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。
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#!/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 sysimport socketfrom 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() |
