path: root/private/eventlog/server/eventlog.c

/*++

Copyright (c) 1990  Microsoft Corporation

Module Name:

    EVENTLOG.C

Abstract:

    This file contains the main routines for the NT OS/2 Event
    Logging Service.

Author:

    Rajen Shah  (rajens)    1-Jul-1991

[Environment:]

    User Mode - Win32, except for NTSTATUS returned by some functions.

Revision History:

    26-Jan-1994     Danl
        SetUpModules:  Fixed memory leak where the buffers for the enumerated
        key names were never free'd.  Also fixed problem where the size of
        the MULTI_SZ buffer used for the "Sources" key was calculated by
        using the names in the registry, while the copying was done
        using the names in the module list.  When registry keys are deleted,
        the module list entry is retained until the next boot.  Since the
        module list is larger, it would overwrite the MULTI_SZ buffer.
    1-Nov-1993      Danl
        Make Eventlog service a DLL and attach it to services.exe.
        Pass in GlobalData to Elfmain.  This GlobalData structure contains
        all well-known SIDs and pointers to the Rpc Server (Start & Stop)
        routines.  Get rid of the service process main function.
    1-Jul-1991      RajenS
        created

--*/

//
// INCLUDES
//

#include <eventp.h>
#include <ntrpcp.h>
#include <elfcfg.h>
#include <string.h>
#include <stdlib.h>   // getenv()
#include <tstr.h>     // WCSSIZE
#include <alertmsg.h> // ALERT_ELF manifests
#include <stdio.h>    // printf

#ifdef _CAIRO_
#include <elfextrn.h>
#endif // _CAIRO_

//
// Bit Flags used for Progress Reporting in SetupDataStruct().
//
#define LOGFILE_OPENED  0x00000001
#define MODULE_LINKED   0x00000002
#define LOGFILE_LINKED  0x00000004

//
// Local Function Prorotypes
//
VOID
ElfInitMessageBoxTitle(
    VOID
    );


NTSTATUS
ElfStartRPCServer ()

/*++

Routine Description:


Arguments:



Return Value:

    NONE

Note:


--*/
{
    NTSTATUS    Status;


    ElfDbgPrint(("[ELF] Starting RPC server.\n"));

    Status = RpcpAddInterface (
                    wname_Eventlogsvc,
                    eventlog_ServerIfHandle
                    );

    if (Status != NERR_Success) {
        ElfDbgPrintNC(("[ELF] RpcpAddInterface = %u\n", Status ));

    }
    return (I_RpcMapWin32Status(Status));            // Return status to caller

}


NTSTATUS
SetUpDataStruct (
        PUNICODE_STRING     LogFileName,
        ULONG               MaxFileSize,
        ULONG               Retention,
        ULONG               GuestAccessRestriction,
        PUNICODE_STRING     ModuleName,
        HANDLE              hLogFile,
        ELF_LOG_TYPE        LogType
    )

/*++

Routine Description:

    This routine sets up the information for one module. It is called from
    ElfSetUpConfigDataStructs for each module to be configured.

    Module information is passed into this routine and a LOGMODULE structure
    is created for it.  If the logfile associated with this module doesn't
    exist, a LOGFILE structure is created for it, and added to the linked
    list of LOGFILE structures.  The LOGMODULE is associated with the LOGFILE,
    and it is added to the linked list of LOGMODULE structures.  The logfile
    is opened and mapped to memory.

    Finally, at the end, this function calls SetUpModules, which looks at
    all the subkeys in the registry under this logfile, and adds any new ones
    to the linked list, and updates the Sources MULTI_SZ for the event viewer.

Arguments:

    LogFileName - Name of log file for this module.  If this routine needs
        a copy of this name it will make one, so that the caller can free
        the name afterwards if that is desired.

    MaxFileSize - Max size of the log file.
    Retention   - Max retention for the file.
    ModuleName  - Name of module that this file is associated with.
    RegistryHandle - Handle to the root node for this LogFile's info
                     in the registry.  This is used to enumerate all the
                     modules under this key.

Return Value:

    Pointer to Module structure that is allocated in this routine.
    NTSTATUS

Note:


--*/
{
    NTSTATUS        Status = STATUS_SUCCESS;
    PLOGFILE        pLogFile=NULL;
    PLOGMODULE      pModule=NULL;
    ANSI_STRING     ModuleNameA;
    DWORD           Type;
    BOOL            bLogFileAllocatedHere=FALSE;
    PUNICODE_STRING SavedBackupFileName=NULL;
    DWORD           StringLength;
    PLOGMODULE      OldDefaultLogModule=NULL;
    DWORD           Progress = 0L;

    //
    // Argument check.
    //

    if ((LogFileName == NULL)         ||
        (LogFileName->Buffer == NULL) ||
        (ModuleName == NULL))
    {
        return(STATUS_INVALID_PARAMETER);
    }

    // If the default log file for a module is also being used by another
    // module, then we just link that same file structure with the other
    // module.
    //
    // Truncate the maximum size of the log file to a 4K boundary.
    // This is to allow for page granularity.
    //

    pLogFile = FindLogFileFromName (LogFileName);

    pModule  = ElfpAllocateBuffer (sizeof (LOGMODULE) );
    if (pModule == NULL) {
        return(STATUS_NO_MEMORY);
    }

    if (pLogFile == NULL) {

        //--------------------------------------
        // CREATE A NEW LOGFILE !!
        //--------------------------------------
        // A logfile by this name doesn't exist yet.  So we will create
        // one so that we can add the module to it.
        //

        bLogFileAllocatedHere = TRUE;

        pLogFile = ElfpAllocateBuffer (sizeof (LOGFILE) );

        if (pLogFile == NULL) {
            ElfpFreeBuffer (pModule);
            return(STATUS_NO_MEMORY);
        }

