Nat node for only the GNS3 VM

gns3server/compute/builtin/builtin_node_factory.py

@@ -18,6 +18,7 @@
 
 from ..error import NodeError
 from .nodes.cloud import Cloud
+from .nodes.nat import Nat
 from .nodes.ethernet_hub import EthernetHub
 from .nodes.ethernet_switch import EthernetSwitch
 
@@ -25,6 +26,7 @@ import logging
 log = logging.getLogger(__name__)
 
 BUILTIN_NODES = {'cloud': Cloud,
+                 'nat': Nat,
                  'ethernet_hub': EthernetHub,
                  'ethernet_switch': EthernetSwitch}
 

gns3server/compute/builtin/nodes/nat.py

@@ -0,0 +1,51 @@
+#!/usr/bin/env python
+#
+# Copyright (C) 2016 GNS3 Technologies Inc.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import socket
+from .cloud import Cloud
+from ...error import NodeError
+
+
+class Nat(Cloud):
+    """
+    A portable and preconfigured node allowing topology to get a
+    nat access to the outside
+    """
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+        if socket.gethostname() != "gns3vm":
+            raise NodeError("NAT node is supported only on GNS3 VM")
+
+        self.ports = [
+            {
+                "name": "nat0",
+                "type": "ethernet",
+                "interface": "eth1",
+                "port_number": 1
+            }
+        ]
+
+    def __json__(self):
+        return {
+            "name": self.name,
+            "node_id": self.id,
+            "project_id": self.project.id,
+            "status": "started",
+            "ports": self.ports
+        }