1 //CreateDevice.c
  2 //2016.07.14
  3
  4 #include "ntddk.h"
  5
  6 //驱动卸载函数Self
  7 VOID MyDriverUnload(PDRIVER_OBJECT pDriverObject)
  8 {
  9     UNICODE_STRING usSymName;
 10     RtlInitUnicodeString(&usSymName, L"\\??\\FirstDevice");
 11
 12     //先删除符号链接，后删除设备对象
 13     if (pDriverObject->DeviceObject != NULL)
 14     {
 15         IoDeleteSymbolicLink(&usSymName);                //删除符号链接
 16         IoDeleteDevice(pDriverObject->DeviceObject);    //删除设备对象
 17         KdPrint(("Delete Device Sucess."));
 18     }
 19 }
 20
 21 //创建设备函数Self
 22 NTSTATUS CreateDevice(PDRIVER_OBJECT pDriverObject)
 23 {
 24     NTSTATUS Status;
 25     UNICODE_STRING usDevName;
 26     UNICODE_STRING usSymName;
 27     PDEVICE_OBJECT pDevObj;        //设备对象，用于指向创建的设备
 28
 29     //DDK API    为UNICODE_STRING赋值的函数
 30     RtlInitUnicodeString(&usDevName, L"\\Device\\FirstDevice");
 31
 32     //创建设备函数API    创建设备"\\Device\\FirstDevice"
 33     //设备创建后，会返回给pDevObj，同时给pDriverObject->DeviceObject赋值
 34     //The IoCreateDevice routine creates a device object for use by a driver.
 35     /*
 36         NTSTATUS IoCreateDevice(
 37         _In_     PDRIVER_OBJECT  DriverObject,
 38         _In_     ULONG           DeviceExtensionSize,
 39         _In_opt_ PUNICODE_STRING DeviceName,
 40         _In_     DEVICE_TYPE     DeviceType,
 41         _In_     ULONG           DeviceCharacteristics,
 42         _In_     BOOLEAN         Exclusive,
 43         _Out_    PDEVICE_OBJECT  *DeviceObject
 44         );
 45     */
 46     Status = IoCreateDevice(pDriverObject,
 47                             0,
 48                             &usDevName,
 49                             FILE_DEVICE_UNKNOWN,
 50                             FILE_DEVICE_SECURE_OPEN,
 51                             TRUE,
 52                             &pDevObj);
 53     if (!NT_SUCCESS(Status))    //检查返回值
 54     {
 55         return Status;
 56     }
 57
 58     //DO_BUFFERED_IO or DO_DIRECT_IO
 59     //Specifies the type of buffering that is used by the I/O manager for I/O requests that are sent to the device stack.
 60     //Higher-level drivers OR this member with the same value as the next-lower driver in the stack, except possibly for highest-level drivers.
 61     pDevObj->Flags |= DO_BUFFERED_IO;
 62
 63     RtlInitUnicodeString(&usSymName, L"\\??\\FirstDevice");
 64
 65     //The IoCreateSymbolicLink routine sets up a symbolic link between a device object name and a user-visible name for the device.
 66     /*
 67         NTSTATUS IoCreateSymbolicLink(
 68         _In_ PUNICODE_STRING SymbolicLinkName,
 69         _In_ PUNICODE_STRING DeviceName
 70         );
 71     */
 72     Status = IoCreateSymbolicLink(&usSymName, &usDevName);    //DDK API    创建符号链接
 73     if (!NT_SUCCESS(Status))
 74     {
 75         IoDeleteDevice(pDevObj);    //删除设备对象
 76         return Status;
 77     }
 78
 79     return STATUS_SUCCESS;
 80 }
 81
 82 //打开设备的函数
 83 NTSTATUS CreateCompleteRoutine(PDRIVER_OBJECT pDriverObject, PIRP pIrp)
 84 {
 85     NTSTATUS Status;
 86
 87     Status = STATUS_SUCCESS;
 88
 89     KdPrint(("Create"));
 90
 91     //A driver sets an IRP's I/O status block to indicate the final status of an I/O request, before calling IoCompleteRequest for the IRP.
