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networkd: add support for resolved hook for DHCP server

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Let's synthesize DNS RRs for leases handed out by our DHCP server. This
way local VMs can have resolvable hostnames locally.

This does not implement reverse look ups for now. We can add this
later in similar fashion.
This commit is contained in:
Lennart Poettering
2025-11-15 07:52:42 +01:00
parent f041d40dee
commit a7fa29b1b5
21 changed files with 434 additions and 15 deletions
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test/networkd-test.py
+15 -1
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@@ -65,6 +65,7 @@ def setUpModule():
for u in [
'systemd-networkd.socket',
'systemd-networkd-varlink.socket',
'systemd-networkd-resolve-hook.socket',
'systemd-networkd.service',
'systemd-resolved-varlink.socket',
'systemd-resolved-monitor.socket',
@@ -90,12 +91,15 @@ def setUpModule():
subprocess.call(['useradd', '--system', '--no-create-home', 'systemd-network'])
for d in ['/etc/systemd/network', '/run/systemd/network',
'/run/systemd/netif', '/run/systemd/resolve']:
'/run/systemd/netif', '/run/systemd/resolve', '/run/systemd/resolve.hook']:
subprocess.check_call(["mount", "-m", "-t", "tmpfs", "none", d])
tmpmounts.append(d)
if os.path.isdir('/run/systemd/resolve'):
os.chmod('/run/systemd/resolve', 0o755)
shutil.chown('/run/systemd/resolve', 'systemd-resolve', 'systemd-resolve')
if os.path.isdir('/run/systemd/resolve.hook'):
os.chmod('/run/systemd/resolve.hook', 0o755)
shutil.chown('/run/systemd/resolve.hook', 'systemd-network', 'systemd-network')
if os.path.isdir('/run/systemd/netif'):
os.chmod('/run/systemd/netif', 0o755)
shutil.chown('/run/systemd/netif', 'systemd-network', 'systemd-network')
@@ -278,6 +282,8 @@ Gateway=192.168.250.1
def tearDown(self):
subprocess.check_call(['systemctl', 'stop', 'systemd-networkd.socket'])
subprocess.check_call(['systemctl', 'stop', 'systemd-networkd-varlink.socket'])
subprocess.check_call(['systemctl', 'stop', 'systemd-networkd-resolve-hook.socket'])
subprocess.check_call(['systemctl', 'stop', 'systemd-networkd.service'])
subprocess.check_call(['ip', 'link', 'del', 'mybridge'])
subprocess.check_call(['ip', 'link', 'del', 'port1'])
@@ -373,6 +379,8 @@ class ClientTestBase(NetworkdTestingUtilities):
def tearDown(self):
self.shutdown_iface()
subprocess.call(['systemctl', 'stop', 'systemd-networkd.socket'])
subprocess.call(['systemctl', 'stop', 'systemd-networkd-varlink.socket'])
subprocess.call(['systemctl', 'stop', 'systemd-networkd-resolve-hook.socket'])
subprocess.call(['systemctl', 'stop', 'systemd-networkd.service'])
subprocess.call(['ip', 'link', 'del', 'dummy0'],
stderr=subprocess.DEVNULL)
@@ -930,9 +938,11 @@ class NetworkdClientTest(ClientTestBase, unittest.TestCase):
set -eu
mkdir -p /run/systemd/network
mkdir -p /run/systemd/netif
mkdir -p /run/systemd/resolve.hook
mkdir -p /var/lib/systemd/network
mount -t tmpfs none /run/systemd/network
mount -t tmpfs none /run/systemd/netif
mount -t tmpfs none /run/systemd/resolve.hook
mount -t tmpfs none /var/lib/systemd/network
[ ! -e /run/dbus ] || mount -t tmpfs none /run/dbus
# create router/client veth pair
@@ -966,6 +976,9 @@ EOF
# Hence, 'networkctl persistent-storage yes' cannot be used.
export SYSTEMD_NETWORK_PERSISTENT_STORAGE_READY=1
# Don't try to register resolved hook for our testcase
export SYSTEMD_NETWORK_RESOLVE_HOOK=0
# Generate debugging logs.
export SYSTEMD_LOG_LEVEL=debug
@@ -982,6 +995,7 @@ exec $(systemctl cat systemd-networkd.service | sed -n '/^ExecStart=/ {{ s/^.*=/
'-p', 'InaccessibleDirectories=-/etc/systemd/network',
'-p', 'InaccessibleDirectories=-/run/systemd/network',
'-p', 'InaccessibleDirectories=-/run/systemd/netif',
'-p', 'InaccessibleDirectories=-/run/systemd/resolve.hook',
'-p', 'InaccessibleDirectories=-/var/lib/systemd/network',
'--service-type=notify', script])