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windows-xp/Source/XPSP1/NT/admin/services/drizzle/server/isapi/server.cpp

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/*++
Copyright (c) 2001 Microsoft Corporation
Module Name:
server.cpp
Abstract:
This file implements the BITS server extensions
--*/
#include "precomp.h"
#if DBG
#define CLEARASYNCBUFFERS
#endif
#if defined( USE_WININET )
typedef StringHandleA HTTPStackStringHandle;
typedef char HTTP_STRING_TYPE;
#define HTTP_STRING( X ) X
#else
typedef StringHandleW HTTPStackStringHandle;
typedef WCHAR HTTP_STRING_TYPE;
#define HTTP_STRING( X ) L ## X
#endif
const DWORD SERVER_REQUEST_SPINLOCK = 0x80000040;
const DWORD ASYNC_READER_SPINLOCK = 0x80000040;
const char * const UPLOAD_PROTOCOL_STRING_V1 = "{7df0354d-249b-430f-820d-3d2a9bef4931}";
// packet types that are sent in the protocol
const char * const PACKET_TYPE_CREATE_SESSION = "Create-Session";
const char * const PACKET_TYPE_FRAGMENT = "Fragment";
const char * const PACKET_TYPE_CLOSE_SESSION = "Close-Session";
const char * const PACKET_TYPE_CANCEL_SESSION = "Cancel-Session";
const char * const PACKET_TYPE_PING = "Ping";
//
// IISLogger
//
// Manages the circular debugging log.
//
class IISLogger
{
EXTENSION_CONTROL_BLOCK *m_ExtensionControlBlock;
void LogString( const char *String, int Size );
public:
IISLogger( EXTENSION_CONTROL_BLOCK *ExtensionControlBlock ) :
m_ExtensionControlBlock( ExtensionControlBlock )
{
}
void LogError( ServerException Error );
void LogError( const GUID & SessionID, ServerException Error );
void LogNewSession( const GUID & SessionID );
void LogUploadComplete( const GUID & SessionID, UINT64 FileSize );
void LogSessionClose( const GUID & SessionID );
void LogSessionCancel( const GUID & SessionID );
void LogExecuteEnabled();
};
class CriticalSectionLock
{
CRITICAL_SECTION* m_cs;
public:
CriticalSectionLock( CRITICAL_SECTION *cs ) :
m_cs( cs )
{
EnterCriticalSection( m_cs );
}
~CriticalSectionLock()
{
LeaveCriticalSection( m_cs );
}
};
class AsyncReader;
//
// ServerRequest
//
// Contains all data needed to service a request. A request is a single POST not a single
// upload.
class ServerRequest : IISLogger
{
public:
ServerRequest( EXTENSION_CONTROL_BLOCK * ExtensionControlBlock );
~ServerRequest();
long AddRef();
long Release();
bool IsPending() { return m_IsPending; }
// The do it function!
void DispatchRequest();
friend AsyncReader;
private:
long m_refs;
CRITICAL_SECTION m_cs;
bool m_IsPending;
EXTENSION_CONTROL_BLOCK *m_ExtensionControlBlock;
AsyncReader *m_AsyncReader;
// Filled in by dispatch Request
StringHandle m_PacketType;
// Variables filled in by CrackPhysicalPath
StringHandle m_PhysicalPath; // Path part of PathTranslated
StringHandle m_PhysicalFile; // File part of PathTranslated
StringHandle m_PhysicalPathAndFile; // All of PathTranslated
StringHandle m_ConnectionsDirectory; // Path of the BITS connections directory
StringHandle m_ConnectionDirectory; // Path of the connection directory for this connection
StringHandle m_CacheFileDirectoryAndFile; // Full file path of cache file
StringHandle m_ResponseFileDirectoryAndFile; // Full file path of response file
// Filled in by OpenCacheFile
HANDLE m_CacheFile;
GUID m_SessionId;
StringHandle m_SessionIdString;
VDirConfig *m_DirectoryConfig;
void GetConfig();
StringHandle GetServerVariable( char *ServerVariable );
bool TestServerVariable( char *ServerVariable );
StringHandle GetRequestURL();
void ValidateProtocol();
void CrackSessionId();
void CrackPhysicalPath();
void OpenCacheFile();
void ReopenCacheFileAsSync();
void CloseCacheFile();
void CrackContentRange(
UINT64 & RangeStart,
UINT64 & RangeLength,
UINT64 & TotalLength );
void ScheduleAsyncOperation(
DWORD OperationID,
LPVOID Buffer,
LPDWORD Size,
LPDWORD DataType );
void CloseCancelSession();
// dispatch routines
void CreateSession();
void AddFragment();
void CloseSession();
void CancelSession();
void Ping();
// Response handling
void SendResponse( char *Format, DWORD Code = 200, ... );
void SendResponse( ServerException Exception );
void FinishSendingResponse();
void DrainFragmentBlockComplete( DWORD cbIO, DWORD dwError );
static void DrainFragmentBlockCompleteWrapper(
LPEXTENSION_CONTROL_BLOCK lpECB,
PVOID pContext,
DWORD cbIO,
DWORD dwError);
void StartDrainBlock( );
void DrainData();
StringHandle m_ResponseString;
DWORD m_ResponseCode;
HRESULT m_ResponseHRESULT;
UINT64 m_BytesToDrain;
UINT64 m_ContentLength;
// async IO handling
void CompleteIO( AsyncReader *Reader, UINT64 TotalBytesRead );
void HandleIOError( AsyncReader *Reader, ServerException Error, UINT64 TotalBytesRead );
// backend notification
char m_NotifyBuffer[ 1024 ];
void CallServerNotification( UINT64 CacheFileSize );
bool TestResponseHeader( HINTERNET hRequest, const HTTP_STRING_TYPE *Header );
StringHandle GetResponseHeader( HINTERNET hRequest, const HTTP_STRING_TYPE *Header );
// deal with chaining
static void ForwardComplete(
LPEXTENSION_CONTROL_BLOCK lpECB, PVOID pContext,
DWORD cbIO, DWORD dwError );
void ForwardToNextISAPI();
};
// AsyncReader
//
// Manages the buffering needed to handle the async read/write operations.
class AsyncReader : private OVERLAPPED
{
public:
AsyncReader( ServerRequest *Request,
UINT64 BytesToDrain,
UINT64 BytesToWrite,
UINT64 WriteOffset,
bool IsLastBlock,
HANDLE WriteHandle,
char *PrereadBuffer,
DWORD PrereadSize );
~AsyncReader();
UINT64 GetWriteOffset()
{
return m_WriteOffset;
}
bool IsLastBlock()
{
return m_IsLastBlock;
}
private:
ServerRequest *m_Request;
UINT64 m_BytesToDrain;
UINT64 m_WriteOffset;
UINT64 m_ReadOffset;
UINT64 m_BytesToWrite;
UINT64 m_BytesToRead;
bool m_IsLastBlock;
char * m_PrereadBuffer;
DWORD m_PrereadSize;
UINT64 m_TotalBytesRead;
HANDLE m_WriteHandle;
HANDLE m_ThreadToken;
char m_OperationsPending;
DWORD m_ReadBuffer;
DWORD m_WriteBuffer;
DWORD m_BuffersToWrite;
bool m_WritePending;
bool m_ReadPending;
bool m_ErrorValid;
ServerException m_Error;
const static NUMBER_OF_IO_BUFFERS = 3;
struct IOBuffer
{
UINT64 m_BufferWriteOffset;
DWORD m_BufferUsed;
char m_Buffer[ 32768 ];
} m_IOBuffers[ NUMBER_OF_IO_BUFFERS ];
void HandleError( ServerException Error );
void CompleteIO();
void StartReadRequest();
void StartWriteRequest();
void StartupIO( );
void WriteComplete( DWORD dwError, DWORD BytesWritten );
void ReadComplete( DWORD dwError, DWORD BytesRead );
static DWORD StartupIOWraper( LPVOID Context );
static void CALLBACK WriteCompleteWraper( DWORD dwErrorCode, DWORD dwNumberOfBytesTransfered, LPOVERLAPPED lpOverlapped );
static void WINAPI ReadCompleteWraper( LPEXTENSION_CONTROL_BLOCK, PVOID pContext, DWORD cbIO, DWORD dwError );
};
ServerRequest::ServerRequest(
EXTENSION_CONTROL_BLOCK * ExtensionControlBlock
) :
IISLogger( ExtensionControlBlock ),
m_refs(1),
m_IsPending( false ),
m_ExtensionControlBlock( ExtensionControlBlock ),
m_AsyncReader( NULL ),
m_CacheFile( INVALID_HANDLE_VALUE ),
m_DirectoryConfig( NULL ),
m_ResponseCode( 0 ),
m_ResponseHRESULT( 0 ),
m_BytesToDrain( 0 ),
m_ContentLength( 0 )
{
memset( &m_SessionId, 0, sizeof(m_SessionId) );
if ( !InitializeCriticalSectionAndSpinCount( &m_cs, SERVER_REQUEST_SPINLOCK ) )
throw ServerException( HRESULT_FROM_WIN32( GetLastError() ) );
}
ServerRequest::~ServerRequest()
{
// The destructor handles most of the cleanup.
Log( LOG_CALLEND, "Connection: %p, Packet-Type: %s, Method: %s, Path %s, HTTPError: %u, HRESULT: 0x%8.8X",
m_ExtensionControlBlock->ConnID,
(const char*)m_PacketType,
m_ExtensionControlBlock->lpszMethod,
static_cast<const char*>( m_PhysicalPathAndFile ),
m_ResponseCode,
m_ResponseHRESULT );
delete m_AsyncReader;
CloseCacheFile();
if ( m_DirectoryConfig )
m_DirectoryConfig->Release();
DeleteCriticalSection( &m_cs );
if ( m_IsPending )
{
Log( LOG_INFO, "Ending session" );
(*m_ExtensionControlBlock->ServerSupportFunction)
( m_ExtensionControlBlock->ConnID,
HSE_REQ_DONE_WITH_SESSION,
NULL,
NULL,
NULL );
}
}
long
ServerRequest::AddRef()
{
long Result = InterlockedIncrement( &m_refs );
ASSERT( Result > 0 );
return Result;
}
long
ServerRequest::Release()
{
long Result = InterlockedDecrement( &m_refs );
ASSERT( Result >= 0 );
if ( !Result )
delete this;
return Result;
}
StringHandle
ServerRequest::GetServerVariable(
char * ServerVariable )
{
//
// Retrive a server variable from IIS. Throws an exception
// is the variable can not be retrieved.
