[mirror_edk2.git] / NetworkPkg / HttpBootDxe / HttpBootSupport.c

/** @file\r
  Support functions implementation for UEFI HTTP boot driver.\r
\r
Copyright (c) 2015 - 2018, Intel Corporation. All rights reserved.<BR>\r
(C) Copyright 2016 - 2020 Hewlett Packard Enterprise Development LP<BR>\r
SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
#include "HttpBootDxe.h"\r
\r
\r
/**\r
  Get the Nic handle using any child handle in the IPv4 stack.\r
\r
  @param[in]  ControllerHandle    Pointer to child handle over IPv4.\r
\r
  @return NicHandle               The pointer to the Nic handle.\r
  @return NULL                    Can't find the Nic handle.\r
\r
**/\r
EFI_HANDLE\r
HttpBootGetNicByIp4Children (\r
  IN EFI_HANDLE                 ControllerHandle\r
  )\r
{\r
  EFI_HANDLE                    NicHandle;\r
\r
  NicHandle = NetLibGetNicHandle (ControllerHandle, &gEfiHttpProtocolGuid);\r
  if (NicHandle == NULL) {\r
    NicHandle = NetLibGetNicHandle (ControllerHandle, &gEfiDhcp4ProtocolGuid);\r
    if (NicHandle == NULL) {\r
      return NULL;\r
    }\r
  }\r
\r
  return NicHandle;\r
}\r
\r
/**\r
  Get the Nic handle using any child handle in the IPv6 stack.\r
\r
  @param[in]  ControllerHandle    Pointer to child handle over IPv6.\r
\r
  @return NicHandle               The pointer to the Nic handle.\r
  @return NULL                    Can't find the Nic handle.\r
\r
**/\r
EFI_HANDLE\r
HttpBootGetNicByIp6Children (\r
  IN EFI_HANDLE                 ControllerHandle\r
  )\r
{\r
  EFI_HANDLE                    NicHandle;\r
  NicHandle = NetLibGetNicHandle (ControllerHandle, &gEfiHttpProtocolGuid);\r
  if (NicHandle == NULL) {\r
    NicHandle = NetLibGetNicHandle (ControllerHandle, &gEfiDhcp6ProtocolGuid);\r
    if (NicHandle == NULL) {\r
      return NULL;\r
    }\r
  }\r
\r
  return NicHandle;\r
}\r
\r
/**\r
  This function is to convert UINTN to ASCII string with the required formatting.\r
\r
  @param[in]  Number         Numeric value to be converted.\r
  @param[in]  Buffer         The pointer to the buffer for ASCII string.\r
  @param[in]  Length         The length of the required format.\r
\r
**/\r
VOID\r
HttpBootUintnToAscDecWithFormat (\r
  IN UINTN                       Number,\r
  IN UINT8                       *Buffer,\r
  IN INTN                        Length\r
  )\r
{\r
  UINTN                          Remainder;\r
\r
  for (; Length > 0; Length--) {\r
    Remainder      = Number % 10;\r
    Number        /= 10;\r
    Buffer[Length - 1] = (UINT8) ('0' + Remainder);\r
  }\r
}\r
\r
/**\r
  This function is to display the IPv4 address.\r
\r
  @param[in]  Ip        The pointer to the IPv4 address.\r
\r
**/\r
VOID\r
HttpBootShowIp4Addr (\r
  IN EFI_IPv4_ADDRESS   *Ip\r
  )\r
{\r
  UINTN                 Index;\r
\r
  for (Index = 0; Index < 4; Index++) {\r
    AsciiPrint ("%d", Ip->Addr[Index]);\r
    if (Index < 3) {\r
