lxc-network/lxc_net/util.py

""" Various utils """

from . import settings


class NumberedClass:
    """ A class that counts its current instance number """

    next_id = 0

    @classmethod
    def get_id(cls):
        out = cls.next_id
        cls.next_id += 1
        return out

    def __init__(self):
        self.id = self.get_id()


class MACAddress:
    """ A MAC address for a NIC or bridge """

    def __init__(self, link_id, dev_id):
        """ link_id: id of the current link
            dev_id: id of the current NIC. If the device is a bridge, use None
        """
        if not dev_id:
            dev_id = 0xFF

        self.link_id = link_id
        self.dev_id = dev_id

    def __str__(self):
        return "52:54:00:{nwid:02x}:{link_id:02x}:{dev_id:02x}".format(
            nwid=settings.NETWORK_ID, link_id=self.link_id, dev_id=self.dev_id
        )

    def __repr__(self):
        return str(self)


class Addrv4:
    """ An address in IPv4 """

    def __init__(self, link_id, dev_id):
        """ link_id: id of the current link
            dev_id: id of the current NIC. Use None to get the base address
        """
        if not dev_id:
            dev_id = 0

        self.link_id = link_id
        self.dev_id = dev_id
        self.netmask = "255.255.255.0"
        self.prefix = 24

    def __str__(self):
        return "{base_range}.{link_id}.{dev_id}".format(
            base_range=settings.IPV4_RANGE, link_id=self.link_id, dev_id=self.dev_id
        )

    def __repr__(self):
        return str(self)


class Addrv6:
    """ An address in IPv6 """

    def __init__(self, link_id, dev_id):
        """ link_id: id of the current link
            dev_id: id of the current NIC. Use None to get the base address
        """
        if not dev_id:
            dev_id = 0

        self.link_id = link_id
        self.dev_id = dev_id
        self.prefix = 64

    def __str__(self):
        return "{base_range}:{link_id:04x}::{dev_id:04x}".format(
            base_range=settings.IPV6_RANGE, link_id=self.link_id, dev_id=self.dev_id
        )