NetworkPkg/HttpBootDxe/HttpBootSupport.c

   1 /** @file
   2   Support functions implementation for UEFI HTTP boot driver.
   3
   4 Copyright (c) 2015 - 2018, Intel Corporation. All rights reserved.<BR>
   5 (C) Copyright 2016 - 2020 Hewlett Packard Enterprise Development LP<BR>
   6 SPDX-License-Identifier: BSD-2-Clause-Patent
   7
   8 **/
   9
  10 #include "HttpBootDxe.h"
  11
  12
  13 /**
  14   Get the Nic handle using any child handle in the IPv4 stack.
  15
  16   @param[in]  ControllerHandle    Pointer to child handle over IPv4.
  17
  18   @return NicHandle               The pointer to the Nic handle.
  19   @return NULL                    Can't find the Nic handle.
  20
  21 **/
  22 EFI_HANDLE
  23 HttpBootGetNicByIp4Children (
  24   IN EFI_HANDLE                 ControllerHandle
  25   )
  26 {
  27   EFI_HANDLE                    NicHandle;
  28
  29   NicHandle = NetLibGetNicHandle (ControllerHandle, &gEfiHttpProtocolGuid);
  30   if (NicHandle == NULL) {
  31     NicHandle = NetLibGetNicHandle (ControllerHandle, &gEfiDhcp4ProtocolGuid);
  32     if (NicHandle == NULL) {
  33       return NULL;
  34     }
  35   }
  36
  37   return NicHandle;
  38 }
  39
  40 /**
  41   Get the Nic handle using any child handle in the IPv6 stack.
  42
  43   @param[in]  ControllerHandle    Pointer to child handle over IPv6.
  44
  45   @return NicHandle               The pointer to the Nic handle.
  46   @return NULL                    Can't find the Nic handle.
  47
  48 **/
  49 EFI_HANDLE
  50 HttpBootGetNicByIp6Children (
  51   IN EFI_HANDLE                 ControllerHandle
  52   )
  53 {
  54   EFI_HANDLE                    NicHandle;
  55   NicHandle = NetLibGetNicHandle (ControllerHandle, &gEfiHttpProtocolGuid);
  56   if (NicHandle == NULL) {
  57     NicHandle = NetLibGetNicHandle (ControllerHandle, &gEfiDhcp6ProtocolGuid);
  58     if (NicHandle == NULL) {
  59       return NULL;
  60     }
  61   }
  62
  63   return NicHandle;
  64 }
  65
  66 /**
  67   This function is to convert UINTN to ASCII string with the required formatting.
  68
  69   @param[in]  Number         Numeric value to be converted.
  70   @param[in]  Buffer         The pointer to the buffer for ASCII string.
  71   @param[in]  Length         The length of the required format.
  72
  73 **/
  74 VOID
  75 HttpBootUintnToAscDecWithFormat (
  76   IN UINTN                       Number,
  77   IN UINT8                       *Buffer,
  78   IN INTN                        Length
  79   )
  80 {
  81   UINTN                          Remainder;
  82
  83   for (; Length > 0; Length--) {
  84     Remainder      = Number % 10;
  85     Number        /= 10;
  86     Buffer[Length - 1] = (UINT8) ('0' + Remainder);
  87   }
  88 }
  89
  90 /**
  91   This function is to display the IPv4 address.
  92
  93   @param[in]  Ip        The pointer to the IPv4 address.
  94
  95 **/
  96 VOID
  97 HttpBootShowIp4Addr (
  98   IN EFI_IPv4_ADDRESS   *Ip
  99   )
 100 {
 101   UINTN                 Index;
 102
 103   for (Index = 0; Index < 4; Index++) {
 104     AsciiPrint ("%d", Ip->Addr[Index]);
 105     if (Index < 3) {
 106       AsciiPrint (".");
 107     }
 108   }
 109 }
 110
 111 /**
 112   This function is to display the IPv6 address.
 113
 114   @param[in]  Ip        The pointer to the IPv6 address.
 115
 116 **/
 117 VOID
 118 HttpBootShowIp6Addr (
 119   IN EFI_IPv6_ADDRESS   *Ip
 120   )
 121 {
 122   UINTN                 Index;
 123
 124   for (Index = 0; Index < 16; Index++) {
 125
 126     if (Ip->Addr[Index] != 0) {
 127       AsciiPrint ("%x", Ip->Addr[Index]);
 128     }
 129     Index++;
 130     if (Index > 15) {
 131       return;
 132     }
 133     if (((Ip->Addr[Index] & 0xf0) == 0) && (Ip->Addr[Index - 1] != 0)) {
 134       AsciiPrint ("0");
 135     }
 136     AsciiPrint ("%x", Ip->Addr[Index]);
 137     if (Index < 15) {
 138       AsciiPrint (":");
 139     }
 140   }
 141 }
 142
 143 /**
 144   This function is to display the HTTP error status.
 145
 146   @param[in]      StatusCode      The status code value in HTTP message.
 147
 148 **/
 149 VOID
 150 HttpBootPrintErrorMessage (
 151   EFI_HTTP_STATUS_CODE            StatusCode
 152   )
 153 {
 154   AsciiPrint ("\n");
 155
 156   switch (StatusCode) {
 157   case HTTP_STATUS_300_MULTIPLE_CHOICES:
 158     AsciiPrint ("\n  Redirection: 300 Multiple Choices");
 159     break;
 160
 161   case HTTP_STATUS_301_MOVED_PERMANENTLY:
 162     AsciiPrint ("\n  Redirection: 301 Moved Permanently");
 163     break;
 164
 165   case HTTP_STATUS_302_FOUND:
 166     AsciiPrint ("\n  Redirection: 302 Found");
 167     break;
 168
 169   case HTTP_STATUS_303_SEE_OTHER:
 170     AsciiPrint ("\n  Redirection: 303 See Other");
 171     break;
 172
 173   case HTTP_STATUS_304_NOT_MODIFIED:
 174     AsciiPrint ("\n  Redirection: 304 Not Modified");
 175     break;
 176
 177   case HTTP_STATUS_305_USE_PROXY:
 178     AsciiPrint ("\n  Redirection: 305 Use Proxy");
 179     break;
 180
 181   case HTTP_STATUS_307_TEMPORARY_REDIRECT:
 182     AsciiPrint ("\n  Redirection: 307 Temporary Redirect");
 183     break;
 184
 185   case HTTP_STATUS_308_PERMANENT_REDIRECT:
 186     AsciiPrint ("\n  Redirection: 308 Permanent Redirect");
 187     break;
 188
 189   case HTTP_STATUS_400_BAD_REQUEST:
 190     AsciiPrint ("\n  Client Error: 400 Bad Request");
 191     break;
 192
 193   case HTTP_STATUS_401_UNAUTHORIZED:
 194     AsciiPrint ("\n  Client Error: 401 Unauthorized");
 195     break;
 196
 197   case HTTP_STATUS_402_PAYMENT_REQUIRED:
 198     AsciiPrint ("\n  Client Error: 402 Payment Required");
 199     break;
 200
 201   case HTTP_STATUS_403_FORBIDDEN:
 202     AsciiPrint ("\n  Client Error: 403 Forbidden");
 203     break;
 204
 205   case HTTP_STATUS_404_NOT_FOUND:
 206     AsciiPrint ("\n  Client Error: 404 Not Found");
 207     break;
 208
 209   case HTTP_STATUS_405_METHOD_NOT_ALLOWED:
 210     AsciiPrint ("\n  Client Error: 405 Method Not Allowed");
 211     break;
 212
 213   case HTTP_STATUS_406_NOT_ACCEPTABLE:
 214     AsciiPrint ("\n  Client Error: 406 Not Acceptable");
 215     break;
 216
 217   case HTTP_STATUS_407_PROXY_AUTHENTICATION_REQUIRED:
 218     AsciiPrint ("\n  Client Error: 407 Proxy Authentication Required");
 219     break;
 220
 221   case HTTP_STATUS_408_REQUEST_TIME_OUT:
 222     AsciiPrint ("\n  Client Error: 408 Request Timeout");
 223     break;
 224
 225   case HTTP_STATUS_409_CONFLICT:
 226     AsciiPrint ("\n  Client Error: 409 Conflict");
 227     break;
 228
 229   case HTTP_STATUS_410_GONE:
 230     AsciiPrint ("\n  Client Error: 410 Gone");
 231     break;
 232
 233   case HTTP_STATUS_411_LENGTH_REQUIRED:
 234     AsciiPrint ("\n  Client Error: 411 Length Required");
 235     break;
 236
 237   case HTTP_STATUS_412_PRECONDITION_FAILED:
 238     AsciiPrint ("\n  Client Error: 412 Precondition Failed");
 239     break;
 240
 241   case HTTP_STATUS_413_REQUEST_ENTITY_TOO_LARGE:
 242     AsciiPrint ("\n  Client Error: 413 Request Entity Too Large");
 243     break;
 244
 245   case HTTP_STATUS_414_REQUEST_URI_TOO_LARGE:
 246     AsciiPrint ("\n  Client Error: 414 Request URI Too Long");
 247     break;
 248
 249   case HTTP_STATUS_415_UNSUPPORTED_MEDIA_TYPE:
 250     AsciiPrint ("\n  Client Error: 415 Unsupported Media Type");
 251     break;
 252
 253   case HTTP_STATUS_416_REQUESTED_RANGE_NOT_SATISFIED:
 254     AsciiPrint ("\n  Client Error: 416 Requested Range Not Satisfiable");
 255     break;
 256
 257   case HTTP_STATUS_417_EXPECTATION_FAILED:
 258     AsciiPrint ("\n  Client Error: 417 Expectation Failed");
 259     break;
 260
 261   case HTTP_STATUS_500_INTERNAL_SERVER_ERROR:
 262     AsciiPrint ("\n  Server Error: 500 Internal Server Error");
 263     break;
 264
 265   case HTTP_STATUS_501_NOT_IMPLEMENTED:
 266     AsciiPrint ("\n  Server Error: 501 Not Implemented");
 267     break;
 268
 269   case HTTP_STATUS_502_BAD_GATEWAY:
 270     AsciiPrint ("\n  Server Error: 502 Bad Gateway");
 271     break;
 272
 273   case HTTP_STATUS_503_SERVICE_UNAVAILABLE:
 274     AsciiPrint ("\n  Server Error: 503 Service Unavailable");
 275     break;
 276
 277   case HTTP_STATUS_504_GATEWAY_TIME_OUT:
 278     AsciiPrint ("\n  Server Error: 504 Gateway Timeout");
 279     break;
 280
 281   case HTTP_STATUS_505_HTTP_VERSION_NOT_SUPPORTED:
 282     AsciiPrint ("\n  Server Error: 505 HTTP Version Not Supported");
 283     break;
 284
 285   default: ;
 286
 287   }
 288 }
 289
 290 /**
 291   Notify the callback function when an event is triggered.
 292
 293   @param[in]  Event           The triggered event.
 294   @param[in]  Context         The opaque parameter to the function.
 295
 296 **/
 297 VOID
 298 EFIAPI
 299 HttpBootCommonNotify (
 300   IN EFI_EVENT           Event,
 301   IN VOID                *Context
 302   )
 303 {
 304   *((BOOLEAN *) Context) = TRUE;
 305 }
 306
 307 /**
 308   Retrieve the host address using the EFI_DNS6_PROTOCOL.
 309
 310   @param[in]  Private             The pointer to the driver's private data.
 311   @param[in]  HostName            Pointer to buffer containing hostname.
 312   @param[out] IpAddress           On output, pointer to buffer containing IPv6 address.
 313
 314   @retval EFI_SUCCESS             Operation succeeded.
 315   @retval EFI_DEVICE_ERROR        An unexpected network error occurred.
 316   @retval Others                  Other errors as indicated.
 317 **/
 318 EFI_STATUS
 319 HttpBootDns (
 320   IN     HTTP_BOOT_PRIVATE_DATA   *Private,
 321   IN     CHAR16                   *HostName,
 322      OUT EFI_IPv6_ADDRESS         *IpAddress
 323   )
 324 {
 325   EFI_STATUS                      Status;
 326   EFI_DNS6_PROTOCOL               *Dns6;
 327   EFI_DNS6_CONFIG_DATA            Dns6ConfigData;
 328   EFI_DNS6_COMPLETION_TOKEN       Token;
 329   EFI_HANDLE                      Dns6Handle;
 330   EFI_IP6_CONFIG_PROTOCOL         *Ip6Config;
 331   EFI_IPv6_ADDRESS                *DnsServerList;
 332   UINTN                           DnsServerListCount;
 333   UINTN                           DataSize;
 334   BOOLEAN                         IsDone;
 335
 336   DnsServerList       = NULL;
 337   DnsServerListCount  = 0;
 338   Dns6                = NULL;
 339   Dns6Handle          = NULL;
 340   ZeroMem (&Token, sizeof (EFI_DNS6_COMPLETION_TOKEN));
 341
 342   //
 343   // Get DNS server list from EFI IPv6 Configuration protocol.
 344   //
 345   Status = gBS->HandleProtocol (Private->Controller, &gEfiIp6ConfigProtocolGuid, (VOID **) &Ip6Config);
 346   if (!EFI_ERROR (Status)) {
 347     //
 348     // Get the required size.
 349     //
 350     DataSize = 0;
 351     Status = Ip6Config->GetData (Ip6Config, Ip6ConfigDataTypeDnsServer, &DataSize, NULL);
 352     if (Status == EFI_BUFFER_TOO_SMALL) {
 353       DnsServerList = AllocatePool (DataSize);
 354       if (DnsServerList == NULL) {
 355         return EFI_OUT_OF_RESOURCES;
 356       }
 357
 358       Status = Ip6Config->GetData (Ip6Config, Ip6ConfigDataTypeDnsServer, &DataSize, DnsServerList);
 359       if (EFI_ERROR (Status)) {
 360         FreePool (DnsServerList);
 361         DnsServerList = NULL;
 362       } else {
 363         DnsServerListCount = DataSize / sizeof (EFI_IPv6_ADDRESS);
 364       }
 365     }
 366   }
 367   //
 368   // Create a DNSv6 child instance and get the protocol.
 369   //
 370   Status = NetLibCreateServiceChild (
 371              Private->Controller,
 372              Private->Ip6Nic->ImageHandle,
 373              &gEfiDns6ServiceBindingProtocolGuid,
 374              &Dns6Handle
 375              );
 376   if (EFI_ERROR (Status)) {
 377     goto Exit;
 378   }
 379
 380   Status = gBS->OpenProtocol (
 381                   Dns6Handle,
 382                   &gEfiDns6ProtocolGuid,
 383                   (VOID **) &Dns6,
 384                   Private->Ip6Nic->ImageHandle,
 385                   Private->Controller,
 386                   EFI_OPEN_PROTOCOL_BY_DRIVER
 387                   );
 388   if (EFI_ERROR (Status)) {
 389     goto Exit;
 390   }
 391
 392   //
 393   // Configure DNS6 instance for the DNS server address and protocol.
 394   //
 395   ZeroMem (&Dns6ConfigData, sizeof (EFI_DNS6_CONFIG_DATA));
 396   Dns6ConfigData.DnsServerCount = (UINT32)DnsServerListCount;
 397   Dns6ConfigData.DnsServerList  = DnsServerList;
 398   Dns6ConfigData.EnableDnsCache = TRUE;
 399   Dns6ConfigData.Protocol       = EFI_IP_PROTO_UDP;
 400   IP6_COPY_ADDRESS (&Dns6ConfigData.StationIp,&Private->StationIp.v6);
 401   Status = Dns6->Configure (
 402                     Dns6,
 403                     &Dns6ConfigData
 404                     );
 405   if (EFI_ERROR (Status)) {
 406     goto Exit;
 407   }
 408
 409   Token.Status = EFI_NOT_READY;
 410   IsDone       = FALSE;
 411   //
 412   // Create event to set the  IsDone flag when name resolution is finished.
 413   //
 414   Status = gBS->CreateEvent (
 415                   EVT_NOTIFY_SIGNAL,
 416                   TPL_NOTIFY,
 417                   HttpBootCommonNotify,
 418                   &IsDone,
 419                   &Token.Event
 420                   );
 421   if (EFI_ERROR (Status)) {
 422     goto Exit;
 423   }
 424
 425   //
 426   // Start asynchronous name resolution.
 427   //
 428   Status = Dns6->HostNameToIp (Dns6, HostName, &Token);
 429   if (EFI_ERROR (Status)) {
 430     goto Exit;
 431   }
 432
 433   while (!IsDone) {
 434     Dns6->Poll (Dns6);
 435   }
 436
 437   //
 438   // Name resolution is done, check result.
 439   //
 440   Status = Token.Status;
 441   if (!EFI_ERROR (Status)) {
 442     if (Token.RspData.H2AData == NULL) {
 443       Status = EFI_DEVICE_ERROR;
 444       goto Exit;
 445     }
 446     if (Token.RspData.H2AData->IpCount == 0 || Token.RspData.H2AData->IpList == NULL) {
 447       Status = EFI_DEVICE_ERROR;
 448       goto Exit;
 449     }
 450     //
 451     // We just return the first IPv6 address from DNS protocol.
 452     //
 453     IP6_COPY_ADDRESS (IpAddress, Token.RspData.H2AData->IpList);
 454     Status = EFI_SUCCESS;
 455   }
 456 Exit:
 457
 458   if (Token.Event != NULL) {
 459     gBS->CloseEvent (Token.Event);
 460   }
 461   if (Token.RspData.H2AData != NULL) {
 462     if (Token.RspData.H2AData->IpList != NULL) {
 463       FreePool (Token.RspData.H2AData->IpList);
 464     }
 465     FreePool (Token.RspData.H2AData);
 466   }
 467
 468   if (Dns6 != NULL) {
 469     Dns6->Configure (Dns6, NULL);
 470
 471     gBS->CloseProtocol (
 472            Dns6Handle,
 473            &gEfiDns6ProtocolGuid,
 474            Private->Ip6Nic->ImageHandle,
 475            Private->Controller
 476            );
 477   }
 478
 479   if (Dns6Handle != NULL) {
 480     NetLibDestroyServiceChild (
 481       Private->Controller,
 482       Private->Ip6Nic->ImageHandle,
 483       &gEfiDns6ServiceBindingProtocolGuid,
 484       Dns6Handle
 485       );
 486   }
 487
 488   if (DnsServerList != NULL) {
 489     FreePool (DnsServerList);
 490   }
 491
 492   return Status;
 493 }
 494
 495 /**
 496   This function checks the HTTP(S) URI scheme.
 497
 498   @param[in]    Uri              The pointer to the URI string.
 499
 500   @retval EFI_SUCCESS            The URI scheme is valid.
 501   @retval EFI_INVALID_PARAMETER  The URI scheme is not HTTP or HTTPS.
 502   @retval EFI_ACCESS_DENIED      HTTP is disabled and the URI is HTTP.
 503
 504 **/
 505 EFI_STATUS
 506 HttpBootCheckUriScheme (
 507   IN      CHAR8                  *Uri
 508   )
 509 {
 510   UINTN                Index;
 511   EFI_STATUS           Status;
 512
 513   Status = EFI_SUCCESS;
 514
 515   //
 516   // Convert the scheme to all lower case.
 517   //
 518   for (Index = 0; Index < AsciiStrLen (Uri); Index++) {
 519     if (Uri[Index] == ':') {
 520       break;
 521     }
 522     if (Uri[Index] >= 'A' && Uri[Index] <= 'Z') {
 523       Uri[Index] -= (CHAR8)('A' - 'a');
 524     }
 525   }
 526
 527   //
 528   // Return EFI_INVALID_PARAMETER if the URI is not HTTP or HTTPS.
 529   //
 530   if ((AsciiStrnCmp (Uri, "http://", 7) != 0) && (AsciiStrnCmp (Uri, "https://", 8) != 0)) {
 531     DEBUG ((EFI_D_ERROR, "HttpBootCheckUriScheme: Invalid Uri.\n"));
 532     return EFI_INVALID_PARAMETER;
 533   }
 534
 535   //
 536   // HTTP is disabled, return EFI_ACCESS_DENIED if the URI is HTTP.
 537   //
 538   if (!PcdGetBool (PcdAllowHttpConnections) && (AsciiStrnCmp (Uri, "http://", 7) == 0)) {
 539     DEBUG ((EFI_D_ERROR, "HttpBootCheckUriScheme: HTTP is disabled.\n"));
 540     return EFI_ACCESS_DENIED;
 541   }
 542
 543   return Status;
 544 }
 545
 546 /**
 547   Get the URI address string from the input device path.
 548
 549   Caller need to free the buffer in the UriAddress pointer.
 550
 551   @param[in]   FilePath         Pointer to the device path which contains a URI device path node.
 552   @param[out]  UriAddress       The URI address string extract from the device path.
 553
 554   @retval EFI_SUCCESS            The URI string is returned.
 555   @retval EFI_OUT_OF_RESOURCES   Failed to allocate memory.
 556
 557 **/
 558 EFI_STATUS
 559 HttpBootParseFilePath (
 560   IN     EFI_DEVICE_PATH_PROTOCOL     *FilePath,
 561      OUT CHAR8                        **UriAddress
 562   )
 563 {
 564   EFI_DEVICE_PATH_PROTOCOL  *TempDevicePath;
 565   URI_DEVICE_PATH           *UriDevicePath;
 566   CHAR8                     *Uri;
 567   UINTN                     UriStrLength;
 568
 569   if (FilePath == NULL) {
 570     return EFI_INVALID_PARAMETER;
 571   }
 572
 573   *UriAddress = NULL;
 574
 575   //
 576   // Extract the URI address from the FilePath
 577   //
 578   TempDevicePath = FilePath;
 579   while (!IsDevicePathEnd (TempDevicePath)) {
 580     if ((DevicePathType (TempDevicePath) == MESSAGING_DEVICE_PATH) &&
 581         (DevicePathSubType (TempDevicePath) == MSG_URI_DP)) {
 582       UriDevicePath = (URI_DEVICE_PATH*) TempDevicePath;
 583       //
 584       // UEFI Spec doesn't require the URI to be a NULL-terminated string
 585       // So we allocate a new buffer and always append a '\0' to it.
 586       //
 587       UriStrLength = DevicePathNodeLength (UriDevicePath) - sizeof(EFI_DEVICE_PATH_PROTOCOL);
 588       if (UriStrLength == 0) {
 589         //
 590         // return a NULL UriAddress if it's a empty URI device path node.
 591         //
 592         break;
 593       }
 594       Uri = AllocatePool (UriStrLength + 1);
 595       if (Uri == NULL) {
 596         return EFI_OUT_OF_RESOURCES;
 597       }
 598       CopyMem (Uri, UriDevicePath->Uri, DevicePathNodeLength (UriDevicePath) - sizeof(EFI_DEVICE_PATH_PROTOCOL));
 599       Uri[DevicePathNodeLength (UriDevicePath) - sizeof(EFI_DEVICE_PATH_PROTOCOL)] = '\0';
 600
 601       *UriAddress = Uri;
 602     }
 603     TempDevicePath = NextDevicePathNode (TempDevicePath);
 604   }
 605
 606   return EFI_SUCCESS;
 607 }
 608
 609 /**
 610   This function returns the image type according to server replied HTTP message
 611   and also the image's URI info.
 612
 613   @param[in]    Uri              The pointer to the image's URI string.
 614   @param[in]    UriParser        URI Parse result returned by NetHttpParseUrl().
 615   @param[in]    HeaderCount      Number of HTTP header structures in Headers list.
 616   @param[in]    Headers          Array containing list of HTTP headers.
 617   @param[out]   ImageType        The image type of the downloaded file.
 618
 619   @retval EFI_SUCCESS            The image type is returned in ImageType.
 620   @retval EFI_INVALID_PARAMETER  ImageType, Uri or UriParser is NULL.
 621   @retval EFI_INVALID_PARAMETER  HeaderCount is not zero, and Headers is NULL.
 622   @retval EFI_NOT_FOUND          Failed to identify the image type.
 623   @retval Others                 Unexpected error happened.
 624
 625 **/
 626 EFI_STATUS
 627 HttpBootCheckImageType (
 628   IN      CHAR8                  *Uri,
 629   IN      VOID                   *UriParser,
 630   IN      UINTN                  HeaderCount,
 631   IN      EFI_HTTP_HEADER        *Headers,
 632      OUT  HTTP_BOOT_IMAGE_TYPE   *ImageType
 633   )
 634 {
 635   EFI_STATUS            Status;
 636   EFI_HTTP_HEADER       *Header;
 637   CHAR8                 *FilePath;
 638   CHAR8                 *FilePost;
 639
 640   if (Uri == NULL || UriParser == NULL || ImageType == NULL) {
 641     return EFI_INVALID_PARAMETER;
 642   }
 643
 644   if (HeaderCount != 0 && Headers == NULL) {
 645     return EFI_INVALID_PARAMETER;
 646   }
 647
 648   //
 649   // Determine the image type by the HTTP Content-Type header field first.
 650   //   "application/efi"         -> EFI Image
 651   //   "application/vnd.efi-iso" -> CD/DVD Image
 652   //   "application/vnd.efi-img" -> Virtual Disk Image
 653   //
 654   Header = HttpFindHeader (HeaderCount, Headers, HTTP_HEADER_CONTENT_TYPE);
 655   if (Header != NULL) {
 656     if (AsciiStriCmp (Header->FieldValue, HTTP_CONTENT_TYPE_APP_EFI) == 0) {
 657       *ImageType = ImageTypeEfi;
 658       return EFI_SUCCESS;
 659     } else if (AsciiStriCmp (Header->FieldValue, HTTP_CONTENT_TYPE_APP_ISO) == 0) {
 660       *ImageType = ImageTypeVirtualCd;
 661       return EFI_SUCCESS;
 662     } else if (AsciiStriCmp (Header->FieldValue, HTTP_CONTENT_TYPE_APP_IMG) == 0) {
 663       *ImageType = ImageTypeVirtualDisk;
 664       return EFI_SUCCESS;
 665     }
 666   }
 667
 668   //
 669   // Determine the image type by file extension:
 670   //   *.efi -> EFI Image
 671   //   *.iso -> CD/DVD Image
 672   //   *.img -> Virtual Disk Image
 673   //
 674   Status = HttpUrlGetPath (
 675              Uri,
 676              UriParser,
 677              &FilePath
 678              );
 679   if (EFI_ERROR (Status)) {
 680     return Status;
 681   }
 682
 683   FilePost = FilePath + AsciiStrLen (FilePath) - 4;
 684   if (AsciiStrCmp (FilePost, ".efi") == 0) {
 685     *ImageType = ImageTypeEfi;
 686   } else if (AsciiStrCmp (FilePost, ".iso") == 0) {
 687     *ImageType = ImageTypeVirtualCd;
 688   } else if (AsciiStrCmp (FilePost, ".img") == 0) {
 689     *ImageType = ImageTypeVirtualDisk;
 690   } else {
 691     *ImageType = ImageTypeMax;
 692   }
 693
 694   FreePool (FilePath);
 695
 696   return (*ImageType < ImageTypeMax) ? EFI_SUCCESS : EFI_NOT_FOUND;
 697 }
 698
 699 /**
 700   This function register the RAM disk info to the system.
 701
 702   @param[in]       Private         The pointer to the driver's private data.
