forked from uncloud/uncloud
61 lines
1.6 KiB
Python
61 lines
1.6 KiB
Python
import subprocess as sp
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import random
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import logging
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import socket
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from contextlib import closing
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logger = logging.getLogger(__name__)
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def random_bytes(num=6):
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return [random.randrange(256) for _ in range(num)]
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def generate_mac(uaa=False, multicast=False, oui=None, separator=':', byte_fmt='%02x'):
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mac = random_bytes()
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if oui:
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if type(oui) == str:
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oui = [int(chunk) for chunk in oui.split(separator)]
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mac = oui + random_bytes(num=6 - len(oui))
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else:
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if multicast:
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mac[0] |= 1 # set bit 0
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else:
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mac[0] &= ~1 # clear bit 0
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if uaa:
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mac[0] &= ~(1 << 1) # clear bit 1
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else:
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mac[0] |= 1 << 1 # set bit 1
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return separator.join(byte_fmt % b for b in mac)
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def create_dev(script, _id, dev, ip=None):
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command = [script, _id, dev]
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if ip:
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command.append(ip)
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try:
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output = sp.check_output(command, stderr=sp.PIPE)
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except Exception as e:
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logger.exception('Creation of interface %s failed.', dev)
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print(e)
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return None
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else:
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return output.decode('utf-8').strip()
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def delete_network_interface(iface):
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try:
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sp.check_output(['ip', 'link', 'del', iface])
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except Exception:
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logger.exception('Interface Deletion failed')
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def find_free_port():
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with closing(socket.socket(socket.AF_INET, socket.SOCK_STREAM)) as s:
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try:
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s.bind(('', 0))
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s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
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except Exception:
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return None
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else:
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return s.getsockname()[1]
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