        ElfDbgPrint(("[ELF] Set up file data\n"));

        //
        // Allocate a new LogFileName that can be attached to the
        // new pLogFile structure.
        //
        StringLength = LogFileName->Length + sizeof(WCHAR);
        SavedBackupFileName = (PUNICODE_STRING) ElfpAllocateBuffer(
            sizeof(UNICODE_STRING) + StringLength);

        if (SavedBackupFileName == NULL) {
            Status = STATUS_NO_MEMORY;
            goto ErrorExit;
        }

        SavedBackupFileName->Buffer = (LPWSTR)((LPBYTE) SavedBackupFileName +
            sizeof(UNICODE_STRING));

        SavedBackupFileName->Length = LogFileName->Length;
        SavedBackupFileName->MaximumLength = (USHORT) StringLength;
        RtlMoveMemory(SavedBackupFileName->Buffer, LogFileName->Buffer,
            LogFileName->Length);
        SavedBackupFileName->Buffer[SavedBackupFileName->Length / sizeof(WCHAR)] =
            L'\0';

        //
        // This is the first user - RefCount gets incrememted below
        //
        pLogFile->RefCount = 0;
        pLogFile->FileHandle = NULL;
        pLogFile->LogFileName = SavedBackupFileName;
        pLogFile->ConfigMaxFileSize = ELFFILESIZE(MaxFileSize);
        pLogFile->Retention = Retention;


        //
        // Save away the default module name for this file
        //
        pLogFile->LogModuleName = ElfpAllocateBuffer(
            sizeof(UNICODE_STRING) + ModuleName->MaximumLength);

        if (pLogFile->LogModuleName == NULL) {
            Status = STATUS_NO_MEMORY;
            goto ErrorExit;
        }

        pLogFile->LogModuleName->MaximumLength = ModuleName->MaximumLength;
        pLogFile->LogModuleName->Buffer =
            (LPWSTR)(pLogFile->LogModuleName + 1);
        RtlCopyUnicodeString(pLogFile->LogModuleName, ModuleName);

        InitializeListHead (&pLogFile->Notifiees);


        pLogFile->NextClearMaxFileSize = pLogFile->ConfigMaxFileSize;

        RtlInitializeResource ( &pLogFile->Resource );
        LinkLogFile ( pLogFile );   // Link it in

        Progress |= LOGFILE_LINKED;

    } // endif (pLogfile == NULL)

    //--------------------------------------
    // ADD THE MODULE TO THE LOG MODULE LIST
    //--------------------------------------
    // Set up the module data structure for the default (which is
    // the same as the logfile keyname).
    //

    pLogFile->RefCount++;
    pModule->LogFile = pLogFile;
    pModule->ModuleName = (LPWSTR) ModuleName->Buffer;

    Status = RtlUnicodeStringToAnsiString (
                    &ModuleNameA,
                    ModuleName,
                    TRUE
                    );

    if (!NT_SUCCESS(Status)) {
        pLogFile->RefCount--;
        goto ErrorExit;
    }

    //
    // Link the new module in.
    //

    LinkLogModule(pModule, &ModuleNameA);

    RtlFreeAnsiString (&ModuleNameA);

    Progress |= MODULE_LINKED;

    //
    // Open up the file and map it to memory.  Impersonate the
    // caller so we can use UNC names
    //

    if (LogType == ElfBackupLog) ElfImpersonateClient();

    Status = ElfOpenLogFile (pLogFile, LogType);

    if (LogType == ElfBackupLog) ElfRevertToSelf();

    if (!NT_SUCCESS(Status)) {

        ElfDbgPrintNC(("[ELF] Couldn't open %ws for module %ws\n",
            LogFileName->Buffer, ModuleName->Buffer));

        if (LogType != ElfBackupLog) {
            ElfpCreateQueuedAlert(ALERT_ELF_LogFileNotOpened, 1,
                &(ModuleName->Buffer));
        }
        pLogFile->RefCount--;
        goto ErrorExit;
    }

    Progress |= LOGFILE_OPENED;
    //
    // If this is the application module, remember the pointer
    // to use if a module doesn't have an entry in the registry
    //

    if (!_wcsicmp(ModuleName->Buffer, ELF_DEFAULT_MODULE_NAME)) {
        OldDefaultLogModule = ElfDefaultLogModule;
        ElfDefaultLogModule = pModule;
    }

    //
    // Create the security descriptor for this logfile.  Only
    // the system and security modules are secured against
    // reads and writes by world.
    //

    if (!_wcsicmp(ModuleName->Buffer, ELF_SYSTEM_MODULE_NAME)) {
        Type = ELF_LOGFILE_SYSTEM;
    }
    else if (!_wcsicmp(ModuleName->Buffer, ELF_SECURITY_MODULE_NAME)) {
        Type = ELF_LOGFILE_SECURITY;
    }
    else {
        Type = ELF_LOGFILE_APPLICATION;
    }

