[network-manager-iodine] Unbreak MTU parsing

[Guido Günther <guidog src gnome org>]

commit 1f97c01496dee53d6d27095529c781222a3b803d
Author: Guido Günther <agx sigxcpu org>
Date:   Sun Feb 5 01:43:50 2017 +0100

    Unbreak MTU parsing
    
    by using g_variant_new_uint32 instead of addr4_to_gvariant
    
    introduced by a9fad49eceb1928fb7dd5ff63f4b4b384f35c81a

 src/nm-iodine-service.c |   23 +++++++++++++++--------
 1 files changed, 15 insertions(+), 8 deletions(-)
---
diff --git a/src/nm-iodine-service.c b/src/nm-iodine-service.c
index 0164133..705d4fe 100644
--- a/src/nm-iodine-service.c
+++ b/src/nm-iodine-service.c
@@ -250,6 +250,7 @@ iodine_parse_stderr_line (NMVpnServicePlugin *plugin,
        NMIodinePluginPrivate *priv = NM_IODINE_PLUGIN_GET_PRIVATE (plugin);
        gchar **split = NULL;
        GVariant *val;
+       long int mtu;
        gint len;
        gint ret = 1;
 
@@ -321,15 +322,21 @@ iodine_parse_stderr_line (NMVpnServicePlugin *plugin,
                        return -1;
                }
        } else if (g_str_has_prefix(line, "Setting MTU of ")) {
-               g_message("MTU: %s", split[len-1]);
-               val = addr4_to_gvariant (split[len-1]);
-               if (val) {
-                       g_variant_builder_add (&priv->ip4config, "{sv}",
-                                              NM_VPN_PLUGIN_IP4_CONFIG_MTU,
-                                              val);
+               errno = 0;
+               mtu = strtol (split[len-1], NULL, 10);
+               if (errno || mtu < 0 || mtu > 20000) {
+                       g_warning("Ignoring invalid tunnel MTU '%s'", split[len-1]);
                } else {
-                       g_warning("Could not set MTU");
-                       return -1;
+                       g_message("MTU: %s", split[len-1]);
+                       val = g_variant_new_uint32 ((guint32) mtu);
+                       if (val) {
+                               g_variant_builder_add (&priv->ip4config, "{sv}",
+                                                                          NM_VPN_PLUGIN_IP4_CONFIG_MTU,
+                                                                          val);
+                       } else {
+                               g_warning("Could not set MTU");
+                               return -1;
+                       }
                }
        } else if (g_str_has_prefix(line, "Opened dns")) {
                g_message("Interface: %s", split[len-1]);