OpenVPN
wfp_block.h
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1/*
2 * OpenVPN -- An application to securely tunnel IP networks
3 * over a single TCP/UDP port, with support for SSL/TLS-based
4 * session authentication and key exchange,
5 * packet encryption, packet authentication, and
6 * packet compression.
7 *
8 * Copyright (C) 2016-2025 Selva Nair <selva.nair@gmail.com>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2
12 * as published by the Free Software Foundation.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, see <https://www.gnu.org/licenses/>.
21 */
22
23#ifdef _WIN32
24
25#ifndef WFP_BLOCK_H
26#define WFP_BLOCK_H
27
28#include <windef.h>
29#include <iphlpapi.h>
30#include <ws2tcpip.h>
31
32/* Any value less than 5 should work fine. 3 is chosen without any real reason. */
33#define WFP_BLOCK_IFACE_METRIC 3
34
35typedef void (*wfp_block_msg_handler_t)(DWORD err, const char *msg);
36
37DWORD
38delete_wfp_block_filters(HANDLE engine);
39
40DWORD
41add_wfp_block_filters(HANDLE *engine, int iface_index, const WCHAR *exe_path,
42 wfp_block_msg_handler_t msg_handler_callback, BOOL dns_only);
43
54int get_interface_metric(const NET_IFINDEX index, const ADDRESS_FAMILY family, int *is_auto);
55
66DWORD
67set_interface_metric(const NET_IFINDEX index, const ADDRESS_FAMILY family, const ULONG metric);
68
69#endif /* ifndef WFP_BLOCK_H */
70#endif /* ifdef _WIN32 */
#define msg(flags,...)
Definition error.h:150
int get_interface_metric(const NET_IFINDEX index, const ADDRESS_FAMILY family, int *is_auto)
Return interface metric value for the specified interface index.
Definition wfp_block.c:369
DWORD add_wfp_block_filters(HANDLE *engine, int iface_index, const WCHAR *exe_path, wfp_block_msg_handler_t msg_handler_callback, BOOL dns_only)
Definition wfp_block.c:153
DWORD set_interface_metric(const NET_IFINDEX index, const ADDRESS_FAMILY family, const ULONG metric)
Sets interface metric value for specified interface index.
Definition wfp_block.c:408
DWORD delete_wfp_block_filters(HANDLE engine)
Definition wfp_block.c:344
void(* wfp_block_msg_handler_t)(DWORD err, const char *msg)
Definition wfp_block.h:35