public override void Write(byte[] buffer, int offset, int size)
{
if (Logging.On)
{
Logging.Enter(Logging.HttpListener, this, "Write", "");
}
GlobalLog.Print("HttpResponseStream#" + ValidationHelper.HashString(this) + "::Write() buffer.Length:" + buffer.Length + " size:" + size + " offset:" + offset);
if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
if (offset < 0 || offset > buffer.Length)
{
throw new ArgumentOutOfRangeException("offset");
}
if (size < 0 || size > buffer.Length - offset)
{
throw new ArgumentOutOfRangeException("size");
}
UnsafeNclNativeMethods.HttpApi.HTTP_FLAGS flags = ComputeLeftToWrite();
if (m_Closed || (size == 0 && m_LeftToWrite != 0))
{
if (Logging.On)
{
Logging.Exit(Logging.HttpListener, this, "Write", "");
}
return;
}
if (m_LeftToWrite >= 0 && size > m_LeftToWrite)
{
throw new ProtocolViolationException(SR.GetString(SR.net_entitytoobig));
}
uint statusCode;
uint dataToWrite = (uint)size;
SafeLocalFree bufferAsIntPtr = null;
IntPtr pBufferAsIntPtr = IntPtr.Zero;
bool sentHeaders = m_HttpContext.Response.SentHeaders;
try {
if (size == 0)
{
statusCode = m_HttpContext.Response.SendHeaders(null, null, flags, false);
}
else
{
fixed(byte *pDataBuffer = buffer)
{
byte *pBuffer = pDataBuffer;
if (m_HttpContext.Response.BoundaryType == BoundaryType.Chunked)
{
//
string chunkHeader = size.ToString("x", CultureInfo.InvariantCulture);
dataToWrite = dataToWrite + (uint)(chunkHeader.Length + 4);
bufferAsIntPtr = SafeLocalFree.LocalAlloc((int)dataToWrite);
pBufferAsIntPtr = bufferAsIntPtr.DangerousGetHandle();
for (int i = 0; i < chunkHeader.Length; i++)
{
Marshal.WriteByte(pBufferAsIntPtr, i, (byte)chunkHeader[i]);
}
Marshal.WriteInt16(pBufferAsIntPtr, chunkHeader.Length, 0x0A0D);
Marshal.Copy(buffer, offset, IntPtrHelper.Add(pBufferAsIntPtr, chunkHeader.Length + 2), size);
Marshal.WriteInt16(pBufferAsIntPtr, (int)(dataToWrite - 2), 0x0A0D);
pBuffer = (byte *)pBufferAsIntPtr;
offset = 0;
}
UnsafeNclNativeMethods.HttpApi.HTTP_DATA_CHUNK dataChunk = new UnsafeNclNativeMethods.HttpApi.HTTP_DATA_CHUNK();
dataChunk.DataChunkType = UnsafeNclNativeMethods.HttpApi.HTTP_DATA_CHUNK_TYPE.HttpDataChunkFromMemory;
dataChunk.pBuffer = (byte *)(pBuffer + offset);
dataChunk.BufferLength = dataToWrite;
flags |= m_LeftToWrite == size ? UnsafeNclNativeMethods.HttpApi.HTTP_FLAGS.NONE : UnsafeNclNativeMethods.HttpApi.HTTP_FLAGS.HTTP_SEND_RESPONSE_FLAG_MORE_DATA;
if (!sentHeaders)
{
statusCode = m_HttpContext.Response.SendHeaders(&dataChunk, null, flags, false);
}
else
{
GlobalLog.Print("HttpResponseStream#" + ValidationHelper.HashString(this) + "::Write() calling UnsafeNclNativeMethods.HttpApi.HttpSendResponseEntityBody");
statusCode =
UnsafeNclNativeMethods.HttpApi.HttpSendResponseEntityBody(
m_HttpContext.RequestQueueHandle,
m_HttpContext.RequestId,
(uint)flags,
1,
&dataChunk,
null,
SafeLocalFree.Zero,
0,
null,
null);
GlobalLog.Print("HttpResponseStream#" + ValidationHelper.HashString(this) + "::Write() call to UnsafeNclNativeMethods.HttpApi.HttpSendResponseEntityBody returned:" + statusCode);
if (m_HttpContext.Listener.IgnoreWriteExceptions)
{
