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# vi: ts=4 expandtab
#
# Copyright (C) 2015 Canonical Ltd.
# Copyright (C) 2016 VMware INC.
#
# Author: Sankar Tanguturi <stanguturi@vmware.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3, as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import logging
import os
import subprocess
import re
logger = logging.getLogger(__name__)
class NicConfigurator:
def __init__(self, nics):
"""
Initialize the Nic Configurator
@param nics (list) an array of nics to configure
"""
self.nics = nics
self.mac2Name = {}
self.ipv4PrimaryGateway = None
self.ipv6PrimaryGateway = None
self.find_devices()
self._primaryNic = self.get_primary_nic()
def get_primary_nic(self):
"""
Retrieve the primary nic if it exists
@return (NicBase): the primary nic if exists, None otherwise
"""
primaryNic = None
for nic in self.nics:
if nic.primary:
if primaryNic:
raise Exception('There can only be one primary nic',
primaryNic.mac, nic.mac)
primaryNic = nic
return primaryNic
def find_devices(self):
"""
Create the mac2Name dictionary
The mac address(es) are in the lower case
"""
cmd = 'ip addr show'
outText = subprocess.check_output(cmd, shell=True).decode()
sections = re.split(r'\n\d+: ', '\n' + outText)[1:]
macPat = r'link/ether (([0-9A-Fa-f]{2}[:]){5}([0-9A-Fa-f]{2}))'
for section in sections:
matcher = re.search(macPat, section)
if not matcher: # Only keep info about nics
continue
mac = matcher.group(1).lower()
name = section.split(':', 1)[0]
self.mac2Name[mac] = name
def gen_one_nic(self, nic):
"""
Return the lines needed to configure a nic
@return (str list): the string list to configure the nic
@param nic (NicBase): the nic to configure
"""
lines = []
name = self.mac2Name.get(nic.mac.lower())
if not name:
raise ValueError('No known device has MACADDR: %s' % nic.mac)
if nic.onboot:
lines.append('auto %s' % name)
# Customize IPv4
lines.extend(self.gen_ipv4(name, nic))
# Customize IPv6
lines.extend(self.gen_ipv6(name, nic))
lines.append('')
return lines
def gen_ipv4(self, name, nic):
"""
Return the lines needed to configure the IPv4 setting of a nic
@return (str list): the string list to configure the gateways
@param name (str): name of the nic
@param nic (NicBase): the nic to configure
"""
lines = []
bootproto = nic.bootProto.lower()
if nic.ipv4_mode.lower() == 'disabled':
bootproto = 'manual'
lines.append('iface %s inet %s' % (name, bootproto))
if bootproto != 'static':
return lines
# Static Ipv4
v4 = nic.staticIpv4
if v4.ip:
lines.append(' address %s' % v4.ip)
if v4.netmask:
lines.append(' netmask %s' % v4.netmask)
# Add the primary gateway
if nic.primary and v4.gateways:
self.ipv4PrimaryGateway = v4.gateways[0]
lines.append(' gateway %s metric 0' % self.ipv4PrimaryGateway)
return lines
# Add routes if there is no primary nic
if not self._primaryNic:
lines.extend(self.gen_ipv4_route(nic, v4.gateways))
return lines
def gen_ipv4_route(self, nic, gateways):
"""
Return the lines needed to configure additional Ipv4 route
@return (str list): the string list to configure the gateways
@param nic (NicBase): the nic to configure
@param gateways (str list): the list of gateways
"""
lines = []
for gateway in gateways:
lines.append(' up route add default gw %s metric 10000' %
gateway)
return lines
def gen_ipv6(self, name, nic):
"""
Return the lines needed to configure the gateways for a nic
@return (str list): the string list to configure the gateways
@param name (str): name of the nic
@param nic (NicBase): the nic to configure
"""
lines = []
if not nic.staticIpv6:
return lines
# Static Ipv6
addrs = nic.staticIpv6
lines.append('iface %s inet6 static' % name)
lines.append(' address %s' % addrs[0].ip)
lines.append(' netmask %s' % addrs[0].netmask)
for addr in addrs[1:]:
lines.append(' up ifconfig %s inet6 add %s/%s' % (name, addr.ip,
addr.netmask))
# Add the primary gateway
if nic.primary:
for addr in addrs:
if addr.gateway:
self.ipv6PrimaryGateway = addr.gateway
lines.append(' gateway %s' % self.ipv6PrimaryGateway)
return lines
# Add routes if there is no primary nic
if not self._primaryNic:
lines.extend(self._genIpv6Route(name, nic, addrs))
return lines
def _genIpv6Route(self, name, nic, addrs):
lines = []
for addr in addrs:
lines.append(' up route -A inet6 add default gw %s metric 10000' %
addr.gateway)
return lines
def generate(self):
"""Return the lines that is needed to configure the nics"""
lines = []
lines.append('iface lo inet loopback')
lines.append('auto lo')
lines.append('')
for nic in self.nics:
lines.extend(self.gen_one_nic(nic))
return lines
def clear_dhcp(self):
logger.info('Clearing DHCP leases')
subprocess.call('pkill dhclient', shell=True)
subprocess.check_call('rm -f /var/lib/dhcp/*', shell=True)
def if_down_up(self):
names = []
for nic in self.nics:
name = self.mac2Name.get(nic.mac.lower())
names.append(name)
for name in names:
logger.info('Bring down interface %s' % name)
subprocess.check_call('ifdown %s' % name, shell=True)
self.clear_dhcp()
for name in names:
logger.info('Bring up interface %s' % name)
subprocess.check_call('ifup %s' % name, shell=True)
def configure(self):
"""
Configure the /etc/network/intefaces
Make a back up of the original
"""
containingDir = '/etc/network'
interfaceFile = os.path.join(containingDir, 'interfaces')
originalFile = os.path.join(containingDir,
'interfaces.before_vmware_customization')
if not os.path.exists(originalFile) and os.path.exists(interfaceFile):
os.rename(interfaceFile, originalFile)
lines = self.generate()
with open(interfaceFile, 'w') as fp:
for line in lines:
fp.write('%s\n' % line)
self.if_down_up()
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