//
DWORD SizeOfBuffer = 0;
BOOL Result = (*m_ExtensionControlBlock->GetServerVariable)
( m_ExtensionControlBlock->ConnID,
ServerVariable,
NULL,
&SizeOfBuffer );
if ( Result )
return StringHandle();
if ( GetLastError() != ERROR_INSUFFICIENT_BUFFER )
{
Log( LOG_ERROR, "Unable to lookup server variable %s, error %x",
ServerVariable,
HRESULT_FROM_WIN32( GetLastError() ) );
throw ServerException( HRESULT_FROM_WIN32(GetLastError()) );
}
StringHandle WorkString;
char *Buffer = WorkString.AllocBuffer( SizeOfBuffer );
Result = (*m_ExtensionControlBlock->GetServerVariable)
( m_ExtensionControlBlock->ConnID,
ServerVariable,
Buffer,
&SizeOfBuffer );
if ( !Result )
{
Log( LOG_ERROR, "Unable to lookup server variable %s, error %x",
ServerVariable,
HRESULT_FROM_WIN32( GetLastError() ) );
throw ServerException( HRESULT_FROM_WIN32( GetLastError() ) );
}
WorkString.SetStringSize();
return WorkString;
}
bool
ServerRequest::TestServerVariable(
char *ServerVariable )
{
// Test for the existence of a server variable.
// Returns true if the variable exists, and false if it doesn't.
// throw an exception on an error.
DWORD SizeOfBuffer = 0;
BOOL Result = (*m_ExtensionControlBlock->GetServerVariable)
( m_ExtensionControlBlock->ConnID,
ServerVariable,
NULL,
&SizeOfBuffer );
if ( Result )
return true;
DWORD dwError = GetLastError();
if ( ERROR_INVALID_INDEX == dwError ||
ERROR_NO_DATA == dwError )
return false;
if ( ERROR_INSUFFICIENT_BUFFER == dwError )
return true;
Log( LOG_ERROR, "Unable to test server variable %s, error %x",
ServerVariable,
HRESULT_FROM_WIN32( GetLastError() ) );
throw ServerException( HRESULT_FROM_WIN32( dwError ) );
}
StringHandle
ServerRequest::GetRequestURL()
{
// Recreate the request URL from the information available from IIS.
// This may not always be possible, but do the best that we can do.
StringHandle ServerName = GetServerVariable("SERVER_NAME");
StringHandle ServerPort = GetServerVariable("SERVER_PORT");
StringHandle URL = GetServerVariable("URL");
StringHandle HTTPS = GetServerVariable("HTTPS");
StringHandle QueryString = GetServerVariable("QUERY_STRING");
StringHandle RequestURL;
if ( _stricmp( HTTPS, "on" ) == 0 )
RequestURL = "https://";
else
RequestURL = "http://";
RequestURL += ServerName;
RequestURL += ":";
RequestURL += ServerPort;
RequestURL += URL;
if ( QueryString.Size() > 0 )
{
RequestURL += "?";
RequestURL += QueryString;
}
return BITSUrlCanonicalize( RequestURL, URL_ESCAPE_UNSAFE );
}
void
ServerRequest::FinishSendingResponse()
{
// Completes the response. The response is taken from the buffer and
// sent to the client via IIS. The choice to cancel or keep-alive the
// connection made by IIS.
Log( LOG_INFO, "Finish sending response" );
// Close the cache before sending the response in case the client starts a new request immediatly.
CloseCacheFile();
// Finish sending the response using the information
// in m_ResponseBuffer and m_ResponseCode.
// If an error occures, give up and force a disconnect.
m_ExtensionControlBlock->dwHttpStatusCode = m_ResponseCode;
BOOL Result;
BOOL KeepConnection;
Result =
(m_ExtensionControlBlock->ServerSupportFunction)(
m_ExtensionControlBlock->ConnID,
HSE_REQ_IS_KEEP_CONN,
&KeepConnection,
NULL,
NULL );
if ( !Result )
{
// Error occured quering the disconnect setting. Assume
// a disconnect.
KeepConnection = 0;
}
// IIS5.0(Win2k) has a bug where KeepConnect is returned as -1
// to keep the connection alive. Apparently, this confuses the
// HSE_REQ_SEND_RESPONSE_HEADER_EX call. Bash the value into a real bool.
KeepConnection = KeepConnection ? 1 : 0;
HSE_SEND_HEADER_EX_INFO HeaderInfo;
HeaderInfo.pszStatus = LookupHTTPStatusCodeText( m_ResponseCode );
HeaderInfo.cchStatus = strlen( HeaderInfo.pszStatus );
HeaderInfo.pszHeader = (const char*)m_ResponseString;
HeaderInfo.cchHeader = (DWORD)m_ResponseString.Size();
HeaderInfo.fKeepConn = KeepConnection;
Result =
(m_ExtensionControlBlock->ServerSupportFunction)(
m_ExtensionControlBlock->ConnID,
HSE_REQ_SEND_RESPONSE_HEADER_EX,
&HeaderInfo,
NULL,
NULL );
if ( !Result )
{
Log( LOG_ERROR, "Unable to send response, error %x",
HRESULT_FROM_WIN32( GetLastError() ) );
Log( LOG_INFO, "Forcing the connection closed" );
// Couldn't send the response, attempt to close the connection
Result =
(m_ExtensionControlBlock->ServerSupportFunction)(
m_ExtensionControlBlock->ConnID,
HSE_REQ_CLOSE_CONNECTION,
NULL,
NULL,
NULL );
if ( !Result )
{
// The close connection request failed. No choice but to invoke
// the hammer of death
(m_ExtensionControlBlock->ServerSupportFunction)(
m_ExtensionControlBlock->ConnID,
HSE_REQ_ABORTIVE_CLOSE,
NULL,
NULL,
NULL );
}
}
}
void
ServerRequest::SendResponse( char *Format, DWORD Code, ...)
{
// Starts the sending of a response. Unfortunatly, many HTTP
// client stacks do not handle a response being returned while
// data is still being sent. To handle this, it is necessary
// to capture the response to a buffer. Then after all the sent data
// is drained, finally send the response.
va_list arglist;
va_start( arglist, Code );
SIZE_T ResponseBufferSize = 512;
while( 1 )
{
char * ResponseBuffer = m_ResponseString.AllocBuffer( ResponseBufferSize );
HRESULT Hr =
StringCchVPrintfA(
ResponseBuffer,
ResponseBufferSize,
Format,
arglist );
if ( SUCCEEDED( Hr ) )
{
m_ResponseString.SetStringSize();
break;
}
else if ( STRSAFE_E_INSUFFICIENT_BUFFER == Hr )
ResponseBufferSize *= 2;
else
throw ServerException( Hr );
if ( ResponseBufferSize >= 0xFFFFFFFF )
throw ServerException( E_INVALIDARG );
}
m_ResponseCode = Code;
// Drain data in error cases, othersize assume that
// we already drained all the data.
if ( Code >= 400 )
{
// This is an error case. Drain the data first, then send
// the response.
Log( LOG_INFO, "HTTP status >= 400, draining data" );
try
{
// start draining data. DrainData() calls FinishSendingResponse
// when it is finished.
DrainData();
}
catch( ServerException Exception )
{
// something is very broken, and an attempt to drain excess data
// failed. Nothing else to do except try sending the response.
FinishSendingResponse();
}
return;
}
else
{
// Just send the response since we already handled draining
FinishSendingResponse();
}
}
void
ServerRequest::SendResponse( ServerException Exception )
{
// Starts the sending of a response. Unfortunatly, many HTTP
// client stacks do not handle a response being returned while
// data is still being sent. To handle this, it is necessary
// to capture the response to a buffer. Then after all the sent data
// is drained, finally send the response.
GUID NullGuid;
memset( &NullGuid, 0, sizeof( NullGuid ) );
if ( memcmp( &NullGuid, &m_SessionId, sizeof( NullGuid ) ) == 0 )
LogError( Exception );
else
LogError( m_SessionId, Exception );
SIZE_T ResponseBufferSize = 512;
while( 1 )
{
char * ResponseBuffer = m_ResponseString.AllocBuffer( ResponseBufferSize );
HRESULT Hr =
StringCchPrintfA(
ResponseBuffer,
ResponseBufferSize,
"Pragma: no-cache\r\n"
"BITS-packet-type: Ack\r\n"
"BITS-Error: 0x%8.8X\r\n"
"BITS-Error-Context: 0x%X\r\n"
"\r\n",
Exception.GetCode(),
Exception.GetContext() );
if ( SUCCEEDED( Hr ) )
{
m_ResponseString.SetStringSize();
break;
}
else if ( STRSAFE_E_INSUFFICIENT_BUFFER == Hr )
ResponseBufferSize *= 2;
else
throw ServerException( Hr );
if ( ResponseBufferSize >= 0xFFFFFFFF )
throw ServerException( E_INVALIDARG );
}
m_ResponseCode = Exception.GetHttpCode();
m_ResponseHRESULT = Exception.GetCode();
Log( LOG_INFO, "Sending error response of HRESULT: 0x%8.8X, HTTP status: %d",
m_ResponseHRESULT, m_ResponseCode );
try
{
DrainData();
}
catch( ServerException Exception )
{
FinishSendingResponse();
}
}
void
ServerRequest::DrainFragmentBlockComplete(
DWORD cbIO,
DWORD dwError )
{
// A drain block has been completed. If this is the last block, finish sending the response.
// Otherwise,
Log( LOG_INFO, "Drain fragment complete, cbIO: %u, dwError: %u", cbIO, dwError );
m_BytesToDrain -= cbIO;
if ( !m_BytesToDrain || !cbIO || dwError )
{
FinishSendingResponse();
return;
}
try
{
StartDrainBlock();
}
catch( ServerException Exception )
{
// An error occured while draining data, exit
FinishSendingResponse();
}
}
void
ServerRequest::DrainFragmentBlockCompleteWrapper(
LPEXTENSION_CONTROL_BLOCK lpECB,
PVOID pContext,
DWORD cbIO,
DWORD dwError)
{
// Wrapper, handles critical section
ServerRequest *This = (ServerRequest*)pContext;
{
CriticalSectionLock CSLock( &This->m_cs );
This->DrainFragmentBlockComplete( cbIO, dwError );
}
This->Release();
}
void
ServerRequest::StartDrainBlock( )
{
// start the next block to drain.