GlobalLog.Print("HttpResponseStream#" + ValidationHelper.HashString(this) + "::Write() suppressing error");
statusCode = UnsafeNclNativeMethods.ErrorCodes.ERROR_SUCCESS;
}
}
}
}
}
finally {
if (bufferAsIntPtr != null)
{
// free unmanaged buffer
bufferAsIntPtr.Close();
}
}
if (statusCode != UnsafeNclNativeMethods.ErrorCodes.ERROR_SUCCESS && statusCode != UnsafeNclNativeMethods.ErrorCodes.ERROR_HANDLE_EOF)
{
Exception exception = new HttpListenerException((int)statusCode);
if (Logging.On)
{
Logging.Exception(Logging.HttpListener, this, "Write", exception);
}
m_Closed = true;
m_HttpContext.Abort();
throw exception;
}
UpdateAfterWrite(dataToWrite);
if (Logging.On)
{
Logging.Dump(Logging.HttpListener, this, "Write", buffer, offset, (int)dataToWrite);
}
if (Logging.On)
{
Logging.Exit(Logging.HttpListener, this, "Write", "");
}
}
internal static IPHostEntry NativeToHostEntry(IntPtr nativePointer) {
#endif
//
// marshal pointer to struct
//
hostent Host = (hostent)Marshal.PtrToStructure(nativePointer, typeof(hostent));
IPHostEntry HostEntry = new IPHostEntry();
if (Host.h_name != IntPtr.Zero) {
HostEntry.HostName = Marshal.PtrToStringAnsi(Host.h_name);
GlobalLog.Print("HostEntry.HostName: " + HostEntry.HostName);
}
// decode h_addr_list to ArrayList of IP addresses.
// The h_addr_list field is really a pointer to an array of pointers
// to IP addresses. Loop through the array, and while the pointer
// isn't NULL read the IP address, convert it to an IPAddress class,
// and add it to the list.
ArrayList TempList = new ArrayList();
int IPAddressToAdd;
string AliasToAdd;
IntPtr currentArrayElement;
//
// get the first pointer in the array
//
currentArrayElement = Host.h_addr_list;
nativePointer = Marshal.ReadIntPtr(currentArrayElement);
while (nativePointer != IntPtr.Zero) {
//
// if it's not null it points to an IPAddress,
// read it...
//
IPAddressToAdd = Marshal.ReadInt32(nativePointer);
#if BIGENDIAN
// IP addresses from native code are always a byte array
// converted to int. We need to convert the address into
// a uniform integer value.
IPAddressToAdd = (int)( ((uint)IPAddressToAdd << 24) |
(((uint)IPAddressToAdd & 0x0000FF00) << 8) |
(((uint)IPAddressToAdd >> 8) & 0x0000FF00) |
((uint)IPAddressToAdd >> 24) );
#endif
GlobalLog.Print("currentArrayElement: " + currentArrayElement.ToString() + " nativePointer: " + nativePointer.ToString() + " IPAddressToAdd:" + IPAddressToAdd.ToString());
//
// ...and add it to the list
//
TempList.Add(new IPAddress(IPAddressToAdd));
//
// now get the next pointer in the array and start over
//
currentArrayElement = IntPtrHelper.Add(currentArrayElement, IntPtr.Size);
nativePointer = Marshal.ReadIntPtr(currentArrayElement);
}
HostEntry.AddressList = new IPAddress[TempList.Count];
TempList.CopyTo(HostEntry.AddressList, 0);
//
// Now do the same thing for the aliases.
//
TempList.Clear();
currentArrayElement = Host.h_aliases;
nativePointer = Marshal.ReadIntPtr(currentArrayElement);
while (nativePointer != IntPtr.Zero) {
GlobalLog.Print("currentArrayElement: " + ((long)currentArrayElement).ToString() + "nativePointer: " + ((long)nativePointer).ToString());
//
// if it's not null it points to an Alias,
// read it...