      AsciiPrint (".");\r
    }\r
  }\r
}\r
\r
/**\r
  This function is to display the IPv6 address.\r
\r
  @param[in]  Ip        The pointer to the IPv6 address.\r
\r
**/\r
VOID\r
HttpBootShowIp6Addr (\r
  IN EFI_IPv6_ADDRESS   *Ip\r
  )\r
{\r
  UINTN                 Index;\r
\r
  for (Index = 0; Index < 16; Index++) {\r
\r
    if (Ip->Addr[Index] != 0) {\r
      AsciiPrint ("%x", Ip->Addr[Index]);\r
    }\r
    Index++;\r
    if (Index > 15) {\r
      return;\r
    }\r
    if (((Ip->Addr[Index] & 0xf0) == 0) && (Ip->Addr[Index - 1] != 0)) {\r
      AsciiPrint ("0");\r
    }\r
    AsciiPrint ("%x", Ip->Addr[Index]);\r
    if (Index < 15) {\r
      AsciiPrint (":");\r
    }\r
  }\r
}\r
\r
/**\r
  This function is to display the HTTP error status.\r
\r
  @param[in]      StatusCode      The status code value in HTTP message.\r
\r
**/\r
VOID\r
HttpBootPrintErrorMessage (\r
  EFI_HTTP_STATUS_CODE            StatusCode\r
  )\r
{\r
  AsciiPrint ("\n");\r
\r
  switch (StatusCode) {\r
  case HTTP_STATUS_300_MULTIPLE_CHOICES:\r
    AsciiPrint ("\n  Redirection: 300 Multiple Choices");\r
    break;\r
\r
  case HTTP_STATUS_301_MOVED_PERMANENTLY:\r
    AsciiPrint ("\n  Redirection: 301 Moved Permanently");\r
    break;\r
\r
  case HTTP_STATUS_302_FOUND:\r
    AsciiPrint ("\n  Redirection: 302 Found");\r
    break;\r
\r
  case HTTP_STATUS_303_SEE_OTHER:\r
    AsciiPrint ("\n  Redirection: 303 See Other");\r
    break;\r
\r
  case HTTP_STATUS_304_NOT_MODIFIED:\r
    AsciiPrint ("\n  Redirection: 304 Not Modified");\r
    break;\r
\r
  case HTTP_STATUS_305_USE_PROXY:\r
    AsciiPrint ("\n  Redirection: 305 Use Proxy");\r
    break;\r
\r
  case HTTP_STATUS_307_TEMPORARY_REDIRECT:\r
    AsciiPrint ("\n  Redirection: 307 Temporary Redirect");\r
    break;\r
\r
  case HTTP_STATUS_308_PERMANENT_REDIRECT:\r
    AsciiPrint ("\n  Redirection: 308 Permanent Redirect");\r
    break;\r
\r
  case HTTP_STATUS_400_BAD_REQUEST:\r
    AsciiPrint ("\n  Client Error: 400 Bad Request");\r
    break;\r
\r
  case HTTP_STATUS_401_UNAUTHORIZED:\r
    AsciiPrint ("\n  Client Error: 401 Unauthorized");\r
    break;\r
\r
  case HTTP_STATUS_402_PAYMENT_REQUIRED:\r
    AsciiPrint ("\n  Client Error: 402 Payment Required");\r
    break;\r
\r
  case HTTP_STATUS_403_FORBIDDEN:\r
    AsciiPrint ("\n  Client Error: 403 Forbidden");\r
    break;\r
\r
  case HTTP_STATUS_404_NOT_FOUND:\r
    AsciiPrint ("\n  Client Error: 404 Not Found");\r
    break;\r
\r
  case HTTP_STATUS_405_METHOD_NOT_ALLOWED:\r
    AsciiPrint ("\n  Client Error: 405 Method Not Allowed");\r
    break;\r
\r
  case HTTP_STATUS_406_NOT_ACCEPTABLE:\r
    AsciiPrint ("\n  Client Error: 406 Not Acceptable");\r
    break;\r
\r
  case HTTP_STATUS_407_PROXY_AUTHENTICATION_REQUIRED:\r
    AsciiPrint ("\n  Client Error: 407 Proxy Authentication Required");\r
    break;\r
\r
  case HTTP_STATUS_408_REQUEST_TIME_OUT:\r
