system76-edk2/ShellPkg/Library/UefiShellDriver1CommandsLib/Unload.c

/** @file
  Main file for Unload shell Driver1 function.

  (C) Copyright 2015 Hewlett-Packard Development Company, L.P.<BR>
  Copyright (c) 2010 - 2018, Intel Corporation. All rights reserved.<BR>
  SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include "UefiShellDriver1CommandsLib.h"

/**
  Function to dump LoadedImage info from TheHandle.

  @param[in] TheHandle              The handle to dump info from.

  @retval EFI_SUCCESS               The info was dumped.
  @retval EFI_INVALID_PARAMETER     The handle did not have LoadedImage
**/
EFI_STATUS
DumpLoadedImageProtocolInfo (
  IN EFI_HANDLE   TheHandle
  )
{
  CHAR16 *TheString;

  TheString = GetProtocolInformationDump(TheHandle, &gEfiLoadedImageProtocolGuid, TRUE);

  ShellPrintEx(-1, -1, L"%s", TheString);

  SHELL_FREE_NON_NULL(TheString);

  return (EFI_SUCCESS);
}

STATIC CONST SHELL_PARAM_ITEM ParamList[] = {
  {L"-n", TypeFlag},
  {L"-v", TypeFlag},
  {L"-verbose", TypeFlag},
  {NULL, TypeMax}
  };

/**
  Function for 'unload' command.

  @param[in] ImageHandle  Handle to the Image (NULL if Internal).
  @param[in] SystemTable  Pointer to the System Table (NULL if Internal).
**/
SHELL_STATUS
EFIAPI
ShellCommandRunUnload (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  EFI_STATUS            Status;
  LIST_ENTRY            *Package;
  CHAR16                *ProblemParam;
  SHELL_STATUS          ShellStatus;
  EFI_HANDLE            TheHandle;
  CONST CHAR16          *Param1;
  SHELL_PROMPT_RESPONSE *Resp;
  UINT64                Value;

  ShellStatus         = SHELL_SUCCESS;
  Package             = NULL;
  Resp                = NULL;
  Value               = 0;
  TheHandle           = NULL;

  //
  // initialize the shell lib (we must be in non-auto-init...)
  //
  Status = ShellInitialize();
  ASSERT_EFI_ERROR(Status);

  //
  // parse the command line
  //
  Status = ShellCommandLineParse (ParamList, &Package, &ProblemParam, TRUE);
  if (EFI_ERROR(Status)) {
    if (Status == EFI_VOLUME_CORRUPTED && ProblemParam != NULL) {
      ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_PROBLEM), gShellDriver1HiiHandle,L"unload", ProblemParam);
      FreePool(ProblemParam);
      ShellStatus = SHELL_INVALID_PARAMETER;
    } else {
      ASSERT(FALSE);
    }
  } else {
    if (ShellCommandLineGetCount(Package) > 2){
      //
      // error for too many parameters
      //
      ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_TOO_MANY), gShellDriver1HiiHandle, L"unload");
      ShellStatus = SHELL_INVALID_PARAMETER;
    } else if (ShellCommandLineGetCount(Package) < 2) {
      ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_TOO_FEW), gShellDriver1HiiHandle, L"unload");
      ShellStatus = SHELL_INVALID_PARAMETER;
    } else {
      Param1    = ShellCommandLineGetRawValue(Package, 1);
      if (Param1 != NULL) {
        Status    = ShellConvertStringToUint64(Param1, &Value, TRUE, FALSE);
        TheHandle = ConvertHandleIndexToHandle((UINTN)Value);
      }

      if (EFI_ERROR(Status) || Param1 == NULL || TheHandle == NULL){
        ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_INV_HANDLE), gShellDriver1HiiHandle, L"unload", Param1);
        ShellStatus = SHELL_INVALID_PARAMETER;
      } else {
        ASSERT(TheHandle != NULL);
        if (ShellCommandLineGetFlag(Package, L"-v") || ShellCommandLineGetFlag(Package, L"-verbose")) {
          DumpLoadedImageProtocolInfo(TheHandle);
        }

        if (!ShellCommandLineGetFlag(Package, L"-n")) {
          Status = ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN(STR_UNLOAD_CONF), gShellDriver1HiiHandle, (UINTN)TheHandle);
          Status = ShellPromptForResponse(ShellPromptResponseTypeYesNo, NULL, (VOID**)&Resp);
        }
        if (ShellCommandLineGetFlag(Package, L"-n") || (Resp != NULL && *Resp == ShellPromptResponseYes)) {
          Status = gBS->UnloadImage(TheHandle);
          ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_HANDLE_RESULT), gShellDriver1HiiHandle, L"Unload", (UINTN)TheHandle, Status);
        }
        SHELL_FREE_NON_NULL(Resp);
      }
    }
  }
  if (ShellStatus == SHELL_SUCCESS) {
    if (Status == EFI_SECURITY_VIOLATION) {
      ShellStatus = SHELL_SECURITY_VIOLATION;
    } else if (Status == EFI_INVALID_PARAMETER) {
      ShellStatus = SHELL_INVALID_PARAMETER;
    } else if (EFI_ERROR(Status)) {
      ShellStatus = SHELL_NOT_FOUND;
    }
  }

  if (Package != NULL) {
    ShellCommandLineFreeVarList(Package);
  }

  return (ShellStatus);
}