python原始套接字编程示例分享

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：