mirror of
https://github.com/reactos/reactos.git
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146 lines
4 KiB
C
146 lines
4 KiB
C
/*
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* PROJECT: ReactOS RPC Subsystem Service
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* LICENSE: GPL-2.0+ (https://spdx.org/licenses/GPL-2.0+)
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* PURPOSE: UUID initialization.
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* COPYRIGHT: Copyright 2019 Pierre Schweitzer
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*/
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/* INCLUDES *****************************************************************/
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/* PSDK/NDK Headers */
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#define WIN32_NO_STATUS
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#include <windef.h>
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#include <winbase.h>
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#include <winreg.h>
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#include <winsvc.h>
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#include <ntddndis.h>
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#include <ndk/exfuncs.h>
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#include <ntsecapi.h>
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#define NDEBUG
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#include <debug.h>
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#define SEED_BUFFER_SIZE 6
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/* FUNCTIONS ****************************************************************/
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static BOOLEAN
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getMacAddress(UCHAR * MacAddress)
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{
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/* FIXME: query NDIS for all the interfaces */
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UNIMPLEMENTED;
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return FALSE;
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}
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static VOID
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CookupNodeId(UCHAR * NodeId)
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{
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CHAR ComputerName[MAX_COMPUTERNAME_LENGTH + 1];
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CHAR * CurrentChar;
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DWORD Size;
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LARGE_INTEGER PerformanceCount;
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PDWORD NodeBegin, NodeMiddle;
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DWORD dwValue;
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MEMORYSTATUS MemoryStatus;
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LUID Luid;
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WCHAR szSystem[MAX_PATH];
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ULARGE_INTEGER FreeBytesToCaller, TotalBytes, TotalFreeBytes;
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/* Initialize node id */
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memset(NodeId, 0x11, SEED_BUFFER_SIZE * sizeof(UCHAR));
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/* Randomize it with computer name */
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Size = MAX_COMPUTERNAME_LENGTH + 1;
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if (GetComputerNameA(ComputerName, &Size))
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{
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Size = 0;
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CurrentChar = &ComputerName[0];
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while (*CurrentChar != ANSI_NULL)
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{
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NodeId[Size] ^= *CurrentChar;
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++CurrentChar;
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/* Don't overflow our NodeId */
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if (++Size >= SEED_BUFFER_SIZE)
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{
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Size = 0;
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}
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}
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}
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/* Now, we'll work directly on DWORD values */
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NodeBegin = (DWORD *)&NodeId[0];
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NodeMiddle = (DWORD *)&NodeId[2];
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/* Randomize with performance counter */
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if (QueryPerformanceCounter(&PerformanceCount))
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{
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*NodeMiddle = *NodeMiddle ^ PerformanceCount.u.HighPart ^ PerformanceCount.u.LowPart;
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dwValue = PerformanceCount.u.HighPart ^ PerformanceCount.u.LowPart ^ *NodeBegin;
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}
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else
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{
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dwValue = *NodeBegin;
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}
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*NodeBegin = *NodeBegin ^ dwValue;
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*NodeMiddle = *NodeMiddle ^ *NodeBegin;
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/* Then, with memory status */
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MemoryStatus.dwLength = sizeof(MemoryStatus);
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GlobalMemoryStatus(&MemoryStatus);
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*NodeBegin = *NodeBegin ^ MemoryStatus.dwMemoryLoad;
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*NodeMiddle = *NodeMiddle ^ MemoryStatus.dwTotalPhys;
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*NodeBegin = *NodeBegin ^ MemoryStatus.dwTotalPageFile ^ MemoryStatus.dwAvailPhys;
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*NodeMiddle = *NodeMiddle ^ MemoryStatus.dwTotalVirtual ^ MemoryStatus.dwAvailPageFile;
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*NodeBegin = *NodeBegin ^ MemoryStatus.dwAvailVirtual;
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/* With a LUID */
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if (AllocateLocallyUniqueId(&Luid))
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{
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*NodeBegin = *NodeBegin ^ Luid.LowPart;
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*NodeMiddle = *NodeMiddle ^ Luid.HighPart;
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}
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/* Get system directory */
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GetSystemDirectoryW(szSystem, ARRAYSIZE(szSystem));
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/* And finally with free disk space */
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if (GetDiskFreeSpaceExW(szSystem, &FreeBytesToCaller, &TotalBytes, &TotalFreeBytes))
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{
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*NodeMiddle ^= FreeBytesToCaller.LowPart ^ TotalFreeBytes.HighPart;
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*NodeMiddle ^= FreeBytesToCaller.HighPart ^ TotalFreeBytes.LowPart;
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*NodeBegin ^= TotalBytes.LowPart ^ TotalFreeBytes.LowPart;
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*NodeBegin ^= TotalBytes.HighPart ^ TotalFreeBytes.HighPart;
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}
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/*
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* Because it was locally generated, force the seed to be local
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* setting this, will trigger the check for validness in the kernel
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* and make the seed local
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*/
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NodeId[0] |= 0x80u;
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}
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VOID DealWithDeviceEvent(VOID)
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{
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NTSTATUS Status;
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UCHAR UuidSeed[SEED_BUFFER_SIZE];
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/* First, try to get a multicast MAC address */
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if (!getMacAddress(UuidSeed))
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{
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DPRINT1("Failed finding a proper MAC address, will generate seed\n");
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CookupNodeId(UuidSeed);
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}
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/* Seed our UUID generator */
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Status = NtSetUuidSeed(UuidSeed);
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if (!NT_SUCCESS(Status))
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{
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DPRINT1("NtSetUuidSeed failed with status: %lx\n", Status);
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}
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}
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