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Code Editor : AsyncSocketEx.h

/*CAsyncSocketEx by Tim Kosse (Tim.Kosse@gmx.de)
            Version 1.3 (2003-04-26)
--------------------------------------------------------

Introduction:
-------------

CAsyncSocketEx is a replacement for the MFC class CAsyncSocket.
This class was written because CAsyncSocket is not the fastest WinSock
wrapper and it's very hard to add new functionality to CAsyncSocket
derived classes. This class offers the same functionality as CAsyncSocket.
Also, CAsyncSocketEx offers some enhancements which were not possible with
CAsyncSocket without some tricks.

How do I use it?
----------------
Basically exactly like CAsyncSocket.
To use CAsyncSocketEx, just replace all occurrences of CAsyncSocket in your
code with CAsyncSocketEx. If you did not enhance CAsyncSocket yourself in
any way, you won't have to change anything else in your code.

Why is CAsyncSocketEx faster?
-----------------------------

CAsyncSocketEx is slightly faster when dispatching notification event messages.
First have a look at the way CAsyncSocket works. For each thread that uses
CAsyncSocket, a window is created. CAsyncSocket calls WSAAsyncSelect with
the handle of that window. Until here, CAsyncSocketEx works the same way.
But CAsyncSocket uses only one window message (WM_SOCKET_NOTIFY) for all
sockets within one thread. When the window recieve WM_SOCKET_NOTIFY, wParam
contains the socket handle and the window looks up an CAsyncSocket instance
using a map. CAsyncSocketEx works differently. It's helper window uses a
wide range of different window messages (WM_USER through 0xBFFF) and passes
a different message to WSAAsyncSelect for each socket. When a message in
the specified range is received, CAsyncSocketEx looks up the pointer to a
CAsyncSocketEx instance in an Array using the index of message - WM_USER.
As you can see, CAsyncSocketEx uses the helper window in a more efficient
way, as it don't have to use the slow maps to lookup it's own instance.
Still, speed increase is not very much, but it may be noticeable when using
a lot of sockets at the same time.
Please note that the changes do not affect the raw data throughput rate,
CAsyncSocketEx only dispatches the notification messages faster.

What else does CAsyncSocketEx offer?
------------------------------------

CAsyncSocketEx offers a flexible layer system. One example is the proxy layer.
Just create an instance of the proxy layer, configure it and add it to the layer
chain of your CAsyncSocketEx instance. After that, you can connect through
proxies.
Benefit: You don't have to change much to use the layer system.
Another layer that is currently in development is the SSL layer to establish
SSL encrypted connections.

License
-------

Feel free to use this class, as long as you don't claim that you wrote it
and this copyright notice stays intact in the source files.
If you use this class in commercial applications, please send a short message
to tim.kosse@gmx.de
*/

#if !defined(AFX_ASYNCSOCKETEX_H__AA9E4531_63B1_442F_9A71_09B2FEEDF34E__INCLUDED_)
#define AFX_ASYNCSOCKETEX_H__AA9E4531_63B1_442F_9A71_09B2FEEDF34E__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#ifdef _AFX
#define CStdString CString
#define CStdStringW CStringW
#define CStdStringA CStringA
#endif //_AFX

#define FD_FORCEREAD (1<<15)

#include <winsock2.h>
#include <Ws2tcpip.h>

class CAsyncSocketExHelperWindow;

extern "C" {
	typedef int (FAR PASCAL *t_getaddrinfo)(const char* nodename, const char* servname, const struct addrinfo* hints, struct addrinfo** res);
	typedef	void (FAR PASCAL *t_freeaddrinfo)(struct addrinfo* ai);
}

#ifndef NOLAYERS
class CAsyncSocketExLayer;

struct t_callbackMsg
{
	CAsyncSocketExLayer* pLayer;
	int nType;
	int nParam1;
	int nParam2;
	char* str;
};

#endif //NOLAYERS

class CCriticalSectionWrapper;
class CAsyncSocketEx
{
public:
	///////////////////////////////////////
	//Functions that imitate CAsyncSocket//
	///////////////////////////////////////

//Construction
	//------------

//Constructs a CAsyncSocketEx object.
	CAsyncSocketEx();
	virtual ~CAsyncSocketEx();

