1、首先打开VC++6.0
2、选择文件，新建
3、选择C++ source file 新建一个空白文档
4、声明头文件，和常量
#include <stdio.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
#include <arpa/inet.h>
#define ETH_P_ARP 0x0806
#define MAX_PACK_LEN 2000
#define ETHER_HEADER_LEN 14
#define ARPREQUEST 1
#define ARPREPLY 2
5、声明一个结构体
struct arp_struct {/*定义一个arp帧结构*/
u_char dst_mac[6];
u_char src_mac[6];
u_short pkt_type;
u_short hw_type;
u_short pro_type;
u_char hw_len;
u_char pro_len;
u_short arp_op;
u_char sender_eth[6];
u_char sender_ip[4];
u_char target_eth[6];
u_char target_ip[4];
};
6、union {
u_char full_packet[MAX_PACK_LEN];
struct arp_struct arp_pkt;
}arp;
char * GetMacAddr (u_char * s);
7、主函数
void main (int argc, char **argv)
{
int rec;
int len, from_len, rsflags;
struct ifreq if_data;
struct sockaddr from;
u_int8_t MAC[6];
u_int32_t IP, NETMASK, BROADCAST, ip, dip, sip;
if (argc != 2)
{
fprintf(stderr,"Usage: %s eth0\\n", argv[0]);
exit (0);
}
if ((rec = socket (AF_INET, SOCK_PACKET, htons(ETH_P_ARP))) < 0)
{
exit (0);
}
strcpy (if_data.ifr_name, argv[1]);
/*获取本机的一些网卡信息*/
if (ioctl (rec, SIOCGIFHWADDR, &if_data) < 0) {
exit(1);
}
memcpy (MAC, if_data.ifr_hwaddr.sa_data, 6);
printf ("> My HW Addr: %s\\n", GetMacAddr (MAC));
if (ioctl (rec, SIOCGIFADDR, &if_data) < 0) {
exit(1);
}
memcpy ((void *) &ip, (void *) &if_data.ifr_addr.sa_data + 2, 4);
IP = ntohl (ip);
printf ("> My IP Addr: %s\\n", inetaddr(ip));
if (ioctl (rec, SIOCGIFNETMASK, &if_data) < 0)
perr ("can't get NETMASK addres of my interface!\\n");
memcpy ((void *) &ip, (void *)
&if_data.ifr_netmask.sa_data + 2, 4);
NETMASK = ntohl (ip);
printf ("> My NETMASK: %s\\n", inetaddr(ip));
if (ioctl (rec, SIOCGIFBRDADDR, &if_data) < 0)
perr ("can't get BROADCAST addres of my interface!\\n");
memcpy ((void *) &ip, (void *)&if_data.ifr_broadaddr.sa_data + 2, 4);
BROADCAST = ntohl (ip);
printf ("> My BROADCAST: %s\\n", inetaddr(ip));
if ((rsflags = fcntl (rec, F_GETFL)) == -1)
{
perror ("fcntl F_GETFL");
exit (1);
}
if (fcntl (rec, F_SETFL, rsflags | O_NONBLOCK) == -1)
{
perror ("fcntl F_SETFL");
exit (1);
}
/*检测运行Sniffer程序的计算机*/
printf ("> Scanning ....\\n");
for (dip = (IP & NETMASK) + 1; dip < BROADCAST;dip++)
{
bzero(arp.full_packet, MAX_PACK_LEN);
memcpy (arp.arp_pkt.dst_mac, "\\255\\255\\255\\255\\255\\0", 6); /*ff:ff:ff:ff:ff:00*//* Only change this line! */
memcpy (arp.arp_pkt.src_mac, MAC, 6);
arp.arp_pkt.pkt_type = htons( ETH_P_ARP );/*填充发送的试探帧*/
arp.arp_pkt.hw_type = htons( 0x0001 );
arp.arp_pkt.hw_len = 6;
arp.arp_pkt.pro_type = htons( 0x0800 );
arp.arp_pkt.pro_len = 4;
arp.arp_pkt.arp_op = htons (ARPREQUEST);
memcpy (arp.arp_pkt.sender_eth, MAC, 6);
ip = htonl (IP);
memcpy (arp.arp_pkt.sender_ip, &ip, 4);
memcpy (arp.arp_pkt.target_eth, "\\0\\0\\0\\0\\0\\0", 6);
ip = htonl (dip);
memcpy (arp.arp_pkt.target_ip, &ip, 4);
strcpy(from.sa_data, argv[1]);
from.sa_family = 1;
if( sendto (rec, arp.full_packet, sizeof (struct arp_struct), 0, &from, sizeof(from)) < 0)
perror ("sendto");
usleep (50);
/*如果有恢复证明该主机的网卡处于混乱模式*/
len = recvfrom (rec, arp.full_packet, MAX_PACK_LEN, 0, &from, &from_len);
if (len <= ETHER_HEADER_LEN)
continue;
memcpy (&ip, arp.arp_pkt.target_ip, 4);
memcpy (&sip, arp.arp_pkt.sender_ip, 4);
/*获取网卡处于混乱模式主机信息*/
if (ntohs (arp.arp_pkt.arp_op) == ARPREPLY && ntohl (ip) == IP && ( dip - ntohl(sip) >= 0 ) && ( dip - ntohl(sip) <= 2 ) )
{
printf ("*> Host %s, %s **** Promiscuous mode detected !!!\n", inetaddr (sip), GetMacAddr (arp_pkt.sender_eth));
}
}
printf ("> End.\\n");
exit (0);
}
char * GetMacAddr (u_char * s)
{
static char buf[30];/*转换MAC地址*/
sprintf (buf, "%02X:%02X:%02X:%02X:%02X:%02X", s[0], s[1], s[2], s[3], s[4], s[5]);
return buf;
}
