245 lines
6.5 KiB
C
245 lines
6.5 KiB
C
/*-
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* Copyright (C) 2011, Romain Tartiere, Romuald Conty.
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*
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* This program is free software: you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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*/
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/*
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* This implementation was written based on information provided by the
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* following documents:
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*
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* Mifare Std as NFC Forum Enabled,
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* Extensions for Mifare standard 1k/4k as NFC Forum Enable Tag
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* Application note
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* Revision 1.1 — 21 August 2007
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*
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* NXP Type MF1K/4K Tag Operation, NXP Semiconductors [ANNFC1K4K]
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* Application Note
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* Revision 1.1 — 21 August 2007
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* Document Identifier 130410
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*/
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#include "config.h"
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#include <err.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <strings.h>
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#include <unistd.h>
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#include <nfc/nfc.h>
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#include <freefare.h>
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#define MIN(a,b) ((a < b) ? a: b)
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struct {
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bool interactive;
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} read_options = {
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.interactive = true
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};
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static void
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usage(char *progname)
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{
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fprintf (stderr, "usage: %s -o FILE\n", progname);
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fprintf (stderr, "\nOptions:\n");
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fprintf (stderr, " -y Do not ask for confirmation\n");
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fprintf (stderr, " -o Extract NDEF message if available in FILE\n");
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}
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int
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main(int argc, char *argv[])
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{
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int error = 0;
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nfc_device *device = NULL;
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FreefareTag *tags = NULL;
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Mad mad;
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int ch;
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char *ndef_output = NULL;
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while ((ch = getopt (argc, argv, "hyo:")) != -1) {
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switch (ch) {
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case 'h':
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usage(argv[0]);
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exit (EXIT_SUCCESS);
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break;
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case 'y':
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read_options.interactive = false;
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break;
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case 'o':
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ndef_output = optarg;
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break;
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case '?':
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if (optopt == 'o')
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fprintf (stderr, "Option -%c requires an argument.\n", optopt);
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/* FALLTHROUGH */
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default:
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usage (argv[0]);
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exit (EXIT_FAILURE);
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}
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}
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if (ndef_output == NULL) {
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usage (argv[0]);
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exit (EXIT_FAILURE);
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}
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FILE* message_stream = NULL;
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FILE* ndef_stream = NULL;
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if ((strlen (ndef_output) == 1) && (ndef_output[0] == '-')) {
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message_stream = stderr;
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ndef_stream = stdout;
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} else {
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message_stream = stdout;
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ndef_stream = fopen(ndef_output, "wb");
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if (!ndef_stream) {
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fprintf (stderr, "Could not open file %s.\n", ndef_output);
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exit (EXIT_FAILURE);
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}
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}
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nfc_connstring devices[8];
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size_t device_count;
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nfc_context *context;
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nfc_init (&context);
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if (context == NULL)
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errx(EXIT_FAILURE, "Unable to init libnfc (malloc)");
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device_count= nfc_list_devices (context, devices, 8);
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if (device_count <= 0)
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errx (EXIT_FAILURE, "No NFC device found.");
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for (size_t d = 0; d < device_count; d++) {
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device = nfc_open (context, devices[d]);
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if (!device) {
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warnx ("nfc_open() failed.");
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error = EXIT_FAILURE;
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continue;
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}
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tags = freefare_get_tags (device);
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if (!tags) {
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nfc_close (device);
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errx (EXIT_FAILURE, "Error listing MIFARE classic tag.");
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}
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for (int i = 0; (!error) && tags[i]; i++) {
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switch (freefare_get_tag_type (tags[i])) {
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case MIFARE_CLASSIC_1K:
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case MIFARE_CLASSIC_4K:
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break;
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default:
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continue;
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}
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char *tag_uid = freefare_get_tag_uid (tags[i]);
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char buffer[BUFSIZ];
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fprintf (message_stream, "Found %s with UID %s. ", freefare_get_tag_friendly_name (tags[i]), tag_uid);
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bool read_ndef = true;
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if (read_options.interactive) {
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fprintf (message_stream, "Read NDEF [yN] ");
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fgets (buffer, BUFSIZ, stdin);
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read_ndef = ((buffer[0] == 'y') || (buffer[0] == 'Y'));
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} else {
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fprintf (message_stream, "\n");
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}
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if (read_ndef) {
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// NFCForum card has a MAD, load it.
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if (0 == mifare_classic_connect (tags[i])) {
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} else {
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nfc_perror (device, "mifare_classic_connect");
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error = EXIT_FAILURE;
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goto error;
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}
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if ((mad = mad_read (tags[i]))) {
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// Dump the NFCForum application using MAD information
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uint8_t buffer[4096];
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ssize_t len;
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if ((len = mifare_application_read (tags[i], mad, mad_nfcforum_aid, buffer, sizeof(buffer), mifare_classic_nfcforum_public_key_a, MFC_KEY_A)) != -1) {
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uint8_t tlv_type;
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uint16_t tlv_data_len;
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uint8_t * tlv_data;
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uint8_t * pbuffer = buffer;
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decode_tlv:
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tlv_data = tlv_decode (pbuffer, &tlv_type, &tlv_data_len);
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switch (tlv_type) {
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case 0x00:
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fprintf (message_stream, "NFC Forum application contains a \"NULL TLV\", Skipping...\n"); // According to [ANNFC1K4K], we skip this Tag to read further TLV blocks.
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pbuffer += tlv_record_length(pbuffer, NULL, NULL);
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if (pbuffer >= buffer + sizeof(buffer)) {
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error = EXIT_FAILURE;
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goto error;
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}
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goto decode_tlv;
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break;
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case 0x03:
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fprintf (message_stream, "NFC Forum application contains a \"NDEF Message TLV\".\n");
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break;
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case 0xFD:
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fprintf (message_stream, "NFC Forum application contains a \"Proprietary TLV\", Skipping...\n"); // According to [ANNFC1K4K], we can skip this TLV to read further TLV blocks.
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pbuffer += tlv_record_length(pbuffer, NULL, NULL);
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if (pbuffer >= buffer + sizeof(buffer)) {
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error = EXIT_FAILURE;
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goto error;
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}
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goto decode_tlv;
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break;
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case 0xFE:
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fprintf (stderr, "NFC Forum application contains a \"Terminator TLV\", no available data.\n");
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error = EXIT_FAILURE;
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goto error;
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break;
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default:
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fprintf (stderr, "NFC Forum application contains an invalid TLV.\n");
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error = EXIT_FAILURE;
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goto error;
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break;
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}
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if (fwrite (tlv_data, 1, tlv_data_len, ndef_stream) != tlv_data_len) {
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fprintf (stderr, "Could not write to file.\n");
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error = EXIT_FAILURE;
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goto error;
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}
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free (tlv_data);
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} else {
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fprintf (stderr, "No NFC Forum application.\n");
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error = EXIT_FAILURE;
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goto error;
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}
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} else {
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fprintf (stderr, "No MAD detected.\n");
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error = EXIT_FAILURE;
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goto error;
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}
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free (mad);
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}
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error:
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free (tag_uid);
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}
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fclose (ndef_stream);
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freefare_free_tags (tags);
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nfc_close (device);
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}
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nfc_exit (context);
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exit (error);
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}
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