//
AliasToAdd = Marshal.PtrToStringAnsi(nativePointer);
//
// ...and add it to the list
//
TempList.Add(AliasToAdd);
//
// now get the next pointer in the array and start over
//
currentArrayElement = IntPtrHelper.Add(currentArrayElement, IntPtr.Size);
nativePointer = Marshal.ReadIntPtr(currentArrayElement);
}
HostEntry.Aliases = new string[TempList.Count];
TempList.CopyTo(HostEntry.Aliases, 0);
return HostEntry;
} // NativeToHostEntry
/*++
*
* Routine Description:
*
* Takes a native pointer (expressed as an int) to a hostent structure,
* and converts the information in their to an IPHostEntry class. This
* involves walking through an array of native pointers, and a temporary
* ArrayList object is used in doing this.
*
* Arguments:
*
* nativePointer - Native pointer to hostent structure.
*
*
*
* Return Value:
*
* An IPHostEntry structure.
*
* --*/
private static IPHostEntry NativeToHostEntry(IntPtr nativePointer)
{
//
// marshal pointer to struct
//
hostent Host = Marshal.PtrToStructure <hostent>(nativePointer);
IPHostEntry HostEntry = new IPHostEntry();
if (Host.h_name != IntPtr.Zero)
{
HostEntry.HostName = Marshal.PtrToStringAnsi(Host.h_name);
if (NetEventSource.IsEnabled)
{
NetEventSource.Info(null, $"HostEntry.HostName: {HostEntry.HostName}");
}
}
// decode h_addr_list to ArrayList of IP addresses.
// The h_addr_list field is really a pointer to an array of pointers
// to IP addresses. Loop through the array, and while the pointer
// isn't NULL read the IP address, convert it to an IPAddress class,
// and add it to the list.
var TempIPAddressList = new List <IPAddress>();
int IPAddressToAdd;
string AliasToAdd;
IntPtr currentArrayElement;
//
// get the first pointer in the array
//
currentArrayElement = Host.h_addr_list;
nativePointer = Marshal.ReadIntPtr(currentArrayElement);
while (nativePointer != IntPtr.Zero)
{
//
// if it's not null it points to an IPAddress,
// read it...
//
IPAddressToAdd = Marshal.ReadInt32(nativePointer);
#if BIGENDIAN
// IP addresses from native code are always a byte array
// converted to int. We need to convert the address into
// a uniform integer value.
IPAddressToAdd = (int)(((uint)IPAddressToAdd << 24) |
(((uint)IPAddressToAdd & 0x0000FF00) << 8) |
(((uint)IPAddressToAdd >> 8) & 0x0000FF00) |
((uint)IPAddressToAdd >> 24));
#endif
if (NetEventSource.IsEnabled)
{
NetEventSource.Info(null, $"currentArrayElement:{currentArrayElement} nativePointer:{nativePointer} IPAddressToAdd:{IPAddressToAdd}");
}
//
// ...and add it to the list
//
TempIPAddressList.Add(new IPAddress((long)IPAddressToAdd & 0x0FFFFFFFF));
//
// now get the next pointer in the array and start over
//
currentArrayElement = IntPtrHelper.Add(currentArrayElement, IntPtr.Size);
nativePointer = Marshal.ReadIntPtr(currentArrayElement);
}
HostEntry.AddressList = TempIPAddressList.ToArray();
//
// Now do the same thing for the aliases.
//
var TempAliasList = new List <string>();
currentArrayElement = Host.h_aliases;
nativePointer = Marshal.ReadIntPtr(currentArrayElement);
while (nativePointer != IntPtr.Zero)
{
if (NetEventSource.IsEnabled)
{
NetEventSource.Info(null, $"currentArrayElement:{currentArrayElement} nativePointer:{nativePointer}");
}
//
// if it's not null it points to an Alias,
// read it...
