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windows-nt/Source/XPSP1/NT/admin/pchealth/sr/service/evthandler.cpp

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2020-09-26 03:20:57 -05:00
/******************************************************************************
*
* Copyright (c) 2000 Microsoft Corporation
*
* Module Name:
* evthandler.cpp
*
* Abstract:
* CEventHandler class methods
*
* Revision History:
* Brijesh Krishnaswami (brijeshk) 03/17/2000
* created
*
*****************************************************************************/
#include "precomp.h"
#include "..\rstrcore\resource.h"
#include "ntservmsg.h"
#ifdef THIS_FILE
#undef THIS_FILE
#endif
static char __szTraceSourceFile[] = __FILE__;
#define THIS_FILE __szTraceSourceFile
#define IDLE_STACKSIZE 32768 // 32K stack for idle thread
CEventHandler *g_pEventHandler;
// constructor
CEventHandler::CEventHandler()
{
m_hTimerQueue = m_hTimer = NULL;
m_hIdle = NULL;
m_fNoRpOnSystem = TRUE;
m_fIdleSrvStarted = FALSE;
m_ftFreeze.dwLowDateTime = 0;
m_ftFreeze.dwHighDateTime = 0;
m_nNestedCallCount = 0;
m_hCOMDll = NULL;
m_hIdleRequestHandle = NULL;
m_hIdleStartHandle = NULL;
m_hIdleStopHandle = NULL;
m_fCreateRpASAP = FALSE;
}
// destructor
CEventHandler::~CEventHandler()
{
}
// the RPC API
DWORD
CEventHandler::DisableSRS(LPWSTR pszDrive)
{
DWORD dwRc = ERROR_SUCCESS;
BOOL fHaveLock = FALSE;
HANDLE hEventSource = NULL;
tenter("CEventHandler::DisableSRS");
LOCKORLEAVE(fHaveLock);
ASSERT(g_pDataStoreMgr && g_pSRConfig);
// if whole of SR is disabled, then
// - set firstrun and cleanup flag to yes
// - set stop event
if (! pszDrive || IsSystemDrive(pszDrive))
{
trace(0, "Disabling all of SR");
dwRc = SrStopMonitoring(g_pSRConfig->GetFilter());
if (dwRc != ERROR_SUCCESS)
{
trace(0, "! SrStopMonitoring : %ld", dwRc);
goto done;
}
dwRc = g_pSRConfig->SetFirstRun(SR_FIRSTRUN_YES);
if (dwRc != ERROR_SUCCESS)
{
trace(0, "! SetFirstRun : %ld", dwRc);
goto done;
}
g_pDataStoreMgr->DestroyDataStore(NULL);
if (dwRc != ERROR_SUCCESS)
{
trace(0, "! DestroyDataStore : %ld", dwRc);
goto done;
}
// set the filter start to disabled only if this is a
// real disable
// if it's a reset, filter needs to start the next boot
if (g_pSRConfig->GetResetFlag() == FALSE)
{
dwRc = SetServiceStartup(s_cszFilterName, SERVICE_DISABLED);
if (ERROR_SUCCESS != dwRc)
{
trace(0, "! SetServiceStartup : %ld", dwRc);
goto done;
}
// done, we are disabled
dwRc = g_pSRConfig->SetDisableFlag(TRUE);
if (dwRc != ERROR_SUCCESS)
{
trace(0, "! SetDisableFlag : %ld", dwRc);
goto done;
}
}
// set the stop event
// this will bring us down gracefully
SignalStop();
if (g_pSRConfig->m_dwTestBroadcast)
PostTestMessage(g_pSRConfig->m_uiTMDisable, NULL, NULL);
// write to event log
hEventSource = RegisterEventSource(NULL, s_cszServiceName);
if (hEventSource != NULL)
{
SRLogEvent (hEventSource, EVENTLOG_INFORMATION_TYPE, EVMSG_SYSDRIVE_DISABLED,
NULL, 0, NULL, NULL, NULL);
DeregisterEventSource(hEventSource);
}
trace(0, "SR disabled");
}
else
{
trace(0, "Disabling drive %S", pszDrive);
// first tell filter to stop monitoring,
// then build _filelst.cfg and pass down
dwRc = g_pDataStoreMgr->MonitorDrive(pszDrive, FALSE);
if (ERROR_SUCCESS != dwRc)
{
trace(0, "! g_pDataStoreMgr->MonitorDrive for %s : %ld", pszDrive, dwRc);
goto done;
}
}
done:
UNLOCK(fHaveLock);
tleave();
return dwRc;
}
DWORD
CEventHandler::EnableSRS(LPWSTR pszDrive)
{
tenter("CEventHandler::EnableSRS");
BOOL fHaveLock = FALSE;
DWORD dwRc = ERROR_SUCCESS;
LOCKORLEAVE(fHaveLock);
trace(0, "EnableSRS");
ASSERT(g_pSRConfig);
if (! pszDrive || IsSystemDrive(pszDrive))
{
//
// if safe mode, then don't
//
if (TRUE == g_pSRConfig->GetSafeMode())
{
DebugTrace(0, "Cannot enable SR in safemode");
dwRc = ERROR_BAD_ENVIRONMENT;
goto done;
}
// system drive
g_pSRConfig->SetDisableFlag(FALSE);
dwRc = SetServiceStartup(s_cszFilterName, SERVICE_BOOT_START);
if (ERROR_SUCCESS != dwRc)
{
trace(0, "! SetServiceStartup : %ld", dwRc);
goto done;
}
dwRc = SetServiceStartup(s_cszServiceName, SERVICE_AUTO_START);
if (ERROR_SUCCESS != dwRc)
{
trace(0, "! SetServiceStartup : %ld", dwRc);
goto done;
}
}
else
{
ASSERT(g_pDataStoreMgr);
// build _filelst.cfg and pass down
dwRc = g_pDataStoreMgr->MonitorDrive(pszDrive, TRUE);
if (ERROR_SUCCESS != dwRc)
{
trace(0, "! g_pDataStoreMgr->MonitorDrive for %s : %ld", pszDrive, dwRc);
goto done;
}
}
done:
UNLOCK(fHaveLock);
tleave();
return dwRc;
}
DWORD
CEventHandler::DisableFIFOS(DWORD dwRPNum)
{
tenter("CEventHandler::DisableFIFOS");
BOOL fHaveLock = FALSE;
DWORD dwRc = ERROR_SUCCESS;
LOCKORLEAVE(fHaveLock);
ASSERT(g_pSRConfig);
g_pSRConfig->SetFifoDisabledNum(dwRPNum);
trace(0, "Disabled FIFO from RP%ld", dwRPNum);
done:
UNLOCK(fHaveLock);
tleave();
return dwRc;
}
DWORD
CEventHandler::EnableFIFOS()
{
tenter("CEventHandler::EnableFIFOS");
BOOL fHaveLock = FALSE;
DWORD dwRc = ERROR_SUCCESS;
LOCKORLEAVE(fHaveLock);
ASSERT(g_pSRConfig);
g_pSRConfig->SetFifoDisabledNum(0);
trace(0, "Reenabled FIFO");
done:
UNLOCK(fHaveLock);
tleave();
return dwRc;
}
// API and internal method to create a new restore point -
// this will ask filter to create a restore point folder,
// take the system snapshot, and write the restore point log
BOOL
CEventHandler::SRSetRestorePointS(
PRESTOREPOINTINFOW pRPInfo,
PSTATEMGRSTATUS pSmgrStatus )
{
tenter("CEventHandler::SRSetRestorePointS");
DWORD dwRc = ERROR_SUCCESS;
WCHAR szRPDir[MAX_RP_PATH];
DWORD dwRPNum = 1;
BOOL fHaveLock = FALSE;
HKEY hKey = NULL;
CRestorePoint rpLast;
BOOL fSnapshot = TRUE;
DWORD dwSaveType;
BOOL fUpdateMonitoredList = FALSE;
DWORD dwSnapshotResult = ERROR_SUCCESS;
BOOL fSerialized;
if (! pRPInfo || ! pSmgrStatus)
{
trace(0, "Invalid arguments");
dwRc = ERROR_INVALID_DATA;
goto done;
}
if (pRPInfo->dwRestorePtType > MAX_RPT)
{
trace(0, "Restore point type out of valid range");
dwRc = ERROR_INVALID_DATA;
goto done;
}
if (pRPInfo->dwEventType < MIN_EVENT ||
pRPInfo->dwEventType > MAX_EVENT)
{
trace(0, "Event type out of valid range");
dwRc = ERROR_INVALID_DATA;
goto done;
}
LOCKORLEAVE(fHaveLock);
ASSERT(g_pDataStoreMgr && g_pSRConfig);
//
// special processing for FIRSTRUN checkpoint
//
if (pRPInfo->dwRestorePtType == FIRSTRUN)
{
// first remove the Run key if it exists
// the function run from the Run entry in srclient.dll may not have been
// able to delete itself if it was run in non-admin context
// so we will make sure we delete it here
HKEY hKey;
