104 lines
3.2 KiB
Python
Executable file
104 lines
3.2 KiB
Python
Executable file
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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#
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# MIDTOOLS.PY -- Gestion de la conversion mid <-> IP
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#
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# Copyright (C) 2010 Olivier Iffrig
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# Authors: Olivier Iffrig <iffrig@crans.org>
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#
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# This program 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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# 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, see <http://www.gnu.org/licenses/>.
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import config
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import iptools
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class Mid(object):
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"""
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Permet de décortiquer un mid et d'obtenir les IP correspondantes
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"""
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def __init__(self, mid=None):
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if mid is not None:
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self.parse(mid)
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else:
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self.mid = None
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self.reste = False
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self.type = None
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self.ipv4_dispo = False
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self.priv = False
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def parse(self, mid):
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self.mid = mid
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self.type = None
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for tp in config.mid:
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if mid <= tp[1] and mid >= tp[0]:
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self.type = tp
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if self.type is None:
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raise ValueError("mid inconnu : %d" % mid)
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self.ipv4_dispo = False
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if (mid & (1 << 15)) == 0 and self.type != 'special':
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self.ipv4_dispo = True
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self.priv = True
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if (mid & (1 << 14)) == 0:
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self.priv = False
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self.reste = mid & 0x7ff
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# if self.type == 'ens': # Inutile pour l'instant
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# self.reste &= 0xff
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def from_ipv4(self, ip):
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"""
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Met à jour l' instance pour correspondre à l'IPv4 donnée
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"""
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self.ipv4_dispo = True
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self.priv = ip.startswith('10.')
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for tp in ['fil', 'wifi', 'adm', 'gratuit', 'ens']:
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if iptools.AddrInNet(ip, config.NETs[tp]):
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self.type = tp
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break
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if self.type is None:
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raise ValueError("Impossible de convertir l'adresse IP")
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self.mid = int(iptools.QuadToDec(ip))
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self.mid -= int(iptools.param(config.NETs[self.type][0],
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True)['network'])
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self.reste = self.mid & 0x7ff
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return self.mid
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# if self.type == 'ens': # Inutile pour l'instant
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# self.reste &= 0xff
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def to_ipv4(self):
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"""
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Génère l'IPv4 associée à la machine
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"""
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if not self.ipv4_dispo:
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raise ValueError("Pas d'adresse ipv4 disponible pour la machine")
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ip = iptools.param(config.NETs[self.type][0], True)['network']
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ip += self.reste
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return iptools.DecToQuad(ip)
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def to_ipv6_vlan(self):
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"""
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Génère le préfix IPv6 associé à la machine
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"""
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if self.priv:
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raise ValueError("Pas de prefix ipv6 disponible pour cette machine")
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ip = config.prefix['subnet'][0].split(":/")[0]
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ip += hex(self.mid)[2:]
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ip += "::/64"
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return ip
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