New Multisite DLL Or How to develop .NET project in a Root

#include "stdafx.h"
#include "string.h"
#include <atlbase.h>
#include <atlcoll.h>
#include <atlstr.h>

typedef CAtlMap<CString, CString> APPMAP;
APPMAP	_appMap;
HANDLE _hModule;
int FindDirectory(char *s);

BOOL APIENTRY DllMain( HANDLE hModule, 
                       DWORD  ul_reason_for_call, 
                       LPVOID lpReserved
					 )
{
	_hModule = hModule;
    return TRUE;
}

BOOL WINAPI __stdcall GetFilterVersion(HTTP_FILTER_VERSION *pVer)
{
	char sBuf1[5000];
	pVer->dwFilterVersion = pVer->dwServerFilterVersion;//HTTP_FILTER_REVISION;
	pVer->dwFlags = SF_NOTIFY_PREPROC_HEADERS|SF_NOTIFY_ORDER_HIGH ;
	strcpy(pVer->lpszFilterDesc, "MultiSite");
	//Load config
	GetModuleFileName((HMODULE)_hModule, sBuf1, sizeof(sBuf1));
	char * p = strrchr(sBuf1, '\\');
	*p = 0;
	strcat(sBuf1, "\\config.ini");
	CString sConfigFile = sBuf1;
	sBuf1[0] = 0;
	DWORD dwSize = sizeof(sBuf1);
	dwSize = GetPrivateProfileSection("websites", sBuf1, dwSize, sConfigFile);
	char *s = sBuf1;
	while(true)
	{
		int iLen = strlen(s);
		if( iLen == 0 )
			break;
		CString sName, sValue;
		char *p = s; 
		while(( *p != '=') && (*p != 0 ))
			p++;
		*p = 0;
		p++;
		sName = s;
		sValue = p;
		_appMap[sName.MakeLower().Trim()] = sValue.Trim();
		s += iLen + 1;
	}
	
  return TRUE;
}


DWORD WINAPI __stdcall HttpFilterProc(HTTP_FILTER_CONTEXT *pfc, DWORD NotificationType, VOID *pvData)
{
	char sBuf[1000];
	char sBuf1[1000];
	DWORD dwSize = sizeof(sBuf);
	char *s = sBuf;
	int iLen = 0;

	HTTP_FILTER_PREPROC_HEADERS *tmp = (PHTTP_FILTER_PREPROC_HEADERS)pvData;
	if( NotificationType == SF_NOTIFY_PREPROC_HEADERS )
	{
 		int iIndex = 0;
		tmp->GetHeader(pfc, const_cast<char*>("Host:"), sBuf, &dwSize);
		sBuf[dwSize] = 0;
		//strip out www. if Host starts with it.
		strlwr(sBuf);
		if( ( dwSize > 4) && ( sBuf[0] == 'w' ) && ( sBuf[1] == 'w' ) && ( sBuf[2] == 'w' ) && ( sBuf[3] == '.' ) )
			iIndex = 4;
		APPMAP::CPair *pr =_appMap.Lookup(&sBuf[iIndex]);
		if( pr == NULL )
			return SF_STATUS_REQ_NEXT_NOTIFICATION;  //have nothing to do.

		dwSize = sizeof(sBuf);
		tmp->GetHeader(pfc, const_cast<char*>("URL"), sBuf, &dwSize);
		sBuf[dwSize] = 0;
		//we got the directory. Let's check that it is not = to our folder. if yes then we do nothing.
		int iLen = FindDirectory(sBuf);
		if(( iLen == pr->m_value.GetLength() ) && ( _strnicmp( sBuf, pr->m_value, iLen) == 0 ))
			return SF_STATUS_REQ_NEXT_NOTIFICATION; //Do nothing

		//Append our folder to the URL. 
		strcpy(sBuf1, pr->m_value);
		strcat(sBuf1, sBuf);
		tmp->SetHeader(pfc, const_cast<char*>("URL"), sBuf1);
	}  
	return SF_STATUS_REQ_NEXT_NOTIFICATION;
}


//returns the lenght from "/" to the next "/"
inline int FindDirectory(char *s)
{
	if( *s != '/' )
		return 0;	//it must always start with '/' or we will not know what to do.
	int iLen = 1;
	s++;
	while(( *s != 0 ) && ( *s != '/' ))
	{
		s++;
		iLen++;	
	}
	return iLen;

}