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NetworkPkg/HttpBootDxe: Resume an interrupted boot file download.
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When the boot file download operation is interrupted for some reason,
HttpBootDxe will use HTTP Range header to try resume the download
operation reusing the bytes downloaded so far.

Signed-off-by: Leandro Gustavo Biss Becker <[email protected]>
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@leandrobecker-pst
leandrobecker-pst committed Aug 28, 2024
1 parent 1590eb1 commit cdedcae
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Showing 6 changed files with 263 additions and 22 deletions.
183 changes: 177 additions & 6 deletions NetworkPkg/HttpBootDxe/HttpBootClient.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -923,6 +923,9 @@ HttpBootGetBootFileCallback (
BufferSize has been updated with the size needed to complete
the request.
@retval EFI_ACCESS_DENIED The server needs to authenticate the client.
@retval EFI_NOT_READY Data transfer has timed-out, call HttpBootGetBootFile again to resume
the download operation using HTTP Range headers.
@retval EFI_UNSUPPORTED Some HTTP response header is not supported.
@retval Others Unexpected error happened.
**/
Expand Down Expand Up @@ -955,6 +958,10 @@ HttpBootGetBootFile (
CHAR8 BaseAuthValue[80];
EFI_HTTP_HEADER *HttpHeader;
CHAR8 *Data;
UINTN HeadersCount;
BOOLEAN ResumingOperation;
CHAR8 *ContentRangeResponseValue;
CHAR8 RangeValue[64];

ASSERT (Private != NULL);
ASSERT (Private->HttpCreated);
Expand Down Expand Up @@ -985,6 +992,16 @@ HttpBootGetBootFile (
}
}

// Check if this is a previous download that has failed and need to be resumed
if ((!HeaderOnly) &&
(Private->PartialTransferredSize > 0) &&
(Private->BootFileSize == *BufferSize))
{
ResumingOperation = TRUE;
} else {
ResumingOperation = FALSE;
}

//
// Not found in cache, try to download it through HTTP.
//
Expand Down Expand Up @@ -1014,8 +1031,23 @@ HttpBootGetBootFile (
// Accept
// User-Agent
// [Authorization]
// [Range]
// [If-Match]|[If-Unmodified-Since]
//
HttpIoHeader = HttpIoCreateHeader ((Private->AuthData != NULL) ? 4 : 3);
HeadersCount = 3;
if (Private->AuthData != NULL) {
HeadersCount++;
}

if (ResumingOperation) {
HeadersCount++;
if (Private->LastModifiedOrEtag) {
HeadersCount++;
}
}

HttpIoHeader = HttpIoCreateHeader (HeadersCount);

if (HttpIoHeader == NULL) {
Status = EFI_OUT_OF_RESOURCES;
goto ERROR_2;
Expand Down Expand Up @@ -1097,6 +1129,62 @@ HttpBootGetBootFile (
}
}

//
// Add HTTP header field 5 (optional): Range
//
if (ResumingOperation) {
// Resuming a failed download. Prepare the HTTP Range Header
Status = AsciiSPrint (
RangeValue,
sizeof (RangeValue),
"bytes=%lu-%lu",
Private->PartialTransferredSize,
Private->BootFileSize - 1
);
if (EFI_ERROR (Status)) {
goto ERROR_3;
}

Status = HttpIoSetHeader (HttpIoHeader, "Range", RangeValue);
if (EFI_ERROR (Status)) {
goto ERROR_3;
}

DEBUG (
(DEBUG_WARN | DEBUG_INFO,
"HttpBootGetBootFile: Resuming failed download. Range: %a\n",
RangeValue)
);

