mirror of
https://github.com/GNS3/gns3-server.git
synced 2024-11-17 17:24:51 +02:00
237 lines
6.8 KiB
Python
237 lines
6.8 KiB
Python
#!/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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# This utility is a stripped down version of dynamips' nvram_export,
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# ported from C to Python, see https://github.com/GNS3/dynamips
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# nvram_export is (c) 2013 Flávio J. Saraiva
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"""
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iou_export exports startup/private configuration from IOU NVRAM file.
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usage: iou_export [-h] 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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"""
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import argparse
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import sys
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# Uncompress data in .Z file format.
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# Ported from dynamips' fs_nvram.c to python
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# Adapted from 7zip's ZDecoder.cpp, which is licensed under LGPL 2.1.
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def uncompress_LZC(data):
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LZC_NUM_BITS_MIN = 9
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LZC_NUM_BITS_MAX = 16
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in_data = bytearray(data)
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in_len = len(in_data)
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out_data = bytearray()
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if in_len == 0:
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return out_data
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if in_len < 3:
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raise ValueError('invalid length')
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if in_data[0] != 0x1F or in_data[1] != 0x9D:
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raise ValueError('invalid header')
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maxbits = in_data[2] & 0x1F
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numItems = 1 << maxbits
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blockMode = (in_data[2] & 0x80) != 0
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if maxbits < LZC_NUM_BITS_MIN or maxbits > LZC_NUM_BITS_MAX:
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raise ValueError('not supported')
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parents = [0] * numItems
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suffixes = [0] * numItems
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in_pos = 3
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numBits = LZC_NUM_BITS_MIN
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head = 256
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if blockMode:
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head += 1
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needPrev = 0
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bitPos = 0
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numBufBits = 0
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parents[256] = 0
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suffixes[256] = 0
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buf_extend = bytearray([0] * 3)
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while True:
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# fill buffer, when empty
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if numBufBits == bitPos:
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buf_len = min(in_len - in_pos, numBits)
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buf = in_data[in_pos:in_pos + buf_len] + buf_extend
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numBufBits = buf_len << 3
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bitPos = 0
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in_pos += buf_len
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# extract next symbol
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bytePos = bitPos >> 3
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symbol = buf[bytePos] | buf[bytePos + 1] << 8 | buf[bytePos + 2] << 16
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symbol >>= bitPos & 7
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symbol &= (1 << numBits) - 1
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bitPos += numBits
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# check for special conditions: end, bad data, re-initialize dictionary
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if bitPos > numBufBits:
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break
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if symbol >= head:
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raise ValueError('invalid data')
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if blockMode and symbol == 256:
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numBufBits = bitPos = 0
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numBits = LZC_NUM_BITS_MIN
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head = 257
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needPrev = 0
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continue
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# convert symbol to string
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stack = []
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cur = symbol
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while cur >= 256:
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stack.append(suffixes[cur])
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cur = parents[cur]
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stack.append(cur)
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if needPrev:
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suffixes[head - 1] = cur
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if symbol == head - 1:
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stack[0] = cur
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stack.reverse()
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out_data.extend(stack)
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# update parents, check for numBits change
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if head < numItems:
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needPrev = 1
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parents[head] = symbol
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head += 1
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if head > (1 << numBits):
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if numBits < maxbits:
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numBufBits = bitPos = 0
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numBits += 1
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else:
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needPrev = 0
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return out_data
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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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# export IOU NVRAM
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def nvram_export(nvram):
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nvram = bytearray(nvram)
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# extract startup config
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offset = 0
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if len(nvram) < offset + 36:
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raise ValueError('invalid length')
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if get_uint16(nvram, offset + 0) != 0xABCD:
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raise ValueError('no startup config')
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format = get_uint16(nvram, offset + 2)
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length = get_uint32(nvram, offset + 16)
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offset += 36
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if len(nvram) < offset + length:
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raise ValueError('invalid length')
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startup = nvram[offset:offset + length]
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# compressed startup config
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if format == 2:
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try:
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startup = uncompress_LZC(startup)
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except ValueError as err:
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raise ValueError('uncompress startup: ' + str(err))
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offset += length
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# alignment to multiple of 4
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offset = (offset + 3) & ~3
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# check for additonal offset of 4
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if len(nvram) >= offset + 8 and \
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get_uint16(nvram, offset + 4) == 0xFEDC and \
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get_uint16(nvram, offset + 6) == 1:
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offset += 4
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# extract private config
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private = None
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if len(nvram) >= offset + 16 and get_uint16(nvram, offset + 0) == 0xFEDC:
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length = get_uint32(nvram, offset + 12)
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offset += 16
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if len(nvram) >= offset + length:
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private = nvram[offset:offset + length]
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return (startup, private)
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if __name__ == '__main__':
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# Main program
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parser = argparse.ArgumentParser(description='%(prog)s exports startup/private configuration from IOU NVRAM file.')
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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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fd = open(args.nvram, 'rb')
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nvram = 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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startup, private = nvram_export(nvram)
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except ValueError as err:
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sys.stderr.write("nvram_export: {}\n".format(err))
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sys.exit(3)
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try:
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fd = open(args.startup, 'wb')
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fd.write(startup)
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fd.close()
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if args.private is not None:
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if private is None:
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sys.stderr.write("Warning: No private config\n")
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else:
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fd = open(args.private, 'wb')
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fd.write(private)
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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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