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authorsarthurdev <965089+sarthurdev@users.noreply.github.com>2024-01-09 22:48:55 +0100
committersarthurdev <965089+sarthurdev@users.noreply.github.com>2024-01-10 22:16:21 +0100
commitb68def8d50688eb429328892437647860f9fc6c1 (patch)
treec5035a78c9f0a436b932c43e2ad3bd0df4191733
parent348892a97be2c2dfb810422fb94fe4eabe5d6a42 (diff)
downloadvyos-1x-b68def8d50688eb429328892437647860f9fc6c1.tar.gz
vyos-1x-b68def8d50688eb429328892437647860f9fc6c1.zip
dhcp: T5787: Prevent duplicate IP addresses on static mappings
-rwxr-xr-xsmoketest/scripts/cli/test_service_dhcp-server.py7
-rwxr-xr-xsrc/conf_mode/service_dhcp-server.py6
2 files changed, 13 insertions, 0 deletions
diff --git a/smoketest/scripts/cli/test_service_dhcp-server.py b/smoketest/scripts/cli/test_service_dhcp-server.py
index 093e43494..91ae901cd 100755
--- a/smoketest/scripts/cli/test_service_dhcp-server.py
+++ b/smoketest/scripts/cli/test_service_dhcp-server.py
@@ -202,6 +202,13 @@ class TestServiceDHCPServer(VyOSUnitTestSHIM.TestCase):
self.cli_set(pool + ['static-mapping', client, 'ip-address', inc_ip(subnet, client_base)])
client_base += 1
+ # cannot have mappings with duplicate IP addresses
+ with self.assertRaises(ConfigSessionError):
+ self.cli_set(pool + ['static-mapping', 'dupe1', 'mac', '00:50:00:00:00:01'])
+ self.cli_set(pool + ['static-mapping', 'dupe1', 'ip-address', inc_ip(subnet, 10)])
+ self.cli_commit()
+ self.cli_delete(pool + ['static-mapping', 'dupe1'])
+
# commit changes
self.cli_commit()
diff --git a/src/conf_mode/service_dhcp-server.py b/src/conf_mode/service_dhcp-server.py
index ac7d95632..8d849b1e6 100755
--- a/src/conf_mode/service_dhcp-server.py
+++ b/src/conf_mode/service_dhcp-server.py
@@ -214,6 +214,7 @@ def verify(dhcp):
if 'static_mapping' in subnet_config:
# Static mappings require just a MAC address (will use an IP from the dynamic pool if IP is not set)
+ used_ips = []
for mapping, mapping_config in subnet_config['static_mapping'].items():
if 'ip_address' in mapping_config:
if ip_address(mapping_config['ip_address']) not in ip_network(subnet):
@@ -224,6 +225,11 @@ def verify(dhcp):
raise ConfigError(f'MAC address required for static mapping "{mapping}"\n' \
f'within shared-network "{network}, {subnet}"!')
+ if mapping_config['ip_address'] in used_ips:
+ raise ConfigError(f'Configured IP address for static mapping "{mapping}" exists on another static mapping')
+
+ used_ips.append(mapping_config['ip_address'])
+
# There must be one subnet connected to a listen interface.
# This only counts if the network itself is not disabled!
if 'disable' not in network_config: