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/*
* Example fingerprint verification program
* Copyright (C) 2007 Daniel Drake <dsd@gentoo.org>
*
* 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
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <libfprint/fprint.h>
struct fp_dscv_dev *discover_device(struct fp_dscv_dev **discovered_devs)
{
struct fp_dscv_dev *ddev = discovered_devs[0];
struct fp_driver *drv;
if (!ddev)
return NULL;
drv = fp_dscv_dev_get_driver(ddev);
printf("Found device claimed by %s driver\n", fp_driver_get_full_name(drv));
return ddev;
}
struct fp_print_data *enroll(struct fp_dev *dev) {
struct fp_print_data *enrolled_print = NULL;
int r;
printf("You will need to successfully scan your finger %d times to "
"complete the process.\n", fp_dev_get_nr_enroll_stages(dev));
do {
sleep(1);
printf("\nScan your finger now.\n");
r = fp_enroll_finger(dev, &enrolled_print);
if (r < 0) {
printf("Enroll failed with error %d\n", r);
return NULL;
}
switch (r) {
case FP_ENROLL_COMPLETE:
printf("Enroll complete!\n");
break;
case FP_ENROLL_FAIL:
printf("Enroll failed, something wen't wrong :(\n");
return NULL;
case FP_ENROLL_PASS:
printf("Enroll stage passed. Yay!\n");
break;
case FP_ENROLL_RETRY:
printf("Didn't quite catch that. Please try again.\n");
break;
case FP_ENROLL_RETRY_TOO_SHORT:
printf("Your swipe was too short, please try again.\n");
break;
case FP_ENROLL_RETRY_CENTER_FINGER:
printf("Didn't catch that, please center your finger on the "
"sensor and try again.\n");
break;
case FP_ENROLL_RETRY_REMOVE_FINGER:
printf("Scan failed, please remove your finger and then try "
"again.\n");
break;
}
} while (r != FP_ENROLL_COMPLETE);
if (!enrolled_print) {
fprintf(stderr, "Enroll complete but no print?\n");
return NULL;
}
printf("Enrollment completed!\n\n");
return enrolled_print;
}
int verify(struct fp_dev *dev, struct fp_print_data *data)
{
int r;
do {
sleep(1);
printf("\nScan your finger now.\n");
r = fp_verify_finger(dev, data);
if (r < 0) {
printf("verification failed with error %d :(\n", r);
return r;
}
switch (r) {
case FP_VERIFY_NO_MATCH:
printf("NO MATCH!\n");
return 0;
case FP_VERIFY_MATCH:
printf("MATCH!\n");
return 0;
case FP_VERIFY_RETRY:
printf("Scan didn't quite work. Please try again.\n");
break;
case FP_VERIFY_RETRY_TOO_SHORT:
printf("Swipe was too short, please try again.\n");
break;
case FP_VERIFY_RETRY_CENTER_FINGER:
printf("Please center your finger on the sensor and try again.\n");
break;
case FP_VERIFY_RETRY_REMOVE_FINGER:
printf("Please remove finger from the sensor and try again.\n");
break;
}
} while (1);
}
int main(void)
{
int r = 1;
struct fp_dscv_dev *ddev;
struct fp_dscv_dev **discovered_devs;
struct fp_dev *dev;
struct fp_print_data *data;
r = fp_init();
if (r < 0) {
fprintf(stderr, "Failed to initialize libfprint\n");
exit(1);
}
fp_set_debug(3);
discovered_devs = fp_discover_devs();
if (!discovered_devs) {
fprintf(stderr, "Could not discover devices\n");
goto out;
}
ddev = discover_device(discovered_devs);
if (!ddev) {
fprintf(stderr, "No devices detected.\n");
goto out;
}
dev = fp_dev_open(ddev);
fp_dscv_devs_free(discovered_devs);
if (!dev) {
fprintf(stderr, "Could not open device.\n");
goto out;
}
printf("Opened device. It's now time to enroll your finger.\n\n");
data = enroll(dev);
if (!data)
goto out_close;
printf("Normally we'd save that print to disk, and recall it at some "
"point later when we want to authenticate the user who just "
"enrolled. In the interests of demonstration, we'll authenticate "
"that user immediately.\n");
do {
char buffer[20];
verify(dev, data);
printf("Verify again? [Y/n]? ");
fgets(buffer, sizeof(buffer), stdin);
if (buffer[0] != '\n' && buffer[0] != 'y' && buffer[0] != 'Y')
break;
} while (1);
fp_print_data_free(data);
out_close:
fp_dev_close(dev);
out:
fp_exit();
return r;
}
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