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restore_dump.c
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restore_dump.c
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/*
* Copyright 2019-2020 Giacomo Ferretti
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <nfc/nfc.h>
#include <sys/stat.h>
#include <stdbool.h>
#include "logging.h"
#include "nfc_utils.h"
static void print_usage(const char *executable) {
printf("Usage: %s <dump.bin> [-h] [-v] [-y] [-t x4k|512]\n", executable);
printf("\nNecessary arguments:\n");
printf(" <dump.bin> path to the dump file\n");
printf("\nOptions:\n");
printf(" -h show this help message\n");
printf(" -v enable verbose - print debugging data\n");
printf(" -y answer YES to all questions\n");
printf(" -t x4k|512 select SRIX4K or SRI512 tag type [default: x4k]\n");
}
int main(int argc, char *argv[], char *envp[]) {
// Options
uint16_t eeprom_size = SRIX4K_EEPROM_SIZE;
uint8_t eeprom_blocks_amount = SRIX4K_EEPROM_BLOCKS;
bool skip_confirmation = false;
// Parse options
int opt = 0;
while ((opt = getopt(argc, argv, "hvyt:")) != -1) {
switch (opt) {
case 'v':
set_verbose(true);
break;
case 'y':
skip_confirmation = true;
break;
case 't':
if (strcmp(optarg, "512") == 0) {
eeprom_size = SRI512_EEPROM_SIZE;
eeprom_blocks_amount = SRI512_EEPROM_BLOCKS;
}
break;
default:
case 'h':
print_usage(argv[0]);
exit(0);
}
}
// Check arguments
if ((argc - optind) < 1) {
lerror("You need to specify a path for <dump.bin>.\n\n");
print_usage(argv[0]);
exit(1);
}
// Initialize NFC
nfc_context *context = NULL;
nfc_device *reader = NULL;
nfc_init(&context);
if (context == NULL) {
lerror("Unable to init libnfc. Exiting...\n");
exit(1);
}
// Display libnfc version
lverbose("libnfc version: %s\n", nfc_version());
// Search for readers
lverbose("Searching for readers... ");
nfc_connstring connstrings[MAX_DEVICE_COUNT] = {};
size_t num_readers = nfc_list_devices(context, connstrings, MAX_DEVICE_COUNT);
lverbose("found %zu.\n", num_readers);
// Check if no readers are available
if (num_readers == 0) {
lerror("No readers available. Exiting...\n");
close_nfc(context, reader);
exit(1);
}
// Print out readers
for (unsigned int i = 0; i < num_readers; i++) {
if (i == num_readers - 1) {
lverbose("└── ");
} else {
lverbose("├── ");
}
lverbose("[%d] %s\n", i, connstrings[i]);
}
lverbose("Opening %s...\n", connstrings[0]);
// Open first reader
reader = nfc_open(context, connstrings[0]);
if (reader == NULL) {
lerror("Unable to open NFC device. Exiting...\n");
close_nfc(context, reader);
exit(1);
}
// Set opened NFC device to initiator mode
if (nfc_initiator_init(reader) < 0) {
lerror("nfc_initiator_init => %s\n", nfc_strerror(reader));
close_nfc(context, reader);
exit(1);
}
lverbose("NFC reader: %s\n", nfc_device_get_name(reader));
nfc_target target_key[MAX_TARGET_COUNT];
/*
* This is a known bug from libnfc.
* To read ISO14443B2SR you have to initiate first ISO14443B to configure internal registers.