    //
    // Create a Security Descriptor for this Logfile
    //   (RtlDeleteSecurityObject() can be used to free
    //    pLogFile->Sd).
    //
    Status = ElfpCreateLogFileObject(pLogFile, Type, GuestAccessRestriction);
    if (!NT_SUCCESS(Status)) {
        ElfDbgPrintNC(("[ELF] Could not create the security "
            "descriptor for logfile %ws\n", ModuleName->Buffer));

        pLogFile->RefCount--;
        goto ErrorExit;
    }

    //
    // Now that we've added the default module name, see if there are any
    // modules configured to log to this file, and if so, create the module
    // structures for them.
    //

    SetUpModules(hLogFile, pLogFile, FALSE);

    return (STATUS_SUCCESS);

ErrorExit:

    if (Progress & LOGFILE_OPENED) {
        ElfpCloseLogFile(pLogFile, ELF_LOG_CLOSE_BACKUP);
    }

    if (Progress & MODULE_LINKED) {
        UnlinkLogModule(pModule);
        DeleteAtom(pModule->ModuleAtom);
    }

    if (bLogFileAllocatedHere) {

        if (Progress & LOGFILE_LINKED) {
            UnlinkLogFile(pLogFile);
            RtlDeleteResource (&pLogFile->Resource);
        }
        if (pLogFile->LogModuleName != NULL) {
            ElfpFreeBuffer(pLogFile->LogModuleName);
        }
        if (SavedBackupFileName != NULL) {
            ElfpFreeBuffer(SavedBackupFileName);
        }
        if (pLogFile != NULL) {
            ElfpFreeBuffer(pLogFile);
        }
    }

    ElfpFreeBuffer(pModule);

    if (OldDefaultLogModule != NULL) {
        ElfDefaultLogModule = OldDefaultLogModule;
    }
    return(Status);
}

NTSTATUS
SetUpModules (
        HANDLE              hLogFile,
        PLOGFILE            pLogFile,
        BOOLEAN             bAllowDupes
    )

/*++

Routine Description:

    This routine sets up the information for all modules for a logfile.

    The subkeys under a logfile in the eventlog portion of the registry
    are enumerated.  For each unique subkey, a LOGMODULE structure is
    created.  Each new structures is added to a linked list
    of modules for that logfile.

    If there was one or more unique subkeys, meaning the list has changed
    since we last looked, then we go through the entire linked list of
    log modules, and create a MULTI_SZ list of all the modules.  This list
    is stored in the Sources value for that logfile for the event viewer
    to use.

    BUGBUG:
    NOTE:  A module is never un-linked from the linked list of log modules
    even if the registry subkey for it is removed.  This should probably
    be done sometime.  It would make the eventlog more robust.

Arguments:

    hLogFile    - Registry key for the Log File node
    pLogFile    - pointer to the log file structure
    bAllowDupes - If true, it's ok to already have a module with the same
                  name (used when processing change notify of registry)

Return Value:

    NTSTATUS - If unsuccessful, it is not a fatal error.

        Even if this status is unsuccessful, me may have been able
        to store some of the new subkeys in the LogModule list.  Also, we
        may have been able to update the Sources MULTI_SZ list.

Note:


--*/
{
    NTSTATUS    Status = STATUS_SUCCESS;
    BYTE        Buffer[ELF_MAX_REG_KEY_INFO_SIZE];
    PKEY_NODE_INFORMATION KeyBuffer = (PKEY_NODE_INFORMATION) Buffer;
    ULONG       ActualSize;
    PWCHAR      SubKeyString;
    UNICODE_STRING NewModule;
    ANSI_STRING ModuleNameA;
    PLOGMODULE  pModule;
    ULONG       Index = 0;
    ATOM        Atom;
    PWCHAR      pList;
    DWORD       ListLength = 0;
    UNICODE_STRING ListName;
    BOOLEAN     ListChanged = FALSE;
    PLIST_ENTRY  pListEntry;
#ifdef _CAIRO_
    SHORT       sCategory;
    SHORT       sSeverity;
#endif // _CAIRO_

    //
    // Create the module structures for all modules under this logfile.  We
    // don't actually need to open the key, since we don't use any information
    // stored there, it's existence is all we care about here.  Any data is
    // used by the Event Viewer (or any viewing app).  If this is used to
    // setup a backup file, hLogFile is NULL since there aren't any other
    // modules to map to this file.
    //

    while (NT_SUCCESS(Status) && hLogFile) {

        Status = NtEnumerateKey(hLogFile, Index++, KeyNodeInformation,
            KeyBuffer, ELF_MAX_REG_KEY_INFO_SIZE, & ActualSize);

        if (NT_SUCCESS(Status)) {

            //
            // It turns out the Name isn't null terminated, so we need
            // to copy it somewhere and null terminate it before we use it
            //

            SubKeyString = ElfpAllocateBuffer(KeyBuffer->NameLength +
                sizeof(WCHAR));
            if (!SubKeyString) {
                return(STATUS_NO_MEMORY);
            }

            memcpy(SubKeyString, KeyBuffer->Name, KeyBuffer->NameLength);
            SubKeyString[KeyBuffer->NameLength / sizeof(WCHAR)] = L'\0' ;

            //
            // Add the atom for this module name
            //

            RtlInitUnicodeString(&NewModule, SubKeyString);

            Status = RtlUnicodeStringToAnsiString (
                            &ModuleNameA,
                            &NewModule,
                            TRUE
                            );

            if (!NT_SUCCESS(Status)) {
                //
                // We can't continue, so we will leave the modules
                // we've linked so far, and move on in an attempt to
                // create the Sources MULTI_SZ list.
                //
                ElfpFreeBuffer(SubKeyString);
                break;
            }

            Atom = FindAtomA (ModuleNameA.Buffer);

            //
            // Make sure we've not already added one by this name
            //

