feat: Add Docker link carrier and interface status support

gns3server/api/routes/compute/docker_nodes.py

@@ -307,6 +307,7 @@ async def update_docker_node_nio(
     if nio_data.filters:
         nio.filters = nio_data.filters
     nio.markers = nio_data.markers or {}
+    nio.suspend = nio_data.suspend
     await node.adapter_update_nio_binding(adapter_number, nio)
     return nio.asdict()
 

gns3server/compute/docker/docker_vm.py

@@ -20,6 +20,8 @@ Docker container instance.
 
 import sys
 import asyncio
+import contextlib
+import json
 import shutil
 import psutil
 import shlex
@@ -92,6 +94,7 @@ class DockerVM(BaseNode):
         "/sbin/udevadm",
         "/usr/bin/udevadm",
     )
+    _INTERFACE_STATUS_RESYNC_INTERVAL = 10
 
     def __init__(
         self,
@@ -151,6 +154,10 @@ class DockerVM(BaseNode):
         self._permissions_fixed = True
         self._display = None
         self._closing = False
+        self._interface_monitor_writer = None
+        self._interface_monitor_task = None
+        self._interface_statuses = {}
+        self._interface_status_times = {}
 
         self._volumes = []
         # Keep a list of created bridge
@@ -863,6 +870,8 @@ class DockerVM(BaseNode):
         if state == "paused":
             await self.unpause()
         elif state == "running":
+            self.status = "started"
+            await self._start_interface_monitor()
             return
         else:
 
@@ -911,6 +920,7 @@ class DockerVM(BaseNode):
 
         self._permissions_fixed = False
         self.status = "started"
+        await self._start_interface_monitor()
         log.debug(
             "Docker container '{name}' [{image}] started listen for {console_type} on {console}".format(
                 name=self._name, image=self._image, console=self.console, console_type=self.console_type
@@ -1226,7 +1236,9 @@ class DockerVM(BaseNode):
         Restart this Docker container.
         """
 
+        await self._stop_interface_monitor()
         await self.manager.query("POST", f"containers/{self._cid}/restart")
+        await self._start_interface_monitor()
         log.debug("Docker container '{name}' [{image}] restarted".format(name=self._name, image=self._image))
 
     def _cleanup_console_resources(self):
@@ -1258,6 +1270,7 @@ class DockerVM(BaseNode):
         """
 
         try:
+            await self._stop_interface_monitor()
             if self._console_websocket:
                 await self._console_websocket.close()
                 self._console_websocket = None
@@ -1393,6 +1406,158 @@ class DockerVM(BaseNode):
         """
         return f"eth{adapter_number}"
 
