mirror of
https://github.com/GNS3/gns3-server.git
synced 2024-12-20 13:23:10 +00:00
237 lines
6.8 KiB
Python
237 lines
6.8 KiB
Python
#!/usr/bin/env python3
|
|
# -*- coding: utf-8 -*-
|
|
|
|
# To use python v2.7 change the first line to:
|
|
#!/usr/bin/env python
|
|
|
|
# Copyright (C) 2015 Bernhard Ehlers
|
|
#
|
|
# This program is free software: you can redistribute it and/or modify
|
|
# it under the terms of the GNU General Public License as published by
|
|
# the Free Software Foundation, either version 2 of the License, or
|
|
# (at your option) any later version.
|
|
#
|
|
# This program is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU General Public License
|
|
# along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
# This utility is a stripped down version of dynamips' nvram_export,
|
|
# ported from C to Python, see https://github.com/GNS3/dynamips
|
|
# nvram_export is (c) 2013 Flávio J. Saraiva
|
|
|
|
"""
|
|
iou_export exports startup/private configuration from IOU NVRAM file.
|
|
|
|
usage: iou_export [-h] NVRAM startup-config [private-config]
|
|
|
|
positional arguments:
|
|
NVRAM NVRAM file
|
|
startup-config startup configuration
|
|
private-config private configuration
|
|
|
|
optional arguments:
|
|
-h, --help show this help message and exit
|
|
"""
|
|
|
|
import argparse
|
|
import sys
|
|
|
|
|
|
# Uncompress data in .Z file format.
|
|
# Ported from dynamips' fs_nvram.c to python
|
|
# Adapted from 7zip's ZDecoder.cpp, which is licensed under LGPL 2.1.
|
|
def uncompress_LZC(data):
|
|
LZC_NUM_BITS_MIN = 9
|
|
LZC_NUM_BITS_MAX = 16
|
|
|
|
in_data = bytearray(data)
|
|
in_len = len(in_data)
|
|
out_data = bytearray()
|
|
|
|
if in_len == 0:
|
|
return out_data
|
|
if in_len < 3:
|
|
raise ValueError('invalid length')
|
|
if in_data[0] != 0x1F or in_data[1] != 0x9D:
|
|
raise ValueError('invalid header')
|
|
|
|
maxbits = in_data[2] & 0x1F
|
|
numItems = 1 << maxbits
|
|
blockMode = (in_data[2] & 0x80) != 0
|
|
if maxbits < LZC_NUM_BITS_MIN or maxbits > LZC_NUM_BITS_MAX:
|
|
raise ValueError('not supported')
|
|
|
|
parents = [0] * numItems
|
|
suffixes = [0] * numItems
|
|
|
|
in_pos = 3
|
|
numBits = LZC_NUM_BITS_MIN
|
|
head = 256
|
|
if blockMode:
|
|
head += 1
|
|
|
|
needPrev = 0
|
|
bitPos = 0
|
|
numBufBits = 0
|
|
|
|
parents[256] = 0
|
|
suffixes[256] = 0
|
|
|
|
buf_extend = bytearray([0] * 3)
|
|
|
|
while True:
|
|
# fill buffer, when empty
|
|
if numBufBits == bitPos:
|
|
buf_len = min(in_len - in_pos, numBits)
|
|
buf = in_data[in_pos:in_pos + buf_len] + buf_extend
|
|
numBufBits = buf_len << 3
|
|
bitPos = 0
|
|
in_pos += buf_len
|
|
|
|
# extract next symbol
|
|
bytePos = bitPos >> 3
|
|
symbol = buf[bytePos] | buf[bytePos + 1] << 8 | buf[bytePos + 2] << 16
|
|
symbol >>= bitPos & 7
|
|
symbol &= (1 << numBits) - 1
|
|
bitPos += numBits
|
|
|
|
# check for special conditions: end, bad data, re-initialize dictionary
|
|
if bitPos > numBufBits:
|
|
break
|
|
if symbol >= head:
|
|
raise ValueError('invalid data')
|
|
if blockMode and symbol == 256:
|
|
numBufBits = bitPos = 0
|
|
numBits = LZC_NUM_BITS_MIN
|
|
head = 257
|
|
needPrev = 0
|
|
continue
|
|
|
|
# convert symbol to string
|
|
stack = []
|
|
cur = symbol
|
|
while cur >= 256:
|
|
stack.append(suffixes[cur])
