[network-manager-openvpn: 4/6] helper: gracefully handle missing environment variables in --up-restart invocations

[Thomas Haller <thaller src gnome org>]

commit 39e9437fa6f1e3271776aae632f5b3a34d0ac5f9
Author: Thomas Haller <thaller redhat com>
Date:   Tue Mar 18 15:42:13 2014 +0100

    helper: gracefully handle missing environment variables in --up-restart invocations
    
    When calling the script during restart, some environment variables are
    not set properly. Work around this by taking the values from the
    command line arguments instead.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=556134
    https://bugs.launchpad.net/ubuntu/+source/network-manager-openvpn/+bug/280160/
    https://bugzilla.redhat.com/show_bug.cgi?id=766340
    https://bugzilla.redhat.com/show_bug.cgi?id=1083317
    
    Signed-off-by: Thomas Haller <thaller redhat com>

 src/nm-openvpn-service-openvpn-helper.c |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)
---
diff --git a/src/nm-openvpn-service-openvpn-helper.c b/src/nm-openvpn-service-openvpn-helper.c
index edf44e7..2c07cff 100644
--- a/src/nm-openvpn-service-openvpn-helper.c
+++ b/src/nm-openvpn-service-openvpn-helper.c
@@ -538,6 +538,7 @@ main (int argc, char *argv[])
        int tapdev = -1;
        char **iter;
        int shift = 0;
+       gboolean is_restart;
 
 #if !GLIB_CHECK_VERSION (2, 35, 0)
        g_type_init ();
@@ -587,6 +588,8 @@ main (int argc, char *argv[])
        argv += shift;
        argc -= shift;
 
+       is_restart = argc >= 7 && !g_strcmp0 (argv[6], "restart");
+
        connection = dbus_g_bus_get (DBUS_BUS_SYSTEM, &err);
        if (!connection) {
                g_warning ("Could not get the system bus: %s", err->message);
@@ -628,6 +631,8 @@ main (int argc, char *argv[])
 
        /* IPv4 address */
        tmp = getenv ("ifconfig_local");
+       if (!tmp && is_restart)
+               tmp = argv[4];
        if (tmp && strlen (tmp)) {
                val = addr4_to_gvalue (tmp);
                if (val)
@@ -637,13 +642,15 @@ main (int argc, char *argv[])
        }
 
        /* PTP address; for vpnc PTP address == internal IP4 address */
-       val = addr4_to_gvalue (getenv ("ifconfig_remote"));
+       tmp = getenv ("ifconfig_remote");
+       if (!tmp && is_restart)
+               tmp = argv[5];
+       val = addr4_to_gvalue (tmp);
        if (val) {
                /* Sigh.  Openvpn added 'topology' stuff in 2.1 that changes the meaning
                 * of the ifconfig bits without actually telling you what they are
                 * supposed to mean; basically relying on specific 'ifconfig' behavior.
                 */
-               tmp = getenv ("ifconfig_remote");
                if (tmp && !strncmp (tmp, "255.", 4)) {
                        guint32 addr;