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#!/usr/bin/env python3
#
# 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.
"""
Utility to transfer a new firmware to the bootloader.
Example usage:
./bin/dfu path/to/firmware.bin
Then reset the Cryptech Alpha board.
"""
import os
import sys
import time
import struct
import serial
import argparse
from binascii import crc32, hexlify
CHUNK_SIZE = 4096
def parse_args():
"""
Parse the command line arguments
"""
parser = argparse.ArgumentParser(description = "Device firmware upgrader",
add_help = True,
formatter_class = argparse.ArgumentDefaultsHelpFormatter,
)
parser.add_argument('--verbose',
dest='verbose',
action='store_true', default=False,
help='Verbose operation',
)
parser.add_argument('--device',
dest='device',
default='/dev/ttyUSB0',
help='Name of management port USB serial device',
)
# positional argument(s)
parser.add_argument('filename')
return parser.parse_args()
def _write(dst, data):
for i in range(len(data)):
dst.write(data[i:i+1])
time.sleep(0.1)
if len(data) == 4:
print("Wrote 0x{}".format(hexlify(data).decode("ascii")))
else:
print("Wrote {!r}".format(data))
def _read(dst, verbose=False):
res = b''
while True:
x = dst.read(1)
if not x:
break
res += x
if res and verbose:
print("Read {!r}".format(res))
return res
def send_file(filename, args):
s = os.stat(filename)
size = s.st_size
src = open(filename, 'rb')
chunk_size = CHUNK_SIZE
print("Waiting for contact with the bootloader on device {!s}, reset the CrypTech Alpha...".format(args.device))
while True:
try:
dst = serial.Serial(args.device, 921600, timeout=0.1)
except serial.SerialException:
time.sleep(0.2)
continue
dst.write(b'\r')
response = _read(dst, args.verbose)
if 'OK' in response:
dst.timeout=2
break
print('\nUploading firmware\n')
crc = 0
counter = 0
# 1. Write size of file (4 bytes)
_write(dst, struct.pack('<I', size))
_read(dst, args.verbose)
# 2. Write file contents while calculating CRC-32
while True:
data = src.read(chunk_size)
if not data:
break
dst.write(data)
print("Wrote {!s} bytes (chunk {!s}/{!s})".format(len(data), counter, int(size / chunk_size)))
# read ACK (a counter of number of 4k chunks received)
while True:
ack_bytes = dst.read(4)
if len(ack_bytes) == 4:
break
print('ERROR: Did not receive an ACK, got {!r}'.format(ack_bytes))
dst.write(b'\r') # eventually get back to the CLI prompt
ack = struct.unpack('<I', ack_bytes)[0]
if ack != counter + 1:
print('ERROR: Did not receive the expected counter as ACK (got {!r}/{!r}, not {!r})'.format(ack, ack_bytes, counter))
flush = dst.read(100)
print('FLUSH data: {!r}'.format(flush))
return False
counter += 1
crc = crc32(data, crc) & 0xffffffff
_read(dst, args.verbose)
# 3. Write CRC-32 (4 bytes)
_write(dst, struct.pack('<I', crc))
if args.verbose:
print('\nFinished - this command might hang now depending on the firmware loaded')
_read(dst, args.verbose)
else:
print('\nFinished uploading firmware')
src.close()
dst.close()
return True
def main(args):
send_file(args.filename, args)
return True
if __name__ == '__main__':
try:
args = parse_args()
if main(args):
sys.exit(0)
sys.exit(1)
except KeyboardInterrupt:
pass
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