if (ERROR_SUCCESS == RegOpenKey(HKEY_LOCAL_MACHINE,
L"Software\\Microsoft\\Windows\\CurrentVersion\\Run",
&hKey))
{
RegDeleteValue(hKey, L"SRFirstRun");
RegCloseKey(hKey);
}
// if this is really the first checkpoint
// then allow it no matter who's trying to create it
// if not, then bail
if (m_fNoRpOnSystem == FALSE)
{
trace(0, "Trying to create FirstRun rp when an rp already exists");
dwRc = ERROR_ALREADY_EXISTS;
goto done;
}
}
//
// if this is a restore restore point or system checkpoint,
// then erase any nested rp context
// this will make sure that restore can happen
// even if some erratic client failed to call END_NESTED
//
if (pRPInfo->dwRestorePtType == RESTORE ||
pRPInfo->dwRestorePtType == CHECKPOINT ||
pRPInfo->dwRestorePtType == FIRSTRUN)
{
trace(0, "Resetting nested refcount to 0");
m_nNestedCallCount = 0;
}
//
// get the current rp number
// dwRPNum will be overwritten if a new restore point is created
// after all the prelim checks
//
dwRPNum = (m_fNoRpOnSystem == FALSE) ? m_CurRp.GetNum() : 0;
//
// if this is a nested call
// then don't create nested rps
//
if (pRPInfo->dwEventType == END_NESTED_SYSTEM_CHANGE)
{
// adjust refcount only if called for the current restore point
if (pRPInfo->llSequenceNumber == 0 ||
pRPInfo->llSequenceNumber == dwRPNum)
{
dwRc = ERROR_SUCCESS;
if (m_nNestedCallCount > 0)
m_nNestedCallCount--;
}
else if (pRPInfo->llSequenceNumber < dwRPNum)
{
dwRc = ERROR_SUCCESS;
trace(0, "END_NESTED called for older rp - not adjusting refcount");
}
else
{
dwRc = ERROR_INVALID_DATA;
trace(0, "END_NESTED called for non-existent rp - not adjusting refcount");
}
if (pRPInfo->dwRestorePtType != CANCELLED_OPERATION)
{
goto done;
}
}
else if (pRPInfo->dwEventType == BEGIN_NESTED_SYSTEM_CHANGE)
{
if (m_nNestedCallCount > 0)
{
dwRc = ERROR_SUCCESS;
m_nNestedCallCount++;
goto done;
}
}
// check if this is a request to remove restore point
// provided for backward compat only
// new clients should use SRRemoveRestorePoint
if (pRPInfo->dwEventType == END_SYSTEM_CHANGE ||
pRPInfo->dwEventType == END_NESTED_SYSTEM_CHANGE)
{
if (pRPInfo->dwRestorePtType == CANCELLED_OPERATION)
{
dwRc = SRRemoveRestorePointS((DWORD) pRPInfo->llSequenceNumber);
goto done;
}
else
{
dwRc = ERROR_SUCCESS;
goto done;
}
}
// if this is safe mode, don't create restore point
//
// however, allow restore UI to be able to create a hidden restore point in safemode
//
if (g_pSRConfig->GetSafeMode() == TRUE)
{
if (pRPInfo->dwRestorePtType == CANCELLED_OPERATION)
{
// we need this rp only for undo in case of failure
// so we don't need snapshot (snapshotting will fail in safemode)
trace(0, "Restore rp - creating snapshot in safemode");
}
else
{
trace(0, "Cannot create restore point in safemode");
dwRc = ERROR_BAD_ENVIRONMENT;
goto done;
}
}
//
// if system drive is frozen,
// then see if it can be thawed
// if not, then cannot create rp
//
if (g_pDataStoreMgr->IsDriveFrozen(g_pSRConfig->GetSystemDrive()))
{
if (ERROR_SUCCESS != g_pDataStoreMgr->ThawDrives(TRUE))
{
trace(0, "Cannot create rp when system drive is frozen");
dwRc = ERROR_DISK_FULL;
goto done;
}
}
if (hKey)
RegCloseKey(hKey);
// ask filter to create restore point
// filter will return the restore point number - i for RPi - in dwRPNum
dwRc = SrCreateRestorePoint( g_pSRConfig->GetFilter(), &dwRPNum );
if (ERROR_SUCCESS != dwRc)
{
trace(0, "! SrCreateRestorePoint : %ld", dwRc);
goto done;
}
wsprintf( szRPDir, L"%s%ld", s_cszRPDir, dwRPNum );
//
// update the current restore point object
// write rp.log with cancelled restorepoint type
//
if (m_fNoRpOnSystem == FALSE)
{
rpLast.SetDir(m_CurRp.GetDir());
}
m_CurRp.SetDir(szRPDir);
dwSaveType = pRPInfo->dwRestorePtType;
pRPInfo->dwRestorePtType = CANCELLED_OPERATION;
m_CurRp.Load(pRPInfo);
dwRc = m_CurRp.WriteLog();
if ( ERROR_SUCCESS != dwRc )
{
trace(0, "! WriteLog : %ld", dwRc);
goto done;
}
// create system snapshot
// if there is no explicit regkey that disabled it
if (fSnapshot)
{
WCHAR szFullPath[MAX_PATH];
CSnapshot Snapshot;
if (m_hCOMDll == NULL)
{
m_hCOMDll = LoadLibrary(s_cszCOMDllName);
if (NULL == m_hCOMDll)
{
dwRc = GetLastError();
trace(0, "LoadLibrary of %S failed ec=%d", s_cszCOMDllName, dwRc);
goto done;
}
}
// BUGBUG - this does not seem to make any difference
// so remove it
#if 0
if (FALSE == SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_ABOVE_NORMAL))
{
trace(0, "! SetThreadPriority first");
}
#endif
if (dwSaveType == RESTORE ||
dwSaveType == CANCELLED_OPERATION)
{
fSerialized = TRUE;
trace(0, "Setting fSerialized to TRUE");
}
else
{
fSerialized = FALSE;
trace(0, "Setting fSerialized to FALSE");
}
MakeRestorePath (szFullPath, g_pSRConfig->GetSystemDrive(), szRPDir);
dwRc = Snapshot.CreateSnapshot(szFullPath,
m_hCOMDll,
m_fNoRpOnSystem ? NULL : rpLast.GetDir(),
fSerialized);
#if 0
if (FALSE == SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_NORMAL))
{
trace(0, "! SetThreadPriority second");
}
#endif
dwSnapshotResult = dwRc;
}
// ask the datastoremgr to persist drivetable for old restore point
// and reset per-rp flags for the new restore point
dwRc = g_pDataStoreMgr->SwitchRestorePoint(m_fNoRpOnSystem ? NULL : &rpLast);
if (dwRc != ERROR_SUCCESS)
{
trace(0, "! SwitchRestorePoint : %ld", dwRc);
goto done;
}
m_fNoRpOnSystem = FALSE;
//
// restore point is fully created
// write rp.log again
// this time with the real restorepoint type
//
if (dwSnapshotResult == ERROR_SUCCESS)
{
pRPInfo->dwRestorePtType = dwSaveType;
m_CurRp.Load(pRPInfo);
dwRc = m_CurRp.WriteLog();
if ( ERROR_SUCCESS != dwRc )
{
trace(0, "! WriteLog : %ld", dwRc);
goto done;
}
trace(0, "****Created %S %S****", szRPDir, pRPInfo->szDescription);
}
else
{
trace(0, "****Cancelled %S - snapshot failed", szRPDir);
}
// if drives need to be thawed, then recreate blob
// and deactivate thaw timer
if ( TRUE == g_pDataStoreMgr->IsDriveFrozen(NULL) )
{
if (ERROR_SUCCESS == g_pDataStoreMgr->ThawDrives(FALSE))
{
m_ftFreeze.dwLowDateTime = 0;
m_ftFreeze.dwHighDateTime = 0;
fUpdateMonitoredList = TRUE;
}
else
{
dwRc = ERROR_DISK_FULL;
goto done;
}
}
// Also update the filter monitored list blob if this is an idle
// time restore point or if this is the first run restore
// point. We update the monitored list at first run since the
// initial blob is created before the first user logs on to the
// machine and before the first user's profile exists. So we want
// to update rhe monitored list at first run since by now the
// user's profile has been created.