//Attributes
	//---------

//Detaches a socket handle from a CAsyncSocketEx object.
	SOCKET Detach( );

//Gets the error status for the last operation that failed.
	static int GetLastError();

//Gets the address of the peer socket to which the socket is connected.
	BOOL GetPeerName( CStdString& rPeerAddress, UINT& rPeerPort );

//Gets the local name for a socket.
	BOOL GetSockName( CStdString& rSocketAddress, UINT& rSocketPort );

//Retrieves a socket option.
	BOOL GetSockOpt(int nOptionName, void* lpOptionValue, int* lpOptionLen, int nLevel = SOL_SOCKET);

//Sets a socket option.
	BOOL SetSockOpt(int nOptionName, const void* lpOptionValue, int nOptionLen, int nLevel = SOL_SOCKET);

//Gets the socket family
	int GetFamily() const;

//Sets the socket family
	bool SetFamily(int nFamily);

//Operations
	//----------

//Accepts a connection on the socket.
	virtual BOOL Accept( CAsyncSocketEx& rConnectedSocket, SOCKADDR* lpSockAddr = NULL, int* lpSockAddrLen = NULL );

//Associates a local address with the socket.
	BOOL Bind(UINT nSocketPort, LPCTSTR lpszSocketAddress);
	BOOL Bind(const SOCKADDR* lpSockAddr, int nSockAddrLen);

//Closes the socket.
	virtual void Close();

//Establishes a connection to a peer socket.
	virtual BOOL Connect(LPCTSTR lpszHostAddress, UINT nHostPort);
	virtual BOOL Connect(const SOCKADDR* lpSockAddr, int nSockAddrLen);

//Controls the mode of the socket.
	BOOL IOCtl( long lCommand, DWORD* lpArgument );

//Establishes a socket to listen for incoming connection requests.
	BOOL Listen( int nConnectionBacklog = 5 );

//Receives data from the socket.
	virtual int Receive(void* lpBuf, int nBufLen, int nFlags = 0);

//Sends data to a connected socket.
	virtual int Send(const void* lpBuf, int nBufLen, int nFlags = 0);

//Disables Send and/or Receive calls on the socket.
	BOOL ShutDown( int nHow = sends );
	enum { receives = 0, sends = 1, both = 2 };

//Overridable Notification Functions
	//----------------------------------

//Notifies a listening socket that it can accept pending connection requests by calling Accept.
	virtual void OnAccept(int nErrorCode);

//Notifies a socket that the socket connected to it has closed.
	virtual void OnClose(int nErrorCode);

//Notifies a connecting socket that the connection attempt is complete, whether successfully or in error.
	virtual void OnConnect(int nErrorCode);

//Notifies a listening socket that there is data to be retrieved by calling Receive.
	virtual void OnReceive(int nErrorCode);

//Notifies a socket that it can send data by calling Send.
	virtual void OnSend(int nErrorCode);

////////////////////////
	//Additional functions//
	////////////////////////

#ifndef NOLAYERS
	//Resets layer chain.
	void RemoveAllLayers();

//Attaches a new layer to the socket.
	BOOL AddLayer(CAsyncSocketExLayer *pLayer);

//Is a layer attached to the socket?
	BOOL IsLayerAttached() const;
#endif //NOLAYERS

//Returns the handle of the socket.
	SOCKET GetSocketHandle();

//Trigers an event on the socket
	// Any combination of FD_READ, FD_WRITE, FD_CLOSE, FD_ACCEPT, FD_CONNECT and FD_FORCEREAD is valid for lEvent.
	BOOL TriggerEvent(long lEvent);

protected:
	//Strucure to hold the socket data
	struct t_AsyncSocketExData
	{
		SOCKET hSocket; //Socket handle
		int nSocketIndex; //Index of socket, required by CAsyncSocketExHelperWindow
		int nFamily;
		addrinfo *addrInfo, *nextAddr; // Iterate through protocols on connect failure
		bool onCloseCalled; // Set to true on first received OnClose event
	} m_SocketData;

//If using layers, only the events specified with m_lEvent will send to the event handlers.
	long m_lEvent;

//AsyncGetHostByName
	char *m_pAsyncGetHostByNameBuffer; //Buffer for hostend structure
	HANDLE m_hAsyncGetHostByNameHandle; //TaskHandle
	int m_nAsyncGetHostByNamePort; //Port to connect to

