671 lines
19 KiB
C
671 lines
19 KiB
C
/*++
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Copyright (c) 1990 Microsoft Corporation
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Module Name:
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bowmastr.c
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Abstract:
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This module implements all of the master browser related routines for the
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NT browser
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Author:
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Larry Osterman (LarryO) 21-Jun-1990
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Revision History:
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21-Jun-1990 LarryO
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Created
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--*/
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#include "precomp.h"
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#pragma hdrstop
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#define INCLUDE_SMB_TRANSACTION
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NTSTATUS
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StartProcessingAnnouncements(
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IN PTRANSPORT_NAME TransportName,
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IN PVOID Context
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);
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VOID
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BowserMasterAnnouncementWorker(
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IN PVOID Ctx
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);
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NTSTATUS
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TimeoutFindMasterRequests(
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IN PTRANSPORT Transport,
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IN PVOID Context
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);
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NTSTATUS
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BowserPrimeDomainTableWithOtherDomains(
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IN PTRANSPORT_NAME TransportName,
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IN PVOID Context
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);
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE, BowserBecomeMaster)
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#pragma alloc_text(PAGE, StartProcessingAnnouncements)
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#pragma alloc_text(PAGE, BowserPrimeDomainTableWithOtherDomains)
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#pragma alloc_text(PAGE, BowserNewMaster)
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#pragma alloc_text(PAGE, BowserCompleteFindMasterRequests)
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#pragma alloc_text(PAGE, BowserTimeoutFindMasterRequests)
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#pragma alloc_text(PAGE, TimeoutFindMasterRequests)
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#pragma alloc_text(PAGE, BowserMasterAnnouncementWorker)
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#endif
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NTSTATUS
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BowserBecomeMaster(
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IN PTRANSPORT Transport
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)
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/*++
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Routine Description:
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Make this machine a master browser.
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This routine is called when we are changing the state of a machine from
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backup to master browser.
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Arguments:
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Transport - The transport on which to become a master.
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Return Value
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NTSTATUS - The status of the upgrade operation.
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--*/
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{
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NTSTATUS Status;
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PPAGED_TRANSPORT PagedTransport = Transport->PagedTransport;
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PAGED_CODE();
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try {
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LOCK_TRANSPORT(Transport);
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BowserReferenceDiscardableCode( BowserDiscardableCodeSection );
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//
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// Post the addname on this transport for the master name..
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//
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Status = BowserAllocateName(&Transport->PrimaryDomain->PagedTransportName->Name->Name,
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MasterBrowser,
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Transport);
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if (NT_SUCCESS(Status)) {
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//
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// Post the addname on this transport for the domain announcement.
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//
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Status = BowserAllocateName(&Transport->PrimaryDomain->PagedTransportName->Name->Name,
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DomainAnnouncement,
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Transport);
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}
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//
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// The addition of the name failed - we can't be a master any
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// more.
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//
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if (!NT_SUCCESS(Status)) {
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try_return(Status);
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}
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PagedTransport->Role = Master;
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//
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// Start processing host announcements on each of
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// the names associated with the server.
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//
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BowserForEachTransportName(Transport, StartProcessingAnnouncements, NULL);
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//
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// If we don't have any elements in our announcement table,
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// send a request announcement packet to all the servers to
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// allow ourselves to populate the table as quickly as possible.
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//
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if ((RtlNumberGenericTableElements(&PagedTransport->AnnouncementTable) == 0) &&
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PagedTransport->NumberOfServersInTable == 0) {
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BowserSendRequestAnnouncement(&Transport->PrimaryDomain->PagedTransportName->Name->Name,
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PrimaryDomain,
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Transport);
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}
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//
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// If we don't have any elements in our domain table,
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// send a request announcement packet to all the servers to
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// allow ourselves to populate the table as quickly as possible.
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//
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if ((RtlNumberGenericTableElements(&PagedTransport->DomainTable) == 0) &&
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PagedTransport->NumberOfServersInTable == 0) {
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BowserSendRequestAnnouncement(&Transport->PrimaryDomain->PagedTransportName->Name->Name,
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DomainAnnouncement,
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Transport);
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}
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PagedTransport->TimeMaster = BowserTimeUp();
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//
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// Now walk the transport names associated with this transport and
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// seed all the "otherdomains" into the browse list.
