Add helper files

This commit is contained in:
Théophile Bastian 2020-03-09 12:14:26 +01:00
parent 8a1ee721f3
commit 90baaa8d03
4 changed files with 119 additions and 0 deletions

0
src/__init__.py Normal file
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src/settings.py Normal file
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""" General settings """
# Prefix to all the networks and containers created
PREFIX = "testnw"
# Container base installation path -- will be overlaid
CONTAINER_BASE_ROOT = "/var/lib/machines/lxc-base-" + PREFIX
# Overlayfs mount dir
OVERLAYFS_MOUNT_DIR = "/tmp/{}-overlays/".format(PREFIX)
# The ID of the whole generated network -- below 0xff
NETWORK_ID = 132
# IPv4 /16 range
IPV4_RANGE = "10.{}".format(NETWORK_ID)
# IPv6 /32 range
IPV6_RANGE = "fd80:ba{:02x}".format(NETWORK_ID)

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src/util.py Normal file
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""" Various utils """
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
)

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src/xml_template.py Normal file
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""" Reads an XML template from a file """
import os
class XMLTemplate:
""" Reads and instanciates a template from a file """
def __init__(self, path):
self.path = os.path.join(os.path.dirname(os.path.abspath(__file__)), path)
with open(self.path, "r") as handle:
self.template_str = handle.read()
def inst(self, *args, **kwargs):
""" instanciates the template """
return self.template_str.format(*args, **kwargs)