if (fUpdateMonitoredList ||
(pRPInfo->dwRestorePtType == CHECKPOINT) ||
(pRPInfo->dwRestorePtType == FIRSTRUN) )
{
dwRc = SRUpdateMonitoredListS(NULL);
}
//
// if rp creation succeeded,
// and this is the outermost nested call
// then bump refcount to 1
//
if (dwRc == ERROR_SUCCESS &&
pRPInfo->dwEventType == BEGIN_NESTED_SYSTEM_CHANGE)
{
m_nNestedCallCount = 1;
}
//
// send thaw complete test message
//
if (fUpdateMonitoredList)
{
if (g_pSRConfig->m_dwTestBroadcast)
PostTestMessage(g_pSRConfig->m_uiTMThaw, NULL, NULL);
}
// if WMI is serialized, then check fifo conditions here
// else this would happen in DoWMISnapshot
if (fSerialized)
{
g_pDataStoreMgr->TriggerFreezeOrFifo();
}
done:
trace(0, "Nest level : %d", m_nNestedCallCount);
if (dwSnapshotResult != ERROR_SUCCESS)
dwRc = dwSnapshotResult;
// populate return struct
if (pSmgrStatus)
{
pSmgrStatus->nStatus = dwRc;
pSmgrStatus->llSequenceNumber = (INT64) dwRPNum;
}
UNLOCK( fHaveLock );
tleave();
return ( dwRc == ERROR_SUCCESS ) ? TRUE : FALSE;
}
// this api is provided to remove a restore point
// removing a restore point simply takes away the ability to restore
// to this point - all the changes in this restore point are preserved
DWORD
CEventHandler::SRRemoveRestorePointS(
DWORD dwRPNum)
{
tenter("CEventHandler::SRRemoveRestorePointS");
BOOL fHaveLock = FALSE;
WCHAR szRPDir[MAX_PATH];
WCHAR szFullPath[MAX_PATH];
DWORD dwRc = ERROR_SUCCESS;
CSnapshot Snapshot;
CRestorePoint rp;
CDataStore *pds = NULL;
INT64 llOld, llNew;
if (dwRPNum < 1)
{
dwRc = ERROR_INVALID_DATA;
goto done;
}
LOCKORLEAVE(fHaveLock);
ASSERT(g_pSRConfig);
// if there is no rp, then no-op
if (m_fNoRpOnSystem)
{
dwRc = ERROR_INVALID_DATA;
goto done;
}
wsprintf(szRPDir, L"%s%ld", s_cszRPDir, dwRPNum);
// read the restore point log
rp.SetDir(szRPDir);
dwRc = rp.ReadLog();
if (ERROR_SUCCESS != dwRc)
{
trace(0, "! rp.ReadLog : %ld", dwRc);
dwRc = ERROR_INVALID_DATA;
goto done;
}
// delete snapshot
MakeRestorePath (szFullPath, g_pSRConfig->GetSystemDrive(), szRPDir);
dwRc = Snapshot.DeleteSnapshot(szFullPath);
if (dwRc != ERROR_SUCCESS)
goto done;
// cancel this restore point
rp.Cancel();
//
// adjust the restorepointsize file
// and the in-memory counters in the service
//
pds = g_pDataStoreMgr->GetDriveTable()->FindSystemDrive();
if (! pds)
{
trace(0, "! FindSystemDrive");
goto done;
}
llOld = 0;
dwRc = rp.ReadSize(g_pSRConfig->GetSystemDrive(), &llOld);
if (dwRc != ERROR_SUCCESS)
{
trace(0, "! rp.ReadSize : %ld", dwRc);
goto done;
}
llNew = 0;
dwRc = pds->CalculateRpUsage(&rp, &llNew, TRUE, FALSE);
if (dwRc != ERROR_SUCCESS)
{
trace(0, "! CalculateRpUsage : %ld", dwRc);
goto done;
}
trace(0, "llOld = %I64d, llNew = %I64d", llOld, llNew);
//
// now update the correct variable in the correct object
//
pds->UpdateDataStoreUsage (llNew - llOld, rp.GetNum() == m_CurRp.GetNum());
done:
UNLOCK(fHaveLock);
tleave();
return dwRc;
}
DWORD
CEventHandler::SRUpdateMonitoredListS(
LPWSTR pszXMLFile)
{
tenter("CEventHandler::SRUpdateMonitoredListS");
DWORD dwRc = ERROR_INTERNAL_ERROR;
BOOL fHaveLock = FALSE;
LOCKORLEAVE(fHaveLock);
ASSERT(g_pDataStoreMgr && g_pSRConfig);
// convert xml to blob
dwRc = XmlToBlob(pszXMLFile);
if (ERROR_SUCCESS != dwRc)
goto done;
// reload to filter
dwRc = SrReloadConfiguration(g_pSRConfig->GetFilter());
if (ERROR_SUCCESS != dwRc)
{
trace(0, "! SrReloadConfiguration : %ld", dwRc);
goto done;
}
trace(0, "****Reloaded config file****");
done:
UNLOCK(fHaveLock);
tleave();
return dwRc;
}
DWORD
CEventHandler::SRUpdateDSSizeS(LPWSTR pwszVolumeGuid, UINT64 ullSizeLimit)
{
tenter("CEventHandler::SRUpdateDSSizeS");
UINT64 ullTemp;
DWORD dwRc = ERROR_SUCCESS;
CDataStore *pds = NULL;
BOOL fHaveLock = FALSE;
BOOL fSystem;
LOCKORLEAVE(fHaveLock);
ASSERT(g_pDataStoreMgr);
pds = g_pDataStoreMgr->GetDriveTable()->FindDriveInTable(pwszVolumeGuid);
if (! pds)
{
trace(0, "Volume not in drivetable : %S", pwszVolumeGuid);
dwRc = ERROR_INVALID_DRIVE;
goto done;
}
fSystem = pds->GetFlags() & SR_DRIVE_SYSTEM;
if (ullSizeLimit < (g_pSRConfig ? g_pSRConfig->GetDSMin(fSystem) :
(fSystem ? SR_DEFAULT_DSMIN:SR_DEFAULT_DSMIN_NONSYSTEM)
* MEGABYTE))
{
trace(0, "SRUpdateDSSizeS %I64d less than dwDSMin", ullSizeLimit);
dwRc = ERROR_INVALID_PARAMETER;
goto done;
}
ullTemp = pds->GetSizeLimit(); // save previous size
pds->SetSizeLimit(0); // reset the datastore size
pds->UpdateDiskFree (NULL); // calculate the default size
if (ullSizeLimit > pds->GetSizeLimit())
{
pds->SetSizeLimit (ullTemp);
trace(0, "SRUpdateDSSizeS %I64d greater than limit", ullSizeLimit);
dwRc = ERROR_INVALID_PARAMETER;
goto done;
}
pds->SetSizeLimit(ullSizeLimit);
g_pDataStoreMgr->GetDriveTable()->SaveDriveTable((CRestorePoint *) NULL);
//
// this might change fifo conditions
// so check and trigger fifo if necessary
//
g_pDataStoreMgr->TriggerFreezeOrFifo();
done:
UNLOCK(fHaveLock);
tleave();
return dwRc;
}
DWORD
CEventHandler::SRSwitchLogS()
{
tenter("CEventHandler::SRSwitchLogS");
DWORD dwRc = ERROR_SUCCESS;
BOOL fHaveLock;
LOCKORLEAVE(fHaveLock);
ASSERT(g_pSRConfig);
dwRc = SrSwitchAllLogs(g_pSRConfig->GetFilter());
if (ERROR_SUCCESS != dwRc)
trace(0, "! SrSwitchLog : %ld", dwRc);
done:
UNLOCK(fHaveLock);
tleave();
return dwRc;
}
DWORD
CEventHandler::XmlToBlob(LPWSTR pszwXml)
{
tenter("CEventHandler::XmlToBlob");
DWORD dwRc = ERROR_INTERNAL_ERROR;
WCHAR szwDat[MAX_PATH], szwXml[MAX_PATH];
CFLDatBuilder FLDatBuilder;
ASSERT(g_pSRConfig);
MakeRestorePath(szwDat, g_pSRConfig->GetSystemDrive(), s_cszFilelistDat);
if (0 == ExpandEnvironmentStrings(s_cszWinRestDir, szwXml, sizeof(szwXml) / sizeof(WCHAR)))
{
dwRc = GetLastError();
trace(0, "! ExpandEnvironmentStrings");
goto done;
}
lstrcat(szwXml, s_cszFilelistXml);
if ( ! pszwXml )
{
pszwXml = szwXml;
}
if (FALSE == FLDatBuilder.BuildTree(pszwXml, szwDat))
{
trace(0, "! FLDatBuilder.BuildTree");
goto done;
}
if (pszwXml && pszwXml != szwXml && 0 != lstrcmpi(pszwXml, szwXml))
{
// copy the new filelist
SetFileAttributes(szwXml, FILE_ATTRIBUTE_NORMAL);
if (FALSE == CopyFile(pszwXml, szwXml, FALSE))
{
dwRc = GetLastError();
trace(0, "! CopyFile : %ld", dwRc);
goto done;
}
}
// set filelist.xml to be S+H+R
SetFileAttributes(szwXml, FILE_ATTRIBUTE_SYSTEM | FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_READONLY);
dwRc = ERROR_SUCCESS;
done:
tleave();
return dwRc;
}
// SR ACTIONS
DWORD
CEventHandler::OnFirstRun()
{
tenter("CEventHandler::OnFirstRun");
DWORD dwRc = ERROR_SUCCESS;
RESTOREPOINTINFO RPInfo;
STATEMGRSTATUS SmgrStatus;
LPSTR pszDat = NULL, pszXml = NULL;
