208 lines
6.5 KiB
C
208 lines
6.5 KiB
C
/*-
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* Public platform independent Near Field Communication (NFC) library
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*
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* Copyright (C) 2009, 2010, Roel Verdult, 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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* @file nfc-relay.c
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* @brief Relay example using two devices.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif /* HAVE_CONFIG_H */
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <signal.h>
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#include <nfc/nfc.h>
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#include <nfc/nfc-messages.h>
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#include "nfc-utils.h"
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#define MAX_FRAME_LEN 264
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#define MAX_DEVICE_COUNT 2
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static byte_t abtReaderRx[MAX_FRAME_LEN];
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static byte_t abtReaderRxPar[MAX_FRAME_LEN];
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static size_t szReaderRxBits;
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static byte_t abtTagRx[MAX_FRAME_LEN];
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static byte_t abtTagRxPar[MAX_FRAME_LEN];
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static size_t szTagRxBits;
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static nfc_device_t *pndReader;
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static nfc_device_t *pndTag;
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static bool quitting = false;
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void
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intr_hdlr (void)
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{
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printf ("\nQuitting...\n");
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quitting = true;
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return;
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}
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void
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print_usage (char *argv[])
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{
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printf ("Usage: %s [OPTIONS]\n", argv[0]);
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printf ("Options:\n");
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printf ("\t-h\tHelp. Print this message.\n");
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printf ("\t-q\tQuiet mode. Suppress output of READER and EMULATOR data (improves timing).\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 arg;
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bool quiet_output = false;
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size_t szFound;
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nfc_device_desc_t *pnddDevices;
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const char *acLibnfcVersion = nfc_version ();
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// Get commandline options
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for (arg = 1; arg < argc; arg++) {
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if (0 == strcmp (argv[arg], "-h")) {
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print_usage (argv);
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return EXIT_SUCCESS;
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} else if (0 == strcmp (argv[arg], "-q")) {
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INFO ("%s", "Quiet mode.");
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quiet_output = true;
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} else {
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ERR ("%s is not supported option.", argv[arg]);
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print_usage (argv);
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return EXIT_FAILURE;
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}
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}
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// Display libnfc version
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printf ("%s use libnfc %s\n", argv[0], acLibnfcVersion);
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#ifdef WIN32
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signal (SIGINT, (void (__cdecl *) (int)) intr_hdlr);
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#else
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signal (SIGINT, (void (*)()) intr_hdlr);
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#endif
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// Allocate memory to put the result of available devices listing
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if (!(pnddDevices = malloc (MAX_DEVICE_COUNT * sizeof (*pnddDevices)))) {
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fprintf (stderr, "malloc() failed\n");
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return EXIT_FAILURE;
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}
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// List available devices
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nfc_list_devices (pnddDevices, MAX_DEVICE_COUNT, &szFound);
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if (szFound < 2) {
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ERR ("%zd device found but two connected devices are needed to relay NFC.", szFound);
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return EXIT_FAILURE;
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}
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// Try to open the NFC emulator device
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pndTag = nfc_connect (&(pnddDevices[0]));
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if (pndTag == NULL) {
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printf ("Error connecting NFC emulator device\n");
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return EXIT_FAILURE;
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}
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printf ("Hint: tag <---> initiator (relay) <---> target (relay) <---> original reader\n\n");
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printf ("Connected to the NFC emulator device: %s\n", pndTag->acName);
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printf ("[+] Try to break out the auto-emulation, this requires a second reader!\n");
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printf ("[+] To do this, please send any command after the anti-collision\n");
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printf ("[+] For example, send a RATS command or use the \"nfc-anticol\" tool\n");
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nfc_target_t nt = {
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.nm.nmt = NMT_ISO14443A,
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.nm.nbr = NBR_UNDEFINED,
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.nti.nai.abtAtqa = { 0x04, 0x00 },
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.nti.nai.abtUid = { 0xde, 0xad, 0xbe, 0xef },
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.nti.nai.btSak = 0x20,
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.nti.nai.szUidLen = 4,
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.nti.nai.szAtsLen = 0,
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};
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if (!nfc_target_init (pndTag, NTM_PASSIVE_ONLY, &nt, abtReaderRx, &szReaderRxBits)) {
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ERR ("%s", "Initialization of NFC emulator failed");
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nfc_disconnect (pndTag);
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return EXIT_FAILURE;
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}
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printf ("%s", "Configuring emulator settings...");
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if (!nfc_configure (pndTag, NDO_HANDLE_CRC, false) ||
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!nfc_configure (pndTag, NDO_HANDLE_PARITY, false) || !nfc_configure (pndTag, NDO_ACCEPT_INVALID_FRAMES, true)) {
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nfc_perror (pndTag, "nfc_configure");
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exit (EXIT_FAILURE);
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}
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printf ("%s", "Done, emulated tag is initialized");
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// Try to open the NFC reader
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pndReader = nfc_connect (&(pnddDevices[1]));
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printf ("Connected to the NFC reader device: %s", pndReader->acName);
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printf ("%s", "Configuring NFC reader settings...");
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nfc_initiator_init (pndReader);
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if (!nfc_configure (pndReader, NDO_HANDLE_CRC, false) ||
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!nfc_configure (pndReader, NDO_HANDLE_PARITY, false) ||
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!nfc_configure (pndReader, NDO_ACCEPT_INVALID_FRAMES, true)) {
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nfc_perror (pndReader, "nfc_configure");
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exit (EXIT_FAILURE);
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}
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printf ("%s", "Done, relaying frames now!");
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while (!quitting) {
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// Test if we received a frame from the reader
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if (nfc_target_receive_bits (pndTag, abtReaderRx, &szReaderRxBits, abtReaderRxPar)) {
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// Drop down the field before sending a REQA command and start a new session
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if (szReaderRxBits == 7 && abtReaderRx[0] == 0x26) {
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// Drop down field for a very short time (original tag will reboot)
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if (!nfc_configure (pndReader, NDO_ACTIVATE_FIELD, false)) {
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nfc_perror (pndReader, "nfc_configure");
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exit (EXIT_FAILURE);
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}
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if (!quiet_output)
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printf ("\n");
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if (!nfc_configure (pndReader, NDO_ACTIVATE_FIELD, true)) {
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nfc_perror (pndReader, "nfc_configure");
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exit (EXIT_FAILURE);
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}
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}
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// Print the reader frame to the screen
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if (!quiet_output) {
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printf ("R: ");
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print_hex_par (abtReaderRx, szReaderRxBits, abtReaderRxPar);
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}
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// Forward the frame to the original tag
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if (nfc_initiator_transceive_bits
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(pndReader, abtReaderRx, szReaderRxBits, abtReaderRxPar, abtTagRx, &szTagRxBits, abtTagRxPar)) {
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// Redirect the answer back to the reader
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if (!nfc_target_send_bits (pndTag, abtTagRx, szTagRxBits, abtTagRxPar)) {
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nfc_perror (pndTag, "nfc_target_send_bits");
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exit (EXIT_FAILURE);
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}
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// Print the tag frame to the screen
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if (!quiet_output) {
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printf ("T: ");
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print_hex_par (abtTagRx, szTagRxBits, abtTagRxPar);
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}
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}
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}
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}
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nfc_disconnect (pndTag);
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nfc_disconnect (pndReader);
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exit (EXIT_SUCCESS);
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}
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