BOOL Result;
static char s_Buffer[ 32768 ];
DWORD ReadSize = (DWORD)min( 0xFFFFFFFF, min( m_BytesToDrain, sizeof( s_Buffer ) ) );
DWORD Flags = HSE_IO_ASYNC;
Log( LOG_INFO, "Starting next drain block of %u bytes", ReadSize );
ScheduleAsyncOperation(
HSE_REQ_ASYNC_READ_CLIENT,
(LPVOID)s_Buffer,
&ReadSize,
&Flags );
}
void
ServerRequest::DrainData()
{
// Make the decission regarding the amount of data to drain
// and the start the first block
if ( m_DirectoryConfig )
m_BytesToDrain = min( m_BytesToDrain, m_DirectoryConfig->m_MaxFileSize );
else
// use an internal max of 4KB
m_BytesToDrain = min( 4096, m_BytesToDrain );
if ( !m_BytesToDrain )
{
Log( LOG_INFO, "No bytes to drain, finish it" );
FinishSendingResponse();
return;
}
Log( LOG_INFO, "Starting pipe drain" );
BOOL Result;
Result =
(*m_ExtensionControlBlock->ServerSupportFunction)(
m_ExtensionControlBlock->ConnID,
HSE_REQ_IO_COMPLETION,
(LPVOID)DrainFragmentBlockCompleteWrapper,
0,
(LPDWORD)this );
if ( !Result )
{
Log( LOG_ERROR, "Error settings callback, error %x",
HRESULT_FROM_WIN32( GetLastError() ) );
throw ServerException( HRESULT_FROM_WIN32( GetLastError() ) );
}
StartDrainBlock();
}
void
ServerRequest::ValidateProtocol()
{
// Negotiate the protocol with the client. The client sends a list of
// supported protocols to the server and the server picks the best protocol.
// For now, only one protocol is supported.
StringHandle SupportedProtocolsHandle = GetServerVariable( "HTTP_BITS-SUPPORTED-PROTOCOLS" );
WorkStringBuffer SupportedProtocolsBuffer( (const char*) SupportedProtocolsHandle );
char *SupportedProtocols = SupportedProtocolsBuffer.GetBuffer();
char *Protocol = strtok( SupportedProtocols, " ," );
while( Protocol )
{
if ( _stricmp( Protocol, UPLOAD_PROTOCOL_STRING_V1 ) == 0 )
{
Log( LOG_INFO, "Detected protocol upload protocol V1" );
return;
}
Protocol = strtok( NULL, " ," );
}
Log( LOG_INFO, "Unsupported protocols, %s", (const char*)SupportedProtocols );
throw ServerException( E_INVALIDARG );
}
void
ServerRequest::CrackSessionId()
{
// Convert the session ID from a string into a GUID.
StringHandle SessionId = GetServerVariable( "HTTP_BITS-Session-Id" );
m_SessionId = BITSGuidFromString( SessionId );
m_SessionIdString = BITSStringFromGuid( m_SessionId );
}
void
ServerRequest::CrackContentRange(
UINT64 & RangeStart,
UINT64 & RangeLength,
UINT64 & TotalLength )
{
// Crack the content range header which contains the client's view of where the
// upload is at.
StringHandle ContentRange = GetServerVariable( "HTTP_Content-Range" );
UINT64 RangeEnd;
int ReturnVal = sscanf( ContentRange, " bytes %I64u - %I64u / %I64u ",
&RangeStart, &RangeEnd, &TotalLength );
if ( TotalLength > m_DirectoryConfig->m_MaxFileSize )
{
Log( LOG_ERROR, "Size of the upload at %I64u is greater then the maximum of %I64u",
TotalLength, m_DirectoryConfig->m_MaxFileSize );
throw ServerException( BG_E_TOO_LARGE );
}
if ( ReturnVal != 3 )
{
Log( LOG_ERROR, "Range has %d elements instead of the expected number of 3", ReturnVal );
throw ServerException( E_INVALIDARG );
}
if ( ( RangeStart == RangeEnd + 1 ) &&
( 0 == m_ContentLength ) &&
( RangeStart == TotalLength ) )
{
// Continue after a failed notification
RangeStart = TotalLength;
RangeLength = 0;
return;
}
if ( RangeEnd < RangeStart )
{
Log( LOG_ERROR, "Range start is greater then the range length, End %I64u, Start %I64u",
RangeEnd, RangeStart );
throw ServerException( E_INVALIDARG );
}
RangeLength = RangeEnd - RangeStart + 1;
if ( m_ContentLength != RangeLength )
{
Log( LOG_ERROR, "The content length is different from the range length. Content %I64u, Range %I64u",
m_ContentLength, RangeLength );
throw ServerException( E_INVALIDARG );
}
}
void
ServerRequest::ScheduleAsyncOperation(
DWORD OperationID,
LPVOID Buffer,
LPDWORD Size,
LPDWORD DataType )
{
// start an async operation and handle all the flags and recounting required.
BOOL Result;
AddRef();
Result =
(*m_ExtensionControlBlock->ServerSupportFunction)(
m_ExtensionControlBlock->ConnID,
OperationID,
Buffer,
Size,
DataType );
if ( !Result )
{
HRESULT Hr = HRESULT_FROM_WIN32( GetLastError() );
Log( LOG_ERROR, "Error starting async operation, error %x", Hr );
// Operation was never scheduled, remove the callbacks refcount
Release();
throw ServerException( Hr );
}
m_IsPending = true;
}
// dispatch routines
void
ServerRequest::CreateSession()
{
// Handles the Create-Session command from the client.
// Create a new session and all the directories required to
// support that session.
ValidateProtocol();
m_SessionId = BITSCreateGuid();
m_SessionIdString = BITSStringFromGuid( m_SessionId );
CrackPhysicalPath();
BITSCreateDirectory( (LPCTSTR)m_ConnectionsDirectory );
try
{
// Need to create directories in a loop since another thread could
// delete the connections directory just as we are creating the connection
// directory.
while( 1 )
{
try
{
BITSCreateDirectory( m_ConnectionDirectory );
break;
}
catch( ServerException e )
{
if ( e.GetCode() != HRESULT_FROM_WIN32( ERROR_PATH_NOT_FOUND ) )
throw;
// Try to recreate the connections directory
BITSCreateDirectory( (LPCTSTR)m_ConnectionsDirectory );
}
}
OpenCacheFile( );
}
catch( ServerException e )
{
RemoveDirectory( m_ConnectionDirectory );
RemoveDirectory( m_ConnectionsDirectory );
throw;
}
if ( m_DirectoryConfig->m_HostId.Size() )
{
if ( m_DirectoryConfig->m_HostIdFallbackTimeout != MD_BITS_NO_TIMEOUT )
{
SendResponse(
"Pragma: no-cache\r\n"
"BITS-Packet-Type: Ack\r\n"
"BITS-Protocol: %s\r\n"
"BITS-Session-Id: %s\r\n"
"BITS-Host-Id: %s\r\n"
"BITS-Host-Id-Fallback-Timeout: %u\r\n"
"Content-Length: 0\r\n"
"Accept-encoding: identity\r\n"
"\r\n",
200,
UPLOAD_PROTOCOL_STRING_V1,
(const char*)m_SessionIdString, // SessionId
(const char*)m_DirectoryConfig->m_HostId,
m_DirectoryConfig->m_HostIdFallbackTimeout
);
}
else
{
SendResponse(
"Pragma: no-cache\r\n"
"BITS-Packet-Type: Ack\r\n"
"BITS-Protocol: %s\r\n"
"BITS-Session-Id: %s\r\n"
"BITS-Host-Id: %s\r\n"
"Content-Length: 0\r\n"
"Accept-encoding: identity\r\n"
"\r\n",
200,
UPLOAD_PROTOCOL_STRING_V1,
(const char*)m_SessionIdString, // SessionId
(const char*)m_DirectoryConfig->m_HostId
);
}
}
else
{
SendResponse(
"Pragma: no-cache\r\n"
"BITS-Packet-Type: Ack\r\n"
"BITS-Protocol: %s\r\n"
"BITS-Session-Id: %s\r\n"
"Content-Length: 0\r\n"
"Accept-encoding: identity\r\n"
"\r\n",
200,
UPLOAD_PROTOCOL_STRING_V1,
(const char*)m_SessionIdString // SessionId
);
}
LogNewSession( m_SessionId );
}
void
ServerRequest::AddFragment()
{
// Handles the fragment command from the client. Opens the cache file
// and resumes the upload.
CrackSessionId();
CrackPhysicalPath();
OpenCacheFile( );
UINT64 CacheFileSize = BITSGetFileSize( m_CacheFile );
UINT64 RangeStart, RangeLength, TotalLength;
CrackContentRange( RangeStart, RangeLength, TotalLength );
if ( CacheFileSize < RangeStart )
{
// Can't recover from this error on the server since we have a gap.
// Need to get the client to backup and start again.
Log( LOG_INFO, "Client and server are hopelessly out of sync, sending the 416 error code" );
SendResponse(
"Pragma: no-cache\r\n"
"BITS-Packet-Type: Ack\r\n"
"BITS-Received-Content-Range: %I64u\r\n"
"\r\n",
416,
CacheFileSize );
return;
}
if ( RangeStart + RangeLength > TotalLength )
{
Log( LOG_ERROR, "Range extends past end of file. Start %I64u, Length %I64u, Total %I64u",
RangeStart, RangeLength, TotalLength );
throw ServerException( E_INVALIDARG );
}
BITSSetFilePointer( m_CacheFile, 0, FILE_END );
// Some thought cases for these formulas.
// 1. RangeLength = 0
// BytesToDrain will be 0 and BytesToWrite will be 0
// 2. RangeStart = CacheFileSize ( most common case )
// BytesToDrain will be 0, and BytesToWrite will be BytesToDrain
// 3. RangeStart < CacheFileSize
// BytesToDrain will be nonzero, and BytesToWrite will be the remainder.
UINT64 BytesToDrain = min( (CacheFileSize - RangeStart), RangeLength );
UINT64 BytesToWrite = RangeLength - BytesToDrain;
UINT64 WriteOffset = CacheFileSize;
// Start the async reader
m_AsyncReader =
new AsyncReader(
this,
BytesToDrain,
BytesToWrite, // bytes to write
WriteOffset, // write offset
RangeStart + RangeLength == TotalLength, // if last BLOCK
m_CacheFile,
(char*)m_ExtensionControlBlock->lpbData,
m_ExtensionControlBlock->cbAvailable );
}
// async IO handling
void
ServerRequest::CompleteIO( AsyncReader *Reader, UINT64 TotalBytesRead )
{
//
// Called by the AsyncReader when the request finished successfully.