#ifdef _CAIRO_
            if (pModule = FindModuleStrucFromAtom(Atom)) {
#else
            if (FindModuleStrucFromAtom(Atom)) {
#endif // _CAIRO_

                //
                // We've already encountered a module by this name.  If
                // this is init time, it's a configuration error.  Report
                // it and move on.  If we're processing a change notify
                // from the registry, this is ok, so just press on
                //
                //              ** NEW FOR CAIRO **
                //
                // Update the module alert category & severity values. i.e.,
                // only upon registry change notify.
                //

                if (!bAllowDupes) {

                    ElfDbgPrint(("[ELF] Same module exists in two log files - "
                        "%ws\n", SubKeyString));
                }

#ifdef _CAIRO_
                if (GetSourceAlertFilterFromRegistry(hLogFile,
                                                     &NewModule,
                                                     &sCategory,
                                                     &sSeverity))
                {
                    pModule->AlertCategory = sCategory;
                    pModule->AlertSeverity = sSeverity;
                }
#endif // _CAIRO_

                RtlFreeAnsiString (&ModuleNameA);
                ElfpFreeBuffer(SubKeyString);
                continue;

            }

            ListChanged = TRUE;

            pModule  = ElfpAllocateBuffer (sizeof (LOGMODULE) );
            if (!pModule) {
                ElfpFreeBuffer(SubKeyString);
                return(STATUS_NO_MEMORY);
            }

            //
            // Set up a module data structure for this module
            //

            pModule->LogFile = pLogFile;
            pModule->ModuleName = SubKeyString;

#ifdef _CAIRO_
            if (GetSourceAlertFilterFromRegistry(hLogFile,
                                                 &NewModule,
                                                 &sCategory,
                                                 &sSeverity))
            {
                pModule->AlertCategory = sCategory;
                pModule->AlertSeverity = sSeverity;
            }
            else
            {
                pModule->AlertCategory = pModule->AlertSeverity = 0;
            }
#endif // _CAIRO_

            if (NT_SUCCESS(Status)) {

                //
                // Link the new module in.
                //

                LinkLogModule(pModule, &ModuleNameA);

                RtlFreeAnsiString (&ModuleNameA);
            }
        }
    }

    if (Status == STATUS_NO_MORE_ENTRIES) {

        //
        // It's not required that there are configured modules for a log
        // file.
        //

        Status = STATUS_SUCCESS;
    }

    //
    // If the list has changed, or if we've been called during init, and not
    // as the result of a changenotify on the registry (bAllowDupes == FALSE)
    // then create the sources key
    //

    if (hLogFile && (ListChanged || !bAllowDupes)) {

        //
        // Now create a MULTI_SZ entry with all the module names for eventvwr
        //
        // STEP 1: Calculate amount of storage needed by running thru the
        //         module list, finding any module that uses this log file.
        //
        pListEntry = LogModuleHead.Flink;
        while (pListEntry != &LogModuleHead) {

            pModule = CONTAINING_RECORD (pListEntry, LOGMODULE, ModuleList);

            if (pModule->LogFile == pLogFile) {
                //
                // This one is for the log we're working on, get the
                // size of it's name.
                //
                ListLength += WCSSIZE(pModule->ModuleName);
            }
            pListEntry = pModule->ModuleList.Flink;
        }

        //
        // STEP 2:  Allocate storage for the MULTI_SZ.
        //
        pList = ElfpAllocateBuffer(ListLength + sizeof(WCHAR));

        //
        // If I can't allocate the list, just press on
        //

        if (pList) {

            //
            // STEP 3: Copy all the module names for this logfile into
            //         the MULTI_SZ string.
            //
            SubKeyString = pList; // Save this away

            pListEntry = LogModuleHead.Flink;

            while (pListEntry != &LogModuleHead) {

                pModule = CONTAINING_RECORD (
                                        pListEntry,
                                        LOGMODULE,
                                        ModuleList
                                        );

                if (pModule->LogFile == pLogFile) {

                    //
                    // This one is for the log we're working on, put it in the list
                    //

                    wcscpy(pList, pModule->ModuleName);
                    pList += wcslen(pModule->ModuleName);
                    pList++;

                }

                pListEntry = pModule->ModuleList.Flink;

            }

            *pList = L'\0'; // The terminating NULL

            RtlInitUnicodeString(&ListName, L"Sources");

            Status = NtSetValueKey(hLogFile,
                                   &ListName,
                                   0,
                                   REG_MULTI_SZ,
                                   SubKeyString,
                                   ListLength + sizeof(WCHAR)
                                   );

            ElfpFreeBuffer(SubKeyString);
        }
    }

    return(Status);

}


NTSTATUS
ElfSetUpConfigDataStructs (
        VOID
    )

/*++

Routine Description:

    This routine sets up all the necessary data structures for the eventlog
    service.  It enumerates the keys in the Logfiles registry node to
    determine what to setup.

