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139 lines
4.8 KiB
C
139 lines
4.8 KiB
C
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS TDI interface
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* FILE: enum.c
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* PURPOSE: TDI entity enumeration
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*/
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#include "precomp.h"
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#include "tdilib.h"
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/* A generic thing-getting function which interacts in the right way with
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* TDI. This may seem oblique, but I'm using it to reduce code and hopefully
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* make this thing easier to debug.
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*
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* The things returned can be any of:
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* TDIEntityID
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* TDIObjectID
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* IFEntry
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* IPSNMPInfo
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* IPAddrEntry
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* IPInterfaceInfo
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*/
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NTSTATUS tdiGetSetOfThings( HANDLE tcpFile,
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DWORD toiClass,
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DWORD toiType,
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DWORD toiId,
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DWORD teiEntity,
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DWORD teiInstance,
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DWORD fixedPart,
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DWORD entrySize,
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PVOID *tdiEntitySet,
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PDWORD numEntries ) {
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TCP_REQUEST_QUERY_INFORMATION_EX req = TCP_REQUEST_QUERY_INFORMATION_INIT;
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PVOID entitySet = 0;
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NTSTATUS status = STATUS_SUCCESS;
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DWORD allocationSizeForEntityArray = entrySize * MAX_TDI_ENTITIES;
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IO_STATUS_BLOCK Iosb;
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req.ID.toi_class = toiClass;
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req.ID.toi_type = toiType;
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req.ID.toi_id = toiId;
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req.ID.toi_entity.tei_entity = teiEntity;
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req.ID.toi_entity.tei_instance = teiInstance;
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/* There's a subtle problem here...
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* If an interface is added at this exact instant, (as if by a PCMCIA
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* card insertion), the array will still not have enough entries after
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* have allocated it after the first DeviceIoControl call.
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*
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* We'll get around this by repeating until the number of interfaces
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* stabilizes.
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*/
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do {
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status = NtDeviceIoControlFile( tcpFile,
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NULL,
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NULL,
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NULL,
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&Iosb,
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IOCTL_TCP_QUERY_INFORMATION_EX,
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&req,
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sizeof(req),
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NULL,
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0);
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if (status == STATUS_PENDING)
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{
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status = NtWaitForSingleObject(tcpFile, FALSE, NULL);
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if (NT_SUCCESS(status)) status = Iosb.Status;
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}
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if(!NT_SUCCESS(status))
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{
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return status;
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}
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allocationSizeForEntityArray = Iosb.Information;
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entitySet = HeapAlloc( GetProcessHeap(), 0, allocationSizeForEntityArray );
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if( !entitySet ) {
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status = STATUS_INSUFFICIENT_RESOURCES;
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return status;
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}
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status = NtDeviceIoControlFile( tcpFile,
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NULL,
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NULL,
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NULL,
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&Iosb,
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IOCTL_TCP_QUERY_INFORMATION_EX,
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&req,
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sizeof(req),
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entitySet,
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allocationSizeForEntityArray);
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if (status == STATUS_PENDING)
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{
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status = NtWaitForSingleObject(tcpFile, FALSE, NULL);
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if (NT_SUCCESS(status)) status = Iosb.Status;
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}
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/* This is why we have the loop -- we might have added an adapter */
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if( Iosb.Information == allocationSizeForEntityArray )
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break;
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HeapFree( GetProcessHeap(), 0, entitySet );
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entitySet = 0;
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if(!NT_SUCCESS(status))
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return status;
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} while( TRUE ); /* We break if the array we received was the size we
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* expected. Therefore, we got here because it wasn't */
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*numEntries = (allocationSizeForEntityArray - fixedPart) / entrySize;
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*tdiEntitySet = entitySet;
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return STATUS_SUCCESS;
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}
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VOID tdiFreeThingSet( PVOID things ) {
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HeapFree( GetProcessHeap(), 0, things );
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}
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NTSTATUS tdiGetEntityIDSet( HANDLE tcpFile,
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TDIEntityID **entitySet,
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PDWORD numEntities ) {
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NTSTATUS status = tdiGetSetOfThings( tcpFile,
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INFO_CLASS_GENERIC,
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INFO_TYPE_PROVIDER,
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ENTITY_LIST_ID,
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GENERIC_ENTITY,
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0,
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0,
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sizeof(TDIEntityID),
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(PVOID *)entitySet,
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numEntities );
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return status;
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}
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