uncloud/ucloud/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 = [script, str(_id), dev]
if ip:
command.append(ip)
try:
output = sp.check_output(command, stderr=sp.PIPE)
except Exception as e:
logger.exception('Creation of interface %s failed.', dev)
print(e)
return None
else:
return output.decode('utf-8').strip()
def delete_network_interface(iface):
try:
sp.check_output(['ip', 'link', 'del', iface])
except Exception:
logger.exception('Interface Deletion failed')
def find_free_port():
with closing(socket.socket(socket.AF_INET, socket.SOCK_STREAM)) as s:
try:
s.bind(('', 0))
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
except Exception:
return None
else:
return s.getsockname()[1]