WCHAR szwDat[MAX_PATH], szwXml[MAX_PATH];
trace(0, "Firstrun detected");
dwRc = XmlToBlob(NULL);
if (ERROR_SUCCESS != dwRc)
goto done;
// ask filter to start monitoring
dwRc = SrStartMonitoring(g_pSRConfig->GetFilter());
if (ERROR_SUCCESS != dwRc)
{
trace(0, "! SrStartMonitoring : %ld", dwRc);
goto done;
}
// change firstrun in the registry
dwRc = g_pSRConfig->SetFirstRun(SR_FIRSTRUN_NO);
if ( dwRc != ERROR_SUCCESS )
{
trace(0, "! g_pSRConfig->SetFirstRun : %ld", dwRc);
goto done;
}
// create firstrun restore point
if (! g_pDataStoreMgr->IsDriveFrozen(g_pSRConfig->GetSystemDrive()) &&
g_pSRConfig->GetCreateFirstRunRp() != 0)
{
RPInfo.dwEventType = BEGIN_SYSTEM_CHANGE;
RPInfo.dwRestorePtType = FIRSTRUN;
if (ERROR_SUCCESS != SRLoadString(L"srrstr.dll", IDS_SYSTEM_CHECKPOINT_TEXT, RPInfo.szDescription, MAX_PATH))
{
trace(0, "Using default hardcoded text");
lstrcpy(RPInfo.szDescription, s_cszSystemCheckpointName);
}
if ( FALSE == SRSetRestorePointS( &RPInfo, &SmgrStatus ))
{
//
// even if this fails
// keep the service running
//
trace(0, "Cannot create firstrun restore point : %ld", SmgrStatus.nStatus);
}
}
//
// in future re-enables, service should create firstrun rp
//
if (g_pSRConfig->m_dwCreateFirstRunRp == 0)
g_pSRConfig->SetCreateFirstRunRp(TRUE);
done:
tleave();
return dwRc;
}
// stuff to do at boot
// read in all the config values from registry
// initialize communication with filter
// call OnFirstRun if necessary
// setup timer & idle detection
// start RPC server
DWORD
CEventHandler::OnBoot()
{
BOOL fHaveLock = FALSE;
DWORD dwRc = ERROR_INTERNAL_ERROR;
BOOL fSendEnableMessage = FALSE;
DWORD dwFlags;
tenter("CEventHandler::OnBoot");
dwRc = m_DSLock.Init();
if (dwRc != ERROR_SUCCESS)
{
trace(0, "m_DSLock.Init() : %ld", dwRc);
goto done;
}
LOCKORLEAVE(fHaveLock);
// initialize the counter
dwRc = m_Counter.Init();
if ( ERROR_SUCCESS != dwRc )
{
trace(0, "! CCounter::Init : %ld", dwRc);
goto done;
}
// read all values from registry
// create global events
g_pSRConfig = new CSRConfig;
if ( ! g_pSRConfig )
{
dwRc = ERROR_NOT_ENOUGH_MEMORY;
trace(0, "Out of Memory");
goto done;
}
dwRc = g_pSRConfig->Initialize();
if ( ERROR_SUCCESS != dwRc )
{
trace(0, "! g_pSRConfig->Initialize : %ld", dwRc);
goto done;
}
trace(0, "SRBoottask: SRConfig initialized");
if ( g_pSRConfig->GetDisableFlag() == TRUE )
{
// check if we're forced to enable
if ( g_pSRConfig->GetDisableFlag_GroupPolicy() == FALSE )
{
dwRc = EnableSRS(NULL);
if (ERROR_SUCCESS != dwRc)
{
trace(0, "! EnableSRS : %ld", dwRc);
goto done;
}
}
else
{
// we are not forced to enable
// so we don't need to check if group policy is not configured or is disabling us
// since we are disabled anyway
trace(0, "SR is disabled - stopping");
dwRc = ERROR_SERVICE_DISABLED;
goto done;
}
}
// open the filter handle
// this will load the filter if not already loaded
dwRc = g_pSRConfig->OpenFilter();
if ( ERROR_SUCCESS != dwRc )
{
trace(0, "! g_pSRConfig->OpenFilter : %ld", dwRc);
goto done;
}
trace(0, "SRBoottask: Filter handle opened");
//
// we might do a firstrun if the datastore is corrupted
// (_filelst.cfg missing)
// in this case, the filter might be ON
// turn off the filter
//
if ( g_pSRConfig->GetFirstRun() == SR_FIRSTRUN_YES )
{
dwRc = SrStopMonitoring(g_pSRConfig->GetFilter());
trace(0, "SrStopMonitoring returned : %ld", dwRc);
}
// initialize the datastore
g_pDataStoreMgr = new CDataStoreMgr;
if ( ! g_pDataStoreMgr )
{
trace(0, "Out of Memory");
dwRc = ERROR_NOT_ENOUGH_MEMORY;
goto done;
}
dwRc = g_pDataStoreMgr->Initialize (g_pSRConfig->GetFirstRun() == SR_FIRSTRUN_YES);
if ( ERROR_SUCCESS != dwRc )
{
trace(0, "! g_pDataStore.Initialize : %ld", dwRc);
goto done;
}
trace(0, "SRBoottask: Datastore initialized");
// check if we are newly disabled from group policy
if ( g_pSRConfig->GetDisableFlag_GroupPolicy() == TRUE &&
g_pSRConfig->GetDisableFlag() == FALSE )
{
DisableSRS (NULL);
dwRc = ERROR_SERVICE_DISABLED;
goto done;
}
// check if this is first run
if ( g_pSRConfig->GetFirstRun() == SR_FIRSTRUN_YES )
{
fSendEnableMessage = TRUE;
dwRc = OnFirstRun( );
if ( ERROR_SUCCESS != dwRc )
{
trace(0, "! OnFirstRun : %ld", dwRc);
goto done;
}
trace(0, "SRBoottask: FirstRun completed");
}
// remember the latest restore point
RefreshCurrentRp(TRUE);
if (ERROR_SUCCESS == g_pDataStoreMgr->GetFlags(g_pSRConfig->GetSystemDrive(), &dwFlags))
{
if (dwFlags & SR_DRIVE_ERROR)
{
// a volume error happened in the last session
// we should create a restore point at next idle time
m_fCreateRpASAP = TRUE;
trace(0, "Volume error occurred in last session - create rp at next idle");
}
}
else
{
trace(0, "! g_pDataStoreMgr->GetFlags()");
}
// register filter ioctls
if (! QueueUserWorkItem(PostFilterIo, (PVOID) MAX_IOCTLS, WT_EXECUTEDEFAULT))
{
dwRc = GetLastError();
trace(0, "! QueueUserWorkItem : %ld", dwRc);
goto done;
}
// start idle time detection
// register idle callback
if (FALSE == RegisterWaitForSingleObject(&m_hIdleRequestHandle,
g_pSRConfig->m_hIdleRequestEvent,
(WAITORTIMERCALLBACK) IdleRequestCallback,
NULL,
g_pSRConfig->m_dwIdleInterval*1000,
WT_EXECUTEDEFAULT))
{
dwRc = GetLastError();
trace(0, "! RegisterWaitForSingleObject : %ld", dwRc);
goto done;
}
// now request for idle
SetEvent(g_pSRConfig->m_hIdleRequestEvent);
//
// if there are no mounted drives
// shell will give us all the notifications
// so don't start timer thread
//
// BUGBUG - keep this?
// don't start timer at all
// if (FALSE == g_pDataStoreMgr->GetDriveTable()->AnyMountedDrives())
// {
g_pSRConfig->m_dwTimerInterval = 0;
// }
// set up timer
dwRc = InitTimer();
if ( ERROR_SUCCESS != dwRc )
{
trace(0, "! InitTimer : %ld", dwRc);
goto done;
}
// start rpc server
dwRc = RpcServerStart();
if (ERROR_SUCCESS != dwRc)
{
trace(0, "! RpcServerStart : %ld", dwRc);
goto done;
}
// all initialization complete
SetEvent( g_pSRConfig->m_hSRInitEvent );
if (fSendEnableMessage)
{
// write to event log
HANDLE hEventSource = RegisterEventSource(NULL, s_cszServiceName);
if (hEventSource != NULL)
{
SRLogEvent (hEventSource, EVENTLOG_INFORMATION_TYPE, EVMSG_SYSDRIVE_ENABLED,
NULL, 0, NULL, NULL, NULL);
DeregisterEventSource(hEventSource);
}
if (g_pSRConfig->m_dwTestBroadcast)
PostTestMessage(g_pSRConfig->m_uiTMEnable, NULL, NULL);
}
done:
UNLOCK(fHaveLock);
tleave( );
return dwRc;
}
// method to shutdown the service gracefully
void
CEventHandler::OnStop()
{
DWORD dwRc;
tenter("CEventHandler::OnStop");
if (g_pSRConfig == NULL)
{
trace(0, "g_pSRConfig = NULL");
goto Err;
}
// stop everything
// BUGBUG - do we need to take the lock here?
