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246 lines
8.0 KiB
246 lines
8.0 KiB
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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# To use python v2.7 change the first line to:
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#!/usr/bin/env python
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# Copyright (C) 2015 Bernhard Ehlers
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU 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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iou_import imports startup/private configuration into IOU NVRAM file.
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usage: iou_import [-h] [-c size] NVRAM startup-config [private-config]
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positional arguments:
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NVRAM NVRAM file
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startup-config startup configuration
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private-config private configuration
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optional arguments:
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-h, --help show this help message and exit
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-c size, --create size
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create NVRAM file, size in kByte
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"""
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import argparse
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import sys
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# extract 16 bit unsigned int from data
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def get_uint16(data, off):
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return data[off] << 8 | data[off + 1]
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# extract 32 bit unsigned int from data
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def get_uint32(data, off):
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return data[off] << 24 | data[off + 1] << 16 | data[off + 2] << 8 | data[off + 3]
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# insert 16 bit unsigned int into data
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def put_uint16(data, off, value):
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data[off] = (value >> 8) & 0xff
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data[off + 1] = value & 0xff
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# insert 32 bit unsigned int into data
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def put_uint32(data, off, value):
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data[off] = (value >> 24) & 0xff
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data[off + 1] = (value >> 16) & 0xff
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data[off + 2] = (value >> 8) & 0xff
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data[off + 3] = value & 0xff
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# calculate padding
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def padding(off, ios):
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pad = (4 - off % 4) % 4 # padding to alignment of 4
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if ios <= 0x0F00 and pad != 0: # add 4 if IOS <= 15.0
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pad += 4
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return pad
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# update checksum
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def checksum(data, start, end):
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put_uint16(data, start + 4, 0) # set checksum to 0
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chk = 0
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idx = start
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while idx < end - 1:
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chk += get_uint16(data, idx)
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idx += 2
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if idx < end:
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chk += data[idx] << 8
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while chk >> 16:
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chk = (chk & 0xffff) + (chk >> 16)
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chk = chk ^ 0xffff
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put_uint16(data, start + 4, chk) # set checksum
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# import IOU NVRAM
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def nvram_import(nvram, startup, private, size):
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BASE_ADDRESS = 0x10000000
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DEFAULT_IOS = 0x0F04 # IOS 15.4
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# check size parameter
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if size is not None and (size < 8 or size > 1024):
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raise ValueError('invalid size')
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# create new nvram if nvram is empty or has wrong size
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if nvram is None or (size is not None and len(nvram) != size * 1024):
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nvram = bytearray([0] * (size * 1024))
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else:
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nvram = bytearray(nvram)
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# check nvram size
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nvram_len = len(nvram)
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if nvram_len < 8 * 1024 or nvram_len > 1024 * 1024 or nvram_len % 1024 != 0:
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raise ValueError('invalid NVRAM length')
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nvram_len = nvram_len // 2
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# get size of current config
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config_len = 0
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ios = None
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try:
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if get_uint16(nvram, 0) == 0xABCD:
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ios = get_uint16(nvram, 6)
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config_len = 36 + get_uint32(nvram, 16)
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config_len += padding(config_len, ios)
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if get_uint16(nvram, config_len) == 0xFEDC:
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config_len += 16 + get_uint32(nvram, config_len + 12)
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except IndexError:
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raise ValueError('unknown nvram format')
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if config_len > nvram_len:
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raise ValueError('unknown nvram format')
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# calculate max. config size
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max_config = nvram_len - 2 * 1024 # reserve 2k for files
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idx = max_config
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empty_sector = bytearray([0] * 1024)
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while True:
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idx -= 1024
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if idx < config_len:
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break
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# if valid file header:
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if get_uint16(nvram, idx + 0) == 0xDCBA and \
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get_uint16(nvram, idx + 4) < 8 and \
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get_uint16(nvram, idx + 6) <= 992:
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max_config = idx
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elif nvram[idx:idx + 1024] != empty_sector:
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break
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# import startup config
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startup = bytearray(startup)
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if ios is None:
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# Target IOS version is unknown. As some IOU don't work nicely with
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# the padding of a different version, the startup config is padded
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# with '\n' to the alignment of 4.
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ios = DEFAULT_IOS
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startup.extend([ord('\n')] * ((4 - len(startup) % 4) % 4))
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new_nvram = bytearray([0] * 36) # startup hdr
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put_uint16(new_nvram, 0, 0xABCD) # magic
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put_uint16(new_nvram, 2, 1) # raw data
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put_uint16(new_nvram, 6, ios) # IOS version
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put_uint32(new_nvram, 8, BASE_ADDRESS + 36) # start address
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put_uint32(new_nvram, 12, BASE_ADDRESS + 36 + len(startup)) # end address
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put_uint32(new_nvram, 16, len(startup)) # length
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new_nvram.extend(startup)
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new_nvram.extend([0] * padding(len(new_nvram), ios))
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# import private config
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if private is None:
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private = bytearray()
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else:
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private = bytearray(private)
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offset = len(new_nvram)
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new_nvram.extend([0] * 16) # private hdr
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put_uint16(new_nvram, 0 + offset, 0xFEDC) # magic
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put_uint16(new_nvram, 2 + offset, 1) # raw data
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put_uint32(new_nvram, 4 + offset,
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BASE_ADDRESS + offset + 16) # start address
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put_uint32(new_nvram, 8 + offset,
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BASE_ADDRESS + offset + 16 + len(private)) # end address
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put_uint32(new_nvram, 12 + offset, len(private)) # length
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new_nvram.extend(private)
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# add rest
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if len(new_nvram) > max_config:
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raise ValueError('NVRAM size too small')
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new_nvram.extend([0] * (max_config - len(new_nvram)))
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new_nvram.extend(nvram[max_config:])
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checksum(new_nvram, 0, nvram_len)
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return new_nvram
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if __name__ == '__main__':
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# Main program
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def check_size(string):
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try:
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value = int(string)
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except ValueError:
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raise argparse.ArgumentTypeError('invalid int value: ' + string)
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if value < 8 or value > 1024:
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raise argparse.ArgumentTypeError('size must be 8..1024')
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return value
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parser = argparse.ArgumentParser(description='%(prog)s imports startup/private configuration into IOU NVRAM file.')
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parser.add_argument('-c', '--create', metavar='size', type=check_size,
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help='create NVRAM file, size in kByte')
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parser.add_argument('nvram', metavar='NVRAM',
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help='NVRAM file')
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parser.add_argument('startup', metavar='startup-config',
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help='startup configuration')
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parser.add_argument('private', metavar='private-config', nargs='?',
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help='private configuration')
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args = parser.parse_args()
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try:
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if args.create is None:
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fd = open(args.nvram, 'rb')
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nvram = fd.read()
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fd.close()
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else:
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nvram = None
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fd = open(args.startup, 'rb')
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startup = fd.read()
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fd.close()
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if args.private is None:
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private = None
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else:
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fd = open(args.private, 'rb')
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private = fd.read()
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fd.close()
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except (IOError, OSError) as err:
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sys.stderr.write("Error reading file: {}\n".format(err))
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sys.exit(1)
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try:
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nvram = nvram_import(nvram, startup, private, args.create)
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except ValueError as err:
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sys.stderr.write("nvram_import: {}\n".format(err))
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sys.exit(3)
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try:
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fd = open(args.nvram, 'wb')
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fd.write(nvram)
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fd.close()
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except (IOError, OSError) as err:
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sys.stderr.write("Error writing file: {}\n".format(err))
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sys.exit(1)
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