Arguments:

    NONE

Return Value:

    NONE

Note:


--*/
{
    NTSTATUS Status = STATUS_SUCCESS;
    HANDLE hLogFile;
    OBJECT_ATTRIBUTES ObjectAttributes;
    UNICODE_STRING SubKeyName;
    PUNICODE_STRING pLogFileName = NULL;
    PUNICODE_STRING pModuleName = NULL;
    UNICODE_STRING EventlogModuleName;
    ULONG Index = 0;
    BYTE Buffer[ELF_MAX_REG_KEY_INFO_SIZE];
    PKEY_NODE_INFORMATION KeyBuffer = (PKEY_NODE_INFORMATION) Buffer;
    ULONG ActualSize;
    LOG_FILE_INFO LogFileInfo;
    PWCHAR SubKeyString;
    LPWSTR ModuleName;

    ElfDbgPrint(("[ELF] Set up config data structures\n"));

    //
    // Initialize the Atom table whose size is the maximum number of
    // module structures possible, i.e. ELF_MAX_LOG_MODULES.
    //

    if (! (InitAtomTable ( ELF_MAX_LOG_MODULES ))) {
        return (STATUS_UNSUCCESSFUL);
    }

    //
    // Get a handle to the Logfiles subkey.  If it doesn't exist, just use
    // the hard-coded defaults.
    //

    if (hEventLogNode) {

        //
        // Loop thru the subkeys under Eventlog and set up each logfile
        //

        while (NT_SUCCESS(Status)) {

            Status = NtEnumerateKey(hEventLogNode, Index++, KeyNodeInformation,
                KeyBuffer, ELF_MAX_REG_KEY_INFO_SIZE, & ActualSize);

            if (NT_SUCCESS(Status)) {

                //
                // It turns out the Name isn't null terminated, so we need
                // to copy it somewhere and null terminate it before we use it
                //

                SubKeyString = ElfpAllocateBuffer(KeyBuffer->NameLength +
                    sizeof(WCHAR));
                if (!SubKeyString) {
                    return(STATUS_NO_MEMORY);
                }

                memcpy(SubKeyString, KeyBuffer->Name, KeyBuffer->NameLength);
                SubKeyString[KeyBuffer->NameLength / sizeof(WCHAR)] = L'\0' ;

                //
                // Open the node for this logfile and extract the information
                // required by SetupDataStruct, and then call it.
                //

                RtlInitUnicodeString(&SubKeyName, SubKeyString);

                InitializeObjectAttributes(&ObjectAttributes,
                                          &SubKeyName,
                                          OBJ_CASE_INSENSITIVE,
                                          hEventLogNode,
                                          NULL
                                          );

                Status = NtOpenKey(&hLogFile, KEY_READ | KEY_SET_VALUE,
                    &ObjectAttributes);
                if (!NT_SUCCESS(Status)) {
                    //
                    // Unclear how this could happen since I just enum'ed
                    // it, but if I can't open it, I just pretend like it
                    // wasn't there to begin with.
                    //

                    ElfpFreeBuffer(SubKeyString);
                    Status = STATUS_SUCCESS; // so we don't terminate the loop
                    continue;
                }

                //
                // Get the information from the registry
                //

                Status = ReadRegistryInfo(hLogFile, &SubKeyName,
                    & LogFileInfo);

                if (NT_SUCCESS(Status)) {

                    //
                    // Now set up the actual data structures.  Failures are
                    // dealt with in the routine
                    //

                    SetUpDataStruct(LogFileInfo.LogFileName,
                                    LogFileInfo.MaxFileSize,
                                    LogFileInfo.Retention,
                                    LogFileInfo.GuestAccessRestriction,
                                    & SubKeyName,
                                    hLogFile,
                                    ElfNormalLog
                                    );

                    NtClose(hLogFile);

                }
            }

        }
    } // if (hEventLogNode)
    else {

        //
        // The information doesn't exist in the registry, set up the
        // three default logs.
        //

        pLogFileName = ElfpAllocateBuffer(sizeof(UNICODE_STRING));
        pModuleName = ElfpAllocateBuffer(sizeof(UNICODE_STRING));
        if (!pLogFileName || !pModuleName) {
            return(STATUS_NO_MEMORY);
        }
        RtlInitUnicodeString(pLogFileName,
            ELF_APPLICATION_DEFAULT_LOG_FILE);
        RtlInitUnicodeString(pModuleName, ELF_DEFAULT_MODULE_NAME);
        SetUpDataStruct(pLogFileName,
            ELF_DEFAULT_MAX_FILE_SIZE,
            ELF_DEFAULT_RETENTION_PERIOD,
            ELF_GUEST_ACCESS_UNRESTRICTED,
            pModuleName,
            NULL,
            ElfNormalLog
            );


        pLogFileName = ElfpAllocateBuffer(sizeof(UNICODE_STRING));
        pModuleName = ElfpAllocateBuffer(sizeof(UNICODE_STRING));
        if (!pLogFileName || !pModuleName) {
            return(STATUS_NO_MEMORY);
        }
        RtlInitUnicodeString(pLogFileName,
            ELF_SYSTEM_DEFAULT_LOG_FILE);
        RtlInitUnicodeString(pModuleName, ELF_SYSTEM_MODULE_NAME);
        SetUpDataStruct(pLogFileName,
            ELF_DEFAULT_MAX_FILE_SIZE,
            ELF_DEFAULT_RETENTION_PERIOD,
            ELF_GUEST_ACCESS_UNRESTRICTED,
            pModuleName,
            NULL,
            ElfNormalLog
            );


        pLogFileName = ElfpAllocateBuffer(sizeof(UNICODE_STRING));
        pModuleName = ElfpAllocateBuffer(sizeof(UNICODE_STRING));
        if (!pLogFileName || !pModuleName) {
            return(STATUS_NO_MEMORY);
        }
        RtlInitUnicodeString(pLogFileName,
            ELF_SECURITY_DEFAULT_LOG_FILE);
        RtlInitUnicodeString(pModuleName, ELF_SECURITY_MODULE_NAME);
        SetUpDataStruct(pLogFileName,
            ELF_DEFAULT_MAX_FILE_SIZE,
            ELF_DEFAULT_RETENTION_PERIOD,
            ELF_GUEST_ACCESS_UNRESTRICTED,
            pModuleName,
            NULL,
            ElfNormalLog
            );
    }

