tcp.h

使用VC++开发的很棒的上网拨号工具的程序的源码,可以选择PING,UDP,TCP/IP等等方式,功能比较全面.Using Visual C + + development of the great

// Tcp.h: interface for the CTcp class.
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_TCP_H__109B7123_703F_11D5_9C82_0010B54D784D__INCLUDED_)
#define AFX_TCP_H__109B7123_703F_11D5_9C82_0010B54D784D__INCLUDED_

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

/* Canonically-sized data */
typedef unsigned long longword;     /* 32 bits */
typedef unsigned short word;        /* 16 bits */
typedef unsigned char byte;         /*  8 bits */
typedef byte octet;                 /*  8 bits, for TCP */

#define NIL         0               /* The distinguished empty pointer */

#define in_GetVersion(ip) (((ip)->vht >> 12) & 0xf)//4位版本号
#define in_GetHdrlen(ip)  (((ip)->vht >> 8) & 0xf)//4位首部长度
#define in_GetHdrlenBytes(ip)  (((ip)->vht >> 6) & 0x3c)//？
#define in_GetTos(ip)      ((ip)->vht & 0xff)	//8位服务类型
#define in_GetTTL(ip)      ((ip)->ttlProtocol >> 8)//8位生存期
#define in_GetProtocol(ip) ((ip)->ttlProtocol & 0xff)//8位协议

//定义TCP首部中6位标志比特
#define tcp_FlagFIN     0x0001	//发端完成发送任务
#define tcp_FlagSYN     0x0002	//同步序号用来发起一个连接
#define tcp_FlagRST     0x0004	//重建连接
#define tcp_FlagPUSH    0x0008	//接收方应该尽快将这个报文段交给应用层
#define tcp_FlagACK     0x0010	//确认序号有效
#define tcp_FlagURG     0x0020	//紧急指针有效
#define tcp_FlagDO      0xF000	//？
#define tcp_GetDataOffset(tp) ((tp)->flags >> 12)//4位首部长度

/*
 * TCP states, from tcp manual.
 * Note: close-wait state is bypassed by automatically closing a connection
 *       when a FIN is received.  This is easy to undo.
 */
#define tcp_StateLISTEN  0      /* listening for connection */
#define tcp_StateSYNSENT 1      /* syn sent, active open */
#define tcp_StateSYNREC  2      /* syn received, synack+syn sent. */
#define tcp_StateESTAB   3      /* established */
#define tcp_StateFINWT1  4      /* sent FIN */
#define tcp_StateFINWT2  5      /* sent FIN, received FINACK */
/*#define tcp_StateCLOSEWT 6    /* received FIN waiting for close */
#define tcp_StateCLOSING 6      /* sent FIN, received FIN (waiting for FINACK) */
#define tcp_StateLASTACK 7      /* fin received, finack+fin sent */
#define tcp_StateTIMEWT  8      /* dally（延误） after sending final FINACK */
#define tcp_StateCLOSED  9      /* finack received */

#define tcp_MaxData 32              /* maximum bytes to buffer on output */

/* Timer definitions */
#define tcp_RETRANSMITTIME 1000     /* interval at which retransmitter is called */
#define tcp_LONGTIMEOUT 31000       /* timeout for opens */
#define tcp_TIMEOUT 10000           /* timeout during a connection */

class CTcp  
{
public:
	CTcp();
	virtual ~CTcp();
	
		/* Useful type definitions */
	typedef int (*procref)();	
	typedef short BOOL;                  /* boolean type */


	/* protocol address definitions */
	typedef longword in_HwAddress;
	//typedef word eth_HwAddress[3];

	/* The Ethernet header */
	/*typedef struct {
		eth_HwAddress   destination;
		eth_HwAddress   source;
		word            type;
	} eth_Header;*/

	/* The Internet Header: */
	typedef struct {
		word            vht;    /* version, hdrlen, tos */
		word            length;
		word            identification;
		word            frag;
		word            ttlProtocol;
		word            checksum;
		in_HwAddress    source;
		in_HwAddress    destination;
	} in_Header;

	typedef struct {
		word            srcPort;
		word            dstPort;
		longword        seqnum;
		longword        acknum;
		word            flags;
		word            window;
		word            checksum;
		word            urgentPointer;
	} tcp_Header;


	/* The TCP/UDP Pseudo Header */
	typedef struct {
		in_HwAddress    src;
		in_HwAddress    dst;
		octet           mbz;
		octet           protocol;
		word            length;
		word            checksum;
	} tcp_PseudoHeader;

	
	// TCP Socket definition
	typedef struct _tcp_socket {
		struct _tcp_socket *next;
		short           state;          /* connection state */
		procref         dataHandler;    /* called with incoming data */
		//eth_HwAddress   hisethaddr;     /* ethernet address of peer */
		in_HwAddress    hisaddr;        /* internet address of peer */
		word            myport, hisport;/* tcp ports for this connection */
		longword        acknum, seqnum; /* data ack'd and sequence num */
		int             timeout;        /* timeout, in milliseconds */
		BOOL            unhappy;        /* flag, indicates retransmitting segt's */
		word            flags;          /* tcp flags word for last packet sent */
		short           dataSize;       /* number of bytes of data to send */
		byte            data[tcp_MaxData]; /* data to send */
	} tcp_Socket;

	//extern eth_HwAddress sed_lclEthAddr;
	//extern eth_HwAddress sed_ethBcastAddr;
	//extern in_HwAddress  sin_lclINAddr;
	
	#ifdef DEBUG
 	// Primitive logging facility
		#define tcp_LOGPACKETS 1        /* log packet headers */
		word tcp_logState;
	#endif
	
	//Local IP address
	in_HwAddress sin_lclINAddr;
	// IP identification numbers
	int tcp_id;
	tcp_Socket *tcp_allsocs;

	void tcp_Init();
	void tcp_Open(tcp_Socket *s,word lport,in_HwAddress ina,word port,procref datahandler);
	void tcp_Listen(tcp_Socket *s,word port,procref datahandler,longword timeout);
	void tcp_Close(tcp_Socket *s);
	void tcp_Abort(tcp_Socket *s);
	void tcp_Retransmitter();
	void tcp_Unthread(tcp_Socket *ds);
	void  tcpapp(procref application);
	int tcp_Write(tcp_Socket *s,byte *dp,int len);
	void tcp_Flush(tcp_Socket *s);
	void tcp_Handler(in_Header *ip);
	void tcp_ProcessData(tcp_Socket *s,tcp_Header *tp,int len);
    void tcp_Send(tcp_Socket *s);
	longword checksum(word *dp,int length);
	void tcp_DumpHeader(in_Header *ip,tcp_Header *tp,char* mesg);
	void Move( byte *src, byte *dest,int numbytes );
	void writelog(CString temp);

};

#endif // !defined(AFX_TCP_H__109B7123_703F_11D5_9C82_0010B54D784D__INCLUDED_)