windows-server-2003/ds/netapi/svcdlls/browser/server/brdmmstr.c

/*++

Copyright (c) 1991  Microsoft Corporation

Module Name:

    brdmmstr.c

Abstract:

    This module contains the routines to manage a domain master browser server

Author:

    Rita Wong (ritaw) 20-Feb-1991

Revision History:

--*/

#include "precomp.h"
#pragma hdrstop

//-------------------------------------------------------------------//
//                                                                   //
// Local structure definitions                                       //
//                                                                   //
//-------------------------------------------------------------------//

//-------------------------------------------------------------------//
//                                                                   //
// Local function prototypes                                         //
//                                                                   //
//-------------------------------------------------------------------//

VOID
GetMasterAnnouncementCompletion (
    IN PVOID Ctx
    );

typedef struct _BROWSER_GET_MASTER_ANNOUNCEMENT_CONTEXT {
    PDOMAIN_INFO DomainInfo;
    HANDLE EventHandle;
    NET_API_STATUS NetStatus;
} BROWSER_GET_MASTER_ANNOUNCEMENT_CONTEXT, *PBROWSER_GET_MASTER_ANNOUNCEMENT_CONTEXT;

NET_API_STATUS
PostGetMasterAnnouncement (
    PNETWORK Network
    )
/*++

Routine Description:

    Ensure the GetMasterAnnouncement request is posted for a particular network.

Arguments:

    None.

Return Value:

    Status - The status of the operation.

--*/
{
    NET_API_STATUS NetStatus = NERR_Success;

#ifdef ENABLE_PSEUDO_BROWSER
    if ( BrInfo.PseudoServerLevel == BROWSER_PSEUDO ) {
        // No master announcement handling for a phase out server
        return NERR_Success;
    }
#endif

    if (!LOCK_NETWORK(Network)) {
        return NERR_InternalError;
    }

    if ( (Network->Flags & NETWORK_PDC) != 0  &&
         (Network->Flags & NETWORK_WANNISH) != 0 ) {

        if (!(Network->Flags & NETWORK_GET_MASTER_ANNOUNCE_POSTED)) {

            BrPrint(( BR_MASTER,
                      "%ws: %ws: Doing PostGetMasterAnnouncement\n",
                      Network->DomainInfo->DomUnicodeDomainName,
                      Network->NetworkName.Buffer));

            NetStatus = BrIssueAsyncBrowserIoControl(Network,
                                        IOCTL_LMDR_WAIT_FOR_MASTER_ANNOUNCE,
                                        GetMasterAnnouncementCompletion,
                                        NULL
                                        );

            if ( NetStatus == NERR_Success ) {
                Network->Flags |= NETWORK_GET_MASTER_ANNOUNCE_POSTED;
            }
        } else {
            BrPrint(( BR_MASTER,
                      "%ws: %ws: PostGetMasterAnnouncement already posted.\n",
                      Network->DomainInfo->DomUnicodeDomainName,
                      Network->NetworkName.Buffer));
        }
    }

    UNLOCK_NETWORK(Network);
    return NetStatus;
}


VOID
GetMasterAnnouncementCompletion (
    IN PVOID Ctx
    )
/*++

Routine Description:

    This function is the completion routine for a master announcement.  It is
    called whenever a master announcement is received for a particular network.

Arguments:

    Ctx - Context block for request.

Return Value:

    None.

--*/


{
    PVOID ServerList = NULL;
    ULONG EntriesRead;
    ULONG TotalEntries;
    NET_API_STATUS Status = NERR_Success;
    PBROWSERASYNCCONTEXT Context = Ctx;
    PLMDR_REQUEST_PACKET MasterAnnouncement = Context->RequestPacket;
    PNETWORK Network = Context->Network;
    LPTSTR RemoteMasterName = NULL;
    BOOLEAN NetLocked = FALSE;
    BOOLEAN NetReferenced = FALSE;


    try {
        //
        // Ensure the network wasn't deleted from under us.
        //
        if ( BrReferenceNetwork( Network ) == NULL ) {
            try_return(NOTHING);
        }
        NetReferenced = TRUE;

        if (!LOCK_NETWORK(Network)){
            try_return(NOTHING);
        }
        NetLocked = TRUE;

        Network->Flags &= ~NETWORK_GET_MASTER_ANNOUNCE_POSTED;

        //
        //  The request failed for some reason - just return immediately.
        //

        if (!NT_SUCCESS(Context->IoStatusBlock.Status)) {
            try_return(NOTHING);
        }