//
AliasToAdd = Marshal.PtrToStringAnsi(nativePointer);
//
// ...and add it to the list
//
TempAliasList.Add(AliasToAdd);
//
// now get the next pointer in the array and start over
//
currentArrayElement = IntPtrHelper.Add(currentArrayElement, IntPtr.Size);
nativePointer = Marshal.ReadIntPtr(currentArrayElement);
}
HostEntry.Aliases = TempAliasList.ToArray();
return(HostEntry);
} // NativeToHostEntry
public override unsafe void Write(byte[] buffer, int offset, int size)
{
if (Logging.On)
{
Logging.Enter(Logging.HttpListener, this, "Write", "");
}
if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
if ((offset < 0) || (offset > buffer.Length))
{
throw new ArgumentOutOfRangeException("offset");
}
if ((size < 0) || (size > (buffer.Length - offset)))
{
throw new ArgumentOutOfRangeException("size");
}
UnsafeNclNativeMethods.HttpApi.HTTP_FLAGS flags = this.ComputeLeftToWrite();
if (this.m_Closed || ((size == 0) && (this.m_LeftToWrite != 0L)))
{
if (Logging.On)
{
Logging.Exit(Logging.HttpListener, this, "Write", "");
}
}
else
{
uint num;
if ((this.m_LeftToWrite >= 0L) && (size > this.m_LeftToWrite))
{
throw new ProtocolViolationException(SR.GetString("net_entitytoobig"));
}
uint dataWritten = (uint)size;
SafeLocalFree free = null;
IntPtr zero = IntPtr.Zero;
bool sentHeaders = this.m_HttpContext.Response.SentHeaders;
try
{
if (size == 0)
{
num = this.m_HttpContext.Response.SendHeaders(null, null, flags);
}
else
{
try
{
byte[] buffer2;
if (((buffer2 = buffer) == null) || (buffer2.Length == 0))
{
numRef = null;
goto Label_0109;
}
fixed(byte *numRef = buffer2)
{
byte *numPtr;
Label_0109:
numPtr = numRef;
if (this.m_HttpContext.Response.BoundaryType == BoundaryType.Chunked)
{
string str = size.ToString("x", CultureInfo.InvariantCulture);
dataWritten += (uint)(str.Length + 4);
free = SafeLocalFree.LocalAlloc((int)dataWritten);
zero = free.DangerousGetHandle();
for (int i = 0; i < str.Length; i++)
{
Marshal.WriteByte(zero, i, (byte)str[i]);
}
Marshal.WriteInt16(zero, str.Length, (short)0xa0d);
Marshal.Copy(buffer, offset, IntPtrHelper.Add(zero, str.Length + 2), size);
Marshal.WriteInt16(zero, ((int)dataWritten) - 2, (short)0xa0d);
numPtr = (byte *)zero;
offset = 0;
}
UnsafeNclNativeMethods.HttpApi.HTTP_DATA_CHUNK pDataChunk = new UnsafeNclNativeMethods.HttpApi.HTTP_DATA_CHUNK {
DataChunkType = UnsafeNclNativeMethods.HttpApi.HTTP_DATA_CHUNK_TYPE.HttpDataChunkFromMemory,
pBuffer = numPtr + offset,
BufferLength = dataWritten
};
flags |= (this.m_LeftToWrite == size) ? UnsafeNclNativeMethods.HttpApi.HTTP_FLAGS.NONE : UnsafeNclNativeMethods.HttpApi.HTTP_FLAGS.HTTP_SEND_RESPONSE_FLAG_MORE_DATA;
if (!sentHeaders)
{
num = this.m_HttpContext.Response.SendHeaders(&pDataChunk, null, flags);
}
else
{
