mirror of
https://github.com/tripleoxygen/router_hacking.git
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121 lines
3.0 KiB
Python
Executable File
121 lines
3.0 KiB
Python
Executable File
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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#
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# v5471cfg - Pace V5471 configuration diff file encoder and decoder
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#
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# The router.bin file is actually a 'tar' file scrambled by a quite
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# simple algo based on bitwise operations.
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#
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# Inside the tar, there are 2 important files:
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#
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# * router.diff - A diff against the modem default configuration.
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# Lines starting with '-' means UNSET that parameter,
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# while "+" lines SETS it.
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#
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# * router.magic - Simple verification/check for the router.diff file.
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# It contains the file size of router.diff in ASCII.
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#
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# Copyright (C) 2014 Triple Oxygen <oxy@g3n.org>
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (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, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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import sys
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MAGIC_UNSCRAMBLE = 0x765432
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MAGIC_SCRAMBLE = 0x7fffff
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HEADER = bytearray([0xff, 0xff, 0xaa, 0xaa, 0xaa])
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def decode(buf):
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reg = MAGIC_UNSCRAMBLE
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for i in range(len(buf)):
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xor = ((reg >> 5) ^ reg) & 0xff
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reg >>= 8
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reg += ((buf[i] & 0xff) << 15)
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buf[i] ^= xor
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def encode(buf):
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reg = MAGIC_SCRAMBLE
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for i in range(len(buf)):
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xor = ((reg >> 5) ^ reg) & 0xff
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buf[i] ^= xor
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reg >>= 8
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reg += ((buf[i] & 0xff) << 15)
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def usage():
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print("Usage:")
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print()
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print("v5471cfg.py [mode] [input] [output]\n")
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print("mode\t-e\tEncode file")
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print("\t-d\tDecode file")
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print("input\t\tInput file name")
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print("output\t\tOutput file name")
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print()
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print("Example:")
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print("\tTo decode the file 'router.bin' to 'router.tar':")
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print("\tv5471cfg.py -d router.bin router.tar")
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print()
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print("\tTo encode the file 'router.tar' to 'router.new.bin':")
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print("\tv5471cfg.py -e router.tar router.new.bin")
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print()
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def main(args):
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print()
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print("Pace V5471 Configuration diff file Encoder / Decoder")
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print("Copyright (C) 2014 Triple Oxygen <oxy@g3n.org>")
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print()
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if len(args) != 4:
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usage()
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sys.exit(-1)
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mode = args[1]
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if (mode == '-d' or mode == '-e'):
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try:
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i = open(args[2], 'rb')
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buf = bytearray(i.read())
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i.close()
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if (mode == '-e'):
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print("[+] Encoding data.")
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buf = HEADER[2:] + buf
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encode(buf)
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buf = HEADER[:2] + buf
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else:
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print("[+] Decoding data.")
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decode(buf)
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buf = buf[5:]
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o = open(args[3], 'wb')
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o.write(buf)
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o.close()
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except IOError as e:
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print("[!] Error: {0}.".format(e.strerror))
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else:
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print("[+] Done!")
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else:
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print("[-] Unknown mode.")
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print()
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if __name__ == '__main__':
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main(sys.argv)
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