//Returns the handle of the helper window
	HWND GetHelperWindowHandle();

//Attaches socket handle to helper window
	void AttachHandle(SOCKET hSocket);

//Detaches socket handle to helper window
	void DetachHandle(SOCKET hSocket);

//Critical section for thread synchronization
	static CCriticalSectionWrapper m_sGlobalCriticalSection;

//Pointer to the data of the local thread
	struct t_AsyncSocketExThreadData
	{
		CAsyncSocketExHelperWindow *m_pHelperWindow;
		int nInstanceCount;
		DWORD nThreadId;
		std::list<CAsyncSocketEx*> layerCloseNotify;
	} *m_pLocalAsyncSocketExThreadData;

//List of the data structures for all threads
	static struct t_AsyncSocketExThreadDataList
	{
		t_AsyncSocketExThreadDataList *pNext;
		t_AsyncSocketExThreadData *pThreadData;
	} *m_spAsyncSocketExThreadDataList;

//Initializes Thread data and helper window, fills m_pLocalAsyncSocketExThreadData
	BOOL InitAsyncSocketExInstance();

//Destroys helper window after last instance of CAsyncSocketEx in current thread has been closed
	void FreeAsyncSocketExInstance();

// Iterate through protocols on failure
	bool TryNextProtocol();

void ResendCloseNotify();

#ifndef NOLAYERS
	// Add a new notification to the list of pending callbacks
	void AddCallbackNotification(const t_callbackMsg& msg);
#endif // NOLAYERS

#ifndef NOSOCKETSTATES
	int m_nPendingEvents;

int GetState() const;
	void SetState(int nState);

int m_nState;
#endif //NOSOCKETSTATES

#ifndef NOLAYERS
	//Layer chain
	CAsyncSocketExLayer *m_pFirstLayer;
	CAsyncSocketExLayer *m_pLastLayer;

friend CAsyncSocketExLayer;

//Called by the layers to notify application of some events
	virtual int OnLayerCallback(std::list<t_callbackMsg>& callbacks);
#endif //NOLAYERS

// Used by Bind with AF_UNSPEC sockets
	UINT m_nSocketPort;
	LPTSTR m_lpszSocketAddress;

// imported IPv6 functions
	static HMODULE m_hDll;

static t_getaddrinfo p_getaddrinfo;
	static t_freeaddrinfo p_freeaddrinfo;

friend CAsyncSocketExHelperWindow;

#ifndef NOLAYERS
	// Pending callbacks
	std::list<t_callbackMsg> m_pendingCallbacks;
#endif // NOLAYERS

private:
	BOOL GetPeerName( SOCKADDR* lpSockAddr, int* lpSockAddrLen );
	BOOL GetSockName( SOCKADDR* lpSockAddr, int* lpSockAddrLen );
};

#ifndef NOLAYERS
#define LAYERCALLBACK_STATECHANGE 0
#define LAYERCALLBACK_LAYERSPECIFIC 1
#endif //NOLAYERS

enum SocketState
{
	notsock,
	unconnected,
	connecting,
	listening,
	connected,
	closed,
	aborted,
	attached
};

#ifdef _UNICODE
#define _sntprintf _snwprintf
#else
#define _sntprintf _snprintf
#endif

inline TCHAR* Inet6AddrToString(in6_addr& addr)
{
	LPTSTR buf = new TCHAR[512];

_sntprintf(buf, 512, _T("%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x"),
			 addr.s6_bytes[0], addr.s6_bytes[1], addr.s6_bytes[2], addr.s6_bytes[3],
			 addr.s6_bytes[4], addr.s6_bytes[5], addr.s6_bytes[6], addr.s6_bytes[7],
			 addr.s6_bytes[8], addr.s6_bytes[9], addr.s6_bytes[10], addr.s6_bytes[11],
			 addr.s6_bytes[12], addr.s6_bytes[13], addr.s6_bytes[14], addr.s6_bytes[15]);

return buf ;
}

#endif // !defined(AFX_ASYNCSOCKETEX_H__AA9E4531_63B1_442F_9A71_09B2FEEDF34E__INCLUDED_)

${this.title}

Code Editor : AsyncSocketEx.h