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//
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BowserForEachTransportName(
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Transport,
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BowserPrimeDomainTableWithOtherDomains,
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NULL);
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//
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// Now complete any and all find master requests outstanding on this
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// transport.
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//
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BowserCompleteFindMasterRequests(Transport, &Transport->ComputerName->PagedTransportName->Name->Name, STATUS_REQUEST_NOT_ACCEPTED);
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try_return(Status = STATUS_SUCCESS);
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try_exit:NOTHING;
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} finally {
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if (!NT_SUCCESS(Status)) {
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dprintf(DPRT_ELECT|DPRT_MASTER, ("There's already a master on this net - we need to find who it is"));
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//
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// We couldn't become a master. Reset our state and fail the
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// promotion request.
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//
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PagedTransport->Role = PotentialBackup;
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PagedTransport->ElectionCount = ELECTION_COUNT;
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PagedTransport->Uptime = BowserTimeUp();
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Transport->ElectionState = Idle;
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//
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// Stop processing host announcements on each of
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// the names associated with the server.
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//
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BowserForEachTransportName(Transport, BowserStopProcessingAnnouncements, NULL);
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//
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// Stop any timers that are running (ie. if there's an election
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// in progress)
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//
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BowserStopTimer(&Transport->ElectionTimer);
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//
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// Delete the names we added above.
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//
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BowserDeleteTransportNameByName(Transport,
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&Transport->PrimaryDomain->PagedTransportName->Name->Name,
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MasterBrowser);
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BowserDeleteTransportNameByName(Transport,
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&Transport->PrimaryDomain->PagedTransportName->Name->Name,
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DomainAnnouncement);
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BowserDereferenceDiscardableCode( BowserDiscardableCodeSection );
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}
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UNLOCK_TRANSPORT(Transport);
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}
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return Status;
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}
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NTSTATUS
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StartProcessingAnnouncements(
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IN PTRANSPORT_NAME TransportName,
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IN PVOID Context
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)
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{
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PAGED_CODE();
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ASSERT (TransportName->Signature == STRUCTURE_SIGNATURE_TRANSPORTNAME);
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ASSERT (TransportName->NameType == TransportName->PagedTransportName->Name->NameType);
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if ((TransportName->NameType == OtherDomain) ||
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(TransportName->NameType == MasterBrowser) ||
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(TransportName->NameType == PrimaryDomain) ||
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(TransportName->NameType == BrowserElection) ||
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(TransportName->NameType == DomainAnnouncement)) {
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if (!TransportName->ProcessHostAnnouncements) {
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BowserReferenceDiscardableCode( BowserDiscardableCodeSection );
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DISCARDABLE_CODE( BowserDiscardableCodeSection );
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TransportName->ProcessHostAnnouncements = TRUE;
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}
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}
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return(STATUS_SUCCESS);
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UNREFERENCED_PARAMETER(Context);
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}
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NTSTATUS
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BowserPrimeDomainTableWithOtherDomains(
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IN PTRANSPORT_NAME TransportName,
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IN PVOID Context
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)
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{
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PAGED_CODE();
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if (TransportName->NameType == OtherDomain) {
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PPAGED_TRANSPORT PagedTransport = TransportName->Transport->PagedTransport;
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PTRANSPORT Transport = TransportName->Transport;
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ANNOUNCE_ENTRY OtherDomainPrototype;
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PANNOUNCE_ENTRY Announcement;
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BOOLEAN NewElement;
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RtlZeroMemory( &OtherDomainPrototype, sizeof(OtherDomainPrototype) );
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OtherDomainPrototype.Signature = STRUCTURE_SIGNATURE_ANNOUNCE_ENTRY;
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OtherDomainPrototype.Size = sizeof(OtherDomainPrototype) -
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sizeof(OtherDomainPrototype.ServerComment) +
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Transport->ComputerName->PagedTransportName->Name->Name.Length + sizeof(WCHAR);
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RtlCopyMemory(OtherDomainPrototype.ServerName, TransportName->PagedTransportName->Name->Name.Buffer, TransportName->PagedTransportName->Name->Name.Length);
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OtherDomainPrototype.ServerName[TransportName->PagedTransportName->Name->Name.Length / sizeof(WCHAR)] = UNICODE_NULL;
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RtlCopyMemory(OtherDomainPrototype.ServerComment, Transport->ComputerName->PagedTransportName->Name->Name.Buffer, Transport->ComputerName->PagedTransportName->Name->Name.Length);
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OtherDomainPrototype.ServerComment[Transport->ComputerName->PagedTransportName->Name->Name.Length / sizeof(WCHAR)] = UNICODE_NULL;
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OtherDomainPrototype.ServerType = SV_TYPE_DOMAIN_ENUM;
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OtherDomainPrototype.ServerVersionMajor = 2;
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OtherDomainPrototype.ServerVersionMinor = 0;
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OtherDomainPrototype.ServerPeriodicity = 0xffff;
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OtherDomainPrototype.ExpirationTime = 0xffffffff;
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OtherDomainPrototype.SerialId = 0;
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OtherDomainPrototype.Name = TransportName->PagedTransportName->Name;
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//
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// Make sure that no-one else is messing with the domain list.
