1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
|
/*++
Copyright (c) 1999 - 2002 Microsoft Corporation
Module Name:
nullFilter.c
Abstract:
This is the main module of the nullFilter mini filter driver.
It is a simple minifilter that registers itself with the main filter
for no callback operations.
Environment:
Kernel mode
--*/
#include <fltKernel.h>
#include <dontuse.h>
#include <suppress.h>
#pragma prefast(disable:__WARNING_ENCODE_MEMBER_FUNCTION_POINTER, "Not valid for kernel mode drivers")
//---------------------------------------------------------------------------
// Global variables
//---------------------------------------------------------------------------
#define NULL_FILTER_FILTER_NAME L"NullFilter"
typedef struct _NULL_FILTER_DATA {
//
// The filter handle that results from a call to
// FltRegisterFilter.
//
PFLT_FILTER FilterHandle;
} NULL_FILTER_DATA, *PNULL_FILTER_DATA;
/*************************************************************************
Prototypes for the startup and unload routines used for
this Filter.
Implementation in nullFilter.c
*************************************************************************/
DRIVER_INITIALIZE DriverEntry;
NTSTATUS
DriverEntry (
_In_ PDRIVER_OBJECT DriverObject,
_In_ PUNICODE_STRING RegistryPath
);
NTSTATUS
NullUnload (
_In_ FLT_FILTER_UNLOAD_FLAGS Flags
);
NTSTATUS
NullQueryTeardown (
_In_ PCFLT_RELATED_OBJECTS FltObjects,
_In_ FLT_INSTANCE_QUERY_TEARDOWN_FLAGS Flags
);
//
// Structure that contains all the global data structures
// used throughout NullFilter.
//
NULL_FILTER_DATA NullFilterData;
//
// Assign text sections for each routine.
//
#ifdef ALLOC_PRAGMA
#pragma alloc_text(INIT, DriverEntry)
#pragma alloc_text(PAGE, NullUnload)
#pragma alloc_text(PAGE, NullQueryTeardown)
#endif
//
// This defines what we want to filter with FltMgr
//
CONST FLT_REGISTRATION FilterRegistration = {
sizeof( FLT_REGISTRATION ), // Size
FLT_REGISTRATION_VERSION, // Version
0, // Flags
NULL, // Context
NULL, // Operation callbacks
NullUnload, // FilterUnload
NULL, // InstanceSetup
NullQueryTeardown, // InstanceQueryTeardown
NULL, // InstanceTeardownStart
NULL, // InstanceTeardownComplete
NULL, // GenerateFileName
NULL, // GenerateDestinationFileName
NULL // NormalizeNameComponent
};
/*************************************************************************
Filter initialization and unload routines.
*************************************************************************/
NTSTATUS
DriverEntry (
_In_ PDRIVER_OBJECT DriverObject,
_In_ PUNICODE_STRING RegistryPath
)
/*++
Routine Description:
This is the initialization routine for this miniFilter driver. This
registers the miniFilter with FltMgr and initializes all
its global data structures.
Arguments:
DriverObject - Pointer to driver object created by the system to
represent this driver.
RegistryPath - Unicode string identifying where the parameters for this
driver are located in the registry.
Return Value:
Returns STATUS_SUCCESS.
--*/
{
NTSTATUS status;
UNREFERENCED_PARAMETER( RegistryPath );
//
// Register with FltMgr
//
status = FltRegisterFilter( DriverObject,
&FilterRegistration,
&NullFilterData.FilterHandle );
FLT_ASSERT( NT_SUCCESS( status ) );
if (NT_SUCCESS( status )) {
//
// Start filtering i/o
//
status = FltStartFiltering( NullFilterData.FilterHandle );
if (!NT_SUCCESS( status )) {
FltUnregisterFilter( NullFilterData.FilterHandle );
}
}
return status;
}
NTSTATUS
NullUnload (
_In_ FLT_FILTER_UNLOAD_FLAGS Flags
)
/*++
Routine Description:
This is the unload routine for this miniFilter driver. This is called
when the minifilter is about to be unloaded. We can fail this unload
request if this is not a mandatory unloaded indicated by the Flags
parameter.
Arguments:
Flags - Indicating if this is a mandatory unload.
Return Value:
Returns the final status of this operation.
--*/
{
UNREFERENCED_PARAMETER( Flags );
PAGED_CODE();
FltUnregisterFilter( NullFilterData.FilterHandle );
return STATUS_SUCCESS;
}
NTSTATUS
NullQueryTeardown (
_In_ PCFLT_RELATED_OBJECTS FltObjects,
_In_ FLT_INSTANCE_QUERY_TEARDOWN_FLAGS Flags
)
/*++
Routine Description:
This is the instance detach routine for this miniFilter driver.
This is called when an instance is being manually deleted by a
call to FltDetachVolume or FilterDetach thereby giving us a
chance to fail that detach request.
Arguments:
FltObjects - Pointer to the FLT_RELATED_OBJECTS data structure containing
opaque handles to this filter, instance and its associated volume.
Flags - Indicating where this detach request came from.
Return Value:
Returns the status of this operation.
--*/
{
UNREFERENCED_PARAMETER( FltObjects );
UNREFERENCED_PARAMETER( Flags );
PAGED_CODE();
return STATUS_SUCCESS;
}
|
