internal unsafe void SendError(ulong requestId, int httpStatusCode, IList <string>?authChallenges = null)
{
HttpApiTypes.HTTP_RESPONSE_V2 httpResponse = new HttpApiTypes.HTTP_RESPONSE_V2();
httpResponse.Response_V1.Version = new HttpApiTypes.HTTP_VERSION();
httpResponse.Response_V1.Version.MajorVersion = (ushort)1;
httpResponse.Response_V1.Version.MinorVersion = (ushort)1;
List <GCHandle>?pinnedHeaders = null;
GCHandle gcHandle;
try
{
// Copied from the multi-value headers section of SerializeHeaders
if (authChallenges != null && authChallenges.Count > 0)
{
pinnedHeaders = new List <GCHandle>(authChallenges.Count + 3);
HttpApiTypes.HTTP_RESPONSE_INFO[] knownHeaderInfo = new HttpApiTypes.HTTP_RESPONSE_INFO[1];
gcHandle = GCHandle.Alloc(knownHeaderInfo, GCHandleType.Pinned);
pinnedHeaders.Add(gcHandle);
httpResponse.pResponseInfo = (HttpApiTypes.HTTP_RESPONSE_INFO *)gcHandle.AddrOfPinnedObject();
knownHeaderInfo[httpResponse.ResponseInfoCount].Type = HttpApiTypes.HTTP_RESPONSE_INFO_TYPE.HttpResponseInfoTypeMultipleKnownHeaders;
knownHeaderInfo[httpResponse.ResponseInfoCount].Length =
(uint)Marshal.SizeOf <HttpApiTypes.HTTP_MULTIPLE_KNOWN_HEADERS>();
HttpApiTypes.HTTP_MULTIPLE_KNOWN_HEADERS header = new HttpApiTypes.HTTP_MULTIPLE_KNOWN_HEADERS();
header.HeaderId = HttpApiTypes.HTTP_RESPONSE_HEADER_ID.Enum.HttpHeaderWwwAuthenticate;
header.Flags = HttpApiTypes.HTTP_RESPONSE_INFO_FLAGS.PreserveOrder; // The docs say this is for www-auth only.
HttpApiTypes.HTTP_KNOWN_HEADER[] nativeHeaderValues = new HttpApiTypes.HTTP_KNOWN_HEADER[authChallenges.Count];
gcHandle = GCHandle.Alloc(nativeHeaderValues, GCHandleType.Pinned);
pinnedHeaders.Add(gcHandle);
header.KnownHeaders = (HttpApiTypes.HTTP_KNOWN_HEADER *)gcHandle.AddrOfPinnedObject();
for (int headerValueIndex = 0; headerValueIndex < authChallenges.Count; headerValueIndex++)
{
// Add Value
string headerValue = authChallenges[headerValueIndex];
byte[] bytes = HeaderEncoding.GetBytes(headerValue);
nativeHeaderValues[header.KnownHeaderCount].RawValueLength = (ushort)bytes.Length;
gcHandle = GCHandle.Alloc(bytes, GCHandleType.Pinned);
pinnedHeaders.Add(gcHandle);
nativeHeaderValues[header.KnownHeaderCount].pRawValue = (byte *)gcHandle.AddrOfPinnedObject();
header.KnownHeaderCount++;
}
// This type is a struct, not an object, so pinning it causes a boxed copy to be created. We can't do that until after all the fields are set.
