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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.
Notes:
/// <summary>
/// The PfCreateInterface function creates a new filter interface. Use this interface to control the adding and deleting of filters to and from adapters.
/// </summary>
/// <param name="dwName">[in] Specifies the interface name. A zero value specifies a new, unique interface. Any other value is a potentially shared interface.
/// The bMustBeUnique parameter can turn a shared interface into a unique one. However, using bMustBeUnique in this way can cause the function to fail.</param>
/// <param name="inAction">[in] Specifies a default action for an input packet. This member can be one of the following values.</param>
/// <param name="outAction">[in] Specifies a default action for an output packet. This member can be one of the following values.</param>
/// <param name="bUseLog">[in] Specifies whether to bind the log to this interface. If this member is TRUE, the log is bound to this interface.</param>
/// <param name="bMustBeUnique">[in] Specifies whether the interface is unique or shared. If this member is TRUE, this interface is unique, that is, it cannot be shared.</param>
/// <param name="ppInterface">[out] Pointer to a pointer that, on successful return, points to an interface handle to use with subsequent function calls.</param>
/// <returns>If the function succeeds, the return value is NO_ERROR.</returns>
Alternative Managed API:
Do you know one? Please contribute it!
Sample Code:
Notes:
using System;
using System.Collections.Generic;
using System.Net;
using System.Runtime.InteropServices;
using Microsoft.Win32;
Tips & Tricks:
Please add some!
/// <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;
internal enum PFADDRESSTYPE : uint
{
PF_IPV4,
PF_IPV6
}
using System;
using System.Collections.Generic;
using System.Net;
using System.Runtime.InteropServices;
using Microsoft.Win32;
internal enum PROTOCOL : uint
/// <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
internal enum PROTOCOL : uint
{
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;
ANY = 0x00,
ICMP = 0x01,
TCP = 0x06,
UDP = 0x11
}
static void Main(string[] args)
internal enum FILTER_FLAGS : uint
{
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();
FD_FLAGS = 0x1
}
if (octets.Length != 4)
return 0;
public UInt32* SrcAddr;
public UInt32* SrcMask;
public UInt32* DstAddr;
public UInt32* DstMask;
for (int i = 0; i < 4; i++)
lIp |= (UInt32.Parse(octets[i]) << (i * 8));
}
catch { }
return lIp;
public PROTOCOL dwProtocol;
public UInt32 fLateBound;
public UInt16 wSrcPort;
public UInt16 wDstPort;
public UInt16 wSrcPortHighRange;
public UInt16 wDstPortHighRange;
}
internal static string[] GetLocalIpAddresses()
static void Main(string[] args)
{
IPHostEntry host = Dns.GetHostEntry(Dns.GetHostName());
string[] localIpAddresses = new string[host.AddressList.Length];
for (int i = 0; i < host.AddressList.Length; i++)
{
localIpAddresses[i] = host.AddressList[i].ToString();
}
return localIpAddresses;
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();
}
uint iDstAddr = lIpFromString(hostDetail[0]);
uint iDstMask = lIpFromString(hostDetail[1]);
filter.wDstPort = UInt16.Parse(hostDetail[2]);
filter.wDstPortHighRange = UInt16.Parse(hostDetail[2]);
//convert the string IP to an unsigned int for p/invoke
UInt32 lLocalIp = lIpFromString(localAddress);
unsafe
{
filter.SrcAddr = &iSrcAddr;
filter.DstAddr = &iDstAddr;
filter.SrcMask = &iSrcMask;
filter.DstMask = &iDstMask;
}
// add filter to interface (both inbound and outbound)
result = IpPacketFilter.PfAddFiltersToInterface(interfaceHandle, 1, ref filter, 1, ref filter, filterHandle);
if (result != 0)
return false;
}
}
}
return true;
}
}
//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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