// since all the stops are blocking in themselves
// and this has to preempt any running activity,
// blocking here is not such a good idea
// stop the rpc server
RpcServerShutdown();
trace(0, "SRShutdowntask: RPC server shutdown");
// kill the timer and timer queue
EndTimer();
trace(0, "SRShutdownTask: Timer stopped");
//
// blocking calls to unregister idle event callbacks
//
if (m_hIdleRequestHandle != NULL)
{
if (FALSE == UnregisterWaitEx(m_hIdleRequestHandle, INVALID_HANDLE_VALUE))
{
trace(0, "! UnregisterWaitEx : %ld", GetLastError());
}
m_hIdleRequestHandle = NULL;
}
if (m_hIdleStartHandle != NULL)
{
if (FALSE == UnregisterWaitEx(m_hIdleStartHandle, INVALID_HANDLE_VALUE))
{
trace(0, "! UnregisterWaitEx : %ld", GetLastError());
}
m_hIdleStartHandle = NULL;
}
if (m_hIdleStopHandle != NULL)
{
if (FALSE == UnregisterWaitEx(m_hIdleStopHandle, INVALID_HANDLE_VALUE))
{
trace(0, "! UnregisterWaitEx : %ld", GetLastError());
}
m_hIdleStopHandle = NULL;
}
// we are done with the filter
g_pSRConfig->CloseFilter();
trace(0, "Filter handle closed");
// wait for any queued user work items and pending IOCTLs to complete
m_Counter.WaitForZero();
trace(0, "SRShutdownTask: Pending ioctls + work items completed");
//
// free the COM+ db dll
//
if (NULL != m_hCOMDll)
{
_VERIFY(TRUE==FreeLibrary(m_hCOMDll));
m_hCOMDll = NULL;
}
// kill the datastoremgr
if (g_pDataStoreMgr)
{
g_pDataStoreMgr->SignalStop();
delete g_pDataStoreMgr;
g_pDataStoreMgr = NULL;
}
// kill SRConfig
if (g_pSRConfig)
{
delete g_pSRConfig;
g_pSRConfig = NULL;
}
Err:
tleave();
return;
}
DWORD
CEventHandler::OnFreeze( LPWSTR pszDrive )
{
tenter("CEventHandler::OnFreeze");
DWORD dwRc = ERROR_INTERNAL_ERROR;
BOOL fHaveLock;
LOCKORLEAVE(fHaveLock);
ASSERT(g_pDataStoreMgr);
//
// if drive is already frozen, no-op
//
if (g_pDataStoreMgr->IsDriveFrozen(pszDrive))
{
dwRc = ERROR_SUCCESS;
goto done;
}
dwRc = g_pDataStoreMgr->FreezeDrive( pszDrive );
if ( ERROR_SUCCESS != dwRc )
{
trace(0, "! g_pDataStoreMgr->FreezeDrive : %ld", dwRc);
}
done:
UNLOCK( fHaveLock );
tleave();
return dwRc;
}
DWORD
CEventHandler::OnReset(LPWSTR pszDrive)
{
tenter("CEventHandler::OnReset");
BOOL fHaveLock;
DWORD dwRc = ERROR_INTERNAL_ERROR;
ASSERT(g_pSRConfig);
LOCKORLEAVE(fHaveLock);
g_pSRConfig->SetResetFlag(TRUE);
dwRc = DisableSRS(pszDrive);
if (ERROR_SUCCESS != dwRc)
goto done;
// if not system drive, enable this drive
// else, the service will stop
// and do a firstrun the next boot
if (pszDrive && ! IsSystemDrive(pszDrive))
{
dwRc = EnableSRS(pszDrive);
}
done:
UNLOCK(fHaveLock);
tleave();
return dwRc;
}
DWORD
CEventHandler::OnFifo(
LPWSTR pszDrive,
DWORD dwTargetRp,
int nTargetPercent,
BOOL fIncludeCurrentRp,
BOOL fFifoAtleastOneRp)
{
tenter("CEventHandler::OnFifo");
BOOL fHaveLock;
DWORD dwRc = ERROR_INTERNAL_ERROR;
LOCKORLEAVE(fHaveLock);
ASSERT(g_pDataStoreMgr);
dwRc = g_pDataStoreMgr->Fifo(pszDrive, dwTargetRp, nTargetPercent, fIncludeCurrentRp, fFifoAtleastOneRp);
if (dwRc != ERROR_SUCCESS)
{
trace(0, "! g_pDataStoreMgr->Fifo : %ld", dwRc);
}
done:
UNLOCK(fHaveLock);
tleave();
return dwRc;
}
DWORD
CEventHandler::OnCompress(LPWSTR pszDrive)
{
tenter("CEventHandler::OnCompress");
BOOL fHaveLock;
DWORD dwRc = ERROR_INTERNAL_ERROR;
LOCKORLEAVE(fHaveLock);
ASSERT(g_pDataStoreMgr && g_pSRConfig);
dwRc = g_pDataStoreMgr->Compress(pszDrive,
g_pSRConfig->m_dwCompressionBurst);
if (ERROR_SUCCESS != dwRc)
{
trace(0, "! g_pDataStoreMgr->Compress : %ld", dwRc);
}
done:
UNLOCK(fHaveLock);
tleave();
return dwRc;
}
DWORD
CEventHandler::SRPrintStateS()
{
tenter("CEventHandler::SRPrintStateS");
BOOL fHaveLock;
DWORD dwRc = ERROR_SUCCESS;
HANDLE hFile = INVALID_HANDLE_VALUE;
WCHAR wcsPath[MAX_PATH];
LOCKORLEAVE(fHaveLock);
ASSERT(g_pDataStoreMgr);
if (0 == ExpandEnvironmentStrings(L"%temp%\\sr.txt", wcsPath, MAX_PATH))
{
dwRc = GetLastError();
trace(0, "! ExpandEnvironmentStrings : %ld", dwRc);
goto done;
}
hFile = CreateFileW (wcsPath, // file name
GENERIC_WRITE, // file access
0, // share mode
NULL, // SD
CREATE_ALWAYS, // how to create
0, // file attributes
NULL); // handle to template file
if (INVALID_HANDLE_VALUE == hFile)
{
dwRc = GetLastError();
trace(0, "! CreateFileW : %ld", dwRc);
goto done;
}
trace(0, "**** SR State ****");
dwRc = g_pDataStoreMgr->GetDriveTable()->ForAllDrives(CDataStore::Print, (LONG_PTR) hFile);
trace(0, "**** SR State ****");
done:
if (hFile != INVALID_HANDLE_VALUE)
CloseHandle(hFile);
UNLOCK(fHaveLock);
tleave();
return dwRc;
}
// timer
// this needs to monitor datastore size and free disk space on all drives
// and trigger fifo/freeze if needed
DWORD
CEventHandler::OnTimer(
LPVOID lpParam,
BOOL fTimeout)
{
DWORD dwRc = ERROR_SUCCESS;
LPWSTR pszDrive = NULL;
DWORD dwFlags;
BOOL fHaveLock;
SDriveTableEnumContext dtec = {NULL, 0};
tenter("CEventHandler::OnTimer");
// get the lock within 5 seconds
// if we can't get the lock, then don't block
// we shall come back 2 minutes later and try again
// the wait times are such that idle callback has a somewhat
// higher priority than timer to get the lock
LOCKORLEAVE_EX(fHaveLock, 5000);
// got the lock - no one else is doing anything
ASSERT(g_pDataStoreMgr && g_pSRConfig);
// trigger freeze or fifo on each drive
// this will :
// a. check free space and trigger freeze or fifo
// b. check datastore usage percent and trigger fifo
g_pDataStoreMgr->TriggerFreezeOrFifo();
done:
UNLOCK(fHaveLock);
tleave();
return dwRc;
}
// open filter handle and register ioctls
DWORD WINAPI
PostFilterIo(PVOID pNum)
{
tenter("CEventHandler::SendIOCTLs");
DWORD dwRc = ERROR_SUCCESS;
INT index;
ASSERT(g_pSRConfig && g_pEventHandler);
//
// if shutting down, don't bother to post
//
if (IsStopSignalled(g_pSRConfig->m_hSRStopEvent))
{
trace(0, "Stop signalled - not posting io requests");
goto done;
}
//
// bind the completion to a callback
//
if ( ! BindIoCompletionCallback(g_pSRConfig->GetFilter(),
IoCompletionCallback,
0) )
{
dwRc = GetLastError();
trace(0, "! BindIoCompletionCallback : %ld", dwRc);
goto done;
}
//
// post io completion requests
//
for (index = 0; index < (INT_PTR) pNum; index++)
{
CHAR pszEventName[MAX_PATH];
LPSR_OVERLAPPED pOverlap = NULL;
DWORD nBytes =0 ;
pOverlap = (LPSR_OVERLAPPED) SRMemAlloc( sizeof(SR_OVERLAPPED) );
if (! pOverlap)
{
trace(0, "! Out of memory");
dwRc = ERROR_NOT_ENOUGH_MEMORY;
goto done;
}
// create an event, a handle, and put it in the completion port.
