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PfCreateInterface (iphlpapi)
.
C# Signature:
[DllImport("Iphlpapi.dll", EntryPoint = "PfCreateInterface")]
static extern Int32 PfCreateInterface(int dwName, uint inAction, uint outAction, int bUseLog, int bMustBeUnique, ref IntPtr ppInterface);
VB Signature:
Declare Function PfCreateInterface Lib "iphlpapi.dll" (TODO) As TODO
User-Defined Types:
None.
Alternative Managed API:
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Notes:
Tips & Tricks:
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Sample Code:
using System;
using System.Collections.Generic;
using System.Net;
using System.Runtime.InteropServices;
using Microsoft.Win32;
/// <summary>
/// IP packet filter management wrapper for Iphlpapi.dll (Win 2000/XP)
/// </summary>
class Program
{
// C conversions for Fltdefs.h
internal const int FALSE = 0;
internal const int TRUE = 1;
[StructLayout(LayoutKind.Sequential, Pack = 1)]
internal unsafe struct PPF_FILTER_DESCRIPTOR
{
public FILTER_FLAGS dwFilterFlags;
public UInt32 dwRule;
public PFADDRESSTYPE pfatType;
public UInt32* SrcAddr;
public UInt32* SrcMask;
public UInt32* DstAddr;
public UInt32* DstMask;
public PROTOCOL dwProtocol;
public UInt32 fLateBound;
public UInt16 wSrcPort;
public UInt16 wDstPort;
public UInt16 wSrcPortHighRange;
public UInt16 wDstPortHighRange;
}
static void Main(string[] args)
{
string[] hostsToBlock = new string[2];
hostsToBlock[0] = "67.77.87.97,255.255.255.255,0"; //blocks all traffic on any port to/from 67.77.87.97
hostsToBlock[1] = "0.0.0.0,0.0.0.0,29000"; //blocks all traffic on port 29000, in and out
StartPacketFilter(hostsToBlock);
System.Windows.Forms.Application.Run();
}
foreach (string localAddress in localIpAddresses)
{
uint result;
IntPtr interfaceHandle = new IntPtr();
//convert the string IP to an unsigned int for p/invoke
UInt32 lLocalIp = lIpFromString(localAddress);
//create a filter interface in the tcp/ip stack
result = IpPacketFilter.PfCreateInterface(0, PFFORWARD_ACTION.PF_ACTION_FORWARD, PFFORWARD_ACTION.PF_ACTION_FORWARD, FALSE, TRUE, ref interfaceHandle);
if (result != 0)
return false;
//bind interface to an ip address
result = IpPacketFilter.PfBindInterfaceToIPAddress(interfaceHandle, PFADDRESSTYPE.PF_IPV4, ref lLocalIp);
if (result != 0)
return false;
foreach (string targetHost in hosts)
{
IntPtr filterHandle = new IntPtr();
string[] hostDetail = targetHost.Split(new string[] { "," }, StringSplitOptions.None);
if (hostDetail != null && hostDetail.Length == 3)
{
//build the filter structure
PPF_FILTER_DESCRIPTOR filter = new PPF_FILTER_DESCRIPTOR();
filter.dwFilterFlags = FILTER_FLAGS.FD_FLAGS;
filter.dwRule = FALSE;
filter.pfatType = PFADDRESSTYPE.PF_IPV4;
filter.dwProtocol = PROTOCOL.TCP;
The PfCreateInterface function creates a new filter interface. Use this interface to control the adding and deleting of filters to and from network adapters.
3/23/2010 11:01:43 AM - Rob Kaczor-153.2.246.30
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