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/*
* dfu.c
* ------------
* Receive new firmware from MGMT UART and write it to STM32 internal flash.
*
* Copyright (c) 2016, NORDUnet A/S All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of the NORDUnet nor the names of its contributors may
* be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/* Rename both CMSIS HAL_OK and libhal HAL_OK to disambiguate */
#define HAL_OK CMSIS_HAL_OK
#include "dfu.h"
#include "stm-led.h"
#include "stm-uart.h"
#include "stm-flash.h"
#undef HAL_OK
#define HAL_OK LIBHAL_OK
#include "hal.h"
#include "hal_internal.h"
#undef HAL_OK
#include <string.h>
static int getline(char *buf, int len)
{
int i;
uint8_t c;
for (i = 0; i < len; ++i) {
if (uart_recv_char2(STM_UART_MGMT, &c, HAL_MAX_DELAY) != CMSIS_HAL_OK)
return -1;
if (c == '\r') {
buf[i] = '\0';
break;
}
buf[i] = c;
}
return i;
}
static void uart_flush(void)
{
uint8_t c;
while (uart_recv_char2(STM_UART_MGMT, &c, 0) == CMSIS_HAL_OK) { ; }
}
static int do_login(void)
{
char username[8];
char pin[hal_rpc_max_pin_length];
hal_client_handle_t client = { -1 };
hal_user_t user;
int n;
uart_flush();
uart_send_string2(STM_UART_MGMT, "\r\nUsername: ");
if (getline(username, sizeof(username)) <= 0)
return -1;
if (strcmp(username, "wheel") == 0)
user = HAL_USER_WHEEL;
else if (strcmp(username, "so") == 0)
user = HAL_USER_SO;
else if (strcmp(username, "user") == 0)
user = HAL_USER_NORMAL;
else
user = HAL_USER_NONE;
uart_flush();
uart_send_string2(STM_UART_MGMT, "\r\nPassword: ");
if ((n = getline(pin, sizeof(pin))) <= 0)
return -1;
uart_flush();
hal_ks_init_read_only_pins_only();
if (hal_rpc_login(client, user, pin, n) != LIBHAL_OK) {
uart_send_string2(STM_UART_MGMT, "\r\nAccess denied\r\n");
return -1;
}
return 0;
}
int dfu_receive_firmware(void)
{
uint32_t offset = DFU_FIRMWARE_ADDR, n = DFU_UPLOAD_CHUNK_SIZE;
hal_crc32_t crc = 0, my_crc = hal_crc32_init();
uint32_t filesize = 0, counter = 0;
uint8_t buf[DFU_UPLOAD_CHUNK_SIZE];
if (do_login() != 0)
return -1;
/* Fake the CLI */
uart_send_string2(STM_UART_MGMT, "\r\ncryptech> ");
char cmd[64];
if (getline(cmd, sizeof(cmd)) <= 0)
return -1;
if (strcmp(cmd, "firmware upload") != 0) {
uart_send_string2(STM_UART_MGMT, "\r\nInvalid command \"");
uart_send_string2(STM_UART_MGMT, cmd);
uart_send_string2(STM_UART_MGMT, "\"\r\n");
return -1;
}
uart_send_string2(STM_UART_MGMT, "OK, write size (4 bytes), data in 4096 byte chunks, CRC-32 (4 bytes)\r\n");
/* Read file size (4 bytes) */
uart_receive_bytes(STM_UART_MGMT, (void *) &filesize, sizeof(filesize), 10000);
if (filesize < 512 || filesize > DFU_FIRMWARE_END_ADDR - DFU_FIRMWARE_ADDR) {
uart_send_string2(STM_UART_MGMT, "Invalid filesize ");
uart_send_number2(STM_UART_MGMT, filesize, 1, 10);
uart_send_string2(STM_UART_MGMT, "\r\n");
return -1;
}
HAL_FLASH_Unlock();
uart_send_string2(STM_UART_MGMT, "Send ");
uart_send_number2(STM_UART_MGMT, filesize, 1, 10);
uart_send_string2(STM_UART_MGMT, " bytes of data\r\n");
while (filesize) {
/* By initializing buf to the same value that erased flash has (0xff), we don't
* have to try and be smart when writing the last page of data to the memory.
*/
memset(buf, 0xff, sizeof(buf));
if (filesize < n) {
n = filesize;
}
if (uart_receive_bytes(STM_UART_MGMT, (void *) buf, n, 10000) != CMSIS_HAL_OK) {
return -2;
}
filesize -= n;
/* After reception of a chunk but before ACKing we have "all" the time in the world to
* calculate CRC and write it to flash.
*/
my_crc = hal_crc32_update(my_crc, buf, n);
stm_flash_write32(offset, (uint32_t *)buf, sizeof(buf)/4);
offset += DFU_UPLOAD_CHUNK_SIZE;
/* ACK this chunk by sending the current chunk counter (4 bytes) */
counter++;
uart_send_bytes(STM_UART_MGMT, (void *) &counter, 4);
led_toggle(LED_BLUE);
}
my_crc = hal_crc32_finalize(my_crc);
HAL_FLASH_Lock();
uart_send_string2(STM_UART_MGMT, "Send CRC-32\r\n");
/* The sending side will now send its calculated CRC-32 */
uart_receive_bytes(STM_UART_MGMT, (void *) &crc, sizeof(crc), 10000);
uart_send_string2(STM_UART_MGMT, "CRC-32 0x");
uart_send_number2(STM_UART_MGMT, crc, 1, 16);
uart_send_string2(STM_UART_MGMT, ", calculated CRC 0x");
uart_send_number2(STM_UART_MGMT, my_crc, 1, 16);
if (crc == my_crc) {
uart_send_string2(STM_UART_MGMT, "CRC checksum MATCHED\r\n");
return 0;
} else {
uart_send_string2(STM_UART_MGMT, "CRC checksum did NOT match\r\n");
}
led_on(LED_RED);
led_on(LED_YELLOW);
/* Better to erase the known bad firmware */
stm_flash_erase_sectors(DFU_FIRMWARE_ADDR, DFU_FIRMWARE_END_ADDR);
led_off(LED_YELLOW);
return 0;
}
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