[network-manager-pptp] service: try to load nf_conntrack_pptp kernel module (rh #1214643)

[Jiří Klimeš <jklimes src gnome org>]

commit 695d4f2f3d1003e18be6f97bbb103e44f75d3c2b
Author: Jiří Klimeš <jklimes redhat com>
Date:   Fri Apr 17 16:54:49 2015 +0200

    service: try to load nf_conntrack_pptp kernel module (rh #1214643)
    
    The module is necessary with newer kernels so that PPTP work correctly.
    
    https://bugzilla.redhat.com/show_bug.cgi?id=1214643
    https://bugzilla.redhat.com/show_bug.cgi?id=1187328

 src/nm-pptp-service.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)
---
diff --git a/src/nm-pptp-service.c b/src/nm-pptp-service.c
index 28f3313..aadec4a 100644
--- a/src/nm-pptp-service.c
+++ b/src/nm-pptp-service.c
@@ -1313,6 +1313,8 @@ main (int argc, char *argv[])
        GMainLoop *main_loop;
        gboolean persist = FALSE;
        GOptionContext *opt_ctx = NULL;
+       char *conntrack_module[] = { "/sbin/modprobe", "nf_conntrack_pptp", NULL };
+       GError *error = NULL;
 
        GOptionEntry options[] = {
                { "persist", 0, 0, G_OPTION_ARG_NONE, &persist, N_("Don't quit when VPN connection 
terminates"), NULL },
@@ -1359,6 +1361,16 @@ main (int argc, char *argv[])
        if (!persist)
                g_signal_connect (plugin, "quit", G_CALLBACK (quit_mainloop), main_loop);
 
+       /* Newer kernels require nf_conntrack_pptp kernel module so that PPTP
+        * worked correctly. Load the module now. Ignore errors, the module
+        * might not exist (older kernels).
+        * https://bugzilla.redhat.com/show_bug.cgi?id=1187328
+        */
+       if (!g_spawn_sync (NULL, conntrack_module, NULL, 0, NULL, NULL, NULL, NULL, NULL, &error)) {
+               g_warning ("modprobing nf_conntrack_pptp failed: %s", error->message);
+               g_error_free (error);
+       }
+
        g_main_loop_run (main_loop);
 
        g_main_loop_unref (main_loop);