[DCOMLAUNCH] Add a DcomLaunch service stub

This stub is responsible for providing the UUID seed to the kernel. For now, it generates a purely random seed - MAC address support is to be added. Because it's purely random seed and local the machine (not tied to the MAC address) it's made so that ExUuidCreate keeps returning RPC_NT_UUID_LOCAL_ONLY. It won't fix failing test for now. Nota: this service shouldn't exist as it. It should be implemented though rpcss DLL for both rpcss service (network service) and dcomlaunch service (local system service). Because rpcss is EXE based and wine-synced for now, I prefered stubbing a new service. This will have to be changed at some point.
2025-07-31 06:41:58 +00:00 · 2019-03-03 14:21:46 +01:00 · 2019-03-03 14:21:46 +01:00 · 2ab289a34a
commit 2ab289a34a
parent 1d7287288d
8 changed files with 324 additions and 1 deletions
--- a/base/services/dcomlaunch/network.c
+++ b/base/services/dcomlaunch/network.c
@ -0,0 +1,140 @@
+/*
+ * PROJECT:     ReactOS RPC Subsystem Service
+ * LICENSE:     GPL-2.0+ (https://spdx.org/licenses/GPL-2.0+)
+ * PURPOSE:     UUID initialization.
+ * COPYRIGHT:   Copyright 2019 Pierre Schweitzer
+ */
+
+/* INCLUDES *****************************************************************/
+
+/* PSDK/NDK Headers */
+#define WIN32_NO_STATUS
+#include <windef.h>
+#include <winbase.h>
+#include <winreg.h>
+#include <winsvc.h>
+#include <ntddndis.h>
+
+#include <ndk/exfuncs.h>
+#include <ntsecapi.h>
+
+#define NDEBUG
+#include <debug.h>
+
+#define SEED_BUFFER_SIZE 6
+
+/* FUNCTIONS ****************************************************************/
+
+static BOOLEAN
+getMacAddress(UCHAR * MacAddress)
+{
+    /* FIXME: query NDIS for all the interfaces */
+    UNIMPLEMENTED;
+    return FALSE;
+}
+
+static VOID
+CookupNodeId(UCHAR * NodeId)
+{
+    CHAR ComputerName[MAX_COMPUTERNAME_LENGTH + 1];
+    CHAR * CurrentChar;
+    DWORD Size;
+    LARGE_INTEGER PerformanceCount;
+    PDWORD NodeBegin, NodeMiddle;
+    DWORD dwValue;
+    MEMORYSTATUS MemoryStatus;
+    LUID Luid;
+    DWORD SectorsPerCluster, BytesPerSector, NumberOfFreeClusters, TotalNumberOfClusters;
+
+    /* Initialize node id */
+    memset(NodeId, 0x11, SEED_BUFFER_SIZE * sizeof(UCHAR));
+
+    /* Randomize it with computer name */
+    Size = MAX_COMPUTERNAME_LENGTH + 1;
+    if (GetComputerNameA(ComputerName, &Size))
+    {
+        Size = 0;
+        CurrentChar = &ComputerName[0];
+        while (*CurrentChar != ANSI_NULL)
+        {
+            NodeId[Size] ^= *CurrentChar;
+            ++CurrentChar;
+
+            /* Don't overflow our NodeId */
+            if (++Size >= SEED_BUFFER_SIZE)
+            {
+                Size = 0;
+            }
+        }
+    }
+
+    /* Now, we'll work directly on DWORD values */
+    NodeBegin = (DWORD *)&NodeId[0];
+    NodeMiddle = (DWORD *)&NodeId[2];
+
+    /* Randomize with performance counter */
+    if (QueryPerformanceCounter(&PerformanceCount))
+    {
+        *NodeMiddle = *NodeMiddle ^ PerformanceCount.u.HighPart ^ PerformanceCount.u.LowPart;
+
+        dwValue = PerformanceCount.u.HighPart ^ PerformanceCount.u.LowPart ^ *NodeBegin;
+    }
+    else
+    {
+        dwValue = *NodeBegin;
+    }
+
+    *NodeBegin = *NodeBegin ^ dwValue;
+    *NodeMiddle = *NodeMiddle ^ *NodeBegin;
+
+    /* Then, with memory status */
+    MemoryStatus.dwLength = sizeof(MemoryStatus);
+    GlobalMemoryStatus(&MemoryStatus);
+
+    *NodeBegin = *NodeBegin ^ MemoryStatus.dwMemoryLoad;
+    *NodeMiddle = *NodeMiddle ^ MemoryStatus.dwTotalPhys;
+    *NodeBegin = *NodeBegin ^ MemoryStatus.dwTotalPageFile ^ MemoryStatus.dwAvailPhys;
+    *NodeMiddle = *NodeMiddle ^ MemoryStatus.dwTotalVirtual ^ MemoryStatus.dwAvailPageFile;
+    *NodeBegin = *NodeBegin ^ MemoryStatus.dwAvailVirtual;
+
+    /* With a LUID */
+    if (AllocateLocallyUniqueId(&Luid))
+    {
+        *NodeBegin = *NodeBegin ^ Luid.LowPart;
+        *NodeMiddle = *NodeMiddle ^ Luid.HighPart;
+    }
+
+    /* And finally with free disk space */
+    if (GetDiskFreeSpaceA("c:\\", &SectorsPerCluster, &BytesPerSector, &NumberOfFreeClusters, &TotalNumberOfClusters))
+    {
+        *NodeMiddle = *NodeMiddle ^ TotalNumberOfClusters * BytesPerSector * SectorsPerCluster;
+        *NodeBegin = *NodeBegin ^ NumberOfFreeClusters * BytesPerSector * SectorsPerCluster;
+    }
+
+    /*
+     * Because it was locally generated, force the seed to be local
+     * setting this, will trigger the check for validness in the kernel
+     * and make the seed local
+     */
+    NodeId[0] |= 0x80u;
+}
+
+VOID DealWithDeviceEvent(VOID)
+{
+    NTSTATUS Status;
+    UCHAR UuidSeed[SEED_BUFFER_SIZE];
+
+    /* First, try to get a multicast MAC address */
+    if (!getMacAddress(UuidSeed))
+    {
+        DPRINT1("Failed finding a proper MAC address, will generate seed\n");
+        CookupNodeId(UuidSeed);
+    }
+
+    /* Seed our UUID generator */
+    Status = NtSetUuidSeed(UuidSeed);
+    if (!NT_SUCCESS(Status))
+    {
+        DPRINT1("NtSetUuidSeed failed with status: %lx\n", Status);
+    }
+}