+    async def _start_interface_monitor(self):
+        """Monitor administrative state changes for this container's adapters.
+
+        Docker does not expose guest ``ip link set`` changes as daemon events.
+        Run one small BusyBox loop through the Engine exec API and keep its
+        hijacked output stream open.  The loop samples all GNS3 interfaces in
+        one process; notifications are emitted on changes and periodically to
+        resynchronize newly connected Web UI clients.
+        """
+
+        if self._interface_monitor_task and not self._interface_monitor_task.done():
+            return
+
+        await self._stop_interface_monitor()
+        if not self._cid or not self.adapters:
+            return
+
+        interface_names = [self._get_container_ifname(adapter_number) for adapter_number in range(self.adapters)]
+        script = (
+            "while :; do "
+            "for ifname do "
+            "flags=$(/gns3/bin/busybox cat \"/sys/class/net/$ifname/flags\" 2>/dev/null) || continue; "
+            "/gns3/bin/busybox printf '%s=%s\\n' \"$ifname\" \"$flags\"; "
+            "done; "
+            "/gns3/bin/busybox sleep 1; "
+            "done"
+        )
+
+        try:
+            result = await self.manager.query(
+                "POST",
+                f"containers/{self._cid}/exec",
+                data={
+                    "AttachStdout": True,
+                    "AttachStderr": False,
+                    "Tty": True,
+                    "User": "root",
+                    "Cmd": ["/gns3/bin/busybox", "sh", "-c", script, "sh", *interface_names],
+                },
+            )
+            exec_id = result["Id"]
+            reader, writer = await asyncio.open_unix_connection(self.manager._server_url)
+            body = json.dumps({"Detach": False, "Tty": True})
+            request = (
+                f"POST /v{self.manager._api_version}/exec/{exec_id}/start HTTP/1.1\r\n"
+                "Host: docker\r\n"
+                "Connection: Upgrade\r\n"
+                "Upgrade: tcp\r\n"
+                "Content-Type: application/json\r\n"
+                f"Content-Length: {len(body)}\r\n\r\n{body}"
+            ).encode()
+            writer.write(request)
+            await writer.drain()
+            headers = await asyncio.wait_for(reader.readuntil(b"\r\n\r\n"), timeout=5)
+            status_line = headers.split(b"\r\n", 1)[0]
+            if b" 101 " not in status_line and b" 200 " not in status_line:
+                raise DockerError(f"Docker interface monitor was rejected: {status_line.decode(errors='ignore')}")
+        except (
+            DockerError,
+            OSError,
+            KeyError,
+            TypeError,
+            RuntimeError,
+            asyncio.IncompleteReadError,
+            asyncio.TimeoutError,
+        ) as e:
+            if 'writer' in locals():
+                await self._close_interface_monitor_writer(writer)
+            log.warning("Could not monitor interfaces for Docker container '%s': %s", self.name, e)
+            return
+
+        self._interface_statuses.clear()
+        self._interface_status_times.clear()
+        self._interface_monitor_writer = writer
+        self._interface_monitor_task = asyncio.create_task(self._read_interface_statuses(reader))
+
+    async def _stop_interface_monitor(self):
+        """Close the Docker exec stream and its reader task."""
+
+        task = self._interface_monitor_task
+        self._interface_monitor_task = None
+        if task:
+            task.cancel()
+        writer = self._interface_monitor_writer
+        self._interface_monitor_writer = None
+        if writer:
+            await self._close_interface_monitor_writer(writer)
+        if task:
+            with contextlib.suppress(asyncio.CancelledError):
+                await task
+        self._interface_statuses.clear()
+        self._interface_status_times.clear()
+
+    @staticmethod
+    async def _close_interface_monitor_writer(writer):
+        with contextlib.suppress(Exception):
+            writer.close()
+            await writer.wait_closed()
+
+    async def _read_interface_statuses(self, reader):
+        """Read ``ifname=flags`` records and emit changed adapter states."""
+
+        interfaces = {
+            self._get_container_ifname(adapter_number): adapter_number
+            for adapter_number in range(self.adapters)
+        }
+        try:
+            while True:
+                line = await reader.readline()
+                if not line:
+                    break
+                record = line.decode(errors="replace").strip("\r\n")
+                ifname, separator, flags_text = record.partition("=")
+                adapter_number = interfaces.get(ifname)
+                if not separator or adapter_number is None:
+                    continue
+                try:
+                    is_up = bool(int(flags_text, 0) & 0x1)  # Linux IFF_UP
+                except ValueError:
+                    continue
+                status = "started" if is_up else "stopped"
+                now = asyncio.get_running_loop().time()
+                if (
+                    self._interface_statuses.get(adapter_number) == status
+                    and now - self._interface_status_times.get(adapter_number, 0)
+                    < self._INTERFACE_STATUS_RESYNC_INTERVAL
+                ):
+                    continue
+                self._interface_statuses[adapter_number] = status
+                self._interface_status_times[adapter_number] = now
+                self.project.emit(
+                    "node.interface_status",
+                    {
+                        "project_id": self.project.id,
+                        "node_id": self.id,
+                        "adapter_number": adapter_number,
+                        "port_number": 0,
+                        "status": status,
+                    },
+                )
+        except asyncio.CancelledError:
+            raise
+        except (OSError, RuntimeError) as e:
+            log.debug("Docker interface monitor for '%s' stopped: %s", self.name, e)
+        finally:
+            if self._interface_monitor_task is asyncio.current_task():
+                self._interface_monitor_task = None
+                writer = self._interface_monitor_writer
+                self._interface_monitor_writer = None
+                if writer:
+                    await self._close_interface_monitor_writer(writer)
+
     async def _add_ubridge_connection(self, nio, adapter_number):
         """
         Creates a connection in uBridge.
@@ -1424,7 +1589,7 @@ class DockerVM(BaseNode):
         await self._ubridge_send(f"bridge create {bridge_name}")
         self._bridges.add(bridge_name)
         await self._ubridge_send(
-            "bridge add_nio_tap bridge{adapter_number} {hostif}".format(
+            "bridge add_nio_tap bridge{adapter_number} {hostif} off".format(
                 adapter_number=adapter_number, hostif=adapter.host_ifc
             )
         )
@@ -1454,12 +1619,19 @@ class DockerVM(BaseNode):
 
         if nio:
             await self._connect_nio(adapter_number, nio)
+            await self._set_adapter_carrier(adapter_number, not nio.suspend)
 
     async def _get_namespace(self):
 
         result = await self.manager.query("GET", f"containers/{self._cid}/json")
         return int(result["State"]["Pid"])
 
