174 lines
5 KiB
C
174 lines
5 KiB
C
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//+----------------------------------------------------------------------------
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//
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// Copyright (C) 1992, Microsoft Corporation
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//
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// File: log.c
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//
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// Contents: Module to log messages from the driver to the NT event logging
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// system.
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//
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// Classes:
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//
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// Functions: LogWriteMessage()
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//
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// History: 3/30/93 Milans created
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// 04/18/93 SudK modified to use a MessageFile. and some
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// cleanup to the function below.
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//
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//-----------------------------------------------------------------------------
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#include "dfsprocs.h"
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#define Dbg DEBUG_TRACE_EVENTLOG
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VOID LogpPutString(
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IN PUNICODE_STRING pustrString,
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IN OUT PCHAR *ppStringBuffer,
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IN OUT UCHAR *pcbBuffer);
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text( PAGE, LogWriteMessage )
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#pragma alloc_text( PAGE, LogpPutString )
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#endif // ALLOC_PRAGMA
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//+----------------------------------------------------------------------------
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//
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// Function: LogWriteMessage
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//
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// Synopsis: Logs a message to the NT event logging system.
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//
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// Arguments: [UniqueErrCode] -- The code that identifes the message.
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// [NtStatusCode] -- Status code from some error.
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// [nStrings] -- Number of strings being passed in.
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// [pustrArg] -- The Array of insertion strings.
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//
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// Returns: Nothing at all.
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//
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// History: 04/18/93 SudK Created.
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//
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//-----------------------------------------------------------------------------
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VOID LogWriteMessage(
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IN ULONG UniqueErrorCode,
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IN NTSTATUS NtStatusCode,
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IN ULONG nStrings,
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IN PUNICODE_STRING pustrArg OPTIONAL)
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{
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PIO_ERROR_LOG_PACKET pErrorLog;
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UCHAR cbSize;
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UCHAR *pStringBuffer;
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ULONG i;
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//
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// Compute the size of the Error Log Packet that we need to start with.
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//
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cbSize = sizeof(IO_ERROR_LOG_PACKET);
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for (i = 0; i < nStrings; i++) {
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cbSize = (UCHAR)(cbSize + pustrArg[i].Length + sizeof(WCHAR));
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}
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if (cbSize > ERROR_LOG_MAXIMUM_SIZE) {
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cbSize = ERROR_LOG_MAXIMUM_SIZE;
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}
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pErrorLog = (PIO_ERROR_LOG_PACKET) IoAllocateErrorLogEntry(
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DfsData.DriverObject,
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cbSize);
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if (!pErrorLog) {
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//
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// Well, I guess we won't be logging this one.
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//
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return;
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}
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//
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// Zero out all fields, then set the ones we want.
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//
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RtlZeroMemory((PVOID) pErrorLog, sizeof(IO_ERROR_LOG_PACKET));
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pErrorLog->FinalStatus = NtStatusCode;
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pErrorLog->ErrorCode = UniqueErrorCode;
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pErrorLog->NumberOfStrings = (USHORT) nStrings;
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pErrorLog->StringOffset = sizeof(IO_ERROR_LOG_PACKET);
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pStringBuffer = ((PCHAR) pErrorLog) + sizeof(IO_ERROR_LOG_PACKET);
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//
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// Copy the strings into the buffer, making sure we truncate if and when
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// we need to.
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//
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cbSize -= sizeof(IO_ERROR_LOG_PACKET);
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for (i = 0; i < nStrings; i++) {
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LogpPutString(&pustrArg[i], &pStringBuffer, &cbSize);
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}
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//
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// And finally, write out the log
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//
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IoWriteErrorLogEntry(pErrorLog);
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}
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//+----------------------------------------------------------------------------
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//
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// Function: LogpPutString
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//
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// Synopsis: Copies a string into the buffer part of an IO_ERROR_LOG_PACKET.
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// Takes care of truncating if the whole string won't fit.
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//
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// Arguments: [pustrString] -- Pointer to unicode string to copy.
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// [ppStringBuffer] -- On input, pointer to beginning of buffer
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// to copy to. On exit, will point one past the
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// end of the copied string.
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// [pcbBuffer] -- On input, max size of buffer. On output,
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// remaining size after string has been copied.
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//
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// Returns: Nothing
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//
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// History: 04/18/93 SudK Created.
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//
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//-----------------------------------------------------------------------------
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VOID LogpPutString(
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IN PUNICODE_STRING pustrString,
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IN OUT PCHAR *ppStringBuffer,
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IN OUT UCHAR *pcbBuffer)
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{
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ULONG len;
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PWCHAR pwch;
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if ((*pcbBuffer == 0) || (pustrString->Length == 0)) {
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return;
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}
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if ( *pcbBuffer >= (pustrString->Length + sizeof(WCHAR)) ) {
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RtlMoveMemory(*ppStringBuffer, pustrString->Buffer, pustrString->Length);
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(*pcbBuffer) -= pustrString->Length;
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(*ppStringBuffer) += pustrString->Length;
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} else {
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RtlMoveMemory(*ppStringBuffer, pustrString->Buffer, (*pcbBuffer)-sizeof(WCHAR));
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*pcbBuffer = sizeof(WCHAR);
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(*ppStringBuffer) += (*pcbBuffer - sizeof(WCHAR));
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}
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//
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// Null Terminate the String Now if necessary.
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//
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if (*((PWCHAR) *ppStringBuffer - 1) != L'\0') {
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*((PWCHAR) *ppStringBuffer) = L'\0';
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*ppStringBuffer += sizeof(WCHAR);
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(*pcbBuffer) -= sizeof(WCHAR);
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}
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}
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