Witam!
Zaczynam swoją przygodę z C, używam ubuntu, za pomocą terminala chcę skompilowac program.
Wpisuję polecenie gcc -o nfc-emulate-forum-tag2 nfc-emulate-forum-tag2.c -lnfc
I otrzymuję takie błędy
/tmp/ccYg8DcW.o: In function `nfcforum_tag2_io':
nfc-emulate-forum-tag2.c:(.text+0x91): undefined reference to `print_hex'
nfc-emulate-forum-tag2.c:(.text+0x178): undefined reference to `print_hex'
collect2: error: ld returned 1 exit status
Czym to może być spowodowane ?
Poniżej załączam kod źródłowy:
nfc-emulate-forum-tag2.c
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif // HAVE_CONFIG_H
#include <errno.h>
#include <signal.h>
#include <stdlib.h>
#include <nfc/nfc.h>
#include <nfc/nfc-emulation.h>
#include "utils/nfc-utils.h"
static nfc_device *pnd;
static nfc_context *context;
static void
stop_emulation(int sig)
{
(void)sig;
if (pnd != NULL) {
nfc_abort_command(pnd);
} else {
nfc_exit(context);
exit(EXIT_FAILURE);
}
}
static uint8_t __nfcforum_tag2_memory_area[] = {
0x00, 0x00, 0x00, 0x00, // Block 0
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0xFF, 0xFF, // Block 2 (Static lock bytes: CC area and data area are read-only locked)
0xE1, 0x10, 0x06, 0x0F, // Block 3 (CC - NFC-Forum Tag Type 2 version 1.0, Data area (from block 4 to the end) is 48 bytes, Read-only mode)
0x03, 33, 0xd1, 0x02, // Block 4 (NDEF)
0x1c, 0x53, 0x70, 0x91,
0x01, 0x09, 0x54, 0x02,
0x65, 0x6e, 0x4c, 0x69,
0x62, 0x6e, 0x66, 0x63,
0x51, 0x01, 0x0b, 0x55,
0x03, 0x6c, 0x69, 0x62,
0x6e, 0x66, 0x63, 0x2e,
0x6f, 0x72, 0x67, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
};
#define READ 0x30
#define WRITE 0xA2
#define SECTOR_SELECT 0xC2
#define HALT 0x50
static int
nfcforum_tag2_io(struct nfc_emulator *emulator, const uint8_t *data_in, const size_t data_in_len, uint8_t *data_out, const size_t data_out_len)
{
int res = 0;
uint8_t *nfcforum_tag2_memory_area = (uint8_t *)(emulator->user_data);
printf(" In: ");
print_hex(data_in, data_in_len);
switch (data_in[0]) {
case READ:
if (data_out_len >= 16) {
memcpy(data_out, nfcforum_tag2_memory_area + (data_in[1] * 4), 16);
res = 16;
} else {
res = -ENOSPC;
}
break;
case HALT:
printf("HALT sent\n");
res = -ECONNABORTED;
break;
default:
printf("Unknown command: 0x%02x\n", data_in[0]);
res = -ENOTSUP;
}
if (res < 0) {
ERR("%s (%d)", strerror(-res), -res);
} else {
printf(" Out: ");
print_hex(data_out, res);
}
return res;
}
int
main(int argc, char *argv[])
{
(void)argc;
(void)argv;
nfc_target nt = {
.nm = {
.nmt = NMT_ISO14443A,
.nbr = NBR_UNDEFINED, // Will be updated by nfc_target_init()
},
.nti = {
.nai = {
.abtAtqa = { 0x00, 0x04 },
.abtUid = { 0x08, 0x00, 0xb0, 0x0b },
.szUidLen = 4,
.btSak = 0x00,
.szAtsLen = 0,
},
}
};
struct nfc_emulation_state_machine state_machine = {
.io = nfcforum_tag2_io
};
struct nfc_emulator emulator = {
.target = &nt,
.state_machine = &state_machine,
.user_data = __nfcforum_tag2_memory_area,
};
signal(SIGINT, stop_emulation);
nfc_init(&context);
if (context == NULL) {
ERR("Unable to init libnfc (malloc)");
exit(EXIT_FAILURE);
}
pnd = nfc_open(context, NULL);
if (pnd == NULL) {
ERR("Unable to open NFC device");
nfc_exit(context);
exit(EXIT_FAILURE);
}
printf("NFC device: %s opened\n", nfc_device_get_name(pnd));
printf("Emulating NDEF tag now, please touch it with a second NFC device\n");
if (nfc_emulate_target(pnd, &emulator, 0) < 0) {
nfc_perror(pnd, argv[0]);
nfc_close(pnd);
nfc_exit(context);
exit(EXIT_FAILURE);
}
nfc_close(pnd);
nfc_exit(context);
exit(EXIT_SUCCESS);
}
Oraz plik nagłówkowy utils/nfc-utils.h który moim zdaniem może mieć coś wspólnego z tym błędem.
#ifndef _EXAMPLES_NFC_UTILS_H_
# define _EXAMPLES_NFC_UTILS_H_
# include <stdlib.h>
# include <string.h>
# include <err.h>
/**
* @macro DBG
* @brief Print a message of standard output only in DEBUG mode
*/
#ifdef DEBUG
# define DBG(...) do { \
warnx ("DBG %s:%d", __FILE__, __LINE__); \
warnx (" " __VA_ARGS__ ); \
} while (0)
#else
# define DBG(...) {}
#endif
/**
* @macro WARN
* @brief Print a warn message
*/
#ifdef DEBUG
# define WARN(...) do { \
warnx ("WARNING %s:%d", __FILE__, __LINE__); \
warnx (" " __VA_ARGS__ ); \
} while (0)
#else
# define WARN(...) warnx ("WARNING: " __VA_ARGS__ )
#endif
/**
* @macro ERR
* @brief Print a error message
*/
#ifdef DEBUG
# define ERR(...) do { \
warnx ("ERROR %s:%d", __FILE__, __LINE__); \
warnx (" " __VA_ARGS__ ); \
} while (0)
#else
# define ERR(...) warnx ("ERROR: " __VA_ARGS__ )
#endif
#ifndef MIN
#define MIN(a,b) (((a) < (b)) ? (a) : (b))
#endif
#ifndef MAX
#define MAX(a,b) (((a) > (b)) ? (a) : (b))
#endif
uint8_t oddparity(const uint8_t bt);
void oddparity_bytes_ts(const uint8_t *pbtData, const size_t szLen, uint8_t *pbtPar);
void print_hex(const uint8_t *pbtData, const size_t szLen);
void print_hex_bits(const uint8_t *pbtData, const size_t szBits);
void print_hex_par(const uint8_t *pbtData, const size_t szBits, const uint8_t *pbtDataPar);
void print_nfc_target(const nfc_target *pnt, bool verbose);
#endif
Ta kompilacja to próba wykorzystania jednego z przykładów projektu libnfc.
Libnfc instalowałem zgodnie z instukcją, instalacja przebiegła poprawnie.
Próbowałem przeprowadzić kompilację na systemie Fedora 24 gdzie Libnfc jest domyślnie zainstalowane, również bezskutecznie.