网络数据抓包 socket编程

GG_wang 2013-04-18 09:44:46

为什么到recv处就停止了呢？？？

代码：

#include "sockheader.h"

#include <string.h>



//#define SIO_RCVALL _WSAIOW(IOC_VENDOR,1)

#define BUFFER_MAX 23*1024



bool flag=true;

int main()

{

	WSADATA data;

	DWORD dwValue=0;

	WSAStartup( MAKEWORD( 2,2 ), &data );

	SOCKET sock,sock1 ;

	PIP_HEADER ip =(PIP_HEADER)malloc(sizeof(IP_HEADER));

	PTCP_HEADER tcp = (PTCP_HEADER)malloc(sizeof(TCP_HEADER));

	char name[128];

	char RecvBuf[BUFFER_MAX];



	sock = socket(AF_INET, SOCK_STREAM, IPPROTO_IP);



	if(SOCKET_ERROR==sock)

	{

		printf("create socket error\n");

		//exit(0);

	}

	gethostname(name,strlen(name));

	printf("%s\n",name);

	struct hostent *pHostent;

	struct sockaddr_in myaddr;

	memset((void *)&myaddr,0,sizeof(myaddr));

	pHostent = gethostbyname(name);

	myaddr.sin_addr = *(struct in_addr*)pHostent->h_addr_list[0];

	myaddr.sin_family = AF_INET;

	myaddr.sin_port = htons(6656);

	if(SOCKET_ERROR==setsockopt(sock,IPPROTO_IP,SO_REUSEADDR,(char*)&flag,sizeof(flag)))printf("1 %d\n",WSAGetLastError());//设置ip头操作选项

	if(SOCKET_ERROR==bind(sock,(struct sockaddr *)&myaddr,sizeof(myaddr)))printf("2 %d\n",WSAGetLastError());

	if(ioctlsocket(sock,FIONBIO,&dwValue)==SOCKET_ERROR)printf("3 %d\n",WSAGetLastError());//设置混杂模式

	//



	while (1)

	{

		if(SOCKET_ERROR==connect(sock,(struct sockaddr *)&myaddr,sizeof(myaddr))) printf("4 %d\n",WSAGetLastError());

		int ret = recv(sock, RecvBuf, BUFFER_MAX, 0);//接受原始数据包信息

		printf("5 %d\n",WSAGetLastError());

		if (ret>0)

		{

			printf("ok\n");

			ip = (PIP_HEADER)RecvBuf;

			if(ip->ProtocolType == 6) tcp = (PTCP_HEADER)(RecvBuf+ip->TotalLength);//是否使用的是TCP协议

			printf("协议：%s\r\n",GetProtocol(ip->ProtocolType));

			printf("IP源地址：%s\r\n",inet_ntoa(*(struct in_addr*)&ip->SourceIP));

			printf("IP源地址：%s\r\n",inet_ntoa(*(struct in_addr*)&ip->DestIP));

			printf("TCP源端口号：%d\r\n",tcp->SourcePort);

			printf("TCP目的端口号：%d\r\n",tcp->DestPort);

			printf("数据包长度：%d\r\n",ntohs(ip->TotalLength));

		}

	}

	WSACleanup();//解除与Socket库的绑定并且释放Socket库所占用的系统资源

	system("pause");

}



char *GetProtocol (int protocol)

{

	switch(protocol)

	{

	case IPPROTO_TCP:

		return PROTOCOL_STRING_TCP_TXT;

	case IPPROTO_UDP:

		return PROTOCOL_STRING_UDP_TXT;

	case IPPROTO_ICMP:

		return PROTOCOL_STRING_ICMP_TXT;

	default:

		return PROTOCOL_STRING_UNKNOW_TXT;

	}

}

头文件：

#include <iostream>

#include <winsock2.h>

#pragma comment (lib,"ws2_32.lib")



using namespace std;



#define PROTOCOL_STRING_ICMP_TXT "ICMP"

#define PROTOCOL_STRING_TCP_TXT  "TCP"

#define PROTOCOL_STRING_UDP_TXT "UDP"

#define PROTOCOL_STRING_UNKNOW_TXT "UNKNOW"





typedef struct _IP_HEADER {

	unsigned char VersionAndLenth;//版本信息（前四位）和头长度（后四位）

	unsigned char TypeofService;//服务类型

	unsigned short TotalLength;//数据包长度

	unsigned short Identifier;//数据包标识

	unsigned short Reserved;//保留字段

	unsigned char TTL;//生成时间

	unsigned char ProtocolType;//协议类型

	unsigned short CheckSum;//校验和

	unsigned int SourceIP;//源IP

	unsigned int DestIP;//目的IP

}IP_HEADER,*PIP_HEADER;



typedef struct _TCP_HEADER {

	unsigned short SourcePort;//源端口号

	unsigned short DestPort;//目的端口号

	unsigned int Sequence;//序列号

	unsigned int AcknowledgeNum;//确认号

	unsigned char LengthAndReserve;//前4位：TCP头长度，中6位：保留，后6位：标志位

	unsigned char Flags;//

	unsigned short Window;//窗口大小

	unsigned short CheckSum;//校验和

	unsigned short UrgentPointer;//紧急数据偏移量

}TCP_HEADER,*PTCP_HEADER;



typedef struct _UDP_HEADER {

	unsigned short SourcePort;//源端口号

	unsigned short DestPort;//目的端口号

	unsigned short Length;//数据包长度

	unsigned short CheckSum;//校验和

} UDP_HEADER ,*PUDP_HEADER;



typedef struct _ICMP_HEADER {

	unsigned char ICMPType;//类型

	unsigned char Code;//代码

	unsigned short CheckSum;//检验和

}ICMP_HEADER;



char *GetProtocol (int);