160 lines
4.0 KiB
Python
160 lines
4.0 KiB
Python
#!/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 = "02:00"
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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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@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}$', mac, re.I):
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raise Error("Not a valid mac address: %s" % mac)
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def free_append(self, mac):
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if mac in self.free:
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raise Error("Mac already in free database: %s" % mac)
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self._init_base_dir()
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self.free.append(mac)
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@staticmethod
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def get_base_dir():
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return cinv.get_base_dir("db/mac")
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@classmethod
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def exists(cls):
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return os.path.exists(cls.get_base_dir())
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def get_next(self):
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self._init_base_dir()
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if self.free:
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return self.free.pop()
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if not self.prefix:
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raise Error("Cannot generate address without prefix - use prefix-set")
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if self.last:
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suffix = re.search(r'([0-9A-F]{2}[-:]){2}[0-9A-F]{2}$', self.last, re.I)
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last_number_hex = "0x%s" % suffix.group().replace(":", "")
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last_number = int(last_number_hex, 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_hex = "%0.6x" % next_number
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next_suffix = "%s:%s:%s" % (next_number_hex[0:2], next_number_hex[2:4], next_number_hex[4:6])
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next_mac = "%s:%s" % (self.prefix, next_suffix)
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self.last = next_mac
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return next_mac
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@property
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def prefix(self):
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return self._prefix
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@prefix.setter
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def prefix(self, prefix):
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if not re.match(r'([0-9A-F]{2}[-:]){2}[0-9A-F]{2}$', prefix, re.I):
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raise Error("Wrong mac address format - use 00:11:22")
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self._init_base_dir()
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self._prefix = prefix
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@classmethod
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def commandline_generate(cls, args):
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mac = Mac()
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print(mac.get_next())
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@classmethod
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def commandline_free_add(cls, args):
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mac = Mac()
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mac.validate_mac(args.address)
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mac.free_append(args.address)
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@classmethod
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def commandline_free_list(cls, args):
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mac = Mac()
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for mac in mac.free:
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print(mac)
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@classmethod
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def commandline_prefix_set(cls, args):
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mac = Mac()
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mac.prefix = args.prefix
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@classmethod
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def commandline_prefix_get(cls, args):
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mac = cls()
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print(mac.prefix)
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@classmethod
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def commandline_add(cls, args):
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host = cls(fqdn=args.fqdn)
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host.host_type = args.type
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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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