118 lines
3.1 KiB
Python
Executable File
118 lines
3.1 KiB
Python
Executable File
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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#
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# 2012 Nico Schottelius (nico-cinv at schottelius.org)
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#
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# This file is part of cinv.
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#
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# cinv 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 3 of the License, or
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# (at your option) any later version.
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#
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# cinv 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 cinv. If not, see <http://www.gnu.org/licenses/>.
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#
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#
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import argparse
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import logging
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import os.path
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import os
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import re
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log = logging.getLogger(__name__)
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class Error(Exception):
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pass
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class Mac(object):
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def __init__(self):
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self.base_dir = "."
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self.prefix = 0x002000000000
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#self.prefix = "{:012x}".format(self._prefix)
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self.free = self.read_file("mac-free")
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self.last = self.read_file("mac-last")
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def read_file(self, filename):
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fname = os.path.join(self.base_dir, filename)
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ret = []
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try:
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with open(fname, "r") as fd:
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ret = fd.readlines()
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except Exception as e:
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pass
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return ret
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def append_to_file(self, text, filename):
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fname = os.path.join(self.base_dir, filename)
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with open(fname, "a+") as fd:
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fd.write("{}\n".format(text))
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@staticmethod
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def validate_mac(mac):
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if not re.match(r'([0-9A-F]{2}[-:]){5}[0-9A-F]{2}$', mac, re.I):
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raise Error("Not a valid mac address: %s" % mac)
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def free_append(self, mac):
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if mac in self.free:
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raise Error("Mac already in free database: %s" % mac)
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self.append_to_file(mac, "mac-free")
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self.free = self.read_file("mac-free")
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@staticmethod
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def int_to_mac(number):
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b = number.to_bytes(6, byteorder="big")
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return ':'.join(format(s, '02x') for s in b)
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def getnext(self):
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# if self.free:
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# return self.free.pop()
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# if not self.prefix:
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# raise Error("Cannot generate address without prefix - use prefix-set")
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if self.last:
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last_number = int(self.last[0], 16)
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if last_number == int('0xffffff', 16):
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raise Error("Exhausted all possible mac addresses - try to free some")
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next_number = last_number + 1
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else:
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next_number = 0
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next_number_string = "{:012x}".format(next_number)
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next_mac_number = self.prefix + next_number
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next_mac = self.int_to_mac(next_mac_number)
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with open(os.path.join(self.base_dir, "mac-last"), "w+") as fd:
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fd.write("{}\n".format(next_number_string))
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return next_mac
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@classmethod
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def commandline(cls):
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pass
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if __name__ == '__main__':
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m = Mac()
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m.commandline()
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# print(m.free)
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#print(m.last)
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print(m.getnext())
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