    AsciiPrint ("\n  Client Error: 408 Request Timeout");\r
    break;\r
\r
  case HTTP_STATUS_409_CONFLICT:\r
    AsciiPrint ("\n  Client Error: 409 Conflict");\r
    break;\r
\r
  case HTTP_STATUS_410_GONE:\r
    AsciiPrint ("\n  Client Error: 410 Gone");\r
    break;\r
\r
  case HTTP_STATUS_411_LENGTH_REQUIRED:\r
    AsciiPrint ("\n  Client Error: 411 Length Required");\r
    break;\r
\r
  case HTTP_STATUS_412_PRECONDITION_FAILED:\r
    AsciiPrint ("\n  Client Error: 412 Precondition Failed");\r
    break;\r
\r
  case HTTP_STATUS_413_REQUEST_ENTITY_TOO_LARGE:\r
    AsciiPrint ("\n  Client Error: 413 Request Entity Too Large");\r
    break;\r
\r
  case HTTP_STATUS_414_REQUEST_URI_TOO_LARGE:\r
    AsciiPrint ("\n  Client Error: 414 Request URI Too Long");\r
    break;\r
\r
  case HTTP_STATUS_415_UNSUPPORTED_MEDIA_TYPE:\r
    AsciiPrint ("\n  Client Error: 415 Unsupported Media Type");\r
    break;\r
\r
  case HTTP_STATUS_416_REQUESTED_RANGE_NOT_SATISFIED:\r
    AsciiPrint ("\n  Client Error: 416 Requested Range Not Satisfiable");\r
    break;\r
\r
  case HTTP_STATUS_417_EXPECTATION_FAILED:\r
    AsciiPrint ("\n  Client Error: 417 Expectation Failed");\r
    break;\r
\r
  case HTTP_STATUS_500_INTERNAL_SERVER_ERROR:\r
    AsciiPrint ("\n  Server Error: 500 Internal Server Error");\r
    break;\r
\r
  case HTTP_STATUS_501_NOT_IMPLEMENTED:\r
    AsciiPrint ("\n  Server Error: 501 Not Implemented");\r
    break;\r
\r
  case HTTP_STATUS_502_BAD_GATEWAY:\r
    AsciiPrint ("\n  Server Error: 502 Bad Gateway");\r
    break;\r
\r
  case HTTP_STATUS_503_SERVICE_UNAVAILABLE:\r
    AsciiPrint ("\n  Server Error: 503 Service Unavailable");\r
    break;\r
\r
  case HTTP_STATUS_504_GATEWAY_TIME_OUT:\r
    AsciiPrint ("\n  Server Error: 504 Gateway Timeout");\r
    break;\r
\r
  case HTTP_STATUS_505_HTTP_VERSION_NOT_SUPPORTED:\r
    AsciiPrint ("\n  Server Error: 505 HTTP Version Not Supported");\r
    break;\r
\r
  default: ;\r
\r
  }\r
}\r
\r
/**\r
  Notify the callback function when an event is triggered.\r
\r
  @param[in]  Event           The triggered event.\r
  @param[in]  Context         The opaque parameter to the function.\r
\r
**/\r
VOID\r
EFIAPI\r
HttpBootCommonNotify (\r
  IN EFI_EVENT           Event,\r
  IN VOID                *Context\r
  )\r
{\r
  *((BOOLEAN *) Context) = TRUE;\r
}\r
\r
/**\r
  Retrieve the host address using the EFI_DNS6_PROTOCOL.\r
\r
  @param[in]  Private             The pointer to the driver's private data.\r
  @param[in]  HostName            Pointer to buffer containing hostname.\r
  @param[out] IpAddress           On output, pointer to buffer containing IPv6 address.\r
\r
  @retval EFI_SUCCESS             Operation succeeded.\r
  @retval EFI_DEVICE_ERROR        An unexpected network error occurred.\r
  @retval Others                  Other errors as indicated.\r
**/\r
EFI_STATUS\r
HttpBootDns (\r