+    async def _set_adapter_carrier(self, adapter_number, connected):
+        """Replicate a Docker adapter's connection state on its TAP device."""
+
+        state = "on" if connected else "off"
+        await self._ubridge_send(f"bridge set_nio_tap_carrier bridge{adapter_number} {state}")
+
     async def _connect_nio(self, adapter_number, nio):
 
         bridge_name = f"bridge{adapter_number}"
@@ -1497,6 +1669,7 @@ class DockerVM(BaseNode):
 
         if self.status == "started" and self.ubridge:
             await self._connect_nio(adapter_number, nio)
+            await self._set_adapter_carrier(adapter_number, not nio.suspend)
 
         adapter.add_nio(0, nio)
         log.debug(
@@ -1518,6 +1691,9 @@ class DockerVM(BaseNode):
             if bridge_name in self._bridges:
                 await self._ubridge_apply_filters(bridge_name, nio.filters)
                 await self._ubridge_apply_markers(bridge_name, nio)
+                if self.status == "started":
+                    await self._set_adapter_carrier(adapter_number, not nio.suspend)
+
     async def adapter_remove_nio_binding(self, adapter_number):
         """
         Removes an adapter NIO binding.
@@ -1540,6 +1716,8 @@ class DockerVM(BaseNode):
         if self.ubridge:
             nio = adapter.get_nio(0)
             bridge_name = f"bridge{adapter_number}"
+            if self.status == "started":
+                await self._set_adapter_carrier(adapter_number, False)
             await self._ubridge_send(f"bridge stop {bridge_name}")
             await self._ubridge_send(
                 "bridge remove_nio_udp bridge{adapter} {lport} {rhost} {rport}".format(

gns3server/compute/ubridge/hypervisor.py

@@ -160,10 +160,10 @@ class Hypervisor(UBridgeHypervisor):
             match = re.search(r"ubridge version ([0-9a-z\.]+)", output)
             if match:
                 self._version = match.group(1)
-                # uBridge >= 1.2.0 is required for features this server now
+                # uBridge >= 1.2.3 is required for the AF_UNIX control
-                # relies on: the AF_UNIX control channel (-U), the marker
+                # channel, marker filters, builtin Ethernet Switch support,
-                # (mark) filter, and the brctl-backed builtin Ethernet Switch.
+                # and Docker TAP carrier control.
-                minimum_required_version = "1.2.0"
+                minimum_required_version = "1.2.3"
                 if parse_version(self._version) < parse_version(minimum_required_version):
                     raise UbridgeError(f"uBridge executable version must be >= {minimum_required_version}")
             else:

tests/api/routes/compute/test_docker_nodes.py

@@ -247,7 +247,8 @@ class TestDockerNodesRoutes:
             "lport": 4242,
             "rport": 4343,
             "rhost": "127.0.0.1",
-            "filters": {"packet_loss": 10}
+            "filters": {"packet_loss": 10},
+            "suspend": False
         }
 
         url = app.url_path_for("compute:create_docker_node_nio",
@@ -259,6 +260,7 @@ class TestDockerNodesRoutes:
         assert response.status_code == status.HTTP_201_CREATED
         assert response.json()["filters"] == {"packet_loss": 10}
         params["filters"] = {}
+        params["suspend"] = True
 
         url = app.url_path_for("compute:update_docker_node_nio",
                                project_id=vm["project_id"],
@@ -270,6 +272,7 @@ class TestDockerNodesRoutes:
         assert response.status_code == status.HTTP_201_CREATED
         assert response.json()["type"] == "nio_udp"
         assert response.json()["filters"] == {}
+        assert response.json()["suspend"] is True
 
     async def test_docker_delete_nio(self, app: FastAPI, compute_client: AsyncClient, vm: dict) -> None:
 

tests/compute/docker/test_docker_vm.py

@@ -31,7 +31,7 @@ from gns3server.compute.docker.docker_error import DockerError, DockerHttp404Err
 from gns3server.compute.docker import Docker
 
 
-from unittest.mock import patch, MagicMock, call
+from unittest.mock import AsyncMock, patch, MagicMock, call
 
