libfreefare/examples/mifare-ultralight-info.c

/*-
 * Copyright (C) 2012, Romain Tartiere.
 * 
 * This program 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 3 of the License, or (at your
 * option) any later version.
 * 
 * This program 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 General Public License for
 * more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 */
#include <err.h>
#include <stdlib.h>

#include <nfc/nfc.h>

#include <freefare.h>

int
main (int argc, char *argv[])
{
    int error = EXIT_SUCCESS;
    nfc_device *device = NULL;
    FreefareTag *tags = NULL;

    if (argc > 1)
	errx (EXIT_FAILURE, "usage: %s", argv[0]);

    nfc_connstring devices[8];
    size_t device_count;

    nfc_context *context;
    nfc_init (&context);
    if (context == NULL)
	errx(EXIT_FAILURE, "Unable to init libnfc (malloc)");

    device_count = nfc_list_devices (context, devices, sizeof (devices) / sizeof (*devices));
    if (device_count <= 0)
	errx (EXIT_FAILURE, "No NFC device found");

    for (size_t d = 0; d < device_count; d++) {
	if (!(device = nfc_open (context, devices[d]))) {
	    warnx ("nfc_open() failed.");
	    error = EXIT_FAILURE;
	    continue;
	}

        if (!(tags = freefare_get_tags (device))) {
	    nfc_close (device);
	    errx (EXIT_FAILURE, "Error listing tags.");
	}

	for (int i = 0; (!error) && tags[i]; i++) {
	    switch (freefare_get_tag_type (tags[i])) {
	    case MIFARE_ULTRALIGHT:
	    case MIFARE_ULTRALIGHT_C:
		break;
	    default:
		continue;
	    }

	    char *tag_uid = freefare_get_tag_uid (tags[i]);
	    printf ("Tag with UID %s is a %s\n", tag_uid, freefare_get_tag_friendly_name (tags[i]));
	    if (freefare_get_tag_type (tags[i]) == MIFARE_ULTRALIGHT_C) {
		FreefareTag tag = tags[i];
		int res;
		MifareDESFireKey key;
		uint8_t key1_3des_data[16] = { 0x49, 0x45, 0x4D, 0x4B, 0x41, 0x45, 0x52, 0x42, 0x21, 0x4E, 0x41, 0x43, 0x55, 0x4F, 0x59, 0x46 };
		key = mifare_desfire_3des_key_new (key1_3des_data);
		if (mifare_ultralight_connect (tag) < 0)
		    errx (EXIT_FAILURE, "Error connecting to tag.");
		res = mifare_ultralightc_authenticate (tag, key);
		printf ("Authentication with default key: %s\n", res ? "fail" : "success");
		mifare_desfire_key_free (key);
		mifare_ultralight_disconnect (tag);
            }
	    free (tag_uid);
	}

	freefare_free_tags (tags);
	nfc_close (device);
    }

    nfc_exit (context);
    exit(error);
}