Sample Code
Windows Driver Samples/ Windows Filtering Platform Sample/ C++/ lib/ HelperFunctions_FwpmSubLayer.cpp/
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All Rights Reserved.//// Module Name:// HelperFunctions_FwpmSubLayer.cpp//// Abstract:// This module contains functions which assist in actions pertaining to FWPM_SUBLAYER objects.//// Naming Convention://// <Scope><Module><Object><Action><Modifier>// // i.e.//// <Scope>// {// - Function is likely visible to other modules.// }// <Module>// {// Hlpr - Function is from HelperFunctions_* Modules.// }// <Object>// {// FwpmSubLayer - Function pertains to FWPM_SUBLAYER objects.// }// <Action>// {// Add - Function adds an object.// Remove - Function deletes objects.// }// <Modifier>// {// DefaultGlobal - Function acts on the programs constant global object.// }// Private Functions://// Public Functions:// HlprFwpmSubLayerAddDefaultGlobal(),// HlprFwpmSubLayerRemoveDefaultGlobal(),//// Author:// Dusty Harper (DHarper)//// Revision History://// [ Month ][Day] [Year] - [Revision]-[ Comments ]// May 01, 2010 - 1.0 - Creation//////////////////////////////////////////////////////////////////////////////////////////////////////#include "HelperFunctions_Include.h" /// ./** @helper_function="HlprFwpmSubLayerEnum" Purpose: Wrapper for the FwpmSubLayerEnum API. <br> <br> Notes: <br> <br> MSDN_Ref: HTTP://MSDN.Microsoft.com/En-US/Library/AA364211.aspx <br>*/_At_(*pppEntries, _Pre_ _Null_)_When_(return != NO_ERROR, _At_(*pppEntries, _Post_ _Null_))_Success_(return == NO_ERROR)UINT32 HlprFwpmSubLayerEnum(_In_ const HANDLE engineHandle, _In_ const HANDLE enumHandle, _In_ const UINT32 numEntriesRequested, _Outptr_result_buffer_maybenull_(*pNumEntriesReturned) FWPM_SUBLAYER*** pppEntries, _Out_ UINT32* pNumEntriesReturned){ UINT32 status = NO_ERROR; if(engineHandle && enumHandle && numEntriesRequested && pppEntries && pNumEntriesReturned) { status = FwpmSubLayerEnum(engineHandle, enumHandle, numEntriesRequested, pppEntries, pNumEntriesReturned); if(status != NO_ERROR && status != FWP_E_SUBLAYER_NOT_FOUND && status != FWP_E_NOT_FOUND) HlprLogError(L"HlprFwpmSubLayerEnum : FwpmSubLayerEnum() [status: %#x]", status); } else { if(pppEntries) *pppEntries = 0; if(pNumEntriesReturned) *pNumEntriesReturned = 0; status = ERROR_INVALID_PARAMETER; HlprLogError(L"HlprFwpmSubLayerEnum() [status: %#x][engineHandle: %#p][enumHandle: %#p][numEntriesRequested: %d][pppEntries: %#p][pNumEntriesReturned: %#p]", status, engineHandle, enumHandle, numEntriesRequested, pppEntries, pNumEntriesReturned); } return status;}/** @helper_function="HlprFwpmSubLayerDestroyEnumHandle" Purpose: Wrapper for the FwpmSubLayerDestroyEnumHandle API. <br> <br> Notes: <br> <br> MSDN_Ref: HTTP://MSDN.Microsoft.com/En-US/Library/AA364210.aspx <br>*/_When_(return != NO_ERROR, _At_(*pEnumHandle, _Post_ _Notnull_))_When_(return == NO_ERROR, _At_(*pEnumHandle, _Post_ _Null_))_Success_(return == NO_ERROR)UINT32 HlprFwpmSubLayerDestroyEnumHandle(_In_ const HANDLE engineHandle, _Inout_ HANDLE* pEnumHandle){ UINT32 status = NO_ERROR; if(engineHandle && pEnumHandle) { if(*pEnumHandle) { status = FwpmSubLayerDestroyEnumHandle(engineHandle, *pEnumHandle); if(status != NO_ERROR) { HlprLogError(L"HlprFwpmSubLayerDestroyEnumHandle : FwpmSubLayerDestroyEnumHandle() [status: %#x]", status); HLPR_BAIL; } *pEnumHandle = 0; } } else { status = ERROR_INVALID_PARAMETER; HlprLogError(L"HlprFwpmSubLayerDestroyEnumHandle() [status: %#x][engineHandle: %#p][pEnumHandle: %#p]", status, engineHandle, pEnumHandle); } HLPR_BAIL_LABEL: return status;}/** @helper_function="HlprFwpmSubLayerCreateEnumHandle" Purpose: Wrapper for the FwpmSubLayerCreateEnumHandle API. <br> <br> Notes: <br> <br> MSDN_Ref: HTTP://MSDN.Microsoft.com/En-US/Library/AA364208.aspx <br>*/_When_(return != NO_ERROR, _At_(*pEnumHandle, _Post_ _Null_))_When_(return == NO_ERROR, _At_(*pEnumHandle, _Post_ _Notnull_))_Success_(return == NO_ERROR)UINT32 HlprFwpmSubLayerCreateEnumHandle(_In_ const HANDLE engineHandle, _In_opt_ const FWPM_SUBLAYER_ENUM_TEMPLATE* pEnumTemplate, _Out_ HANDLE* pEnumHandle){ UINT32 status = NO_ERROR; if(engineHandle && pEnumHandle) { status = FwpmSubLayerCreateEnumHandle(engineHandle, pEnumTemplate, pEnumHandle); if(status != NO_ERROR) HlprLogError(L"HlprFwpmSubLayerCreateEnumHandle : FwpmSubLayerCreateEnumHandle() [status: %#x]", status); } else { status = ERROR_INVALID_PARAMETER; HlprLogError(L"HlprFwpmSubLayerCreateEnumHandle() [status: %#x][engineHandle: %#p][pEnumHandle: %#p]", status, engineHandle, pEnumHandle); } return status;}/** @helper_function="HlprFwpmSubLayerDeleteByKey" Purpose: Wrapper for the FwpmSubLayerDeleteByKey API. <br> <br> Notes: <br> <br> MSDN_Ref: HTTP://MSDN.Microsoft.com/En-US/Library/AA364209.aspx <br>*/_Success_(return == NO_ERROR)UINT32 HlprFwpmSubLayerDeleteByKey(_In_ const HANDLE engineHandle, _In_ const GUID* pSubLayerKey){ UINT32 status = NO_ERROR; if(engineHandle) { if(pSubLayerKey) { status = FwpmSubLayerDeleteByKey(engineHandle, pSubLayerKey); if(status != NO_ERROR) { if(status != FWP_E_IN_USE && status != FWP_E_BUILTIN_OBJECT && status != FWP_E_SUBLAYER_NOT_FOUND) HlprLogError(L"HlprFwpmSubLayerDeleteByKey : FwpmSubLayerDeleteByKey() [status: %#x]", status); else { HlprLogInfo(L"HlprFwpmSubLayerDeleteByKey : FwpmSubLayerDeleteByKey() [status: %#x]", status); status = NO_ERROR; } } } } else { status = ERROR_INVALID_PARAMETER; HlprLogError(L"HlprFwpmSubLayerDeleteByKey() [status: %#x][engineHandle: %#p]", status, engineHandle); } return status;}/** @helper_function="HlprFwpmSubLayerAdd" Purpose: Add a sublayer to associate with all of this program's filters. <br> <br> Notes: By default sublayer is weighted just below the weight of FWPM_SUBLAYER_UNIVERSAL so IPsec decryption will occur prior to invocation of any of WFPSampler's callout routines. <br> <br> MSDN_Ref: HTTP://MSDN.Microsoft.com/En-US/Library/AA364207.aspx <br>*/_Success_(return == NO_ERROR)UINT32 HlprFwpmSubLayerAdd(_In_ HANDLE engineHandle, _In_ const GUID* pSubLayerKey, _In_ PCWSTR pSubLayerName, _In_ const GUID* pProviderKey, _In_ UINT16 weight, /* 0x7FFF */ _In_ UINT32 flags) /* FWPM_SUBLAYER_FLAG_PERSISTENT */{ UINT32 status = NO_ERROR; if(engineHandle) { FWPM_SUBLAYER subLayer = {0}; subLayer.subLayerKey = *pSubLayerKey; subLayer.displayData.name = (PWSTR)pSubLayerName; subLayer.flags = flags; subLayer.providerKey = (GUID*)pProviderKey; subLayer.weight = weight; status = FwpmSubLayerAdd(engineHandle, &subLayer, 0); if(status != NO_ERROR) { if(status == FWP_E_ALREADY_EXISTS) { HlprLogInfo(L"SubLayer Already Exists"); status = NO_ERROR; } else HlprLogError(L"HlprFwpmSubLayerAdd : FwpmSubLayerAdd() [status: %#x]", status); } } else { status = ERROR_INVALID_PARAMETER; HlprLogError(L"HlprFwpmSubLayerAdd() [status: %#x]", status); } return status;}/** @helper_function="HlprFwpmSubLayerDelete" Purpose: Remove the sublayer that was associated with all of WFPSampler's filters. <br> <br> Notes: Function will fail if any of WFPSampler's filters are still present and associated with this sublayer. <br> <br> MSDN_Ref: HTTP://MSDN.Microsoft.com/En-US/Library/AA364209.aspx <br>*/_Success_(return == NO_ERROR)UINT32 HlprFwpmSubLayerDelete(_In_opt_ HANDLE* pEngineHandle, _In_ const GUID* pSubLayerKey){ UINT32 status = NO_ERROR; HANDLE engineHandle = 0; BOOLEAN isLocal = FALSE; if(pEngineHandle && *pEngineHandle) engineHandle = *pEngineHandle; else { status = HlprFwpmEngineOpen(&engineHandle); HLPR_BAIL_ON_FAILURE(status); isLocal = TRUE; } status = FwpmSubLayerDeleteByKey(engineHandle, pSubLayerKey); if(status != NO_ERROR) { if(status != FWP_E_SUBLAYER_NOT_FOUND && status != FWP_E_IN_USE) HlprLogError(L"HlprFwpmSubLayerDelete : FwpmSubLayerDeleteByKey() [status: %#x]", status); else { HlprLogInfo(L"HlprFwpmSubLayerDelete : FwpmSubLayerDeleteByKey() [status: %#x]", status); status = NO_ERROR; } } HLPR_BAIL_LABEL: if(engineHandle && isLocal) HlprFwpmEngineClose(&engineHandle); return status;} |
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