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//
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LOCK_ANNOUNCE_DATABASE(Transport);
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Announcement = RtlInsertElementGenericTable(&PagedTransport->DomainTable,
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&OtherDomainPrototype, OtherDomainPrototype.Size, &NewElement);
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if (Announcement != NULL && NewElement ) {
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// Indicate the name is referenced by the announce entry we just inserted.
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BowserReferenceName( OtherDomainPrototype.Name );
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}
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UNLOCK_ANNOUNCE_DATABASE(Transport);
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}
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return(STATUS_SUCCESS);
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}
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VOID
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BowserNewMaster(
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IN PTRANSPORT Transport,
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IN PUCHAR MasterName
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)
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/*++
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Routine Description:
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Flag that a machine is the new master browser server.
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This routine is called to register a new master browser server.
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Arguments:
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IN PTRANSPORT Transport - The transport for the net we're on.
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IN PUCHAR MasterName - The name of the new master browser server.
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Return Value
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None.
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--*/
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{
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PIRP Irp = NULL;
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WCHAR MasterNameBuffer[LM20_CNLEN+1];
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UNICODE_STRING UMasterName;
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OEM_STRING OMasterName;
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NTSTATUS Status;
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PPAGED_TRANSPORT PagedTransport = Transport->PagedTransport;
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PAGED_CODE();
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UMasterName.Buffer = MasterNameBuffer;
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UMasterName.MaximumLength = (LM20_CNLEN+1)*sizeof(WCHAR);
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RtlInitAnsiString(&OMasterName, MasterName);
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Status = RtlOemStringToUnicodeString(&UMasterName, &OMasterName, FALSE);
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if (!NT_SUCCESS(Status)) {
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BowserWriteErrorLogEntry(EVENT_BOWSER_NAME_CONVERSION_FAILED, Status, OMasterName.Buffer, OMasterName.Length, 0);
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return;
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}
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LOCK_TRANSPORT(Transport);
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try {
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//
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// There's a new master, we can stop our election timers.
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//
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PagedTransport->ElectionCount = 0;
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Transport->ElectionState = Idle;
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BowserStopTimer(&Transport->ElectionTimer);
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//
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// Check to see if we are the winner of the election. If we are
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// we want to complete any BecomeMaster requests that are outstanding.
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//
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if (RtlEqualUnicodeString(&UMasterName, &Transport->ComputerName->PagedTransportName->Name->Name, TRUE)) {
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//
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// We're the new master for this domain. Complete any BecomeMaster
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// requests.
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//
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Irp = BowserDequeueQueuedIrp(&Transport->BecomeMasterQueue);
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if (Irp != NULL) {
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//
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// Don't copy anything into the users buffer.
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//
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Irp->IoStatus.Information = 0;
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BowserCompleteRequest(Irp, STATUS_SUCCESS);
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} else {
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//
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// Go deaf to elections until we can become a master.
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//
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Transport->ElectionState = DeafToElections;
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//
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// If we're the master browser, stop being a master browser.
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//
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//
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if (PagedTransport->Role == MasterBrowser) {
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//
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// Delete the names that make us a master.
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//
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BowserDeleteTransportNameByName(Transport,
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&Transport->PrimaryDomain->PagedTransportName->Name->Name,
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MasterBrowser);
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BowserDeleteTransportNameByName(Transport,
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&Transport->PrimaryDomain->PagedTransportName->Name->Name,
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DomainAnnouncement);
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}
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dprintf(DPRT_MASTER, ("Bowser: Unable to find a BecomeMasterIrp\n"));
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}
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//
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// Complete any outstanding find master requests with the special error MORE_PROCESSING_REQUIRED.
