summaryrefslogtreecommitdiff
path: root/src/openvpn/block_dns.c
diff options
context:
space:
mode:
authorAlberto Gonzalez Iniesta <agi@inittab.org>2017-06-22 13:16:46 +0200
committerAlberto Gonzalez Iniesta <agi@inittab.org>2017-06-22 13:16:46 +0200
commit9683f890944ffb114f5f8214f694e0b339cf5a5a (patch)
treefa391f5f343554b2861b1f8722d0a2a627e1c1fc /src/openvpn/block_dns.c
parent3a2bbdb05ca6a6996e424c9fb225cb0d53804125 (diff)
New upstream version 2.4.3upstream/2.4.3
Diffstat (limited to 'src/openvpn/block_dns.c')
-rw-r--r--src/openvpn/block_dns.c85
1 files changed, 81 insertions, 4 deletions
diff --git a/src/openvpn/block_dns.c b/src/openvpn/block_dns.c
index e31765e..d43cbcf 100644
--- a/src/openvpn/block_dns.c
+++ b/src/openvpn/block_dns.c
@@ -18,10 +18,9 @@
* 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 (see the file COPYING included with this
- * distribution); if not, write to the Free Software Foundation, Inc.,
- * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifdef HAVE_CONFIG_H
@@ -110,6 +109,9 @@ DEFINE_GUID(
static WCHAR *FIREWALL_NAME = L"OpenVPN";
+VOID NETIOAPI_API_
+InitializeIpInterfaceEntry(PMIB_IPINTERFACE_ROW Row);
+
/*
* Default msg handler does nothing
*/
@@ -341,4 +343,79 @@ delete_block_dns_filters(HANDLE engine_handle)
return err;
}
+/*
+ * Returns interface metric value for specified interface index.
+ *
+ * Arguments:
+ * index : The index of TAP adapter.
+ * family : Address family (AF_INET for IPv4 and AF_INET6 for IPv6).
+ * Returns positive metric value or zero for automatic metric on success,
+ * a less then zero error code on failure.
+ */
+
+int
+get_interface_metric(const NET_IFINDEX index, const ADDRESS_FAMILY family)
+{
+ DWORD err = 0;
+ MIB_IPINTERFACE_ROW ipiface;
+ InitializeIpInterfaceEntry(&ipiface);
+ ipiface.Family = family;
+ ipiface.InterfaceIndex = index;
+ err = GetIpInterfaceEntry(&ipiface);
+ if (err == NO_ERROR)
+ {
+ if (ipiface.UseAutomaticMetric)
+ {
+ return 0;
+ }
+ return ipiface.Metric;
+ }
+ return -err;
+}
+
+/*
+ * Sets interface metric value for specified interface index.
+ *
+ * Arguments:
+ * index : The index of TAP adapter.
+ * family : Address family (AF_INET for IPv4 and AF_INET6 for IPv6).
+ * metric : Metric value. 0 for automatic metric.
+ * Returns 0 on success, a non-zero status code of the last failed action on failure.
+ */
+
+DWORD
+set_interface_metric(const NET_IFINDEX index, const ADDRESS_FAMILY family,
+ const ULONG metric)
+{
+ DWORD err = 0;
+ MIB_IPINTERFACE_ROW ipiface;
+ InitializeIpInterfaceEntry(&ipiface);
+ ipiface.Family = family;
+ ipiface.InterfaceIndex = index;
+ err = GetIpInterfaceEntry(&ipiface);
+ if (err == NO_ERROR)
+ {
+ if (family == AF_INET)
+ {
+ /* required for IPv4 as per MSDN */
+ ipiface.SitePrefixLength = 0;
+ }
+ ipiface.Metric = metric;
+ if (metric == 0)
+ {
+ ipiface.UseAutomaticMetric = TRUE;
+ }
+ else
+ {
+ ipiface.UseAutomaticMetric = FALSE;
+ }
+ err = SetIpInterfaceEntry(&ipiface);
+ if (err == NO_ERROR)
+ {
+ return 0;
+ }
+ }
+ return err;
+}
+
#endif /* ifdef _WIN32 */