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/*
* OpenVPN -- An application to securely tunnel IP networks
* over a single TCP/UDP port, with support for SSL/TLS-based
* session authentication and key exchange,
* packet encryption, packet authentication, and
* packet compression.
*
* Copyright (C) 2016-2021 Selva Nair <selva.nair@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* 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; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifdef _WIN32
#ifndef OPENVPN_BLOCK_DNS_H
#define OPENVPN_BLOCK_DNS_H
/* Any value less than 5 should work fine. 3 is chosen without any real reason. */
#define BLOCK_DNS_IFACE_METRIC 3
typedef void (*block_dns_msg_handler_t) (DWORD err, const char *msg);
DWORD
delete_block_dns_filters(HANDLE engine);
DWORD
add_block_dns_filters(HANDLE *engine, int iface_index, const WCHAR *exe_path,
block_dns_msg_handler_t msg_handler_callback);
/**
* Return interface metric value for the specified interface index.
*
* @param index The index of TAP adapter.
* @param family Address family (AF_INET for IPv4 and AF_INET6 for IPv6).
* @param is_auto On return set to true if automatic metric is in use.
* Unused if NULL.
*
* @return positive interface metric on success or -1 on error
*/
int
get_interface_metric(const NET_IFINDEX index, const ADDRESS_FAMILY family, int *is_auto);
/**
* Sets interface metric value for specified interface index.
*
* @param index The index of TAP adapter
* @param family Address family (AF_INET for IPv4 and AF_INET6 for IPv6)
* @param metric Metric value. 0 for automatic metric
*
* @return 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);
#endif /* ifndef OPENVPN_BLOCK_DNS_H */
#endif /* ifdef _WIN32 */
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