test-network: add testcase for [DHCPServer] ServerAddress= with null address

diff --git a/test/test-network/conf/25-dhcp-server-null-server-address.network b/test/test-network/conf/25-dhcp-server-null-server-address.network
new file mode 100644 (file)
index 0000000..fff83f4
--- /dev/null
+++ b/test/test-network/conf/25-dhcp-server-null-server-address.network
@@ -0,0 +1,14 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+[Match]
+Name=veth-peer
+
+[Network]
+IPv6AcceptRA=false
+DHCPServer=yes
+
+[DHCPServer]
+ServerAddress=0.0.0.0/24
+PoolOffset=10
+PoolSize=50
+DNS=_server_address
+NTP=_server_address

diff --git a/test/test-network/systemd-networkd-tests.py b/test/test-network/systemd-networkd-tests.py
index 90d68b54db717ec2dc54b6814c67db5b7a3e54c6..9d1b273f95af3fe28298ae77e537a227d55275e1 100755 (executable)
--- a/test/test-network/systemd-networkd-tests.py
+++ b/test/test-network/systemd-networkd-tests.py
@@ -4935,6 +4935,29 @@ class NetworkdDHCPServerTests(unittest.TestCase, Utilities):
         output = check_output(*networkctl_cmd, '-n', '0', 'status', 'veth-peer', env=env)
         self.assertRegex(output, "Offered DHCP leases: 192.168.5.[0-9]*")
 
+    def test_dhcp_server_null_server_address(self):
+        copy_network_unit('25-veth.netdev', '25-dhcp-client.network', '25-dhcp-server-null-server-address.network')
+        start_networkd()
+        self.wait_online(['veth99:routable', 'veth-peer:routable'])
+
+        output = check_output('ip --json address show dev veth-peer')
+        server_address = json.loads(output)[0]['addr_info'][0]['local']
+        print(server_address)
+
+        output = check_output('ip --json address show dev veth99')
+        client_address = json.loads(output)[0]['addr_info'][0]['local']
+        print(client_address)
+
+        output = check_output(*networkctl_cmd, '-n', '0', 'status', 'veth99', env=env)
+        print(output)
+        self.assertRegex(output, rf'Address: {client_address} \(DHCP4 via {server_address}\)')
+        self.assertIn(f'Gateway: {server_address}', output)
+        self.assertIn(f'DNS: {server_address}', output)
+        self.assertIn(f'NTP: {server_address}', output)
+
+        output = check_output(*networkctl_cmd, '-n', '0', 'status', 'veth-peer', env=env)
+        self.assertIn(f'Offered DHCP leases: {client_address}', output)
+
     def test_dhcp_server_with_uplink(self):
         copy_network_unit('25-veth.netdev', '25-dhcp-client.network', '25-dhcp-server-downstream.network',
                           '12-dummy.netdev', '25-dhcp-server-uplink.network')