Sample Code
Windows Driver Samples/ Windows Filtering Platform Sample/ C++/ lib/ HelperFunctions_FwpmProviderContext.cpp/
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All Rights Reserved.//// Module Name:// HelperFunctions_FwpmFilter.cpp//// Abstract:// This module contains functions which assist in actions pertaining to FWPM_FILTER objects.//// Naming Convention://// <Scope><Module><Object><Action><Modifier>// // i.e.//// <Scope>// {// - Function is likely visible to other modules.// Prv - Function is private to this module.// }// <Module>// {// Hlpr - Function is from HelperFunctions_* Modules.// }// <Object>// {// FwpmProviderContext - Function pertains to FWPM_PROVIDER_CONTEXT objects.// }// <Action>// {// Add - Function adds an object.// Create - Function allocates memory for an object.// Delete - Function deletes an object.// Destroy - Function frees memory for an object.// Enum - Function returns list of requested objects.// Remove - Function deletes objects.// }// <Modifier>// {// All - Functions acts on all of WFPSampler's provider contexts.// ByKey - Function acts off of the object's GUID.// EnumHandle - Function acts on the enumeration handle.// }//// Private Functions://// Public Functions:// HlprFwpmProviderContextAdd(),// HlprFwpmProviderContextCreateEnumHandle(),// HlprFwpmProviderContextDeleteByKey(),// HlprFwpmProviderContextDestroyEnumHandle(),// HlprFwpmProviderContextEnum(),// HlprFwpmProviderContextRemoveAll(),//// Author:// Dusty Harper (DHarper)//// Revision History://// [ Month ][Day] [Year] - [Revision]-[ Comments ]// May 01, 2010 - 1.0 - Creation//////////////////////////////////////////////////////////////////////////////////////////////////////#include "HelperFunctions_Include.h" /// ./** @helper_function="HlprFwpmProviderContextDeleteByKey" Purpose: Wrapper for the FwpmProviderContextDeleteByKey API. <br> <br> Notes: <br> <br>*/_Success_(return == NO_ERROR)UINT32 HlprFwpmProviderContextDeleteByKey(_In_ const HANDLE engineHandle, _In_ const GUID* pProviderContextKey){ ASSERT(engineHandle); ASSERT(pProviderContextKey); UINT32 status = NO_ERROR; status = FwpmProviderContextDeleteByKey(engineHandle, pProviderContextKey); if(status != NO_ERROR) { if(status != FWP_E_IN_USE && status != FWP_E_BUILTIN_OBJECT && status != FWP_E_PROVIDER_CONTEXT_NOT_FOUND) HlprLogError(L"HlprFwpmProviderContextDeleteByKey : FwpmProviderContextDeleteByKey() [status: %#x]", status); else { HlprLogInfo(L"HlprFwpmProviderContextDeleteByKey : FwpmProviderContextDeleteByKey() [status: %#x]", status); status = NO_ERROR; } } return status;}/** @helper_function="HlprFwpmProviderContextAdd" Purpose: Wrapper for the FwpmProviderContextAdd API. <br> <br> Notes: ProviderContext ID is written to pProviderContext->providerContextId. <br> <br>*/_Success_(return == NO_ERROR)UINT32 HlprFwpmProviderContextAdd(_In_ const HANDLE engineHandle, _Inout_ FWPM_PROVIDER_CONTEXT* pProviderContext){ ASSERT(engineHandle); ASSERT(pProviderContext); UINT32 status = NO_ERROR; status = FwpmProviderContextAdd(engineHandle, pProviderContext, 0, &(pProviderContext->providerContextId)); if(status != NO_ERROR) { if(status == FWP_E_ALREADY_EXISTS) { HlprLogInfo(L"ProviderContext Already Exists"); status = NO_ERROR; } else HlprLogError(L"HlprFwpmProviderContextAdd : FwpmProviderContextAdd() [status: %#x]", status); } return status;}/** @helper_function="HlprFwpmProviderContextEnum" Purpose: Wrapper for the FwpmProviderContextEnum API. <br> <br> Notes: <br> <br>*/_At_(*pppEntries, _Pre_ _Null_)_When_(return != NO_ERROR, _At_(*pppEntries, _Post_ _Null_))_Success_(return == NO_ERROR)UINT32 HlprFwpmProviderContextEnum(_In_ const HANDLE engineHandle, _In_ const HANDLE enumHandle, _In_ const UINT32 numEntriesRequested, _Outptr_result_buffer_maybenull_(*pNumEntriesReturned) FWPM_PROVIDER_CONTEXT*** pppEntries, _Out_ UINT32* pNumEntriesReturned){ ASSERT(engineHandle); ASSERT(enumHandle); ASSERT(numEntriesRequested); ASSERT(pppEntries); ASSERT(pNumEntriesReturned); UINT32 status = NO_ERROR; status = FwpmProviderContextEnum(engineHandle, enumHandle, numEntriesRequested, pppEntries, pNumEntriesReturned); if(status != NO_ERROR && status != FWP_E_PROVIDER_CONTEXT_NOT_FOUND && status != FWP_E_NOT_FOUND) { *pppEntries = 0; *pNumEntriesReturned = 0; HlprLogError(L"HlprFwpmProviderContextEnum : FwpmProviderContextEnum() [status: %#x]", status); } return status;}/** @helper_function="HlprFwpmProviderContextDestroyEnumHandle" Purpose: Wrapper for the FwpmProviderContextDestroyEnumHandle API. <br> <br> Notes: <br> <br> MSDN_Ref: HTTP://MSDN.Microsoft.com/En-US/Library/AA364185.aspx <br>*/_When_(return != NO_ERROR, _At_(*pEnumHandle, _Post_ _Notnull_))_When_(return == NO_ERROR, _At_(*pEnumHandle, _Post_ _Null_))_Success_(return == NO_ERROR)UINT32 HlprFwpmProviderContextDestroyEnumHandle(_In_ const HANDLE engineHandle, _Inout_ HANDLE* pEnumHandle){ UINT32 status = NO_ERROR; if(engineHandle && pEnumHandle) { if(*pEnumHandle) { status = FwpmProviderContextDestroyEnumHandle(engineHandle, *pEnumHandle); if(status != NO_ERROR) { HlprLogError(L"HlprFwpmProviderContextDestroyEnumHandle : FwpmProviderContextDestroyEnumHandle() [status: %#x]", status); HLPR_BAIL; } *pEnumHandle = 0; } } else { status = ERROR_INVALID_PARAMETER; HlprLogError(L"HlprFwpmProviderContextDestroyEnumHandle() [status: %#x][engineHandle: %#p][pEnumHandle: %#p]", status, engineHandle, pEnumHandle); } HLPR_BAIL_LABEL: return status;}/** @helper_function="HlprFwpmProviderContextCreateEnumHandle" Purpose: Wrapper for the FwpmProviderContextCreateEnumHandle API. <br> <br> Notes: <br> <br>*/_When_(return != NO_ERROR, _At_(*pEnumHandle, _Post_ _Null_))_When_(return == NO_ERROR, _At_(*pEnumHandle, _Post_ _Notnull_))_Success_(return == NO_ERROR)UINT32 HlprFwpmProviderContextCreateEnumHandle(_In_ const HANDLE engineHandle, _In_opt_ const FWPM_PROVIDER_CONTEXT_ENUM_TEMPLATE* pEnumTemplate, _Out_ HANDLE* pEnumHandle){ ASSERT(engineHandle); ASSERT(pEnumHandle); UINT32 status = NO_ERROR; status = FwpmProviderContextCreateEnumHandle(engineHandle, pEnumTemplate, pEnumHandle); if(status != NO_ERROR) HlprLogError(L"HlprFwpmProviderContextCreateEnumHandle : FwpmProviderContextCreateEnumHandle() [status: %#x]", status); return status;}/** @helper_function="HlprFwpmProviderContextRemoveAll" Purpose: Remove all providerContexts associated with the specified provider. <br> <br> Notes: <br> <br> MSDN_Ref: <br>*/_Success_(return == NO_ERROR)UINT32 HlprFwpmProviderContextRemoveAll(_In_opt_ HANDLE* pEngineHandle, _In_opt_ const GUID* pProviderContextKey){ UINT32 status = NO_ERROR; HANDLE engineHandle = 0; HANDLE enumHandle = 0; BOOLEAN isLocal = FALSE; FWPM_PROVIDER_CONTEXT** ppProviderContexts = 0; UINT32 providerContextCount = 0; FWPM_PROVIDER_CONTEXT_ENUM_TEMPLATE enumTemplate = {0}; if(pEngineHandle && *pEngineHandle) engineHandle = *pEngineHandle; else { status = HlprFwpmEngineOpen(&engineHandle); HLPR_BAIL_ON_FAILURE(status); isLocal = TRUE; } enumTemplate.providerKey = (GUID*)pProviderContextKey; status = HlprFwpmProviderContextCreateEnumHandle(engineHandle, &enumTemplate, &enumHandle); HLPR_BAIL_ON_FAILURE(status); status = HlprFwpmProviderContextEnum(engineHandle, enumHandle, 0xFFFFFFFF, &ppProviderContexts, &providerContextCount); if(ppProviderContexts && providerContextCount) { for(UINT32 providerContextIndex = 0; providerContextIndex < providerContextCount; providerContextIndex++) { HlprFwpmProviderContextDeleteByKey(engineHandle, &(ppProviderContexts[providerContextIndex]->providerContextKey)); } FwpmFreeMemory((void**)&ppProviderContexts); } HlprFwpmProviderContextDestroyEnumHandle(engineHandle, &enumHandle); HLPR_BAIL_LABEL: if(engineHandle && isLocal) HlprFwpmEngineClose(&engineHandle); return status;} |
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