  IN     HTTP_BOOT_PRIVATE_DATA   *Private,\r
  IN     CHAR16                   *HostName,\r
     OUT EFI_IPv6_ADDRESS         *IpAddress\r
  )\r
{\r
  EFI_STATUS                      Status;\r
  EFI_DNS6_PROTOCOL               *Dns6;\r
  EFI_DNS6_CONFIG_DATA            Dns6ConfigData;\r
  EFI_DNS6_COMPLETION_TOKEN       Token;\r
  EFI_HANDLE                      Dns6Handle;\r
  EFI_IP6_CONFIG_PROTOCOL         *Ip6Config;\r
  EFI_IPv6_ADDRESS                *DnsServerList;\r
  UINTN                           DnsServerListCount;\r
  UINTN                           DataSize;\r
  BOOLEAN                         IsDone;\r
\r
  DnsServerList       = NULL;\r
  DnsServerListCount  = 0;\r
  Dns6                = NULL;\r
  Dns6Handle          = NULL;\r
  ZeroMem (&Token, sizeof (EFI_DNS6_COMPLETION_TOKEN));\r
\r
  //\r
  // Get DNS server list from EFI IPv6 Configuration protocol.\r
  //\r
  Status = gBS->HandleProtocol (Private->Controller, &gEfiIp6ConfigProtocolGuid, (VOID **) &Ip6Config);\r
  if (!EFI_ERROR (Status)) {\r
    //\r
    // Get the required size.\r
    //\r
    DataSize = 0;\r
    Status = Ip6Config->GetData (Ip6Config, Ip6ConfigDataTypeDnsServer, &DataSize, NULL);\r
    if (Status == EFI_BUFFER_TOO_SMALL) {\r
      DnsServerList = AllocatePool (DataSize);\r
      if (DnsServerList == NULL) {\r
        return EFI_OUT_OF_RESOURCES;\r
      }\r
\r
      Status = Ip6Config->GetData (Ip6Config, Ip6ConfigDataTypeDnsServer, &DataSize, DnsServerList);\r
      if (EFI_ERROR (Status)) {\r
        FreePool (DnsServerList);\r
        DnsServerList = NULL;\r
      } else {\r
        DnsServerListCount = DataSize / sizeof (EFI_IPv6_ADDRESS);\r
      }\r
    }\r
  }\r
  //\r
  // Create a DNSv6 child instance and get the protocol.\r
  //\r
  Status = NetLibCreateServiceChild (\r
             Private->Controller,\r
             Private->Ip6Nic->ImageHandle,\r
             &gEfiDns6ServiceBindingProtocolGuid,\r
             &Dns6Handle\r
             );\r
  if (EFI_ERROR (Status)) {\r
    goto Exit;\r
  }\r
\r
  Status = gBS->OpenProtocol (\r
                  Dns6Handle,\r
                  &gEfiDns6ProtocolGuid,\r
                  (VOID **) &Dns6,\r
                  Private->Ip6Nic->ImageHandle,\r
                  Private->Controller,\r
                  EFI_OPEN_PROTOCOL_BY_DRIVER\r
                  );\r
  if (EFI_ERROR (Status)) {\r
    goto Exit;\r
  }\r
\r
  //\r
  // Configure DNS6 instance for the DNS server address and protocol.\r
  //\r
  ZeroMem (&Dns6ConfigData, sizeof (EFI_DNS6_CONFIG_DATA));\r
  Dns6ConfigData.DnsServerCount = (UINT32)DnsServerListCount;\r
  Dns6ConfigData.DnsServerList  = DnsServerList;\r
  Dns6ConfigData.EnableDnsCache = TRUE;\r
  Dns6ConfigData.Protocol       = EFI_IP_PROTO_UDP;\r
  IP6_COPY_ADDRESS (&Dns6ConfigData.StationIp,&Private->StationIp.v6);\r
  Status = Dns6->Configure (\r
                    Dns6,\r
                    &Dns6ConfigData\r
                    );\r
  if (EFI_ERROR (Status)) {\r
    goto Exit;\r
  }\r
\r
  Token.Status = EFI_NOT_READY;\r
  IsDone       = FALSE;\r
  //\r
  // Create event to set the  IsDone flag when name resolution is finished.\r
  //\r
  Status = gBS->CreateEvent (\r
                  EVT_NOTIFY_SIGNAL,\r
                  TPL_NOTIFY,\r
                  HttpBootCommonNotify,\r
                  &IsDone,\r
                  &Token.Event\r
                  );\r
  if (EFI_ERROR (Status)) {\r
    goto Exit;\r
  }\r
\r
  //\r
  // Start asynchronous name resolution.\r
  //\r
  Status = Dns6->HostNameToIp (Dns6, HostName, &Token);\r
  if (EFI_ERROR (Status)) {\r
    goto Exit;\r
  }\r
\r
  while (!IsDone) {\r
    Dns6->Poll (Dns6);\r
  }\r
\r
  //\r
  // Name resolution is done, check result.\r
  //\r
  Status = Token.Status;\r
  if (!EFI_ERROR (Status)) {\r
    if (Token.RspData.H2AData == NULL) {\r
      Status = EFI_DEVICE_ERROR;\r
      goto Exit;\r
    }\r
    if (Token.RspData.H2AData->IpCount == 0 || Token.RspData.H2AData->IpList == NULL) {\r
      Status = EFI_DEVICE_ERROR;\r
      goto Exit;\r
    }\r
    //\r
    // We just return the first IPv6 address from DNS protocol.\r
    //\r
    IP6_COPY_ADDRESS (IpAddress, Token.RspData.H2AData->IpList);\r
    Status = EFI_SUCCESS;\r
  }\r
Exit:\r
\r
  if (Token.Event != NULL) {\r
    gBS->CloseEvent (Token.Event);\r
  }\r
  if (Token.RspData.H2AData != NULL) {\r
    if (Token.RspData.H2AData->IpList != NULL) {\r
      FreePool (Token.RspData.H2AData->IpList);\r
    }\r
    FreePool (Token.RspData.H2AData);\r
  }\r
\r
  if (Dns6 != NULL) {\r
    Dns6->Configure (Dns6, NULL);\r
\r
    gBS->CloseProtocol (\r
           Dns6Handle,\r
           &gEfiDns6ProtocolGuid,\r
           Private->Ip6Nic->ImageHandle,\r
           Private->Controller\r
           );\r
  }\r
\r
  if (Dns6Handle != NULL) {\r
    NetLibDestroyServiceChild (\r
      Private->Controller,\r
      Private->Ip6Nic->ImageHandle,\r
      &gEfiDns6ServiceBindingProtocolGuid,\r
      Dns6Handle\r
      );\r
  }\r
\r
  if (DnsServerList != NULL) {\r
    FreePool (DnsServerList);\r
  }\r
\r
  return Status;\r
}\r
\r
/**\r
  This function checks the HTTP(S) URI scheme.\r
\r
  @param[in]    Uri              The pointer to the URI string.\r
\r
  @retval EFI_SUCCESS            The URI scheme is valid.\r
  @retval EFI_INVALID_PARAMETER  The URI scheme is not HTTP or HTTPS.\r
  @retval EFI_ACCESS_DENIED      HTTP is disabled and the URI is HTTP.\r
\r
**/\r
EFI_STATUS\r
HttpBootCheckUriScheme (\r
  IN      CHAR8                  *Uri\r
  )\r
{\r
  UINTN                Index;\r
  EFI_STATUS           Status;\r
\r
  Status = EFI_SUCCESS;\r
\r
  //\r
  // Convert the scheme to all lower case.\r
  //\r
  for (Index = 0; Index < AsciiStrLen (Uri); Index++) {\r
    if (Uri[Index] == ':') {\r
      break;\r
    }\r
