diff options
Diffstat (limited to 'cloudinit/sources/helpers/azure.py')
| -rw-r--r-- | cloudinit/sources/helpers/azure.py | 99 |
1 files changed, 87 insertions, 12 deletions
diff --git a/cloudinit/sources/helpers/azure.py b/cloudinit/sources/helpers/azure.py index 63ccf10e..6e43440f 100644 --- a/cloudinit/sources/helpers/azure.py +++ b/cloudinit/sources/helpers/azure.py @@ -1,3 +1,4 @@ +import json import logging import os import re @@ -6,6 +7,7 @@ import struct import tempfile import time +from cloudinit import stages from contextlib import contextmanager from xml.etree import ElementTree @@ -187,19 +189,32 @@ class WALinuxAgentShim(object): ' </Container>', '</Health>']) - def __init__(self): + def __init__(self, fallback_lease_file=None): LOG.debug('WALinuxAgentShim instantiated...') - self.endpoint = self.find_endpoint() + self.dhcpoptions = None + self._endpoint = None self.openssl_manager = None self.values = {} + self.lease_file = fallback_lease_file def clean_up(self): if self.openssl_manager is not None: self.openssl_manager.clean_up() @staticmethod - def get_ip_from_lease_value(lease_value): - unescaped_value = lease_value.replace('\\', '') + def _get_hooks_dir(): + _paths = stages.Init() + return os.path.join(_paths.paths.get_runpath(), "dhclient.hooks") + + @property + def endpoint(self): + if self._endpoint is None: + self._endpoint = self.find_endpoint(self.lease_file) + return self._endpoint + + @staticmethod + def get_ip_from_lease_value(fallback_lease_value): + unescaped_value = fallback_lease_value.replace('\\', '') if len(unescaped_value) > 4: hex_string = '' for hex_pair in unescaped_value.split(':'): @@ -213,15 +228,75 @@ class WALinuxAgentShim(object): return socket.inet_ntoa(packed_bytes) @staticmethod - def find_endpoint(): - LOG.debug('Finding Azure endpoint...') - content = util.load_file('/var/lib/dhcp/dhclient.eth0.leases') - value = None + def _get_value_from_leases_file(fallback_lease_file): + leases = [] + content = util.load_file(fallback_lease_file) + LOG.debug("content is {}".format(content)) for line in content.splitlines(): if 'unknown-245' in line: - value = line.strip(' ').split(' ', 2)[-1].strip(';\n"') + # Example line from Ubuntu + # option unknown-245 a8:3f:81:10; + leases.append(line.strip(' ').split(' ', 2)[-1].strip(';\n"')) + # Return the "most recent" one in the list + if len(leases) < 1: + return None + else: + return leases[-1] + + @staticmethod + def _load_dhclient_json(): + dhcp_options = {} + hooks_dir = WALinuxAgentShim._get_hooks_dir() + if not os.path.exists(hooks_dir): + LOG.debug("%s not found.", hooks_dir) + return None + hook_files = [os.path.join(hooks_dir, x) + for x in os.listdir(hooks_dir)] + for hook_file in hook_files: + try: + name = os.path.basename(hook_file).replace('.json', '') + dhcp_options[name] = json.loads(util.load_file((hook_file))) + except ValueError: + raise ValueError("%s is not valid JSON data", hook_file) + return dhcp_options + + @staticmethod + def _get_value_from_dhcpoptions(dhcp_options): + if dhcp_options is None: + return None + # the MS endpoint server is given to us as DHPC option 245 + _value = None + for interface in dhcp_options: + _value = dhcp_options[interface].get('unknown_245', None) + if _value is not None: + LOG.debug("Endpoint server found in dhclient options") + break + return _value + + @staticmethod + def find_endpoint(fallback_lease_file=None): + LOG.debug('Finding Azure endpoint...') + value = None + # Option-245 stored in /run/cloud-init/dhclient.hooks/<ifc>.json + # a dhclient exit hook that calls cloud-init-dhclient-hook + dhcp_options = WALinuxAgentShim._load_dhclient_json() + value = WALinuxAgentShim._get_value_from_dhcpoptions(dhcp_options) if value is None: - raise ValueError('No endpoint found in DHCP config.') + # Fallback and check the leases file if unsuccessful + LOG.debug("Unable to find endpoint in dhclient logs. " + " Falling back to check lease files") + if fallback_lease_file is None: + LOG.warn("No fallback lease file was specified.") + value = None + else: + LOG.debug("Looking for endpoint in lease file %s", + fallback_lease_file) + value = WALinuxAgentShim._get_value_from_leases_file( + fallback_lease_file) + + if value is None: + raise ValueError('No endpoint found.') + endpoint_ip_address = WALinuxAgentShim.get_ip_from_lease_value(value) LOG.debug('Azure endpoint found at %s', endpoint_ip_address) return endpoint_ip_address @@ -271,8 +346,8 @@ class WALinuxAgentShim(object): LOG.info('Reported ready to Azure fabric.') -def get_metadata_from_fabric(): - shim = WALinuxAgentShim() +def get_metadata_from_fabric(fallback_lease_file=None): + shim = WALinuxAgentShim(fallback_lease_file=fallback_lease_file) try: return shim.register_with_azure_and_fetch_data() finally: |