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Useful Lite Effective Firewall .NET

, 5 Jan 2007
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Take control of your computer using iphlpapi.dll

Introduction

This goal of this article is to show how anyone can implement their own firewall using iphlpapi.dll. I have included a BUGGY and not fully functional GUI to show you the way. If you do implement a better GUI, I will be happy to replace the one I included here.

[DllImport("iphlpapi.dll", EntryPoint = "PfCreateInterface")]
        public static extern int PfCreateInterface(
                                        int dwName,
                                        PFFORWARD_ACTION inAction,
                                        PFFORWARD_ACTION outAction,
                                        bool UseLog,
                                        bool MustBeUnique,
                                        ref IntPtr ppInterface
                                        );

        [DllImport("iphlpapi.dll", EntryPoint = "PfDeleteInterface")]
        public static extern int PfDeleteInterface(
                                        IntPtr pInterface
                                        );

        [DllImport("iphlpapi.dll", EntryPoint = "PfBindInterfaceToIndex")]
        public static extern int PfBindInterfaceToIndex(
                                        IntPtr Interface_handle,
                                        int dwIndex,
                                        PFADDRESSTYPE pfatLinkType,
                                        ref int LinkIPAddress
                                        );

        [DllImport("iphlpapi.dll", EntryPoint = "PfBindInterfaceToIPAddress")]
        public static extern int PfBindInterfaceToIPAddress(
                                        IntPtr Interface_handle,
                                        PFADDRESSTYPE pfatType,
                                        ref int ip_address
                                        );

        [DllImport("iphlpapi.dll", EntryPoint = "PfUnBindInterface")]
        public static extern int PfUnBindInterface(
                                        IntPtr pInterface
                                        );

        [DllImport("iphlpapi.dll", EntryPoint = "PfAddFiltersToInterface")]
        public static extern int PfAddFiltersToInterface(
                                        IntPtr interface_handle,
                                        int cInFilters,
                                        [MarshalAsAttribute(UnmanagedType.Struct)] 
                                        ref PPF_FILTER_DESCRIPTOR pfiltIn,
                                        int cOutFilters,
                                        [MarshalAsAttribute(UnmanagedType.Struct)]
                                        ref PPF_FILTER_DESCRIPTOR pfiltOut,
                                        [MarshalAsAttribute(UnmanagedType.Struct)]
                                        ref PPF_FILTER_DESCRIPTOR pfHandle
                                        );

        [DllImport("iphlpapi.dll", EntryPoint = "PfRemoveFiltersFromInterface")]
        public static extern int PfRemoveFiltersFromInterface(
                                        IntPtr ih,
                                        int cInFilters,
                                        [MarshalAsAttribute(UnmanagedType.Struct)]
                                        ref PPF_FILTER_DESCRIPTOR pfiltIn,
                                        int cOutFilters,
                                        [MarshalAsAttribute(UnmanagedType.Struct)]
                                        ref PPF_FILTER_DESCRIPTOR pfiltOut
                                        );

        [DllImport("iphlpapi.dll", EntryPoint = "PfRemoveFilterHandles")]
        public static extern int PfRemoveFilterHandles(
                                        IntPtr interface_handle,
                                        int count_Filters,
                                        [MarshalAsAttribute(UnmanagedType.Struct)] 
                                        ref PPF_FILTER_DESCRIPTOR pvHandles
                                        );

        [DllImport("iphlpapi.dll", EntryPoint = "PfRebindFilters")]
        public static extern int PfRebindFilters(
                                        IntPtr pInterface,
                                        [MarshalAsAttribute(UnmanagedType.Struct)]
                                        ref PPF_LATEBIND_INFO pLateBindInfo
                                        );

        [DllImport("iphlpapi.dll", EntryPoint = "PPfAddGlobalFilterToInterface")]
        public static extern int PfAddGlobalFilterToInterface(
                                        IntPtr interface_handle,
                                        [MarshalAsAttribute(UnmanagedType.Struct)]
                                        ref GLOBAL_FILTER gfFilter
                                        );

        [DllImport("iphlpapi.dll", EntryPoint = "PfRemoveGlobalFilterFromInterface")]
        public static extern int PfRemoveGlobalFilterFromInterface(
                                        IntPtr interface_handle,
                                        [MarshalAsAttribute(UnmanagedType.Struct)]
                                        ref GLOBAL_FILTER gfFilter
                                        );

        [DllImport("iphlpapi.dll", EntryPoint = "SetIpTTL")]
        public static extern int SetIpTTL(uint ttl);

History

  • 5th January, 2007: Initial post

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

About the Author

Oz Jundi
Engineer TECO GROUP - Jundi Electrical Industry
United States United States
if you have any questions please send an email :
 
ojundi @ [%s].info
 
Oz [Jundi]

Comments and Discussions

 
Questionthanks for the api functions PinmemberDamian 228-Sep-11 23:50 
Questionnot work!!!! Pinmembersalar_master29-Aug-11 3:02 
QuestionBlock All ports except one for a specified IP Pinmemberqinta12-Nov-09 9:50 
General测试 Pinmembervanery29-Jun-09 16:07 
Generalhello~ PinmemberBok Deuk Song27-May-09 0:49 
GeneralGood One but.... Pinmemberjazznewbie11-Mar-09 13:07 
GeneralRe: Good One but.... Pinmemberjazznewbie11-Mar-09 13:26 
GeneralRe: Good One but.... Pinmemberjazznewbie19-Mar-09 2:11 
GeneralNo interfaces showing PinmemberPaul Rabe9-Feb-09 23:59 
GeneralI also get the stack exception 6 Pinmemberblipsnart23-Nov-07 5:52 
GeneralYeah! PinmemberRunnerDude6-Jul-07 8:32 
QuestionVista: Error 120 [modified] PinmemberRichardBPutnam23-May-07 6:06 
AnswerRe: Vista: Error 120 Pinmemberjjkaczor16-Nov-07 14:35 
GeneralRe: Vista: Error 120 PinmemberRichardBPutnam19-Nov-07 5:10 
GeneralRe: Vista: Error 120 Pinmemberpowerranger12322-Mar-09 7:53 
QuestionCould not add filter 6 Pinmemberbcodebcode25-Jan-07 10:47 
AnswerRe: Could not add filter 6 PinmemberOz Jundi25-Jan-07 16:09 
GeneralRe: Could not add filter 6 Pinmemberbcodebcode26-Jan-07 4:09 
GeneralRe: Could not add filter 6 Pinmemberyoney mike21-May-07 9:57 
GeneralRe: Could not add filter 6 PinmemberMember 402502230-Dec-07 15:18 
GeneralProblem About Tho Most Simplest FireWall Pinmemberumut_8416-Jan-07 2:32 
GeneralWOW! PinmemberHawk7778-Jan-07 21:00 
GeneralFree Firewalls PinmemberVasudevan Deepak Kumar5-Jan-07 21:51 
GeneralRe: Free Firewalls PinmemberOz Jundi6-Jan-07 6:16 
GeneralRe: Free Firewalls PinmemberThomas Fanell8-Jan-07 10:57 

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