原始SOCKET抓包与数据分析

#include <iostream.h>
#include <winsock2.h>
#include <windows.h>
#include <ws2tcpip.h>
#include <stdio.h>

#define SIO_RCVALL _WSAIOW(IOC_VENDOR,1)
#define BUFFER_SIZE 65535
#pragma comment(lib,"ws2_32.lib")

typedef struct _TCP{ 
WORD SrcPort; // 源端口 
WORD DstPort; // 目的端口 
DWORD SeqNum; // 顺序号 
DWORD AckNum; // 确认号 
BYTE DataOff; // TCP头长 
BYTE Flags; // 标志（URG、ACK等） 
WORD Window; // 窗口大小 
WORD Chksum; // 校验和 
WORD UrgPtr; // 紧急指针 
} TCP; 
typedef TCP *LPTCP; 
typedef TCP UNALIGNED * ULPTCP; 



typedef struct _IP{ 
union{ BYTE Version; // 版本 
BYTE HdrLen; // IHL 
};