102 lines
3.7 KiB
Python
102 lines
3.7 KiB
Python
#!/usr/bin/env python
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# Copyright 2017 Citrix Systems
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""HIMN utils
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It contains the utiles relative to HIMN(Host Internal Management Network."""
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import ipaddress
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import netifaces
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import sys
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from os_xenapi.client import exception
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from os_xenapi.utils import common_function
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def get_local_himn_eth_via_xenstore():
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# Find HIMN eth by querying xenstore.
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domid = common_function.execute('xenstore-read', 'domid')
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himn_mac = common_function.execute(
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'xenstore-read',
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'/local/domain/%s/vm-data/himn_mac' % domid)
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eths = [eth for eth in netifaces.interfaces()
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if common_function.get_eth_mac(eth) == himn_mac]
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if len(eths) != 1:
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raise exception.GetInterfaceOnHIMNMacError(himn_mac)
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return eths[0]
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def get_local_himn_eth_via_ip(ip_in_himn, eths=None):
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# Get the local interface which is connected to HIMN by searching
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# an eth whose IP address is in the same network as `ip_in_himn`.
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# By default search all available interfaces. The parameter of
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# `eths` can be used to specify a list of interfaces, so that
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# it will only search interfaces belong to the list.
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if eths is None:
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eths = netifaces.interfaces()
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for eth in eths:
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ipv4s = netifaces.ifaddresses(eth).get(netifaces.AF_INET, [])
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for ipv4 in ipv4s:
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net_if = ipaddress.IPv4Interface(
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ipv4['addr'] + '/' + ipv4['netmask'])
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if isinstance(ip_in_himn, bytes):
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ip_in_himn = ip_in_himn.decode('utf-8')
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hint_himn_ipaddr = ipaddress.ip_address(ip_in_himn)
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if hint_himn_ipaddr in net_if.network:
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# Got the interface which has an IP address belong to HIMN.
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return eth
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return None
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def get_local_himn_eth(himn_dom0_ip):
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eth = get_local_himn_eth_via_ip(himn_dom0_ip)
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if eth:
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return eth
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# the local HIMN interfae has not got IP address: e.g. the interface
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# is not up or has not requested DHCP address; then try to get eth
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# via xenstore.
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return get_local_himn_eth_via_xenstore()
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def persist_eth_cfg(eth, bootproto='dhcp', defroute='no', onboot='yes'):
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# Persist eth configure into ifcfg-eth file.
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ifcfg_file = '/etc/sysconfig/network-scripts/ifcfg-%s' % eth
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with open(ifcfg_file, 'w') as ifcfg:
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ifcfg.write('DEVICE="%s"\n' % eth)
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ifcfg.write('IPV6INIT="no"\n')
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ifcfg.write('BOOTPROTO="%s"\n' % bootproto)
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ifcfg.write('DEFROUTE="%s"\n' % defroute)
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ifcfg.write('ONBOOT="%s"\n' % onboot)
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def config_himn(himn_dom0_ip):
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eth = get_local_himn_eth(himn_dom0_ip)
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# populate the ifcfg file for HIMN interface, so that it will always get ip
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# in the future.
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if not eth:
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raise exception.NoNetworkInterfaceInSameSegment(himn_dom0_ip)
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persist_eth_cfg(eth)
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# Force a restart on this interface by using the configure file.
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# It will ensure the interface up and refresh IP via DHCP.
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# NOTE(jianghuaw): use ifconfig to activate interface firstly.
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common_function.execute('ifconfig', eth, 'up')
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common_function.execute('ifdown', eth)
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common_function.execute('ifup', eth)
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if __name__ == '__main__':
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config_himn(sys.argv[1])
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