#include "syshead.h"
#include <fwpmu.h>
#include <initguid.h>
#include <fwpmtypes.h>
#include <winsock2.h>
#include <ws2ipdef.h>
#include <iphlpapi.h>
#include "block_dns.h"

Include dependency graph for block_dns.c:

Macros
#define	FWPM_SESSION_FLAG_DYNAMIC 0x00000001

#define	CHECK_ERROR(err, msg) if (err) { msg_handler(err, msg); goto out; }

Functions
	DEFINE_GUID (FWPM_LAYER_ALE_AUTH_CONNECT_V4, 0xc38d57d1, 0x05a7, 0x4c33, 0x90, 0x4f, 0x7f, 0xbc, 0xee, 0xe6, 0x0e, 0x82)

	DEFINE_GUID (FWPM_LAYER_ALE_AUTH_CONNECT_V6, 0x4a72393b, 0x319f, 0x44bc, 0x84, 0xc3, 0xba, 0x54, 0xdc, 0xb3, 0xb6, 0xb4)

	DEFINE_GUID (FWPM_CONDITION_ALE_APP_ID, 0xd78e1e87, 0x8644, 0x4ea5, 0x94, 0x37, 0xd8, 0x09, 0xec, 0xef, 0xc9, 0x71)

	DEFINE_GUID (FWPM_CONDITION_IP_REMOTE_PORT, 0xc35a604d, 0xd22b, 0x4e1a, 0x91, 0xb4, 0x68, 0xf6, 0x74, 0xee, 0x67, 0x4b)

	DEFINE_GUID (FWPM_CONDITION_IP_LOCAL_INTERFACE, 0x4cd62a49, 0x59c3, 0x4969, 0xb7, 0xf3, 0xbd, 0xa5, 0xd3, 0x28, 0x90, 0xa4)

	DEFINE_GUID (OPENVPN_BLOCK_OUTSIDE_DNS_SUBLAYER, 0x2f660d7e, 0x6a37, 0x11e6, 0xa1, 0x81, 0x00, 0x1e, 0x8c, 0x6e, 0x04, 0xa2)

static void	default_msg_handler (DWORD err, const char *msg)

static DWORD	add_sublayer (GUID uuid)

DWORD	add_block_dns_filters (HANDLE engine_handle, int index, const WCHAR exe_path, block_dns_msg_handler_t msg_handler)

DWORD	delete_block_dns_filters (HANDLE engine_handle)

int	get_interface_metric (const NET_IFINDEX index, const ADDRESS_FAMILY family, int *is_auto)
	Return interface metric value for the specified interface index. More...

DWORD	set_interface_metric (const NET_IFINDEX index, const ADDRESS_FAMILY family, const ULONG metric)
	Sets interface metric value for specified interface index. More...

Variables
static WCHAR *	FIREWALL_NAME = L"OpenVPN"

Macro Definition Documentation

◆ CHECK_ERROR

#define CHECK_ERROR	(	err,
		msg
	)	if (err) { msg_handler(err, msg); goto out; }

Definition at line 116 of file block_dns.c.

◆ FWPM_SESSION_FLAG_DYNAMIC

#define FWPM_SESSION_FLAG_DYNAMIC 0x00000001

Definition at line 47 of file block_dns.c.

Function Documentation

◆ add_block_dns_filters()

DWORD add_block_dns_filters	(	HANDLE *	engine_handle,
		int	index,
		const WCHAR *	exe_path,
		block_dns_msg_handler_t	msg_handler
	)

Definition at line 174 of file block_dns.c.

References add_sublayer(), CHECK_ERROR, default_msg_handler(), FIREWALL_NAME, FWPM_SESSION_FLAG_DYNAMIC, and UINT64.

Referenced by AddBlockDNS(), and win_wfp_block_dns().

◆ add_sublayer()

static DWORD add_sublayer ( GUID uuid )

static

Definition at line 123 of file block_dns.c.

References FIREWALL_NAME.