    //
    // If we just ran out of keys, that's OK (unless there weren't any at all)
    //

    if (Status == STATUS_NO_MORE_ENTRIES && Index != 1) {
        Status = STATUS_SUCCESS;
    }

    if (NT_SUCCESS(Status)) {

        //
        // Make sure we created the Application log file, since it is the
        // default.  If it wasn't created, use the first module created
        // (this is at the tail of the list since I insert them at the
        // head).  If this happens, send an alert to the admin.
        //

        if (!ElfDefaultLogModule) {
            ElfDbgPrintNC(("[ELF] No Logfile entry for Application module, "
                "default will be created\n"));

            if (IsListEmpty(&LogModuleHead)) {
                //
                // No logs were created, might as well shut down
                //

                return(STATUS_EVENTLOG_CANT_START);
            }

            ElfDefaultLogModule = CONTAINING_RECORD(LogModuleHead.Blink,
                                                    LOGMODULE,
                                                    ModuleList);

            ModuleName = L"Application";
            ElfpCreateQueuedAlert(ALERT_ELF_DefaultLogCorrupt, 1,
                &(ElfDefaultLogModule->LogFile->LogModuleName->Buffer));

        }

        //
        // Now get the Module for the Eventlog service to use.  GetModuleStruc
        // always succeeds, returning the default log if the requested one
        // isn't configured.
        //

        RtlInitUnicodeString(&EventlogModuleName, L"eventlog");
        ElfModule = GetModuleStruc(&EventlogModuleName);

    } else {

        if (pLogFileName && pModuleName) {
            ElfDbgPrintNC(("[ELF] Failure Setting up data structs for file %ws, "
                "Module %ws - %X\n", pLogFileName->Buffer, pModuleName->Buffer,
                Status));
        }
        else {
            ElfDbgPrintNC(("[ELF] Failure setting up data structs.  No logs"
                " defined in registry\n"));
        }
    }


    return (Status);

}


VOID
SVCS_ENTRY_POINT(       // (ELF_main)
    DWORD               argc,
    LPWSTR              argv[],
    PSVCS_GLOBAL_DATA   SvcsGlobalData,
    HANDLE              SvcRefHandle
    )

/*++

Routine Description:

    This is the main routine for the Event Logging Service.


Arguments:

    Command-line arguments.

Return Value:

    NONE

Note:


--*/
{

    NTSTATUS    Status;
    OBJECT_ATTRIBUTES ObjectAttributes;
    UNICODE_STRING RootRegistryNode;
    ULONG Win32Error = 0;
    ELF_REQUEST_RECORD FlushRequest;
    UNICODE_STRING ValueName;
    BYTE Buffer[ELF_MAX_REG_KEY_INFO_SIZE];
    PKEY_VALUE_FULL_INFORMATION ValueBuffer =
        (PKEY_VALUE_FULL_INFORMATION) Buffer;
    SID_IDENTIFIER_AUTHORITY NtAuthority = SECURITY_NT_AUTHORITY;

    UNREFERENCED_PARAMETER(argc);
    UNREFERENCED_PARAMETER(argv);

    ElfGlobalSvcRefHandle = SvcRefHandle;
    ElfGlobalData = SvcsGlobalData;

    //
    // Initialize the list heads for the modules and log files.
    //

    InitializeListHead ( &LogFilesHead );
    InitializeListHead ( &LogModuleHead );
    InitializeListHead ( &QueuedEventListHead );
    InitializeListHead ( &QueuedMessageListHead );

    //
    // Initialize to 0 so that we can clean up before exiting
    //

    EventFlags = 0;

    //
    //
    // Tuck away the local computer name
    //

    ComputerNameLength = 0;
    GetComputerNameW(LocalComputerName, &ComputerNameLength);
    ComputerNameLength += sizeof(WCHAR); // account for the NULL
    LocalComputerName = ElfpAllocateBuffer(ComputerNameLength * sizeof (WCHAR));
    if (!LocalComputerName ||
        !GetComputerNameW(LocalComputerName, &ComputerNameLength)) {
       ComputerNameLength = 0;
    }
    ComputerNameLength = (ComputerNameLength + 1) * sizeof(WCHAR);

    //
    // Initialize the status data.
    //
    ElInitStatus();

    // Set up control handler
    //

    ElfDbgPrint(("[ELF] Calling RegisterServiceCtrlHandler\n"));
    if ((ElfServiceStatusHandle = RegisterServiceCtrlHandler(
                                      wname_Eventlogsvc,
                                      ElfControlResponse
                                      )) == (SERVICE_STATUS_HANDLE) NULL) {

        Win32Error = GetLastError();

        //
        // If we got an error, we need to set status to uninstalled, and end the
        // thread.
        //

        ElfDbgPrintNC(("[ELF] RegisterServiceCtrlHandler = %u\n",Win32Error));
        goto cleanupandexit;
    }

    // Initialize all the status fields so that subsequent calls to
    // SetServiceStatus only need to update fields that changed.
    //

    //
    // Notify the Service Controller for the first time that we are alive
    // and is in a start pending state
    //
    //  *** UPDATE STATUS ***
    ElfStatusUpdate(STARTING);

    //
    // Get the localized title for message box popups.
    //
    ElfInitMessageBoxTitle();