*
* https://github.com/nfc-tools/libnfc/issues/436#issuecomment-326686914
*/
lverbose("Searching for ISO14443B targets... found %d.\n", nfc_initiator_list_passive_targets(reader, nmISO14443B, target_key, MAX_TARGET_COUNT));
lverbose("Searching for ISO14443B2SR targets...");
int ISO14443B2SR_targets = nfc_initiator_list_passive_targets(reader, nmISO14443B2SR, target_key, MAX_TARGET_COUNT);
lverbose(" found %d.\n", ISO14443B2SR_targets);
// Check for tags
if (ISO14443B2SR_targets == 0) {
printf("Waiting for tag...\n");
// Infinite select for tag
if (nfc_initiator_select_passive_target(reader, nmISO14443B2SR, NULL, 0, target_key) <= 0) {
lerror("nfc_initiator_select_passive_target => %s\n", nfc_strerror(reader));
close_nfc(context, reader);
exit(1);
}
}
char *file_path = argv[optind];
uint8_t *dump_bytes = malloc(sizeof(uint8_t) * eeprom_size);
// Open file
lverbose("Reading \"%s\"...\n", file_path);
FILE *fp = fopen(file_path, "rb");
if (fp == NULL) {
lerror("Cannot open \"%s\". Exiting...\n", file_path);
exit(1);
}
// Check file size
int fd = fileno(fp);
struct stat file_stat;
if (fstat(fd, &file_stat) < 0) {
lerror("Error doing fstat. Exiting...\n");
exit(1);
}
if (file_stat.st_size < eeprom_size) {
lerror("File wrong size, expected %llu but read %llu. Exiting...\n", eeprom_size, file_stat.st_size);
exit(1);
}
// Read file
fseek(fp, 0, SEEK_SET);
if (fread(dump_bytes, eeprom_size, 1, fp) != 1) {
lerror("Error encountered while reading file. Exiting...\n");
exit(1);
}
fclose(fp);
// Read EEPROM
uint8_t *eeprom_bytes = malloc(sizeof(uint8_t) * eeprom_size);
lverbose("Reading %d blocks...\n", eeprom_blocks_amount);
for (int i = 0; i < eeprom_blocks_amount; i++) {
uint8_t *current_block = eeprom_bytes + (i * 4);
uint8_t block_bytes_read = nfc_srix_read_block(reader, current_block, i);
// Check for errors
if (block_bytes_read != 4) {
lerror("Error while reading block %d. Exiting...\n", i);
lverbose("Received %d bytes instead of 4.\n", block_bytes_read);
close_nfc(context, reader);
exit(1);
}
}
// Preview write
bool is_equal = true;
for (uint8_t i = 7; i < eeprom_blocks_amount; i++) {
uint32_t dump_block = dump_bytes[(i*4)+0] << 24u | dump_bytes[(i*4)+1] << 16u | dump_bytes[(i*4)+2] << 8u | dump_bytes[(i*4)+3];
uint32_t eeprom_block = eeprom_bytes[(i*4)+0] << 24u | eeprom_bytes[(i*4)+1] << 16u | eeprom_bytes[(i*4)+2] << 8u | eeprom_bytes[(i*4)+3];
if (dump_block != eeprom_block) {
is_equal = false;
printf("[%02X] %08X -> %08X\n", i, dump_block, eeprom_block);
}
}
if (!is_equal) {
// Ask for confirmation
if (!skip_confirmation) {
printf("This action is irreversible.\n");
printf("Are you sure? [Y/N] ");
char c = 'n';
scanf(" %c", &c);
if (c != 'Y' && c != 'y') {
printf("Exiting...\n");
exit(0);
}
}
// Ask for OTP area
bool write_otp_area = true;
if (!skip_confirmation) {
printf("This action is irreversible.\n");
printf("Are you sure? [Y/N] ");
char c = 'n';
scanf(" %c", &c);
if (c != 'Y' && c != 'y') {
write_otp_area = false;
}
}
for (uint8_t i = 0; i < eeprom_blocks_amount; i++) {
// Skip critical sectors
if (!write_otp_area) {
continue;
}
uint32_t dump_block = dump_bytes[(i*4)+0] << 24u | dump_bytes[(i*4)+1] << 16u | dump_bytes[(i*4)+2] << 8u | dump_bytes[(i*4)+3];
uint32_t eeprom_block = eeprom_bytes[(i*4)+0] << 24u | eeprom_bytes[(i*4)+1] << 16u | eeprom_bytes[(i*4)+2] << 8u | eeprom_bytes[(i*4)+3];
if (dump_block != eeprom_block) {
nfc_write_block(reader, dump_block, i);
}
}
} else {
printf("Tag already restored.\n");
}
// Close NFC
close_nfc(context, reader);
return 0;
}