Fix crash when you start capture on a non running IOU

gns3server/handlers/api/iou_handler.py

@@ -16,7 +16,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 import os
-
+from aiohttp.web import HTTPConflict
 
 from ...web.route import Route
 from ...modules.port_manager import PortManager
@@ -255,7 +255,8 @@ class IOUHandler:
         status_codes={
             200: "Capture started",
             400: "Invalid request",
-            404: "Instance doesn't exist"
+            404: "Instance doesn't exist",
+            409: "VM not started"
         },
         description="Start a packet capture on a IOU VM instance",
         input=IOU_CAPTURE_SCHEMA)
@@ -266,8 +267,11 @@ class IOUHandler:
         adapter_number = int(request.match_info["adapter_number"])
         port_number = int(request.match_info["port_number"])
         pcap_file_path = os.path.join(vm.project.capture_working_directory(), request.json["capture_file_name"])
+
+        if not vm.is_running():
+            raise HTTPConflict(text="You can't capture the traffic on a non started VM")
         yield from vm.start_capture(adapter_number, port_number, pcap_file_path, request.json["data_link_type"])
-        response.json({"pcap_file_path": pcap_file_path})
+        response.json({"pcap_file_path": str(pcap_file_path)})
 
     @Route.post(
         r"/projects/{project_id}/iou/vms/{vm_id}/adapters/{adapter_number:\d+}/ports/{port_number:\d+}/stop_capture",
@@ -280,13 +284,18 @@ class IOUHandler:
         status_codes={
             204: "Capture stopped",
             400: "Invalid request",
-            404: "Instance doesn't exist"
+            404: "Instance doesn't exist",
+            409: "VM not started"
         },
         description="Stop a packet capture on a IOU VM instance")
     def stop_capture(request, response):
 
         iou_manager = IOU.instance()
         vm = iou_manager.get_vm(request.match_info["vm_id"], project_id=request.match_info["project_id"])
+
+        if not vm.is_running():
+            raise HTTPConflict(text="You can't capture the traffic on a non started VM")
+
         adapter_number = int(request.match_info["adapter_number"])
         port_number = int(request.match_info["port_number"])
         yield from vm.stop_capture(adapter_number, port_number)

tests/handlers/api/test_iou.py

@@ -18,8 +18,9 @@
 import pytest
 import os
 import stat
+
 from tests.utils import asyncio_patch
-from unittest.mock import patch
+from unittest.mock import patch, MagicMock, PropertyMock
 
 
 @pytest.fixture
@@ -207,27 +208,54 @@ def test_iou_delete_nio(server, vm):
     assert response.route == "/projects/{project_id}/iou/vms/{vm_id}/adapters/{adapter_number:\d+}/ports/{port_number:\d+}/nio"
 
 
-def test_iou_start_capture(server, vm, tmpdir):
+def test_iou_start_capture(server, vm, tmpdir, project):
 
-    with asyncio_patch("gns3server.modules.iou.iou_vm.IOUVM.start_capture", return_value=True) as mock:
+    with patch("gns3server.modules.iou.iou_vm.IOUVM.is_running", return_value=True) as mock:
+        with asyncio_patch("gns3server.modules.iou.iou_vm.IOUVM.start_capture") as start_capture:
 
             params = {"capture_file_name": "test.pcap", "data_link_type": "DLT_EN10MB"}
             response = server.post("/projects/{project_id}/iou/vms/{vm_id}/adapters/0/ports/0/start_capture".format(project_id=vm["project_id"], vm_id=vm["vm_id"]), body=params, example=True)
 
-        assert mock.called
             assert response.status == 200
+
+            assert start_capture.called
             assert "test.pcap" in response.json["pcap_file_path"]
 
 
-def test_iou_stop_capture(server, vm):
+def test_iou_start_capture_not_started(server, vm, tmpdir):
 
-    with asyncio_patch("gns3server.modules.iou.iou_vm.IOUVM.stop_capture", return_value=True) as mock:
+    with patch("gns3server.modules.iou.iou_vm.IOUVM.is_running", return_value=False) as mock:
+        with asyncio_patch("gns3server.modules.iou.iou_vm.IOUVM.start_capture") as start_capture:
+
+            params = {"capture_file_name": "test.pcap", "data_link_type": "DLT_EN10MB"}
+            response = server.post("/projects/{project_id}/iou/vms/{vm_id}/adapters/0/ports/0/start_capture".format(project_id=vm["project_id"], vm_id=vm["vm_id"]), body=params)
+
+            assert not start_capture.called
+            assert response.status == 409
+
+
+def test_iou_stop_capture(server, vm, tmpdir, project):
+
+    with patch("gns3server.modules.iou.iou_vm.IOUVM.is_running", return_value=True) as mock:
+        with asyncio_patch("gns3server.modules.iou.iou_vm.IOUVM.stop_capture") as stop_capture:
 
             response = server.post("/projects/{project_id}/iou/vms/{vm_id}/adapters/0/ports/0/stop_capture".format(project_id=vm["project_id"], vm_id=vm["vm_id"]), example=True)
 
-        assert mock.called
             assert response.status == 204
 
+            assert stop_capture.called
+
+
+def test_iou_stop_capture_not_started(server, vm, tmpdir):
+
+    with patch("gns3server.modules.iou.iou_vm.IOUVM.is_running", return_value=False) as mock:
+        with asyncio_patch("gns3server.modules.iou.iou_vm.IOUVM.stop_capture") as stop_capture:
+
+            response = server.post("/projects/{project_id}/iou/vms/{vm_id}/adapters/0/ports/0/stop_capture".format(project_id=vm["project_id"], vm_id=vm["vm_id"]))
+
+            assert not stop_capture.called
+            assert response.status == 409
+
 
 def test_get_initial_config_without_config_file(server, vm):