//
Log( LOG_INFO, "Async IO operation complete, finishing" );
try
{
if ( TotalBytesRead > m_BytesToDrain )
m_BytesToDrain = 0; // shouldn't happen, but just in case
else
m_BytesToDrain -= TotalBytesRead;
UINT64 CacheFileSize = BITSGetFileSize( m_CacheFile );
ASSERT( Reader->GetWriteOffset() == CacheFileSize );
if ( Reader->IsLastBlock() &&
BITS_NOTIFICATION_TYPE_NONE != m_DirectoryConfig->m_NotificationType )
{
CallServerNotification( CacheFileSize );
}
else
{
// No server notification to make
SendResponse(
"Pragma: no-cache\r\n"
"BITS-Packet-Type: Ack\r\n"
"Content-Length: 0\r\n"
"BITS-Received-Content-Range: %I64u\r\n"
"\r\n",
200,
CacheFileSize );
}
if ( Reader->IsLastBlock() && TotalBytesRead )
LogUploadComplete( m_SessionId, CacheFileSize );
}
catch( ServerException Error )
{
SendResponse( Error );
}
}
void
ServerRequest::HandleIOError( AsyncReader *Reader, ServerException Error, UINT64 TotalBytesRead )
{
//
// Called by AsyncReader when a fatal error occures in processing the request
//
Log( LOG_ERROR, "An error occured while handling the async IO" );
if ( TotalBytesRead > m_BytesToDrain )
m_BytesToDrain = 0; // shouldn't happen, but just in case
else
m_BytesToDrain -= TotalBytesRead;
SendResponse( Error );
}
void
ServerRequest::CallServerNotification( UINT64 CacheFileSize )
{
// Handles notifications and all the exciting pieces to it.
HINTERNET hInternet = NULL;
HINTERNET hConnect = NULL;
HINTERNET hRequest = NULL;
HANDLE hResponseFile = INVALID_HANDLE_VALUE;
Log( LOG_INFO, "Calling backend notification, type %u",
m_DirectoryConfig->m_NotificationType );
try
{
if ( BITS_NOTIFICATION_TYPE_POST_BYVAL == m_DirectoryConfig->m_NotificationType )
{
// only create the response file if this is a byval notification
hResponseFile =
CreateFile(
m_ResponseFileDirectoryAndFile,
GENERIC_READ | GENERIC_WRITE,
0,
NULL,
CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL,
NULL );
if ( INVALID_HANDLE_VALUE == hResponseFile )
{
Log( LOG_ERROR, "Unable to create the response file %s, error %x",
(const char*)m_ResponseFileDirectoryAndFile,
HRESULT_FROM_WIN32( GetLastError() ) );
throw ServerException( HRESULT_FROM_WIN32( GetLastError() ) );
}
}
Log( LOG_INFO, "Connecting to backend for notification" );
#if defined(USE_WININET)
//
// Flush cached credentials
//
if (!InternetSetOption(0, INTERNET_OPTION_END_BROWSER_SESSION, NULL, 0 ))
throw ServerException( HRESULT_FROM_WIN32( GetLastError() ) );
#endif
hInternet =
InternetOpen(
HTTP_STRING( "BITS Server Extensions" ),
INTERNET_OPEN_TYPE_PRECONFIG,
NULL,
NULL,
0 );
if ( !hInternet )
{
Log( LOG_ERROR, "Internet open failed, error %x", HRESULT_FROM_WIN32( GetLastError() ) );
throw ServerException( HRESULT_FROM_WIN32( GetLastError() ), 0, 0x7 );
}
StringHandle RequestURL = GetRequestURL();
StringHandleW NotificationURL;
if ( m_DirectoryConfig->m_NotificationURL.Size() != 0 )
{
// if the a notification URL was set, then combine that URL with the original URL.
// Otherwise just use the original URL. This allows BITS to be used to call
// many arbitrary ASP pages.
NotificationURL = StringHandleW(
BITSUrlCombine( RequestURL, m_DirectoryConfig->m_NotificationURL,
URL_ESCAPE_UNSAFE ) );
}
else
{
NotificationURL = StringHandleW( RequestURL );
}
Log( LOG_INFO, "Request URL: %s", (const char*)StringHandle( RequestURL ) );
Log( LOG_INFO, "Notification URL: %s", (const char*)StringHandle( NotificationURL ) );
//
// Split the URL into server, path, name, and password components.
//
HTTPStackStringHandle HostName;
HTTPStackStringHandle UrlPath;
HTTPStackStringHandle UserName;
HTTPStackStringHandle Password;
URL_COMPONENTS UrlComponents;
ZeroMemory(&UrlComponents, sizeof(UrlComponents));
UrlComponents.dwStructSize = sizeof(UrlComponents);
UrlComponents.lpszHostName = HostName.AllocBuffer( INTERNET_MAX_URL_LENGTH + 1 );
UrlComponents.dwHostNameLength = INTERNET_MAX_URL_LENGTH + 1;
UrlComponents.lpszUrlPath = UrlPath.AllocBuffer( INTERNET_MAX_URL_LENGTH + 1 );
UrlComponents.dwUrlPathLength = INTERNET_MAX_URL_LENGTH + 1;
UrlComponents.lpszUserName = UserName.AllocBuffer( INTERNET_MAX_URL_LENGTH + 1 );
UrlComponents.dwUserNameLength = INTERNET_MAX_URL_LENGTH + 1;
UrlComponents.lpszPassword = Password.AllocBuffer( INTERNET_MAX_URL_LENGTH + 1 );
UrlComponents.dwPasswordLength = INTERNET_MAX_URL_LENGTH + 1;
if ( !InternetCrackUrl(
NotificationURL,
(DWORD)NotificationURL.Size(),
0,
&UrlComponents ) )
{
Log( LOG_ERROR, "InternetCrackURL failed, error %x", HRESULT_FROM_WIN32( GetLastError() ) );
throw ServerException( HRESULT_FROM_WIN32( GetLastError() ), 0, 0x7 );
}
HostName.SetStringSize();
UrlPath.SetStringSize();
UserName.SetStringSize();
Password.SetStringSize();
StringHandle QueryString = GetServerVariable( "QUERY_STRING" );
if ( QueryString.Size() )
{
UrlPath += HTTPStackStringHandle( StringHandle("?") );
UrlPath += HTTPStackStringHandle( QueryString );
}
if ( BITS_NOTIFICATION_TYPE_POST_BYREF == m_DirectoryConfig->m_NotificationType )
CloseCacheFile();
hConnect =
InternetConnect(
hInternet,
HostName,
UrlComponents.nPort,
UserName,
Password,
INTERNET_SERVICE_HTTP,
0, 0 );
if ( !hConnect )
{
Log( LOG_ERROR, "InternetConnect failed, error %x", HRESULT_FROM_WIN32( GetLastError() ) );
throw ServerException( HRESULT_FROM_WIN32( GetLastError() ), 0, 0x7 );
}
const HTTP_STRING_TYPE *AcceptTypes[] = { HTTP_STRING( "*/*" ), NULL };
hRequest =
HttpOpenRequest(
hConnect,
HTTP_STRING( "POST" ),
UrlPath,
HTTP_STRING( "HTTP/1.1" ),
NULL,
AcceptTypes,
#if defined( USE_WININET )
INTERNET_FLAG_NO_UI | INTERNET_FLAG_RELOAD,
#else
INTERNET_FLAG_NO_UI | INTERNET_FLAG_RELOAD | WINHTTP_FLAG_ESCAPE_DISABLE_QUERY,
#endif
0 );
if ( !hRequest )
{
Log( LOG_ERROR, "HttpOpenRequest failed, error %x", HRESULT_FROM_WIN32( GetLastError() ) );
throw ServerException( HRESULT_FROM_WIN32( GetLastError() ), 0, 0x7 );
}
INTERNET_BUFFERS buf = {0};
buf.dwStructSize = sizeof( INTERNET_BUFFERS );
buf.dwBufferTotal = (DWORD)CacheFileSize;
HTTPStackStringHandle AdditionalHeaders = HTTP_STRING( "BITS-Original-Request-URL: " );
AdditionalHeaders += HTTPStackStringHandle( RequestURL );
AdditionalHeaders += HTTP_STRING( "\r\n" );
if ( BITS_NOTIFICATION_TYPE_POST_BYREF == m_DirectoryConfig->m_NotificationType )
{
// Add the path to the request datafile name
AdditionalHeaders += HTTP_STRING( "BITS-Request-DataFile-Name: " );
AdditionalHeaders += HTTPStackStringHandle( m_CacheFileDirectoryAndFile );
AdditionalHeaders += HTTP_STRING( "\r\n" );
// Add the path to where to place the response datafile name
AdditionalHeaders += HTTP_STRING( "BITS-Response-DataFile-Name: " );
AdditionalHeaders += HTTPStackStringHandle( m_ResponseFileDirectoryAndFile );
AdditionalHeaders += HTTP_STRING( "\r\n" );
buf.dwBufferTotal = 0;
}
if ( !HttpAddRequestHeaders(
hRequest,
AdditionalHeaders,
(DWORD)AdditionalHeaders.Size(),
HTTP_ADDREQ_FLAG_ADD | HTTP_ADDREQ_FLAG_REPLACE ) )
{
Log( LOG_ERROR, "HttpAddRequestHeaders failed error %x",
HRESULT_FROM_WIN32( GetLastError() ) );
throw ServerException( HRESULT_FROM_WIN32( GetLastError() ), 0, 0x7 );
}
if ( buf.dwBufferTotal )
{
Log( LOG_INFO, "Sending data..." );
if ( !HttpSendRequestEx(
hRequest,
&buf,
NULL,
HSR_INITIATE,
NULL ) )
{
Log( LOG_ERROR, "HttpSendRequestEx failed error %x",
HRESULT_FROM_WIN32( GetLastError() ) );
throw ServerException( HRESULT_FROM_WIN32( GetLastError() ), 0, 0x7 );
}
ReopenCacheFileAsSync();
SetFilePointer( m_CacheFile, 0, NULL, FILE_BEGIN );
DWORD BytesRead;
DWORD TotalRead = 0;
do
{
BOOL b;
if (!(b = ReadFile (m_CacheFile,
m_NotifyBuffer,
sizeof(m_NotifyBuffer),
&BytesRead,
NULL)))
{
Log( LOG_ERROR, "ReadFile failed, error %x",
HRESULT_FROM_WIN32( GetLastError() ) );
throw ServerException( HRESULT_FROM_WIN32( GetLastError() ), 0, 0x7 );
}
TotalRead += BytesRead;
if (BytesRead > 0)
{
DWORD BytesWritten;
DWORD TotalWritten = 0;
do
{
if (!(b = InternetWriteFile( hRequest,
m_NotifyBuffer + TotalWritten,
BytesRead - TotalWritten,
&BytesWritten)))
{
Log( LOG_ERROR, "InternetWriteFile failed, error %x",
HRESULT_FROM_WIN32( GetLastError() ) );
throw ServerException( HRESULT_FROM_WIN32( GetLastError() ), 0, 0x7 );
}
TotalWritten += BytesWritten;
} while( TotalWritten != BytesRead );
}
}
while ( TotalRead < buf.dwBufferTotal );
if ( !HttpEndRequest( hRequest, NULL, 0, 0 ) )
{
Log( LOG_ERROR, "HttpEndRequest failed, error %x",
HRESULT_FROM_WIN32( GetLastError() ) );
throw ServerException( HRESULT_FROM_WIN32( GetLastError() ), 0, 0x7 );
}
}
else
{
if ( !HttpSendRequest(
hRequest,
NULL,
0,
NULL,
0 ) )
{
Log( LOG_ERROR, "HttpSendRequest failed, error %x",
HRESULT_FROM_WIN32( GetLastError() ) );
throw ServerException( HRESULT_FROM_WIN32( GetLastError() ), 0,0x7 );
}
}
//
// Check for a BITS-Static-Response-URL. If a static response is given,
// remove the response file and format URL
//
bool HasStaticResponse = TestResponseHeader( hRequest, HTTP_STRING( "BITS-Static-Response-URL" ) );
if ( HasStaticResponse )
{
if ( INVALID_HANDLE_VALUE != hResponseFile )
{
CloseHandle( hResponseFile );
hResponseFile = INVALID_HANDLE_VALUE;
BITSDeleteFile( m_ResponseFileDirectoryAndFile );
}
}
//
// drain the pipe.
