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|
#!/usr/bin/env python3
# vi: ts=4 expandtab
#
# Copyright (C) 2021 VMware Inc.
#
# Author: Shreenidhi Shedi <yesshedi@gmail.com>
#
# This file is part of cloud-init. See LICENSE file for license information.
import os
from . import renderer
from cloudinit import util
from cloudinit import subp
from cloudinit import log as logging
from collections import OrderedDict
LOG = logging.getLogger(__name__)
class CfgParser:
def __init__(self):
self.conf_dict = OrderedDict({
'Match': [],
'Link': [],
'Network': [],
'DHCPv4': [],
'DHCPv6': [],
'Address': [],
'Route': [],
})
def update_section(self, sec, key, val):
for k in self.conf_dict.keys():
if k == sec:
self.conf_dict[k].append(key+'='+str(val))
# remove duplicates from list
self.conf_dict[k] = list(dict.fromkeys(self.conf_dict[k]))
self.conf_dict[k].sort()
def get_final_conf(self):
contents = ''
for k, v in self.conf_dict.items():
if not v:
continue
contents += '['+k+']\n'
for e in v:
contents += e + '\n'
contents += '\n'
return contents
def dump_data(self, target_fn):
if not target_fn:
LOG.warning('Target file not given')
return
contents = self.get_final_conf()
LOG.debug('Final content: %s', contents)
util.write_file(target_fn, contents)
class Renderer(renderer.Renderer):
"""
Renders network information in /etc/systemd/network
This Renderer is currently experimental and doesn't support all the
use cases supported by the other renderers yet.
"""
def __init__(self, config=None):
if not config:
config = {}
self.resolved_conf = config.get('resolved_conf_fn',
'/etc/systemd/resolved.conf')
self.network_conf_dir = config.get('network_conf_dir',
'/etc/systemd/network/')
def generate_match_section(self, iface, cfg):
sec = 'Match'
match_dict = {
'name': 'Name',
'driver': 'Driver',
'mac_address': 'MACAddress'
}
if not iface:
return
for k, v in match_dict.items():
if k in iface and iface[k]:
cfg.update_section(sec, v, iface[k])
return iface['name']
def generate_link_section(self, iface, cfg):
sec = 'Link'
if not iface:
return
if 'mtu' in iface and iface['mtu']:
cfg.update_section(sec, 'MTUBytes', iface['mtu'])
def parse_routes(self, conf, cfg):
sec = 'Route'
route_cfg_map = {
'gateway': 'Gateway',
'network': 'Destination',
'metric': 'Metric',
}
# prefix is derived using netmask by network_state
prefix = ''
if 'prefix' in conf:
prefix = '/' + str(conf['prefix'])
for k, v in conf.items():
if k not in route_cfg_map:
continue
if k == 'network':
v += prefix
cfg.update_section(sec, route_cfg_map[k], v)
def parse_subnets(self, iface, cfg):
dhcp = 'no'
sec = 'Network'
for e in iface.get('subnets', []):
t = e['type']
if t == 'dhcp4' or t == 'dhcp':
if dhcp == 'no':
dhcp = 'ipv4'
elif dhcp == 'ipv6':
dhcp = 'yes'
elif t == 'dhcp6':
if dhcp == 'no':
dhcp = 'ipv6'
elif dhcp == 'ipv4':
dhcp = 'yes'
if 'routes' in e and e['routes']:
for i in e['routes']:
self.parse_routes(i, cfg)
if 'address' in e:
subnet_cfg_map = {
'address': 'Address',
'gateway': 'Gateway',
'dns_nameservers': 'DNS',
'dns_search': 'Domains',
}
for k, v in e.items():
if k == 'address':
if 'prefix' in e:
v += '/' + str(e['prefix'])
cfg.update_section('Address', subnet_cfg_map[k], v)
elif k == 'gateway':
cfg.update_section('Route', subnet_cfg_map[k], v)
elif k == 'dns_nameservers' or k == 'dns_search':
cfg.update_section(sec, subnet_cfg_map[k], ' '.join(v))
cfg.update_section(sec, 'DHCP', dhcp)
# This is to accommodate extra keys present in VMware config
def dhcp_domain(self, d, cfg):
for item in ['dhcp4domain', 'dhcp6domain']:
if item not in d:
continue
ret = str(d[item]).casefold()
try:
ret = util.translate_bool(ret)
ret = 'yes' if ret else 'no'
except ValueError:
if ret != 'route':
LOG.warning('Invalid dhcp4domain value - %s', ret)
ret = 'no'
if item == 'dhcp4domain':
section = 'DHCPv4'
else:
section = 'DHCPv6'
cfg.update_section(section, 'UseDomains', ret)
def parse_dns(self, iface, cfg, ns):
sec = 'Network'
dns_cfg_map = {
'search': 'Domains',
'nameservers': 'DNS',
'addresses': 'DNS',
}
dns = iface.get('dns')
if not dns and ns.version == 1:
dns = {
'search': ns.dns_searchdomains,
'nameservers': ns.dns_nameservers,
}
elif not dns and ns.version == 2:
return
for k, v in dns_cfg_map.items():
if k in dns and dns[k]:
cfg.update_section(sec, v, ' '.join(dns[k]))
def create_network_file(self, link, conf, nwk_dir):
net_fn_owner = 'systemd-network'
LOG.debug('Setting Networking Config for %s', link)
net_fn = nwk_dir + '10-cloud-init-' + link + '.network'
util.write_file(net_fn, conf)
util.chownbyname(net_fn, net_fn_owner, net_fn_owner)
def render_network_state(self, network_state, templates=None, target=None):
fp_nwkd = self.network_conf_dir
if target:
fp_nwkd = subp.target_path(target) + fp_nwkd
util.ensure_dir(os.path.dirname(fp_nwkd))
ret_dict = self._render_content(network_state)
for k, v in ret_dict.items():
self.create_network_file(k, v, fp_nwkd)
def _render_content(self, ns):
ret_dict = {}
for iface in ns.iter_interfaces():
cfg = CfgParser()
link = self.generate_match_section(iface, cfg)
self.generate_link_section(iface, cfg)
self.parse_subnets(iface, cfg)
self.parse_dns(iface, cfg, ns)
for route in ns.iter_routes():
self.parse_routes(route, cfg)
if ns.version == 2:
name = iface['name']
# network state doesn't give dhcp domain info
# using ns.config as a workaround here
self.dhcp_domain(ns.config['ethernets'][name], cfg)
ret_dict.update({link: cfg.get_final_conf()})
return ret_dict
def available(target=None):
expected = ['systemctl']
search = ['/usr/bin', '/bin']
for p in expected:
if not subp.which(p, search=search, target=target):
return False
return True
def network_state_to_networkd(ns):
renderer = Renderer({})
return renderer._render_content(ns)
|