memset( &pOverlap->m_overlapped, 0, sizeof(OVERLAPPED) );
pOverlap->m_dwRecordLength = sizeof(SR_NOTIFICATION_RECORD)
+ (SR_MAX_FILENAME_LENGTH*sizeof(WCHAR));
pOverlap->m_pRecord =
(PSR_NOTIFICATION_RECORD) SRMemAlloc(pOverlap->m_dwRecordLength);
ASSERT(g_pSRConfig);
pOverlap->m_hDriver = g_pSRConfig->GetFilter();
// post ioctl - this should return ERROR_IO_PENDING
dwRc = SrWaitForNotification( pOverlap->m_hDriver,
pOverlap->m_pRecord ,
pOverlap->m_dwRecordLength,
(LPOVERLAPPED) pOverlap );
if ( dwRc != 0 && dwRc != ERROR_IO_PENDING )
{
trace(0, "! SrWaitForNotification : %ld", dwRc);
goto done;
}
g_pEventHandler->GetCounter()->Up( ); // one more pending ioctl
}
trace(0, "Filter Io posted");
done:
tleave();
return dwRc;
}
// FILTER NOTIFICATION HANDLERS
// generic notification handler
extern "C" void CALLBACK
IoCompletionCallback(
DWORD dwErrorCode,
DWORD dwBytesTrns,
LPOVERLAPPED pOverlapped )
{
ULONG uError = 0;
LPSR_OVERLAPPED pSROverlapped = (LPSR_OVERLAPPED) pOverlapped;
BOOL fResubmit = FALSE;
WCHAR szVolumeGuid[MAX_PATH], szTemp[MAX_PATH];
tenter("IoCompletionCallback");
if (! pSROverlapped || pSROverlapped->m_hDriver == INVALID_HANDLE_VALUE)
{
trace(0, "! Null overlapped or driver handle");
goto done;
}
trace(0, "Received filter notification : errorcode=%08x, type=%08x",
dwErrorCode, pSROverlapped->m_pRecord->NotificationType);
if ( dwErrorCode != 0 ) // we cancelled it
{
trace(0, "Cancelled operation");
goto done;
}
UnicodeStringToWchar(pSROverlapped->m_pRecord->VolumeName, szTemp);
wsprintf(szVolumeGuid, L"\\\\?\\Volume%s\\", szTemp);
// handle notification
ASSERT(g_pEventHandler);
ASSERT(g_pSRConfig);
if (! g_pEventHandler || ! g_pSRConfig)
{
trace(0, "global is NULL");
goto done;
}
switch( pSROverlapped->m_pRecord->NotificationType )
{
case SrNotificationVolumeFirstWrite:
g_pEventHandler->OnFirstWrite_Notification(szVolumeGuid);
break;
case SrNotificationVolume25MbWritten:
g_pEventHandler->OnSize_Notification(szVolumeGuid,
pSROverlapped->m_pRecord->Context);
break;
case SrNotificationVolumeError:
g_pEventHandler->OnVolumeError_Notification(szVolumeGuid,
pSROverlapped->m_pRecord->Context);
break;
default:
trace(0, "Unknown notification");
ASSERT(0);
break;
}
// check for stop signal
ASSERT(g_pSRConfig);
if (IsStopSignalled(g_pSRConfig->m_hSRStopEvent))
goto done;
// re-submit the ioctl to the driver
memset( &pSROverlapped->m_overlapped, 0, sizeof(OVERLAPPED) );
pSROverlapped->m_dwRecordLength = sizeof(SR_NOTIFICATION_RECORD)
+ (SR_MAX_FILENAME_LENGTH*sizeof(WCHAR));
memset( pSROverlapped->m_pRecord, 0, pSROverlapped->m_dwRecordLength);
pSROverlapped->m_hDriver = g_pSRConfig->GetFilter();
uError = SrWaitForNotification( pSROverlapped->m_hDriver,
pSROverlapped->m_pRecord ,
pSROverlapped->m_dwRecordLength,
(LPOVERLAPPED) pSROverlapped );
if ( uError != 0 && uError != ERROR_IO_PENDING )
{
trace(0, "! SrWaitForNotification : %ld", uError);
goto done;
}
fResubmit = TRUE;
done:
// if we didn't resubmit, there is one less io request pending
if (FALSE == fResubmit && g_pEventHandler != NULL)
g_pEventHandler->GetCounter()->Down();
tleave();
return;
}
// first write notification handler
// this will be sent when the first monitored op happens on a new drive
// or a newly created restore point
// RESPONSE: update the drive table to indicate that this is a new drive
// and/or that this drive is a participant in this restore point
void
CEventHandler::OnFirstWrite_Notification(LPWSTR pszGuid)
{
DWORD dwRc = ERROR_SUCCESS;
WCHAR szMount[MAX_PATH];
BOOL fHaveLock;
CDataStore *pdsNew = NULL, *pds=NULL;
tenter("CEventHandler::OnFirstWrite_Notification");
trace(0, "First write on %S", pszGuid);
LOCKORLEAVE(fHaveLock);
ASSERT(g_pDataStoreMgr);
ASSERT(g_pSRConfig);
dwRc = g_pDataStoreMgr->GetDriveTable()->FindMountPoint(pszGuid, szMount);
if (ERROR_BAD_PATHNAME == dwRc)
{
// the mountpoint path is too long for us to support
// so disable the filter on this volume
CDataStore ds(NULL);
ds.LoadDataStore(NULL, pszGuid, NULL, 0, 0, 0);
dwRc = SrDisableVolume(g_pSRConfig->GetFilter(), ds.GetNTName());
if (dwRc != ERROR_SUCCESS)
{
trace(0, "! SrDisableVolume : %ld", dwRc);
}
else
{
WCHAR wcsPath[MAX_PATH];
MakeRestorePath (wcsPath, pszGuid, L"");
// delete the restore directory
dwRc = Delnode_Recurse (wcsPath, TRUE,
g_pDataStoreMgr->GetStopFlag());
if (dwRc != ERROR_SUCCESS)
{
trace(0, "! Delnode_Recurse : %ld", dwRc);
}
trace(0, "Mountpoint too long - disabled volume %S", pszGuid);
}
goto done;
}
if (ERROR_SUCCESS != dwRc)
{
trace(0, "! FindMountPoint on %S : %ld", pszGuid, dwRc);
goto done;
}
pdsNew = g_pDataStoreMgr->GetDriveTable()->FindDriveInTable(pszGuid);
dwRc = g_pDataStoreMgr->GetDriveTable()->AddDriveToTable(szMount, pszGuid);
if (ERROR_SUCCESS != dwRc)
{
trace(0, "! AddDriveToTable on %S", pszGuid);
goto done;
}
if (ERROR_SUCCESS != g_pDataStoreMgr->SetDriveParticipation (pszGuid, TRUE))
trace(0, "! SetDriveParticipation on %S", pszGuid);
//
// if less than 50mb free, or if SR is already frozen, then freeze
//
pds = g_pDataStoreMgr->GetDriveTable()->FindDriveInTable(pszGuid);
if (pds)
{
// update the active bit too
pds->SetActive(TRUE);
// then check diskfree
pds->UpdateDiskFree(NULL);
if ( (pds->GetDiskFree() <= THRESHOLD_FREEZE_DISKSPACE * MEGABYTE) ||
(g_pDataStoreMgr->IsDriveFrozen(g_pSRConfig->GetSystemDrive())) )
{
g_pDataStoreMgr->FreezeDrive(pszGuid);
}
}
else
{
//
// we just added the drive, so should never get here
//
ASSERT(0);
}
done:
UNLOCK(fHaveLock);
tleave();
return;
}
// 25MB notification handler
// this will be sent when the filter has copied 25MB of data to the datastore
// on some drive
// RESPONSE: update the datastore size and check fifo conditions
void
CEventHandler::OnSize_Notification(LPWSTR pszGuid, ULONG ulRp)
{
tenter("CEventHandler::OnSize_Notification");
int nPercent = 0;
BOOL fHaveLock;
DWORD dwRc = ERROR_SUCCESS;
LOCKORLEAVE(fHaveLock);
trace(0, "25mb copied on drive %S", pszGuid);
trace(0, "for RP%ld", ulRp);
if ((DWORD) ulRp != m_CurRp.GetNum())
{
trace(0, "This is an obsolete notification");
goto done;
}
ASSERT(g_pDataStoreMgr);
g_pDataStoreMgr->UpdateDataStoreUsage(pszGuid, SR_NOTIFY_BYTE_COUNT);
if ( ERROR_SUCCESS == g_pDataStoreMgr->GetUsagePercent(pszGuid, &nPercent)
&& nPercent >= THRESHOLD_FIFO_PERCENT )
{
OnFifo(pszGuid,
0, // no target rp
TARGET_FIFO_PERCENT, // target percent
TRUE, // fifo current rp if necessary (freeze)
FALSE);
}
done:
UNLOCK(fHaveLock);
tleave();
return;
}
// disk full notification handler
// this will be sent when the filter encounters an error on a volume
// ideally, this should never be sent
// if diskfull, freeze SR on this drive
// else disable SR on this drive
void
CEventHandler::OnVolumeError_Notification(LPWSTR pszGuid, ULONG ulError)
{
tenter("CEventHandler::OnVolumeError_Notification");
BOOL fHaveLock;
DWORD dwRc = ERROR_SUCCESS;
LOCKORLEAVE(fHaveLock);
trace(0, "Volume Error on %S", pszGuid);
trace(0, "Error : %ld", ulError);
ASSERT(g_pDataStoreMgr);
ASSERT(g_pSRConfig);
if (ulError == ERROR_DISK_FULL)
{
// no more disk space - freeze
// NOTE: we don't check to see if the drive is already
// frozen here. If for some reason we are out of sync with
// the driver, this will fix it
g_pDataStoreMgr->FreezeDrive(pszGuid);
}
else
{
// fifo all restore points prior to the current one