    //
    // Set up the object that describes the root node for the eventlog service
    //

    RtlInitUnicodeString(&RootRegistryNode, REG_EVENTLOG_NODE_PATH);
    InitializeObjectAttributes(&ObjectAttributes,
                               &RootRegistryNode,
                               OBJ_CASE_INSENSITIVE,
                               NULL,
                               NULL
                               );
    //
    // If this fails, we'll just use the defaults
    //

    NtOpenKey(&hEventLogNode, KEY_READ | KEY_NOTIFY, &ObjectAttributes);

    //
    // See if there's a debug key
    //

    RtlInitUnicodeString(&ValueName, VALUE_DEBUG);

    NtQueryValueKey(hEventLogNode, &ValueName,
        KeyValueFullInformation, ValueBuffer,
        ELF_MAX_REG_KEY_INFO_SIZE, & ElfDebug);

    //
    // Initialize a critical section for use when adding or removing
    // LogFiles or LogModules. This must be done before we process any
    // file information.
    //

    Status = RtlInitializeCriticalSection(
                &LogFileCritSec
                );

    if ( !NT_SUCCESS(Status) ) {
        ElfDbgPrintNC(( "ELF log file crit sec init failed: %X\n", Status ));
        goto cleanupandexit;

    }
    Status = RtlInitializeCriticalSection(
                &LogModuleCritSec
                );

    if ( !NT_SUCCESS(Status) ) {
        ElfDbgPrintNC(( "ELF log file crit sec init failed: %X\n", Status ));
        goto cleanupandexit;

    }
    EventFlags |= ELF_INIT_LOGFILE_CRIT_SEC;

    Status = RtlInitializeCriticalSection(
                &QueuedEventCritSec
                );

    if ( !NT_SUCCESS(Status) ) {
        ElfDbgPrintNC(( "ELF queued event crit sec init failed: %X\n", Status ));
        goto cleanupandexit;

    }

    EventFlags |= ELF_INIT_QUEUED_EVENT_CRIT_SEC;

    Status = RtlInitializeCriticalSection(
                &QueuedMessageCritSec
                );

    if ( !NT_SUCCESS(Status) ) {
        ElfDbgPrintNC(( "ELF queued message crit sec init failed: %X\n", Status ));
        goto cleanupandexit;

    }

    EventFlags |= ELF_INIT_QUEUED_MESSAGE_CRIT_SEC;

    //
    // Initialize global anonymous logon sid for use in log ACL's.
    //

    Status = RtlAllocateAndInitializeSid(
                &NtAuthority,
                1,
                SECURITY_ANONYMOUS_LOGON_RID,
                0, 0, 0, 0, 0, 0, 0,
                &AnonymousLogonSid);

    if ( !NT_SUCCESS(Status) ) {
        ElfDbgPrintNC(("ELF anonymous log sid creation failed: %X\n",
                    Status ));
        goto cleanupandexit;
    }

    //
    // Set up the data structures for the Logfiles and Modules.
    //

    Status = ElfSetUpConfigDataStructs ();

    if ( !NT_SUCCESS(Status) ) {
        goto cleanupandexit;
    }

    //
    // Tell service controller of that we are making progress
    //
    //  *** UPDATE STATUS ***
    ElfStatusUpdate(STARTING);

    //
    // Initialize a critical section for use when adding or removing
    // context-handles (LogHandles).
    //

    Status = RtlInitializeCriticalSection(
                &LogHandleCritSec
                );

    if ( !NT_SUCCESS(Status) ) {
        ElfDbgPrintNC(( "ELF log handle crit sec init failed: %X\n", Status ));
        goto cleanupandexit;

    }
    EventFlags |= ELF_INIT_LOGHANDLE_CRIT_SEC;

    //
    // Initialize the context handle (log handle) list.
    //

    InitializeListHead( &LogHandleListHead );

    //
    // Initialize the Global Resource.
    //

    RtlInitializeResource ( &GlobalElfResource );
    EventFlags |= ELF_INIT_GLOBAL_RESOURCE;

    //
    // Tell service controller of that we are making progress
    //
    //  *** UPDATE STATUS ***
    ElfStatusUpdate(STARTING);

    //
    // Tell service controller of that we are making progress
    //
    //  *** UPDATE STATUS ***
    ElfStatusUpdate(STARTING);

    // Create a thread for watching the LPC port.
    //

    if (!StartLPCThread ()) {
        Status = STATUS_UNSUCCESSFUL;
        goto cleanupandexit;
    }
    EventFlags |= ELF_STARTED_LPC_THREAD;

    //
    // Tell service controller of that we are making progress
    //
    //  *** UPDATE STATUS ***
    ElfStatusUpdate(STARTING);

#ifdef _CAIRO_
    //
    // The eventlog service links to ALERTSYS.DLL by hand (eventlog.c) after
    // eventlog initialization, since this dll's initialization code requires
    // a running eventlog service.
    //
    // By no means, fail to start this service if something fails here.
    // It just won't be possible to raise NT events as Cairo alerts.
    //
    // BUGBUG : Should probably at least log an error.
    //          Should the service state be STARTING while this
    //          initialization is in progress?
    //

    if ((ghAlertSysDll = LoadLibrary(L"ALERTSYS.DLL")) != NULL)
    {
        //
        // Get ReportAlert API address.
        //

        if ((gpfReportAlert = (PREPORTALERT)GetProcAddress(
                                                (HMODULE)ghAlertSysDll,
                                                "ReportAlert")) == NULL)
        {
            FreeLibrary(ghAlertSysDll);
            ghAlertSysDll = NULL;
            ElfDbgPrintNC((
                "[ELF] ReportAlert GetProAddress failed, WIN32 error(%x)\n",
                GetLastError()));
        }
    }
    else
    {
        ElfDbgPrintNC((
            "[ELF] LoadLibrary of ALERTSYS.DLL failed, WIN32 error(%x)\n",
            GetLastError()));
    }

