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标题: vc++实现网路嗅探 [打印本页]

作者: 大灰狼 时间: 2014-7-24 08:35
标题: vc++实现网路嗅探

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

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

#define SIO_RCVALL _WSAIOW(IOC_VENDOR,1)

struct IPHEAD
{
unsigned char h_len:4;//4位首部长度+4位IP版本号
unsigned char ver:4;
unsigned char tos;//8位服务类型TOS
unsigned short total_len;//16位总长度（字节）
unsigned short ident;//16位标识
unsigned short frag_and_flags;//3位标志位
unsigned char ttl;//8位生存时间 TTL
unsigned char proto;//8位协议 (TCP, UDP 或其他)
unsigned short checksum;//16位IP首部校验和
unsigned int sourceip;//32位源IP地址
unsigned int destip;//32位目的IP地址
};

struct TCPHEAD //定义TCP首部
{
USHORT th_sport; //16位源端口
USHORT th_dport; //16位目的端口
unsigned int th_seq; //32位序列号
unsigned int th_ack; //32位确认号
unsigned char th_lenres; //4位首部长度/6位保留字
unsigned char th_flag; //6位标志位
USHORT th_win; //16位窗口大小
USHORT th_sum; //16位校验和
USHORT th_urp; //16位紧急数据偏移量
};

char *phostlist[10];//列举主机网卡的数组

DWORD _stdcall listen(void *p)
{
SOCKET s;
struct sockaddr_in addr;
int itimeout=1000;
int ret;
char cbuf[1500];//接收数据缓冲区
struct IPHEAD *piphd;//定义IP头结构
struct TCPHEAD *ptcphd;//定义TCP头结构

s=socket(AF_INET,SOCK_RAW,IPPROTO_RAW); //创建一个原始套接字
setsockopt(s,SOL_SOCKET,SO_RCVTIMEO,(char*)&itimeout,sizeof(itimeout));

memset(&addr,0,sizeof(addr));
addr.sin_family=AF_INET;
addr.sin_addr.S_un.S_addr=inet_addr((char *)p);
addr.sin_port=htons(6000);//设置本地端口号
bind(s,(struct sockaddr *)&addr,sizeof(addr));//绑定端口
//设置sock_raw为sio_rcvall,以便接收所有IP包
DWORD dwin=1;
DWORD dwout[10];
DWORD dwret;
WSAIoctl(s,SIO_RCVALL,&dwin,sizeof(dwin),&dwout,sizeof(dwout),&dwret,NULL,NULL);

for(;;)
{
      ret=recv(s,cbuf,sizeof(cbuf),0);//接收数据
      if(ret==SOCKET_ERROR)
      {
         if(WSAGetLastError()==WSAETIMEDOUT)continue;
         closesocket(s);
         return 0;
      }

      piphd=(struct IPHEAD *)cbuf;//取得IP头数据的地址
  int iIphLen = sizeof(unsigned long) * (piphd->h_len  & 0xf);
  ptcphd=(struct TCPHEAD *)(cbuf+iIphLen);//取得TCP头数据的地址

      printf("From : %s /t port %d/t",inet_ntoa(*(struct in_addr*)&piphd->sourceip),ntohs(ptcphd->th_sport) );
      printf("To : %s /t port %d  ",inet_ntoa(*(struct in_addr*)&piphd->destip),ntohs(ptcphd->th_dport));

      switch(piphd->proto)//根据IP头的协议判断数据包协议类型
      {
      case 1:
         printf("ICMP/n");
         break;
      case 2:
         printf("IGMP/n");
         break;
      case 6:
         printf("TCP/n");
         break;
      case 17:
         printf("UDP/n");
         break;
      default:
         printf("unknow:%d/n",piphd->proto);
      }
}

return 1;
}

void main()
{
//初始化sock
WSADATA wsa;
int i=0;
DWORD dwtid;
char chname[128];
hostent *host;

WSAStartup(MAKEWORD(2,1),&wsa);
gethostname(chname,sizeof(chname));
host=gethostbyname(chname);
while(host->h_addr_list!=NULL)//取所有网卡序号，为每个网卡开启一个监听线程
{
      phostlist=(char *)malloc(16);
      sprintf(phostlist,"%s",inet_ntoa(*(struct in_addr *)host->h_addr_list));
      printf("Bind to %s/n",phostlist);
      CreateThread(NULL,0,listen,phostlist,0,&dwtid);
      i++;
}

for(;;)//为每个网卡创建监听线程后要用一个循环防止主线程退出
{
Sleep(10);
}
}