Shaiya Packeter.

DWORD Address = 0;
DWORD ReturnAddress = 0;

bool ScanForAddress()
{
	DWORD Base = 0x00400000;
	DWORD SizeOfCode;

	DWORD i = Base;
	while ((memcmp((void *)i, "PE", 4)) && (i <= Base + 0x1000))
		i++;

	if (i <= Base + 0x1000)
		SizeOfCode = *(DWORD *)(i + 0x1C);

	BYTE Signature[] = {0x8B, 0xCB, 0x8B, 0xD1, 0xC1, 0xE9, 0x02, 0x8D, 0x43, 0x02,
						0x66, 0x89, 0x44, 0x24, 0x20};

	Address = dwFindPattern(Base + 0x1000, SizeOfCode, Signature, "xxxxxxxxxxxxxxx") - 0x38;
	ReturnAddress = Address + 6;

	if (Address)
		return true;
	else
		return false;
}

bool bDataCompare(const BYTE* pData, const BYTE* bMask, const char* szMask)
{
    for(;*szMask;++szMask,++pData,++bMask)
        if(*szMask=='x' && *pData!=*bMask ) 
            return false;
    return (*szMask) == NULL;
}

DWORD dwFindPattern(DWORD dwAddress,DWORD dwLen,BYTE *bMask,char * szMask)
{
    for(DWORD i=0; i < dwLen; i++)
        if( bDataCompare( (BYTE*)( dwAddress+i ),bMask,szMask) )
            return (DWORD)(dwAddress+i);  
    return 0;
}

char *buf;
int len;

void __declspec(naked) Detour()
{
	__asm
	{
		pushad
		pushfd
		mov ebp, esp
		mov eax, [esp+0x28]
		mov buf, eax;
		mov eax, [esp+0x2C]
		mov len, eax;
	}

	//Here you can call a function which displays the packet.
	//buf is a pointer to the packet and len indicates the length of it.

	__asm
	{
		popfd
		popad
		push ebp
		mov ebp, esp
		and esp, 0xFFFFFFF8
		jmp ReturnAddress
	}
}

void SetDetour()
{
	do
	{
		ScanForAddress();
		Sleep(1);
	}
	while (!Address);

	DWORD temp;
	VirtualProtect((void *)Address, 5, PAGE_EXECUTE_READWRITE, &temp);
	*(BYTE *)(Address) = 0xE9;
	*(DWORD *)(Address + 1) = (DWORD)&Detour - Address - 5;
}

void SendPacket(char *buf, int len)
{
	void (* InternalCall)(char *, int) = (void (__cdecl *)(char *,int)) Address;
	(* InternalCall)(buf, len);
}