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//
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// This will cause the browser service to promote itself.
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//
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BowserCompleteFindMasterRequests(Transport, &UMasterName, STATUS_MORE_PROCESSING_REQUIRED);
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} else {
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BowserCompleteFindMasterRequests(Transport, &UMasterName, STATUS_SUCCESS);
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}
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} finally {
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UNLOCK_TRANSPORT(Transport);
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}
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}
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VOID
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BowserCompleteFindMasterRequests(
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IN PTRANSPORT Transport,
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IN PUNICODE_STRING MasterName,
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IN NTSTATUS Status
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)
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{
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PIO_STACK_LOCATION IrpSp;
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PIRP Irp = NULL;
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BOOLEAN MasterNameChanged;
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WCHAR MasterNameBuffer[CNLEN+1];
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UNICODE_STRING MasterNameCopy;
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NTSTATUS UcaseStatus;
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PPAGED_TRANSPORT PagedTransport = Transport->PagedTransport;
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PAGED_CODE();
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MasterNameCopy.Buffer = MasterNameBuffer;
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MasterNameCopy.MaximumLength = sizeof(MasterNameBuffer);
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UcaseStatus = RtlUpcaseUnicodeString(&MasterNameCopy, MasterName, FALSE);
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if (!NT_SUCCESS(UcaseStatus)) {
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BowserWriteErrorLogEntry(EVENT_BOWSER_NAME_CONVERSION_FAILED, UcaseStatus, MasterName->Buffer, MasterName->Length, 0);
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return;
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}
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LOCK_TRANSPORT(Transport);
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MasterNameChanged = !RtlEqualUnicodeString(&MasterNameCopy, &PagedTransport->MasterName, FALSE);
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if (MasterNameChanged) {
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//
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// If the master name changed, update the masters name in
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// the transport structure.
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//
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RtlCopyUnicodeString(&PagedTransport->MasterName, &MasterNameCopy);
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}
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UNLOCK_TRANSPORT(Transport);
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do {
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//
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// Complete any the find master requests outstanding against this
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// workstation.
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//
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Irp = BowserDequeueQueuedIrp(&Transport->FindMasterQueue);
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if (MasterNameChanged &&
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(Irp == NULL)) {
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Irp = BowserDequeueQueuedIrp(&Transport->WaitForNewMasterNameQueue);
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}
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if (Irp != NULL) {
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PLMDR_REQUEST_PACKET RequestPacket = Irp->AssociatedIrp.SystemBuffer;
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if (NT_SUCCESS(Status)) {
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IrpSp = IoGetCurrentIrpStackLocation(Irp);
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if (MasterName->Length > (USHORT)(IrpSp->Parameters.DeviceIoControl.OutputBufferLength-
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(FIELD_OFFSET(LMDR_REQUEST_PACKET, Parameters.GetMasterName.Name))+3*sizeof(WCHAR)) ) {
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Status = STATUS_BUFFER_TOO_SMALL;
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} else {
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RequestPacket->Parameters.GetMasterName.Name[0] = L'\\';
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RequestPacket->Parameters.GetMasterName.Name[1] = L'\\';
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RtlCopyMemory(&RequestPacket->Parameters.GetMasterName.Name[2], MasterName->Buffer, MasterName->Length);
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RequestPacket->Parameters.GetMasterName.Name[2+(MasterName->Length/sizeof(WCHAR))] = UNICODE_NULL;
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}
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dprintf(DPRT_MASTER, ("Completing a find master request with new master %ws\n", RequestPacket->Parameters.GetMasterName.Name));
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RequestPacket->Parameters.GetMasterName.MasterNameLength = MasterName->Length+2*sizeof(WCHAR);
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Irp->IoStatus.Information = FIELD_OFFSET(LMDR_REQUEST_PACKET, Parameters.GetMasterName.Name)+MasterName->Length+3*sizeof(WCHAR);
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}
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BowserCompleteRequest(Irp, Status);
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}
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} while ( Irp != NULL );
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}
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DATAGRAM_HANDLER(BowserMasterAnnouncement)
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{
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return BowserPostDatagramToWorkerThread(
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TransportName,
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Buffer,
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BytesAvailable,
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BytesTaken,
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SourceAddress,
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SourceAddressLength,
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SourceName,
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SourceNameLength,
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BowserMasterAnnouncementWorker,
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NonPagedPool,
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DelayedWorkQueue,
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ReceiveFlags,
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FALSE // No response will be sent.
