169 lines
4 KiB
C
169 lines
4 KiB
C
#include <ndis.h>
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#include <ntddndis.h>
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#include <cxport.h>
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#include "gpcifc.h"
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#include "gpcstruc.h"
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/*++
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Copyright (c) 1997 Microsoft Corporation
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Module Name:
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gpcprx.c
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Abstract:
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A GPC proxy to load msgpc.sys on demand
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Author:
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Ofer Bar (Oferbar) Nov 7, 1997
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Environment:
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Kernel Mode
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Revision History:
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--*/
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NTSTATUS
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NTAPI
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ZwLoadDriver(
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IN PUNICODE_STRING Name
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);
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NTSTATUS
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NTAPI
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ZwDeviceIoControlFile(
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IN HANDLE FileHandle,
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IN HANDLE Event OPTIONAL,
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IN PIO_APC_ROUTINE ApcRoutine OPTIONAL,
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IN PVOID ApcContext OPTIONAL,
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OUT PIO_STATUS_BLOCK IoStatusBlock,
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IN ULONG IoControlCode,
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IN PVOID InputBuffer OPTIONAL,
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IN ULONG InputBufferLength,
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OUT PVOID OutputBuffer OPTIONAL,
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IN ULONG OutputBufferLength
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);
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NTSTATUS
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GpcInitialize(
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OUT PGPC_EXPORTED_CALLS pGpcEntries
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)
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{
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NTSTATUS Status;
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OBJECT_ATTRIBUTES ObjAttr;
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HANDLE FileHandle;
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IO_STATUS_BLOCK IoStatusBlock;
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UNICODE_STRING DriverName;
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UNICODE_STRING DeviceName;
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ASSERT(pGpcEntries);
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RtlZeroMemory(pGpcEntries, sizeof(GPC_EXPORTED_CALLS));
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RtlInitUnicodeString(&DriverName,
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L"\\Registry\\Machine\\System\\CurrentControlSet\\Services\\Gpc");
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RtlInitUnicodeString(&DeviceName, DD_GPC_DEVICE_NAME);
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InitializeObjectAttributes(&ObjAttr,
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&DeviceName,
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0,
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NULL,
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NULL
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);
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Status = ZwCreateFile(
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&FileHandle,
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GENERIC_READ | GENERIC_WRITE,
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&ObjAttr,
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&IoStatusBlock,
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0, // AllocationSize
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FILE_ATTRIBUTE_NORMAL, // FileAttributes
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0, // ShareAccess
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FILE_OPEN_IF, // CreateDisposition
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0, // CreateOptions
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NULL, // EaBuffer
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0 // EaLength
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);
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if (Status != STATUS_SUCCESS) {
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//
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// The GPC is not loaded yet, so we need to load it now
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//
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Status = ZwLoadDriver(&DriverName);
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if (Status != STATUS_SUCCESS) {
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return Status;
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}
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//
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// try again...
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//
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Status = ZwCreateFile(&FileHandle,
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GENERIC_READ | GENERIC_WRITE,
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&ObjAttr,
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&IoStatusBlock,
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0, // AllocationSize
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FILE_ATTRIBUTE_NORMAL, // FileAttributes
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0, // ShareAccess
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FILE_OPEN_IF, // CreateDisposition
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0, // CreateOptions
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NULL, // EaBuffer
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0 // EaLength
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);
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if (Status != STATUS_SUCCESS) {
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return Status;
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}
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}
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Status = ZwDeviceIoControlFile(FileHandle,
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NULL, // Event
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NULL, // ApcRoutine
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NULL, // ApcContext
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&IoStatusBlock,
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IOCTL_GPC_GET_ENTRIES,
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NULL,
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0,
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(PVOID)pGpcEntries,
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sizeof(GPC_EXPORTED_CALLS)
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);
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pGpcEntries->Reserved = FileHandle;
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return Status;
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}
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NTSTATUS
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GpcDeinitialize(
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IN PGPC_EXPORTED_CALLS pGpcEntries
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)
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{
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NTSTATUS Status;
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Status = ZwClose(pGpcEntries->Reserved);
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if (NT_SUCCESS(Status)) {
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RtlZeroMemory(pGpcEntries, sizeof(GPC_EXPORTED_CALLS));
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}
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return Status;
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}
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