Add warning when user tries to run vncviewer on IPv6 host

gns3/graphics_view.py

@@ -979,6 +979,11 @@ class GraphicsView(QtWidgets.QGraphicsView):
             # returns True to ignore this node.
             return True
 
+        # TightVNC has lack support of IPv6 host at this moment
+        if "vncviewer" in node.consoleCommand() and ":" in node.consoleHost():
+            QtWidgets.QMessageBox.warning(
+                self, "TightVNC", "TightVNC (vncviewer) may not start because of lack of IPv6 support.")
+
         try:
             node.openConsole(aux=aux)
         except (OSError, ValueError) as e:

tests/test_graphics_view.py

@@ -0,0 +1,34 @@
+#!/usr/bin/env python
+#
+# Copyright (C) 2017 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/>.
+
+from unittest.mock import MagicMock, patch
+from gns3.graphics_view import GraphicsView
+from gns3.node import Node
+
+
+def test_console_to_node_vncviewer_and_ipv6():
+    node = MagicMock(
+        initialized=MagicMock(return_value=True),
+        status=MagicMock(return_value=Node.started),
+        consoleCommand=MagicMock(return_value="vncviewer"),
+        consoleHost=MagicMock(return_value="::1")
+    )
+    view = GraphicsView.__new__(GraphicsView)
+    with patch('gns3.qt.QtWidgets.QMessageBox.warning') as warning_mock:
+        view.consoleToNode(node)
+        assert warning_mock.called
+        assert warning_mock.call_args[0][1] == 'TightVNC'