 
 @pytest_asyncio.fixture
@@ -48,6 +48,10 @@ async def vm(compute_project, manager):
     vm = DockerVM("test", str(uuid.uuid4()), compute_project, manager, "ubuntu:latest", aux_type="none")
     vm._cid = "e90e34656842"
     vm.mac_address = '02:42:3d:b7:93:00'
+    # Interface monitoring has its own focused tests below. Keep unrelated
+    # lifecycle tests isolated from a real Docker exec stream.
+    vm._start_interface_monitor = AsyncioMagicMock()
+    vm._stop_interface_monitor = AsyncioMagicMock()
     return vm
 
 
@@ -1198,6 +1202,7 @@ async def test_start(vm, manager, free_console_port, tmpdir):
     assert vm._start_ubridge.called
     assert vm._start_console.called
     assert vm._start_aux.called
+    assert vm._start_interface_monitor.called
     assert vm.status == "started"
 
 
@@ -1289,12 +1294,137 @@ async def test_start_unpause(vm):
     assert vm.status == "started"
 
 
+@pytest.mark.asyncio
+async def test_start_already_running_starts_interface_monitor(vm):
+
+    with patch("gns3server.compute.docker.Docker.install_busybox"):
+        with asyncio_patch("gns3server.compute.docker.DockerVM._get_container_state", return_value="running"):
+            await vm.start()
+
+    assert vm.status == "started"
+    vm._start_interface_monitor.assert_called_once()
+
+
 @pytest.mark.asyncio
 async def test_restart(vm):
 
     with asyncio_patch("gns3server.compute.docker.Docker.query") as mock:
         await vm.restart()
     mock.assert_called_with("POST", "containers/e90e34656842/restart")
+    vm._stop_interface_monitor.assert_called_once()
+    vm._start_interface_monitor.assert_called_once()
+
+
+@pytest.mark.asyncio
+async def test_read_interface_statuses(vm):
+
+    reader = MagicMock()
+    reader.readline = AsyncMock(side_effect=[
+        b"eth0=0x1003\r\n",
+        b"eth0=0x1003\r\n",  # duplicate must not emit again
+        b"eth0=0x1002\r\n",
+        b"unknown=0x1003\r\n",
+        b"eth0=invalid\r\n",
+        b"",
+    ])
+    vm.project.emit = MagicMock()
+
+    await DockerVM._read_interface_statuses(vm, reader)
+
+    assert vm.project.emit.call_args_list == [
+        call("node.interface_status", {
+            "project_id": vm.project.id,
+            "node_id": vm.id,
+            "adapter_number": 0,
+            "port_number": 0,
+            "status": "started",
+        }),
+        call("node.interface_status", {
+            "project_id": vm.project.id,
+            "node_id": vm.id,
+            "adapter_number": 0,
+            "port_number": 0,
+            "status": "stopped",
+        }),
+    ]
+
+
+@pytest.mark.asyncio
+async def test_read_interface_statuses_periodically_resynchronizes(vm):
+
+    reader = MagicMock()
+    reader.readline = AsyncMock(side_effect=[b"eth0=0x1003\n", b"eth0=0x1003\n", b""])
+    vm._INTERFACE_STATUS_RESYNC_INTERVAL = 0
+    vm.project.emit = MagicMock()
+
+    await DockerVM._read_interface_statuses(vm, reader)
+
+    assert vm.project.emit.call_count == 2
+
+
+@pytest.mark.asyncio
+async def test_start_interface_monitor(vm, manager):
+
+    reader = MagicMock()
+    reader.readuntil = AsyncMock(return_value=b"HTTP/1.1 101 UPGRADED\r\n\r\n")
+    reader.readline = AsyncMock(return_value=b"")
+    writer = MagicMock()
+    writer.drain = AsyncMock()
+    writer.wait_closed = AsyncMock()
+    manager._api_version = "1.24"
+
+    with asyncio_patch("gns3server.compute.docker.Docker.query", return_value={"Id": "monitor-exec"}) as query:
+        with asyncio_patch("asyncio.open_unix_connection", return_value=(reader, writer)):
+            await DockerVM._start_interface_monitor(vm)
+            await asyncio.sleep(0)
+
+    request = query.call_args
+    assert request.args[:2] == ("POST", "containers/e90e34656842/exec")
+    assert request.kwargs["data"]["Cmd"][-1] == "eth0"
+    assert vm._interface_monitor_writer is None
+    writer.close.assert_called_once()
+
+
+@pytest.mark.asyncio
+async def test_start_interface_monitor_is_idempotent(vm):
+
+    vm._interface_monitor_task = MagicMock()
+    vm._interface_monitor_task.done.return_value = False
+
+    with asyncio_patch("gns3server.compute.docker.Docker.query") as query:
+        await DockerVM._start_interface_monitor(vm)
+
+    query.assert_not_called()
+    vm._stop_interface_monitor.assert_not_called()
+
+
+@pytest.mark.asyncio
+async def test_start_interface_monitor_failure_does_not_fail_node(vm, manager):
+
+    reader = MagicMock()
+    reader.readuntil = AsyncMock(return_value=b"HTTP/1.1 500 Internal Server Error\r\n\r\n")
+    writer = MagicMock()
+    writer.drain = AsyncMock()
+    writer.wait_closed = AsyncMock()
+    manager._api_version = "1.24"
+
+    with asyncio_patch("gns3server.compute.docker.Docker.query", return_value={"Id": "monitor-exec"}):
+        with asyncio_patch("asyncio.open_unix_connection", return_value=(reader, writer)):
+            await DockerVM._start_interface_monitor(vm)
+
+    assert vm._interface_monitor_task is None
+    writer.close.assert_called_once()
+
+
+@pytest.mark.asyncio
+async def test_start_interface_monitor_rejects_malformed_exec_response(vm):
+
+    with asyncio_patch("gns3server.compute.docker.Docker.query", return_value=None):
+        with asyncio_patch("asyncio.open_unix_connection") as open_connection:
+            await DockerVM._start_interface_monitor(vm)
+
+    open_connection.assert_not_called()
+    assert vm._interface_monitor_task is None
 