num = UnsafeNclNativeMethods.HttpApi.HttpSendResponseEntityBody(this.m_HttpContext.RequestQueueHandle, this.m_HttpContext.RequestId, (uint)flags, 1, &pDataChunk, null, SafeLocalFree.Zero, 0, null, null);
if (this.m_HttpContext.Listener.IgnoreWriteExceptions)
{
num = 0;
}
}
}
}
finally
{
numRef = null;
}
}
}
finally
{
if (free != null)
{
free.Close();
}
}
switch (num)
{
case 0:
case 0x26:
this.UpdateAfterWrite(dataWritten);
if (Logging.On)
{
Logging.Dump(Logging.HttpListener, this, "Write", buffer, offset, (int)dataWritten);
}
if (Logging.On)
{
Logging.Exit(Logging.HttpListener, this, "Write", "");
}
return;
}
Exception e = new HttpListenerException((int)num);
if (Logging.On)
{
Logging.Exception(Logging.HttpListener, this, "Write", e);
}
this.m_HttpContext.Abort();
throw e;
}
}
} // Position
//
// write a chunk of data to ul
//
public override void Write(
byte[] buffer,
int offset,
int count)
{
GlobalLog.Print("ListenerResponseStream.WriteCore() offset: " + Convert.ToString(offset) + " count:" + Convert.ToString(count));
if (m_ContentLength != -1 && m_ContentLength < count)
{
//
// user can't send more data than specified in the ContentLength
//
throw new ProtocolViolationException(SR.GetString(SR.net_entitytoobig));
}
int DataToWrite = count;
GCHandle PinnedBuffer = new GCHandle();
IntPtr AddrOfPinnedBuffer = IntPtr.Zero;
if (m_SendChunked)
{
string ChunkHeader = "0x" + Convert.ToString(count, 16);
DataToWrite += ChunkHeader.Length + 4;
AddrOfPinnedBuffer = Marshal.AllocHGlobal(DataToWrite);
Marshal.Copy(ChunkHeader.ToCharArray(), 0, AddrOfPinnedBuffer, ChunkHeader.Length);
Marshal.WriteInt16(AddrOfPinnedBuffer, ChunkHeader.Length, 0x0A0D);
Marshal.Copy((byte[])buffer, offset, IntPtrHelper.Add(AddrOfPinnedBuffer, ChunkHeader.Length + 2), count);
Marshal.WriteInt16(AddrOfPinnedBuffer, DataToWrite - 2, 0x0A0D);
}
else
{
//
// pin the buffer and make an unmanaged call to the driver to
// write more entity body
//
PinnedBuffer = GCHandle.Alloc(buffer, GCHandleType.Pinned);
AddrOfPinnedBuffer = PinnedBuffer.AddrOfPinnedObject();
}
//
// set up a UL_DATA_CHUNK structure to pass down to UL with pointers
// to data to be written
//
IntPtr AddrOfPinnedEntityChunks = Marshal.AllocHGlobal(32);
//
// AddrOfPinnedBuffer and count go into a pEntityChunks structure
//
Marshal.WriteInt64(AddrOfPinnedEntityChunks, 0, 0);
Marshal.WriteIntPtr(AddrOfPinnedEntityChunks, 8, AddrOfPinnedBuffer);
Marshal.WriteInt32(AddrOfPinnedEntityChunks, 12, DataToWrite);
Marshal.WriteInt64(AddrOfPinnedEntityChunks, 16, 0);
Marshal.WriteInt64(AddrOfPinnedEntityChunks, 24, 0);
GlobalLog.Print("Calling UlSendHttpResponseEntityBody: AddrOfPinnedEntityChunks:" + Convert.ToString(AddrOfPinnedEntityChunks)
+ " AddrOfPinnedBuffer:" + Convert.ToString(AddrOfPinnedBuffer)
+ " DataToWrite:" + Convert.ToString(DataToWrite));
//
// issue unmanaged blocking call
//
int DataWritten = 0;
int result =
ComNetOS.IsWinNt ?
