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PATH : /lib/python3/dist-packages/cloudinit/sources/helpers/

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# Author: Eric Benner <ebenner@vultr.com>
#
# This file is part of cloud-init. See LICENSE file for license information.

import json
import logging
import os
from functools import lru_cache

from requests import exceptions

from cloudinit import dmi, net, subp, url_helper, util
from cloudinit.net.dhcp import NoDHCPLeaseError
from cloudinit.net.ephemeral import EphemeralDHCPv4

# Get LOG
LOG = logging.getLogger(__name__)

@lru_cache()
def get_metadata(
    distro, url, timeout, retries, sec_between, agent, tmp_dir=None
):
    # Bring up interface (and try until one works)
    exception = RuntimeError("Failed to DHCP")

# Seek iface with DHCP
    for iface in get_interface_list():
        try:
            with EphemeralDHCPv4(
                distro,
                iface=iface,
                connectivity_urls_data=[{"url": url}],
            ):
                # Fetch the metadata
                v1 = read_metadata(url, timeout, retries, sec_between, agent)

metadata = json.loads(v1)
                refactor_metadata(metadata)
                return metadata
        except (
            NoDHCPLeaseError,
            subp.ProcessExecutionError,
            RuntimeError,
            exceptions.RequestException,
        ) as exc:
            LOG.error("DHCP Exception: %s", exc)
            exception = exc
    raise exception

# Refactor metadata into acceptable format
def refactor_metadata(metadata):
    metadata["instance-id"] = metadata["instance-v2-id"]
    metadata["local-hostname"] = metadata["hostname"]
    region = metadata["region"]["regioncode"]
    if "countrycode" in metadata["region"]:
        region = metadata["region"]["countrycode"]
    metadata["region"] = region.lower()

# Get interface list, sort, and clean
def get_interface_list():
    # Check for the presence of a "find_candidate_nics.sh" shell script on the
    # running guest image. Use that as an optional source of truth before
    # falling back to "net.find_candidate_nics()". This allows the Vultr team
    # to provision machines with niche hardware configurations at the same
    # cadence as image rollouts.
    ifaces = []
    try:
        nic_script = "/opt/vultr/find_candidate_nics.sh"
        if os.path.exists(nic_script):
            out = subp.subp(nic_script, capture=True, shell=True)
            for line in out.stdout.splitlines():
                iface = line.strip()
                if len(iface) > 0:
                    ifaces.append(iface)
    except Exception as e:
        LOG.error("find_candidate_nics script exception: %s", e)

if len(ifaces) == 0:
        for iface in net.find_candidate_nics():
            # Skip dummy
            if "dummy" in iface:
                continue
            ifaces.append(iface)

return ifaces

# Read the system information from SMBIOS
def get_sysinfo():
    return {
        "manufacturer": dmi.read_dmi_data("system-manufacturer"),
        "subid": dmi.read_dmi_data("system-serial-number"),
    }

# Assumes is Vultr is already checked
def is_baremetal():
    if get_sysinfo()["manufacturer"] != "Vultr":
        return True
    return False

# Confirm is Vultr
def is_vultr():
    # VC2, VDC, and HFC use DMI
    sysinfo = get_sysinfo()

if sysinfo["manufacturer"] == "Vultr":
        return True

# Baremetal requires a kernel parameter
    if "vultr" in util.get_cmdline().split():
        return True

return False

# Read Metadata endpoint
def read_metadata(url, timeout, retries, sec_between, agent):
    url = "%s/v1.json" % url

# Announce os details so we can handle non Vultr origin
    # images and provide correct vendordata generation.
    headers = {"Metadata-Token": "cloudinit", "User-Agent": agent}

response = url_helper.readurl(
        url,
        timeout=timeout,
        retries=retries,
        headers=headers,
        sec_between=sec_between,
    )

if not response.ok():
        raise RuntimeError(
            "Failed to connect to %s: Code: %s" % url, response.code
        )

return response.contents.decode()

# Wrapped for caching
@lru_cache()
def get_interface_map():
    return net.get_interfaces_by_mac()

# Convert macs to nics
def get_interface_name(mac):
    macs_to_nic = get_interface_map()

if mac not in macs_to_nic:
        return None

return macs_to_nic.get(mac)

# Generate network configs
def generate_network_config(interfaces):
    network = {
        "version": 1,
        "config": [
            {
                "type": "nameserver",
                "address": ["108.61.10.10", "2001:19f0:300:1704::6"],
            }
        ],
    }

# Prepare interface 0, public
    if len(interfaces) > 0:
        public = generate_interface(interfaces[0], primary=True)
        network["config"].append(public)

# Prepare additional interfaces, private
    for i in range(1, len(interfaces)):
        interface = interfaces[i]

# Skip interfaces set not to be configured
        if interface.get("unconfigured"):
            continue

private = generate_interface(interface)
        network["config"].append(private)

return network

def generate_interface(interface, primary=False):
    interface_name = get_interface_name(interface["mac"])
    if not interface_name:
        raise RuntimeError(
            "Interface: %s could not be found on the system" % interface["mac"]
        )

netcfg = {
        "name": interface_name,
        "type": "physical",
        "mac_address": interface["mac"],
    }

if primary:
        netcfg["accept-ra"] = 1
        netcfg["subnets"] = [
            {"type": "dhcp", "control": "auto"},
            {"type": "ipv6_slaac", "control": "auto"},
        ]

if not primary:
        netcfg["subnets"] = [
            {
                "type": "static",
                "control": "auto",
                "address": interface["ipv4"]["address"],
                "netmask": interface["ipv4"]["netmask"],
            }
        ]

generate_interface_routes(interface, netcfg)
    generate_interface_additional_addresses(interface, netcfg)

# Add config to template
    return netcfg

def generate_interface_routes(interface, netcfg):
    # Options that may or may not be used
    if "mtu" in interface:
        netcfg["mtu"] = interface["mtu"]

if "accept-ra" in interface:
        netcfg["accept-ra"] = interface["accept-ra"]

if "routes" in interface:
        netcfg["subnets"][0]["routes"] = interface["routes"]

def generate_interface_additional_addresses(interface, netcfg):
    # Check for additional IP's
    additional_count = len(interface["ipv4"]["additional"])
    if "ipv4" in interface and additional_count > 0:
        for additional in interface["ipv4"]["additional"]:
            add = {
                "type": "static",
                "control": "auto",
                "address": additional["address"],
                "netmask": additional["netmask"],
            }

if "routes" in additional:
                add["routes"] = additional["routes"]

netcfg["subnets"].append(add)

# Check for additional IPv6's
    additional_count = len(interface["ipv6"]["additional"])
    if "ipv6" in interface and additional_count > 0:
        for additional in interface["ipv6"]["additional"]:
            add = {
                "type": "static6",
                "control": "auto",
                "address": "%s/%s"
                % (additional["network"], additional["prefix"]),
            }

if "routes" in additional:
                add["routes"] = additional["routes"]

netcfg["subnets"].append(add)

# Make required adjustments to the network configs provided
def add_interface_names(netcfg):
    for interface in netcfg["config"]:
        if interface["type"] != "physical":
            continue
        interface_name = get_interface_name(interface["mac_address"])
        if not interface_name:
            raise RuntimeError(
                "Interface: %s could not be found on the system"
                % interface["mac_address"]
            )
        interface["name"] = interface_name

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