|
|
cur = parents[cur]
|
|
stack.append(cur)
|
|
if needPrev:
|
|
suffixes[head - 1] = cur
|
|
if symbol == head - 1:
|
|
stack[0] = cur
|
|
stack.reverse()
|
|
out_data.extend(stack)
|
|
|
|
# update parents, check for numBits change
|
|
if head < numItems:
|
|
needPrev = 1
|
|
parents[head] = symbol
|
|
head += 1
|
|
if head > (1 << numBits):
|
|
if numBits < maxbits:
|
|
numBufBits = bitPos = 0
|
|
numBits += 1
|
|
else:
|
|
needPrev = 0
|
|
|
|
return out_data
|
|
|
|
|
|
# extract 16 bit unsigned int from data
|
|
def get_uint16(data, off):
|
|
return data[off] << 8 | data[off + 1]
|
|
|
|
|
|
# extract 32 bit unsigned int from data
|
|
def get_uint32(data, off):
|
|
return data[off] << 24 | data[off + 1] << 16 | data[off + 2] << 8 | data[off + 3]
|
|
|
|
|
|
# export IOU NVRAM
|
|
def nvram_export(nvram):
|
|
nvram = bytearray(nvram)
|
|
|
|
# extract startup config
|
|
offset = 0
|
|
if len(nvram) < offset + 36:
|
|
raise ValueError('invalid length')
|
|
if get_uint16(nvram, offset + 0) != 0xABCD:
|
|
raise ValueError('no startup config')
|
|
format = get_uint16(nvram, offset + 2)
|
|
length = get_uint32(nvram, offset + 16)
|
|
offset += 36
|
|
if len(nvram) < offset + length:
|
|
raise ValueError('invalid length')
|
|
startup = nvram[offset:offset + length]
|
|
|
|
# compressed startup config
|
|
if format == 2:
|
|
try:
|
|
startup = uncompress_LZC(startup)
|
|
except ValueError as err:
|
|
raise ValueError('uncompress startup: ' + str(err))
|
|
|
|
offset += length
|
|
# alignment to multiple of 4
|
|
offset = (offset + 3) & ~3
|
|
# check for additonal offset of 4
|
|
if len(nvram) >= offset + 8 and \
|
|
get_uint16(nvram, offset + 4) == 0xFEDC and \
|
|
get_uint16(nvram, offset + 6) == 1:
|
|
offset += 4
|
|
|
|
# extract private config
|
|
private = None
|
|
if len(nvram) >= offset + 16 and get_uint16(nvram, offset + 0) == 0xFEDC:
|
|
length = get_uint32(nvram, offset + 12)
|
|
offset += 16
|
|
if len(nvram) >= offset + length:
|
|
private = nvram[offset:offset + length]
|
|
|
|
return (startup, private)
|
|
|
|
|
|
if __name__ == '__main__':
|
|
# Main program
|
|
|
|
parser = argparse.ArgumentParser(description='%(prog)s exports startup/private configuration from IOU NVRAM file.')
|
|
parser.add_argument('nvram', metavar='NVRAM',
|
|
help='NVRAM file')
|
|
parser.add_argument('startup', metavar='startup-config',
|
|
help='startup configuration')
|
|
parser.add_argument('private', metavar='private-config', nargs='?',
|
|
help='private configuration')
|
|
args = parser.parse_args()
|
|
|
|
try:
|
|
fd = open(args.nvram, 'rb')
|
|
nvram = fd.read()
|
|
fd.close()
|
|
except (IOError, OSError) as err:
|
|
sys.stderr.write("Error reading file: {}\n".format(err))
|
|
sys.exit(1)
|
|
|
|
try:
|
|
startup, private = nvram_export(nvram)
|
|
except ValueError as err:
|
|
sys.stderr.write("nvram_export: {}\n".format(err))
|
|
sys.exit(3)
|
|
|
|
try:
|
|
fd = open(args.startup, 'wb')
|
|
fd.write(startup)
|
|
fd.close()
|
|
if args.private is not None:
|
|
if private is None:
|
|
sys.stderr.write("Warning: No private config\n")
|
|
else:
|
|
fd = open(args.private, 'wb')
|
|
fd.write(private)
|
|
fd.close()
|
|
except (IOError, OSError) as err:
|
|
sys.stderr.write("Error writing file: {}\n".format(err))
|
|
sys.exit(1)
|