    if (Uri[Index] >= 'A' && Uri[Index] <= 'Z') {\r
      Uri[Index] -= (CHAR8)('A' - 'a');\r
    }\r
  }\r
\r
  //\r
  // Return EFI_INVALID_PARAMETER if the URI is not HTTP or HTTPS.\r
  //\r
  if ((AsciiStrnCmp (Uri, "http://", 7) != 0) && (AsciiStrnCmp (Uri, "https://", 8) != 0)) {\r
    DEBUG ((EFI_D_ERROR, "HttpBootCheckUriScheme: Invalid Uri.\n"));\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  //\r
  // HTTP is disabled, return EFI_ACCESS_DENIED if the URI is HTTP.\r
  //\r
  if (!PcdGetBool (PcdAllowHttpConnections) && (AsciiStrnCmp (Uri, "http://", 7) == 0)) {\r
    DEBUG ((EFI_D_ERROR, "HttpBootCheckUriScheme: HTTP is disabled.\n"));\r
    return EFI_ACCESS_DENIED;\r
  }\r
\r
  return Status;\r
}\r
\r
/**\r
  Get the URI address string from the input device path.\r
\r
  Caller need to free the buffer in the UriAddress pointer.\r
\r
  @param[in]   FilePath         Pointer to the device path which contains a URI device path node.\r
  @param[out]  UriAddress       The URI address string extract from the device path.\r
\r
  @retval EFI_SUCCESS            The URI string is returned.\r
  @retval EFI_OUT_OF_RESOURCES   Failed to allocate memory.\r
\r
**/\r
EFI_STATUS\r
HttpBootParseFilePath (\r
  IN     EFI_DEVICE_PATH_PROTOCOL     *FilePath,\r
     OUT CHAR8                        **UriAddress\r
  )\r
{\r
  EFI_DEVICE_PATH_PROTOCOL  *TempDevicePath;\r
  URI_DEVICE_PATH           *UriDevicePath;\r
  CHAR8                     *Uri;\r
  UINTN                     UriStrLength;\r
\r
  if (FilePath == NULL) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  *UriAddress = NULL;\r
\r
  //\r
  // Extract the URI address from the FilePath\r
  //\r
  TempDevicePath = FilePath;\r
  while (!IsDevicePathEnd (TempDevicePath)) {\r
    if ((DevicePathType (TempDevicePath) == MESSAGING_DEVICE_PATH) &&\r
        (DevicePathSubType (TempDevicePath) == MSG_URI_DP)) {\r
      UriDevicePath = (URI_DEVICE_PATH*) TempDevicePath;\r
      //\r
      // UEFI Spec doesn't require the URI to be a NULL-terminated string\r
      // So we allocate a new buffer and always append a '\0' to it.\r
      //\r
      UriStrLength = DevicePathNodeLength (UriDevicePath) - sizeof(EFI_DEVICE_PATH_PROTOCOL);\r
      if (UriStrLength == 0) {\r
        //\r
        // return a NULL UriAddress if it's a empty URI device path node.\r
        //\r
        break;\r
      }\r
      Uri = AllocatePool (UriStrLength + 1);\r
      if (Uri == NULL) {\r
        return EFI_OUT_OF_RESOURCES;\r
      }\r
      CopyMem (Uri, UriDevicePath->Uri, DevicePathNodeLength (UriDevicePath) - sizeof(EFI_DEVICE_PATH_PROTOCOL));\r
      Uri[DevicePathNodeLength (UriDevicePath) - sizeof(EFI_DEVICE_PATH_PROTOCOL)] = '\0';\r
\r
      *UriAddress = Uri;\r
    }\r
    TempDevicePath = NextDevicePathNode (TempDevicePath);\r
  }\r
\r
  return EFI_SUCCESS;\r
}\r
\r
/**\r
  This function returns the image type according to server replied HTTP message\r
  and also the image's URI info.\r
\r
  @param[in]    Uri              The pointer to the image's URI string.\r
  @param[in]    UriParser        URI Parse result returned by NetHttpParseUrl().\r
  @param[in]    HeaderCount      Number of HTTP header structures in Headers list.\r
  @param[in]    Headers          Array containing list of HTTP headers.\r
  @param[out]   ImageType        The image type of the downloaded file.\r
\r
  @retval EFI_SUCCESS            The image type is returned in ImageType.\r
  @retval EFI_INVALID_PARAMETER  ImageType, Uri or UriParser is NULL.\r
  @retval EFI_INVALID_PARAMETER  HeaderCount is not zero, and Headers is NULL.\r
  @retval EFI_NOT_FOUND          Failed to identify the image type.\r
  @retval Others                 Unexpected error happened.\r
\r
**/\r
EFI_STATUS\r
HttpBootCheckImageType (\r
  IN      CHAR8                  *Uri,\r
  IN      VOID                   *UriParser,\r
  IN      UINTN                  HeaderCount,\r
  IN      EFI_HTTP_HEADER        *Headers,\r
     OUT  HTTP_BOOT_IMAGE_TYPE   *ImageType\r
  )\r
{\r
  EFI_STATUS            Status;\r
  EFI_HTTP_HEADER       *Header;\r
  CHAR8                 *FilePath;\r
  CHAR8                 *FilePost;\r
\r
  if (Uri == NULL || UriParser == NULL || ImageType == NULL) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  if (HeaderCount != 0 && Headers == NULL) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  //\r
  // Determine the image type by the HTTP Content-Type header field first.\r
  //   "application/efi"         -> EFI Image\r
  //   "application/vnd.efi-iso" -> CD/DVD Image\r
  //   "application/vnd.efi-img" -> Virtual Disk Image\r
  //\r
  Header = HttpFindHeader (HeaderCount, Headers, HTTP_HEADER_CONTENT_TYPE);\r
  if (Header != NULL) {\r
    if (AsciiStriCmp (Header->FieldValue, HTTP_CONTENT_TYPE_APP_EFI) == 0) {\r
      *ImageType = ImageTypeEfi;\r
      return EFI_SUCCESS;\r
    } else if (AsciiStriCmp (Header->FieldValue, HTTP_CONTENT_TYPE_APP_ISO) == 0) {\r
      *ImageType = ImageTypeVirtualCd;\r
      return EFI_SUCCESS;\r
    } else if (AsciiStriCmp (Header->FieldValue, HTTP_CONTENT_TYPE_APP_IMG) == 0) {\r
      *ImageType = ImageTypeVirtualDisk;\r
      return EFI_SUCCESS;\r
    }\r
  }\r
\r
  //\r
  // Determine the image type by file extension:\r
  //   *.efi -> EFI Image\r
  //   *.iso -> CD/DVD Image\r
  //   *.img -> Virtual Disk Image\r
  //\r
  Status = HttpUrlGetPath (\r
             Uri,\r
             UriParser,\r
             &FilePath\r
             );\r
  if (EFI_ERROR (Status)) {\r
    return Status;\r
  }\r
\r
  FilePost = FilePath + AsciiStrLen (FilePath) - 4;\r
  if (AsciiStrCmp (FilePost, ".efi") == 0) {\r
    *ImageType = ImageTypeEfi;\r
  } else if (AsciiStrCmp (FilePost, ".iso") == 0) {\r
    *ImageType = ImageTypeVirtualCd;\r
