audk/MdeModulePkg/Universal/Network/IScsiDxe/IScsiInitiatorName.c

/** @file
  Implementation for EFI iSCSI Initiator Name Protocol.

Copyright (c) 2004 - 2008, Intel Corporation
All rights reserved. This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution.  The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php

THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

Module Name:

  IScsiInitiatorName.c

Abstract:

  Implementation for EFI iSCSI Initiator Name Protocol.

**/

#include "IScsiImpl.h"

EFI_ISCSI_INITIATOR_NAME_PROTOCOL gIScsiInitiatorName = {
  IScsiGetInitiatorName,
  IScsiSetInitiatorName
};

/**
  Retrieves the current set value of iSCSI Initiator Name. 

  @param  This[in]              Pointer to the EFI_ISCSI_INITIATOR_NAME_PROTOCOL instance.

  @param  BufferSize[in][out]   Size of the buffer in bytes pointed to by Buffer / Actual
                                size of the variable data buffer.

  @param  Buffer[out]           Pointer to the buffer for data to be read.

  @retval EFI_SUCCESS           Data was successfully retrieved into the provided 
                                buffer and the BufferSize was sufficient to handle the
                                iSCSI initiator name.
  @retval EFI_BUFFER_TOO_SMALL  BufferSize is too small for the result. BufferSize will
                                be updated with the size required to complete the request.
                                Buffer will not be affected.

  @retval EFI_INVALID_PARAMETER BufferSize is NULL. BufferSize and Buffer will not be
                                affected.

  @retval EFI_INVALID_PARAMETER Buffer is NULL. BufferSize and Buffer will not be
                                affected.

  @retval EFI_DEVICE_ERROR      The iSCSI initiator name could not be retrieved due to
                                a hardware error.

**/
EFI_STATUS
EFIAPI
IScsiGetInitiatorName (
  IN     EFI_ISCSI_INITIATOR_NAME_PROTOCOL  *This,
  IN OUT UINTN                              *BufferSize,
  OUT    VOID                               *Buffer
  )
{
  EFI_STATUS  Status;

  if ((BufferSize == NULL) || (Buffer == NULL)) {
    return EFI_INVALID_PARAMETER;
  }

  Status = gRT->GetVariable (
                  ISCSI_INITIATOR_NAME_VAR_NAME,
                  &gEfiIScsiInitiatorNameProtocolGuid,
                  NULL,
                  BufferSize,
                  Buffer
                  );

  return Status;
}

/**
  Sets the iSCSI Initiator Name. 

  @param  This[in]              Pointer to the EFI_ISCSI_INITIATOR_NAME_PROTOCOL instance.

  @param  BufferSize[in][out]   Size of the buffer in bytes pointed to by Buffer.

  @param  Buffer[out]           Pointer to the buffer for data to be written.
  
  @retval EFI_SUCCESS           Data was successfully stored by the protocol.

  @retval EFI_UNSUPPORTED       Platform policies do not allow for data to be written.

  @retval EFI_INVALID_PARAMETER BufferSize exceeds the maximum allowed limit.
                                BufferSize will be updated with the maximum size
                                required to complete the request.

  @retval EFI_INVALID_PARAMETER Buffersize is NULL. BufferSize and Buffer will not be
                                affected.

  @retval EFI_INVALID_PARAMETER Buffer is NULL. BufferSize and Buffer will not be affected.

  @retval EFI_DEVICE_ERROR      The data could not be stored due to a hardware error.

  @retval EFI_OUT_OF_RESOURCES  Not enough storage is available to hold the data.

  @retval EFI_PROTOCOL_ERROR    Input iSCSI initiator name does not adhere to RFC 3720.

**/
EFI_STATUS
EFIAPI
IScsiSetInitiatorName (
  IN     EFI_ISCSI_INITIATOR_NAME_PROTOCOL  *This,
  IN OUT UINTN                              *BufferSize,
  OUT    VOID                               *Buffer
  )
{
  EFI_STATUS  Status;

  if ((BufferSize == NULL) || (Buffer == NULL)) {
    return EFI_INVALID_PARAMETER;
  }

  if (*BufferSize > ISCSI_NAME_MAX_SIZE) {
    *BufferSize = ISCSI_NAME_MAX_SIZE;
    return EFI_INVALID_PARAMETER;
  }
  //
  // only support iqn iSCSI names.
  //
  Status = IScsiNormalizeName ((CHAR8 *) Buffer, *BufferSize - 1);
  if (EFI_ERROR (Status)) {
    return Status;
  }

  Status = gRT->SetVariable (
                  ISCSI_INITIATOR_NAME_VAR_NAME,
                  &gEfiIScsiInitiatorNameProtocolGuid,
                  EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS,
                  *BufferSize,
                  Buffer
                  );

  return Status;
}