    //
    // Tell service controller of that we are making progress
    //
    //  *** UPDATE STATUS ***
    ElfStatusUpdate(STARTING);

#endif // _CAIRO_

    // Create a thread for watching for changes in the registry.
    //

    if (!ElfStartRegistryMonitor ()) {
        Status = STATUS_UNSUCCESSFUL;
        goto cleanupandexit;
    }
    EventFlags |= ELF_STARTED_REGISTRY_MONITOR;

    //
    // Write out an event that says we started
    //

    ElfpCreateElfEvent(EVENT_EventlogStarted,
                       EVENTLOG_INFORMATION_TYPE,
                       0,                    // EventCategory
                       0,                    // NumberOfStrings
                       NULL,                 // Strings
                       NULL,                 // Data
                       0,                    // Datalength
                       0                     // flags
                       );

    //
    // Write out any events that were queued up during initialization
    //

    FlushRequest.Command = ELF_COMMAND_WRITE_QUEUED;

    ElfPerformRequest(&FlushRequest);

    //
    // Tell service controller of that we are making progress
    //
    //  *** UPDATE STATUS ***
    ElfStatusUpdate(STARTING);

    //
    // Finish setting up the RPC server
    //
    // NOTE:  Now all RPC servers in services.exe share the same pipe name.
    // However, in order to support communication with version 1.0 of WinNt,
    // it is necessary for the Client Pipe name to remain the same as
    // it was in version 1.0.  Mapping to the new name is performed in
    // the Named Pipe File System code.
    //
    Status = ElfGlobalData->StartRpcServer(
                ElfGlobalData->SvcsRpcPipeName,
                eventlog_ServerIfHandle);

    if (Status != NO_ERROR) {
        ElfDbgPrint(("[ELF]StartRpcServer Failed %d\n",Status));
        goto cleanupandexit;
    }

    //
    // Tell service controller of that we are making progress
    //

    if (ElfStatusUpdate(RUNNING) == RUNNING) {
        ElfDbgPrint(("[ELF] Service Started Successfully\n"));
    }

    EventFlags |= ELF_STARTED_RPC_SERVER;

    if (GetElState() == RUNNING) {
        ElfDbgPrint(("[ELF] Service Running - main thread is returning\n"));
        return;
    }

//
// Come here if there is cleanup necessary.
//

cleanupandexit:

    ElfDbgPrint(("[ELF] Leaving the service\n"));

    if (!Win32Error) {
        Win32Error = RtlNtStatusToDosError(Status);
    }
    ElfBeginForcedShutdown(PENDING,Win32Error,Status);

    //
    // If the registry monitor has been initialized, then
    // let it do the shutdown cleanup.  All we need to do
    // here is wake it up.
    // Otherwise, this thread will do the cleanup.
    //
    if (EventFlags & ELF_STARTED_REGISTRY_MONITOR) {
        StopRegistryMonitor();
    }
    else {
        ElfpCleanUp(EventFlags);
        //
        // We should actually return here so that the DLL gets unloaded.
        // However, RPC has a problem in that it might still call our
        // context rundown routine even though we unregistered our interface.
        // So we exit thread instead.  This keeps our Dll loaded.
        //
        ExitThread(0);
    }
    return;
}

VOID
ElfInitMessageBoxTitle(
    VOID
    )

/*++

Routine Description:

    Obtains the title text for the message box used to display messages.
    If the title is successfully obtained from the message file, then
    that title is pointed to by GlobalAllocatedMsgTitle and
    GlobalMessageBoxTitle.  If unsuccessful, then GlobalMessageBoxTitle
    left pointing to the DefaultMessageBoxTitle.

    NOTE:  If successful, a buffer is allocated by this function.  The
    pointer stored in GlobalAllocatedMsgTitle and it should be freed when
    done with this buffer.

Arguments:

Return Value:

    none

--*/
{
    LPVOID      hModule;
    DWORD       msgSize;
    DWORD       status=NO_ERROR;

    GlobalAllocatedMsgTitle = NULL;

    hModule = LoadLibrary( L"netevent.dll");
    if ( hModule == NULL) {
        status = GetLastError();
        ElfDbgPrint(("LoadLibrary() fails with winError = %d\n", GetLastError()));
        return;
    }
    msgSize = FormatMessageW(
                FORMAT_MESSAGE_FROM_HMODULE |       //  dwFlags
                FORMAT_MESSAGE_ARGUMENT_ARRAY |
                FORMAT_MESSAGE_ALLOCATE_BUFFER,
                hModule,
                TITLE_EventlogMessageBox,           //  MessageId
                0,                                  //  dwLanguageId
                (LPWSTR)&GlobalAllocatedMsgTitle,   //  lpBuffer
                0,                                  //  nSize
                NULL);

    if (msgSize == 0) {
        status = GetLastError();
        ElfDbgPrint((ERROR,"Could not find MessageBox title in a message file %d\n",
        status));
    }
    else {
        GlobalMessageBoxTitle = GlobalAllocatedMsgTitle;
    }

    FreeLibrary(hModule);
    return;
}