//
Log( LOG_INFO, "Processing backend response" );
DWORD dwStatus;
DWORD dwLength;
dwLength = sizeof(dwStatus);
if (! HttpQueryInfo(hRequest,
HTTP_QUERY_STATUS_CODE | HTTP_QUERY_FLAG_NUMBER,
(LPVOID)&dwStatus,
&dwLength,
NULL))
{
Log( LOG_ERROR, "HttpQueryInfo failed, error %x",
HRESULT_FROM_WIN32( GetLastError() ) );
throw ServerException( HRESULT_FROM_WIN32( GetLastError() ), 0, 0x7 );
}
DWORD BytesRead;
DWORD BytesWritten;
do
{
if (!InternetReadFile( hRequest,
m_NotifyBuffer,
sizeof( m_NotifyBuffer ),
&BytesRead
))
{
Log( LOG_ERROR, "InternetReadFile failed, error %x",
HRESULT_FROM_WIN32( GetLastError() ) );
throw ServerException( HRESULT_FROM_WIN32( GetLastError() ), 0, 0x7 );
}
if ( INVALID_HANDLE_VALUE != hResponseFile )
{
if ( !WriteFile(
hResponseFile,
m_NotifyBuffer,
BytesRead,
&BytesWritten,
NULL ) )
{
Log( LOG_ERROR, "WriteFile failed, error %x",
HRESULT_FROM_WIN32( GetLastError() ) );
throw ServerException( HRESULT_FROM_WIN32( GetLastError() ), 0, 0x7 );
}
}
}
while ( BytesRead > 0 );
//
// Retrieve or compute the reply URL( the default is to use self-relative form).
//
StringHandle ReplyURL;
if ( HasStaticResponse )
{
ReplyURL = GetResponseHeader( hRequest, HTTP_STRING( "BITS-Static-Response-URL" ) );
}
else
{
if ( INVALID_FILE_ATTRIBUTES != GetFileAttributes( m_ResponseFileDirectoryAndFile ) )
{
ReplyURL = m_DirectoryConfig->m_ConnectionsDir;
ReplyURL += "\\";
ReplyURL += m_SessionIdString;
ReplyURL += "\\";
ReplyURL += "responsefile";
}
}
if ( TestResponseHeader( hRequest, HTTP_STRING( "BITS-Copy-File-To-Destination" ) ) )
{
BITSRenameFile( m_CacheFileDirectoryAndFile,
m_PhysicalPathAndFile );
}
InternetCloseHandle( hRequest );
InternetCloseHandle( hConnect );
InternetCloseHandle( hInternet );
hRequest = hInternet = hConnect = NULL;
if ( INVALID_HANDLE_VALUE != hResponseFile )
CloseHandle( hResponseFile );
hResponseFile = INVALID_HANDLE_VALUE;
if ( ReplyURL.Size() )
{
Log( LOG_INFO, "The backend supplied a response url, send client response including URL" );
if ( 200 != dwStatus )
{
SendResponse(
"Pragma: no-cache\r\n"
"BITS-Packet-Type: Ack\r\n"
"Content-Length: 0\r\n"
"BITS-Received-Content-Range: %I64u\r\n"
"BITS-Reply-URL: %s\r\n"
"BITS-Error-Context: 0x7\r\n"
"\r\n",
dwStatus,
CacheFileSize,
(const char*)ReplyURL );
}
else
{
SendResponse(
"Pragma: no-cache\r\n"
"BITS-Packet-Type: Ack\r\n"
"Content-Length: 0\r\n"
"BITS-Received-Content-Range: %I64u\r\n"
"BITS-Reply-URL: %s\r\n"
"\r\n",
dwStatus,
CacheFileSize,
(const char*)ReplyURL );
}
}
else
{
Log( LOG_INFO, "The backend didn't supply a response URL, sending simple client response" );
if ( 200 != dwStatus )
{
SendResponse(
"Pragma: no-cache\r\n"
"BITS-Packet-Type: Ack\r\n"
"Content-Length: 0\r\n"
"BITS-Received-Content-Range: %I64u\r\n"
"BITS-Error-Context: 0x7\r\n"
"\r\n",
dwStatus,
CacheFileSize );
}
else
{
SendResponse(
"Pragma: no-cache\r\n"
"BITS-Packet-Type: Ack\r\n"
"Content-Length: 0\r\n"
"BITS-Received-Content-Range: %I64u\r\n"
"\r\n",
dwStatus,
CacheFileSize );
}
}
}
catch( ServerException Exception )
{
// cleanup
if ( INVALID_HANDLE_VALUE != hResponseFile )
{
CloseHandle( hResponseFile );
hResponseFile = INVALID_HANDLE_VALUE;
}
DeleteFile( m_ResponseFileDirectoryAndFile );
if ( hRequest )
InternetCloseHandle( hRequest );
if ( hConnect )
InternetCloseHandle( hConnect );
if ( hInternet )
InternetCloseHandle( hInternet );
throw;
}
}
bool
ServerRequest::TestResponseHeader(
HINTERNET hRequest,
const HTTP_STRING_TYPE *Header )
{
// test for a header in the notification response. If the header is
// found return true, false if not. Throw an exception on an error.
#if defined( USE_WININET )
SIZE_T HeaderSize = strlen(Header) + 2;
WorkStringBufferA WorkStringBufferData( HeaderSize );
char *HeaderDup = WorkStringBufferData.GetBuffer();
memcpy( HeaderDup, Header, ( HeaderSize - 1 ) * sizeof( char ) );
#else
SIZE_T HeaderSize = wcslen(Header) + 2;
WorkStringBufferW WorkStringBufferData( HeaderSize );
HTTP_STRING_TYPE *HeaderDup = ( HTTP_STRING_TYPE * )WorkStringBufferData.GetBuffer();
memcpy( HeaderDup, Header, ( HeaderSize - 1 ) * sizeof( WCHAR ) );
#endif
DWORD BufferLength = (DWORD)HeaderSize;
BOOL Result =
HttpQueryInfo(
hRequest,
HTTP_QUERY_CUSTOM,
HeaderDup,
&BufferLength,
NULL );
if ( Result )
return true;
DWORD dwLastError = GetLastError();
if ( ERROR_INSUFFICIENT_BUFFER == dwLastError )
return true;
if ( ERROR_HTTP_HEADER_NOT_FOUND == dwLastError )
return false;
Log( LOG_ERROR, "Unable to test response header %s, error %x",
(const char*) StringHandle( Header ), HRESULT_FROM_WIN32( GetLastError() ) );
throw ServerException( HRESULT_FROM_WIN32( dwLastError ) );
}
StringHandle
ServerRequest::GetResponseHeader(
HINTERNET hRequest,
const HTTP_STRING_TYPE *Header )
{
// Retrieve a header from a notification response. If the header is not
// found or an other error occures, throw an exception.
#if defined( USE_WININET )
SIZE_T HeaderSize = strlen( Header );
DWORD BufferLength = (DWORD)( ( HeaderSize + 1024 ) & ~( 1024 - 1 ) );
#else
SIZE_T HeaderSize = wcslen( Header );
DWORD BufferLength = (DWORD)( ( HeaderSize + 1024 ) & ~( 1024 - 1 ) );
#endif
HTTPStackStringHandle RetVal;
while(1)
{
HTTP_STRING_TYPE *Buffer = RetVal.AllocBuffer( BufferLength );
#if defined( USE_WININET )
memcpy( Buffer, Header, ( HeaderSize + 1 ) * sizeof( char ) );
#else
memcpy( Buffer, Header, ( HeaderSize + 1 ) * sizeof( WCHAR ) );
#endif
BOOL Result =
HttpQueryInfo(
hRequest,
HTTP_QUERY_CUSTOM,
Buffer,
&BufferLength,
NULL );
if ( Result )
{
RetVal.SetStringSize();
return StringHandle( RetVal );
}
DWORD dwError = GetLastError();
if ( ERROR_INSUFFICIENT_BUFFER != dwError )
{
Log( LOG_ERROR, "Unable to get response header %s, error %x",
( const char *) StringHandle( Header ), HRESULT_FROM_WIN32( GetLastError() ) );
throw ServerException( HRESULT_FROM_WIN32( dwError ) );
}
RetVal = HTTPStackStringHandle();
}
}
void
ServerRequest::CloseSession()
{
// Handles the Close-Session command from the client.
CrackSessionId();
CrackPhysicalPath();
if ( BITS_NOTIFICATION_TYPE_NONE == m_DirectoryConfig->m_NotificationType )
{
BITSRenameFile( m_CacheFileDirectoryAndFile,
m_PhysicalPathAndFile );
}
else
{
BITSDeleteFile( m_CacheFileDirectoryAndFile );
}
BITSDeleteFile( m_ResponseFileDirectoryAndFile );
RemoveDirectory( m_ConnectionDirectory );
RemoveDirectory( m_ConnectionsDirectory );
SendResponse(
"Pragma: no-cache\r\n"
"BITS-Packet-Type: Ack\r\n"
"Content-Length: 0\r\n"
"\r\n" );
LogSessionClose( m_SessionId );
}
void
ServerRequest::CancelSession()
{
// Handles the Cancel-Session command from the client. Deletes
// all the temporary files, of the current state.
CrackSessionId();
CrackPhysicalPath();
BITSDeleteFile( m_CacheFileDirectoryAndFile );
BITSDeleteFile( m_ResponseFileDirectoryAndFile );
RemoveDirectory( m_ConnectionDirectory );
RemoveDirectory( m_ConnectionsDirectory );
SendResponse(
"Pragma: no-cache\r\n"
"BITS-Packet-Type: Ack\r\n"
"Content-Length: 0\r\n"
"\r\n" );
LogSessionCancel( m_SessionId );
}
void
ServerRequest::Ping()
{
// Handles the Ping command which is essentually just a no-op.