UlSysApi.UlSendEntityBody(
m_AppPoolHandle,
m_RequestId,
UlConstants.UL_SEND_RESPONSE_FLAG_MORE_DATA,
1,
AddrOfPinnedEntityChunks,
ref DataWritten,
IntPtr.Zero)
:
UlVxdApi.UlSendHttpResponseEntityBody(
m_AppPoolHandle,
m_RequestId,
0,
1,
AddrOfPinnedEntityChunks,
ref DataWritten,
IntPtr.Zero);
if (m_SendChunked)
{
//
// data was copied into an unmanaged buffer, free it
//
Marshal.FreeHGlobal(AddrOfPinnedBuffer);
}
else
{
//
// data wasn't copied unpin the pinned buffer
//
PinnedBuffer.Free();
}
Marshal.FreeHGlobal(AddrOfPinnedEntityChunks);
GlobalLog.Print("UlSendHttpResponseEntityBody() DataWritten:" + Convert.ToString(DataWritten) + " DataToWrite:" + Convert.ToString(DataToWrite));
if (result != NativeMethods.ERROR_SUCCESS) //Win32.ERROR_CANCELLED || Win32.ERROR_BAD_COMMAND || NativeMethods.ERROR_INVALID_PARAMETER
{
throw new ProtocolViolationException(SR.GetString(SR.net_connclosed) + Convert.ToString(result));
}
//
// double check the number of bytes written
//
if (DataWritten != DataToWrite)
{
throw new InvalidOperationException("sync UlSendHttpResponseEntityBody() failed to write all the data" +
" count:" + Convert.ToString(count) +
" DataWritten:" + Convert.ToString(DataWritten) +
" DataToWrite:" + Convert.ToString(DataToWrite) +
" m_AppPoolHandle:" + Convert.ToString(m_AppPoolHandle) +
" m_RequestId:" + Convert.ToString(m_RequestId) +
" err#" + Convert.ToString(result));
}
if (result != NativeMethods.ERROR_SUCCESS && result != NativeMethods.ERROR_HANDLE_EOF)
{
//
// Consider: move all Exception string to system.txt for localization
//
throw new InvalidOperationException("sync UlSendHttpResponseEntityBody() failed, err#" + Convert.ToString(result));
}
if (m_ContentLength != -1)
{
//
// keep track of the data transferred
//
m_ContentLength -= count;
if (m_ContentLength == 0)
{
//
// I should be able to call Close() at this point
//
}
}
return; // DataToWrite;
} // Write()
BeginGetRequest(
AsyncCallback requestCallback,
Object stateObject)
{
//
// Validation
//
if (m_AppPoolHandle == NativeMethods.INVALID_HANDLE_VALUE)
{
throw new InvalidOperationException("The AppPool handle is invalid");
}
//
// prepare the ListenerAsyncResult object ( this will have it's own
// event that the user can wait on for IO completion - which means we
// need to signal it when IO completes )
//
GlobalLog.Print("BeginGetRequest() creating ListenerAsyncResult");
ListenerAsyncResult AResult = new ListenerAsyncResult(
stateObject,
requestCallback);
AutoResetEvent m_Event = new AutoResetEvent(false);
Marshal.WriteIntPtr(
AResult.m_Overlapped,
Win32.OverlappedhEventOffset,
m_Event.Handle);
//
// issue unmanaged call until we read enough data:
// usually starting with a InitialBufferSize==4096 bytes we should be
// able to get all the headers ( and part of the entity body, if any
// is present ), if we don't, if the call didn't fail for othe reasons,
// we get indication in BytesReturned, on how big the buffer should be
// to receive the data available, so usually the second call will
// succeed, but we have to consider the case of two competing calls
// for the same RequestId, and that's why we need a loop and not just
// a try/retry-expecting-success fashion
//
int result;
for (;;)
{
//
// check if we're in a healthy state
//
if (AResult.m_Retries++ > m_MaxRetries)
{
throw new InvalidOperationException("UlReceiveHttpRequest() Too many retries");
}
result =
ComNetOS.IsWinNt ?
