Agent: Listen for connections on both IPv4 and IPv6 ports

Allow connections if deploying over a IPv6 network.

Change-Id: Ied2f6be4aa4d1a70524df1df3506e596f6926e5b
Closes-Bug: #1650539

ironic_python_agent/agent.py

@@ -23,6 +23,7 @@ import time
 from oslo_concurrency import processutils
 from oslo_config import cfg
 from oslo_log import log
+from oslo_utils import netutils
 import pkg_resources
 from six.moves.urllib import parse as urlparse
 from stevedore import extension
@@ -365,6 +366,10 @@ class IronicPythonAgent(base.ExecuteCommandMixin):
                 LOG.error('Neither ipa-api-url nor inspection_callback_url'
                           'found, please check your pxe append parameters.')
 
+        if netutils.is_ipv6_enabled():
+            # Listens to both IP versions, assuming IPV6_V6ONLY isn't enabled,
+            # (the default behaviour in linux)
+            simple_server.WSGIServer.address_family = socket.AF_INET6
         wsgi = simple_server.make_server(
             self.listen_address.hostname,
             self.listen_address.port,

ironic_python_agent/api/config.py

@@ -12,11 +12,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from ironic_python_agent import netutils
+
 # Server Specific Configurations
 # See https://pecan.readthedocs.org/en/latest/configuration.html#server-configuration # noqa
 server = {
     'port': '9999',
-    'host': '0.0.0.0'
+    'host': netutils.get_wildcard_address()
 }
 
 # Pecan Application Configurations

ironic_python_agent/config.py

@@ -15,6 +15,7 @@
 from oslo_config import cfg
 
 from ironic_python_agent import inspector
+from ironic_python_agent import netutils
 from ironic_python_agent import utils
 
 CONF = cfg.CONF
@@ -31,7 +32,9 @@ cli_opts = [
                     'The value must start with either http:// or https://.'),
 
     cfg.StrOpt('listen_host',
-               default=APARAMS.get('ipa-listen-host', '0.0.0.0'),
+               default=APARAMS.get('ipa-listen-host',
+                                   netutils.get_wildcard_address()),
+               sample_default='::',
                deprecated_name='listen-host',
                help='The IP address to listen on. '
                     'Can be supplied as "ipa-listen-host" kernel parameter.'),

ironic_python_agent/netutils.py

@@ -220,3 +220,9 @@ def wrap_ipv6(ip):
     if netutils.is_valid_ipv6(ip):
         return "[%s]" % ip
     return ip
+
+
+def get_wildcard_address():
+    if netutils.is_ipv6_enabled():
+        return "::"
+    return "0.0.0.0"

ironic_python_agent/tests/functional/base.py

@@ -24,6 +24,7 @@ from ironic_python_agent import agent
 # NOTE(lucasagomes): This import is needed so we can register the
 # configuration options prior to IPA prior to starting the service
 from ironic_python_agent import config  # noqa
+from ironic_python_agent import netutils
 
 
 class FunctionalBase(test_base.BaseTestCase):
@@ -40,7 +41,8 @@ class FunctionalBase(test_base.BaseTestCase):
         self.agent = agent.IronicPythonAgent(
             api_url='http://127.0.0.1:6835',
             advertise_address=agent.Host('localhost', 9999),
-            listen_address=agent.Host('0.0.0.0', int(self.test_port)),
+            listen_address=agent.Host(netutils.get_wildcard_address(),
+                                      int(self.test_port)),
             ip_lookup_attempts=3,
             ip_lookup_sleep=10,
             network_interface=None,

releasenotes/notes/ipv6-listen-85d40e58156e398f.yaml

@@ -0,0 +1,5 @@
+---
+fixes:
+  - If booted into a kernel that supports IPv6 Ironic Python Agent
+    now listens for connections on both the IPv4 and IPv6 wildcard
+    address.