify_print)
{
g_warning ("Did you remember to enroll your %s finger first?",
finger_to_string (verify_data->finger));
verify_quit (dev, verify_data);
return;
}
g_debug ("Comparing print with %s",
fp_print_get_description (verify_print));
g_print ("Print loaded. Time to verify!\n");
fp_device_verify (dev, verify_print, NULL,
on_match_cb, verify_data, NULL,
(GAsyncReadyCallback) on_verify_completed,
verify_data);
}
else
{
g_warning ("Loading prints failed with error %s", error->message);
verify_quit (dev, verify_data);
}
}
static void
start_verification (FpDevice *dev, VerifyData *verify_data)
{
if (verify_data->finger == FP_FINGER_UNKNOWN)
{
g_print ("Choose the finger to verify:\n");
verify_data->finger = finger_chooser ();
}
if (verify_data->finger == FP_FINGER_UNKNOWN)
{
g_warning ("Unknown finger selected");
verify_data->ret_value = EXIT_FAILURE;
verify_quit (dev, verify_data);
return;
}
if (fp_device_has_storage (dev))
{
g_print ("Creating finger template, using device storage...\n");
fp_device_list_prints (dev, NULL,
(GAsyncReadyCallback) on_list_completed,
verify_data);
}
else
{
g_print ("Loading previously enrolled %s finger data...\n",
finger_to_string (verify_data->finger));
g_autoptr(FpPrint) verify_print = NULL;
verify_print = print_data_load (dev, verify_data->finger);
if (!verify_print)
{
g_warning ("Failed to load fingerprint data");
g_warning ("Did you remember to enroll your %s finger first?",
finger_to_string (verify_data->finger));
verify_quit (dev, verify_data);
return;
}
g_print ("Print loaded. Time to verify!\n");
fp_device_verify (dev, verify_print, NULL,
NULL, NULL, NULL,
(GAsyncReadyCallback) on_verify_completed,
verify_data);
}
}
static void
on_device_opened (FpDevice *dev, GAsyncResult *res, void *user_data)
{
VerifyData *verify_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);
verify_quit (dev, verify_data);
return;
}
g_print ("Opened device. ");
start_verification (dev, verify_data);
}
int
main (void)
{
g_autoptr(FpContext) ctx = NULL;
g_autoptr(VerifyData) verify_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;
}
verify_data = g_new0 (VerifyData, 1);
verify_data->ret_value = EXIT_FAILURE;
verify_data->loop = g_main_loop_new (NULL, FALSE);
fp_device_open (dev, NULL, (GAsyncReadyCallback) on_device_opened,
verify_data);
g_main_loop_run (verify_data->loop);
return verify_data->ret_value;
}
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