uncloud-mravi/uncloud/common/network.py

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import subprocess as sp
import random
import logging
import socket
from contextlib import closing
logger = logging.getLogger(__name__)
def random_bytes(num=6):
return [random.randrange(256) for _ in range(num)]
def generate_mac(
uaa=False, multicast=False, oui=None, separator=":", byte_fmt="%02x"
):
mac = random_bytes()
if oui:
if type(oui) == str:
oui = [int(chunk) for chunk in oui.split(separator)]
mac = oui + random_bytes(num=6 - len(oui))
else:
if multicast:
mac[0] |= 1 # set bit 0
else:
mac[0] &= ~1 # clear bit 0
if uaa:
mac[0] &= ~(1 << 1) # clear bit 1
else:
mac[0] |= 1 << 1 # set bit 1
return separator.join(byte_fmt % b for b in mac)
def create_dev(script, _id, dev, ip=None):
command = [
"sudo",
"-p",
"Enter password to create network devices for vm: ",
script,
str(_id),
dev,
]
if ip:
command.append(ip)
try:
output = sp.check_output(command, stderr=sp.PIPE)
except Exception:
logger.exception("Creation of interface %s failed.", dev)
return None
else:
return output.decode("utf-8").strip()
def delete_network_interface(iface):
try:
sp.check_output(
[
"sudo",
"-p",
"Enter password to remove {} network device: ".format(
iface
),
"ip",
"link",
"del",
iface,
],
stderr=sp.PIPE,
)
except Exception:
logger.exception("Interface %s Deletion failed", iface)