Referenced by add_block_dns_filters().

◆ default_msg_handler()

static void default_msg_handler	(	DWORD	err,
		const char *	msg
	)

inlinestatic

Definition at line 111 of file block_dns.c.

Referenced by add_block_dns_filters().

◆ DEFINE_GUID() [1/6]

DEFINE_GUID	(	FWPM_CONDITION_ALE_APP_ID	,
		0xd78e1e87	,
		0x8644	,
		0x4ea5	,
		0x94	,
		0x37	,
		0xd8	,
		0x09	,
		0xec	,
		0xef	,
		0xc9	,
		0x71
	)

◆ DEFINE_GUID() [2/6]

DEFINE_GUID	(	FWPM_CONDITION_IP_LOCAL_INTERFACE	,
		0x4cd62a49	,
		0x59c3	,
		0x4969	,
		0xb7	,
		0xf3	,
		0xbd	,
		0xa5	,
		0xd3	,
		0x28	,
		0x90	,
		0xa4
	)

◆ DEFINE_GUID() [3/6]

DEFINE_GUID	(	FWPM_CONDITION_IP_REMOTE_PORT	,
		0xc35a604d	,
		0xd22b	,
		0x4e1a	,
		0x91	,
		0xb4	,
		0x68	,
		0xf6	,
		0x74	,
		0xee	,
		0x67	,
		0x4b
	)

◆ DEFINE_GUID() [4/6]

DEFINE_GUID	(	FWPM_LAYER_ALE_AUTH_CONNECT_V4	,
		0xc38d57d1	,
		0x05a7	,
		0x4c33	,
		0x90	,
		0x4f	,
		0x7f	,
		0xbc	,
		0xee	,
		0xe6	,
		0x0e	,
		0x82
	)

◆ DEFINE_GUID() [5/6]

DEFINE_GUID	(	FWPM_LAYER_ALE_AUTH_CONNECT_V6	,
		0x4a72393b	,
		0x319f	,
		0x44bc	,
		0x84	,
		0xc3	,
		0xba	,
		0x54	,
		0xdc	,
		0xb3	,
		0xb6	,
		0xb4
	)

◆ DEFINE_GUID() [6/6]

DEFINE_GUID	(	OPENVPN_BLOCK_OUTSIDE_DNS_SUBLAYER	,
		0x2f660d7e	,
		0x6a37	,
		0x11e6	,
		0xa1	,
		0x81	,
		0x00	,
		0x1e	,
		0x8c	,
		0x6e	,
		0x04	,
		0xa2
	)

◆ delete_block_dns_filters()

DWORD delete_block_dns_filters ( HANDLE engine_handle )

Definition at line 325 of file block_dns.c.

Referenced by AddBlockDNS(), DeleteBlockDNS(), Undo(), and win_wfp_uninit().

◆ get_interface_metric()

int get_interface_metric	(	const NET_IFINDEX	index,
		const ADDRESS_FAMILY	family,
		int *	is_auto
	)

Return interface metric value for the specified interface index.

Parameters

index	The index of TAP adapter.
family	Address family (AF_INET for IPv4 and AF_INET6 for IPv6).
is_auto	On return set to true if automatic metric is in use. Unused if NULL.

Returns: positive interface metric on success or -1 on error

Definition at line 350 of file block_dns.c.

Referenced by adapter_index_of_ip(), AddBlockDNS(), and win_wfp_block_dns().

◆ set_interface_metric()

DWORD set_interface_metric	(	const NET_IFINDEX	index,
		const ADDRESS_FAMILY	family,
		const ULONG	metric
	)

Sets interface metric value for specified interface index.

Parameters

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.

Definition at line 389 of file block_dns.c.

Referenced by AddBlockDNS(), DeleteBlockDNS(), Undo(), win_wfp_block_dns(), and win_wfp_uninit().

Variable Documentation

◆ FIREWALL_NAME

WCHAR* FIREWALL_NAME = L"OpenVPN"