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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 collections import OrderedDict
from cloudinit import log as logging
from cloudinit import subp, util
from . import renderer
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 sorted(self.conf_dict.items()):
if not v:
continue
contents += "[" + k + "]\n"
for e in sorted(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.resolve_conf_fn = config.get(
"resolve_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)
if dhcp in ["ipv6", "yes"] and isinstance(
iface.get("accept-ra", ""), bool
):
cfg.update_section(sec, "IPv6AcceptRA", iface["accept-ra"])
# 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
# Check to see if this interface matches against an interface
# from the network state that specified a set-name directive.
# If there is a device with a set-name directive and it has
# set-name value that matches the current name, then update the
# current name to the device's name. That will be the value in
# the ns.config['ethernets'] dict below.
for dev_name, dev_cfg in ns.config["ethernets"].items():
if "set-name" in dev_cfg:
if dev_cfg.get("set-name") == name:
name = dev_name
break
self.dhcp_domain(ns.config["ethernets"][name], cfg)
ret_dict.update({link: cfg.get_final_conf()})
return ret_dict
def available(target=None):
expected = ["ip", "systemctl"]
search = ["/usr/sbin", "/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)
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