        Status = PostGetMasterAnnouncement(Network);

        if (Status != NERR_Success) {
            BrPrint(( BR_CRITICAL,
                      "%ws: %ws: Unable to re-issue GetMasterAnnouncement request: %lx\n",
                      Network->DomainInfo->DomUnicodeDomainName,
                      Network->NetworkName.Buffer,
                      Status));

            try_return(NOTHING);

        }


        RemoteMasterName = MIDL_user_allocate(MasterAnnouncement->Parameters.WaitForMasterAnnouncement.MasterNameLength+3*sizeof(TCHAR));

        if (RemoteMasterName == NULL) {
            try_return(NOTHING);
        }

        RemoteMasterName[0] = TEXT('\\');
        RemoteMasterName[1] = TEXT('\\');

        STRNCPY(&RemoteMasterName[2],
                MasterAnnouncement->Parameters.WaitForMasterAnnouncement.Name,
                MasterAnnouncement->Parameters.WaitForMasterAnnouncement.MasterNameLength/sizeof(TCHAR));

        RemoteMasterName[(MasterAnnouncement->Parameters.WaitForMasterAnnouncement.MasterNameLength/sizeof(TCHAR))+2] = UNICODE_NULL;

        BrPrint(( BR_MASTER,
                  "%ws: %ws: GetMasterAnnouncement: Got a master browser announcement from %ws\n",
                  Network->DomainInfo->DomUnicodeDomainName,
                  Network->NetworkName.Buffer,
                  RemoteMasterName));

        UNLOCK_NETWORK(Network);

        NetLocked = FALSE;

        //
        //  Remote the api and pull the browse list from the remote server.
        //

        Status = RxNetServerEnum(RemoteMasterName,
                                     Network->NetworkName.Buffer,
                                     101,
                                     (LPBYTE *)&ServerList,
                                     0xffffffff,
                                     &EntriesRead,
                                     &TotalEntries,
                                     SV_TYPE_LOCAL_LIST_ONLY,
                                     NULL,
                                     NULL
                                     );

        if ((Status == NERR_Success) || (Status == ERROR_MORE_DATA)) {

            if (!LOCK_NETWORK(Network)) {
                try_return(NOTHING);
            }

            NetLocked = TRUE;

            Status = MergeServerList(&Network->BrowseTable,
                                     101,
                                     ServerList,
                                     EntriesRead,
                                     TotalEntries
                                     );

            UNLOCK_NETWORK(Network);

            NetLocked = FALSE;

            (void) NetApiBufferFree( ServerList );
            ServerList = NULL;

        } else {

            BrPrint(( BR_MASTER,
                      "%ws: %ws: GetMasterAnnouncement: Cannot get server list from %ws (%ld)\n",
                      Network->DomainInfo->DomUnicodeDomainName,
                      Network->NetworkName.Buffer,
                      RemoteMasterName,
                      Status ));
        }

        //
        //  Remote the api and pull the browse list from the remote server.
        //

        Status = RxNetServerEnum(RemoteMasterName,
                                     Network->NetworkName.Buffer,
                                     101,
                                     (LPBYTE *)&ServerList,
                                     0xffffffff,
                                     &EntriesRead,
                                     &TotalEntries,
                                     SV_TYPE_LOCAL_LIST_ONLY | SV_TYPE_DOMAIN_ENUM,
                                     NULL,
                                     NULL
                                     );

        if ((Status == NERR_Success) || (Status == ERROR_MORE_DATA)) {

            if (!LOCK_NETWORK(Network)) {
                try_return(NOTHING);
            }

            NetLocked = TRUE;

            Status = MergeServerList(&Network->DomainList,
                                     101,
                                     ServerList,
                                     EntriesRead,
                                     TotalEntries
                                     );

        } else {

            BrPrint(( BR_MASTER,
                      "%ws: %ws: GetMasterAnnouncement: Cannot get domain list from %ws (%ld)\n",
                      Network->DomainInfo->DomUnicodeDomainName,
                      Network->NetworkName.Buffer,
                      RemoteMasterName,
                      Status ));
        }

try_exit:NOTHING;
    } finally {

        if (NetLocked) {
            UNLOCK_NETWORK(Network);
        }

        if ( NetReferenced ) {
            BrDereferenceNetwork( Network );
        }

        if (RemoteMasterName != NULL) {
            MIDL_user_free(RemoteMasterName);
        }

        MIDL_user_free(Context);

        if ( ServerList != NULL ) {
            (void) NetApiBufferFree( ServerList );
        }

    }

    return;

}