dhcp: T3316: Kea DHCP and DHCPv6 fixes

* Move Kea socket permission change on-demand and speed up conf scripts
* Fix issue with DHCP reservations when no `ip-address` value

4 files changed, 17 insertions, 26 deletions

diff --git a/python/vyos/kea.py b/python/vyos/kea.py
index cb341e0f2..4a517da5f 100644
--- a/python/vyos/kea.py
+++ b/python/vyos/kea.py
@@ -23,7 +23,9 @@ from vyos.template import is_ipv6
 from vyos.template import isc_static_route
 from vyos.template import netmask_from_cidr
 from vyos.utils.dict import dict_search_args
+from vyos.utils.file import file_permissions
 from vyos.utils.file import read_file
+from vyos.utils.process import cmd
 
 kea4_options = {
     'name_server': 'domain-name-servers',
@@ -119,10 +121,14 @@ def kea_parse_subnet(subnet, config):
             if 'disable' in host_config:
                 continue
 
-            reservations.append({
-                'hw-address': host_config['mac_address'],
-                'ip-address': host_config['ip_address']
-            })
+            obj = {
+                'hw-address': host_config['mac_address']
+            }
+
+            if 'ip_address' in host_config:
+                obj['ip-address'] = host_config['ip_address']
+
+            reservations.append(obj)
         out['reservations'] = reservations
 
     unifi_controller = dict_search_args(config, 'vendor_option', 'ubiquiti', 'unifi_controller')
@@ -275,6 +281,9 @@ def _ctrl_socket_command(path, command, args=None):
     if not os.path.exists(path):
         return None
 
+    if file_permissions(path) != '0775':
+        cmd(f'sudo chmod 775 {path}')
+
     with socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) as sock:
         sock.connect(path)
 
diff --git a/python/vyos/utils/file.py b/python/vyos/utils/file.py
index 2af87a0ca..70ac1753b 100644
--- a/python/vyos/utils/file.py
+++ b/python/vyos/utils/file.py
@@ -149,6 +149,10 @@ def chmod_775(path):
               S_IROTH | S_IXOTH
     chmod(path, bitmask)
 
+def file_permissions(path):
+    """ Return file permissions in string format, e.g '0755' """
+    return oct(os.stat(path).st_mode)[4:]
+
 def makedir(path, user=None, group=None):
     if os.path.exists(path):
         return
diff --git a/src/conf_mode/dhcp_server.py b/src/conf_mode/dhcp_server.py
index 66f7c8057..958e90014 100755
--- a/src/conf_mode/dhcp_server.py
+++ b/src/conf_mode/dhcp_server.py
@@ -21,7 +21,6 @@ from ipaddress import ip_network
 from netaddr import IPAddress
 from netaddr import IPRange
 from sys import exit
-from time import sleep
 
 from vyos.config import Config
 from vyos.pki import wrap_certificate
@@ -29,7 +28,6 @@ from vyos.pki import wrap_private_key
 from vyos.template import render
 from vyos.utils.dict import dict_search
 from vyos.utils.dict import dict_search_args
-from vyos.utils.file import chmod_775
 from vyos.utils.file import write_file
 from vyos.utils.process import call
 from vyos.utils.process import run
@@ -362,15 +360,6 @@ def apply(dhcp):
 
         call(f'systemctl {action} {service}.service')
 
-    # op-mode needs ctrl socket permission change
-    i = 0
-    while not os.path.exists(ctrl_socket):
-        if i > 15:
-            break
-        i += 1
-        sleep(1)
-    chmod_775(ctrl_socket)
-
     return None
 
 if __name__ == '__main__':
diff --git a/src/conf_mode/dhcpv6_server.py b/src/conf_mode/dhcpv6_server.py
index 73a708ff5..b01f510e5 100755
--- a/src/conf_mode/dhcpv6_server.py
+++ b/src/conf_mode/dhcpv6_server.py
@@ -19,13 +19,11 @@ import os
 from ipaddress import ip_address
 from ipaddress import ip_network
 from sys import exit
-from time import sleep
 
 from vyos.config import Config
 from vyos.template import render
 from vyos.template import is_ipv6
 from vyos.utils.process import call
-from vyos.utils.file import chmod_775
 from vyos.utils.file import write_file
 from vyos.utils.dict import dict_search
 from vyos.utils.network import is_subnet_connected
@@ -197,15 +195,6 @@ def apply(dhcpv6):
 
     call(f'systemctl restart {service_name}')
 
-    # op-mode needs ctrl socket permission change
-    i = 0
-    while not os.path.exists(ctrl_socket):
-        if i > 15:
-            break
-        i += 1
-        sleep(1)
-    chmod_775(ctrl_socket)
-
     return None
 
 if __name__ == '__main__':