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本帖最后由 空灵静世 于 2010-05-14 08:59 编辑
代码如下:
/*
* main.c
*
* Created on: 2010-5-13
* Author: root
*/
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <libnet.h>
int main(){
int packet_size;
libnet_t *l;
libnet_ptag_t tcp_protocol_tag = 0;
libnet_ptag_t ip_protocol_tag = 0;
libnet_ptag_t ethreal_protocol_tag = 0;
u_short protocol=IPPROTO_TCP;
u_short srcport = 53718;
u_short destport = 22;
// u_char payload[255] = "";
u_long payload_size = 0;
char *device ="lo";
char error_infomation[LIBNET_ERRBUF_SIZE];
char *destination_ip_str = "127.0.0.1";
char *source_ip_str = "127.0.0.1";
// u_char hardware_source[6] = {0x01,0x02,0x03,0x04,0x05,0x07};
u_char hardware_destination[6] = {0/*0x00,0x22,0x64,0xAA,0x76,0xE1*/};
u_long destination_ip ;
u_long source_ip;
l = libnet_init(LIBNET_LINK_ADV,device,error_infomation);
destination_ip = libnet_name2addr4(l,destination_ip_str,LIBNET_DONT_RESOLVE);
source_ip = libnet_name2addr4(l,source_ip_str,LIBNET_DONT_RESOLVE);
// strcpy((char *)payload,"test");
// payload_size = strlen((char *)payload);
tcp_protocol_tag = libnet_build_tcp(srcport,destport,906167847,897503426,TH_FIN,32767,0,0,LIBNET_TCP_H+payload_size,NULL,payload_size,l,0);
ip_protocol_tag = libnet_build_ipv4(LIBNET_IPV4_H+LIBNET_TCP_H+payload_size,/*IPTOS_LOWDELAY*/0,241,
0,64,protocol,0,source_ip,destination_ip,NULL,0,
l,ip_protocol_tag);
ethreal_protocol_tag = libnet_autobuild_ethernet(hardware_destination,ETHERTYPE_IP,l);
packet_size = libnet_write(l);
libnet_destroy(l);
return 0;
}
为什么FIN没有效果,为什么 tcpdump 看到的和 正常的FIN不一样,为什么我的没有ACK字段的?以下是tcpdmp 结果:
17:15:14.600989 IP localhost.localdomain.53718 > localhost.localdomain.ssh: S 906167846:906167846(0) win 32792 <mss 16396,sackOK,timestamp 735311 0,nop,wscale 7>
17:15:14.601023 IP localhost.localdomain.ssh > localhost.localdomain.53718: S 897503405:897503405(0) ack 906167847 win 32768 <mss 16396,sackOK,timestamp 735311 735311,nop,wscale 7>
17:15:14.601043 IP localhost.localdomain.53718 > localhost.localdomain.ssh: . ack 897503406 win 257 <nop,nop,timestamp 735311 735311>
17:15:14.614033 IP localhost.localdomain.ssh > localhost.localdomain.53718: P 897503406:897503426(20) ack 906167847 win 256 <nop,nop,timestamp 735324 735311>
17:15:14.614061 IP localhost.localdomain.53718 > localhost.localdomain.ssh: . ack 897503426 win 257 <nop,nop,timestamp 735324 735324>
17:16:05.593554 IP localhost.localdomain.53718 > localhost.localdomain.ssh: F 906167846:906167846(0) win 32767
17:16:37.918979 IP localhost.localdomain.53718 > localhost.localdomain.ssh: F 906167847:906167847(0) win 32767
17:17:14.616818 IP localhost.localdomain.ssh > localhost.localdomain.53718: F 897503426:897503426(0) ack 906167847 win 256 <nop,nop,timestamp 855352 735324>
17:17:14.617022 IP localhost.localdomain.53718 > localhost.localdomain.ssh: F 906167847:906167847(0) ack 897503427 win 257 <nop,nop,timestamp 855352 855352>
17:17:14.617039 IP localhost.localdomain.ssh > localhost.localdomain.53718: . ack 906167848 win 256 <nop,nop,timestamp 855352 855352> |
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