dwRc = g_pDataStoreMgr->Fifo(g_pSRConfig->GetSystemDrive(), 0, 0, FALSE, FALSE);
if (dwRc != ERROR_SUCCESS)
{
trace(0, "! Fifo : %ld", dwRc);
}
// make the current rp a cancelled rp
// so that UI will not display it
if (! m_fNoRpOnSystem)
{
SRRemoveRestorePointS(m_CurRp.GetNum());
// m_CurRp.Cancel();
}
// log the error in the drivetable
dwRc = g_pDataStoreMgr->SetDriveError(pszGuid);
if (dwRc != ERROR_SUCCESS)
{
trace(0, "! SetDriveError : %ld", dwRc);
}
}
done:
UNLOCK(fHaveLock);
tleave();
return;
}
// disk space notifications sent by the shell
DWORD WINAPI
OnDiskFree_200(PVOID pszDrive)
{
// thaw
ASSERT(g_pEventHandler);
(g_pEventHandler->GetCounter())->Down();
return 0;
}
DWORD WINAPI
OnDiskFree_80(PVOID pszDrive)
{
// fifo
ASSERT(g_pEventHandler);
g_pEventHandler->OnFifo((LPWSTR) pszDrive,
0, // no target rp
TARGET_FIFO_PERCENT, // target percent
TRUE, // fifo current rp if necessary (freeze)
TRUE); // fifo atleast one restore point
(g_pEventHandler->GetCounter())->Down();
return 0;
}
DWORD WINAPI
OnDiskFree_50(PVOID pszDrive)
{
TENTER("OnDiskFree_50");
DWORD dwRc = ERROR_SUCCESS;
// freeze
ASSERT(g_pEventHandler);
ASSERT(g_pDataStoreMgr);
//
// check if there is some rp directory
// if none, then don't bother
//
CRestorePointEnum *prpe = new CRestorePointEnum((LPWSTR) pszDrive, FALSE, FALSE); // backward, include current
CRestorePoint *prp = new CRestorePoint;
if (!prpe || !prp)
{
trace(0, "Cannot allocate memory for restore point enum");
goto done;
}
dwRc = prpe->FindFirstRestorePoint(*prp);
if (dwRc == ERROR_SUCCESS || dwRc == ERROR_FILE_NOT_FOUND)
{
g_pEventHandler->OnFreeze((LPWSTR) pszDrive);
}
else
{
trace(0, "Nothing in datastore -- so not freezing");
}
if (prpe)
delete prpe;
if (prp)
delete prp;
(g_pEventHandler->GetCounter())->Down();
done:
TLEAVE();
return 0;
}
// stop event management
void
CEventHandler::SignalStop()
{
if ( g_pSRConfig )
{
SetEvent( g_pSRConfig->m_hSRStopEvent );
}
}
DWORD
CEventHandler::WaitForStop()
{
if ( g_pSRConfig )
{
WaitForSingleObject( g_pSRConfig->m_hSRStopEvent, INFINITE );
return g_pSRConfig->GetResetFlag() ? ERROR_NO_SHUTDOWN_IN_PROGRESS : ERROR_SHUTDOWN_IN_PROGRESS;
}
else
return ERROR_INTERNAL_ERROR;
}
//
// perform idle tasks
//
DWORD
CEventHandler::OnIdle()
{
DWORD dwThawStatus = ERROR_NO_MORE_ITEMS;
DWORD dwRc = ERROR_NO_MORE_ITEMS;
BOOL fCreateAuto = FALSE;
ULARGE_INTEGER *pulFreeze = NULL;
tenter("CEventHandler::OnIdle");
trace(0, "Idleness detected");
ASSERT(g_pSRConfig);
ASSERT(g_pDataStoreMgr);
//
// check thaw timer to see if
// there are frozen drives
//
pulFreeze = (ULARGE_INTEGER *) &m_ftFreeze;
if (pulFreeze->QuadPart != 0)
{
FILETIME ftNow;
ULARGE_INTEGER *pulNow;
GetSystemTimeAsFileTime(&ftNow);
pulNow = (ULARGE_INTEGER *) &ftNow;
//
// if more than 15 minutes since freeze happened
// try to thaw
//
if (pulNow->QuadPart - pulFreeze->QuadPart >=
((INT64) g_pSRConfig->m_dwThawInterval * 1000 * 1000 * 10))
{
dwThawStatus = g_pDataStoreMgr->ThawDrives(TRUE);
if (dwThawStatus != ERROR_SUCCESS)
{
trace(0, "Cannot thaw drives yet");
}
}
}
else
{
fCreateAuto = IsTimeForAutoRp();
}
// make periodic checkpoint if it is time to make an auto-rp or
// time to thaw drives or
// a volume error happened in the previous session
if ( dwThawStatus == ERROR_SUCCESS ||
fCreateAuto == TRUE ||
m_fCreateRpASAP == TRUE )
{
RESTOREPOINTINFO RPInfo;
STATEMGRSTATUS SmgrStatus;
RPInfo.dwEventType = BEGIN_SYSTEM_CHANGE;
RPInfo.dwRestorePtType = m_fNoRpOnSystem ? FIRSTRUN : CHECKPOINT;
if (ERROR_SUCCESS != SRLoadString(L"srrstr.dll", IDS_SYSTEM_CHECKPOINT_TEXT, RPInfo.szDescription, MAX_PATH))
{
lstrcpy(RPInfo.szDescription, s_cszSystemCheckpointName);
}
SRSetRestorePointS(&RPInfo, &SmgrStatus);
dwRc = SmgrStatus.nStatus;
if (dwRc != ERROR_SUCCESS)
goto done;
m_fCreateRpASAP = FALSE;
// we made a restore point and perhaps thawed some drives
// let's not push it any further
// compress on next idle opportunity
}
else
{
// if system is running on battery
// skip these tasks
if (g_pSRConfig->IsSystemOnBattery())
{
trace(0, "System on battery -- skipping idle tasks");
goto done;
}
// fifo restore points older than a specified age
// if the fifo age is set to 0, that means this feature
// is turned off
if (g_pSRConfig->m_dwRPLifeInterval > 0)
{
g_pDataStoreMgr->FifoOldRps(g_pSRConfig->m_dwRPLifeInterval);
}
// compress backed up files - pick any drive
dwRc = OnCompress( NULL );
//
// if we have more to compress, request idle again
//
if (dwRc == ERROR_OPERATION_ABORTED)
{
SetEvent(g_pSRConfig->m_hIdleRequestEvent);
}
}
done:
tleave();
return dwRc;
}
extern "C" void CALLBACK
IdleRequestCallback(PVOID pContext, BOOLEAN fTimerFired)
{
BOOL fRegistered = FALSE;
HANDLE *pWaitHandle = NULL;
DWORD dwErr = ERROR_SUCCESS;
BOOL fHaveLock = FALSE;
tenter("CEventHandler::IdleRequestCallback");
ASSERT(g_pEventHandler);
ASSERT(g_pSRConfig);
if (g_pEventHandler == NULL || g_pSRConfig == NULL)
{
trace(0, "global is Null");
goto Err;
}
fHaveLock = g_pEventHandler->GetLock()->Lock(CLock::TIMEOUT);
if (! fHaveLock)
{
trace(0, "Cannot get lock");
goto Err;
}
//
// first off, if the stop event is triggered
// and we are here for some reason,
// bail blindly
//
if (IsStopSignalled(g_pSRConfig->m_hSRStopEvent))
{
trace(0, "Stop event signalled - bailing out of idle");
goto Err;
}
//
// idleness is requested or timer fired
// re-register for idle again
//
if (fTimerFired)
trace(0, "Timed out");
else
trace(0, "Idle request event received");
//
// if already registered for idle
// then do nothing
//
if (g_pEventHandler->m_hIdleStartHandle != NULL)
{
trace(0, "Already registered for idle");
goto Err;
}
dwErr = RegisterIdleTask(ItSystemRestoreIdleTaskId,
&(g_pSRConfig->m_hIdle),
&(g_pSRConfig->m_hIdleStartEvent),
&(g_pSRConfig->m_hIdleStopEvent));
if (dwErr != ERROR_SUCCESS)
{
trace(0, "! RegisterIdleTask : %ld", dwErr);
}
else
{
trace(0, "Registered for idle");
//
// register idle callback
//
if (FALSE == RegisterWaitForSingleObject(&g_pEventHandler->m_hIdleStartHandle,
g_pSRConfig->m_hIdleStartEvent,
(WAITORTIMERCALLBACK) IdleStartCallback,
NULL,
INFINITE,
WT_EXECUTEDEFAULT | WT_EXECUTEONLYONCE))
{
dwErr = GetLastError();
trace(0, "! RegisterWaitForSingleObject for startidle: %ld", dwErr);
goto Err;
}
if (FALSE == RegisterWaitForSingleObject(&g_pEventHandler->m_hIdleStopHandle,
g_pSRConfig->m_hIdleStopEvent,
(WAITORTIMERCALLBACK) IdleStopCallback,
NULL,
INFINITE,
WT_EXECUTEDEFAULT | WT_EXECUTEONLYONCE))
{
dwErr = GetLastError();
trace(0, "! RegisterWaitForSingleObject for stopidle: %ld", dwErr);
goto Err;
}
}
Err:
if (g_pEventHandler)
{
if (fHaveLock)
g_pEventHandler->GetLock()->Unlock();
}
return;
}
extern "C" void CALLBACK
IdleStartCallback(PVOID pContext, BOOLEAN fTimerFired)
{
DWORD dwErr = ERROR_SUCCESS;
BOOL fHaveLock = FALSE;
tenter("CEventHandler::IdleStartCallback");
ASSERT(g_pEventHandler);
ASSERT(g_pSRConfig);
if (g_pEventHandler == NULL || g_pSRConfig == NULL)
{
trace(0, "global is Null");
goto Err;
}
fHaveLock = g_pEventHandler->GetLock()->Lock(CLock::TIMEOUT);
if (! fHaveLock)
{
trace(0, "Cannot get lock");
goto Err;
}
//
// first off, if the stop event is triggered
// and we are here for some reason,
// bail blindly
//
if (IsStopSignalled(g_pSRConfig->m_hSRStopEvent))
{
trace(0, "Stop event signalled - bailing out of idle");
