phrocker commented on a change in pull request #648: WIP: Minificpp 1025 -- add metadata URL: https://github.com/apache/nifi-minifi-cpp/pull/648#discussion_r329140749
########## File path: extensions/windows-event-log/wel/WindowsEventLog.cpp ########## @@ -0,0 +1,200 @@ +/** + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +#include <winmeta.h> +#include "WindowsEventLog.h" +#include "utils/Deleters.h" +#include <algorithm> + +namespace org { +namespace apache { +namespace nifi { +namespace minifi { +namespace wel { + + +void WindowsEventLogMetadata::renderMetadata() { + DWORD status = ERROR_SUCCESS; + DWORD dwBufferSize = 0; + DWORD dwBufferUsed = 0; + DWORD dwPropertyCount = 0; + std::unique_ptr< EVT_VARIANT, utils::FreeDeleter> rendered_values; + + auto context = EvtCreateRenderContext(0, NULL, EvtRenderContextSystem); + if (!EvtRender(context, event_ptr_, EvtRenderEventValues, dwBufferSize, nullptr, &dwBufferUsed, &dwPropertyCount)) + { + if (ERROR_INSUFFICIENT_BUFFER == (status = GetLastError())) + { + dwBufferSize = dwBufferUsed; + rendered_values = std::unique_ptr<EVT_VARIANT, utils::FreeDeleter>((PEVT_VARIANT)(malloc(dwBufferSize))); + if (rendered_values) + { + EvtRender(context, event_ptr_, EvtRenderEventValues, dwBufferSize, rendered_values.get(), &dwBufferUsed, &dwPropertyCount); + } + } + else { + return; + } + + if (ERROR_SUCCESS != (status = GetLastError())) + { + return; + } + } + + event_timestamp_ = static_cast<PEVT_VARIANT>( rendered_values.get())[EvtSystemTimeCreated].FileTimeVal; + + SYSTEMTIME st; + FILETIME ft; + + ft.dwHighDateTime = (DWORD)((event_timestamp_ >> 32) & 0xFFFFFFFF); + ft.dwLowDateTime = (DWORD)(event_timestamp_ & 0xFFFFFFFF); + + FileTimeToSystemTime(&ft, &st); + std::stringstream datestr; + + std::string period = "AM"; + auto hour = st.wHour; + if (hour >= 12 && hour < 24) + period = "PM"; + if (hour >= 12) + hour -= 12; + datestr << st.wMonth << "/" << st.wDay << "/" << st.wYear << " " << std::setfill('0') << std::setw(2) << hour << ":" << std::setfill('0') << std::setw(2) << st.wMinute << ":" << std::setfill('0') << std::setw(2) << st.wSecond << " " << period; + event_timestamp_str_ = datestr.str(); + auto level = static_cast<PEVT_VARIANT>(rendered_values.get())[EvtSystemLevel]; + auto keyword = static_cast<PEVT_VARIANT>(rendered_values.get())[EvtSystemKeywords]; + if (level.Type == EvtVarTypeByte) { + switch (level.ByteVal) + { + case WINEVENT_LEVEL_CRITICAL: + case WINEVENT_LEVEL_ERROR: + event_type_ = "Error"; + event_type_index_ = 1; + break; + case WINEVENT_LEVEL_WARNING: + event_type_ = "Warning"; + event_type_index_ = 2; + break; + case WINEVENT_LEVEL_INFO: + case WINEVENT_LEVEL_VERBOSE: + event_type_ = "Information"; + event_type_index_ = 4; + break; + default: + event_type_index_ = 0; + }; + + } + else { + event_type_ = "N/A"; + } + + if (keyword.UInt64Val & WINEVENT_KEYWORD_AUDIT_SUCCESS) { + event_type_ = "Success Audit"; + event_type_index_ = 8; + } else if (keyword.UInt64Val & EVENTLOG_AUDIT_FAILURE) { + event_type_ = "Failure Audit"; + event_type_index_ = 16; + } + + + +} + +std::string WindowsEventLogHandler::getEventMessage(EVT_HANDLE eventHandle) const +{ + std::string returnValue; + std::unique_ptr<WCHAR, utils::FreeDeleter> pBuffer; + DWORD dwBufferSize = 0; + DWORD dwBufferUsed = 0; + DWORD status = 0; + + EvtFormatMessage(metadata_provider_, eventHandle, 0, 0, NULL, EvtFormatMessageEvent, dwBufferSize, pBuffer.get(), &dwBufferUsed); + + // we need to get the size of the buffer + status = GetLastError(); + if (ERROR_INSUFFICIENT_BUFFER == status) { + dwBufferSize = dwBufferUsed; + + /* All C++ examples use malloc and even HeapAlloc in some cases. To avoid any problems ( with EvtFormatMessage calling + free for example ) we will continue to use malloc and use a custom deleter with unique_ptr. + '*/ + pBuffer = std::unique_ptr<WCHAR, utils::FreeDeleter>((LPWSTR)malloc(dwBufferSize * sizeof(WCHAR))); + + + if (pBuffer) { + EvtFormatMessage(metadata_provider_, eventHandle, 0, 0, NULL, EvtFormatMessageEvent, dwBufferSize, pBuffer.get(), &dwBufferUsed); + } + else { + return returnValue; + } + } + else if (ERROR_EVT_MESSAGE_NOT_FOUND == status || ERROR_EVT_MESSAGE_ID_NOT_FOUND == status) { + return returnValue; + } + else { + return returnValue; Review comment: don't disagree @am-c-p-p can you take a look at this comment too? ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. 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