 
 @pytest.mark.asyncio
@@ -1313,6 +1443,7 @@ async def test_stop(vm):
     assert mock.stop.called
     assert vm._ubridge_hypervisor is None
     assert vm._fix_permissions.called
+    assert vm._stop_interface_monitor.called
 
 
 @pytest.mark.asyncio
@@ -1538,11 +1669,12 @@ async def test_add_ubridge_connection(vm):
 
     calls = [
         call.send('bridge create bridge0'),
-        call.send("bridge add_nio_tap bridge0 tap-gns3-e0"),
+        call.send("bridge add_nio_tap bridge0 tap-gns3-e0 off"),
         call.send('docker move_to_ns tap-gns3-e0 42 eth0'),
         call.send('bridge add_nio_udp bridge0 4242 127.0.0.1 4343'),
         call.send('bridge start_capture bridge0 "/tmp/capture.pcap"'),
         call.send('bridge start bridge0'),
+        call.send('bridge set_nio_tap_carrier bridge0 on')
     ]
     assert 'bridge0' in vm._bridges
     # We need to check any_order otherwise mock is confused by asyncio
@@ -1591,7 +1723,7 @@ async def test_add_ubridge_connection_none_nio(vm):
 
     calls = [
         call.send('bridge create bridge0'),
-        call.send("bridge add_nio_tap bridge0 tap-gns3-e0"),
+        call.send("bridge add_nio_tap bridge0 tap-gns3-e0 off"),
         call.send('docker move_to_ns tap-gns3-e0 42 eth0'),
 
     ]
@@ -1600,6 +1732,20 @@ async def test_add_ubridge_connection_none_nio(vm):
     vm._ubridge_hypervisor.assert_has_calls(calls, any_order=True)
 
 
+@pytest.mark.asyncio
+async def test_set_adapter_carrier(vm):
+
+    vm._ubridge_send = AsyncioMagicMock()
+
+    await vm._set_adapter_carrier(2, True)
+    await vm._set_adapter_carrier(2, False)
+
+    vm._ubridge_send.assert_has_calls([
+        call("bridge set_nio_tap_carrier bridge2 on"),
+        call("bridge set_nio_tap_carrier bridge2 off"),
+    ])
+
+
 @pytest.mark.asyncio
 async def test_add_ubridge_connection_invalid_adapter_number(vm):
 
@@ -1641,6 +1787,22 @@ async def test_adapter_add_nio_binding_1(vm):
     assert vm._ethernet_adapters[0].get_nio(0) == nio
 