SendResponse(
"Pragma: no-cache\r\n"
"BITS-Packet-Type: Ack\r\n"
"Content-Length: 0\r\n"
"\r\n" );
}
void
ServerRequest::CrackPhysicalPath()
{
// Given a physical path, compute the destination cache directory and filename.
// The physical path is a directory, use the original name from the client.
const CHAR *PathTranslated = m_ExtensionControlBlock->lpszPathTranslated;
// perform some basic tests on the file name
StringHandle NewPathTranslated;
DWORD Attributes =
GetFileAttributes( m_ExtensionControlBlock->lpszPathTranslated );
if ( (DWORD)INVALID_FILE_ATTRIBUTES == Attributes )
{
if ( GetLastError() != ERROR_FILE_NOT_FOUND )
{
Log( LOG_ERROR, "Unable to get the file attributes for %s, error 0x%8.8X",
m_ExtensionControlBlock->lpszPathTranslated, HRESULT_FROM_WIN32( GetLastError() ) );
throw ServerException( HRESULT_FROM_WIN32( GetLastError() ) );
}
}
else
{
// file exists, check if its a directory
if ( FILE_ATTRIBUTE_DIRECTORY & Attributes )
{
Log( LOG_ERROR, "Uploading to directories are not supported" );
throw ServerException( E_INVALIDARG );
}
}
DWORD Result =
GetFullPathNameA(
PathTranslated,
0,
NULL,
NULL );
if ( !Result )
{
Log( LOG_ERROR, "Unable to get full path name for %s, error 0x%8.8X",
m_ExtensionControlBlock->lpszPathTranslated, HRESULT_FROM_WIN32( GetLastError() ) );
throw ServerException( HRESULT_FROM_WIN32( GetLastError() ) );
}
DWORD RequiredBufferSize = Result;
WorkStringBuffer WorkCrackBuffer( RequiredBufferSize + 1 );
char *CrackBuffer = WorkCrackBuffer.GetBuffer();
char *FilePart = NULL;
Result =
GetFullPathNameA(
PathTranslated,
RequiredBufferSize,
CrackBuffer,
&FilePart );
if ( !Result )
{
DWORD Error = GetLastError();
Log( LOG_ERROR, "Unable to get full path name for %s, error 0x%8.8X",
m_ExtensionControlBlock->lpszPathTranslated, HRESULT_FROM_WIN32( Error ) );
throw ServerException( HRESULT_FROM_WIN32( Error ) );
}
if ( Result > RequiredBufferSize )
{
Log( LOG_ERROR, "Unable to get full path name for %s since the required buffer size changed.",
m_ExtensionControlBlock->lpszPathTranslated );
throw ServerException( E_OUTOFMEMORY );
}
if ( !FilePart ||
*FilePart == '\0' ||
FilePart == CrackBuffer )
{
Log( LOG_ERROR, "Request for %s is invalid since it doesn't contain both a file and a directory.",
m_ExtensionControlBlock->lpszPathTranslated );
throw ServerException( E_INVALIDARG );
}
// validate that the physical path is below the virtual directory root
{
SIZE_T VDirPathSize = m_DirectoryConfig->m_PhysicalPath.Size();
if ( _strnicmp( m_DirectoryConfig->m_PhysicalPath, CrackBuffer, VDirPathSize ) != 0 )
{
Log( LOG_ERROR, "Path is not below the virtual directory root, error" );
throw ServerException( E_INVALIDARG );
}
}
m_PhysicalPathAndFile = CrackBuffer;
m_PhysicalFile = FilePart;
*FilePart = '\0';
m_PhysicalPath = CrackBuffer;
m_ConnectionsDirectory = m_PhysicalPath + m_DirectoryConfig->m_ConnectionsDir + "\\";
m_ConnectionDirectory = m_ConnectionsDirectory + m_SessionIdString + "\\";
m_CacheFileDirectoryAndFile = m_ConnectionDirectory + "requestfile";
m_ResponseFileDirectoryAndFile = m_ConnectionDirectory + "responsefile";
}
void
ServerRequest::OpenCacheFile( )
{
// Open the cache file.
m_CacheFile =
CreateFile(
m_CacheFileDirectoryAndFile,
GENERIC_READ | GENERIC_WRITE,
0,
NULL,
OPEN_ALWAYS,
FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED,
NULL );
if ( INVALID_HANDLE_VALUE == m_CacheFile )
{
Log( LOG_ERROR, "Unable to open cache file %s, error 0x%8.8X",
(const char*)m_CacheFileDirectoryAndFile,
HRESULT_FROM_WIN32( GetLastError() ) );
if (GetLastError() == ERROR_PATH_NOT_FOUND)
{
throw ServerException( BG_E_SESSION_NOT_FOUND );
}
throw ServerException( HRESULT_FROM_WIN32( GetLastError() ) );
}
}
void
ServerRequest::ReopenCacheFileAsSync()
{
// reopen the cache file as async so that it can be spooled synchronously over
// to the backend.
CloseCacheFile();
m_CacheFile =
CreateFile(
m_CacheFileDirectoryAndFile,
GENERIC_READ | GENERIC_WRITE,
0,
NULL,
OPEN_ALWAYS,
FILE_ATTRIBUTE_NORMAL,
NULL );
if ( INVALID_HANDLE_VALUE == m_CacheFile )
{
Log( LOG_ERROR, "Unable to reopen cache file %s, error 0x%8.8X",
(const char*)m_CacheFileDirectoryAndFile,
HRESULT_FROM_WIN32( GetLastError() ) );
if (GetLastError() == ERROR_PATH_NOT_FOUND)
{
throw ServerException( BG_E_SESSION_NOT_FOUND );
}
throw ServerException( HRESULT_FROM_WIN32( GetLastError() ) );
}
}
void
ServerRequest::CloseCacheFile()
{
// Close the cache file, if it isn't already closed.
if ( INVALID_HANDLE_VALUE != m_CacheFile )
{
if ( CloseHandle( m_CacheFile ) )
m_CacheFile = INVALID_HANDLE_VALUE;
}
}
void
ServerRequest::ForwardComplete(
LPEXTENSION_CONTROL_BLOCK lpECB,
PVOID pContext,
DWORD cbIO,
DWORD dwError)
{
// A do nothing callback for forwarding the request.
ServerRequest *This = (ServerRequest*)pContext;
This->Release( );
}
void
ServerRequest::ForwardToNextISAPI()
{
// IIS6 has changed behavior where the limit on * entries are ignored.
// To work around this problem, it is necessary to send the request back
// to IIS.
BOOL Result;
Result =
(*m_ExtensionControlBlock->ServerSupportFunction)(
m_ExtensionControlBlock->ConnID,
HSE_REQ_IO_COMPLETION,
(LPVOID)ForwardComplete,
0,
(LPDWORD)this );
if ( !Result )
{
Log( LOG_ERROR, "Unable to set callback to ForwardComplete, error %x",
HRESULT_FROM_WIN32( GetLastError() ) );
throw ServerException( HRESULT_FROM_WIN32( GetLastError() ) );
}
HSE_EXEC_URL_INFO ExecInfo;
memset( &ExecInfo, 0, sizeof( ExecInfo ) );
#define HSE_EXEC_URL_IGNORE_CURRENT_INTERCEPTOR 0x04
ExecInfo.dwExecUrlFlags = HSE_EXEC_URL_IGNORE_CURRENT_INTERCEPTOR;
ScheduleAsyncOperation(
HSE_REQ_EXEC_URL,
(LPVOID)&ExecInfo,
NULL,
NULL );
return;
}
void
ServerRequest::GetConfig()
{
// Looks up the configuration to use for this request.
StringHandle InstanceMetaPath = GetServerVariable( "INSTANCE_META_PATH" );
StringHandle URL = GetServerVariable( "URL" );
m_DirectoryConfig = g_ConfigMan->GetConfig( InstanceMetaPath, URL );
}
void
ServerRequest::DispatchRequest()
{
//
// The main do it function, parse what kind of request the client is sending and
// dispatch it to the appropiate handler routines.
//
// This critical section is needed because IIS callbacks can happen on any time.
// The lock is needed to prevent a callback from happening while the dispatch
// routine is still running.
