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#!/usr/bin/env python3 # vi: ts=4 expandtab # # Copyright (C) 2021-2022 VMware Inc. # # Author: Shreenidhi Shedi <yesshedi@gmail.com> # # This file is part of cloud-init. See LICENSE file for license information. from collections import OrderedDict from typing import Optional from cloudinit import log as logging from cloudinit import subp, util from cloudinit.net import renderer from cloudinit.net.network_state import NetworkState 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 update_route_section(self, sec, rid, key, val): """ For each route section we use rid as a key, this allows us to isolate this route from others on subsequent calls. """ for k in self.conf_dict.keys(): if k == sec: if rid not in self.conf_dict[k]: self.conf_dict[k][rid] = [] self.conf_dict[k][rid].append(key + "=" + str(val)) # remove duplicates from list self.conf_dict[k][rid] = list( dict.fromkeys(self.conf_dict[k][rid]) ) self.conf_dict[k][rid].sort() def get_final_conf(self): contents = "" for k, v in sorted(self.conf_dict.items()): if not v: continue if k == "Address": for e in sorted(v): contents += "[" + k + "]\n" contents += e + "\n" contents += "\n" elif k == "Route": for n in sorted(v): contents += "[" + k + "]\n" for e in sorted(v[n]): contents += e + "\n" contents += "\n" else: 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: CfgParser): 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: CfgParser): sec = "Link" if not iface: return if "mtu" in iface and iface["mtu"]: cfg.update_section(sec, "MTUBytes", iface["mtu"]) def parse_routes(self, rid, conf, cfg: CfgParser): """ Parse a route and use rid as a key in order to isolate the route from others in the route dict. """ 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_route_section(sec, rid, route_cfg_map[k], v) def parse_subnets(self, iface, cfg: CfgParser): dhcp = "no" sec = "Network" rid = 0 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"]: # Use "r" as a dict key prefix for this route to isolate # it from other sources of routes self.parse_routes(f"r{rid}", i, cfg) rid = rid + 1 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": # Use "a" as a dict key prefix for this route to # isolate it from other sources of routes cfg.update_route_section( "Route", f"a{rid}", subnet_cfg_map[k], v ) rid = rid + 1 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"]) return dhcp # This is to accommodate extra keys present in VMware config def dhcp_domain(self, d, cfg: CfgParser): 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: CfgParser, ns: NetworkState): 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 parse_dhcp_overrides(self, cfg: CfgParser, device, dhcp, version): dhcp_config_maps = { "UseDNS": "use-dns", "UseDomains": "use-domains", "UseHostname": "use-hostname", "UseNTP": "use-ntp", } if version == "4": dhcp_config_maps.update( { "SendHostname": "send-hostname", "Hostname": "hostname", "RouteMetric": "route-metric", "UseMTU": "use-mtu", "UseRoutes": "use-routes", } ) if f"dhcp{version}-overrides" in device and dhcp in [ "yes", f"ipv{version}", ]: dhcp_overrides = device[f"dhcp{version}-overrides"] for k, v in dhcp_config_maps.items(): if v in dhcp_overrides: cfg.update_section(f"DHCPv{version}", k, dhcp_overrides[v]) 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: NetworkState, templates: Optional[dict] = None, target=None, ) -> None: network_dir = self.network_conf_dir if target: network_dir = subp.target_path(target) + network_dir util.ensure_dir(network_dir) ret_dict = self._render_content(network_state) for k, v in ret_dict.items(): self.create_network_file(k, v, network_dir) def _render_content(self, ns: NetworkState) -> dict: ret_dict = {} for iface in ns.iter_interfaces(): cfg = CfgParser() link = self.generate_match_section(iface, cfg) self.generate_link_section(iface, cfg) dhcp = self.parse_subnets(iface, cfg) self.parse_dns(iface, cfg, ns) rid = 0 for route in ns.iter_routes(): # Use "c" as a dict key prefix for this route to isolate it # from other sources of routes self.parse_routes(f"c{rid}", route, cfg) rid = rid + 1 if ns.version == 2: name: Optional[str] = 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 if name in ns.config["ethernets"]: device = ns.config["ethernets"][name] # dhcp{version}domain are extra keys only present in # VMware config self.dhcp_domain(device, cfg) for version in ["4", "6"]: if ( f"dhcp{version}domain" in device and "use-domains" in device.get(f"dhcp{version}-overrides", {}) ): exception = ( f"{name} has both dhcp{version}domain" f" and dhcp{version}-overrides.use-domains" f" configured. Use one" ) raise Exception(exception) self.parse_dhcp_overrides(cfg, device, dhcp, version) 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: NetworkState): renderer = Renderer({}) return renderer._render_content(ns)
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