diff options
Diffstat (limited to 'cloudinit/net/networkd.py')
| -rw-r--r-- | cloudinit/net/networkd.py | 246 |
1 files changed, 246 insertions, 0 deletions
diff --git a/cloudinit/net/networkd.py b/cloudinit/net/networkd.py new file mode 100644 index 00000000..71f87995 --- /dev/null +++ b/cloudinit/net/networkd.py @@ -0,0 +1,246 @@ +#!/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)) + 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' + for k, v in conf.items(): + if k == 'gateway': + cfg.update_section(sec, 'Gateway', v) + elif k == 'network': + tmp = v + if 'prefix' in conf: + tmp += '/' + str(conf['prefix']) + cfg.update_section(sec, 'Destination', tmp) + elif k == 'metric': + cfg.update_section(sec, 'Metric', v) + + def parse_subnets(self, iface, cfg): + dhcp = 'no' + 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) + elif 'address' in e: + for k, v in e.items(): + if k == 'address': + tmp = v + if 'prefix' in e: + tmp += '/' + str(e['prefix']) + cfg.update_section('Address', 'Address', tmp) + elif k == 'gateway': + cfg.update_section('Route', 'Gateway', v) + elif k == 'dns_nameservers': + cfg.update_section('Network', 'DNS', ' '.join(v)) + elif k == 'dns_search': + cfg.update_section('Network', 'Domains', ' '.join(v)) + + cfg.update_section('Network', '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) |