This header initiates a device control request. This message has different interpretations depending on the device for which it is issued. The device type is determined by the DeviceId field in the DR_DEVICE_IOREQUEST header.
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DeviceIoRequest
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OutputBufferLength
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InputBufferLength
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IoControlCode
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Padding
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InputBuffer (variable)
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DeviceIoRequest (24 bytes): A DR_DEVICE_IOREQUEST header. The MajorFunction field in this header MUST be set to IRP_MJ_DEVICE_CONTROL.
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OutputBufferLength (4 bytes): A 32-bit unsigned integer that specifies the maximum number of bytes expected in the OutputBuffer field of the Device Control Response (section 2.2.1.5.5).
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InputBufferLength (4 bytes): A 32-bit unsigned integer that specifies the number of bytes in the InputBuffer field.
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IoControlCode (4 bytes): A 32-bit unsigned integer. This field is specific to the redirected device.
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Padding (20 bytes): An array of 20 bytes. Reserved. This field MAY be set to any value, and MUST be ignored on receipt.
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InputBuffer (variable): A variable-size byte array whose size is specified by the InputBufferLength field.