CriticalSectionLock CSLock( &m_cs );
try
{
if ( _stricmp( m_ExtensionControlBlock->lpszMethod, BITS_COMMAND_VERBA ) != 0 )
{
Log( LOG_CALLBEGIN, "Connection %p, Packet-Type: %s, Method: %s, Path %s",
m_ExtensionControlBlock->ConnID,
(const char*)"UNKNOWN",
m_ExtensionControlBlock->lpszMethod,
m_ExtensionControlBlock->lpszPathTranslated );
ForwardToNextISAPI();
return;
}
m_PacketType = GetServerVariable( "HTTP_BITS-PACKET-TYPE" );
Log( LOG_CALLBEGIN, "Connection %p, Packet-Type: %s, Method: %s, Path %s",
m_ExtensionControlBlock->ConnID,
(const char*)m_PacketType,
m_ExtensionControlBlock->lpszMethod,
m_ExtensionControlBlock->lpszPathTranslated );
GetConfig();
if ( !m_DirectoryConfig->m_UploadEnabled )
{
Log( LOG_ERROR, "BITS uploads are not enabled" );
throw ServerException( E_ACCESSDENIED, 501 );
}
if ( m_DirectoryConfig->m_ExecutePermissions & ( MD_ACCESS_EXECUTE | MD_ACCESS_SCRIPT ) )
{
Log( LOG_ERROR, "BITS uploads are disable because execute or script access is enabled" );
LogExecuteEnabled();
throw ServerException( E_ACCESSDENIED, 403 );
}
StringHandle ContentLength = GetServerVariable( "HTTP_Content-Length" );
if ( 1 != sscanf( (const char*)ContentLength, "%I64u", &m_ContentLength ) )
{
Log( LOG_ERROR, "The content length is broken" );
throw ServerException( E_INVALIDARG );
}
if ( m_ContentLength < m_ExtensionControlBlock->cbAvailable )
throw ServerException( E_INVALIDARG );
m_BytesToDrain = m_ContentLength - m_ExtensionControlBlock->cbAvailable;
//
// Dispatch to the correct method
//
// Create-session
// fragment
// Get-Reply-Url
// Close-Session
// Cancel-Session
// Ping ( Is server alive )
// keep this list ordered by frequency
if ( _stricmp( m_PacketType, PACKET_TYPE_FRAGMENT ) == 0 )
AddFragment();
else if ( _stricmp( m_PacketType, PACKET_TYPE_PING ) == 0 )
Ping();
else if ( _stricmp( m_PacketType, PACKET_TYPE_CREATE_SESSION ) == 0 )
CreateSession();
else if ( _stricmp( m_PacketType, PACKET_TYPE_CLOSE_SESSION ) == 0 )
CloseSession();
else if ( _stricmp( m_PacketType, PACKET_TYPE_CANCEL_SESSION ) == 0 )
CancelSession();
else
{
Log( LOG_ERROR, "Received unknown BITS packet type %s",
(const char*)m_PacketType );
throw ServerException( E_INVALIDARG );
}
}
catch( ServerException Exception )
{
SendResponse( Exception );
}
}
//
// IIS Logger functions
//
void IISLogger::LogString( const char *String, int Size )
{
DWORD StringSize = Size + 1;
(*m_ExtensionControlBlock->ServerSupportFunction)
(
m_ExtensionControlBlock->ConnID,
HSE_APPEND_LOG_PARAMETER,
(LPVOID)String,
&StringSize,
NULL
);
}
void IISLogger::LogError( ServerException Error )
{
char OutputStr[ 255 ];
StringCbPrintfA(
OutputStr,
sizeof( OutputStr ),
"(bits_error:,%u,0x%8.8X)",
Error.GetHttpCode(),
Error.GetCode() );
LogString( OutputStr, strlen( OutputStr ) );
}
void IISLogger::LogError( const GUID & SessionID, ServerException Error )
{
WCHAR GuidStr[ 50 ];
char OutputStr[ 255 ];
StringFromGUID2( SessionID, GuidStr, 50 );
StringCchPrintfA(
OutputStr,
sizeof( OutputStr ),
"(bits_error:%S,%u,0x%8.8X)",
GuidStr,
Error.GetHttpCode(),
Error.GetCode() );
LogString( OutputStr, strlen( OutputStr ) );
}
void IISLogger::LogNewSession( const GUID & SessionID )
{
WCHAR GuidStr[ 50 ];
char OutputStr[ 255 ];
StringFromGUID2( SessionID, GuidStr, 50 );
StringCbPrintfA(
OutputStr,
sizeof( OutputStr ),
"(bits_new_session:%S)",
GuidStr );
LogString( OutputStr, strlen( OutputStr ) );
}
void IISLogger::LogUploadComplete( const GUID & SessionID, UINT64 FileSize )
{
WCHAR GuidStr[ 50 ];
char OutputStr[ 255 ];
StringFromGUID2( SessionID, GuidStr, 50 );
StringCbPrintfA(
OutputStr,
sizeof( OutputStr ),
"(bits_upload_complete:%S,%I64u)",
GuidStr,
FileSize );
LogString( OutputStr, strlen( OutputStr ) );
}
void IISLogger::LogSessionClose( const GUID & SessionID )
{
WCHAR GuidStr[ 50 ];
char OutputStr[ 255 ];
StringFromGUID2( SessionID, GuidStr, 50 );
StringCbPrintfA(
OutputStr,
sizeof( OutputStr ),
"(bits_close_session:%S)",
GuidStr );
LogString( OutputStr, strlen( OutputStr ) );
}
void IISLogger::LogSessionCancel( const GUID & SessionID )
{
WCHAR GuidStr[ 50 ];
char OutputStr[ 255 ];
StringFromGUID2( SessionID, GuidStr, 50 );
StringCbPrintfA(
OutputStr,
sizeof( OutputStr ),
"(bits_cancel_session:%S)",
GuidStr );
LogString( OutputStr, strlen( OutputStr ) );
}
void IISLogger::LogExecuteEnabled()
{
char OutputStr[ 255 ];
StringCchPrintfA(
OutputStr,
sizeof( OutputStr ),
"(bits_execute_enabled)" );
LogString( OutputStr, strlen( OutputStr ) );
}
ServerRequest *g_LastRequest = NULL;
//
// AsyncReader functions
//
AsyncReader::AsyncReader(
ServerRequest *Request,
UINT64 BytesToDrain,
UINT64 BytesToWrite,
UINT64 WriteOffset,
bool IsLastBlock,
HANDLE WriteHandle,
char *PrereadBuffer,
DWORD PrereadSize ) :
m_Request( Request ),
m_BytesToDrain( BytesToDrain ),
m_BytesToWrite( BytesToWrite ),
m_WriteOffset( WriteOffset ),
m_ReadOffset( WriteOffset ),
m_IsLastBlock( IsLastBlock ),
m_WriteHandle( WriteHandle ),
m_BytesToRead( BytesToWrite ),
m_PrereadBuffer( PrereadBuffer ),
m_PrereadSize( PrereadSize ),
m_OperationsPending( 0 ),
m_ReadBuffer( 0 ),
m_WriteBuffer( 0 ),
m_BuffersToWrite( 0 ),
m_Error( S_OK ),
m_WritePending( false ),
m_ReadPending( false ),
m_TotalBytesRead( 0 ),
m_ThreadToken( NULL ),
m_ErrorValid( false )
{
#if defined CLEARASYNCBUFFERS
for ( int i = 0; i < NUMBER_OF_IO_BUFFERS; i++ )
{
memset( m_IOBuffers + i, i, sizeof( *m_IOBuffers ) );
}
#endif
if ( !OpenThreadToken( GetCurrentThread(), TOKEN_ALL_ACCESS, TRUE, &m_ThreadToken ) )
{
Log( LOG_ERROR, "Unable to retrieve the current thread token, error %x",
HRESULT_FROM_WIN32( GetLastError() ) );
throw ServerException( HRESULT_FROM_WIN32( GetLastError() ) );
}
if ( m_BytesToDrain && m_PrereadSize )
{
Log( LOG_INFO, "Have both a Preread and bytes to drain, deal with it." );
Log( LOG_INFO, "BytesToDrain: %I64u, PrereadSize: %u", m_BytesToDrain, m_PrereadSize );
DWORD DrainBytesInPreread = (DWORD)min( m_BytesToDrain, PrereadSize );
m_PrereadBuffer += DrainBytesInPreread;
m_PrereadSize -= DrainBytesInPreread;
m_BytesToDrain -= DrainBytesInPreread;
Log( LOG_INFO, "Bytes to drain from preread, %u", DrainBytesInPreread );
}
ASSERT( !( m_BytesToDrain && m_PrereadSize ) );
m_BytesToRead = m_BytesToRead + m_BytesToDrain - m_PrereadSize;
m_ReadOffset = m_ReadOffset - m_BytesToDrain + m_PrereadSize;
if ( m_BytesToRead )
{
// Setup the read completion callback
BOOL Result =
(*m_Request->m_ExtensionControlBlock->ServerSupportFunction)(
m_Request->m_ExtensionControlBlock->ConnID,
HSE_REQ_IO_COMPLETION,
(LPVOID)ReadCompleteWraper,
0,
(LPDWORD)this );
if ( !Result )
{
Log( LOG_ERROR, "Unable to set callback to ReadCompleteWraper, error %x",
HRESULT_FROM_WIN32( GetLastError() ) );
throw ServerException( HRESULT_FROM_WIN32( GetLastError() ) );
}
}
if ( INVALID_HANDLE_VALUE != m_WriteHandle )
{
BOOL Result =
BindIoCompletionCallback(
m_WriteHandle, // handle to file
(LPOVERLAPPED_COMPLETION_ROUTINE)WriteCompleteWraper, // callback
0 // reserved
);
if ( !Result )
{
Log( LOG_ERROR, "Unable to set write completion routing, error %x",
HRESULT_FROM_WIN32( GetLastError() ) );
throw ServerException( HRESULT_FROM_WIN32( GetLastError() ) );
}
}
// Queue the IO to a thread pool work item.
BOOL bResult =
QueueUserWorkItem( StartupIOWraper, this, WT_EXECUTEDEFAULT );
if ( !bResult )
{
Log( LOG_ERROR, "QueueUserWorkItem failed, error %x",
HRESULT_FROM_WIN32( GetLastError() ) );
throw ServerException( 500, HRESULT_FROM_WIN32( GetLastError() ) );
}
m_OperationsPending++;
Request->m_IsPending = true;
Request->AddRef();
}
AsyncReader::~AsyncReader()
{
if ( m_ThreadToken )
CloseHandle( m_ThreadToken );
}
void
AsyncReader::HandleError( ServerException Error )
{
m_ErrorValid = true;
m_Error = Error;
if ( m_OperationsPending )
return; // Continue to wait for operations to exit.
m_Request->HandleIOError( this, Error, m_TotalBytesRead );
return;
}
void
AsyncReader::CompleteIO()
{
m_Request->CompleteIO( this, m_TotalBytesRead );
return;
}
void
AsyncReader::StartReadRequest()
{
// start a new IIS read request
DWORD BytesToRead;
IOBuffer *Buffer = m_IOBuffers + m_ReadBuffer;
if ( m_BytesToDrain )
{
Buffer->m_BufferWriteOffset = 0;
Buffer->m_BufferUsed = 0;
BytesToRead = (DWORD)min( m_BytesToDrain, sizeof( Buffer->m_Buffer ) );
}
else
{
Buffer->m_BufferWriteOffset = m_ReadOffset;
Buffer->m_BufferUsed = 0;
BytesToRead = (DWORD)min( m_BytesToRead, sizeof( Buffer->m_Buffer ) );
}
Log( LOG_INFO, "Start Async Read, Connection %p, Buffer %u, Offset %I64u, Length %u",
m_Request->m_ExtensionControlBlock->ConnID,
m_ReadBuffer,
m_ReadOffset,
BytesToRead );
DWORD Flags = HSE_IO_ASYNC;
BOOL Result =
(*m_Request->m_ExtensionControlBlock->ServerSupportFunction)
(
m_Request->m_ExtensionControlBlock->ConnID,
HSE_REQ_ASYNC_READ_CLIENT,
Buffer->m_Buffer,
&BytesToRead,
&Flags
);
if ( !Result )
{
DWORD Error = GetLastError();
Log( LOG_ERROR, "HSE_REQ_ASYNC_READ_CLIENT failed, error 0x%8.8", Error );
throw ServerException( HRESULT_FROM_WIN32( Error ) );
}
m_OperationsPending++;
m_ReadPending = true;
m_Request->AddRef();
}
void
AsyncReader::StartWriteRequest()
{
// Start a new filesystem write request
OVERLAPPED *OverLapped = (OVERLAPPED*)this;
memset( OverLapped, 0, sizeof(*OverLapped) );
LPCVOID WriteBuffer;
DWORD BytesToWrite;
if ( m_PrereadSize )
{
// IIS preread data is handled seperatly. Drain it first.
