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294 lines
7.7 KiB
294 lines
7.7 KiB
/*++
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Copyright (c) 1995-96 Microsoft Corporation
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Module Name:
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ssets.hxx
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Abstract:
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CServerSet objects represent sets of CServerOids which are owned by
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a particular client. The same CServerOids may appear in a large
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number of sets.
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CServerSets are mangaged by an instance of the CServerSetTable
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class. This object (pServerSets) can be used to allocate (exclusive lock)
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and lookup (shared lock) sets. It can also be used (shared lock) by
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the worker thread to rundowns old CServerSet's.
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Author:
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Mario Goertzel [MarioGo]
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Revision History:
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MarioGo 02-27-95 Bits 'n pieces
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MarioGo 04-04-95 Split client and server.
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MarioGo 01-06-96 Locally unique Ids, added new management class
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--*/
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#ifndef __SSET_HXX
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#define __SSET_HXX
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class CServerSet
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/*++
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Class Description:
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Each instance for this class represtents a set of oids which are being
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used by a particular client. This client may or may not be making secure
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calls to this objext resolver. If the calls are secure, the SID of the
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client is remembered and compared during any operation changing the
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contents of the set.
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Members:
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_timeout - The time at which this set should rundown.
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_blistOids - List of pointers to all the CServerOids in this set.
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_psid - Security ID of the client. NULL for non-secure set.
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_sequence - The sequence number of the last good ping. Used to
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avoid problems with multiple execution since pings are idempotent.
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_period - Power of two multipler for timeout period. Not implemented.
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_psid - Pointer to the sid of the client or NULL.
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_fLocal - (need 1 bit) non-zero if the client is on this machine.
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--*/
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{
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private:
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CTime _timeout;
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PSID _psid;
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CBList _blistOids;
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USHORT _sequence;
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USHORT _pings;
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USHORT _fLocal:8; // free bits
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// Free USHORT
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BOOL ValidateObjects(BOOL fShared);
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public:
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CServerSet(USHORT sequence,
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PSID psid,
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BOOL fLocal) :
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_blistOids(8),
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_sequence(sequence - 1),
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_psid(psid),
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_fLocal((USHORT) fLocal)
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{
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_timeout += BaseTimeoutInterval; // * factor
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}
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~CServerSet()
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{
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#if DBG
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CTime now;
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ASSERT(now > _timeout);
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#endif
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if (!_fLocal)
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{
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ASSERT(gpPingSetQuotaManager);
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gpPingSetQuotaManager->ManageQuotaForUser(_psid, FALSE);
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}
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delete _psid;
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}
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BOOL
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Ping(BOOL fShared)
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{
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_timeout.SetNow();
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_timeout += BaseTimeoutInterval; // * factor
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_pings++;
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if (_pings % BaseNumberOfPings == 0)
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{
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return(ValidateObjects(fShared));
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}
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return(fShared);
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}
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BOOL
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CheckAndUpdateSequenceNumber(USHORT sequence)
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{
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// note: this handles overflow cases, too.
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USHORT diff = sequence - _sequence;
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if (diff && diff <= BaseNumberOfPings)
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{
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_sequence = sequence;
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return(TRUE);
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}
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return(FALSE);
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}
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BOOL
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CheckSecurity(HANDLE hRpc)
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{
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// Local calls are secure
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if (0 == hRpc)
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{
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ASSERT(0 == _psid );
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return(TRUE);
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}
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// No security on the set
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if (0 == _psid)
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{
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return(TRUE);
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}
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BOOL f;
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RPC_STATUS status;
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HANDLE hT;
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status = RpcImpersonateClient(hRpc);
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if (status == RPC_S_OK)
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{
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f = OpenThreadToken(GetCurrentThread(),
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TOKEN_IMPERSONATE | TOKEN_QUERY,
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TRUE,
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&hT);
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if (!f)
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{
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return(FALSE);
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}
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}
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else
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{
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#if DBG
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SetLastError(status);
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#endif
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return(FALSE);
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}
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ULONG needed = DEBUG_MIN(1, 24);
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PTOKEN_USER ptu;
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do
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{
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ptu = (PTOKEN_USER)alloca(needed);
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ASSERT(ptu);
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f = GetTokenInformation(hT,
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TokenUser,
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(PBYTE)ptu,
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needed,
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&needed);
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}
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while( FALSE == f && GetLastError() == ERROR_INSUFFICIENT_BUFFER);
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CloseHandle(hT);
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if (FALSE != f)
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{
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ASSERT(needed > sizeof(SID));
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f = EqualSid(_psid, ptu->User.Sid);
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return(f);
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}
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return(FALSE);
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}
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ORSTATUS AddObject(OID &oid);
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void RemoveObject(OID &oid);
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BOOL ShouldRundown() { CTime now; return(now > _timeout); }
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BOOL Rundown();
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};
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class CServerSetTable
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/*++
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Class Description:
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Management class for allocating and looking up CServerSets.
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Each set is associated with an ID which is made up of an index
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and a sequence number. The index is used to index into _pElements
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and the sequence number is used to avoid problems with old set ID
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and a new server.
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Members:
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_pElements - An array (size _cMax) of IndexElement structures
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IndexElement-
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_sequence - A sequence number used to detect invalid
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referneces to a slot which has rundown and been realloc'd.
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_pSet - A pointer to the actual CServerSet. If the
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slot is free it is 0x80000000 & index of next free slot.
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_cMax - The number of slots in _pElements.
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_cAllocated - The number of slots in use.
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_iFirstFree - (Hint) A starting place of where to look when trying
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to insert. No elements < _iFirstFree are free.
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_iRundown - Index of the rundown checker. It is written
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to with a shared lock held. This is okay.
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--*/
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{
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struct IndexElement {
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DWORD _sequence;
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CServerSet *_pSet;
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};
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public:
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CServerSetTable(ORSTATUS &status) :
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_cMax(DEBUG_MIN(16,4)),
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_cAllocated(0),
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_iFirstFree(0),
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_iRundown(0)
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{
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_pElements = new IndexElement[_cMax];
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if (!_pElements)
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{
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status = OR_NOMEM;
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}
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else
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{
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status = OR_OK;
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OrMemorySet(_pElements, 0, sizeof(IndexElement) * _cMax);
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for(UINT i = 0; i < _cMax; i++)
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{
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if FAILED(gRNG.GenerateRandomNumber(&(_pElements[i]._sequence), sizeof(_pElements[i]._sequence)))
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{
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status = OR_NOMEM;
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break;
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}
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}
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}
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}
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CServerSet *Allocate(IN USHORT sequence,
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IN PSID psid,
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IN BOOL fLocal,
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OUT ID &setid);
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CServerSet *Lookup(IN ID setid);
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DWORD Size() {
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return(_cAllocated);
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}
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// Used for set cleanup by worker and SimplePing.
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ID CheckForRundowns();
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BOOL RundownSetIfNeeded(SETID id);
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void PingAllSets();
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private:
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IndexElement *_pElements;
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DWORD _cMax;
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DWORD _cAllocated;
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DWORD _iFirstFree;
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DWORD _iRundown;
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};
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#endif // __SSET_HXX
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