在实验中需要自己构造单独的HTTP数据报文,而使用SOCK_STREAM进行发送数据包,需要进行完整的TCP交互。
因此想使用原始套接字进行编程,直接构造数据包,并在IP层进行发送,即采用SOCK_RAW进行数据发送。
使用SOCK_RAW的优势是,可以对数据包进行完整的修改,可以处理IP层上的所有数据包,对各字段进行修改,而不受UDP和TCP的限制。
下面开始构造HTTP数据包,
IP层和TCP层使用python的Impacket库,http内容自行填写。
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
#!/usr/bin/env python #------------------------------------------------------------------------------- # Name: raw_http.py # Purpose: construct a raw http get packet # # Author: Yangjun # # Created: 08/02/2014 # Copyright: (c) Yangjun 2014 # Licence: <your licence> #------------------------------------------------------------------------------- import sys import socket from impacket import ImpactDecoder, ImpactPacket def main(): if len (sys.argv) < 3 : print "Use: %s <src ip> <dst ip>" % sys.argv[ 0 ] print "Use: %s <src ip> <dst ip> <cnt>" % sys.argv[ 0 ] sys.exit( 1 ) elif len (sys.argv) = = 3 : src = sys.argv[ 1 ] dst = sys.argv[ 2 ] cnt = 1 elif len (sys.argv) = = 4 : src = sys.argv[ 1 ] dst = sys.argv[ 2 ] cnt = sys.argv[ 3 ] else : print "Input error!" sys.exit( 1 ) #print src, dst ip = ImpactPacket.IP() ip.set_ip_src(src) ip.set_ip_dst(dst) # Create a new ICMP packet of type ECHO. icmp = ImpactPacket.ICMP() tcp = ImpactPacket.TCP() tcp.set_th_sport( 55968 ) tcp.set_th_dport( 80 ) tcp.set_th_seq( 1 ) tcp.set_th_ack( 1 ) tcp.set_th_flags( 0x18 ) tcp.set_th_win( 64 ) tcp.contains( ImpactPacket.Data( "GET /att/DIYLife/41264/528 HTTP/1.1\r\nHost: 192.168.111.1\r\nAccept-Encoding: identity\r\n\r\n" )) ip.contains(tcp) # Open a raw socket. Special permissions are usually required. s = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_TCP) s.setsockopt(socket.IPPROTO_IP, socket.IP_HDRINCL, 1 ) seq_id = 0 while cnt > = 1 : # Calculate its checksum. seq_id = seq_id + 1 tcp.set_th_seq(seq_id) tcp.calculate_checksum() # Send it to the target host. s.sendto(ip.get_packet(), (dst, 80 )) cnt = cnt - 1 if __name__ = = ‘__main__‘ : main() |
运行后抓包如下: