From 53056ee3f1e1ad07495880ac9f02ed5755ff258f Mon Sep 17 00:00:00 2001
From: Kali Kaneko <kali@leap.se>
Date: Sat, 27 Jul 2013 01:05:16 +0900
Subject: add kext check

---
 changes/feature_2906_check_kext       |  1 +
 src/leap/gui/mainwindow.py            | 16 ++++++++++++----
 src/leap/services/eip/vpnlaunchers.py | 14 ++++++++++++++
 3 files changed, 27 insertions(+), 4 deletions(-)
 create mode 100644 changes/feature_2906_check_kext

diff --git a/changes/feature_2906_check_kext b/changes/feature_2906_check_kext
new file mode 100644
index 00000000..3b663d55
--- /dev/null
+++ b/changes/feature_2906_check_kext
@@ -0,0 +1 @@
+  o Add check for tuntap kext before launching openvpn. Closes: #2906
diff --git a/src/leap/gui/mainwindow.py b/src/leap/gui/mainwindow.py
index 1d0d3120..f333d7ec 100644
--- a/src/leap/gui/mainwindow.py
+++ b/src/leap/gui/mainwindow.py
@@ -52,10 +52,12 @@ from leap.services.eip.vpnprocess import VPN
 from leap.services.eip.vpnprocess import OpenVPNAlreadyRunning
 from leap.services.eip.vpnprocess import AlienOpenVPNAlreadyRunning
 
-from leap.services.eip.vpnlaunchers import (VPNLauncherException,
-                                            OpenVPNNotFoundException,
-                                            EIPNoPkexecAvailable,
-                                            EIPNoPolkitAuthAgentAvailable)
+from leap.services.eip.vpnlaunchers import VPNLauncherException
+from leap.services.eip.vpnlaunchers import OpenVPNNotFoundException
+from leap.services.eip.vpnlaunchers import EIPNoPkexecAvailable
+from leap.services.eip.vpnlaunchers import EIPNoPolkitAuthAgentAvailable
+from leap.services.eip.vpnlaunchers import EIPNoTunKextLoaded
+
 from leap.util import __version__ as VERSION
 from leap.util.keyring_helpers import has_keyring
 
@@ -1037,6 +1039,12 @@ class MainWindow(QtGui.QMainWindow):
                         "running and try again."),
                 error=True)
             self._set_eipstatus_off()
+        except EIPNoTunKextLoaded:
+            self._status_panel.set_global_status(
+                self.tr("Encrypted Internet cannot be started because "
+                        "the tuntap extension is not installed properly "
+                        "in your system."))
+            self._set_eipstatus_off()
         except EIPNoPkexecAvailable:
             self._status_panel.set_global_status(
                 self.tr("We could not find <b>pkexec</b> "
diff --git a/src/leap/services/eip/vpnlaunchers.py b/src/leap/services/eip/vpnlaunchers.py
index 81d9b43b..8522d1df 100644
--- a/src/leap/services/eip/vpnlaunchers.py
+++ b/src/leap/services/eip/vpnlaunchers.py
@@ -58,6 +58,10 @@ class EIPNoPkexecAvailable(VPNLauncherException):
     pass
 
 
+class EIPNoTunKextLoaded(VPNLauncherException):
+    pass
+
+
 class VPNLauncher:
     """
     Abstract launcher class
@@ -520,6 +524,13 @@ class DarwinVPNLauncher(VPNLauncher):
             to, frompath, to, to)
         return cmd
 
+    @classmethod
+    def maybe_kextloaded(kls):
+        """
+        Checks if the needed kext is loaded before launching openvpn.
+        """
+        return bool(commands.getoutput('kextstat | grep "leap.tun"'))
+
     def _get_resource_path(self):
         """
         Returns the absolute path to the app resources directory
@@ -600,6 +611,9 @@ class DarwinVPNLauncher(VPNLauncher):
         leap_assert(socket_host, "We need a socket host!")
         leap_assert(socket_port, "We need a socket port!")
 
+        if not self.maybe_kextloaded():
+            raise EIPNoTunKextLoaded
+
         kwargs = {}
         if ProviderConfig.standalone:
             kwargs['path_extension'] = os.path.join(
-- 
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