forked from uncloud/uncloud
90 lines
2.6 KiB
Python
Executable file
90 lines
2.6 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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import json
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from uncloud import UncloudException
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from uncloud.hack.db import DB
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log = logging.getLogger(__name__)
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class MAC(object):
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def __init__(self, config):
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self.config = config
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self.db = DB(config, prefix="/mac")
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self.prefix = 0x002000000000
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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 last_used_index(self):
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value = self.db.get("last_used_index")
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if not value:
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self.db.set("last_used_index", "0")
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value = self.db.get("last_used_index")
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return int(value)
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def last_used_mac(self):
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return self.int_to_mac(self.prefix + self.last_used_index())
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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 get_next(self, vmuuid=None, as_int=False):
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last_number = self.last_used_index()
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# FIXME: compare to 48bit minus prefix length to the power of 2
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if last_number == int('0xffffff', 16):
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raise UncloudException("Exhausted all possible mac addresses - try to free some")
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next_number = last_number + 1
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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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db_entry = {}
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db_entry['vm_uuid'] = vmuuid
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db_entry['index'] = next_number
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db_entry['mac_address'] = next_mac
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# should be one transaction
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self.db.increment("last_used_index")
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self.db.set("used/{}".format(next_mac),
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db_entry, as_json=True)
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if as_int:
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return next_mac_number
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else:
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return next_mac
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