 703   @param[in]       BufferSize      The size of Buffer in bytes.
 704   @param[in]       Buffer          The base address of the RAM disk.
 705   @param[in]       ImageType       The image type of the file in Buffer.
 706
 707   @retval EFI_SUCCESS              The RAM disk has been registered.
 708   @retval EFI_NOT_FOUND            No RAM disk protocol instances were found.
 709   @retval EFI_UNSUPPORTED          The ImageType is not supported.
 710   @retval Others                   Unexpected error happened.
 711
 712 **/
 713 EFI_STATUS
 714 HttpBootRegisterRamDisk (
 715   IN  HTTP_BOOT_PRIVATE_DATA       *Private,
 716   IN  UINTN                        BufferSize,
 717   IN  VOID                         *Buffer,
 718   IN  HTTP_BOOT_IMAGE_TYPE         ImageType
 719   )
 720 {
 721   EFI_RAM_DISK_PROTOCOL      *RamDisk;
 722   EFI_STATUS                 Status;
 723   EFI_DEVICE_PATH_PROTOCOL   *DevicePath;
 724   EFI_GUID                   *RamDiskType;
 725
 726   ASSERT (Private != NULL);
 727   ASSERT (Buffer != NULL);
 728   ASSERT (BufferSize != 0);
 729
 730   Status = gBS->LocateProtocol (&gEfiRamDiskProtocolGuid, NULL, (VOID**) &RamDisk);
 731   if (EFI_ERROR (Status)) {
 732     DEBUG ((EFI_D_ERROR, "HTTP Boot: Couldn't find the RAM Disk protocol - %r\n", Status));
 733     return Status;
 734   }
 735
 736   if (ImageType == ImageTypeVirtualCd) {
 737     RamDiskType = &gEfiVirtualCdGuid;
 738   } else if (ImageType == ImageTypeVirtualDisk) {
 739     RamDiskType = &gEfiVirtualDiskGuid;
 740   } else {
 741     return EFI_UNSUPPORTED;
 742   }
 743
 744   Status = RamDisk->Register (
 745              (UINTN)Buffer,
 746              (UINT64)BufferSize,
 747              RamDiskType,
 748              Private->UsingIpv6 ? Private->Ip6Nic->DevicePath : Private->Ip4Nic->DevicePath,
 749              &DevicePath
 750              );
 751   if (EFI_ERROR (Status)) {
 752     DEBUG ((EFI_D_ERROR, "HTTP Boot: Failed to register RAM Disk - %r\n", Status));
 753   }
 754
 755   return Status;
 756 }
 757
 758 /**
 759   Indicate if the HTTP status code indicates a redirection.
 760
 761   @param[in]  StatusCode      HTTP status code from server.
 762
 763   @return                     TRUE if it's redirection.
 764
 765 **/
 766 BOOLEAN
 767 HttpBootIsHttpRedirectStatusCode (
 768   IN   EFI_HTTP_STATUS_CODE        StatusCode
 769   )
 770 {
 771   if (StatusCode == HTTP_STATUS_301_MOVED_PERMANENTLY ||
 772       StatusCode == HTTP_STATUS_302_FOUND ||
 773       StatusCode == HTTP_STATUS_307_TEMPORARY_REDIRECT ||
 774       StatusCode == HTTP_STATUS_308_PERMANENT_REDIRECT) {
 775     return TRUE;
 776   }
 777
 778   return FALSE;
 779 }