//
// Add HTTP header field 6 (optional): If-Match or If-Unmodified-Since
//
if (Private->LastModifiedOrEtag) {
if (Private->LastModifiedOrEtag[0] == '"') {
// An ETag value starts with "
DEBUG (
(DEBUG_WARN | DEBUG_INFO,
"HttpBootGetBootFile: If-Match=%a\n",
Private->LastModifiedOrEtag)
);
// Add If-Match header with the ETag value got from the first request.
Status = HttpIoSetHeader (HttpIoHeader, HTTP_HEADER_IF_MATCH, Private->LastModifiedOrEtag);
} else {
DEBUG (
(DEBUG_WARN | DEBUG_INFO,
"HttpBootGetBootFile: If-Unmodified-Since=%a\n",
Private->LastModifiedOrEtag)
);
// Add If-Unmodified-Since header with the timestamp value (Last-Modified) got from the first request.
Status = HttpIoSetHeader (HttpIoHeader, HTTP_HEADER_IF_UNMODIFIED_SINCE, Private->LastModifiedOrEtag);
}

if (EFI_ERROR (Status)) {
goto ERROR_3;
}
}
}

//
// 2.2 Build the rest of HTTP request info.
//
Expand Down Expand Up @@ -1245,6 +1333,62 @@ HttpBootGetBootFile (
Cache->ImageType = *ImageType;
}

// Cache ETag or Last-Modified response header value to
// be used when resuming an interrupted download.
HttpHeader = HttpFindHeader (
ResponseData->HeaderCount,
ResponseData->Headers,
HTTP_HEADER_ETAG
);
if (HttpHeader == NULL) {
HttpHeader = HttpFindHeader (
ResponseData->HeaderCount,
ResponseData->Headers,
HTTP_HEADER_LAST_MODIFIED
);
}

if (HttpHeader) {
if (Private->LastModifiedOrEtag) {
FreePool (Private->LastModifiedOrEtag);
}

Private->LastModifiedOrEtag = AllocateCopyPool (AsciiStrSize (HttpHeader->FieldValue), HttpHeader->FieldValue);
}

//
// 3.2.2 Validate the range response. If operation is being resumed,
// server must respond with Content-Range.
//
if (ResumingOperation) {
HttpHeader = HttpFindHeader (
ResponseData->HeaderCount,
ResponseData->Headers,
HTTP_HEADER_CONTENT_RANGE
);
if ((HttpHeader == NULL) ||
(AsciiStrnCmp (HttpHeader->FieldValue, "bytes", 5) != 0))
{
Status = EFI_UNSUPPORTED;
goto ERROR_5;
}

// Gets the total size of ranged data (Content-Range: <unit> <range-start>-<range-end>/<size>)
// and check if it remains the same
ContentRangeResponseValue = AsciiStrStr (HttpHeader->FieldValue, "/");
if (ContentRangeResponseValue == NULL) {
Status = EFI_INVALID_PARAMETER;
goto ERROR_5;
}

ContentRangeResponseValue++;
ContentLength = AsciiStrDecimalToUintn (ContentRangeResponseValue);
if (ContentLength != *BufferSize) {
Status = EFI_INVALID_PARAMETER;
goto ERROR_5;
}
}

//
// 3.3 Init a message-body parser from the header information.
//
Expand Down Expand Up @@ -1295,10 +1439,15 @@ HttpBootGetBootFile (
// In identity transfer-coding there is no need to parse the message body,
// just download the message body to the user provided buffer directly.
//
if (ResumingOperation && ((ContentLength + Private->PartialTransferredSize) > *BufferSize)) {
Status = EFI_INVALID_PARAMETER;
goto ERROR_6;
}

