dhcp: T3626: Prevent to disable only one configured network

(cherry picked from commit 9c825a3457a88a4eebc6475f92332822e5102889)

1 files changed, 10 insertions, 0 deletions

diff --git a/src/conf_mode/dhcp_server.py b/src/conf_mode/dhcp_server.py
index 28f2a4ca5..71b71879c 100755
--- a/src/conf_mode/dhcp_server.py
+++ b/src/conf_mode/dhcp_server.py
@@ -151,9 +151,15 @@ def verify(dhcp):
     listen_ok = False
     subnets = []
     failover_ok = False
+    shared_networks =  len(dhcp['shared_network_name'])
+    disabled_shared_networks = 0
+
 
     # A shared-network requires a subnet definition
     for network, network_config in dhcp['shared_network_name'].items():
+        if 'disable' in network_config:
+            disabled_shared_networks += 1
+
         if 'subnet' not in network_config:
             raise ConfigError(f'No subnets defined for {network}. At least one\n' \
                               'lease subnet must be configured.')
@@ -243,6 +249,10 @@ def verify(dhcp):
                     if net.overlaps(net2):
                         raise ConfigError('Conflicting subnet ranges: "{net}" overlaps "{net2}"!')
 
+    # Prevent 'disable' for shared-network if only one network is configured
+    if (shared_networks - disabled_shared_networks) < 1:
+        raise ConfigError(f'At least one shared network must be active!')
+
     if 'failover' in dhcp:
         if not failover_ok:
             raise ConfigError('DHCP failover must be enabled for at least one subnet!')