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。

#!/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：