Return flag for special interface that you can use in the cloud

Fix https://github.com/GNS3/gns3-gui/issues/1509

gns3server/compute/builtin/nodes/cloud.py

@@ -55,7 +55,8 @@ class Cloud(BaseNode):
         network_interfaces = interfaces()
         for interface in network_interfaces:
             host_interfaces.append({"name": interface["name"],
-                                    "type": interface["type"]})
+                                    "type": interface["type"],
+                                    "special": interface["special"]})
 
         return {"name": self.name,
                 "node_id": self.id,

gns3server/schemas/cloud.py

@@ -26,10 +26,15 @@ HOST_INTERFACE_SCHEMA = {
             "minLength": 1,
         },
         "type": {
+            "description": "Interface type",
             "enum": ["ethernet", "tap"]
         },
+        "special": {
+            "description": "If true the interface is non standard (firewire for example)",
+            "type": "boolean"
+        }
     },
-    "required": ["name", "type"],
+    "required": ["name", "type", "special"],
     "additionalProperties": False
 }
 

gns3server/utils/interfaces.py

@@ -205,4 +205,11 @@ def interfaces():
         if service_installed is False:
             raise aiohttp.web.HTTPInternalServerError(text="The Winpcap or Npcap is not installed or running")
 
+    # This interface have special behavior
+    for result in results:
+        result["special"] = False
+        for special_interface in ("lo", "vmnet", "vboxnet", "docker", "lxcbr", "virbr", "ovs-system", "veth", "fw", "p2p"):
+            if result["name"].lower().startswith(special_interface):
+                result["special"] = True
+
     return results

tests/utils/test_interfaces.py

@@ -22,7 +22,11 @@ from gns3server.utils.interfaces import interfaces, is_interface_up
 
 def test_interfaces():
     # This test should pass on all platforms without crash
-    assert isinstance(interfaces(), list)
+    interface_list = interfaces()
+    assert isinstance(interface_list, list)
+    for interface in interface_list:
+        if interface["name"].startswith("vmnet"):
+            assert interface["special"]
 
 
 def test_is_interface_up():