171 lines
3.8 KiB
C
171 lines
3.8 KiB
C
/*++
|
|
|
|
Copyright (c) 1996-1999 Microsoft Corporation
|
|
|
|
Module Name:
|
|
|
|
event.c
|
|
|
|
Abstract:
|
|
|
|
DNS event logging.
|
|
|
|
Author:
|
|
|
|
Ramv June-02-1997
|
|
|
|
Revision History:
|
|
|
|
--*/
|
|
|
|
|
|
#include "local.h"
|
|
|
|
#define DNSAPI_LOG_SOURCE (L"DnsApi")
|
|
|
|
|
|
//
|
|
// Globals to suppress event logging
|
|
//
|
|
|
|
DWORD g_TimeLastDnsEvent = 0;
|
|
DWORD g_DnsEventCount = 0;
|
|
|
|
#define DNS_EVENTS_MAX_COUNT (5)
|
|
#define DNS_EVENT_LOG_BLOCK_INTERVAL (1800) // 30 minutes
|
|
|
|
|
|
|
|
VOID
|
|
DnsLogEvent(
|
|
IN DWORD MessageId,
|
|
IN WORD EventType,
|
|
IN DWORD NumberOfSubStrings,
|
|
IN LPSTR * SubStrings,
|
|
IN DWORD ErrorCode
|
|
)
|
|
{
|
|
HANDLE logHandle;
|
|
DWORD dataLength = 0;
|
|
PVOID pdata = NULL;
|
|
|
|
//
|
|
// protect against log spin
|
|
//
|
|
// we'll allow a few events to log, then slam the door for
|
|
// a while to avoid filling event log
|
|
//
|
|
// note: none of these protection structures are MT safe, but
|
|
// there's no issue here, the failure mode is allowing an additional
|
|
// log entry or denying one that should now be allowed; I don't
|
|
// believe there's any failure mode that permanently turns logging
|
|
// to always on or always off
|
|
//
|
|
|
|
if ( g_DnsEventCount > DNS_EVENTS_MAX_COUNT )
|
|
{
|
|
DWORD currentTime = Dns_GetCurrentTimeInSeconds();
|
|
if ( g_TimeLastDnsEvent + DNS_EVENT_LOG_BLOCK_INTERVAL > currentTime )
|
|
{
|
|
DNS_PRINT((
|
|
"DNSAPI: Refusing event logging!\n"
|
|
"\tevent count = %d\n"
|
|
"\tlast time = %d\n"
|
|
"\tcurrent time = %d\n",
|
|
g_DnsEventCount,
|
|
g_TimeLastDnsEvent,
|
|
currentTime ));
|
|
return;
|
|
}
|
|
|
|
// interval has elapsed, clear counters and continue logging
|
|
|
|
g_DnsEventCount = 0;
|
|
}
|
|
|
|
|
|
#if 0
|
|
//
|
|
// open event log -- if haven't already
|
|
//
|
|
// DCR_PERF: better to just open this and close on process detach?
|
|
// will be open for services (maybe netlogon) but not much else
|
|
//
|
|
|
|
if ( !g_DnsEventlogHandle )
|
|
{
|
|
HANDLE hlog;
|
|
|
|
hlog = RegisterEventSourceW(
|
|
NULL,
|
|
DNSAPI_LOG_SOURCE
|
|
);
|
|
if ( hlog == NULL )
|
|
{
|
|
DNS_PRINT(("DNSAPI : RegisterEventSourceA failed %lu\n",
|
|
GetLastError()));
|
|
return;
|
|
}
|
|
g_DnsEventlogHandle = hlog;
|
|
}
|
|
#endif
|
|
|
|
//
|
|
// open event log
|
|
//
|
|
|
|
logHandle = RegisterEventSourceW(
|
|
NULL,
|
|
DNSAPI_LOG_SOURCE
|
|
);
|
|
if ( logHandle == NULL )
|
|
{
|
|
DNS_PRINT(("DNSAPI : RegisterEventSourceA failed %lu\n",
|
|
GetLastError()));
|
|
return;
|
|
}
|
|
|
|
//
|
|
// log the event
|
|
// - get ptr and sizeof data
|
|
//
|
|
|
|
if ( ErrorCode != NO_ERROR )
|
|
{
|
|
dataLength = sizeof(DWORD);
|
|
pdata = (PVOID) &ErrorCode;
|
|
}
|
|
|
|
//
|
|
// DCR_FIX0: event logging should be unicode
|
|
//
|
|
|
|
ReportEventA(
|
|
logHandle,
|
|
EventType,
|
|
0, // event category
|
|
MessageId,
|
|
(PSID) NULL,
|
|
(WORD) NumberOfSubStrings,
|
|
dataLength,
|
|
(LPSTR *)SubStrings,
|
|
pdata );
|
|
|
|
DeregisterEventSource( logHandle );
|
|
|
|
//
|
|
// successful logging spin protection
|
|
// - inc count
|
|
// - if at max, save last logging time
|
|
//
|
|
|
|
if ( ++g_DnsEventCount >= DNS_EVENTS_MAX_COUNT )
|
|
{
|
|
g_TimeLastDnsEvent = Dns_GetCurrentTimeInSeconds();
|
|
}
|
|
}
|
|
|
|
//
|
|
// End of event.c
|
|
//
|