import mac.py from cinv

This commit is contained in:
Nico Schottelius 2020-01-12 13:41:54 +01:00
parent b017df4879
commit 64ab011299

View file

@ -0,0 +1,171 @@
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# 2012 Nico Schottelius (nico-cinv at schottelius.org)
#
# This file is part of cinv.
#
# cinv 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 3 of the License, or
# (at your option) any later version.
#
# cinv 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 cinv. If not, see <http://www.gnu.org/licenses/>.
#
#
import argparse
import logging
import os.path
import os
import re
import cinv
from cinv import fsproperty
log = logging.getLogger(__name__)
class Error(cinv.Error):
pass
class Mac(object):
def __init__(self):
self.base_dir = self.get_base_dir()
_prefix = fsproperty.FileStringProperty(lambda obj: os.path.join(obj.base_dir, "prefix"))
free = fsproperty.FileListProperty(lambda obj: os.path.join(obj.base_dir, "free"))
last = fsproperty.FileStringProperty(lambda obj: os.path.join(obj.base_dir, "last"))
def _init_base_dir(self):
try:
os.makedirs(self.base_dir, exist_ok=True)
except OSError as e:
raise Error(e)
@staticmethod
def validate_mac(mac):
if not re.match(r'([0-9A-F]{2}[-:]){5}[0-9A-F]{2}$', mac, re.I):
raise Error("Not a valid mac address: %s" % mac)
def free_append(self, mac):
if mac in self.free:
raise Error("Mac already in free database: %s" % mac)
self._init_base_dir()
self.free.append(mac)
@staticmethod
def get_base_dir():
return cinv.get_base_dir("db/mac")
@classmethod
def exists(cls):
return os.path.exists(cls.get_base_dir())
def get_next(self):
self._init_base_dir()
if self.free:
return self.free.pop()
if not self.prefix:
raise Error("Cannot generate address without prefix - use prefix-set")
if self.last:
suffix = re.search(r'([0-9A-F]{2}[-:]){2}[0-9A-F]{2}$', self.last, re.I)
last_number_hex = "0x%s" % suffix.group().replace(":", "")
last_number = int(last_number_hex, 16)
if last_number == int('0xffffff', 16):
raise Error("Exhausted all possible mac addresses - try to free some")
next_number = last_number + 1
else:
next_number = 0
next_number_hex = "%0.6x" % next_number
next_suffix = "%s:%s:%s" % (next_number_hex[0:2], next_number_hex[2:4], next_number_hex[4:6])
next_mac = "%s:%s" % (self.prefix, next_suffix)
self.last = next_mac
return next_mac
@property
def prefix(self):
return self._prefix
@prefix.setter
def prefix(self, prefix):
if not re.match(r'([0-9A-F]{2}[-:]){2}[0-9A-F]{2}$', prefix, re.I):
raise Error("Wrong mac address format - use 00:11:22")
self._init_base_dir()
self._prefix = prefix
@classmethod
def commandline_generate(cls, args):
mac = Mac()
print(mac.get_next())
@classmethod
def commandline_free_add(cls, args):
mac = Mac()
mac.validate_mac(args.address)
mac.free_append(args.address)
@classmethod
def commandline_free_list(cls, args):
mac = Mac()
for mac in mac.free:
print(mac)
@classmethod
def commandline_prefix_set(cls, args):
mac = Mac()
mac.prefix = args.prefix
@classmethod
def commandline_prefix_get(cls, args):
mac = cls()
print(mac.prefix)
@classmethod
def commandline_add(cls, args):
host = cls(fqdn=args.fqdn)
host.host_type = args.type
@classmethod
def commandline_args(cls, parent_parser, parents):
"""Add us to the parent parser and add all parents to our parsers"""
parser = {}
parser['sub'] = parent_parser.add_subparsers(title="Mac Commands")
parser['free-add'] = parser['sub'].add_parser('free-add', parents=parents)
parser['free-add'].add_argument('address', help='Address to add to free database')
parser['free-add'].set_defaults(func=cls.commandline_free_add)
parser['free-list'] = parser['sub'].add_parser('free-list', parents=parents,
help="List free mac addresses")
parser['free-list'].set_defaults(func=cls.commandline_free_list)
parser['generate'] = parser['sub'].add_parser('generate', parents=parents)
parser['generate'].set_defaults(func=cls.commandline_generate)
parser['prefix-get'] = parser['sub'].add_parser('prefix-get', parents=parents)
parser['prefix-get'].set_defaults(func=cls.commandline_prefix_get)
parser['prefix-set'] = parser['sub'].add_parser('prefix-set', parents=parents)
parser['prefix-set'].add_argument('prefix', help="3 Byte address prefix (f.i. '00:16:3e')")
parser['prefix-set'].set_defaults(func=cls.commandline_prefix_set)