 92
 93     //This is the completion status, either STATUS_SUCCESS if the requested operation was completed successfully or an informational, warning, or error STATUS_ XXX value.
 94     //For more information, see Using NTSTATUS values.
 95     pIrp->IoStatus.Status = Status;
 96     //This is the completion status, either STATUS_SUCCESS if the requested operation was completed successfully or an informational, warning, or error STATUS_ XXX value.
 97     //For more information, see Using NTSTATUS values.
 98     pIrp->IoStatus.Information = 0;
 99
100     //The IoCompleteRequest routine indicates that the caller has completed all processing for a given I/O request and is returning the given IRP to the I/O manager.
101     //IO_NO_INCREMENT 不再往下层传递
102     IoCompleteRequest(pIrp, IO_NO_INCREMENT);
103     return Status;
104 }
105
106 //关闭设备的函数
107 NTSTATUS CloseCompleteRoutine(PDRIVER_OBJECT pDriverObject, PIRP pIrp)
108 {
109     NTSTATUS Status;
110
111     Status = STATUS_SUCCESS;
112
113     KdPrint(("Close"));
114
115     pIrp->IoStatus.Status = Status;
116     pIrp->IoStatus.Information = 0;
117
118     IoCompleteRequest(pIrp, IO_NO_INCREMENT);
119     return Status;
120 }
121
122 //读取设备的函数
123 NTSTATUS ReadCompleteRoutine(PDRIVER_OBJECT pDriverObject, PIRP pIrp)
124 {
125     NTSTATUS Status;
126
127     Status = STATUS_SUCCESS;
128
129     KdPrint(("Read"));
130
131     pIrp->IoStatus.Status = Status;
132     pIrp->IoStatus.Information = 0;
133
134     IoCompleteRequest(pIrp, IO_NO_INCREMENT);
135     return Status;
136 }
137
138 //写入设备的函数
139 NTSTATUS WriteCompleteRoutine(PDRIVER_OBJECT pDriverObject, PIRP pIrp)
140 {
141     NTSTATUS Status;
142
143     Status = STATUS_SUCCESS;
144
145     KdPrint(("Write"));
146
147     pIrp->IoStatus.Status = Status;
148     pIrp->IoStatus.Information = 0;
149
150     IoCompleteRequest(pIrp, IO_NO_INCREMENT);
151     return Status;
152 }
153
154 //驱动程序入口函数
155 NTSTATUS DriverEntry(PDRIVER_OBJECT pDriverObject, PUNICODE_STRING pRegistryPath)
156 {
157     //输出信息
158     //DbgPrint("1111");
159
160
161     NTSTATUS Status;
162     Status = CreateDevice(pDriverObject);    //创建设备对象和符号链接
163     if (!NT_SUCCESS(Status))
164     {
165         KdPrint(("Create Device Failed."));
166     } else {
167         KdPrint(("Create Device Sucess."));
168         KdPrint(("%wZ", pRegistryPath));
169     }
170
171     //打开关闭读取写入的分发例程赋值
172     pDriverObject->MajorFunction[IRP_MJ_CREATE] = (PDRIVER_DISPATCH)CreateCompleteRoutine;    //打开设备
173     pDriverObject->MajorFunction[IRP_MJ_CLOSE]    = (PDRIVER_DISPATCH)CloseCompleteRoutine;    //关闭设备
174     pDriverObject->MajorFunction[IRP_MJ_READ]    = (PDRIVER_DISPATCH)ReadCompleteRoutine;    //读取设备
175     pDriverObject->MajorFunction[IRP_MJ_WRITE]    = (PDRIVER_DISPATCH)WriteCompleteRoutine;    //写入设备
176
177     //驱动卸载函数赋值
178     pDriverObject->DriverUnload = MyDriverUnload;
179
180     return STATUS_SUCCESS;
181 }