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);
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}
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VOID
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BowserMasterAnnouncementWorker(
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IN PVOID Ctx
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)
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{
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PPOST_DATAGRAM_CONTEXT Context = Ctx;
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PTRANSPORT Transport = Context->TransportName->Transport;
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PCHAR LocalMasterName = (PCHAR)((PMASTER_ANNOUNCEMENT_1)Context->Buffer)->MasterName;
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PIRP Irp;
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NTSTATUS Status;
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PAGED_CODE();
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Irp = BowserDequeueQueuedIrp(&Transport->WaitForMasterAnnounceQueue);
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if (Irp != NULL) {
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PIO_STACK_LOCATION IrpSp;
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PLMDR_REQUEST_PACKET RequestPacket = Irp->AssociatedIrp.SystemBuffer;
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IrpSp = IoGetCurrentIrpStackLocation(Irp);
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|
||
if (strlen(LocalMasterName) * sizeof(WCHAR) > (IrpSp->Parameters.DeviceIoControl.OutputBufferLength-FIELD_OFFSET(LMDR_REQUEST_PACKET, Parameters.WaitForMasterAnnouncement.Name))) {
|
||
|
||
Irp->IoStatus.Information = 0;
|
||
|
||
Status = STATUS_BUFFER_TOO_SMALL;
|
||
} else {
|
||
OEM_STRING MasterName;
|
||
UNICODE_STRING MasterNameU;
|
||
|
||
RtlInitString(&MasterName, LocalMasterName);
|
||
|
||
RtlOemStringToUnicodeString(&MasterNameU, &MasterName, TRUE);
|
||
|
||
RequestPacket->Parameters.WaitForMasterAnnouncement.MasterNameLength = MasterNameU.Length;
|
||
|
||
RtlCopyMemory(RequestPacket->Parameters.WaitForMasterAnnouncement.Name, MasterNameU.Buffer, MasterNameU.Length + sizeof(WCHAR));
|
||
|
||
RequestPacket->Parameters.WaitForMasterAnnouncement.Name[MasterNameU.Length/sizeof(WCHAR)] = UNICODE_NULL;
|
||
|
||
Irp->IoStatus.Information = FIELD_OFFSET(LMDR_REQUEST_PACKET, Parameters.WaitForMasterAnnouncement.Name)+MasterNameU.Length + sizeof(UNICODE_NULL);
|
||
|
||
Status = STATUS_SUCCESS;
|
||
}
|
||
|
||
BowserCompleteRequest(Irp, Status);
|
||
|
||
}
|
||
|
||
BowserDereferenceTransportName(Context->TransportName);
|
||
BowserDereferenceTransport(Transport);
|
||
|
||
InterlockedDecrement( &BowserPostedDatagramCount );
|
||
FREE_POOL(Context);
|
||
|
||
}
|
||
|
||
|
||
NTSTATUS
|
||
TimeoutFindMasterRequests(
|
||
IN PTRANSPORT Transport,
|
||
IN PVOID Context
|
||
)
|
||
{
|
||
|
||
PAGED_CODE();
|
||
|
||
//
|
||
// Perform an unprotected early out to prevent our calling into
|
||
// discardable code section during the scavenger. Since the discardable
|
||
// code section is <4K, touching the code would have the effect of
|
||
// bringing the entire page into memory, which is a waste - since the
|
||
// scavenger runs every 30 seconds, this would cause the discardable
|
||
// code section to be a part of the browsers working set.
|
||
//
|
||
|
||
if (BowserIsIrpQueueEmpty(&Transport->FindMasterQueue)) {
|
||
return STATUS_SUCCESS;
|
||
}
|
||
|
||
BowserTimeoutQueuedIrp(&Transport->FindMasterQueue, BowserFindMasterTimeout);
|
||
|
||
return STATUS_SUCCESS;
|
||
}
|
||
|
||
VOID
|
||
BowserTimeoutFindMasterRequests(
|
||
VOID
|
||
)
|
||
{
|
||
PAGED_CODE();
|
||
|
||
BowserForEachTransport(TimeoutFindMasterRequests, NULL);
|
||
}
|