2.2.1.4 Device I/O Request (DR_DEVICE_IOREQUEST)
This header is embedded in all server requests on a specific device.
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Header |
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DeviceId |
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FileId |
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CompletionId |
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MajorFunction |
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MinorFunction |
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Header (4 bytes): An RDPDR_HEADER header. The Component field MUST be set to RDPDR_CTYP_CORE, and the PacketId field MUST be set to PAKID_CORE_DEVICE_IOREQUEST.
DeviceId (4 bytes): A 32-bit unsigned integer that is a unique ID. The value MUST match the DeviceId value in the Client Device List Announce Request (section 2.2.2.9).
FileId (4 bytes): A 32-bit unsigned integer that specifies a unique ID retrieved from the Device Create Response (section 2.2.1.5.1).
CompletionId (4 bytes): A 32-bit unsigned integer that specifies a unique ID for each request. The ID is considered valid until a Device I/O Response (section 2.2.1.5) is received. Subsequently, the ID MUST be reused.
MajorFunction (4 bytes): A 32-bit unsigned integer that identifies the request function. This field MUST have one of the following values.
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Value
Meaning
IRP_MJ_CREATE
0x00000000
Create request
IRP_MJ_CLOSE
0x00000002
Close request
IRP_MJ_READ
0x00000003
Read request
IRP_MJ_WRITE
0x00000004
Write request
IRP_MJ_DEVICE_CONTROL
0x0000000E
Device control request
IRP_MJ_QUERY_VOLUME_INFORMATION
0x0000000A
Query volume information request
IRP_MJ_SET_VOLUME_INFORMATION
0x0000000B
Set volume information request
IRP_MJ_QUERY_INFORMATION
0x00000005
Query information request
IRP_MJ_SET_INFORMATION
0x00000006
Set information request
IRP_MJ_DIRECTORY_CONTROL
0x0000000C
Directory control request
IRP_MJ_LOCK_CONTROL
0x00000011
File lock control request
MinorFunction (4 bytes): A 32-bit unsigned integer. This field is valid only when the MajorFunction field is set to IRP_MJ_DIRECTORY_CONTROL. If the MajorFunction field is set to another value, the MinorFunction field value SHOULD be 0x00000000;<5> otherwise, the MinorFunction field MUST have one of the following values.
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Value
Meaning
IRP_MN_QUERY_DIRECTORY
0x00000001
Query directory request
IRP_MN_NOTIFY_CHANGE_DIRECTORY
0x00000002
Notify change directory request