UlSysApi.UlReceiveHttpRequest(
m_AppPoolHandle,
AResult.m_RequestId,
UlConstants.UL_RECEIVE_REQUEST_FLAG_COPY_BODY,
AResult.m_Buffer,
AResult.m_BufferSize,
ref AResult.m_BytesReturned,
AResult.m_Overlapped)
:
UlVxdApi.UlReceiveHttpRequestHeaders(
m_AppPoolHandle,
AResult.m_RequestId,
0,
AResult.m_Buffer,
AResult.m_BufferSize,
ref AResult.m_BytesReturned,
AResult.m_Overlapped);
GlobalLog.Print("UlReceiveHttpRequest() returns:"
+ Convert.ToString(result));
if (result == NativeMethods.ERROR_SUCCESS || result == NativeMethods.ERROR_IO_PENDING)
{
//
// synchronous success or successfull pending: we are done
//
break;
}
if (result == NativeMethods.ERROR_INVALID_PARAMETER)
{
//
// we might get this if somebody stole our RequestId,
// set RequestId to null
//
AResult.m_RequestId = 0;
//
// and start all over again with the buffer we
// just allocated
//
continue;
}
if (result == NativeMethods.ERROR_MORE_DATA)
{
//
// the buffer was not big enough to fit the headers, we need
// to read the RequestId returned, grow the buffer, keeping
// the data already transferred
//
AResult.m_RequestId = Marshal.ReadInt64(IntPtrHelper.Add(AResult.m_Buffer, m_RequestIdOffset));
//
// allocate a new buffer of the required size
//
IntPtr NewBuffer = Marshal.AllocHGlobal(AResult.m_BytesReturned);
//
// copy the data already read from the old buffer into the
// new one
//
NativeMethods.CopyMemory(NewBuffer, AResult.m_Buffer, AResult.m_BufferSize);
//
// free the old buffer
//
Marshal.FreeHGlobal(AResult.m_Buffer);
//
// update buffer pointer and size
//
AResult.m_Buffer = NewBuffer;
AResult.m_BufferSize = AResult.m_BytesReturned;
AResult.m_BytesReturned = 0;
//
// and start all over again with the new buffer
//
continue;
}
//
// someother bad error, possible( ? ) return values are:
//
// ERROR_INVALID_HANDLE
// ERROR_INSUFFICIENT_BUFFER
// ERROR_OPERATION_ABORTED
// ERROR_IO_PENDING
//
throw new InvalidOperationException("UlReceiveHttpRequest() failed, err#" + Convert.ToString(result));
}
//
// we get here only if a break happens, i.e.
// 1) syncronous completion
// 2) the IO pended
//
if (result == NativeMethods.ERROR_SUCCESS)
{
//
// set syncronous completion to true
//
AResult.Complete(true);
//
// and call the internal callback
//
WaitCallback(AResult, false);
}
else
{
//
// create a new delegate
// and spin a new thread from the thread pool to wake up when the
// event is signaled and call the delegate
//
ThreadPool.RegisterWaitForSingleObject(
m_Event,
new WaitOrTimerCallback(WaitCallback),
AResult,
-1,
true);
}
GlobalLog.Print("returning AResult");
return(AResult);
} // StartListen()
GetRequest()
{
//
// Validation
//
if (m_AppPoolHandle == NativeMethods.INVALID_HANDLE_VALUE)
{
throw new InvalidOperationException("The AppPool handle is invalid");
}
int result;
int retries = 0;
//
// defined in ulcommonapi.cs
//
int RcvHeadersBufferSize = UlConstants.InitialBufferSize;
//
// prepare ( allocate/pin ) buffers and data for the first unmanaged call
//
GCHandle PinnedBuffer;
GCHandle NewPinnedBuffer;
IntPtr AddrOfPinnedBuffer = IntPtr.Zero;
IntPtr NewAddrOfPinnedBuffer = IntPtr.Zero;
int BytesReturned = 0;
long RequestId = 0;
byte[] RcvHeadersBuffer = new byte[RcvHeadersBufferSize];
//
// pin buffers and data for the unmanaged call
//
PinnedBuffer = GCHandle.Alloc(RcvHeadersBuffer, GCHandleType.Pinned);
AddrOfPinnedBuffer = PinnedBuffer.AddrOfPinnedObject();
//
// issue unmanaged blocking call until we read enough data:
// usually starting with a InitialBufferSize==4096 bytes we should be
// able to get all the headers ( and part of the entity body, if any
// is present ), if we don't, if the call didn't fail for othe reasons,
// we get indication in BytesReturned, on how big the buffer should be
// to receive the data available, so usually the second call will
// succeed, but we have to consider the case of two competing calls
// for the same RequestId, and that's why we need a loop and not just
// a try/retry-expecting-success fashion
//
for (;;)
{
//
// check if we're in a healthy state
//
if (retries++ > m_MaxRetries)
{
throw new InvalidOperationException("UlReceiveHttpRequest() Too many retries");
}
result =
ComNetOS.IsWinNt ?