 
+@pytest.mark.asyncio
+async def test_adapter_add_nio_binding_sets_carrier(vm):
+
+    nio = vm.manager.create_nio({
+        "type": "nio_udp", "lport": 4242, "rport": 4343, "rhost": "127.0.0.1"
+    })
+    vm.status = "started"
+    vm._ubridge_hypervisor = MagicMock()
+    vm._connect_nio = AsyncioMagicMock()
+    vm._set_adapter_carrier = AsyncioMagicMock()
+
+    await vm.adapter_add_nio_binding(0, nio)
+
+    vm._set_adapter_carrier.assert_called_once_with(0, True)
+
+
 @pytest.mark.asyncio
 async def test_adapter_udpate_nio_binding_bridge_not_started(vm):
 
@@ -1656,6 +1818,24 @@ async def test_adapter_udpate_nio_binding_bridge_not_started(vm):
     assert vm._ubridge_apply_filters.called is False
 
 
+@pytest.mark.asyncio
+async def test_adapter_update_nio_binding_sets_suspended_carrier(vm):
+
+    nio = vm.manager.create_nio({
+        "type": "nio_udp", "lport": 4242, "rport": 4343, "rhost": "127.0.0.1"
+    })
+    nio.suspend = True
+    vm.status = "started"
+    vm._ubridge_hypervisor = MagicMock()
+    vm._bridges.add("bridge0")
+    vm._ubridge_apply_filters = AsyncioMagicMock()
+    vm._set_adapter_carrier = AsyncioMagicMock()
+
+    await vm.adapter_update_nio_binding(0, nio)
+
+    vm._set_adapter_carrier.assert_called_once_with(0, False)
+
+
 @pytest.mark.asyncio
 async def test_adapter_add_nio_binding_invalid_adapter(vm):
 
@@ -1680,12 +1860,14 @@ async def test_adapter_remove_nio_binding(vm):
            "rhost": "127.0.0.1"}
     nio = vm.manager.create_nio(nio)
     await vm.adapter_add_nio_binding(0, nio)
+    vm.status = "started"
 
     with asyncio_patch("gns3server.compute.docker.DockerVM._ubridge_send") as delete_ubridge_mock:
         await vm.adapter_remove_nio_binding(0)
         assert vm._ethernet_adapters[0].get_nio(0) is None
         delete_ubridge_mock.assert_any_call('bridge stop bridge0')
         delete_ubridge_mock.assert_any_call('bridge remove_nio_udp bridge0 4242 127.0.0.1 4343')
+        delete_ubridge_mock.assert_any_call('bridge set_nio_tap_carrier bridge0 off')
 
 
 @pytest.mark.asyncio

tests/compute/docker/test_vendor_docker_vm.py

@@ -80,6 +80,10 @@ def _make_vm(compute_project, manager, environment=None, console_type="docker_ex
         extra_volumes=extra_volumes or [], adapters=adapters,
     )
     vm._cid = "e90e34656842"
+    # Interface monitoring belongs to DockerVM and is covered by its focused
+    # tests. Keep vendor-console tests independent from a Docker exec stream.
+    vm._start_interface_monitor = AsyncioMagicMock()
+    vm._stop_interface_monitor = AsyncioMagicMock()
     return vm
 
 

tests/compute/ubridge/test_hypervisor.py

@@ -159,6 +159,37 @@ async def test_stop_tcp_has_no_socket_to_unlink(tmp_path, monkeypatch):
     await hyp.stop()
 
 
+# ---------------------------------------------------------------------------
+# version requirement
+# ---------------------------------------------------------------------------
+
+@pytest.mark.asyncio
+async def test_requires_ubridge_1_2_3(tmp_path, monkeypatch):
+
+    hyp = _make("unix", tmp_path, monkeypatch)
+    with patch(
+        "gns3server.compute.ubridge.hypervisor.subprocess_check_output",
+        new_callable=AsyncMock,
+        return_value="ubridge version 1.2.2",
+    ):
+        with pytest.raises(UbridgeError, match=r">= 1\.2\.3"):
+            await hyp._check_ubridge_version()
+
+
+@pytest.mark.asyncio
+async def test_accepts_ubridge_1_2_3(tmp_path, monkeypatch):
+
+    hyp = _make("unix", tmp_path, monkeypatch)
+    with patch(
+        "gns3server.compute.ubridge.hypervisor.subprocess_check_output",
+        new_callable=AsyncMock,
+        return_value="ubridge version 1.2.3",
+    ):
+        await hyp._check_ubridge_version()
+
+    assert hyp.version == "1.2.3"
+
+
 # ---------------------------------------------------------------------------
 # start: fail-fast on an immediately-exiting uBridge
 # ---------------------------------------------------------------------------