WriteBuffer = m_PrereadBuffer;
BytesToWrite = m_PrereadSize;
}
else
{
IOBuffer *Buffer = m_IOBuffers + m_WriteBuffer;
ASSERT( m_WriteOffset == Buffer->m_BufferWriteOffset );
WriteBuffer = Buffer->m_Buffer;
BytesToWrite = Buffer->m_BufferUsed;
}
OverLapped->Offset = (DWORD)(m_WriteOffset & 0xFFFFFFFF);
OverLapped->OffsetHigh = (DWORD)((m_WriteOffset >> 32) & 0xFFFFFFFF);
Log( LOG_INFO, "Start Async Write, Connection %p, Buffer %u, Offset %I64u, Length %u",
m_Request->m_ExtensionControlBlock->ConnID,
m_WriteBuffer,
m_WriteOffset,
BytesToWrite );
BOOL Result =
WriteFile(
m_WriteHandle,
WriteBuffer,
BytesToWrite,
NULL,
OverLapped );
if ( !Result && GetLastError() != ERROR_IO_PENDING )
{
DWORD Error = GetLastError();
Log( LOG_ERROR, "WriteFileEx failed, error 0x%8.8X", GetLastError() );
throw ServerException( HRESULT_FROM_WIN32( Error ) );
}
m_OperationsPending++;
m_WritePending = true;
m_Request->AddRef();
}
void
AsyncReader::StartupIO( )
{
// Startup the necessary IO operations based on the
// buffer states. returns true if the upload operation should continue.
try
{
if ( m_ErrorValid )
throw ServerException( m_Error );
bool ScheduledIO = false;
if ( m_BytesToDrain )
{
StartReadRequest();
ScheduledIO = true;
}
else
{
if ( !m_BytesToWrite && !m_BytesToDrain )
return CompleteIO();
if ( !m_WritePending )
{
if ( m_PrereadSize )
{
StartWriteRequest();
ScheduledIO = true;
}
else if ( m_BuffersToWrite )
{
StartWriteRequest();
ScheduledIO = true;
}
}
if ( !m_ReadPending && m_BytesToRead && ( NUMBER_OF_IO_BUFFERS - m_BuffersToWrite ) )
{
StartReadRequest();
ScheduledIO = true;
}
}
if ( !ScheduledIO )
Log( LOG_INFO, "No IO scheduled" );
}
catch( ServerException Error )
{
HandleError( Error );
}
return;
}
void
AsyncReader::WriteComplete( DWORD dwError, DWORD BytesWritten )
{
// Called when a write is completed. Determine the next buffer to use and startup the correct IO operations.
// returns true is more operations are necessary.
try
{
Log( LOG_INFO, "Complete Async Write, Connection %p, Buffer %u, Offset %I64u, Length %u, Error %u",
m_Request->m_ExtensionControlBlock->ConnID,
m_WriteBuffer,
m_WriteOffset,
BytesWritten,
dwError );
if ( m_ErrorValid )
throw ServerException( m_Error );
m_WritePending = false;
if ( dwError )
throw ServerException( HRESULT_FROM_WIN32( dwError ) );
m_BytesToWrite -= BytesWritten;
if ( m_PrereadSize )
{
m_PrereadSize -= BytesWritten;
m_PrereadBuffer += BytesWritten;
m_WriteOffset += BytesWritten;
}
else
{
IOBuffer *Buffer = m_IOBuffers + m_WriteBuffer;
ASSERT( BytesWritten == Buffer->m_BufferUsed );
m_WriteOffset += Buffer->m_BufferUsed;
m_BuffersToWrite--;
#if defined CLEARASYNCBUFFERS
memset( Buffer, m_WriteBuffer, sizeof(*Buffer) );
#endif
m_WriteBuffer = (m_WriteBuffer + 1 ) % NUMBER_OF_IO_BUFFERS;
}
return StartupIO();
}
catch( ServerException Error )
{
Log( LOG_ERROR, "Error in write complete" );
HandleError( Error );
}
}
void
AsyncReader::ReadComplete( DWORD dwError, DWORD BytesRead )
{
// Called when a read operation is complete. determines if more operations should start or to
// complete the operation.
// returns true if more operations are operations are needed to complete the upload
try
{
Log( LOG_INFO, "Complete Async Read, Connection %p, Buffer %u, Offset %I64u, Length %u, Error %u",
m_Request->m_ExtensionControlBlock->ConnID,
m_ReadBuffer,
m_ReadOffset,
BytesRead,
dwError );
m_TotalBytesRead += BytesRead;
if ( m_ErrorValid )
throw ServerException( m_Error );
m_ReadPending = false;
if ( dwError )
throw ServerException( HRESULT_FROM_WIN32( dwError ) );
IOBuffer *Buffer = m_IOBuffers + m_ReadBuffer;
Buffer->m_BufferUsed = BytesRead;
m_BytesToRead -= BytesRead;
m_ReadOffset += BytesRead;
bool ScheduledIO = false;
if ( m_BytesToDrain )
m_BytesToDrain -= BytesRead;
else
{
m_BuffersToWrite++;
m_ReadBuffer = (m_ReadBuffer + 1 ) % NUMBER_OF_IO_BUFFERS;
}
StartupIO(); // Continue IO
}
catch( ServerException Error )
{
Log( LOG_ERROR, "Error in read complete" );
HandleError( Error );
}
}
DWORD
AsyncReader::StartupIOWraper( LPVOID Context )
{
AsyncReader *Reader = (AsyncReader*)Context;
{
CriticalSectionLock CSLock( &Reader->m_Request->m_cs );
Reader->m_OperationsPending--;
// Thread pool threads should start and end with no token
BITSSetCurrentThreadToken( Reader->m_ThreadToken );
Reader->StartupIO();
}
Reader->m_Request->Release();
// revert to previous impersonation.
BITSSetCurrentThreadToken( NULL );
return 0;
}
void CALLBACK
AsyncReader::WriteCompleteWraper(
DWORD dwErrorCode,
DWORD dwNumberOfBytesTransfered,
LPOVERLAPPED lpOverlapped )
{
// Wrapper around write completions
Log( LOG_INFO, "WriteCompleteWraper begin" );
AsyncReader *Reader = (AsyncReader*)lpOverlapped;
{
CriticalSectionLock CSLock( &Reader->m_Request->m_cs );
Reader->m_OperationsPending--;
// Thread pool threads should start and end with no token
BITSSetCurrentThreadToken( Reader->m_ThreadToken );
Reader->WriteComplete( dwErrorCode, dwNumberOfBytesTransfered );
}
Reader->m_Request->Release();
// revert to previous security
BITSSetCurrentThreadToken( NULL );
}
void WINAPI
AsyncReader::ReadCompleteWraper(
LPEXTENSION_CONTROL_BLOCK,
PVOID pContext,
DWORD cbIO,
DWORD dwError )
{
// wrapper around read completions
Log( LOG_INFO, "ReadCompleteWraper begin" );
AsyncReader *Reader = (AsyncReader*)pContext;
{
CriticalSectionLock CSLock( &Reader->m_Request->m_cs );
Reader->m_OperationsPending--;
#if defined( DBG )
{
HANDLE ThreadToken = NULL;
ASSERT( OpenThreadToken( GetCurrentThread(), TOKEN_ALL_ACCESS, TRUE, &ThreadToken ) );
if ( ThreadToken )
CloseHandle( ThreadToken );
}
#endif
Reader->ReadComplete( dwError, cbIO );
}
Reader->m_Request->Release();
}
bool g_ExtensionRunning = false;
class ConfigurationManager *g_ConfigMan = NULL;
class PropertyIDManager *g_PropertyMan = NULL;
BOOL WINAPI
GetExtensionVersion(
OUT HSE_VERSION_INFO * pVer
)
{
// IIS calls this to start everything up.
HRESULT Hr = S_OK;
ASSERT( !g_ExtensionRunning );
pVer->dwExtensionVersion = MAKELONG( HSE_VERSION_MINOR,
HSE_VERSION_MAJOR );
StringCbCopyA(
pVer->lpszExtensionDesc,
sizeof( pVer->lpszExtensionDesc ),
"BITS Server Extensions" );
if ( g_ExtensionRunning )
return true;
Hr = LogInit();
if ( FAILED( Hr ) )
{
SetLastError( Hr );
return false;
}
Log( LOG_INFO, "GetExtensionVersion called, starting init" );
try
{
Log( LOG_INFO, "Initializing Property Manager..." );
g_PropertyMan = new PropertyIDManager();
HRESULT Hr2 =
g_PropertyMan->LoadPropertyInfo();
if ( FAILED(Hr2) )
throw ServerException( Hr2 );
Log( LOG_INFO, "Initializing Configuration Manager..." );
g_ConfigMan = new ConfigurationManager();
}
catch( ServerException Exception )
{
Log( LOG_ERROR, "Error during initialization, 0x%8.8X", Exception.GetCode() );
delete g_ConfigMan;
delete g_PropertyMan;
LogClose();
SetLastError( Exception.GetCode() );
return false;
}
g_ExtensionRunning = true;
Log( LOG_INFO, "Initialization complete!" );
return true;
}
BOOL WINAPI
TerminateExtension(
IN DWORD dwFlags
)
{
//
// IIS calls this to shut everything down.
//
if ( !g_ExtensionRunning )
return true;
Log( LOG_INFO, "Shuting down config manager..." );
delete g_ConfigMan;
g_ConfigMan = NULL;
Log( LOG_INFO, "Shuting down property manager..." );
delete g_PropertyMan;
g_PropertyMan = NULL;
Log( LOG_INFO, "Closing logging, goodbye" );
LogClose();
g_ExtensionRunning = false;
return true;
}
DWORD WINAPI
HttpExtensionProc(
IN EXTENSION_CONTROL_BLOCK * pECB
)
{
//
// IIS calls this function for each request that is forwarded by the filter.
//
DWORD Result = HSE_STATUS_ERROR;
ServerRequest *Request = NULL;
try
{
g_LastRequest = Request = new ServerRequest( pECB );
Request->DispatchRequest();
Result = Request->IsPending() ? HSE_STATUS_PENDING : HSE_STATUS_SUCCESS;
}
catch( ServerException Exception )
{
IISLogger Logger( pECB );
Logger.LogError( Exception );
Result = HSE_STATUS_ERROR;
}
if ( Request )
Request->Release();
return Result;
}
HMODULE g_hinst;
BOOL WINAPI
DllMain(
IN HINSTANCE hinstDll,
IN DWORD dwReason,
IN LPVOID lpvContext
)
/*++
Function : DllMain
Description:
The initialization function for this DLL.
Arguments:
hinstDll - Instance handle of the DLL
dwReason - Reason why NT called this DLL
lpvContext - Reserved parameter for future use
Return Value:
Returns TRUE if successfull; otherwise FALSE.
--*/
{
// Note that appropriate initialization and termination code
// would be written within the switch statement below. Because
// this example is very simple, none is currently needed.
switch( dwReason ) {
case DLL_PROCESS_ATTACH:
g_hinst = hinstDll;
break;
case DLL_PROCESS_DETACH:
break;
}
return(TRUE);
}
#include "bitssrvcfgimp.h"