goto Err;
}
//
// idleness occurred
//
trace(0, "fTimerFired = %d", fTimerFired);
g_pEventHandler->OnIdle();
dwErr = UnregisterIdleTask(g_pSRConfig->m_hIdle,
g_pSRConfig->m_hIdleStartEvent,
g_pSRConfig->m_hIdleStopEvent);
if (dwErr != ERROR_SUCCESS)
{
trace(0, "! UnregisterIdleTask : %ld", dwErr);
}
else
{
trace(0, "Unregistered from idle");
}
//
// we are done - record this
// since we registered for this callback only once,
// we don't have to call UnregisterWait on this handle -
// or so I hope
//
g_pEventHandler->m_hIdleStartHandle = NULL;
Err:
if (g_pEventHandler)
{
if (fHaveLock)
g_pEventHandler->GetLock()->Unlock();
}
return;
}
extern "C" void CALLBACK
IdleStopCallback(PVOID pContext, BOOLEAN fTimerFired)
{
tenter("IdleStopCallback");
BOOL fHaveLock = FALSE;
if (g_pEventHandler == NULL)
{
trace(0, "global is Null");
goto Err;
}
fHaveLock = g_pEventHandler->GetLock()->Lock(CLock::TIMEOUT);
if (! fHaveLock)
{
trace(0, "Cannot get lock");
goto Err;
}
trace(0, "Idle Stop event signalled");
g_pEventHandler->m_hIdleStopHandle = NULL;
Err:
if (g_pEventHandler)
{
if (fHaveLock)
g_pEventHandler->GetLock()->Unlock();
}
tleave();
}
// set up timer
DWORD
CEventHandler::InitTimer()
{
DWORD dwRc = ERROR_SUCCESS;
tenter("CEventHandler::InitTimer");
ASSERT(g_pSRConfig);
//
// if the timer interval is specified as 0,
// then don't create timer
//
if (g_pSRConfig->m_dwTimerInterval == 0)
{
trace(0, "Not starting timer");
goto done;
}
m_hTimerQueue = CreateTimerQueue();
if (! m_hTimerQueue)
{
dwRc = GetLastError();
trace(0, " ! CreateTimerQueue : %ld", dwRc);
goto done;
}
if (FALSE == CreateTimerQueueTimer(&m_hTimer,
m_hTimerQueue,
TimerCallback,
NULL,
g_pSRConfig->m_dwTimerInterval * 1000, // milliseconds
g_pSRConfig->m_dwTimerInterval * 1000, // periodic
WT_EXECUTEINIOTHREAD))
{
dwRc = GetLastError();
trace(0, "! CreateTimerQueueTimer : %ld", dwRc);
goto done;
}
trace(0, "SRBoottask: Timer started");
done:
tleave();
return dwRc;
}
// end timer
BOOL
CEventHandler::EndTimer()
{
DWORD dwRc;
BOOL fRc = TRUE;
tenter("CEventHandler::EndTimer");
if ( ! m_hTimerQueue )
{
trace(0 , "! m_hTimerQueue = NULL");
goto done;
}
// delete timer queue should wait for current timer tasks to end
if (FALSE == (fRc = DeleteTimerQueueEx( m_hTimerQueue, INVALID_HANDLE_VALUE )))
{
trace(0, "! DeleteTimerQueueEx : %ld", GetLastError());
}
m_hTimerQueue = NULL;
m_hTimer = NULL;
done:
tleave( );
return fRc;
}
BOOL
CEventHandler::IsTimeForAutoRp()
{
tenter("CEventHandler::IsTimeForAutoRp");
FILETIME *pftRp, ftNow;
ULARGE_INTEGER *pulRp, *pulNow;
BOOL fRc = FALSE;
INT64 llInterval, llSession;
ASSERT(g_pSRConfig && g_pDataStoreMgr);
if (m_fNoRpOnSystem)
{
// if SR is frozen, we will create a restore point via the thaw codepath in OnIdle
// we will get here ONLY if we get idle time before we have created the firstrun checkpoint -
// we won't create an idle checkpoint before the firstrun checkpoint if we have a Run key waiting
// to create one
HKEY hKey;
DWORD dwRet = RegOpenKey(HKEY_LOCAL_MACHINE,
L"Software\\Microsoft\\Windows\\CurrentVersion\\Run",
&hKey);
if (dwRet == ERROR_SUCCESS)
{
dwRet = RegQueryValueEx(hKey, L"SRFirstRun", NULL, NULL, NULL, NULL);
RegCloseKey(hKey);
}
if (dwRet == ERROR_SUCCESS)
{
trace(0, "Run entry exists to create firstrun checkpoint - not creating idle checkpoint");
fRc = FALSE;
goto done;
}
else
{
fRc = TRUE;
goto done;
}
}
// get the last restore point creation time and the current time
pftRp = m_CurRp.GetTime();
GetSystemTimeAsFileTime(&ftNow);
pulRp = (ULARGE_INTEGER *) pftRp;
pulNow = (ULARGE_INTEGER *) &ftNow;
// check the last restore point time with current time
// if the difference is greater than GlobalInterval, it's time to make a new one
// all comparisions in filetime units - i.e. 100's of nanoseconds
// if GlobalInterval is 0, this is turned off
llInterval = (INT64) g_pSRConfig->m_dwRPGlobalInterval * 10 * 1000 * 1000;
if ( llInterval > 0 &&
pulNow->QuadPart - pulRp->QuadPart >= llInterval )
{
trace(0, "24 hrs elapsed since last restore point");
fRc = TRUE;
goto done;
}
// if the last restore point was more than 10hrs ago,
// and the current session began more than 10hrs ago,
// then we haven't made a restore point for the last 10hrs in the current session
// again, it's time to make a new one
// this will ensure that we keep making checkpoints every 10hrs of session time,
// idleness permitting
// if SessionInterval is 0, this is turned off
// if system is on battery, skip creating session rp
if (g_pSRConfig->IsSystemOnBattery())
{
trace(0, "System on battery -- skipping session rp check");
goto done;
}
llSession = (INT64) GetTickCount() * 10 * 1000;
llInterval = (INT64) g_pSRConfig->m_dwRPSessionInterval * 10 * 1000 * 1000;
if ( llInterval > 0 &&
llSession >= llInterval &&
pulNow->QuadPart - pulRp->QuadPart >= llInterval )
{
trace(0, "10 hrs elapsed in current session since last restore point");
fRc = TRUE;
goto done;
}
// if we reach here, no restore point needs to be created now
// fRc is already FALSE
done:
tleave();
return fRc;
}
void
CEventHandler::RefreshCurrentRp(BOOL fScanAllDrives)
{
tenter("CEventHandler::RefreshCurrentRp");
DWORD dwErr;
SDriveTableEnumContext dtec = {NULL, 0};
CDataStore *pds = NULL;
ASSERT(g_pSRConfig && g_pDataStoreMgr);
//
// get the most recent valid restore point
// cancelled restore points are considered valid as well
// if rp.log is missing, we will enumerate back up to the point where it exists
// and consider that the most recent restore point
//
CRestorePointEnum *prpe = new CRestorePointEnum(g_pSRConfig->GetSystemDrive(), FALSE, FALSE);
if (!prpe)
{
trace(0, "Cannot allocate memory for restore point enum");
goto done;
}
dwErr = prpe->FindFirstRestorePoint(m_CurRp);
while (dwErr == ERROR_FILE_NOT_FOUND)
{
fScanAllDrives = FALSE;
dwErr = prpe->FindNextRestorePoint(m_CurRp);
}
if (dwErr == ERROR_SUCCESS)
{
trace(0, "Current Restore Point: %S", m_CurRp.GetDir());
m_fNoRpOnSystem = FALSE;
// update the participate bits on each datastore -
// we need to do this every time we come up
// because we might have missed filter firstwrite
// notifications
if (fScanAllDrives)
{
dwErr = g_pDataStoreMgr->UpdateDriveParticipation(NULL, m_CurRp.GetDir());
if (dwErr != ERROR_SUCCESS)
{
trace(0, "UpdateDriveParticipation : %ld", dwErr);
}
}
}
else
{
trace(0, "No live restore points on system");
m_fNoRpOnSystem = TRUE;
}
//
// if any drive is newly frozen,
// record freeze time
//
if (m_ftFreeze.dwLowDateTime == 0 &&
m_ftFreeze.dwHighDateTime == 0 &&
g_pDataStoreMgr->IsDriveFrozen(NULL))
{
GetSystemTimeAsFileTime(&m_ftFreeze);
}
else // not frozen
{
m_ftFreeze.dwLowDateTime = 0;
m_ftFreeze.dwHighDateTime = 0;
}
prpe->FindClose ();
delete prpe;
done:
tleave();
}
// queue a work item to a thread from the thread pool
// keep a count of all such queued items
DWORD
CEventHandler::QueueWorkItem(WORKITEMFUNC pFunc, PVOID pv)
{
m_Counter.Up();
if (! QueueUserWorkItem(pFunc, pv, WT_EXECUTELONGFUNCTION))
m_Counter.Down();
return GetLastError();
}
// CALLBACK functions
// calls through to eventhandler methods
// timer
extern "C" void CALLBACK
TimerCallback(
PVOID lpParam,
BOOLEAN fTimeout)
{
if ( g_pEventHandler )
g_pEventHandler->OnTimer( lpParam, fTimeout );
}
Reference in a new issue Copy permalink