UlSysApi.UlReceiveHttpRequest(
m_AppPoolHandle,
RequestId,
UlConstants.UL_RECEIVE_REQUEST_FLAG_COPY_BODY,
AddrOfPinnedBuffer,
RcvHeadersBufferSize,
ref BytesReturned,
IntPtr.Zero)
:
UlVxdApi.UlReceiveHttpRequestHeaders(
m_AppPoolHandle,
RequestId,
0,
AddrOfPinnedBuffer,
RcvHeadersBufferSize,
ref BytesReturned,
IntPtr.Zero);
if (result == NativeMethods.ERROR_SUCCESS)
{
//
// success, we are done.
//
break;
}
if (result == NativeMethods.ERROR_INVALID_PARAMETER)
{
//
// we might get this if somebody stole our RequestId,
// set RequestId to null
//
RequestId = 0;
//
// and start all over again with the buffer we
// just allocated
//
continue;
}
//
// let's check if ul is in good shape:
//
if (BytesReturned < RcvHeadersBufferSize)
{
throw new InvalidOperationException("UlReceiveHttpRequest() sent bogus BytesReturned: " + Convert.ToString(BytesReturned));
}
if (result == NativeMethods.ERROR_MORE_DATA)
{
//
// the buffer was not big enough to fit the headers, we need
// to read the RequestId returned, grow the buffer, keeping
// the data already transferred
//
RequestId = Marshal.ReadInt64(IntPtrHelper.Add(AddrOfPinnedBuffer, m_RequestIdOffset));
//
// CODEWORK: wait for the answer from LarrySu
//
//
// if the buffer size was too small, grow the buffer
// this reallocation dereferences the old buffer, but since
// this was previously pinned, it won't be garbage collected
// until we unpin it ( which we do below )
//
RcvHeadersBuffer = new byte[BytesReturned];
//
// pin the new one
//
NewPinnedBuffer = GCHandle.Alloc(RcvHeadersBuffer, GCHandleType.Pinned);
NewAddrOfPinnedBuffer = NewPinnedBuffer.AddrOfPinnedObject();
//
// copy the valid data
//
Marshal.Copy(AddrOfPinnedBuffer, RcvHeadersBuffer, 0, RcvHeadersBufferSize);
RcvHeadersBufferSize = BytesReturned;
//
// unpin the old buffer, reset pinned/unmanaged pointers
//
PinnedBuffer.Free();
PinnedBuffer = NewPinnedBuffer;
AddrOfPinnedBuffer = NewAddrOfPinnedBuffer;
//
// and start all over again with the new buffer
//
continue;
}
//
// someother bad error, possible( ? ) return values are:
//
// ERROR_INVALID_HANDLE
// ERROR_INSUFFICIENT_BUFFER
// ERROR_OPERATION_ABORTED
// ERROR_IO_PENDING
//
throw new InvalidOperationException("UlReceiveHttpRequest() failed, err#" + Convert.ToString(result));
}
GlobalLog.Print("GetRequest RequestId:" + Convert.ToString(RequestId)); //
// translate unmanaged results into a new managed object
//
HttpListenerWebRequest
myWebRequest =
new HttpListenerWebRequest(AddrOfPinnedBuffer, RcvHeadersBufferSize, m_AppPoolHandle);
//
// free the unmanaged buffer ( deallocate/unpin ) after unmanaged call
//
PinnedBuffer.Free();
return(myWebRequest);
} // GetRequest()