gcHandle = GCHandle.Alloc(header, GCHandleType.Pinned);
pinnedHeaders.Add(gcHandle);
knownHeaderInfo[0].pInfo = (HttpApiTypes.HTTP_MULTIPLE_KNOWN_HEADERS *)gcHandle.AddrOfPinnedObject();
httpResponse.ResponseInfoCount = 1;
}
httpResponse.Response_V1.StatusCode = (ushort)httpStatusCode;
string?statusDescription = HttpReasonPhrase.Get(httpStatusCode);
uint dataWritten = 0;
uint statusCode;
byte[] byteReason = statusDescription != null?HeaderEncoding.GetBytes(statusDescription) : Array.Empty <byte>();
fixed(byte *pReason = byteReason)
{
httpResponse.Response_V1.pReason = (byte *)pReason;
httpResponse.Response_V1.ReasonLength = (ushort)byteReason.Length;
byte[] byteContentLength = new byte[] { (byte)'0' };
fixed(byte *pContentLength = byteContentLength)
{
(&httpResponse.Response_V1.Headers.KnownHeaders)[(int)HttpSysResponseHeader.ContentLength].pRawValue = (byte *)pContentLength;
(&httpResponse.Response_V1.Headers.KnownHeaders)[(int)HttpSysResponseHeader.ContentLength].RawValueLength = (ushort)byteContentLength.Length;
httpResponse.Response_V1.Headers.UnknownHeaderCount = 0;
statusCode =
HttpApi.HttpSendHttpResponse(
_requestQueue.Handle,
requestId,
0,
&httpResponse,
null,
&dataWritten,
IntPtr.Zero,
0,
SafeNativeOverlapped.Zero,
IntPtr.Zero);
}
}
if (statusCode != UnsafeNclNativeMethods.ErrorCodes.ERROR_SUCCESS)
{
// if we fail to send a 401 something's seriously wrong, abort the request
HttpApi.HttpCancelHttpRequest(_requestQueue.Handle, requestId, IntPtr.Zero);
}
}
finally
{
if (pinnedHeaders != null)
{
foreach (GCHandle handle in pinnedHeaders)
{
if (handle.IsAllocated)
{
handle.Free();
}
}
}
}
}
/*
* 12.3
* HttpSendHttpResponse() and HttpSendResponseEntityBody() Flag Values.
* The following flags can be used on calls to HttpSendHttpResponse() and HttpSendResponseEntityBody() API calls:
*
#define HTTP_SEND_RESPONSE_FLAG_DISCONNECT 0x00000001
#define HTTP_SEND_RESPONSE_FLAG_MORE_DATA 0x00000002
#define HTTP_SEND_RESPONSE_FLAG_RAW_HEADER 0x00000004
#define HTTP_SEND_RESPONSE_FLAG_VALID 0x00000007
*
* HTTP_SEND_RESPONSE_FLAG_DISCONNECT:
* specifies that the network connection should be disconnected immediately after
* sending the response, overriding the HTTP protocol's persistent connection features.
* HTTP_SEND_RESPONSE_FLAG_MORE_DATA:
* specifies that additional entity body data will be sent by the caller. Thus,
* the last call HttpSendResponseEntityBody for a RequestId, will have this flag reset.
* HTTP_SEND_RESPONSE_RAW_HEADER:
* specifies that a caller of HttpSendResponseEntityBody() is intentionally omitting
* a call to HttpSendHttpResponse() in order to bypass normal header processing. The
* actual HTTP header will be generated by the application and sent as entity body.
* This flag should be passed on the first call to HttpSendResponseEntityBody, and
* not after. Thus, flag is not applicable to HttpSendHttpResponse.
*/
// TODO: Consider using HTTP_SEND_RESPONSE_RAW_HEADER with HttpSendResponseEntityBody instead of calling HttpSendHttpResponse.
// This will give us more control of the bytes that hit the wire, including encodings, HTTP 1.0, etc..
// It may also be faster to do this work in managed code and then pass down only one buffer.
// What would we loose by bypassing HttpSendHttpResponse?
//
// TODO: Consider using the HTTP_SEND_RESPONSE_FLAG_BUFFER_DATA flag for most/all responses rather than just Opaque.
internal unsafe uint SendHeaders(HttpApiTypes.HTTP_DATA_CHUNK[] dataChunks,
ResponseStreamAsyncResult asyncResult,
HttpApiTypes.HTTP_FLAGS flags,
bool isOpaqueUpgrade)
{
Debug.Assert(!HasStarted, "HttpListenerResponse::SendHeaders()|SentHeaders is true.");
_responseState = ResponseState.Started;
var reasonPhrase = GetReasonPhrase(StatusCode);
uint statusCode;
uint bytesSent;
List <GCHandle> pinnedHeaders = SerializeHeaders(isOpaqueUpgrade);
try
{
if (dataChunks != null)
{
if (pinnedHeaders == null)
{
pinnedHeaders = new List <GCHandle>();
}
var handle = GCHandle.Alloc(dataChunks, GCHandleType.Pinned);
pinnedHeaders.Add(handle);
_nativeResponse.Response_V1.EntityChunkCount = (ushort)dataChunks.Length;
_nativeResponse.Response_V1.pEntityChunks = (HttpApiTypes.HTTP_DATA_CHUNK *)handle.AddrOfPinnedObject();
}
else if (asyncResult != null && asyncResult.DataChunks != null)
{
_nativeResponse.Response_V1.EntityChunkCount = asyncResult.DataChunkCount;
_nativeResponse.Response_V1.pEntityChunks = asyncResult.DataChunks;
}
else
{
_nativeResponse.Response_V1.EntityChunkCount = 0;
_nativeResponse.Response_V1.pEntityChunks = null;
}
var cachePolicy = new HttpApiTypes.HTTP_CACHE_POLICY();
if (_cacheTtl.HasValue && _cacheTtl.Value > TimeSpan.Zero)
{
cachePolicy.Policy = HttpApiTypes.HTTP_CACHE_POLICY_TYPE.HttpCachePolicyTimeToLive;
cachePolicy.SecondsToLive = (uint)Math.Min(_cacheTtl.Value.Ticks / TimeSpan.TicksPerSecond, Int32.MaxValue);
}
byte[] reasonPhraseBytes = HeaderEncoding.GetBytes(reasonPhrase);
fixed(byte *pReasonPhrase = reasonPhraseBytes)
{
_nativeResponse.Response_V1.ReasonLength = (ushort)reasonPhraseBytes.Length;
_nativeResponse.Response_V1.pReason = (byte *)pReasonPhrase;
fixed(HttpApiTypes.HTTP_RESPONSE_V2 *pResponse = &_nativeResponse)
{
statusCode =
HttpApi.HttpSendHttpResponse(
RequestContext.Server.RequestQueue.Handle,
Request.RequestId,
(uint)flags,
pResponse,
&cachePolicy,
&bytesSent,
IntPtr.Zero,
0,
asyncResult == null ? SafeNativeOverlapped.Zero : asyncResult.NativeOverlapped,
IntPtr.Zero);
// GoAway is only supported on later versions. Retry.
if (statusCode == ErrorCodes.ERROR_INVALID_PARAMETER &&
(flags & HttpApiTypes.HTTP_FLAGS.HTTP_SEND_RESPONSE_FLAG_GOAWAY) != 0)
{
flags &= ~HttpApiTypes.HTTP_FLAGS.HTTP_SEND_RESPONSE_FLAG_GOAWAY;
statusCode =
HttpApi.HttpSendHttpResponse(
RequestContext.Server.RequestQueue.Handle,
Request.RequestId,
(uint)flags,
pResponse,
&cachePolicy,
&bytesSent,
IntPtr.Zero,
0,
asyncResult == null ? SafeNativeOverlapped.Zero : asyncResult.NativeOverlapped,
IntPtr.Zero);
// Succeeded without GoAway, disable them.
if (statusCode != ErrorCodes.ERROR_INVALID_PARAMETER)
{
SupportsGoAway = false;
}
}
if (asyncResult != null &&
statusCode == ErrorCodes.ERROR_SUCCESS &&
HttpSysListener.SkipIOCPCallbackOnSuccess)
{
asyncResult.BytesSent = bytesSent;
// The caller will invoke IOCompleted
}
}
}
}
finally
{
FreePinnedHeaders(pinnedHeaders);
}
return(statusCode);
}