ReceivedSize = 0;
while (ReceivedSize < ContentLength) {
ResponseBody.Body = (CHAR8 *)Buffer + ReceivedSize;
ResponseBody.BodyLength = *BufferSize - ReceivedSize;
ResponseBody.Body = (CHAR8 *)Buffer + (ReceivedSize + Private->PartialTransferredSize);
ResponseBody.BodyLength = *BufferSize - (ReceivedSize + Private->PartialTransferredSize);
Status = HttpIoRecvResponse (
&Private->HttpIo,
FALSE,
Expand All @@ -1309,6 +1458,21 @@ HttpBootGetBootFile (
Status = ResponseBody.Status;
}

if ((Status == EFI_TIMEOUT) || (Status == EFI_DEVICE_ERROR)) {
// Indicate to the caller that operation may be retried to resume the download.
// We will not check if server sent Accept-Ranges header, because some back-ends
// do not report this header, even when supporting it. Know example: CloudFlare CDN Cache.
Status = EFI_NOT_READY;
Private->PartialTransferredSize = ReceivedSize;
DEBUG (
(
DEBUG_WARN | DEBUG_INFO,
"HttpBootGetBootFile: Transfer error. Bytes transferred so far: %lu.\n",
ReceivedSize
)
);
}

goto ERROR_6;
}

Expand All @@ -1326,6 +1490,9 @@ HttpBootGetBootFile (
}
}
}

// download completed, there is no more partial data
Private->PartialTransferredSize = 0;
} else {
//
// In "chunked" transfer-coding mode, so we need to parse the received
Expand Down Expand Up @@ -1385,9 +1552,13 @@ HttpBootGetBootFile (
//
// 3.5 Message-body receive & parse is completed, we should be able to get the file size now.
//
Status = HttpGetEntityLength (Parser, &ContentLength);
if (EFI_ERROR (Status)) {
goto ERROR_6;
if (!ResumingOperation) {
Status = HttpGetEntityLength (Parser, &ContentLength);
if (EFI_ERROR (Status)) {
goto ERROR_6;
}
} else {
ContentLength = Private->BootFileSize;
}

if (*BufferSize < ContentLength) {
Expand Down
3 changes: 3 additions & 0 deletions NetworkPkg/HttpBootDxe/HttpBootClient.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -108,6 +108,9 @@ HttpBootCreateHttpIo (
BufferSize has been updated with the size needed to complete
the request.
@retval EFI_ACCESS_DENIED The server needs to authenticate the client.
@retval EFI_NOT_READY Data transfer has timed-out, call HttpBootGetBootFile again to resume
the download operation using HTTP Range headers.
@retval EFI_UNSUPPORTED Some HTTP response header is not supported.
@retval Others Unexpected error happened.
**/
Expand Down
2 changes: 2 additions & 0 deletions NetworkPkg/HttpBootDxe/HttpBootDxe.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -214,6 +214,8 @@ struct _HTTP_BOOT_PRIVATE_DATA {
CHAR8 *BootFileUri;
VOID *BootFileUriParser;
UINTN BootFileSize;
UINTN PartialTransferredSize;
CHAR8 *LastModifiedOrEtag;
BOOLEAN NoGateway;
HTTP_BOOT_IMAGE_TYPE ImageType;

Expand Down
6 changes: 4 additions & 2 deletions NetworkPkg/HttpBootDxe/HttpBootDxe.inf
View file
Original file line number Diff line number Diff line change
Expand Up @@ -95,8 +95,10 @@
gEfiAdapterInfoUndiIpv6SupportGuid ## SOMETIMES_CONSUMES ## GUID

[Pcd]
gEfiNetworkPkgTokenSpaceGuid.PcdAllowHttpConnections ## CONSUMES
gEfiNetworkPkgTokenSpaceGuid.PcdHttpIoTimeout ## CONSUMES
gEfiNetworkPkgTokenSpaceGuid.PcdAllowHttpConnections ## CONSUMES
gEfiNetworkPkgTokenSpaceGuid.PcdHttpIoTimeout ## CONSUMES
gEfiNetworkPkgTokenSpaceGuid.PcdMaxHttpResumeRetries ## CONSUMES
gEfiNetworkPkgTokenSpaceGuid.PcdHttpDelayBetweenResumeRetries ## CONSUMES

[UserExtensions.TianoCore."ExtraFiles"]
HttpBootDxeExtra.uni
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