  } else if (AsciiStrCmp (FilePost, ".img") == 0) {\r
    *ImageType = ImageTypeVirtualDisk;\r
  } else {\r
    *ImageType = ImageTypeMax;\r
  }\r
\r
  FreePool (FilePath);\r
\r
  return (*ImageType < ImageTypeMax) ? EFI_SUCCESS : EFI_NOT_FOUND;\r
}\r
\r
/**\r
  This function register the RAM disk info to the system.\r
\r
  @param[in]       Private         The pointer to the driver's private data.\r
  @param[in]       BufferSize      The size of Buffer in bytes.\r
  @param[in]       Buffer          The base address of the RAM disk.\r
  @param[in]       ImageType       The image type of the file in Buffer.\r
\r
  @retval EFI_SUCCESS              The RAM disk has been registered.\r
  @retval EFI_NOT_FOUND            No RAM disk protocol instances were found.\r
  @retval EFI_UNSUPPORTED          The ImageType is not supported.\r
  @retval Others                   Unexpected error happened.\r
\r
**/\r
EFI_STATUS\r
HttpBootRegisterRamDisk (\r
  IN  HTTP_BOOT_PRIVATE_DATA       *Private,\r
  IN  UINTN                        BufferSize,\r
  IN  VOID                         *Buffer,\r
  IN  HTTP_BOOT_IMAGE_TYPE         ImageType\r
  )\r
{\r
  EFI_RAM_DISK_PROTOCOL      *RamDisk;\r
  EFI_STATUS                 Status;\r
  EFI_DEVICE_PATH_PROTOCOL   *DevicePath;\r
  EFI_GUID                   *RamDiskType;\r
\r
  ASSERT (Private != NULL);\r
  ASSERT (Buffer != NULL);\r
  ASSERT (BufferSize != 0);\r
\r
  Status = gBS->LocateProtocol (&gEfiRamDiskProtocolGuid, NULL, (VOID**) &RamDisk);\r
  if (EFI_ERROR (Status)) {\r
    DEBUG ((EFI_D_ERROR, "HTTP Boot: Couldn't find the RAM Disk protocol - %r\n", Status));\r
    return Status;\r
  }\r
\r
  if (ImageType == ImageTypeVirtualCd) {\r
    RamDiskType = &gEfiVirtualCdGuid;\r
  } else if (ImageType == ImageTypeVirtualDisk) {\r
    RamDiskType = &gEfiVirtualDiskGuid;\r
  } else {\r
    return EFI_UNSUPPORTED;\r
  }\r
\r
  Status = RamDisk->Register (\r
             (UINTN)Buffer,\r
             (UINT64)BufferSize,\r
             RamDiskType,\r
             Private->UsingIpv6 ? Private->Ip6Nic->DevicePath : Private->Ip4Nic->DevicePath,\r
             &DevicePath\r
             );\r
  if (EFI_ERROR (Status)) {\r
    DEBUG ((EFI_D_ERROR, "HTTP Boot: Failed to register RAM Disk - %r\n", Status));\r
  }\r
\r
  return Status;\r
}\r
\r
/**\r
  Indicate if the HTTP status code indicates a redirection.\r
\r
  @param[in]  StatusCode      HTTP status code from server.\r
\r
  @return                     TRUE if it's redirection.\r
\r
**/\r
BOOLEAN\r
HttpBootIsHttpRedirectStatusCode (\r
  IN   EFI_HTTP_STATUS_CODE        StatusCode\r
  )\r
{\r
  if (StatusCode == HTTP_STATUS_301_MOVED_PERMANENTLY ||\r
      StatusCode == HTTP_STATUS_302_FOUND ||\r
      StatusCode == HTTP_STATUS_307_TEMPORARY_REDIRECT ||\r
      StatusCode == HTTP_STATUS_308_PERMANENT_REDIRECT) {\r
    return TRUE;\r
  }\r
\r
  return FALSE;\r
}\r