icmp.h

Visual+C++网络通信协议分析

//																				//
//			Sets rcvSockAddr fields appropriately.								//
//																				//
//			Sets icmpSocketError and icmpSocketErrorMod to indicate the type	//
//			of error, and returns the integer result of the operation.			//
//																				//
//			icmpSocketError and icmpSocketErrorMod are preserved until the next	//
//			operation on this Icmp object is performed.							//
//																				//
//		DisplayError															//
//			Displays the provided ErrorType message prior to the decoded error	//
//			message in icmpSocketError and icmpSocketErrorMod.					//
//																				//
//			Sets the message box title to FunctionName.							//
//																				//
//			The message is displayed in a modal box, requiring an OK response	//
//			before the thread containing this method can progress.				//
//																				//
//////////////////////////////////////////////////////////////////////////////////
//																				//
//		Useage:																	//
//			To use this class, copy the files Icmp.cpp, Icmp.h and Icmp.rc		//
//			to the same directory as your project.	Include Icmp.cpp and		//
//			Icmp.rc in your	project.  This will cause an error notification		//
//			that only one .rc file can be active...ignore it, the next step		//
//			will fix it.  Open the file Icmp.rc, select the string table, and	//
//			highlight all of the messages.  Copy the resource strings to the	//
//			clipboard (copy button).  Open the projects' string table and paste	//
//		    the strings into the next available slot (paste button).  Close		//
//			both string tables and remove (delete) the file Icmp.rc from your	//
//			project.															//
//																				//
//////////////////////////////////////////////////////////////////////////////////

#pragma pack (4)

//////////////////////////////////////////////////////////////////
//																//
//																//
//////////////////////////////////////////////////////////////////

#define MAXBFRSIZE		2048

#define MAX_HOPS		30

typedef SOCKET * LPSOCKET;

typedef in_addr * LPINADDR;

//////////////////////////////////////////////////////////////////
//																//
//							IP Header							//
//				Implementation of RFC791 IP Header				//
//																//
//////////////////////////////////////////////////////////////////

typedef struct _IpHeader 
{
	unsigned int		HeaderLength:4;		// IP首部长度
	unsigned int		Version:4;			// IP的版本
	unsigned char		TypeOfService;		// 服务类型
	unsigned short		TotalLength;		// 总的数据包大小
	unsigned short		Identification;		// 特殊标识符
	unsigned short		FragmentationFlags; // 标志
	unsigned char		TTL;				// Time To Live
	unsigned char		Protocol;           // 协议 (TCP, UDP等)
	unsigned short		CheckSum;			// 检验和
	unsigned int		sourceIPAddress;	// 源地址
	unsigned int		destIPAddress;		// 目标地址

} IpHeader;

typedef IpHeader FAR * LPIpHeader;

#define IpHeaderLength sizeof(IpHeader)

//////////////////////////////////////////////////////////////////
//																//
//						ICMP header								//
//			Implementation of RFC792 ICMP Header				//
//																//
//////////////////////////////////////////////////////////////////
typedef struct _IcmpHeader
{
  BYTE			IcmpType;			//ICMP报文类型
  BYTE			IcmpCode;			//ICMP代码 
  USHORT		IcmpChecksum;		//检验和
  USHORT		IcmpId;				//标识符
  USHORT		IcmpSeq;			//序列号
  ULONG			IcmpTimestamp;		// 时间戳，非标准字段
} IcmpHeader;

typedef IcmpHeader FAR * LPIcmpHeader;

#define IcmpHeaderLength sizeof(IcmpHeader)

//////////////////////////////////////////////////////////////////

#define MAX_PACKET			2000 + IcmpHeaderLength

#define ICMP_ECHO			8
#define ICMP_ECHOREPLY		0

#define ICMP_MIN			8 // minimum 8 byte icmp packet (just header)

/////////////////////////////////////////////////////////////////////////////
// CIcmp command target

class CIcmp : public CSocket
{
// Attributes
public:

	BOOL OpenNewSocket(HWND hWnd, unsigned int NotificationMessage, long NotifyEvents);
	BOOL OpenNewSocket(HWND hWnd, unsigned int NotificationMessage, long NotifyEvents, int AFamily, int AType, int AProtocol);

	int CloseIcmpSocket(void);

	BOOL Connect(int ReceiveTimeout, int SendTimeout);
	BOOL Connect(LPINT ReceiveTimeout, LPINT SendTimeout, int AFamily, int AType, int AProtocol);

	int SetTTL(int TTL);
	
	int SetAsynchNotification(HWND hWnd, unsigned int Message, long Events);
	
	int Receive(LPSTR pIcmpBuffer, int IcmpBufferSize);

	unsigned long GetIPAddress (LPSTR iHostName);
	
	int Ping (LPSTR pIcmpBuffer, int IcmpBufferSize);

	unsigned short IcmpChecksum(unsigned short FAR *lpBuf, int Len);

	void DisplayError(CString ErrorType, CString FunctionName);
	
// Operations
public:
	CIcmp(void);
	CIcmp(CIcmp &copy);
	~CIcmp(void);

//	CIcmp(CIcmp NewIcmp);

// Overrides
public:
private:

public:
	//
	//		I/O Buffer Pointers
	//

	LPIcmpHeader		pIcmpHeader;
	LPIpHeader			pIpHeader;

	SOCKET				icmpSocket;

	SOCKADDR_IN			icmpSockAddr;
	SOCKADDR_IN			rcvSockAddr;

	DWORD				icmpRoundTripTime;

	DWORD				icmpPingSentAt;
	DWORD				icmpPingReceivedAt;

	int					icmpRcvLen;

	int					icmpHops;
	int					icmpMaxHops;

	int					icmpCurSeq;
	int					icmpCurId;
	
	int					icmpPingTimer;
	
	int					icmpSocketError;
	int					icmpSocketErrorMod;
	
	unsigned long		icmpHostAddress;

protected:
};

typedef CIcmp FAR * LPIcmp;

/////////////////////////////////////////////////////////////////////////////